answer stringlengths 1 239 ⌀ | question stringlengths 1 25.7k |
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10 meters | What was the accuracy range that China promised to offer in 2008 with the BeiDou system? |
timing of 0.2 microseconds, and speed of 0.2 meters/second | What was the timing and speed that China promised to offer in 2008 with the BeiDou system? |
February 2007 | When was the fourth satellite for the BeiDou-1 system launched? |
BeiDou-1D | What is the name of the fourth BeiDou-1 satellite? |
BeiDou-2A | What is the BeiDou-1D satellite sometimes called? |
serving as a backup satellite | What is the purpose of the BeiDou-1D satellite? |
a control system malfunction | What happened to the BeiDou-1D satellite that needed to be repaired? |
April 2007 | When was the first satellite for the BeiDou-2 system launched? |
Compass-M1 | What is the the first satellite for the BeiDou-2 system called? |
to validate frequencies for the BeiDou-2 constellation | What is the purpose of the Compass-M1 satellite? |
15 April 2009 | When was the second satellite for the BeiDou-2 system launched? |
17 January 2010 | When was the third satellite for the BeiDou-2 system launched? |
€230 million (USD296 million, GBP160 million) | How much was China going to invest in the European Galileo positioning system project? |
only be used by its armed forces | In 2003, what was the planned purpose of the BeiDou navigation system? |
October 2004 | When did China join the Galileo project? |
December 2004 | When was China Galileo Industries (CGI) founded? |
the Hong Kong-based South China Morning Post | Who said in 2008 that China was unsatisfied with its involvement in the Galileo project? |
an experimental regional navigation system | What is the BeiDou-1? |
four | The BeiDou-1 is made up of how may satellites? |
one | How many satellites in the BeiDou-1 system is used for back up? |
the Chinese DFH-3 geostationary communications satellite | What were the BeiDou-1 system satellites based on? |
1,000 kilograms (2,200 pounds) each | How much did each satellite for the BeiDou-1 system weigh? |
medium Earth orbit satellites | What type of satellites does the American GPS system use? |
satellites in geostationary orbit | What type of satellites does the BeiDou-1 system use? |
the system does not require a large constellation of satellites | What is the purpose of the BeiDou-1 system using stallites in geostationary orbit? |
from longitude 70°E to 140°E and from latitude 5°N to 55°N | What service area is covered by the BeiDou-1 system? |
2491.75 MHz | What is the frequency of the BeiDou-1 system? |
October 31, 2000 | When was the first satellite for the BeiDou-1 system launched? |
BeiDou-1A | What was the first satellite for the BeiDou-1 system called? |
December 21, 2000 | When was the second satellite for the BeiDou-1 system launched? |
BeiDou-1B | What was the second satellite for the BeiDou-1 system called? |
May 25, 2003 | When was the last satellite for the BeiDou-1 system launched? |
as high as 0.5 metres | In 2007, what was the reported resolution of the BeiDou system? |
20m | What is the calibrated accuracy of the BeiDou system? |
100m | What is the uncalibrated accuracy of the BeiDou system? |
the official Xinhua News Agency | Who reported the resolution of the BeiDou system in 2007? |
around CN¥20,000RMB (US$2,929) | How much did a BeiDou-1 ground terminal cost in 2008? |
almost 10 times the price | How much more did a BeiDou-1 ground terminal cost than a current GPS terminal? |
due to the cost of imported microchips | Why is a BeiDou-1 ground terminal so expensive? |
Shenzhen | Where was the ELEXCON fair held in 2009? |
a BeiDou terminal priced at CN¥3,000RMB | What was presented at the ELEXCON fair in 2009? |
Sun Jiadong | Who is the chief designer of the BeiDou navigation system? |
"Many organizations have been using our system for a while, and they like it very much." | What did Sun Jiadong have to say about the BeiDou navigation system? |
the chief designer of the navigation system | Who is Sun Jiadong? |
COMPASS | What was the BeiDou-2 system previously known as? |
35 | How may satellites will the BeiDou-2 system have? |
5 | How many geostationary orbit satellites will the BeiDou-2 system have? |
30 | How many non-geostationary orbit satellites will the BeiDou-2 system have? |
for backward compatibility with BeiDou-1 | What is the purpose of the geostationary orbit satellites in the BeiDou-2 system? |
the CDMA principle | What are the ranging signals of the BeiDou system based on? |
open and restricted (military) | What positioning levels will the BeiDou system offer? |
globally to general users | Where will the public service for the BeiDou system be available? |
Sun Jiadong | Who designed the COMPASS navigation system? |
75+ satellites | How many satellites will the COMPASS navigation system use? |
a free service to civilians and licensed service to the Chinese government and military | What types of services will be offered by the BeiDou system? |
10-meter location-tracking accuracy | What is the range of accuracy for the free service offered to civilians? |
10 centimetres | What is the range of accuracy for the licensed service used by Chinese government and military? |
the People's Liberation Army and to the Military of Pakistan | As of right now, who uses the licensed military service? |
communication | What is something the licensed military service can be used for? |
four bands | How many frequencies does the COMPASS system use? |
E1, E2, E5B, and E6 | What are the four bands of frequencies used by the COMPASS system called? |
E1 and E2 | Which frequency bands are most likely to cause issues of inter-system interference with the Galileo system? |
E1 and E2 | Which bands are used by the Galileo system for their public service? |
the first nation to start broadcasting in a specific frequency | According to International Telecommunication Union (ITU) policies, who is given higher priority to a specific frequency band? |
little was officially announced | How much information about the COMPASS system did Chinese authorities release? |
to study general characteristics of the signals | What is one thing launching the first COMPASS satellite enable researchers to do? |
to build a COMPASS receiver | What is another thing launching the first COMPASS satellite enable researchers to do? |
14 April 2007 | When was the Compass-M1 satellite launched? |
for signal testing and validation and for the frequency filing | What is the purpose of the Compass-M1 satellite? |
the GIOVE satellites for the Galileo system | The purpose of the Compass-M1 satellite is similar to the purpose of what other satellite? |
21,150 km | What is the altitude of the Compass-M1 satellite? |
55.5 degrees | What is the inclination of the Compass-M1 satellite? |
E2, E5B, and E6 | What frequency bands does Compass-M1 transmit in? |
90 degrees (in quadrature) | What is the phase shift of the sub-signals detected in each frequency band used by Compass-M1? |
"I" and "Q" | What are the two sub-signals in each frequency band referred to as? |
likely to be intended for the open service | What is the intended purpose of the "I" component? |
probably intended for the restricted service | What is the intended purpose of the "Q" component? |
immediately after the launch of Compass -M1 on 14 April 2007 | When did the investigation of the signals transmitted by Compass -M1 begin? |
the spectrum and structure of the signals | What did engineers at CNES report in June 2007? |
researchers from Stanford University | Who reported the complete decoding of the “I” signals components? |
a group of engineers at Septentrio | Who built the COMPASS receiver? |
report tracking and multipath characteristics of the “I” signals on E2 and E5B | What was the purpose of building the COMPASS receiver? |
Compass signals have somewhat greater power | What is the difference between the "I" signals on E2 and E5B and the civilian codes of GPS (L1-CA and L2C)? |
December 2011 | When did the Compass system begin operation on a trial bases? |
27 December | When did the Compass system begin offering navigation, positioning and timing data to China and nearby locations? |
as more satellites are launched | What will improve the positioning accuracy of the Compass system? |
accurate to the nearest 10 m | Upon launching, the Compass system, what was the location accuracy promised to users? |
within 0.2 m per second | Upon launching, the Compass system, what was the speed promised to users? |
December 2012 | When did the BeiDou-2 system start offering services? |
the Asia-Pacific region | Where did the BeiDou-2 system start offering services in 2012? |
between longitude 55°E to 180°E and from latitude 55°S to 55°N | At the time when BeiDou-2 system began offering services, what was the positioning data the system was able to provide? |
December 2011 | When did the Beidou system begin operating in China? |
by 2020 | When is it projected that the global navigation system will be finished? |
16 | As of December 2012, how many satellites had been launched for the BeiDou-2 system? |
14 | Of the 16 satellites launched for the BeiDou-2 system, how many are operational? |
2007 | When was the Compass-M1 satellite launced? |
nine | How many satellites were launched from 2009-2011? |
functional regional coverage | What was achieved by launching 9 additional satellites from 2009-2011? |
16 | How many satellites were launched since 2007? |
2015 | When did the BeiDou system begin transitioning to global coverage? |
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