id stringlengths 24 24 | title stringlengths 3 59 | context stringlengths 151 3.71k | question stringlengths 12 217 | answers dict |
|---|---|---|---|---|
56e0d4e1231d4119001ac40b | Web_browser | Most web browsers can display a list of web pages that the user has bookmarked so that the user can quickly return to them. Bookmarks are also called "Favorites" in Internet Explorer. In addition, all major web browsers have some form of built-in web feed aggregator. In Firefox, web feeds are formatted as "live bookmar... | Firefox does web feeds as what? | {
"text": [
"live bookmarks"
],
"answer_start": [
308
]
} |
56e0d4e1231d4119001ac40c | Web_browser | Most web browsers can display a list of web pages that the user has bookmarked so that the user can quickly return to them. Bookmarks are also called "Favorites" in Internet Explorer. In addition, all major web browsers have some form of built-in web feed aggregator. In Firefox, web feeds are formatted as "live bookmar... | The Opera feed reader is more what? | {
"text": [
"traditional"
],
"answer_start": [
424
]
} |
56e0d5117aa994140058e763 | Web_browser | Most browsers support HTTP Secure and offer quick and easy ways to delete the web cache, download history, form and search history, cookies, and browsing history. For a comparison of the current security vulnerabilities of browsers, see comparison of web browsers. | HTTP Secure is supported by what? | {
"text": [
"Most browsers"
],
"answer_start": [
0
]
} |
56e0d5117aa994140058e764 | Web_browser | Most browsers support HTTP Secure and offer quick and easy ways to delete the web cache, download history, form and search history, cookies, and browsing history. For a comparison of the current security vulnerabilities of browsers, see comparison of web browsers. | Cache, download history, cookies, browsing and what else can be quickly deleted in browsers? | {
"text": [
"form and search history"
],
"answer_start": [
107
]
} |
56e0d5117aa994140058e765 | Web_browser | Most browsers support HTTP Secure and offer quick and easy ways to delete the web cache, download history, form and search history, cookies, and browsing history. For a comparison of the current security vulnerabilities of browsers, see comparison of web browsers. | A comparison of browser must be seen to know what? | {
"text": [
"current security vulnerabilities"
],
"answer_start": [
187
]
} |
56e0d561231d4119001ac413 | Web_browser | Early web browsers supported only a very simple version of HTML. The rapid development of proprietary web browsers led to the development of non-standard dialects of HTML, leading to problems with interoperability. Modern web browsers support a combination of standards-based and de facto HTML and XHTML, which should be... | Quick development of what kind of browsers led to non-standard HTML dialects? | {
"text": [
"proprietary web browsers"
],
"answer_start": [
90
]
} |
56e0d561231d4119001ac414 | Web_browser | Early web browsers supported only a very simple version of HTML. The rapid development of proprietary web browsers led to the development of non-standard dialects of HTML, leading to problems with interoperability. Modern web browsers support a combination of standards-based and de facto HTML and XHTML, which should be... | Non-standard dialects led to what? | {
"text": [
"problems with interoperability"
],
"answer_start": [
183
]
} |
56e0d561231d4119001ac415 | Web_browser | Early web browsers supported only a very simple version of HTML. The rapid development of proprietary web browsers led to the development of non-standard dialects of HTML, leading to problems with interoperability. Modern web browsers support a combination of standards-based and de facto HTML and XHTML, which should be... | Modern browser support standards-based and defacto what? | {
"text": [
"HTML and XHTML"
],
"answer_start": [
289
]
} |
56e0d561231d4119001ac416 | Web_browser | Early web browsers supported only a very simple version of HTML. The rapid development of proprietary web browsers led to the development of non-standard dialects of HTML, leading to problems with interoperability. Modern web browsers support a combination of standards-based and de facto HTML and XHTML, which should be... | HTML and XHTML should be what by all browsers? | {
"text": [
"rendered in the same way"
],
"answer_start": [
321
]
} |
56e0d5d6231d4119001ac41c | Web_browser | Web browsers consist of a user interface, layout engine, rendering engine, JavaScript interpreter, UI backend, networking component and data persistence component. These components achieve different functionalities of a web browser and together provide all capabilities of a web browser. | A user interface, UI backend, layout engine and other things are part of what? | {
"text": [
"Web browsers"
],
"answer_start": [
0
]
} |
56e0d5d6231d4119001ac41d | Web_browser | Web browsers consist of a user interface, layout engine, rendering engine, JavaScript interpreter, UI backend, networking component and data persistence component. These components achieve different functionalities of a web browser and together provide all capabilities of a web browser. | The layout engine, rendering engine, user interface and other things are components that offer different what of web browsers? | {
"text": [
"functionalities"
],
"answer_start": [
199
]
} |
56e0ebae7aa994140058e7cb | BeiDou_Navigation_Satellite_System | The BeiDou Navigation Satellite System (BDS, simplified Chinese: 北斗卫星导航系统; traditional Chinese: 北斗衛星導航系統; pinyin: Běidǒu wèixīng dǎoháng xìtǒng) is a Chinese satellite navigation system. It consists of two separate satellite constellations – a limited test system that has been operating since 2000, and a full-scale glo... | What is the BeiDou Navigation Satellite System? | {
"text": [
"a Chinese satellite navigation system"
],
"answer_start": [
148
]
} |
56e0ebae7aa994140058e7cc | BeiDou_Navigation_Satellite_System | The BeiDou Navigation Satellite System (BDS, simplified Chinese: 北斗卫星导航系统; traditional Chinese: 北斗衛星導航系統; pinyin: Běidǒu wèixīng dǎoháng xìtǒng) is a Chinese satellite navigation system. It consists of two separate satellite constellations – a limited test system that has been operating since 2000, and a full-scale glo... | How many satellite constellations does the BeiDou Navigation Satellite System have? | {
"text": [
"two separate satellite constellations"
],
"answer_start": [
202
]
} |
56e0ebae7aa994140058e7ce | BeiDou_Navigation_Satellite_System | The BeiDou Navigation Satellite System (BDS, simplified Chinese: 北斗卫星导航系统; traditional Chinese: 北斗衛星導航系統; pinyin: Běidǒu wèixīng dǎoháng xìtǒng) is a Chinese satellite navigation system. It consists of two separate satellite constellations – a limited test system that has been operating since 2000, and a full-scale glo... | How long has the limited test system been operating? | {
"text": [
"since 2000"
],
"answer_start": [
288
]
} |
56e0ebae7aa994140058e7cf | BeiDou_Navigation_Satellite_System | The BeiDou Navigation Satellite System (BDS, simplified Chinese: 北斗卫星导航系统; traditional Chinese: 北斗衛星導航系統; pinyin: Běidǒu wèixīng dǎoháng xìtǒng) is a Chinese satellite navigation system. It consists of two separate satellite constellations – a limited test system that has been operating since 2000, and a full-scale glo... | How is the BeiDou Navigation Satellite System written in traditional Chinese? | {
"text": [
"北斗衛星導航系統"
],
"answer_start": [
96
]
} |
56e0ec76231d4119001ac44e | BeiDou_Navigation_Satellite_System | The first BeiDou system, officially called the BeiDou Satellite Navigation Experimental System (simplified Chinese: 北斗卫星导航试验系统; traditional Chinese: 北斗衛星導航試驗系統; pinyin: Běidǒu wèixīng dǎoháng shìyàn xìtǒng) and also known as BeiDou-1, consists of three satellites and offers limited coverage and applications. It has bee... | What was the first BeiDou system called? | {
"text": [
"the BeiDou Satellite Navigation Experimental System"
],
"answer_start": [
43
]
} |
56e0ec76231d4119001ac44f | BeiDou_Navigation_Satellite_System | The first BeiDou system, officially called the BeiDou Satellite Navigation Experimental System (simplified Chinese: 北斗卫星导航试验系统; traditional Chinese: 北斗衛星導航試驗系統; pinyin: Běidǒu wèixīng dǎoháng shìyàn xìtǒng) and also known as BeiDou-1, consists of three satellites and offers limited coverage and applications. It has bee... | Who does the BeiDou-1 operate for? | {
"text": [
"mainly for customers in China and neighboring regions"
],
"answer_start": [
352
]
} |
56e0ec76231d4119001ac450 | BeiDou_Navigation_Satellite_System | The first BeiDou system, officially called the BeiDou Satellite Navigation Experimental System (simplified Chinese: 北斗卫星导航试验系统; traditional Chinese: 北斗衛星導航試驗系統; pinyin: Běidǒu wèixīng dǎoháng shìyàn xìtǒng) and also known as BeiDou-1, consists of three satellites and offers limited coverage and applications. It has bee... | What is another name for the BeiDou Satellite Navigation Experimental System? | {
"text": [
"BeiDou-1"
],
"answer_start": [
225
]
} |
56e0ec76231d4119001ac451 | BeiDou_Navigation_Satellite_System | The first BeiDou system, officially called the BeiDou Satellite Navigation Experimental System (simplified Chinese: 北斗卫星导航试验系统; traditional Chinese: 北斗衛星導航試驗系統; pinyin: Běidǒu wèixīng dǎoháng shìyàn xìtǒng) and also known as BeiDou-1, consists of three satellites and offers limited coverage and applications. It has bee... | How many satellites does the BeiDou-1 have? | {
"text": [
"three"
],
"answer_start": [
247
]
} |
56e0ec76231d4119001ac452 | BeiDou_Navigation_Satellite_System | The first BeiDou system, officially called the BeiDou Satellite Navigation Experimental System (simplified Chinese: 北斗卫星导航试验系统; traditional Chinese: 北斗衛星導航試驗系統; pinyin: Běidǒu wèixīng dǎoháng shìyàn xìtǒng) and also known as BeiDou-1, consists of three satellites and offers limited coverage and applications. It has bee... | How long has the BeiDou-1 been operating? | {
"text": [
"since 2000"
],
"answer_start": [
407
]
} |
56e0f1b0231d4119001ac48a | BeiDou_Navigation_Satellite_System | The second generation of the system, officially called the BeiDou Navigation Satellite System (BDS) and also known as COMPASS or BeiDou-2, will be a global satellite navigation system consisting of 35 satellites, and is under construction as of January 2015[update]. It became operational in China in December 2011, with... | What is the name of the second generation of BDS? | {
"text": [
"BeiDou Navigation Satellite System"
],
"answer_start": [
59
]
} |
56e0f1b0231d4119001ac48b | BeiDou_Navigation_Satellite_System | The second generation of the system, officially called the BeiDou Navigation Satellite System (BDS) and also known as COMPASS or BeiDou-2, will be a global satellite navigation system consisting of 35 satellites, and is under construction as of January 2015[update]. It became operational in China in December 2011, with... | What is another name for the BeiDou Navigation Satellite System? | {
"text": [
"COMPASS or BeiDou-2"
],
"answer_start": [
118
]
} |
56e0f1b0231d4119001ac48c | BeiDou_Navigation_Satellite_System | The second generation of the system, officially called the BeiDou Navigation Satellite System (BDS) and also known as COMPASS or BeiDou-2, will be a global satellite navigation system consisting of 35 satellites, and is under construction as of January 2015[update]. It became operational in China in December 2011, with... | How many satellites will the BeiDou-2 have? | {
"text": [
"35"
],
"answer_start": [
198
]
} |
56e0f1b0231d4119001ac48d | BeiDou_Navigation_Satellite_System | The second generation of the system, officially called the BeiDou Navigation Satellite System (BDS) and also known as COMPASS or BeiDou-2, will be a global satellite navigation system consisting of 35 satellites, and is under construction as of January 2015[update]. It became operational in China in December 2011, with... | When did the BeiDou-2 begin construction? | {
"text": [
"January 2015"
],
"answer_start": [
245
]
} |
56e0f1b0231d4119001ac48e | BeiDou_Navigation_Satellite_System | The second generation of the system, officially called the BeiDou Navigation Satellite System (BDS) and also known as COMPASS or BeiDou-2, will be a global satellite navigation system consisting of 35 satellites, and is under construction as of January 2015[update]. It became operational in China in December 2011, with... | When did the BeiDou-2 begin operating? | {
"text": [
"December 2011"
],
"answer_start": [
301
]
} |
56e0f2db231d4119001ac4c0 | BeiDou_Navigation_Satellite_System | In-mid 2015, China started the build-up of the third generation BeiDou system (BDS-3) in the global coverage constellation. The first BDS-3 satellite was launched 30 September 2015. As of March 2016, 4 BDS-3 in-orbit validation satellites have been launched. | When did China begin constructing the third BeiDou system? | {
"text": [
"mid 2015"
],
"answer_start": [
3
]
} |
56e0f2db231d4119001ac4c1 | BeiDou_Navigation_Satellite_System | In-mid 2015, China started the build-up of the third generation BeiDou system (BDS-3) in the global coverage constellation. The first BDS-3 satellite was launched 30 September 2015. As of March 2016, 4 BDS-3 in-orbit validation satellites have been launched. | What is the third BeiDou system called? | {
"text": [
"BDS-3"
],
"answer_start": [
79
]
} |
56e0f2db231d4119001ac4c2 | BeiDou_Navigation_Satellite_System | In-mid 2015, China started the build-up of the third generation BeiDou system (BDS-3) in the global coverage constellation. The first BDS-3 satellite was launched 30 September 2015. As of March 2016, 4 BDS-3 in-orbit validation satellites have been launched. | When was the first BDS-3 satellite launched? | {
"text": [
"30 September 2015"
],
"answer_start": [
163
]
} |
56e0f2db231d4119001ac4c3 | BeiDou_Navigation_Satellite_System | In-mid 2015, China started the build-up of the third generation BeiDou system (BDS-3) in the global coverage constellation. The first BDS-3 satellite was launched 30 September 2015. As of March 2016, 4 BDS-3 in-orbit validation satellites have been launched. | How many BDS-3 satellites have been launched? | {
"text": [
"4"
],
"answer_start": [
200
]
} |
56e0fb457aa994140058e863 | BeiDou_Navigation_Satellite_System | According to China daily. Fifteen years after the satellite system was launched, it is now generating $31.5 billion for major companies such as China Aerospace Science and Industry Corp, AutoNavi Holdings Ltd, and China North Industries Group Corp. | How long ago was the BeiDou Satellite System first launched? | {
"text": [
"Fifteen years"
],
"answer_start": [
26
]
} |
56e0fb457aa994140058e864 | BeiDou_Navigation_Satellite_System | According to China daily. Fifteen years after the satellite system was launched, it is now generating $31.5 billion for major companies such as China Aerospace Science and Industry Corp, AutoNavi Holdings Ltd, and China North Industries Group Corp. | How much revenue for companies is generated by the BDS system? | {
"text": [
"$31.5 billion"
],
"answer_start": [
102
]
} |
56e0fca4231d4119001ac53e | BeiDou_Navigation_Satellite_System | The official English name of the system is BeiDou Navigation Satellite System. It is named after the Big Dipper constellation, which is known in Chinese as Běidǒu. The name literally means "Northern Dipper", the name given by ancient Chinese astronomers to the seven brightest stars of the Ursa Major constellation. Hist... | What is the BeiDou Navigation Satellite System named after? | {
"text": [
"the Big Dipper constellation"
],
"answer_start": [
97
]
} |
56e0fca4231d4119001ac53f | BeiDou_Navigation_Satellite_System | The official English name of the system is BeiDou Navigation Satellite System. It is named after the Big Dipper constellation, which is known in Chinese as Běidǒu. The name literally means "Northern Dipper", the name given by ancient Chinese astronomers to the seven brightest stars of the Ursa Major constellation. Hist... | What is the Big Dipper constellation known as in Chinese? | {
"text": [
"Běidǒu"
],
"answer_start": [
156
]
} |
56e0fca4231d4119001ac540 | BeiDou_Navigation_Satellite_System | The official English name of the system is BeiDou Navigation Satellite System. It is named after the Big Dipper constellation, which is known in Chinese as Běidǒu. The name literally means "Northern Dipper", the name given by ancient Chinese astronomers to the seven brightest stars of the Ursa Major constellation. Hist... | What does Běidǒu translate as? | {
"text": [
"Northern Dipper"
],
"answer_start": [
190
]
} |
56e0fca4231d4119001ac541 | BeiDou_Navigation_Satellite_System | The official English name of the system is BeiDou Navigation Satellite System. It is named after the Big Dipper constellation, which is known in Chinese as Běidǒu. The name literally means "Northern Dipper", the name given by ancient Chinese astronomers to the seven brightest stars of the Ursa Major constellation. Hist... | Who named the constellation Běidǒu? | {
"text": [
"ancient Chinese astronomers"
],
"answer_start": [
226
]
} |
56e0fca4231d4119001ac542 | BeiDou_Navigation_Satellite_System | The official English name of the system is BeiDou Navigation Satellite System. It is named after the Big Dipper constellation, which is known in Chinese as Běidǒu. The name literally means "Northern Dipper", the name given by ancient Chinese astronomers to the seven brightest stars of the Ursa Major constellation. Hist... | What was the Běidǒu constellation used for? | {
"text": [
"to locate the North Star Polaris"
],
"answer_start": [
371
]
} |
56e0fd33231d4119001ac54c | BeiDou_Navigation_Satellite_System | The original idea of a Chinese satellite navigation system was conceived by Chen Fangyun and his colleagues in the 1980s. According to the China National Space Administration, the development of the system would be carried out in three steps: | Who first came up with the idea for a Chinese satellite navigation system? | {
"text": [
"Chen Fangyun and his colleagues"
],
"answer_start": [
76
]
} |
56e0fd33231d4119001ac54d | BeiDou_Navigation_Satellite_System | The original idea of a Chinese satellite navigation system was conceived by Chen Fangyun and his colleagues in the 1980s. According to the China National Space Administration, the development of the system would be carried out in three steps: | When did Chen Fangyun come up with the idea for a satellite navigation system? | {
"text": [
"in the 1980s"
],
"answer_start": [
108
]
} |
56e0fd33231d4119001ac54e | BeiDou_Navigation_Satellite_System | The original idea of a Chinese satellite navigation system was conceived by Chen Fangyun and his colleagues in the 1980s. According to the China National Space Administration, the development of the system would be carried out in three steps: | The China National Space Administration said the satellite navigation system would be developed in how many steps? | {
"text": [
"three"
],
"answer_start": [
230
]
} |
56e0fdc8231d4119001ac558 | BeiDou_Navigation_Satellite_System | The first satellite, BeiDou-1A, was launched on 30 October 2000, followed by BeiDou-1B on 20 December 2000. The third satellite, BeiDou-1C (a backup satellite), was put into orbit on 25 May 2003. The successful launch of BeiDou-1C also meant the establishment of the BeiDou-1 navigation system. | What was the name of the first satellite launched for the system? | {
"text": [
"BeiDou-1A"
],
"answer_start": [
21
]
} |
56e0fdc8231d4119001ac559 | BeiDou_Navigation_Satellite_System | The first satellite, BeiDou-1A, was launched on 30 October 2000, followed by BeiDou-1B on 20 December 2000. The third satellite, BeiDou-1C (a backup satellite), was put into orbit on 25 May 2003. The successful launch of BeiDou-1C also meant the establishment of the BeiDou-1 navigation system. | When was BeiDou-1A launched? | {
"text": [
"20 December 2000"
],
"answer_start": [
90
]
} |
56e0fdc8231d4119001ac55a | BeiDou_Navigation_Satellite_System | The first satellite, BeiDou-1A, was launched on 30 October 2000, followed by BeiDou-1B on 20 December 2000. The third satellite, BeiDou-1C (a backup satellite), was put into orbit on 25 May 2003. The successful launch of BeiDou-1C also meant the establishment of the BeiDou-1 navigation system. | What was the name of the third satellite launched for the system? | {
"text": [
"BeiDou-1C"
],
"answer_start": [
129
]
} |
56e0fdc8231d4119001ac55b | BeiDou_Navigation_Satellite_System | The first satellite, BeiDou-1A, was launched on 30 October 2000, followed by BeiDou-1B on 20 December 2000. The third satellite, BeiDou-1C (a backup satellite), was put into orbit on 25 May 2003. The successful launch of BeiDou-1C also meant the establishment of the BeiDou-1 navigation system. | What was the purpose of launching the BeiDou-1C satellite? | {
"text": [
"a backup satellite"
],
"answer_start": [
140
]
} |
56e0fdc8231d4119001ac55c | BeiDou_Navigation_Satellite_System | The first satellite, BeiDou-1A, was launched on 30 October 2000, followed by BeiDou-1B on 20 December 2000. The third satellite, BeiDou-1C (a backup satellite), was put into orbit on 25 May 2003. The successful launch of BeiDou-1C also meant the establishment of the BeiDou-1 navigation system. | When was the BeiDou-1C satellite launched? | {
"text": [
"25 May 2003"
],
"answer_start": [
183
]
} |
56e10245e3433e1400422a96 | BeiDou_Navigation_Satellite_System | On 2 November 2006, China announced that from 2008 BeiDou would offer an open service with an accuracy of 10 meters, timing of 0.2 microseconds, and speed of 0.2 meters/second.[citation needed] | When did China announce service plans for the BeiDou system? | {
"text": [
"2 November 2006"
],
"answer_start": [
3
]
} |
56e10245e3433e1400422a97 | BeiDou_Navigation_Satellite_System | On 2 November 2006, China announced that from 2008 BeiDou would offer an open service with an accuracy of 10 meters, timing of 0.2 microseconds, and speed of 0.2 meters/second.[citation needed] | What was the accuracy range that China promised to offer in 2008 with the BeiDou system? | {
"text": [
"10 meters"
],
"answer_start": [
106
]
} |
56e10245e3433e1400422a98 | BeiDou_Navigation_Satellite_System | On 2 November 2006, China announced that from 2008 BeiDou would offer an open service with an accuracy of 10 meters, timing of 0.2 microseconds, and speed of 0.2 meters/second.[citation needed] | What was the timing and speed that China promised to offer in 2008 with the BeiDou system? | {
"text": [
"timing of 0.2 microseconds, and speed of 0.2 meters/second"
],
"answer_start": [
117
]
} |
56e1030ae3433e1400422a9c | BeiDou_Navigation_Satellite_System | In February 2007, the fourth and last satellite of the BeiDou-1 system, BeiDou-1D (sometimes called BeiDou-2A, serving as a backup satellite), was sent up into space. It was reported that the satellite had suffered from a control system malfunction but was then fully restored. | When was the fourth satellite for the BeiDou-1 system launched? | {
"text": [
"February 2007"
],
"answer_start": [
3
]
} |
56e1030ae3433e1400422a9d | BeiDou_Navigation_Satellite_System | In February 2007, the fourth and last satellite of the BeiDou-1 system, BeiDou-1D (sometimes called BeiDou-2A, serving as a backup satellite), was sent up into space. It was reported that the satellite had suffered from a control system malfunction but was then fully restored. | What is the name of the fourth BeiDou-1 satellite? | {
"text": [
"BeiDou-1D"
],
"answer_start": [
72
]
} |
56e1030ae3433e1400422a9e | BeiDou_Navigation_Satellite_System | In February 2007, the fourth and last satellite of the BeiDou-1 system, BeiDou-1D (sometimes called BeiDou-2A, serving as a backup satellite), was sent up into space. It was reported that the satellite had suffered from a control system malfunction but was then fully restored. | What is the BeiDou-1D satellite sometimes called? | {
"text": [
"BeiDou-2A"
],
"answer_start": [
100
]
} |
56e1030ae3433e1400422a9f | BeiDou_Navigation_Satellite_System | In February 2007, the fourth and last satellite of the BeiDou-1 system, BeiDou-1D (sometimes called BeiDou-2A, serving as a backup satellite), was sent up into space. It was reported that the satellite had suffered from a control system malfunction but was then fully restored. | What is the purpose of the BeiDou-1D satellite? | {
"text": [
"serving as a backup satellite"
],
"answer_start": [
111
]
} |
56e1030ae3433e1400422aa0 | BeiDou_Navigation_Satellite_System | In February 2007, the fourth and last satellite of the BeiDou-1 system, BeiDou-1D (sometimes called BeiDou-2A, serving as a backup satellite), was sent up into space. It was reported that the satellite had suffered from a control system malfunction but was then fully restored. | What happened to the BeiDou-1D satellite that needed to be repaired? | {
"text": [
"a control system malfunction"
],
"answer_start": [
220
]
} |
56e103f6e3433e1400422ab0 | BeiDou_Navigation_Satellite_System | In April 2007, the first satellite of BeiDou-2, namely Compass-M1 (to validate frequencies for the BeiDou-2 constellation) was successfully put into its working orbit. The second BeiDou-2 constellation satellite Compass-G2 was launched on 15 April 2009. On 15 January 2010, the official website of the BeiDou Navigation ... | When was the first satellite for the BeiDou-2 system launched? | {
"text": [
"April 2007"
],
"answer_start": [
3
]
} |
56e103f6e3433e1400422ab1 | BeiDou_Navigation_Satellite_System | In April 2007, the first satellite of BeiDou-2, namely Compass-M1 (to validate frequencies for the BeiDou-2 constellation) was successfully put into its working orbit. The second BeiDou-2 constellation satellite Compass-G2 was launched on 15 April 2009. On 15 January 2010, the official website of the BeiDou Navigation ... | What is the the first satellite for the BeiDou-2 system called? | {
"text": [
"Compass-M1"
],
"answer_start": [
55
]
} |
56e103f6e3433e1400422ab3 | BeiDou_Navigation_Satellite_System | In April 2007, the first satellite of BeiDou-2, namely Compass-M1 (to validate frequencies for the BeiDou-2 constellation) was successfully put into its working orbit. The second BeiDou-2 constellation satellite Compass-G2 was launched on 15 April 2009. On 15 January 2010, the official website of the BeiDou Navigation ... | When was the second satellite for the BeiDou-2 system launched? | {
"text": [
"15 April 2009"
],
"answer_start": [
239
]
} |
56e103f6e3433e1400422ab4 | BeiDou_Navigation_Satellite_System | In April 2007, the first satellite of BeiDou-2, namely Compass-M1 (to validate frequencies for the BeiDou-2 constellation) was successfully put into its working orbit. The second BeiDou-2 constellation satellite Compass-G2 was launched on 15 April 2009. On 15 January 2010, the official website of the BeiDou Navigation ... | When was the third satellite for the BeiDou-2 system launched? | {
"text": [
"17 January 2010"
],
"answer_start": [
452
]
} |
56e10514e3433e1400422ad4 | BeiDou_Navigation_Satellite_System | In September 2003, China intended to join the European Galileo positioning system project and was to invest €230 million (USD296 million, GBP160 million) in Galileo over the next few years. At the time, it was believed that China's "BeiDou" navigation system would then only be used by its armed forces. In October 2004,... | How much was China going to invest in the European Galileo positioning system project? | {
"text": [
"€230 million (USD296 million, GBP160 million)"
],
"answer_start": [
108
]
} |
56e10514e3433e1400422ad5 | BeiDou_Navigation_Satellite_System | In September 2003, China intended to join the European Galileo positioning system project and was to invest €230 million (USD296 million, GBP160 million) in Galileo over the next few years. At the time, it was believed that China's "BeiDou" navigation system would then only be used by its armed forces. In October 2004,... | In 2003, what was the planned purpose of the BeiDou navigation system? | {
"text": [
"only be used by its armed forces"
],
"answer_start": [
270
]
} |
56e10514e3433e1400422ad6 | BeiDou_Navigation_Satellite_System | In September 2003, China intended to join the European Galileo positioning system project and was to invest €230 million (USD296 million, GBP160 million) in Galileo over the next few years. At the time, it was believed that China's "BeiDou" navigation system would then only be used by its armed forces. In October 2004,... | When did China join the Galileo project? | {
"text": [
"October 2004"
],
"answer_start": [
307
]
} |
56e10514e3433e1400422ad7 | BeiDou_Navigation_Satellite_System | In September 2003, China intended to join the European Galileo positioning system project and was to invest €230 million (USD296 million, GBP160 million) in Galileo over the next few years. At the time, it was believed that China's "BeiDou" navigation system would then only be used by its armed forces. In October 2004,... | When was China Galileo Industries (CGI) founded? | {
"text": [
"December 2004"
],
"answer_start": [
722
]
} |
56e10514e3433e1400422ad8 | BeiDou_Navigation_Satellite_System | In September 2003, China intended to join the European Galileo positioning system project and was to invest €230 million (USD296 million, GBP160 million) in Galileo over the next few years. At the time, it was believed that China's "BeiDou" navigation system would then only be used by its armed forces. In October 2004,... | Who said in 2008 that China was unsatisfied with its involvement in the Galileo project? | {
"text": [
"the Hong Kong-based South China Morning Post"
],
"answer_start": [
856
]
} |
56e105afcd28a01900c67449 | BeiDou_Navigation_Satellite_System | BeiDou-1 is an experimental regional navigation system, which consists of four satellites (three working satellites and one backup satellite). The satellites themselves were based on the Chinese DFH-3 geostationary communications satellite and had a launch weight of 1,000 kilograms (2,200 pounds) each. | What is the BeiDou-1? | {
"text": [
"an experimental regional navigation system"
],
"answer_start": [
12
]
} |
56e105afcd28a01900c6744a | BeiDou_Navigation_Satellite_System | BeiDou-1 is an experimental regional navigation system, which consists of four satellites (three working satellites and one backup satellite). The satellites themselves were based on the Chinese DFH-3 geostationary communications satellite and had a launch weight of 1,000 kilograms (2,200 pounds) each. | The BeiDou-1 is made up of how may satellites? | {
"text": [
"four"
],
"answer_start": [
74
]
} |
56e105afcd28a01900c6744b | BeiDou_Navigation_Satellite_System | BeiDou-1 is an experimental regional navigation system, which consists of four satellites (three working satellites and one backup satellite). The satellites themselves were based on the Chinese DFH-3 geostationary communications satellite and had a launch weight of 1,000 kilograms (2,200 pounds) each. | How many satellites in the BeiDou-1 system is used for back up? | {
"text": [
"one"
],
"answer_start": [
120
]
} |
56e105afcd28a01900c6744c | BeiDou_Navigation_Satellite_System | BeiDou-1 is an experimental regional navigation system, which consists of four satellites (three working satellites and one backup satellite). The satellites themselves were based on the Chinese DFH-3 geostationary communications satellite and had a launch weight of 1,000 kilograms (2,200 pounds) each. | What were the BeiDou-1 system satellites based on? | {
"text": [
"the Chinese DFH-3 geostationary communications satellite"
],
"answer_start": [
183
]
} |
56e105afcd28a01900c6744d | BeiDou_Navigation_Satellite_System | BeiDou-1 is an experimental regional navigation system, which consists of four satellites (three working satellites and one backup satellite). The satellites themselves were based on the Chinese DFH-3 geostationary communications satellite and had a launch weight of 1,000 kilograms (2,200 pounds) each. | How much did each satellite for the BeiDou-1 system weigh? | {
"text": [
"1,000 kilograms (2,200 pounds) each"
],
"answer_start": [
267
]
} |
56e106b3e3433e1400422af0 | BeiDou_Navigation_Satellite_System | Unlike the American GPS, Russian GLONASS, and European Galileo systems, which use medium Earth orbit satellites, BeiDou-1 uses satellites in geostationary orbit. This means that the system does not require a large constellation of satellites, but it also limits the coverage to areas on Earth where the satellites are vi... | What type of satellites does the American GPS system use? | {
"text": [
"medium Earth orbit satellites"
],
"answer_start": [
82
]
} |
56e106b3e3433e1400422af1 | BeiDou_Navigation_Satellite_System | Unlike the American GPS, Russian GLONASS, and European Galileo systems, which use medium Earth orbit satellites, BeiDou-1 uses satellites in geostationary orbit. This means that the system does not require a large constellation of satellites, but it also limits the coverage to areas on Earth where the satellites are vi... | What type of satellites does the BeiDou-1 system use? | {
"text": [
"satellites in geostationary orbit"
],
"answer_start": [
127
]
} |
56e106b3e3433e1400422af2 | BeiDou_Navigation_Satellite_System | Unlike the American GPS, Russian GLONASS, and European Galileo systems, which use medium Earth orbit satellites, BeiDou-1 uses satellites in geostationary orbit. This means that the system does not require a large constellation of satellites, but it also limits the coverage to areas on Earth where the satellites are vi... | What is the purpose of the BeiDou-1 system using stallites in geostationary orbit? | {
"text": [
"the system does not require a large constellation of satellites"
],
"answer_start": [
178
]
} |
56e106b3e3433e1400422af4 | BeiDou_Navigation_Satellite_System | Unlike the American GPS, Russian GLONASS, and European Galileo systems, which use medium Earth orbit satellites, BeiDou-1 uses satellites in geostationary orbit. This means that the system does not require a large constellation of satellites, but it also limits the coverage to areas on Earth where the satellites are vi... | What is the frequency of the BeiDou-1 system? | {
"text": [
"2491.75 MHz"
],
"answer_start": [
449
]
} |
56e10745cd28a01900c6745f | BeiDou_Navigation_Satellite_System | The first satellite, BeiDou-1A, was launched on October 31, 2000. The second satellite, BeiDou-1B, was successfully launched on December 21, 2000. The last operational satellite of the constellation, BeiDou-1C, was launched on May 25, 2003. | When was the first satellite for the BeiDou-1 system launched? | {
"text": [
"October 31, 2000"
],
"answer_start": [
48
]
} |
56e10745cd28a01900c67460 | BeiDou_Navigation_Satellite_System | The first satellite, BeiDou-1A, was launched on October 31, 2000. The second satellite, BeiDou-1B, was successfully launched on December 21, 2000. The last operational satellite of the constellation, BeiDou-1C, was launched on May 25, 2003. | What was the first satellite for the BeiDou-1 system called? | {
"text": [
"BeiDou-1A"
],
"answer_start": [
21
]
} |
56e10745cd28a01900c67461 | BeiDou_Navigation_Satellite_System | The first satellite, BeiDou-1A, was launched on October 31, 2000. The second satellite, BeiDou-1B, was successfully launched on December 21, 2000. The last operational satellite of the constellation, BeiDou-1C, was launched on May 25, 2003. | When was the second satellite for the BeiDou-1 system launched? | {
"text": [
"December 21, 2000"
],
"answer_start": [
128
]
} |
56e10745cd28a01900c67462 | BeiDou_Navigation_Satellite_System | The first satellite, BeiDou-1A, was launched on October 31, 2000. The second satellite, BeiDou-1B, was successfully launched on December 21, 2000. The last operational satellite of the constellation, BeiDou-1C, was launched on May 25, 2003. | What was the second satellite for the BeiDou-1 system called? | {
"text": [
"BeiDou-1B"
],
"answer_start": [
88
]
} |
56e10745cd28a01900c67463 | BeiDou_Navigation_Satellite_System | The first satellite, BeiDou-1A, was launched on October 31, 2000. The second satellite, BeiDou-1B, was successfully launched on December 21, 2000. The last operational satellite of the constellation, BeiDou-1C, was launched on May 25, 2003. | When was the last satellite for the BeiDou-1 system launched? | {
"text": [
"May 25, 2003"
],
"answer_start": [
227
]
} |
56e108e7cd28a01900c67487 | BeiDou_Navigation_Satellite_System | In 2007, the official Xinhua News Agency reported that the resolution of the BeiDou system was as high as 0.5 metres. With the existing user terminals it appears that the calibrated accuracy is 20m (100m, uncalibrated). | In 2007, what was the reported resolution of the BeiDou system? | {
"text": [
"as high as 0.5 metres"
],
"answer_start": [
95
]
} |
56e108e7cd28a01900c67488 | BeiDou_Navigation_Satellite_System | In 2007, the official Xinhua News Agency reported that the resolution of the BeiDou system was as high as 0.5 metres. With the existing user terminals it appears that the calibrated accuracy is 20m (100m, uncalibrated). | What is the calibrated accuracy of the BeiDou system? | {
"text": [
"20m"
],
"answer_start": [
194
]
} |
56e108e7cd28a01900c67489 | BeiDou_Navigation_Satellite_System | In 2007, the official Xinhua News Agency reported that the resolution of the BeiDou system was as high as 0.5 metres. With the existing user terminals it appears that the calibrated accuracy is 20m (100m, uncalibrated). | What is the uncalibrated accuracy of the BeiDou system? | {
"text": [
"100m"
],
"answer_start": [
199
]
} |
56e108e7cd28a01900c6748a | BeiDou_Navigation_Satellite_System | In 2007, the official Xinhua News Agency reported that the resolution of the BeiDou system was as high as 0.5 metres. With the existing user terminals it appears that the calibrated accuracy is 20m (100m, uncalibrated). | Who reported the resolution of the BeiDou system in 2007? | {
"text": [
"the official Xinhua News Agency"
],
"answer_start": [
9
]
} |
56e109accd28a01900c67497 | BeiDou_Navigation_Satellite_System | In 2008, a BeiDou-1 ground terminal cost around CN¥20,000RMB (US$2,929), almost 10 times the price of a contemporary GPS terminal. The price of the terminals was explained as being due to the cost of imported microchips. At the China High-Tech Fair ELEXCON of November 2009 in Shenzhen, a BeiDou terminal priced at CN¥3,... | How much did a BeiDou-1 ground terminal cost in 2008? | {
"text": [
"around CN¥20,000RMB (US$2,929)"
],
"answer_start": [
41
]
} |
56e109accd28a01900c67498 | BeiDou_Navigation_Satellite_System | In 2008, a BeiDou-1 ground terminal cost around CN¥20,000RMB (US$2,929), almost 10 times the price of a contemporary GPS terminal. The price of the terminals was explained as being due to the cost of imported microchips. At the China High-Tech Fair ELEXCON of November 2009 in Shenzhen, a BeiDou terminal priced at CN¥3,... | How much more did a BeiDou-1 ground terminal cost than a current GPS terminal? | {
"text": [
"almost 10 times the price"
],
"answer_start": [
73
]
} |
56e109accd28a01900c67499 | BeiDou_Navigation_Satellite_System | In 2008, a BeiDou-1 ground terminal cost around CN¥20,000RMB (US$2,929), almost 10 times the price of a contemporary GPS terminal. The price of the terminals was explained as being due to the cost of imported microchips. At the China High-Tech Fair ELEXCON of November 2009 in Shenzhen, a BeiDou terminal priced at CN¥3,... | Why is a BeiDou-1 ground terminal so expensive? | {
"text": [
"due to the cost of imported microchips"
],
"answer_start": [
181
]
} |
56e109accd28a01900c6749a | BeiDou_Navigation_Satellite_System | In 2008, a BeiDou-1 ground terminal cost around CN¥20,000RMB (US$2,929), almost 10 times the price of a contemporary GPS terminal. The price of the terminals was explained as being due to the cost of imported microchips. At the China High-Tech Fair ELEXCON of November 2009 in Shenzhen, a BeiDou terminal priced at CN¥3,... | Where was the ELEXCON fair held in 2009? | {
"text": [
"Shenzhen"
],
"answer_start": [
277
]
} |
56e109accd28a01900c6749b | BeiDou_Navigation_Satellite_System | In 2008, a BeiDou-1 ground terminal cost around CN¥20,000RMB (US$2,929), almost 10 times the price of a contemporary GPS terminal. The price of the terminals was explained as being due to the cost of imported microchips. At the China High-Tech Fair ELEXCON of November 2009 in Shenzhen, a BeiDou terminal priced at CN¥3,... | What was presented at the ELEXCON fair in 2009? | {
"text": [
"a BeiDou terminal priced at CN¥3,000RMB"
],
"answer_start": [
287
]
} |
56e10a27cd28a01900c674ab | BeiDou_Navigation_Satellite_System | According to Sun Jiadong, the chief designer of the navigation system, "Many organizations have been using our system for a while, and they like it very much." | Who is the chief designer of the BeiDou navigation system? | {
"text": [
"Sun Jiadong"
],
"answer_start": [
13
]
} |
56e10a27cd28a01900c674ad | BeiDou_Navigation_Satellite_System | According to Sun Jiadong, the chief designer of the navigation system, "Many organizations have been using our system for a while, and they like it very much." | Who is Sun Jiadong? | {
"text": [
"the chief designer of the navigation system"
],
"answer_start": [
26
]
} |
56e10ac2cd28a01900c674b9 | BeiDou_Navigation_Satellite_System | BeiDou-2 (formerly known as COMPASS) is not an extension to the older BeiDou-1, but rather supersedes it outright. The new system will be a constellation of 35 satellites, which include 5 geostationary orbit satellites for backward compatibility with BeiDou-1, and 30 non-geostationary satellites (27 in medium Earth orb... | What was the BeiDou-2 system previously known as? | {
"text": [
"COMPASS"
],
"answer_start": [
28
]
} |
56e10ac2cd28a01900c674ba | BeiDou_Navigation_Satellite_System | BeiDou-2 (formerly known as COMPASS) is not an extension to the older BeiDou-1, but rather supersedes it outright. The new system will be a constellation of 35 satellites, which include 5 geostationary orbit satellites for backward compatibility with BeiDou-1, and 30 non-geostationary satellites (27 in medium Earth orb... | How may satellites will the BeiDou-2 system have? | {
"text": [
"35"
],
"answer_start": [
157
]
} |
56e10ac2cd28a01900c674bb | BeiDou_Navigation_Satellite_System | BeiDou-2 (formerly known as COMPASS) is not an extension to the older BeiDou-1, but rather supersedes it outright. The new system will be a constellation of 35 satellites, which include 5 geostationary orbit satellites for backward compatibility with BeiDou-1, and 30 non-geostationary satellites (27 in medium Earth orb... | How many geostationary orbit satellites will the BeiDou-2 system have? | {
"text": [
"5"
],
"answer_start": [
158
]
} |
56e10ac2cd28a01900c674bc | BeiDou_Navigation_Satellite_System | BeiDou-2 (formerly known as COMPASS) is not an extension to the older BeiDou-1, but rather supersedes it outright. The new system will be a constellation of 35 satellites, which include 5 geostationary orbit satellites for backward compatibility with BeiDou-1, and 30 non-geostationary satellites (27 in medium Earth orb... | How many non-geostationary orbit satellites will the BeiDou-2 system have? | {
"text": [
"30"
],
"answer_start": [
265
]
} |
56e10ac2cd28a01900c674bd | BeiDou_Navigation_Satellite_System | BeiDou-2 (formerly known as COMPASS) is not an extension to the older BeiDou-1, but rather supersedes it outright. The new system will be a constellation of 35 satellites, which include 5 geostationary orbit satellites for backward compatibility with BeiDou-1, and 30 non-geostationary satellites (27 in medium Earth orb... | What is the purpose of the geostationary orbit satellites in the BeiDou-2 system? | {
"text": [
"for backward compatibility with BeiDou-1"
],
"answer_start": [
219
]
} |
56e10dbdcd28a01900c674e1 | BeiDou_Navigation_Satellite_System | The ranging signals are based on the CDMA principle and have complex structure typical of Galileo or modernized GPS. Similar to the other GNSS, there will be two levels of positioning service: open and restricted (military). The public service shall be available globally to general users. When all the currently planned... | What are the ranging signals of the BeiDou system based on? | {
"text": [
"the CDMA principle"
],
"answer_start": [
33
]
} |
56e10dbdcd28a01900c674e2 | BeiDou_Navigation_Satellite_System | The ranging signals are based on the CDMA principle and have complex structure typical of Galileo or modernized GPS. Similar to the other GNSS, there will be two levels of positioning service: open and restricted (military). The public service shall be available globally to general users. When all the currently planned... | What positioning levels will the BeiDou system offer? | {
"text": [
"open and restricted (military)"
],
"answer_start": [
193
]
} |
56e10dbdcd28a01900c674e3 | BeiDou_Navigation_Satellite_System | The ranging signals are based on the CDMA principle and have complex structure typical of Galileo or modernized GPS. Similar to the other GNSS, there will be two levels of positioning service: open and restricted (military). The public service shall be available globally to general users. When all the currently planned... | Where will the public service for the BeiDou system be available? | {
"text": [
"globally to general users"
],
"answer_start": [
263
]
} |
56e10dbdcd28a01900c674e4 | BeiDou_Navigation_Satellite_System | The ranging signals are based on the CDMA principle and have complex structure typical of Galileo or modernized GPS. Similar to the other GNSS, there will be two levels of positioning service: open and restricted (military). The public service shall be available globally to general users. When all the currently planned... | Who designed the COMPASS navigation system? | {
"text": [
"Sun Jiadong"
],
"answer_start": [
617
]
} |
56e10dbdcd28a01900c674e5 | BeiDou_Navigation_Satellite_System | The ranging signals are based on the CDMA principle and have complex structure typical of Galileo or modernized GPS. Similar to the other GNSS, there will be two levels of positioning service: open and restricted (military). The public service shall be available globally to general users. When all the currently planned... | How many satellites will the COMPASS navigation system use? | {
"text": [
"75+ satellites"
],
"answer_start": [
412
]
} |
56e10ed0cd28a01900c674f6 | BeiDou_Navigation_Satellite_System | There are two levels of service provided — a free service to civilians and licensed service to the Chinese government and military. The free civilian service has a 10-meter location-tracking accuracy, synchronizes clocks with an accuracy of 10 nanoseconds, and measures speeds to within 0.2 m/s. The restricted military ... | What is the range of accuracy for the free service offered to civilians? | {
"text": [
"10-meter location-tracking accuracy"
],
"answer_start": [
164
]
} |
56e10ed0cd28a01900c674f7 | BeiDou_Navigation_Satellite_System | There are two levels of service provided — a free service to civilians and licensed service to the Chinese government and military. The free civilian service has a 10-meter location-tracking accuracy, synchronizes clocks with an accuracy of 10 nanoseconds, and measures speeds to within 0.2 m/s. The restricted military ... | What is the range of accuracy for the licensed service used by Chinese government and military? | {
"text": [
"10 centimetres"
],
"answer_start": [
355
]
} |
56e10ed0cd28a01900c674f8 | BeiDou_Navigation_Satellite_System | There are two levels of service provided — a free service to civilians and licensed service to the Chinese government and military. The free civilian service has a 10-meter location-tracking accuracy, synchronizes clocks with an accuracy of 10 nanoseconds, and measures speeds to within 0.2 m/s. The restricted military ... | As of right now, who uses the licensed military service? | {
"text": [
"the People's Liberation Army and to the Military of Pakistan"
],
"answer_start": [
522
]
} |
56e10ed0cd28a01900c674f9 | BeiDou_Navigation_Satellite_System | There are two levels of service provided — a free service to civilians and licensed service to the Chinese government and military. The free civilian service has a 10-meter location-tracking accuracy, synchronizes clocks with an accuracy of 10 nanoseconds, and measures speeds to within 0.2 m/s. The restricted military ... | What is something the licensed military service can be used for? | {
"text": [
"communication"
],
"answer_start": [
387
]
} |
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