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在山地及城市附近的应用中,严重的多径杂波造成基于调频广播的无源双基地雷达直达波信号恢复困难。文中提出了采用基于空间分集的常数模盲均衡算法,利用空间分集的多通道,实现信号衰落的补偿,而利用常数模盲均衡算法,实现恒模的调频广播信号的反卷积运算,从而完成了对多径的抑制,获得高质量的直达波信号。计算机仿真表明:与无分集的常数模盲均衡算法相比,所提算法获得了更好的目标检测性能。
In applications near mountainous and urban areas, severe multipath clutter makes it difficult to recover direct-wave signals from passive bistatic radars based on FM broadcasts. In this paper, a constant modulus blind equalization algorithm based on space diversity is proposed, which utilizes multi-channel of spatial diversity to compensate for signal fading, and uses constant modulus blind equalization algorithm to realize constant modulus FM broadcast signal deconvolution. This completes the suppression of multipath and obtains a high quality direct wave signal. Computer simulation shows that the proposed algorithm achieves better target detection performance than the unmodified constant modulus blind equalization algorithm.