雷达对抗侦察中基于广义似然比检测的子带频谱检测算法

根据雷达对抗侦察接收信号的特点,提出了基于动态非均匀信道化滤波的接收结构.重点研究了其中的频谱感知环节,提出了基于广义似然比检测的子带频谱检测算法.该算法首先假设至少含有K个子带不存在信号,再根据K个子带输出估计噪声方差,从而给出了基于广义似然比检测的子带频谱检测算法的检验统计量.对于具有频率先验信息的重点目标,论文给出了基于广义似然比检测快速频谱检测算法.理论分析和仿真表明了算法的有效性.

Generalized Likelihood Ratio Detector Based Subband Spectrum Sensing Algorithm in Radar Countermeasure Reconnaissance

A receive structure of radar countermeasure reconnaissance based on dynamic non-uniform channelization is proposed according to its signal characteristics.A sub-band spectrum sensing algorithm based on generalized likelihood ratio(GLR) detector is proposed.First,a given minimum number K of sub-bands without signal is assumed.Then the noise variance is estimated according to outputs of K sub-bands.At last,a test statistics of sub-band spectrum sensing algorithm is proposed based on GLR detector.A fast spectrum sensing algorithm of an important target with priori frequency information is proposed based on GLR detector.Theory analysis and computer simulation illustrate effectiveness of this sub-band spectrum sensing algorithm.