Abstract
Echo cancellation is used for eliminating echo signals by signal modulation in the frequency domain and time domain. However, it depends on the high accuracy of parameter estimation. In addition, it introduces an incompatible black mark in the synthetic aperture radar (SAR) image, which will be easily detected and inevitably degrades the deception performance. To address this problem, this article proposed a compound interference method that combines echo cancellation and deception jamming. In order to fuse the deception scene with the surrounding scene, the optimal deception template is generated by using the scene around the target of interest (TOI), and the deception template is used to modulate the coefficient of the original signal to generate the deception signal. Then, the deception signal is sent to the SAR platform together with the cancellation signal, which is generated by an active source. After the SAR process, the incompatible black mark in the image is replaced by a template with high similarity of surrounding scene, which effectively improves the deception performance. The proposed method can be used to cover the higher scattering characteristic of the TOI with the lower scattering characteristic of the deception template. Simulation results are provided and analyzed to validate the universality and the performance superiority of the proposed method.
Highlights
S YNTHETIC aperture radar (SAR) is widely used in military and civil fields because of its high-resolution imaging capability in all day-and-night and all weather [1]–[6]
With the development of SAR technology, new requirements and challenges have been put forward to SAR jamming deception to protect the target of interest (TOI) [7] being detected by SAR platform
This indicates that the interference performance is insensitive to the jammer error when the scattering characteristic of the target is significantly higher than the deception scene
Summary
S YNTHETIC aperture radar (SAR) is widely used in military and civil fields because of its high-resolution imaging capability in all day-and-night and all weather [1]–[6]. Which is highly similar to TOI echo signal [12] These jamming methods can protect TOI from being recognized by SAR. In the jamming process, we sample the scattering coefficient of the scene around TOI and generate the deception template to cover the cancellation region. RX receives the echo signal, and the cancellation signal is generated by the canceller, which is transmitted back to SAR sensor together with the jamming signal. A cancellation signal is obtained with equal in amplitude and opposite in phase to the target echo, so that the sum of Ii(tr, tm) and Ic(tr, tm) becomes zero and TOI will disappear from the SAR image. We will discuss how to generate jamming signal
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