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Test satellite
Test satellite is also called prototype satellite. The satellite weighs 774kg (including 310kg fuel) and has a design life of 5 years. In order to meet the needs of solution and the needs of the entire system test and improvement, the United States has launched 11 test satellites from the Vanden Fort Air Force Base in California from 1978-1985. The seventh satellite launch failed and did not enter the scheduled track. At the end of 1995, the last test satellite stopped working [5].
(2) Work satellite
The Block II satellite weighs about 1.5T and has a design life of 7.5 years. Each satellite costs $ 48 million. From February 1989 to October 1990, 9 BLOCK II satellites were launched from the Kenavila Space Base in Florida. Compared with the test satellite, the Block II satellite has made many improvements. The satellite can store the 14 -day navigation electrical text and has the ability to implement SA and AS. The Block II satellite (A: Advanced) weighs about 17T, the satellite design life is 7.5 years, and the satellite has the ability to communicate with each other. The ability of satellite storage and navigation electrical essays has increased to 180 days. SVN35 and SVN36 satellites are equipped with laser reflex prisms. They can analyze the errors of satellite clocks and satellite stars by laser ranging, and test the accuracy of GPS ranging. The size of the reflective prism is 24cm × 20cm
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