提高卫星信号模拟器精度的伪距补偿方法
首发时间:2012-07-30
摘要:卫星信号模拟器作为导航接收机开发和验证的重要工具,其精度的提高对检测导航接收机的灵敏度、PVT解算效果有重大的意义。实现过程中,准确把握导航电文与观测数据的时间对应关系以及降低NCO累计误差,对模拟源的精度有很大的提高。本设计利用初始伪距值和间隔2ms的伪距值分别达到了时间统一和NCO相位补偿的目的。在MATLAB中加以验证,在FPGA中实现其方案。测试表明,伪距相位补偿后的解算高度有38米的提高,而且高度一直很稳定的持续在0.3米的误差之内,极大的提高了模拟源的精度。
关键词: 卫星信号模拟器 伪距 时间统一 NCO相位补偿 导航接收机
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The pseudo-range compensation for improving satellite signal simulator accuracy
Abstract:As an important tool of development and validation for navigation receivers, it is of great significance for satellite signal simulator to improve the accuracy to the sensitivity of navigation receivers and the PVT result. In realization, an accurate grasp of the timing correspondence between the navigation and observation data and reduce the cumulative error of NCO can significantly improve the accuracy of the simulator. In this design, initial pseudo-range value and the pseudo-range values with interval of 2ms are used for the purpose of time unity and NCO phase compensation. It is verified in MATLAB and implemented in FPGA .Tests show that the solver height with pseudo-range compensation has a 38m improvement. Moreover, the height is kept within an error of 0.3m. The pseudo-range compensation greatly improves the precision of of the simulator.
Keywords: satellite signal simulator pseudo-range time unity NCO phase compensation navigation receivers
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