基于跟踪回路误差限制的惯导辅助载波跟踪回路模式研究

摘要

惯导(INS)对接收机载波跟踪回路的辅助,能够减弱或抵消载体动态影响,降低回路带宽,减少回路跟踪误差,也是实施超紧耦合技术的主要特点.具体分析了FLL和PLL的各组成误差,推导了稳态载波相位误差、载波多普勒频移误差与INS速度误差之间的关系,基于跟踪回路误差的限制和稳定回路的门限,具体给出了在相位辅助和频率辅助两种不同模式下对INS速度误差的限制条件.分析表明,考虑INS辅助精度的影响,采用INS对载波跟踪的频率辅助更具可行性,最后仿真验证了频率辅助的有效性.%INS-aided carrier tracking can reduce or remove effect caused by dynamic,reduce the tracking loop bandwidth,decrease the tracking errors,and the aiding mode is also a main characteristic for ultra-tightly coupled technology.Tracking errors with FLL and PLL are analyzed with details.The relationship between the steady carrier phase error and the velocity error of INS,the carrier Doppler shift error and the velocity error of INS are deduced.Based on the tracking loop errors limit and stability of the threshold,the INS velocity accuracy restrictive conditions are given for the carrier phase-aided and carrier frequency-aided pattern.Considering the effect of INS accuracy,the carrier frequency-aided pattern is more feasible.The simulation results verify the effectiveness of the carrier frequency-aided pattern.