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"�� Try buy GPS Navigator offers �� ��" QQ; 1204013352 �� �� �� not open page pls click �� �� Baidu snapshot �� this company specializes in portable Navigator, and other products, to undertake QQ; 1204013352 Tel: 15960274756 as 09, April 15, the second "Beidou 2" navigation satellite in Xichang satellite launch Center for the "long March 3 c" launch success, China sky navigation satellite reaches six. Beidou navigation satellite 4 stars, the Beidou navigation satellite, 2 2 stars, but according to the life, the Beidou navigation satellite has two has already expired, so now I guess, now operating in the Beidou navigation satellite estimates it 4 stars. Space Super compass navigation is required for human society. From ancient times to the present, human life in production and in practice various navigation methods were invented. For example, celestial navigation is by observing the position of the celestial bodies to determine the location and the course itself, this simple method of device, subject to weather conditions; radio navigation is receiving coast radio station radio wave issued to determine the location of the ship itself, it is not subject to the influence of weather conditions, but because the radio waves propagation distance limited, it is difficult for sailors. Other navigation methods also unsatisfactory. From the current level of technology and the foreseeable future, satellite navigation technology is an ideal navigation tool. Navigation satellite radionavigation is actually placed in the satellite, to increase the coverage and, therefore, be able to overcome the ground radionavigation transmission distance limited natural enough, and is not subject to weather conditions, navigation accuracy is also relatively high. According to its signal coverage, satellite navigation and positioning systems can be divided into regional satellite navigation and positioning system (GPS) and global satellite navigation system. China has launched, the construction of "Beidou" navigation test satellite system is the area of satellite navigation and positioning system, currently in orbit of United States ' global positioning system (GPS), Russia's "global navigation satellite system (GLONASS) is the global navigation and positioning system. Rdss not lost 31 October 2000 and 21 December, 2003, may 25, 2007 to February 3, China's long March in Xichang satellite launch Center with A launch vehicle, 3, has successfully 4 stars "Beidou" navigation test satellite into space. This indicates that China has independent perfect satellite navigation system, the construction of China's economy has played a positive role. Although United States GPS navigation satellite has been widely used, but it is by no means perfect. For example, its size is too large, the cost is too high, it is difficult to follow the example of other countries; GPS navigation only, not communication, and therefore does not meet the growing needs of users; if you only rely on GPS, it is vulnerable to the United States. So, is there a solution to these problems in new ways? China "Beidou" navigation satellite opened a new way, and allow China to become the world's third countries with satellite navigation. "Beidou" test satellite navigation systems from "Beidou" navigation test satellites, ground control center of the ground segment and Terminal Dou users. The system is the way to work rdss, there is also a star in-orbit back-up. With two satellite navigation systems is established United States Figgjo star company first put forth by the United States and Europe, but the company's development work have failed, but the Chinese first realized this satellite navigation and positioning of the innovation project. "Beidou" navigation test satellite for the four satellites operating in geostationary orbit, the design life of 8 years, can provide all-weather, all-weather satellite navigation information, with the short cycle time, less investment and have the characteristic features, etc. The satellite navigation system with active navigation, bi-directional digital message communication and precision timing three functions for the service area of the user to provide 24/7, real-time positioning services, positioning accuracy and GPS is in China and the surrounding region as a soldier, vehicles, ships and aircraft, and other users with an accuracy of 20 to 100 m of positioning services; use it once to transfer up to 120 characters of information; the timing precision of up to 20 nanoseconds. So it can be widely used in transportation, marine work, logistics management, forest fire prevention, disaster prediction, meteorology, oceanography, petroleum, communication and public security, and other special industries. China Academy of space technology also developed several models of Beidou satellite navigation test # 1 positioning Terminal, provided to different users, the main products include mounted seriesdifferent installs the user machine, shipboard-user machines, regular users machine, communications-user machines, portable user machine and command-user machine. The satellite navigation system and the system of the United States and Russia the largest difference is that it not only enables users to know their location, you can let others know your location, particularly suitable where navigation and mobile data communication with users, such as transportation, scheduling, search, rescue and geographic information real-time queries, and so on. The perfect "Beidou" satellite navigation system in 2007, the 14 April, China's long March 3, A rocket successfully launches first "Beidou" navigation satellite. The satellites flying in height 21500 km circular orbit in the Chinese developed "Beidou" satellite navigation and positioning system has entered a new stage of development. China will in the next few years successively launched series "Beidou" navigation satellite, start building owns independent intellectual property rights of satellite navigation systems �� "Beidou" satellite navigation system. The system offers two services, open services and authorized services. Open service is provided free of charge in the service area positioning, velocity and time service. 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