id stringlengths 24 24 | question stringlengths 1 270 | answer stringlengths 1 239 | documents listlengths 1 1 |
|---|---|---|---|
56e0fd33231d4119001ac54c | Who first came up with the idea for a Chinese satellite navigation system? | Chen Fangyun and his colleagues | [
"BeiDou_Navigation_Satellite_System\n\nThe 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:"
] |
56e0fd33231d4119001ac54d | When did Chen Fangyun come up with the idea for a satellite navigation system? | in the 1980s | [
"BeiDou_Navigation_Satellite_System\n\nThe 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:"
] |
56e0fd33231d4119001ac54e | The China National Space Administration said the satellite navigation system would be developed in how many steps? | three | [
"BeiDou_Navigation_Satellite_System\n\nThe 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:"
] |
56e0fdc8231d4119001ac558 | What was the name of the first satellite launched for the system? | BeiDou-1A | [
"BeiDou_Navigation_Satellite_System\n\nThe 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 n... |
56e0fdc8231d4119001ac559 | When was BeiDou-1A launched? | 20 December 2000 | [
"BeiDou_Navigation_Satellite_System\n\nThe 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 n... |
56e0fdc8231d4119001ac55a | What was the name of the third satellite launched for the system? | BeiDou-1C | [
"BeiDou_Navigation_Satellite_System\n\nThe 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 n... |
56e0fdc8231d4119001ac55b | What was the purpose of launching the BeiDou-1C satellite? | a backup satellite | [
"BeiDou_Navigation_Satellite_System\n\nThe 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 n... |
56e0fdc8231d4119001ac55c | When was the BeiDou-1C satellite launched? | 25 May 2003 | [
"BeiDou_Navigation_Satellite_System\n\nThe 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 n... |
56e10245e3433e1400422a96 | When did China announce service plans for the BeiDou system? | 2 November 2006 | [
"BeiDou_Navigation_Satellite_System\n\nOn 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]"
] |
56e10245e3433e1400422a97 | What was the accuracy range that China promised to offer in 2008 with the BeiDou system? | 10 meters | [
"BeiDou_Navigation_Satellite_System\n\nOn 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]"
] |
56e10245e3433e1400422a98 | What was the timing and speed that China promised to offer in 2008 with the BeiDou system? | timing of 0.2 microseconds, and speed of 0.2 meters/second | [
"BeiDou_Navigation_Satellite_System\n\nOn 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]"
] |
56e1030ae3433e1400422a9c | When was the fourth satellite for the BeiDou-1 system launched? | February 2007 | [
"BeiDou_Navigation_Satellite_System\n\nIn 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.... |
56e1030ae3433e1400422a9d | What is the name of the fourth BeiDou-1 satellite? | BeiDou-1D | [
"BeiDou_Navigation_Satellite_System\n\nIn 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.... |
56e1030ae3433e1400422a9e | What is the BeiDou-1D satellite sometimes called? | BeiDou-2A | [
"BeiDou_Navigation_Satellite_System\n\nIn 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.... |
56e1030ae3433e1400422a9f | What is the purpose of the BeiDou-1D satellite? | serving as a backup satellite | [
"BeiDou_Navigation_Satellite_System\n\nIn 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.... |
56e1030ae3433e1400422aa0 | What happened to the BeiDou-1D satellite that needed to be repaired? | a control system malfunction | [
"BeiDou_Navigation_Satellite_System\n\nIn 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.... |
56e103f6e3433e1400422ab0 | When was the first satellite for the BeiDou-2 system launched? | April 2007 | [
"BeiDou_Navigation_Satellite_System\n\nIn 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... |
56e103f6e3433e1400422ab1 | What is the the first satellite for the BeiDou-2 system called? | Compass-M1 | [
"BeiDou_Navigation_Satellite_System\n\nIn 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... |
56e103f6e3433e1400422ab3 | When was the second satellite for the BeiDou-2 system launched? | 15 April 2009 | [
"BeiDou_Navigation_Satellite_System\n\nIn 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... |
56e103f6e3433e1400422ab4 | When was the third satellite for the BeiDou-2 system launched? | 17 January 2010 | [
"BeiDou_Navigation_Satellite_System\n\nIn 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... |
56e10514e3433e1400422ad4 | How much was China going to invest in the European Galileo positioning system project? | €230 million (USD296 million, GBP160 million) | [
"BeiDou_Navigation_Satellite_System\n\nIn 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 ... |
56e10514e3433e1400422ad5 | In 2003, what was the planned purpose of the BeiDou navigation system? | only be used by its armed forces | [
"BeiDou_Navigation_Satellite_System\n\nIn 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 ... |
56e10514e3433e1400422ad6 | When did China join the Galileo project? | October 2004 | [
"BeiDou_Navigation_Satellite_System\n\nIn 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 ... |
56e10514e3433e1400422ad7 | When was China Galileo Industries (CGI) founded? | December 2004 | [
"BeiDou_Navigation_Satellite_System\n\nIn 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 ... |
56e10514e3433e1400422ad8 | Who said in 2008 that China was unsatisfied with its involvement in the Galileo project? | the Hong Kong-based South China Morning Post | [
"BeiDou_Navigation_Satellite_System\n\nIn 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 ... |
56e105afcd28a01900c67449 | What is the BeiDou-1? | an experimental regional navigation system | [
"BeiDou_Navigation_Satellite_System\n\nBeiDou-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 kilo... |
56e105afcd28a01900c6744a | The BeiDou-1 is made up of how may satellites? | four | [
"BeiDou_Navigation_Satellite_System\n\nBeiDou-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 kilo... |
56e105afcd28a01900c6744b | How many satellites in the BeiDou-1 system is used for back up? | one | [
"BeiDou_Navigation_Satellite_System\n\nBeiDou-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 kilo... |
56e105afcd28a01900c6744c | What were the BeiDou-1 system satellites based on? | the Chinese DFH-3 geostationary communications satellite | [
"BeiDou_Navigation_Satellite_System\n\nBeiDou-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 kilo... |
56e105afcd28a01900c6744d | How much did each satellite for the BeiDou-1 system weigh? | 1,000 kilograms (2,200 pounds) each | [
"BeiDou_Navigation_Satellite_System\n\nBeiDou-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 kilo... |
56e106b3e3433e1400422af0 | What type of satellites does the American GPS system use? | medium Earth orbit satellites | [
"BeiDou_Navigation_Satellite_System\n\nUnlike 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... |
56e106b3e3433e1400422af1 | What type of satellites does the BeiDou-1 system use? | satellites in geostationary orbit | [
"BeiDou_Navigation_Satellite_System\n\nUnlike 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... |
56e106b3e3433e1400422af2 | What is the purpose of the BeiDou-1 system using stallites in geostationary orbit? | the system does not require a large constellation of satellites | [
"BeiDou_Navigation_Satellite_System\n\nUnlike 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... |
56e106b3e3433e1400422af3 | What service area is covered by the BeiDou-1 system? | from longitude 70°E to 140°E and from latitude 5°N to 55°N | [
"BeiDou_Navigation_Satellite_System\n\nUnlike 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... |
56e106b3e3433e1400422af4 | What is the frequency of the BeiDou-1 system? | 2491.75 MHz | [
"BeiDou_Navigation_Satellite_System\n\nUnlike 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... |
56e10745cd28a01900c6745f | When was the first satellite for the BeiDou-1 system launched? | October 31, 2000 | [
"BeiDou_Navigation_Satellite_System\n\nThe 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."
] |
56e10745cd28a01900c67460 | What was the first satellite for the BeiDou-1 system called? | BeiDou-1A | [
"BeiDou_Navigation_Satellite_System\n\nThe 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."
] |
56e10745cd28a01900c67461 | When was the second satellite for the BeiDou-1 system launched? | December 21, 2000 | [
"BeiDou_Navigation_Satellite_System\n\nThe 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."
] |
56e10745cd28a01900c67462 | What was the second satellite for the BeiDou-1 system called? | BeiDou-1B | [
"BeiDou_Navigation_Satellite_System\n\nThe 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."
] |
56e10745cd28a01900c67463 | When was the last satellite for the BeiDou-1 system launched? | May 25, 2003 | [
"BeiDou_Navigation_Satellite_System\n\nThe 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."
] |
56e108e7cd28a01900c67487 | In 2007, what was the reported resolution of the BeiDou system? | as high as 0.5 metres | [
"BeiDou_Navigation_Satellite_System\n\nIn 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)."
] |
56e108e7cd28a01900c67488 | What is the calibrated accuracy of the BeiDou system? | 20m | [
"BeiDou_Navigation_Satellite_System\n\nIn 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)."
] |
56e108e7cd28a01900c67489 | What is the uncalibrated accuracy of the BeiDou system? | 100m | [
"BeiDou_Navigation_Satellite_System\n\nIn 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)."
] |
56e108e7cd28a01900c6748a | Who reported the resolution of the BeiDou system in 2007? | the official Xinhua News Agency | [
"BeiDou_Navigation_Satellite_System\n\nIn 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)."
] |
56e109accd28a01900c67497 | How much did a BeiDou-1 ground terminal cost in 2008? | around CN¥20,000RMB (US$2,929) | [
"BeiDou_Navigation_Satellite_System\n\nIn 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 ... |
56e109accd28a01900c67498 | How much more did a BeiDou-1 ground terminal cost than a current GPS terminal? | almost 10 times the price | [
"BeiDou_Navigation_Satellite_System\n\nIn 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 ... |
56e109accd28a01900c67499 | Why is a BeiDou-1 ground terminal so expensive? | due to the cost of imported microchips | [
"BeiDou_Navigation_Satellite_System\n\nIn 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 ... |
56e109accd28a01900c6749a | Where was the ELEXCON fair held in 2009? | Shenzhen | [
"BeiDou_Navigation_Satellite_System\n\nIn 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 ... |
56e109accd28a01900c6749b | What was presented at the ELEXCON fair in 2009? | a BeiDou terminal priced at CN¥3,000RMB | [
"BeiDou_Navigation_Satellite_System\n\nIn 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 ... |
56e10a27cd28a01900c674ab | Who is the chief designer of the BeiDou navigation system? | Sun Jiadong | [
"BeiDou_Navigation_Satellite_System\n\nAccording 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.\""
] |
56e10a27cd28a01900c674ac | What did Sun Jiadong have to say about the BeiDou navigation system? | "Many organizations have been using our system for a while, and they like it very much." | [
"BeiDou_Navigation_Satellite_System\n\nAccording 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.\""
] |
56e10a27cd28a01900c674ad | Who is Sun Jiadong? | the chief designer of the navigation system | [
"BeiDou_Navigation_Satellite_System\n\nAccording 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.\""
] |
56e10ac2cd28a01900c674b9 | What was the BeiDou-2 system previously known as? | COMPASS | [
"BeiDou_Navigation_Satellite_System\n\nBeiDou-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-geost... |
56e10ac2cd28a01900c674ba | How may satellites will the BeiDou-2 system have? | 35 | [
"BeiDou_Navigation_Satellite_System\n\nBeiDou-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-geost... |
56e10ac2cd28a01900c674bb | How many geostationary orbit satellites will the BeiDou-2 system have? | 5 | [
"BeiDou_Navigation_Satellite_System\n\nBeiDou-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-geost... |
56e10ac2cd28a01900c674bc | How many non-geostationary orbit satellites will the BeiDou-2 system have? | 30 | [
"BeiDou_Navigation_Satellite_System\n\nBeiDou-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-geost... |
56e10ac2cd28a01900c674bd | What is the purpose of the geostationary orbit satellites in the BeiDou-2 system? | for backward compatibility with BeiDou-1 | [
"BeiDou_Navigation_Satellite_System\n\nBeiDou-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-geost... |
56e10dbdcd28a01900c674e1 | What are the ranging signals of the BeiDou system based on? | the CDMA principle | [
"BeiDou_Navigation_Satellite_System\n\nThe 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 ge... |
56e10dbdcd28a01900c674e2 | What positioning levels will the BeiDou system offer? | open and restricted (military) | [
"BeiDou_Navigation_Satellite_System\n\nThe 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 ge... |
56e10dbdcd28a01900c674e3 | Where will the public service for the BeiDou system be available? | globally to general users | [
"BeiDou_Navigation_Satellite_System\n\nThe 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 ge... |
56e10dbdcd28a01900c674e4 | Who designed the COMPASS navigation system? | Sun Jiadong | [
"BeiDou_Navigation_Satellite_System\n\nThe 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 ge... |
56e10dbdcd28a01900c674e5 | How many satellites will the COMPASS navigation system use? | 75+ satellites | [
"BeiDou_Navigation_Satellite_System\n\nThe 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 ge... |
56e10ed0cd28a01900c674f5 | What types of services will be offered by the BeiDou system? | a free service to civilians and licensed service to the Chinese government and military | [
"BeiDou_Navigation_Satellite_System\n\nThere 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 ... |
56e10ed0cd28a01900c674f6 | What is the range of accuracy for the free service offered to civilians? | 10-meter location-tracking accuracy | [
"BeiDou_Navigation_Satellite_System\n\nThere 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 ... |
56e10ed0cd28a01900c674f7 | What is the range of accuracy for the licensed service used by Chinese government and military? | 10 centimetres | [
"BeiDou_Navigation_Satellite_System\n\nThere 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 ... |
56e10ed0cd28a01900c674f8 | As of right now, who uses the licensed military service? | the People's Liberation Army and to the Military of Pakistan | [
"BeiDou_Navigation_Satellite_System\n\nThere 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 ... |
56e10ed0cd28a01900c674f9 | What is something the licensed military service can be used for? | communication | [
"BeiDou_Navigation_Satellite_System\n\nThere 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 ... |
56e10feecd28a01900c67513 | How many frequencies does the COMPASS system use? | four bands | [
"BeiDou_Navigation_Satellite_System\n\nFrequencies for COMPASS are allocated in four bands: E1, E2, E5B, and E6 and overlap with Galileo. The fact of overlapping could be convenient from the point of view of the receiver design, but on the other hand raises the issues of inter-system interference, especially within... |
56e10feecd28a01900c67514 | What are the four bands of frequencies used by the COMPASS system called? | E1, E2, E5B, and E6 | [
"BeiDou_Navigation_Satellite_System\n\nFrequencies for COMPASS are allocated in four bands: E1, E2, E5B, and E6 and overlap with Galileo. The fact of overlapping could be convenient from the point of view of the receiver design, but on the other hand raises the issues of inter-system interference, especially within... |
56e10feecd28a01900c67515 | Which frequency bands are most likely to cause issues of inter-system interference with the Galileo system? | E1 and E2 | [
"BeiDou_Navigation_Satellite_System\n\nFrequencies for COMPASS are allocated in four bands: E1, E2, E5B, and E6 and overlap with Galileo. The fact of overlapping could be convenient from the point of view of the receiver design, but on the other hand raises the issues of inter-system interference, especially within... |
56e10feecd28a01900c67516 | Which bands are used by the Galileo system for their public service? | E1 and E2 | [
"BeiDou_Navigation_Satellite_System\n\nFrequencies for COMPASS are allocated in four bands: E1, E2, E5B, and E6 and overlap with Galileo. The fact of overlapping could be convenient from the point of view of the receiver design, but on the other hand raises the issues of inter-system interference, especially within... |
56e10feecd28a01900c67517 | According to International Telecommunication Union (ITU) policies, who is given higher priority to a specific frequency band? | the first nation to start broadcasting in a specific frequency | [
"BeiDou_Navigation_Satellite_System\n\nFrequencies for COMPASS are allocated in four bands: E1, E2, E5B, and E6 and overlap with Galileo. The fact of overlapping could be convenient from the point of view of the receiver design, but on the other hand raises the issues of inter-system interference, especially within... |
56e113edcd28a01900c67569 | How much information about the COMPASS system did Chinese authorities release? | little was officially announced | [
"BeiDou_Navigation_Satellite_System\n\nAlthough little was officially announced by Chinese authorities about the signals of the new system, the launch of the first COMPASS satellite permitted independent researchers not only to study general characteristics of the signals, but even to build a COMPASS receiver."
] |
56e113edcd28a01900c6756a | What is one thing launching the first COMPASS satellite enable researchers to do? | to study general characteristics of the signals | [
"BeiDou_Navigation_Satellite_System\n\nAlthough little was officially announced by Chinese authorities about the signals of the new system, the launch of the first COMPASS satellite permitted independent researchers not only to study general characteristics of the signals, but even to build a COMPASS receiver."
] |
56e113edcd28a01900c6756b | What is another thing launching the first COMPASS satellite enable researchers to do? | to build a COMPASS receiver | [
"BeiDou_Navigation_Satellite_System\n\nAlthough little was officially announced by Chinese authorities about the signals of the new system, the launch of the first COMPASS satellite permitted independent researchers not only to study general characteristics of the signals, but even to build a COMPASS receiver."
] |
56e1161ccd28a01900c67579 | When was the Compass-M1 satellite launched? | 14 April 2007 | [
"BeiDou_Navigation_Satellite_System\n\nCompass-M1 is an experimental satellite launched for signal testing and validation and for the frequency filing on 14 April 2007. The role of Compass-M1 for Compass is similar to the role of the GIOVE satellites for the Galileo system. The orbit of Compass-M1 is nearly circula... |
56e1161ccd28a01900c6757a | What is the purpose of the Compass-M1 satellite? | for signal testing and validation and for the frequency filing | [
"BeiDou_Navigation_Satellite_System\n\nCompass-M1 is an experimental satellite launched for signal testing and validation and for the frequency filing on 14 April 2007. The role of Compass-M1 for Compass is similar to the role of the GIOVE satellites for the Galileo system. The orbit of Compass-M1 is nearly circula... |
56e1161ccd28a01900c6757b | The purpose of the Compass-M1 satellite is similar to the purpose of what other satellite? | the GIOVE satellites for the Galileo system | [
"BeiDou_Navigation_Satellite_System\n\nCompass-M1 is an experimental satellite launched for signal testing and validation and for the frequency filing on 14 April 2007. The role of Compass-M1 for Compass is similar to the role of the GIOVE satellites for the Galileo system. The orbit of Compass-M1 is nearly circula... |
56e1161ccd28a01900c6757c | What is the altitude of the Compass-M1 satellite? | 21,150 km | [
"BeiDou_Navigation_Satellite_System\n\nCompass-M1 is an experimental satellite launched for signal testing and validation and for the frequency filing on 14 April 2007. The role of Compass-M1 for Compass is similar to the role of the GIOVE satellites for the Galileo system. The orbit of Compass-M1 is nearly circula... |
56e1161ccd28a01900c6757d | What is the inclination of the Compass-M1 satellite? | 55.5 degrees | [
"BeiDou_Navigation_Satellite_System\n\nCompass-M1 is an experimental satellite launched for signal testing and validation and for the frequency filing on 14 April 2007. The role of Compass-M1 for Compass is similar to the role of the GIOVE satellites for the Galileo system. The orbit of Compass-M1 is nearly circula... |
56e11911e3433e1400422bd4 | What frequency bands does Compass-M1 transmit in? | E2, E5B, and E6 | [
"BeiDou_Navigation_Satellite_System\n\nCompass-M1 transmits in 3 bands: E2, E5B, and E6. In each frequency band two coherent sub-signals have been detected with a phase shift of 90 degrees (in quadrature). These signal components are further referred to as \"I\" and \"Q\". The \"I\" components have shorter codes an... |
56e11911e3433e1400422bd5 | What is the phase shift of the sub-signals detected in each frequency band used by Compass-M1? | 90 degrees (in quadrature) | [
"BeiDou_Navigation_Satellite_System\n\nCompass-M1 transmits in 3 bands: E2, E5B, and E6. In each frequency band two coherent sub-signals have been detected with a phase shift of 90 degrees (in quadrature). These signal components are further referred to as \"I\" and \"Q\". The \"I\" components have shorter codes an... |
56e11911e3433e1400422bd6 | What are the two sub-signals in each frequency band referred to as? | "I" and "Q" | [
"BeiDou_Navigation_Satellite_System\n\nCompass-M1 transmits in 3 bands: E2, E5B, and E6. In each frequency band two coherent sub-signals have been detected with a phase shift of 90 degrees (in quadrature). These signal components are further referred to as \"I\" and \"Q\". The \"I\" components have shorter codes an... |
56e11911e3433e1400422bd7 | What is the intended purpose of the "I" component? | likely to be intended for the open service | [
"BeiDou_Navigation_Satellite_System\n\nCompass-M1 transmits in 3 bands: E2, E5B, and E6. In each frequency band two coherent sub-signals have been detected with a phase shift of 90 degrees (in quadrature). These signal components are further referred to as \"I\" and \"Q\". The \"I\" components have shorter codes an... |
56e11911e3433e1400422bd8 | What is the intended purpose of the "Q" component? | probably intended for the restricted service | [
"BeiDou_Navigation_Satellite_System\n\nCompass-M1 transmits in 3 bands: E2, E5B, and E6. In each frequency band two coherent sub-signals have been detected with a phase shift of 90 degrees (in quadrature). These signal components are further referred to as \"I\" and \"Q\". The \"I\" components have shorter codes an... |
56e11a26e3433e1400422be6 | When did the investigation of the signals transmitted by Compass -M1 begin? | immediately after the launch of Compass -M1 on 14 April 2007 | [
"BeiDou_Navigation_Satellite_System\n\nThe investigation of the transmitted signals started immediately after the launch of Compass -M1 on 14 April 2007. Soon after in June 2007, engineers at CNES reported the spectrum and structure of the signals. A month later, researchers from Stanford University reported the co... |
56e11a26e3433e1400422be7 | What did engineers at CNES report in June 2007? | the spectrum and structure of the signals | [
"BeiDou_Navigation_Satellite_System\n\nThe investigation of the transmitted signals started immediately after the launch of Compass -M1 on 14 April 2007. Soon after in June 2007, engineers at CNES reported the spectrum and structure of the signals. A month later, researchers from Stanford University reported the co... |
56e11a26e3433e1400422be8 | Who reported the complete decoding of the “I” signals components? | researchers from Stanford University | [
"BeiDou_Navigation_Satellite_System\n\nThe investigation of the transmitted signals started immediately after the launch of Compass -M1 on 14 April 2007. Soon after in June 2007, engineers at CNES reported the spectrum and structure of the signals. A month later, researchers from Stanford University reported the co... |
56e11a26e3433e1400422be9 | Who built the COMPASS receiver? | a group of engineers at Septentrio | [
"BeiDou_Navigation_Satellite_System\n\nThe investigation of the transmitted signals started immediately after the launch of Compass -M1 on 14 April 2007. Soon after in June 2007, engineers at CNES reported the spectrum and structure of the signals. A month later, researchers from Stanford University reported the co... |
56e11a26e3433e1400422bea | What was the purpose of building the COMPASS receiver? | report tracking and multipath characteristics of the “I” signals on E2 and E5B | [
"BeiDou_Navigation_Satellite_System\n\nThe investigation of the transmitted signals started immediately after the launch of Compass -M1 on 14 April 2007. Soon after in June 2007, engineers at CNES reported the spectrum and structure of the signals. A month later, researchers from Stanford University reported the co... |
56e11abce3433e1400422bf8 | What is the difference between the "I" signals on E2 and E5B and the civilian codes of GPS (L1-CA and L2C)? | Compass signals have somewhat greater power | [
"BeiDou_Navigation_Satellite_System\n\nCharacteristics of the \"I\" signals on E2 and E5B are generally similar to the civilian codes of GPS (L1-CA and L2C), but Compass signals have somewhat greater power. The notation of Compass signals used in this page follows the naming of the frequency bands and agrees with t... |
56e11bbce3433e1400422c0e | When did the Compass system begin operation on a trial bases? | December 2011 | [
"BeiDou_Navigation_Satellite_System\n\nIn December 2011, the system went into operation on a trial basis. It has started providing navigation, positioning and timing data to China and the neighbouring area for free from 27 December. During this trial run, Compass will offer positioning accuracy to within 25 meters,... |
56e11bbce3433e1400422c0f | When did the Compass system begin offering navigation, positioning and timing data to China and nearby locations? | 27 December | [
"BeiDou_Navigation_Satellite_System\n\nIn December 2011, the system went into operation on a trial basis. It has started providing navigation, positioning and timing data to China and the neighbouring area for free from 27 December. During this trial run, Compass will offer positioning accuracy to within 25 meters,... |
56e11bbce3433e1400422c10 | What will improve the positioning accuracy of the Compass system? | as more satellites are launched | [
"BeiDou_Navigation_Satellite_System\n\nIn December 2011, the system went into operation on a trial basis. It has started providing navigation, positioning and timing data to China and the neighbouring area for free from 27 December. During this trial run, Compass will offer positioning accuracy to within 25 meters,... |
56e11bbce3433e1400422c11 | Upon launching, the Compass system, what was the location accuracy promised to users? | accurate to the nearest 10 m | [
"BeiDou_Navigation_Satellite_System\n\nIn December 2011, the system went into operation on a trial basis. It has started providing navigation, positioning and timing data to China and the neighbouring area for free from 27 December. During this trial run, Compass will offer positioning accuracy to within 25 meters,... |
56e11bbce3433e1400422c12 | Upon launching, the Compass system, what was the speed promised to users? | within 0.2 m per second | [
"BeiDou_Navigation_Satellite_System\n\nIn December 2011, the system went into operation on a trial basis. It has started providing navigation, positioning and timing data to China and the neighbouring area for free from 27 December. During this trial run, Compass will offer positioning accuracy to within 25 meters,... |
56e11c2bcd28a01900c675e1 | When did the BeiDou-2 system start offering services? | December 2012 | [
"BeiDou_Navigation_Satellite_System\n\nThe BeiDou-2 system began offering services for the Asia-Pacific region in December 2012. At this time, the system could provide positioning data between longitude 55°E to 180°E and from latitude 55°S to 55°N."
] |
56e11c2bcd28a01900c675e2 | Where did the BeiDou-2 system start offering services in 2012? | the Asia-Pacific region | [
"BeiDou_Navigation_Satellite_System\n\nThe BeiDou-2 system began offering services for the Asia-Pacific region in December 2012. At this time, the system could provide positioning data between longitude 55°E to 180°E and from latitude 55°S to 55°N."
] |
56e11c2bcd28a01900c675e3 | At the time when BeiDou-2 system began offering services, what was the positioning data the system was able to provide? | between longitude 55°E to 180°E and from latitude 55°S to 55°N | [
"BeiDou_Navigation_Satellite_System\n\nThe BeiDou-2 system began offering services for the Asia-Pacific region in December 2012. At this time, the system could provide positioning data between longitude 55°E to 180°E and from latitude 55°S to 55°N."
] |
56e11d89e3433e1400422c20 | When did the Beidou system begin operating in China? | December 2011 | [
"BeiDou_Navigation_Satellite_System\n\nIn December 2011, Xinhua stated that \"[t]he basic structure of the Beidou system has now been established, and engineers are now conducting comprehensive system test and evaluation. The system will provide test-run services of positioning, navigation and time for China and th... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.