Use of a time-staggered FMCW signal for portable high-frequency surface wave radar

摘要

Herein is proposed a low-power-density signal based on time-staggered frequency modulated continuous waveform (TS-FMCW) for portable high-frequency (HF) radar. According to the principle of pulse compression that the signal-to-noise ratio (SNR) is related to the total energy, the proposed signals can carry more energy to get higher SNR within same level power density in time-frequency plane. The range grating lobes and Doppler grating lobes shown in the ambiguity function of our proposed waveform can be avoided in the practical HF radar application. A signal processing architecture containing low-pass filtering and fast Fourier transform is proposed. Experimental results demonstrate that higher SNRs are achievable with the same range and Doppler resolution when the same power density is used as the conventional FMCW.