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线性调频波形由于多普勒性能突出 ,一直是一种在雷达中具有广泛应用的脉冲压缩波形 ,但是线性调频的旁瓣不够理想。对线性调频旁瓣结构进行了理论分析 ,指出其主瓣附近旁瓣所具有的逐点倒相特性 ,并据此提出 3点滑窗旁瓣抑制滤波器 ,理论分析及仿真计算表明 ,3点滑窗滤波可以通过灵活的改变参数 ,达到不同的脉压要求 ,信噪比损失大约在 1d B左右 ,而且基本不随多普勒频率增长而变化。该滤波器同样适用于线性调频波形衍生的多相码 (P3/ P4)旁瓣抑制
Chirp waveforms have been widely used as pulse compression waveforms in radar due to their outstanding Doppler performance, but the sidelobes of chirp are not ideal. The theoretical analysis of the sidelobe structure of LFM and the point-by-point inverting characteristic of the side lobe near the main lobe are proposed. Based on this, a 3-point sliding window sidelobe suppression filter is proposed. Theoretical analysis and simulation results show that 3-point Slip-window filtering can be achieved by changing the parameters flexibly to achieve different pulse pressure requirements. The signal-to-noise ratio loss is about 1dB and does not change with Doppler frequency. The filter is also suitable for chirp-derived polyphase code (P3 / P4) sidelobe suppression