The design of a novel coherent noise jammer against LFM radar

Abstract

In this paper, a novel coherent noise jammer is proposed against the pulse compression radar. The algorithm is implemented by modulating the sampled radar signal according to the pseudo-random sequence. A high speed ADC is adopted to sample the baseband radar signal from 50 MHz to 1150 MHz and the parallel data processing in FPGA of Virtex-6 is introduced. The characteristic of the jamming signal in time domain and frequency domain is analyzed in detail. Mathematic expressions indicate that multiple false targets are induced after pulse compression and the real target is protected effectively. Compared with the traditional non-coherent noise jammer, the jamming signal created by our jammer is coherent with the matched filter and is able to obtain some processing gain. Simulation results and the implementation of the proposed method validate the correctness and effectiveness of the design.