一种基于小波相关滤波的无线电干涉测量处理方法

A Radio Interferometry Processing Method Based on Wavelet Correlation Filter

针对深空探测中干涉测量微弱信号相关处理问题,提出了一种基于小波滤波的无线电干涉测量方法。首先,在小波相关滤波算法分析的基础上,提出了基于移位相关、逆序处理以及最高层小波系数阈值处理的改进算法;其次,分析并构建了深空探测宽带信号模型,并给出了基于小波相关滤波的无线电测量方案;最后通过蒙特卡洛仿真和实测数据处理证明小波相关滤波可以改善无线电干涉测量精度,其中同步卫星群时延估计精度改善约10%。

A radio interferometry method is proposed to resolve the problems of the process of weak spacecraft signal received in deep space exploration.Firstly,based on the analysis of the original wavelet correlation filter,an improved one is proposed which contains shift correlation,the processing order from higher scale to lower one and the threshold filtering of the highest scale coefficients.Secondly,the wide band signal model in deep space exploration is analyzed and constructed,and the radio interferometry scheme based on wavelet correlation filter is provided.Finally,results of Monte Carlo simulation and data processing for some GEO satellite measured signal prove a better performance of the interferometry measurement,and the group delay accuracy of the GEO satellite is improved by 10%.