Experts said the Beidou, or JDAM munitions to help the PLA has made
Data Chart: US-made JDAM Joint Direct Attack Bomb
positioning accuracy currently reached 25 meters, to look forward to the future prospects for military use
12 27, the State Council Information Office held a press conference. Beidou satellite navigation system spokesman, China’s satellite navigation system management office Ran commitment announced in the conference, the Beidou navigation system 27 to provide a formal test run, which began in China and surrounding areas to provide continuous navigation and timing services.
According to him, with 10 satellites in the current circumstances, to carry out the Big Dipper’s commissioning services is mainly based on two considerations: First, as soon as possible to meet our country and the surrounding areas the demand for satellite navigation; Second, as soon as possible to promote the application of the Big Dipper. Service during the test run, about 25 meters accuracy location services. By the end of next year, will provide a formal system built to run basic services, then the coverage area positioning accuracy can reach 10 meters.
by Compass traveled the world
Beidou satellite navigation system has four main functions: navigation and positioning, speed, messaging, timing functions. Which is the combination of text messages and Chinese Beidou navigation satellite navigation system, a unique invention.
Ran Cheng, according to its introduction, in addition to the Big Dipper, the present world there are three satellite navigation systems: the U.S. GPS system and Russia’s GLONASS system and the European Galileo system. GPS system is the world’s first global satellite navigation system set up, regardless of the maturity of the system, service accuracy, are in the most advanced level. Russia’s GLONASS system is being restored, has been basically completed, will provide the appropriate services. Galileo is under construction, has not yet provided a formal service.
Ran Cheng said its Beidou satellite navigation systems and satellite systems, the other three are not exactly the same. China built the first Beidou satellite navigation experimental system, active positioning and short message service features, to resolve whether the Chinese satellite navigation systems. SMS is the Beidou satellite navigation experimental system characteristics, but also the advantages of the Big Dipper. This feature lets you know at what time, what place, you can also send your location out. “It solves the who, what, where, and that is why you can rely on a terminal Compass traveled the world.”
for the Chinese military Fangtian Li device
According to the State Council Information Office website, although the Beidou satellite navigation system satellite network is still in a critical stage, but the system has been successfully used in mapping, telecommunications, transportation, forest fire prevention, disaster relief and other areas. However, according to an unnamed Chinese space experts on the “News of the World,” said the Beidou navigation system compared to the value of civilian, military use of its prospects for the future to look forward to.
the experts to get an American GPS global satellite positioning system, for example, is actually encoded into the GPS military and civilian two. In exceptional circumstances, in order to ensure national security, the U.S. military will take three measures to deal with emergency situations: First, reduce the other side of the navigation accuracy; Second, transform coding at any time; third for regional management. In other words, the above three ways, the U.S. military can restrict the use of domestic and foreign users of GPS.
the U.S. military, the U.S. is the GPS global satellite positioning system, an important function is to protect the U.S. military command and operations automation. GPS is currently widely used in the world, most countries have their dependencies, which means that, at present, any GPS satellite navigation system with a national army, the U.S. war are likely to be “playing the hands and feet” and become “blind.”
The expert pointed out that with the Big Dipper and put into large-scale network, China will gradually get rid of the United States rely on GPS satellite positioning system, has important military significance. For example, the Beidou system to be mature, such as China owns the U.S. military can “Joint Direct Attack Munition (JDAM)” as the satellite-guided precision weapons, and the cost of such weapons is much lower than other precision-guided weapons.
2020 年 Beidou global coverage
Ran Cheng, according to its introduction, the Beidou satellite navigation systems worldwide all-weather, all-time high accuracy for all types of users , highly reliable positioning, navigation and timing services, and both short-message communication capabilities. At present, China is in accordance with “three-step” development strategy of the system steadily.
first step is to pilot phase, which uses a small amount of use of geostationary satellite orbit to complete the test task, for the construction of the Beidou satellite navigation system the accumulation of technical experience; second step is to 2012, plans to launch 10 satellites satellite, covering the Asia-Pacific region into a satellite navigation system; The third step is to 2020, built by the five geostationary orbit and 30 non-geostationary orbit satellite network from the global satellite navigation system.
2000-2003 China’s successful completion of the “three steps” first step. Current Beidou system has 10 satellites, the main performance during commissioning services for the service area 84 degrees to 160 degrees east longitude, 55 degrees south latitude to 55 degrees north latitude and between most of the area, position accuracy of up to plane 25 meters, height 30 m , speed accuracy of 0.4 meters per second, timing accuracy of 50 nanoseconds. Network according to the second step launch plan, next year also launched six satellite network, then “three steps” of the second step will be fully completed, Compass will be covering most parts of the Asia-Pacific service capacity, coverage area positioning accuracy can reach 10 meters. The third step is completed around 2020, when the Big Dipper will form a global reach. (Wu Tao)