利用多相关器的伪码测距多址干扰抑制算法性能分析

Performance Analysis of Multiple-Access Interference Suppression Algorithms for PN Code Tracking using Multicorrelator

伪码跟踪多相关器技术广泛应用于导航接收机抗多径和导航信号质量监测。论文通过对比分析多径和多址信号对导航信号相关峰畸变的影响,揭示了多相关器技术可用于多址干扰抑制。通过仿真分析了多址误差随期望接收信号与干扰信号功率差和载波多普勒频率差的变化规律,并与传统的并行多址干扰对消方法进行了对比。仿真结果表明当多址干扰信号功率差小于10d B时,ELS和Double-delta与单级并行干扰对消方法的性能相当,但是实现复杂度大大降低。

Multicorrelator techniques for PN code tracking are widely used in navigation receiver for multipath mitigation and navigation signal quality monitoring.By comparing the effects of multipath signal on the navigation signal correlation peak distortion with that of multiple access signal,this paper reveals that the multicorrelator techniques can be used for multiple access interference suppression.The variance of multiple access interference errors with various power difference and carrier Doppler frequency difference between the desired signal and the interference signal is analyzed through simula-tion,and compared with the traditional parallel interference cancellation methods.Simulation results show that when the power difference between multi-access interference signal and desired signal is less than 1 0dB,the performance of ELS and Double-delta techniques is the same with the single-stage parallel interference cancellation method,but the implementation complexity is greatly reduced.