A New Biphase Coding LFM for Pulse Compression Radar

Linear Frequency Modulation (LFM) waveform becomes widespread in modern pulse compression radar systems in order to improve its target range resolution capability. Conventional LFM based on varying the waveform frequency linearly within the radar pulse width which leads to high Auto Correlation Function (ACF) with limited compression ratio (CR) and side lobe level (SLL). This paper proposed Optimized Biphase Pulse Compression Codes (OBPCC) with the LFM waveform. Frequency and phase coding have been used to achieve optimum (SLL) and (CR) using Genetic algorithm (GA). The results compare the ACF for both LFM and phase coded (PCLFM). Set of codes are generated for code length of 51 with frequency modulation index from 0.002 to 0.009. Peak sidelobe level from -18.89 dB to -19.33 dB is achieved. The results obtained show superiority of PCLFM over the conventional LFM which improves the compression ratio by 9.95 times the conventional LFM.