(2015卫星导航)局部最大延迟检测抗转发欺骗干扰算法

存在窄带干扰情况下,接收机在进行干扰抑制后,其输出信号的相关峰会发生分裂,使用传统的基于信号传输时延的抗转发欺骗干扰方法,会使得捕获锁定的相关值在真实信号的旁瓣。针对该问题提出了一种基于局部相关值最大的信号时延检测方法,在真实信号相关峰分裂产生的旁瓣与欺骗信号不重合前提下,通过对两个码片范围内最大值的搜索,保证捕获不会锁定在旁瓣,再通过选择局部最大值中最早码相位点来避免锁定到转发欺骗干扰。与传统的方法相比,在无窄带干扰情况下,其与基于信号传输时延的抗转发欺骗干扰方法性能相当,在存在窄带干扰情况下其性能明显优于传统的基于信号传输时延的抗转发欺骗干扰方法。通过数值仿真验证了本文方法的有效性。

The Delay-Waiting Detection Method based on Local Maximum to Suppress Repeater Spoofing Interferences

A large side-lobes will be formed in the output of correlator after rejecting narrow-band interface. Use the traditional method based on the delay of the repeater jamming will be locked on the side-lobes. This paper presents a new method based on local maximum value. As a prerequisite, to ensure the side-lobes do not superpose the repeater jamming , to prevent capture module from locking side-lobes, and it also choose the earliest code-phase from those local maximum to remove repeater jamming. Compare with traditional method, the performance is same in the absence of narrow-band interface, but it is significant improve the performance in the narrow-band interface condition. The simulation results validate the theory analysis.