A review of radar signals in terms of Doppler tolerance, time-sidelobe level, and immunity against jamming

Abstract

Pulse compression technique allows a radar to achieve the resolution of a short pulse and the energy of a long pulse simultaneously, without the requirement of high-power transmission. Therefore, pulse compression radars have a low probability of intercept capability. The common types of pulse compression signals are frequency modulated waveforms and phase-coded waveforms, which have different properties. The optimum radar signal should have good immunity against deceptive jamming, good Doppler tolerance to detect high-speed targets, and low time-sidelobe level to detect weak targets nearby the strong ones. This paper reviews the current research in the commonly used radar signals, and presents their pros and cons, and compares between them in terms of Doppler tolerance, time-sidelobe level, as well as immunity against jamming in order to provide a reference for the researchers in the field of radar systems and electronic warfare.

Doppler Robustness of Joint Communication and Radar Systems Using the Wiener Filter

“…When the signal is also used for radar applications, the question that arises is what is the acceptable Doppler shift the radar system can support with low performance degradation. This question has already been tackled in the literature [11], [19], but we provide the first analytical derivation and a simple expression to calculate this degradation. Before answering this question, the radar system is presented.…”

“…Benmeziane and K. Cinglant are with ZF Autocruise, 29280 Plouzané, France of the delay-Doppler response, and reduces the detection capabilities [9]. The radar performance impacted by the Doppler shift has already been evaluated in the case of the studied OFDM signal [10], [11]. All these results are based on simulations and no link is drawn between the two parts of the JRC system, according to our knowledge.…”

Countering self‐protection smeared spectrum jamming against chirp radars

“…Let x ( t ) be the complex representation of the transmitted chirp pulse [1]: where T is the pulse duration, B is the sweep bandwidth, and μ = B / T is the frequency modulation slope. The jammer estimates T and B , and then generates n sub‐waveforms, each one of them has a duration of T J = T / n , bandwidth of B , and frequency modulation slope of μ J = nμ .…”

“…Chirp waveform is one of the most commonly used waveforms in radar systems due to its high Doppler tolerance. But many types of deceptive jammers for example frequency shifting jammer, interrupted sampling repeater jammer, and active echo cancelation jammer can attack chirp radars and generate multiple false targets or suppress the true target echo [1,2]. Despite the fact that countering these jammers is not easy, several anti-jamming techniques are proposed to counter deceptive jamming effectively [3][4][5][6].…”

Countering self-protection interrupted sampling repeater jammer against chirp radar

“…This makes it attractive to be used in radar systems. But different types of deceptive jammers for example interrupted sampling repeater jammer (ISRJ), digital radio frequency memory (DRFM), frequency shifting jammer, and active echo cancelation (AEC) jammer can jam chirp radars and generate false targets or suppress the true target echo [1, 2]. DRFM is commonly used in electronic countermeasure because it can intercept, store, and retransmit jamming signal that are coherent with the radar signal.…”