Abstract
In recent years, the research of multistatic synthetic aperture radar (SAR) has become a hot spot because of its great potentials in military and civil applications. However, it is inevitably disturbed by electronic countermeasures. In the multistatic SAR image, the false target caused by transmitting deceptive jamming leads to misjudgment of the image information. In this article, a new antideceptive jamming method for multistatic SAR is proposed. This method can locate the deceptive jammer and effectively suppress it. First of all, the echo model of multistatic SAR in the jamming environment is set up. Based on this model, the relationship expression for the location of jammer is derived. Then, we use the maximally stable extremal region method and the Euclidean-distance-based method to detect and identify false target in the multistatic SAR image. By using the location information of false target, receivers, and transmitters, the expression of the jammer localization is solved to locate the jammer. Finally, the minimum variance distortionless response beamforming method and image mosaic method are used to effectively suppress the jamming. The simulation results show that the method is effective.
Highlights
S YNTHETIC aperture radar (SAR), due to its all-day and all-weather highresolution imaging, has attracted considerable attentions [1]
The deceptive jamming of synthetic aperture radar (SAR) is realized through obtaining the transmitting signal of the transmitter, analyzing the relevant parameters of the transmitting signal, and through parameter modulation, retransmitting the jamming signal to get false target appear in the SAR image, which is difficult to be eliminated by existing antijamming methods
When the jammer is in the imaging area, if we directly use the minimum variance distortionless response (MVDR) algorithm to process the jamming signal, a blank area is appeared in each SAR image
Summary
S YNTHETIC aperture radar (SAR), due to its all-day and all-weather highresolution imaging, has attracted considerable attentions [1]. In [18], the author proposes a method of barrage noise jamming based on dual jammer, which, by changing the geometric model of jammer, can conduct jamming to moving target detection of three channel SAR This method will cause the whole SAR image to be covered by jamming signal, so it cannot use displaced phase center antenna to detect the moving target effectively. The deceptive jamming of SAR is realized through obtaining the transmitting signal of the transmitter, analyzing the relevant parameters of the transmitting signal, and through parameter modulation, retransmitting the jamming signal to get false target appear in the SAR image, which is difficult to be eliminated by existing antijamming methods.
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