INS辅助的GNSS接收机信号捕获性能分析

针对信号捕获过程中Doppler频移造成的影响,采用INS辅助的GNSS信号捕获方法,分析了INS辅助后卫星信号捕获的性能。利用INS速度误差方程与Doppler误差之间的关系,分析INS辅助后的捕获性能,并通过性能参数的比较,理论上验证了INS辅助后的捕获能力的提升。仿真结果表明,INS辅助能够有效提高信号捕获的检测概率和对弱信号的捕获能力,并大幅减小平均捕获时间。同时,考虑到INS器件参数的关键性作用,采用战术级的INS器件完全满足工程需求。

Performance Analysis on Signal Acquisition of INS-aided GNSS Receiver

Aimed at compensating the influence of Doppler frequency error during acquiring process,the INS-aided GNSS signal acquiring method is adopted. Performance of acquiring satellites signal with the INS-aided is analyzed,with the relationship between INS velocity errors'equations and Doppler error. Comparing the several performance and parameters,the performance with INS-aided effectively can improve the acquiring ability is verified theoretically. Simulation results show that the aided acquiring method with INS enhance the detection probability and detection of weak signals than the unaided,the average acquisition time is decreased greatly. Meanwhile considering the key function of INS accuracy,the tactical INS components is chosen,which will meet real engineering demand.