Abstract
The interrupted sampling repeater jamming (ISRJ) based on a digital radio frequency memory (DRFM) device is a new type of coherent jamming. This kind of jamming usually occurs as main-lobe jamming and has the advantages of low power requirements and easy parameter adjustment, posing a serious threat to the modern radar systems. In order to suppress the ISRJ, this paper proposes an adaptive transmitting scheme based on a phase-coded signal. The scheme firstly performs jamming perception to estimate the jamming parameters, then, on this basis, optimizes the waveform with genetic algorithm. With the optimized waveform, the jamming signal is orthogonal to the target echo, thus it can be easily suppressed with pulse compression. Simulation experiments are performed to verify the effectiveness of the scheme and the results suggest that the peak-to-side-lobe ratio (PSR) and integrated side-lobe level (ISL) of the pulse compression can be improved by about 16 dB and 15 dB, respectively, for the case where the jamming-to-signal ratio (JSR) is 13 dB.
Highlights
The application of digital radio frequency memory (DRFM) devices has greatly improved the performance and efficiency of radar electronic countermeasures (ECM) systems [1,2,3]
The jamming signal is coherent with the radar transmission and partial processing gain can be obtained from signal processing such as pulse compression and coherent integration, greatly reducing the requirements on transmitting power
0dB.Besides, the can parameters can be accurately estimated when jamming-to-noise ratio (JNR) is greater than 0dB.Besides, the JNR can be further be further by increased by pulse accumulation if the conditions increased pulse accumulation if the conditions permit. permit
Summary
The application of digital radio frequency memory (DRFM) devices has greatly improved the performance and efficiency of radar electronic countermeasures (ECM) systems [1,2,3]. There are two main intercepting modes for DRFM devices, i.e., full-pulse sampling mode and interrupted sampling mode Based on the latter, an ISRJ jammer intercepts parts of the radar signal and retransmits them for several times at a current pulse repeat interval (PRI). ISRJ was first proposed by [9,10] in 2006, respectively (it was named as Chopping & Interleaving (C&I) jamming in [9]) According to these references, the jammer intercepts a slice of the radar transmission and retransmits it multiple times. The scheme first carries out jamming perception to estimates the ISRJ parameters of jammer intercepting positions and intercepting durations, performs waveform optimization with the estimated jamming information. The main notations used in this paper are defined in the following table (Table 1)
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