A Sparse-Driven Anti-Velocity Deception Jamming Strategy Based on Pulse-Doppler Radar with Random Pulse Initial Phases

Abstract

This paper focuses on developing an anti-velocity jamming strategy that enhances the ability of a pulse-Doppler (PD) radar to detect moving targets in the presence of translational and/or micro motion velocity jamming generated by the digital radio frequency memory (DRFM) repeat jammers. The strategy adopts random pulse initial phase (RPIP) pulses as its transmitted signal and thus gets DRFM jammers not adaptable to the randomness of initial phase of the transmitted pulses in the pulse repetition interval (PRI) domain. The difference between the true target echo and the false target jamming signal at each PRI is then utilized to recognize the true and false target signals. In particular, an entropy based multi-channel processing scheme is designed to extract the information of the received signal without the assumption that true and false targets must be both included within one coherent processing interval (CPI). Information such as the component of the received signal (target echo only, jamming only or both) or the operating manner of DRFM repeat jammer can be gained (if jamming exists). Meanwhile, we solve the false target recognition problem under sparse theory frame and our previous work named the short-time sparse recovery (STSR) algorithm is introduced to recover the motion parameters of the true and/or false targets in the time-frequency domain. It should be pointed out that both the translational false target jamming and micro motion target jamming can be recognized in our strategy. The performance of the proposed strategy is compared with the correlated processing (CP) method used by most extant strategies. It is shown that the proposed strategy can successfully recognize the existence of true and/or false targets and keep its power in recovering corresponding motion parameters even when the jamming environment is strong.

Method of High Signal-to-Noise Ratio and Wide Swath SAR Imaging Based on Continuous Pulse Coding

“…V is the speed of the radar platform. s T is the time of the synthetic aperture of the radar, which can be calculated by (12).…”

“…Different modulation methods have different effects on the performance of the radar system. For example, adding a random initial phase to the pulse signal [9]- [12], adjusting slightly the modulation frequency of signal [13]- [15] or changing the polarity of the modulation frequency rate [16]- [17], using multi carrier signal [18]- [21] are all effective ways to suppress interference. Besides, radar waveform coding method is also applied to clutter suppression [22]- [24], resolution enhancement [25]- [29], range and azimuth ambiguity suppression [30]- [34].…”

Generating randomness: making the most out of disordering a false order into a real one

“…The strategy uses random-pulse initial phase pulses as its transmitted signal and derives memory jammers that are not adaptable to the randomness of the initial phase of the transmitted pulses in the pulse repetition interval domain. An entropy-based multi-channel processing scheme was used to extract the information of the received signal without assuming that true and false targets should be included within one coherent processing interval [25].…”

Application of Hash Function on FMCW Based Millimeter-Wave Radar Against DRFM Jamming

“…However, the anti-interference method in [5] uses a random initial phase when sending signals, which makes the DRFM jammer unable to adapt to the randomness of the initial phase. This polarization radar is mentioned in the article [6].…”