Peak sidelobe level (PSL), integrated sidelobe level (ISL) and signal to noise ratio (SNR) are the main performance indices in pulse compression radar. Pulse compression is useful in providing two contradicting requirements, namely, higher transmitted power required for longer pulse transmission, and smaller range resolution which is a desirable characteristic of smaller pulse transmission. The sidelobe suppression method proposed in this paper is based on the correlation processor that uses the P4 polyphase codes. P4 codes are known for their better Doppler tolerant property. Sidelobes are undesirable as jammers or noise present in sidelobes may interfere with the desired target. The proposed method has been implemented with six different windows namely Hamming, Hanning, Blackman, Nuttall, Blackman–Nuttall, and Blackman–Harris and results show that PSL value of − 275.6 dB and ISL value of − 152.98 dB are achieved without much degradation in SNR value. Ambiguity function is derived for the designed sequence and the results are compared with the Frank, Barker and P4 code in the delay-Doppler plane. Results show that the proposed method provides significant performance improvement compared to existing sidelobe suppression methods.

峰值旁瓣电平（PSL），积分旁瓣电平（ISL）和信噪比（SNR）是脉冲压缩雷达的主要性能指标。脉冲压缩可用于提供两个相互矛盾的要求，即较长的脉冲传输需要较高的传输功率，而较小的范围分辨率则是较小的脉冲传输的理想特性。本文提出的旁瓣抑制方法基于使用P4多相码的相关处理器。P4码以其更好的多普勒容错特性而闻名。旁瓣是不受欢迎的，因为旁瓣中的干扰或噪声可能会干扰所需的目标。所提出的方法已在六个不同的窗口中实施，这些窗口分别是Hamming，Hanning，Blackman，Nuttall，Blackman-Nuttall，Blackman–Harris和Blackman–Harris的结果表明，PSL值为-275.6 dB，ISL值为-152.98 dB，而SNR值没有太大的下降。针对所设计的序列导出歧义函数，并将结果与​​延迟多普勒平面中的Frank，Barker和P4码进行比较。结果表明，与现有的旁瓣抑制方法相比，该方法可显着提高性能。