Study on range sidelobe suppression techniques of biphase coded signals based on the processing in frequency domain

This paper studies the range sidelobe suppression techniques for long-biphase coded signals by applying digital processing in Frequency domain. By analyzing the spectrum characteristics, a design method in frequency domain for Sidelobe Suppression Filters (SSF), which is suitable for various code lengths and different code sequences, is presented. As an example, computer simulations and experimental results of 127-bit biphase coded signals processed by the SSF are also given. When fd = 0, RMS are achieved to 50dB and 43dB for simulations and experiments respectively. These show that biphase coded signal SSF designed by this method can be applied in modern radar systems, and the satisfactory performance are achieved.