Description: The purpose of the passive Beidou, is to solve the current Beidou system, there is the number of users limited user machine needs to transmit signals, slow update rate of positioning data shortcomings. Use of the existing two Beidou geostationary satellites and a backup satellite ephemeris information and measuring the time difference information can be deduced from the mathematical model of the passive location. The test data to obtain the positioning results of the 50 m range, which verifies the correctness of the technology
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