局部最大延迟检测抗转发欺骗干扰算法

接收机在进行窄带干扰抑制后，其输出信号的相关峰会发生分裂。使用传统的基于信号到达时间的抗转发欺骗干扰算法，会使得捕获锁定的相关值为真实信号的旁瓣。针对该问题提出一种基于局部相关值最大的时延检测方法，在真实信号相关峰分裂所产生的旁瓣与欺骗信号不重合前提下，通过对主瓣三个码片范围内最大值的搜索，保证捕获不会锁定在旁瓣，再选择局部最大值中的最早码相位点从而避免锁定到转发欺骗干扰。与传统的基于信号到达时间的抗转发欺骗干扰算法相比，在无窄带干扰情况下，所提算法性能相当；在存在窄带干扰情况下，其性能明显优于传统算法。通过数值仿真验证了方法的有效性。
A large divide will be formed in the output signal of correlator after rejecting narrow-band interface. The traditional anti-interference method based on the time of arrival will be locked on the side-lobes of real signals. To solve this problem, a new delay-waiting detection method based on local maximum value was presented. Under the prerequisite that the side-lobes do not superpose the spoofing signals, the method first searched the local maximum in three chips of main lobes to prevent the capture module from locking side-lobes. Then the earliest code-phase point from those local maximum was chosen to remove repeater spoofing jamming. Compare with the traditional anti-interference method based on the time of arrival, performance of the proposed method is similar in the absence of narrow-band interface, but it is significantly better in the narrow-band interface condition. The numerical simulation results validate the effectiveness of the method.