根据雷达对抗侦察接收信号的特点,设计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,提出了基于拟合优度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,再根据能量最小 的K个子带输出估计噪声方差,用估计的噪声方差标准化各子带输出,从而将子带频谱检测问题转化为子带拟合优度的 检测问题。该算法能够适用于噪声方差未知且无任何信号先验信息情况。理论分析和仿真实验证明了算法的有效性。

A receive structure of radar countermeasure reconnaissance based on dynamic nonuniform channelization is proposed to resolve the problem of its signal characteristics. A subband spectrum sensing algorithm based on goodness of fit test is proposed. First a given minimum number of subbands which is vacant of signal is assumed. Further, the noise variance is estimated by output of subbands of smallest energy out. Then, all output of subbands is standardized using estimated noise variance. The algorithm proposed in this paper is suitable to the situation of unknown of noise variance and priori information of signal. Theory analysis and computer simulation illustrate efficiency of this subband spectrum sensing algorithm.

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