Analysis of Characteristics and Suppression Methods for Self-Defense Smart Noise Jamming

Abstract

Self-defense smart noise jamming can automatically aim a signal frequency and obtain antenna gain and matching filtering processing gain, posing a huge threat to the normal performance of radar. In response to this situation, this article conducts an in-depth analysis of two typical smart noise jamming methods: noise convolution jamming methods and noise product jamming methods. The distribution characteristics of the two jamming methods in both time–frequency dimensions and their internal time–frequency relationships are analyzed. Based on this, a self-defense smart noise jamming suppression method based on pulse frequency stepping is proposed. This method obtains the true distance information of the target based on the phase difference caused by frequency stepping between adjacent pulses and uses this information to construct a filter to filter the radar echo, achieving jamming suppression. Simulation experiments have verified the effectiveness of this method.

Radar Signal Classification with Multi-Frequency Multi-Scale Deformable Convolutional Networks and Attention Mechanisms

“…This approach is designed to counteract the challenges associated with the suppression of SMSP interference without losing the energy of real targets, in turn achieving a 100% target detection probability under certain conditions. Zhu et al [47] explored self-defense intelligent noise jamming, examining two typical intelligent noise barrier methods and proposing a suppression technique based on pulse frequency stepping. This method effectively filters radar echoes by exploiting the phase shifts caused by frequency stepping, thereby mitigating the threat posed by intelligent noise jamming.…”

Echo Preprocessing-Based Smeared Spectrum Interference Suppression

“…Performing the fast Fourier transform (FFT) to (9) in the slow-time domain results in the coherent integration result of y r t, t m , i.e.,…”

“…Various kinds of interference pose a great threat to the survival of radar. Digital radio frequency memory (DRFM) [1][2][3] technology has been widely used in electronic countermeasures [4], which brings different interference [5][6][7][8] and stimulates the corresponding electronic counter-countermeasures [9][10][11][12]. At the present stage, the serious difficulty of radar anti-interference is concentrated in the main lobe, as the anti-interference in the sidelobe has been well restrained by sidelobe cancellers and blanking [13].…”