COMPASS navigation 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 global navigation system that is currently under construction.
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 been offering navigation services, mainly for customers in China and neighboring regions, since 2000.
The second generation of the system, officially called the BeiDou Satellite Navigation 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 2013. It became operational in China in December 2011, with 10 satellites in use, and began offering services to customers in the Asia-Pacific region in December 2012. It is planned to begin serving global customers upon its completion in 2020.
- 1 Nomenclature
- 2 History
- 3 Experimental system (BeiDou-1)
- 4 Global system (BeiDou Navigation Satellite System or BeiDou-2)
- 5 List of satellites (as of December 2012)
- 6 References
- 7 External links
The BeiDou Navigation System 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. Historically, this set of stars was used in navigation to locate the North Star Polaris. As such, the name BeiDou also serves as a metaphor for the purpose of the satellite navigation system.
Conception and initial development
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:
- 2000–2003: experimental BeiDou navigation system consisting of 3 satellites
- by 2012: regional BeiDou navigation system covering China and neighboring regions
- by 2020: global BeiDou navigation 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.
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.
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.
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.
Chinese involvement in Galileo system
In September 2003, China intended to join the European
Experimental system (BeiDou-1)
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.
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 visible. The area that can be serviced is from longitude 70°E to 140°E and from latitude 5°N to 55°N. A frequency of the system is 2491.75 MHz.
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.
To calculate a position, the following procedure is used:
- A signal is transmitted skyward by a remote terminal.
- Each of the geostationary satellites receive the signal.
- Each satellite sends the accurate time of when each received the signal to a ground station.
- The ground station calculates the longitude and latitude of the remote terminal, and determines the altitude from a relief map.
- The ground station sends the remote terminal's 3D position to the satellites.
- The satellites broadcast the calculated position to the remote terminal.
In 2007, the official Xinhua News Agency reported that the resolution of the BeiDou system was as high as 0.5 metres, considerably better than unaided GPS. With the existing user terminals it appears that the calibrated accuracy is 20m (100m, uncalibrated).
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¥3,000RMB was presented.
- Over 1,000 BeiDou-1 terminals were used after the 2008 Sichuan earthquake, providing information from the disaster area.
- As of October 2009, all Chinese border guards in Yunnan are equipped with BeiDou-1 devices.
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 orbit and 3 in inclined geosynchronous orbit), that will offer complete coverage of the globe.
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 service has a location accuracy of 10 centimetres, can be used for communication, and will supply information about the system status to the user. To date, the military service has been granted only to the People's Liberation Army and to the Military of Pakistan.
The new system will be a constellation of 35 satellites, which include 5 geostationary orbit (GEO) satellites and 30 medium Earth orbit (MEO) satellites, that will offer complete coverage of the globe. 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 GNSS systems are deployed, the users will benefit from the use of a total constellation of 75+ satellites, which will significantly improve all the aspects of positioning, especially availability of the signals in so-called urban canyons. The general designer of Compass navigation system is Sun Jiadong, who is also the general designer of its predecessor, the original Beidou navigation system.
Frequencies 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 E1 and E2 bands, which are allocated for Galileo's publicly regulated service. However, under International Telecommunication Union (ITU) policies, the first nation to start broadcasting in a specific frequency will have priority to that frequency, and any subsequent users will be required to obtain permission prior to using that frequency, and otherwise ensure that their broadcasts do not interfere with the original nation's broadcasts. It now appears that Chinese Compass satellites will start transmitting in the E1, E2, E5B, and E6 bands before Europe's Galileo satellites and thus have primary rights to these frequency ranges.
Although 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.
Compass-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 circular, has an altitude of 21,150 km and an inclination of 55.5 degrees.
Compass-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 and are likely to be intended for the open service. The "Q" components have much longer codes, are more interference resistive, and are probably intended for the restricted service.
The 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 complete decoding of the “I” signals components. The knowledge of the codes allowed a group of engineers at Septentrio to build the COMPASS receiver and report tracking and multipath characteristics of the “I” signals on E2 and E5B.
|Code modulation||BPSK(2)||BPSK(2)||BPSK(2)||BPSK(10)||BPSK(10)||BPSK (10)||BPSK (1)|
|Carrier frequency, MHz||1561.098||1561.098||1207.14||1207.14||1268.52||1268.52||1575.42|
|Chip rate, Mchips/s||2.046||2.046||2.046||10.230||10.230||10.230||1.023|
|Code period, chips||2046||??||2046||??||10230||??||1023|
|Code period, ms||1.0||>400||1.0||>160||1.0||>160||1.0|
|Navigation frames, s||6||??||6||??||??||??||6|
|Navigation sub-frames, s||30||??||30||??||??||??||30|
|Navigation period, min||12.0||??||12.0||??||??||??||12.5|
Characteristics 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 the notation used in the American literature on the subject, but the notation used by the Chinese seems to be different and is quoted in the first row of the table.
List of Compass launches
|Mission||Date||Name||Launch site||Launch vehicle||Bus||Orbit|
|07-32||2007-04-13||Compass-M1||Xichang||CZ-3A||DFH-3||MEO ~21,500 km|
|07-40||2010-07-31||Compass-IGSO1||Xichang||CZ-3A||DFH-3||HEO ~36,000 km|
|07-45||2010-12-17||Compass-IGSO2||Xichang||CZ-3A||DFH-3||HEO ~36,000 km|
|07-46||2011-04-10||Compass-IGSO3||Xichang||CZ-3A||DFH-3||HEO ~36,000 km|
|07-49||2011-07-27||Compass-IGSO4||Xichang||CZ-3A||DFH-3||HEO ~36,000 km|
|07-51||2011-12-01||Compass-IGSO5||Xichang||CZ-3A||DFH-3||HEO ~36,000 km|
|Xichang||CZ-3B||DFH-3B||MEO ~21,500 km|
|Xichang||CZ-3B||DFH-3B||MEO ~21,500 km|
In 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, but the precision will improve as more satellites are launched. Upon the system's official launch, it pledged to offer general users positioning information accurate to the nearest 10 m, measure speeds within 0.2 m per second, and provide signals for clock synchronisation accurate to 0.02 microseconds.
The 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.
In 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 the neighboring areas before the end of this year, according to the authorities." The system became operational in the China region that same month. The global navigation system should be finished by 2020. As of December 2012, 16 satellites for BeiDou-2 have been launched, 14 of them are in service.
List of satellites (as of December 2012)
|4/14/2007||LM-3A||Compass-M1||MEO ~21,500 km||Testing only||BeiDou-2 (Compass)|
|1/17/2010||LM-3C||Compass-G1||GEO 144.5°E ||Yes|
|8/1/2010||LM-3A||Compass-IGSO1||118°E incl 55°||Yes|
|12/18/2010||LM-3A||Compass-IGSO2||118°E incl 55°||Yes|
|04/10/2011||LM-3A||Compass-IGSO3||118°E incl 55°||Yes|
|07/26/2011||LM-3A||Compass-IGSO4||95°E incl 55°||Yes|
|12/02/2011||LM-3A||Compass-IGSO5||95°E incl 55°||Yes|
|04/29/2012||LM-3B||Compass-M3||MEO incl 55°||Yes|
|04/29/2012||LM-3B||Compass-M4||MEO incl 55°||Yes|
|09/18/2012||LM-3B||Compass-M5||MEO incl 55°||Yes|
|09/18/2012||LM-3B||Compass-M6||MEO incl 55°||Yes|
- Official website of BeiDou Navigation Satellite System
- BDstar Navigation
- BeiDou (Big Dipper) - GlobalSecurity.org
- Aviation International News
- BeiDou-1 - SinoDefence.com
- BeiDou-2 - SinoDefence.com
- Compass on the Chinese Defence Today website
- Compass-M1 orbit details can be found in the Space-Track catalogue with a name "Beidou M1"
- China launched its fourth satellite of Compass navigation system