Study on range window in HPRF Stepped Frequency radar system

High pulse repetition frequency (HPRF) Stepped Frequency radar can achieve both unambiguous velocity and high resolution ranging in a single dwell, but it need the range window to detect the different interval. This paper presents the principle of range window for Stepped Frequency radars working in the mode of HPRF. The influence of range window on the high range resolution (HRR) profile is analyzed in detail and we have found that the range window may cause a coupling time shift in HRR profile of the target, which may lead to range aliasing. As a solution to this problem, several constraints on the system parameters are proposed. The effectiveness of the proposed method is verified by simulations.