双曲线调频信号的主瓣不展宽旁瓣抑制方法

摘要

Hyperbolic frequency modulated(HFM) signal is usually adopted in active sonar, while, the matching filter output shows larger sidelobes.The ordinary weighting sidelobe suppression methods cause obviously mainlobe widening, which results in distance resolution worsening.Considering needs of both sidelobe suppression and distance resolution, a sidelobe suppression method without mainlobe widening is proposed in this paper.The theoretical performances of the proposed method are analyzed for HFM.The results show that the proposed method combining with HFM could suppress the sidelobes and the-3dB mainlobe width is not widened, which satisfy both the needs of neighbor highlights discrimination and weak highlight detection.The experiment results of sea trial data demonstrate the validity of theoretical conclusion.The proposed method is valuable in the application of target recognition or key parts location for multi-highlights target.%双曲线调频信号是主动声纳的常用信号,然而,匹配滤波处理后的输出具有较高距离旁瓣.常规加权旁瓣抑制方法造成明显的主瓣展宽,致使距离分辨力下降.为兼顾旁瓣抑制和高距离分辨力需求,文中应用了主瓣不展宽的旁瓣抑制方法.针对双曲线调频信号,分析了该方法的理论性能.结果表明,该方法和双曲线调频信号相结合,可在不展宽-3dB主瓣宽度的同时实现旁瓣抑制,兼顾了近邻亮点分辨和弱亮点探测需求.海试数据试验验证了理论分析结论.在多亮点目标识别及要害部位分辨等应用场合中,该方法具有重要意义.