Phase-coded interrupted continuous waveform for two HF radars sharing the same frequency

Phase-coded interrupted continuous waveform (PCICW) derived from P4 code is presented here for two radars sharing the same frequency. PCICW retains zero sidelobe within the range regions of interest. The transmitted codes from two radars are modulation multiplexed, and the echoes from different transmitters locate at different range regions after correlation computation. This waveform can improve the efficiency of frequency usage, and also make it possible to measure the total velocity through one receiver´s outputs. A design example for two sea remote sensing HF ground wave radars (HFGWRs) is given here.