GLONASS
Fri 25 May 2007
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Technorati Tags: GLONASSWed 7 Feb 2007
Fourth Beidou Navigation Satellite Launched Successfully
Posted by admin under China , Russian , United States , Rocket , Beidou , GPS , Satellite Navigation System , Galileo , Satellite Communications , Compas Navigation Satellite System , GLONASS , JDAMNo Comments
China successfully launched the 1331 fourth in the early hours of 3 Beidou navigation satellite, and so far has been to stabilize the operation, The Beidou navigation system in good working condition pilot basis, started building the intellectual property rights of its own global satellite navigation system Beidou satellite navigation system (Compas Navigation Satellite System's). China Beidou satellite navigation system of five geostationary orbit by the space of 30 satellites and non-geostationary satellite orbit satellites. opening up services and mandated services to provide services through two areas : opening up the service was in the position to provide free, Speed and time service, and the positioning accuracy of 10 meters, a time of 50 ns precision, accuracy of 0.2 meters per second gun; authorized services to authorized users to provide a more secure location, speed, professor at the integrity of information and communication services and systems. Since 2000, China has successfully launched three "Beidou navigation satellite." Beidou Navigation System tests completed. The system in China and its surrounding area have the positioning delegate, messaging and wide area differential GPS function. and the mapping, telecommunications, water, transportation, fishing, exploration, Forest fires and national security play an important role in many fields. China is building the Beidou satellite navigation system from geostationary orbit satellite space segment and 30 were non-geostationary satellite orbit composed of two types of services, is the opening up of services and mandated services. Free service was in the open position to provide velocity and time service, and the positioning accuracy of 10 meters. Timing accuracy of 50 nanoseconds, gun accuracy of 0.2 meters per second. Authorized services to authorized users to provide a more secure location, speed, professor at the integrity of information and communication services and systems. China plans to launch two Beidou navigation satellites early 2007. China and the surrounding areas to meet around 2008 users of the demand for satellite navigation systems, and network and system test gradually extended to the global satellite navigation system. Experts said that China's development and production of its own Beidou satellite navigation system, not just at any time. any, in addition to the geographic location of users to determine latitude, longitude and altitude capability, but the positioning and performance innovations. Currently, there are only a few countries have their own satellite navigation system, The United States is currently operating with the GPS system and Russia's GLONASS system.
China's participation in the European Galileo satellite global positioning plan is also being carried out with great fanfare. (End) March 20, 2003, the outbreak of the war in Iraq. A large number of bombers, fighters Clouds to the Iraqi capital of Baghdad, a bomb completely destroyed a building to be accurate. The operation, codenamed : "decapitation" 4, a B-1B "gun cavalry" bombers temporary task, bomb destroyed another building. Their target is a person : Saddam. Hussein, they use the combined attack : a bomb is a bomb (JDAM). The reason why these bombs to precise targets, because they are positioning satellite positioning to achieve. This service is provided by the positioning of 24 American satellites of the Global Positioning System — GPS. At 0:34 a.m. on May 25, 2003. China's Xichang Satellite Launch Center in the "LM-3A" carrier rockets succeeded to the third "Beidou" navigation and positioning satellite into orbit. The first two "Beidou" satellites on October 31, 2000 and December 21 launch. The running navigation and positioning system stability, excellent condition. The launch is the backup satellite navigation and positioning system. With the first two "Beidou" satellites work in a complete satellite navigation and positioning system to ensure all-weather. Anytime providing satellite navigation information. This indicates that China become a global satellite positioning system (GPS) and the former Soviet Union's Global Navigation Satellite System (GLONASS), the world's first satellite navigation system has established a perfect three countries The establishment of the system of national defense and economic construction in China will play a positive role. Back in the late 1960s, China launched a satellite navigation system on the development work, but because of a variety of reasons and day packs. In developed "Meridian NG" positioning equipment late start, resulting in a large number of equipment used later. basically depend on imports. Since the late 1970s, launched a study of satellite navigation and positioning system suitable for the national research system. Have proposed single-Star, Star, Samsung and 3 regional five-star system, and the idea of a multi-satellite global system. and taking into account the integrated use of navigation and communication problems, but due to various reasons. no such plans and ideas can be realized. Three scientists from the United States in July 1982 and in December proposed naming the GEOSTAR system. This is the active Global Positioning System satellites in orbit. In the process, because the GPS satellite navigation system is better positioned to the rise and is developing fairly rapidly. GEOSTAR system had to make in September 1991 to withdraw their capital. The system is being implemented and led GEOSTA failure.
Moreover, China's "Beidou" satellite navigation system is the 1980s "Star rapid positioning system," the development plan. Beidou Navigation System program in 1983, constitute the outstanding support is the small number of space satellites, user terminal equipment is simple, the complexity of all the centers are concentrated in the ground station. "Beidou" satellites in geosynchronous satellite positioning system is used to provide users with rapid positioning. the number of short messaging system and a professor at the weather service, a regional satellite positioning systems. The core functions of the system are : 1 : Determine the regular geographical location of the user, and the department in charge of providing navigation information to users. 2 : communications users. Center users with digital control systems can achieve two-way short messaging system. 3, a time when the awarding 0000 : Timing Control System Information Center for the time delay that users value. "Beidou" satellite positioning system work "Beidou" static earth orbit satellite positioning system only satellite (800E and 1400E), the first satellite in orbit backup (110.50E). central control system calibration systems and various user machine parts. The system is the process by the central control system : First, to ask the satellite signals simultaneously I and II satellites. Drive area of satellite transponder services subscriber radio. Asked the users to respond to a satellite signal and at the same time to respond to signals sent two satellites. Drive back to a central control system satellite transponder. Central control system receiver and demodulator signal sent to the user, based on the application of data processing services accordingly. Location for the center, two control systems testing : time delay signal from the central control system asked, reach users via a satellite transponder, issued positioning signal, on the same satellite transponder back to a central control system delays; asked the signals sent from the control center and, After these same satellite to users and users respond to signals sent by another satellite transmitted back to a central control system delays. Due to a central control system and two satellite locations are known, Therefore amount can be worked out by the top two users to delay the first satellite distance and the distance of the two satellites, as well as users, so users know at the Center for a first satellite, a sphere, and two satellites to focus on exchanges between the ellipsoid line. Also stored in the central computer control system from the digital terrain elevation map tracing value to the user. users can know for certain benchmarks ellipsoid parallel with the Earth's spherical surface. Thus a central control system where users can finally calculate the three-dimensional coordinates of points.
The station coordinates signals sent from encryption to users. "Beidou" is the coverage of a 5 ° to 55 ° latitude. between 70 ° and 110 ° east longitude in the heart of a region that lay on the small, simple as in the 35 ° latitude. Its level of precision positioning accuracy of 100 meters (1 σ), the establishment of calibration points after 20 meters (similar difference state). : 2491.75MHz frequency. System can accommodate the number of users to 540,000 households per hour. "Beidou" GPS satellite navigation system and one more coverage : The Beidou navigation system is our local coverage of the regional navigation system. Coverage of a 140 ° east longitude 70 ° and 55 ° north latitude 5 ° 1. GPS is global coverage, all-weather navigation system. To ensure that any location on the planet. 6-9 can be observed at any time while satellites (as a matter of fact, the most that can be observed 11-ying). 2, the number of satellites and orbital characteristics : The Beidou navigation system is set up in the Earth's equatorial plane of two satellites in geosynchronous satellites from the equator angle of about 60 degrees. GPS is installed in six orbital planes of 24 satellites, equatorial orbit inclined at 55 °, 60 ° from the orbital plane angle equator. Freedom prevail synchronous orbit satellites, orbiting the earth 58 hours a week for 11 hours. 3, the Beidou navigation and positioning system is the active principle : 2D navigation and two-way location. Ground Control System Solution Center, three-dimensional positioning information for users. GPS PN is a passive one-way location-based navigation. Solving their independence from the user equipment 3D positioning data. "Beidou" bring the two aspects of this principle. First, users have lost their position at the same time concealed radio, a considerable disadvantage in the military. As other equipment must include transmitters, the size, weight, price and low power consumption are placed in a disadvantageous position. 4, the Beidou navigation and positioning accuracy : 3-D positioning accuracy of about a dozen meters, the awarding accuracy of about 100 nanoseconds. P code currently own three-dimensional GPS positioning accuracy from 16m to 6m. C 25-100m to 12m away from the current code, accuracy before awarding about 2ns. 5, the Beidou navigation system users : capacity ranging inquiry because it is a two-way initiative — Response System, user equipment and geosynchronous satellite control center ground between not only to receive the signal asking, Synchronous Satellite Launch also asked respondents to the user equipment signals, so that users of the system depends on the capacity of the channel blocking to allow users to ask the user rate and signal frequency response.
Therefore, the Beidou navigation system is the limited capacity of the user equipment. GPS location is a one-way system, as long as the user equipment can receive messages navigation satellite navigation positioning for location. Therefore GPS user equipment capacity is unlimited. 6, and all navigation and positioning satellite system : survivability, "Beidou" based on the work of the center and satellite control system, However, "Beidou" obviously dependent on the central control system to a much larger, Solution position because there's not completed by the user equipment. To remedy this vulnerability system, GPS technology is being developed interstellar horizontal data chain. If so, after the destruction of the GPS satellite control stations can operate independently. "Beidou" Such a possibility was excluded from the principle that once a central control system damage. system will be unable to continue their work. 7, immediately : "Beidou" users to apply for the position back to a central control system, 3D users control system calculated the center position after being sent back data users. After a geostationary satellite, we should go back, coupled with the satellite transponder, and a central control system, delayed even longer, for high-speed sports body, it has increased the positioning error. In addition, the "Beidou" satellite navigation systems have some of their own characteristics. its messaging communication with the GPS function is not available. As mentioned above, the Beidou navigation satellite system with a smaller number of low investment, simple and low cost user equipment. achieve certain regional navigation positioning, multi-purpose communications that will meet our current ground, naval and air transport navigation and positioning needs. Deficiency is not covered polar regions, near the equator positioning accuracy, the only active two-dimensional positioning users needed to provide elevation data, and could not meet the military secrecy and high dynamic user requirements, subject to certain restrictions on the number of users. But the most important thing is, "Beidou" navigation system is the establishment of an independent satellite navigation system. It marks the successful development of the United States to break Russia's monopoly in this field. China's own satellite navigation system to resolve any problems. It is a successful, practical, small initial investment starting system. In addition, the department will be established on this basis-the wide area differential GPS systems. SA interference can enable the positioning accuracy of the GPS receiver civil code amendment to a few meters from the 100-level class. be in a better position to promote the use of GPS in society. Of course, we also need to recognize that with the continuous development of our high-tech weapons. navigation and positioning information to support the increasingly high demands. The Beidou navigation system is only recently met the four criteria needed for simple navigation system independent, it We must develop "Beidou" basis, and learn from GPS, GLONASS the successful experience Development of China's second-generation satellite navigation system, we have every reason to believe that in the near future, with advanced, applicability, dual-use, sexual interference, sexual characteristics of the resistance following the crash. suitable for China's national conditions "Beidou II," will be displayed in front of everyone. more of China's satellite navigation system will also improve the building. (Author : Sharon were set "China Information Technology") at 12:28 a.m. on February 3. China's Xichang Satellite Launch Center in the "LM-3A" carrier rockets successful Beidou navigation satellite into space.
This is the fourth launch of the Beidou navigation satellite. Xinhua Xinhuanet perturbation Jul 1331 February 3 (Xinhua new Where Sun Yan) on the 3rd% 6.28 pm, from the Xichang Satellite Launch Center in China "LM-3A" carrier rockets successful Beidou navigation satellite into space. About 24 minutes later, the satellite was separated from its carrier rocket. Data transmitted from the Xi'an Satellite Monitoring and Control Center showed that the satellite accurately entered its preset orbit. Responsible person said that China is the fourth launch of the Beidou navigation satellite. In the first three Beidou navigation satellite on October 31, 2000. December 21, and May 25, 2003 launch. Beidou Navigation Testing System has steady work in excellent condition, in mapping, telecommunications, water, transportation, fishing, exploration, Forest fires and national security play an important role in many fields. The launch of the satellite, which will further enhance the Beidou navigation system performance and reliability tests. Beidou satellite navigation system will be carried out (Compass Navigation Satellit e System for English name 北 Chinese transliteration of the name) of the test. Test on the basis of the Beidou navigation system, China is implementing the construction of the Beidou satellite navigation system China plans to meet around 2008 users of satellite navigation systems and the surrounding area needs and network and system testing, and gradually expand to the global satellite navigation system. The system will be used mainly for the country's economic construction, China's transportation, meteorology, petroleum, marine, forest fire prevention, disaster forecast, communications, public security and other special industries and efficient navigation and positioning services. Satellite navigation system to bring tremendous social and economic benefits, At present there is only a handful of countries able to independently develop and produce a satellite navigation system. Development and production of our own Beidou satellite navigation system, not just at any time. any, in addition to the geographic location of users to determine latitude, longitude and altitude capability, but the positioning and performance innovations. Used to launch the satellite and launch the "LM-3A" carrier rocket from the China Aerospace Science and Technology Set the company owned the Chinese Research Institute of Space Technology and China Academy of Launch Vehicle Technology Development. This is the 95th flight of long march series of carrier rockets.
Technorati Tags: Beidou, China, Compas Navigation Satellite System, Galileo, GLONASS, GPS, JDAM, Rocket, Russian, Satellite Communications, Satellite Navigation System, United States
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