抗转发干扰FFT快速捕获方法研究  

Research on the FFT Fast Acquisition Method to Suppress Repeater Spoofing Interferences

作　　者：龚文飞[1] 孙昕[1] 

机构地区：[1]北京交通大学电子信息工程学院,北京100044

出　　处：《北京理工大学学报》2011年第8期956-961,共6页Transactions of Beijing Institute of Technology

基　　金：北京交通大学基本科研业务费资助项目(2011JBM006)

摘　　要：为了解决有效抑制转发式干扰问题,根据转发干扰信号的码相位滞后于卫星导航信号的特点,结合快速傅里叶变换(FFT)快速捕获的二维搜索策略,提出基于延迟-等待捕获策略的抗转发干扰FFT快速捕获方法.该方法根据过门限峰值的码相位信息来区分判别卫星导航信号和转发干扰信号,在不影响接收机在无转发干扰正常工作的条件下,保证了接收机在转发干扰下的捕获性能.理论分析和仿真实验验证了该方法的有效性.The problem of suppressing the repeater spoofing interferences effectively has become a must for the design of military anti-jamming satellite navigation receivers. By analyzing the code phase characteristic of satellite signals and repeater spoofing interferences, this research proposes a method of FFT fast acquisition of long code based on delay waiting strategy. The method distinguishes satellite signals from repeater spoofing interferences according to the code phase information of the correlation peak whose amplitude is above the threshold. Thus the acquisition performance in the scene of repeater spoofing interferences can meet the demand without degradation in normal conditions. The theory analysis and simulation results validate the effectiveness of proposed method.

关 键 词：转发式干扰 卫星导航 FFT快速捕获 抗干扰 

分 类 号：TN914.42[电子电信—通信与信息系统]