高灵敏高动态超紧组合跟踪方法探讨  

Discussion on high sensitive and high dynamic ultra-tight integration tracking method

作　　者：吴飞燕 丛丽[1] 万国龙[1] WU Feiyan;CONG Li;WAN Guolong(School of Electronic and Information Engineering,Beihang University,Beijing 100191,China)

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《导航定位学报》2018年第3期5-10,共6页Journal of Navigation and Positioning

摘　　要：针对高动态弱信号场景下GNSS接收机难以实现跟踪的问题,提出一种高灵敏、高动态GNSS/INS超紧组合跟踪方法:用INS辅助载波跟踪环去除环路中大部分动态,接着加长相干积分时间以提高信噪比,并利用FFT鉴别弱信号频率,从而实现对高动态、弱信号的跟踪。实验结果表明:用低精度IMU在弱信号场景下逐渐增加动态,高灵敏高动态跟踪环路可以跟踪的最大动态均远远大于高灵敏环路可以跟踪的最大动态;该方法可显著提升环路的动态跟踪性能,使得高灵敏高动态环路可以在弱信号、高动态情况下正常跟踪。Aiming at the problem that it is difficult for GNSS receiver to track signals under high dynamic and weak signal environments,the paper proposed a high sensitive and high dynamic GNSS/INS ultra-tight integration tracking method:INS was used to aid the carrier tracking loop for removing most of the dynamics,and the coherent integration time was increased to improve the signal-to-noise ratio,then FFT algorithm was used to identify the weak signal frequency,finally the high dynamic and weak signals were tracked.Experimental result showed that the maximum dynamics that could be tracked by high sensitive and high dynamic tracking loop with the IMU of low precision under the environment of increasing dynamics with the weak signals would be far more than that by high sensitive tracking loop;moreover,the proposed method could help improve the dynamic tracking performance of the loops,which would enable the high sensitive and high dynamic tracking loops to track with high dynamic and weak signals.

关 键 词：弱信号 高动态 相干积分时间 FFT鉴频 超紧组合 INS辅助 

分 类 号：P228[天文地球—大地测量学与测量工程]