A Method against Interrupted-Sampling Repeater Jamming Based on Energy Function Detection and Band-Pass Filtering

Hui Yuan,Xin Li,Lei An,Chun-Yang Wang

doi:10.1155/2017/6759169

Abstract

Interrupted-sampling repeater jamming (ISRJ) is a new kind of coherent jamming to the large time-bandwidth linear frequency modulation (LFM) signal. Many jamming modes, such as lifelike multiple false targets and dense false targets, can be made through setting up different parameters. According to the “storage-repeater-storage-repeater” characteristics of the ISRJ and the differences in the time-frequency-energy domain between the ISRJ signal and the target echo signal, one new method based on the energy function detection and band-pass filtering is proposed to suppress the ISRJ. The methods mainly consist of two parts: extracting the signal segments without ISRJ and constructing band-pass filtering function with low sidelobe. The simulation results show that the method is effective in the ISRJ with different parameters.

Highlights

Interrupted-sampling repeater jamming (ISRJ) [1] based on the digital radio frequency memory (DRFM) technology is a new kind of smart jamming, which aims especially at the linear frequency modulation (LFM) signals with large timebandwidth product
Compared with the ISRJ with fixed repeat sampling interval, interrupted-sampling and periodic repeater jamming and interrupted-sampling and successive repeater jamming can form a mass of lifelike false targets and have obvious advantages in fidelity and amount of false targets, flexibility of system, computation burden, and requirement of hardware environment [13]
There will be large error using the above methods of determining the threshold value and extracting the signal segments not disturbed by the ISRJ signal

Summary

Introduction

Interrupted-sampling repeater jamming (ISRJ) [1] based on the digital radio frequency memory (DRFM) technology is a new kind of smart jamming, which aims especially at the linear frequency modulation (LFM) signals with large timebandwidth product. According to the discontinuity in time domain of the ISRJ signal, Gong et al [21] have proposed an effective ECCM scheme for eliminating the ISRJ-based false targets from the pulse compression result based on the timefrequency analysis method. A new method against the ISRJ is proposed based on the “storage-repeater-storage-repeater” characteristics of the ISRJ and the differences in the time-frequencyenergy domain between the ISRJ signal and the target signal.

Signal Model and Properties on Time-Frequency-Energy Domain

ECCM Scheme against ISRJ

Simulations

Conclusions