Radar target echo cancellation using interrupted-sampling repeater

Abstract

A method of using Interrupted-Sampling Repeater Jamming (ISRJ) to cancel radar target echo is proposed. After the principles of ISRJ are expounded, three conditions that should be met for radar echo cancellation are proposed, including range synchronization, phase coherent and amplitude match. Then, the restriction for key parameters of ISRJ, i.e. the repeater power, the delay time and frequency of repeater are deduced in theory. At last, the influences of those parameters on radar echo cancellation are discussed in detail. Some numerical results are presented to verify the effectiveness of this method. This work is beneficial to the jamming design and use of ISRJ.

Improved ISRJ-Based Radar Target Echo Cancellation Using Frequency Shifting Modulation

“…In this section, the performance of the proposed method is analyzed by simulations. For convenience, the existing method proposed in [23] is named as Method 1, and our improved method proposed in Section 3 is named as Method 2.…”

“…For self-protection jamming, the 0 order target lags behind the target echo due to the unavoidable repeater time-delay. Thus parameters of −1 order false target are designed to cancel the target echo [23].…”

“…For linear frequency modulation (LFM) pulse compression radar, ISRJ can produce a train of false targets with controllable amplitudes and phases. Based on this phenomenon, a radar target echo cancellation method using self-protection ISRJ is proposed [23,24]. By designing the interrupted sampling frequency, the repeater time-delay and the jammer power, the ISRJ signal not only ideally cancels radar target echo with −1 order false target, but also produces a train of false targets.…”

“…This protects the jammer equipment effectively. On the other hand, interrupted sampling frequency should be precisely designed according to radar signal parameters as noted in [23], so the position of the false targets produced by ISRJ remains fixed in the radar MF output, which makes it easier to be countered [26].…”

A dual-antenna active-echo-cancellation method for synthetic aperture radar

“…An experimental demonstration of similar concepts called active cloaking has been presented, using a formula based on the equivalence principle [11]. Interrupted-sampling repeater was proposed to cancel the ideal point target [12]. A three-stage AEC method is proposed utilizing the frequency modulation [13].…”