压制干扰对GPS接收机码跟踪环的性能影响分析

压制干扰是GPS接收机面临的重要的人为威胁之一,对伪码跟踪的跟踪测距精度产生影响,甚至导致伪码跟踪环失锁。干扰对伪码跟踪环的影响模型涉及许多因素,建模比较困难。以常用的非相干超前减滞后功率延迟锁定环为例,建立了码跟踪环在宽带噪声干扰、窄带干扰和点频干扰下的跟踪误差模型,比较了压制干扰对C/A码和P(Y)码跟踪环性能的不同影响。通过对不同干扰方式下C/A码和P(Y)码跟踪误差的仿真,得出了对C/A码和P(Y)码跟踪环性能影响较大的干扰方式和干扰频率,为GPS接收机干扰方法和抗干扰措施的选择提供了理论依据。

Analysis of the performance of the code tracking loop of GPS receiver under blanket jamming

As a vital kind of man-made threat faced with GPS receiver,blanket jamming influences measurement error of code tracking,even leads to lose lock of code tracking loop.The foundation of the mode of the impact of jamming is very difficult because of complication.Taking example for the familiar DLL of noncoherent early-late processing,the mode of tracking error based on broadband noise jamming,narrowband jamming and CW jamming is founded and the performance of the code tracking loop of C/A code and P(Y)code under blanket jamming are compared.The simulation results indicated a given jamming mode and jamming frequency exert more influence on the performance of the code tracking loop of C/A code and P(Y)code receiver.It is propitious to the choice of jamming means and anti-jamming measure of GPS receiver.