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This paper designs the micro GPS/BDS-track recorder based on global positioning system. It used 1t 8051 cores based on STC15 microcomputer as the main control ship, and used VK25BDMT dual module as the navigated and posited cores. The VK25 module can receive the satellite information and solution to get accurate location, time, speed and other information. And it can send the information to the main...
This paper studies the algorithms for determining a BDS satellite's velocity using the broadcast ephemeri. Firstly, by taking the time derivatives of the Kepler orbit elements and the correction terms, the algorithm comprises close-form analysis formulas and the processing steps for directly computing a BDS satellite's instant velocity using the broadcast ephemeris is derived, and its validity is...
The positioning accuracy of GNSS receiver mainly depends the two factors. One is the precision of the ranging, and the other is the geometric distribution of the navigation satellites. In this paper, the User Range Error (URE) is analyzed at first. Secondly, an evaluation method of the URE and the global GNSS positioning accuracy with the precise products, including the satellite ephemeris and clock...
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