卫星导航接收机跟踪环路自适应切换研究  

Study on Adaptive Switching of Tracking Loop of Satellite Navigation Receiver

作　　者：张文杰 ZHANG Wen-jie(Science and Technology on Communication Information Security Control Laboratory,Jiaxing Zhejiang 314033,China;No.36 Research Institute of CETC,Jiaxing Zhejiang 314033,China)

机构地区：[1]通信信息控制和安全技术重点实验室,浙江嘉兴314033 [2]中国电子科技集团公司第三十六研究所,浙江嘉兴314033

出　　处：《通信对抗》2023年第3期15-19,23,共6页Communication Countermeasures

摘　　要：干扰环境与功率增强变化等条件势必会影响卫星导航信号载噪比的稳定性。对卫星导航接收机而言,信号强弱交替极有可能导致原本处于锁定状态的接收机失去对某颗卫星信号的锁定。此时如何实现对失锁信号的快速重捕获将会直接影响到后续定位结果的准确性和连续性。通过研究弱信号的捕获与跟踪原理,分析了卫星导航信号变化对接收机环路相关影响,基于卫星导航信号双频特性设计了卫星导航接收机跟踪环路自适应切换方法,并通过实验验证了环路的可靠性。自适应环路能保证在复杂环境下对信号的持续跟踪,提高了卫星导航接收机快速捕获与定位能力。Satellite navigation signal in the interference environment and power enhancement changes and other conditions are bound to cause the signal carrier-to-noise ratio stability.For the satellite navigation re-ceiver,the alternation of strong and weak signals is very likely to cause the receiver that was originally in a locked state to lose the lock on a satellite signal.At this time,how to achieve the fast recapture of the lock-out signal will directly affect the accuracy and continuity of the subsequent positioning results.By Studying the principle of weak signal acquisition and tracking,this paper analyzes the influence of satlite navigation signal changes on the receiver loop.Based on the dual-frequency signal of satellite navigation signal,this paper de-signs an adaptive switching method for the tracking loop of satellite navigation receiver,and verifies the reliabil-ity of the loop through experiments.The adaptive loop ensures the continuous tracking of signals in complex environment,and improves the rapid acquisition and positioning capability of the satellite navigation receiver.

关 键 词：卫星导航 功率增强 弱信号 捕获跟踪 环路切换 

分 类 号：TN967.1[电子电信—信号与信息处理]