Abstract
Interrupted sampling repeater jamming (ISRJ) is an effective way of deceiving coherent radar sensors, especially for linear frequency modulated (LFM) radar. In this paper, for a simplified scenario with a single jammer, we propose a dynamic electronic counter-counter measure (ECCM) scheme based on jammer parameter estimation and transmitted signal design. Firstly, the LFM waveform is transmitted to estimate the main jamming parameters by investigating the discontinuousness of the ISRJ’s time-frequency (TF) characteristics. Then, a parameter-adjusted intra-pulse frequency coded signal, whose ISRJ signal after matched filtering only forms a single false target, is designed adaptively according to the estimated parameters, i.e., sampling interval, sampling duration and repeater times. Ultimately, for typical jamming scenes with different jamming signal ratio (JSR) and duty cycle, we propose two particular ISRJ suppression approaches. Simulation results validate the effective performance of the proposed scheme for countering the ISRJ, and the trade-off relationship between the two approaches is demonstrated.
Highlights
Interrupted sampling repeater jamming (ISRJ) is a recently-developed, efficient, active jamming method [1,2,3] for radar sensors
Through low-rate interrupted sub-sampling, ISRJ is able to produce a series of coherent false targets in the pulse compression result of the radar receiver without sampling and storing the whole radar pulse, in contrast to traditional jamming approaches
On the one hand, based on the traditional liner modulated frequency (LMF) radar, there has been sporadic research about electronic counter-counter measure (ECCM) for ISRJ, most of which focuses on the radar receiver to develop signal processing and jamming recognition methods
Summary
Interrupted sampling repeater jamming (ISRJ) is a recently-developed, efficient, active jamming method [1,2,3] for radar sensors. Through low-rate interrupted sub-sampling, ISRJ is able to produce a series of coherent false targets in the pulse compression result of the radar receiver without sampling and storing the whole radar pulse, in contrast to traditional jamming approaches. This method has great advantages due to its adoption of the receive-transmit time-sharing antenna system, which significantly ameliorates the response speed and analog-to-digital (AD) sampling rate of the jammer. On the one hand, based on the traditional liner modulated frequency (LMF) radar, there has been sporadic research about ECCM for ISRJ, most of which focuses on the radar receiver to develop signal processing and jamming recognition methods.
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