存在自干扰码时的短周期伪码截获技术

针对伪码截获这一无线电侦察和导航战中的难题,从模式识别的角度研究存在自干扰码时的伪码截获问题。通过对干扰码的载波频率、相位等参数的估计和补偿,将自干扰码下的伪码截获问题转换为模式识别问题。结合伪码的周期性,采用二进制积累的方法大大降低了判决前所要求的信噪比,使得对扩频信号直接解调以截获伪码成为可能,改变了过去依靠大口径天线提高信噪比的方法。

Short Period PN Code Capture Technique with Self-jamming Code

PN code capture is a difficult problem in radio reconnaissance and navigation warfare.The PN code capture under self-jamming code was studied from the point view of pattern recognition theory.The carrier frequency and phase of self-jamming code were estimated and compensated firstly.Thus the PN code capture was converted into pattern recognition problem.Combined with the periodicity of the short PN code,binary integration was introduced to reduce the SNR before decision,which made the direct demodulation of spread spectrum signals feasible without large diameter antenna.