Anti-jamming filtering for DRFM repeat jammer based on stretch processing

Abstract

This paper addresses issues about the rejection of false jammer targets in the presence of digital radio frequency memory (DRFM) repeat jammer. An anti-jamming filtering technique is proposed that it can eliminate this type of jamming signal. By using a stretch processing with a particular selected reference signal, the presented method can fully separate the echoes being reflected from the true targets and the signals being re-transmitted by a jammer in frequency domain. Therefore, utilizing the nonoverlapping properties of the received signals, filters or suchlike techniques can be used to reject the undesired jamming signals. Particularly, this method does not require estimation of jamming signal parameters and does not involve a great computation burden. Simulations are given to show the validity of the introduced approach.

Joint range–velocity deception jamming suppression for SIMO radar

“…In [12], a scheme exploiting the variations of the initial phases of transmitted pulses is introduced to suppress velocity deception jamming. In [13], a filtering technique against range deception jamming is proposed, by which the deception signals can be separated from target echoes. In [14], by using pulse diversity, an ECCM scheme is developed to isolate target echoes from range deception jamming.…”

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

“…The antijamming strategy of [4] uses the beat-frequency nonoverlapping properties of the signal in the frequency domain and filters out the interference signal, and this proposed scheme has been the subject of a brief analysis using simulations.…”

Exploiting incoherent sampling to provide electronic protection against digital radio frequency memory jammers

“…Stretch processing is often used in radars to increase range resolution in LFM radars without decreasing the pulse width of the radar. It has also been demonstrated as a potential technique to detect and reject DRFM jammer signals in [12]. In stretch processing a transmit signal with LFM of high bandwidth is used, and unlike typical pulse compression radars, the Local Oscillator (LO) is also swept during the receive period.…”

“…To use this as an EP technique, one simply needs to set-up a low pass filter which, using the Figure 3.1 example, would filter out the highest frequency component shown in the bottom graph. The EP technique and the mathematics defining an appropriate cut-off frequency is presented in [12].…”

“…12 shows, at an abstracted level, the flowchart of the CRN technique simulation. It is broken down into two simulation components: the TVial Control and Simulation Control, which will be discussed individually below.…”