Research on SAR Anti-jamming Technique Based on Orthogonal LFM-PC Signals with Adaptive Initial Phase

Deceptive jamming has become an important research direction because it can produce false targets in the SAR image without high power. To suppress the deceptive jamming effectively, a novel anti-jamming method using orthogonal LFM-PC signals with adaptive initial phase is proposed. A set of orthogonal waveforms with adaptive initial phase are predesigned and transmitted during each pulse repetition interval (PRI). The orthogonal waveforms and the adaptive initial phase causes range and azimuth defocusing of the false target in the image. The adaptive initial phase, which is designed by minimizing the clutter amplitude in the target area, has better anti-jamming performance then the random initial phase. The orthogonal waveforms and the adaptive initial phase are designed by sequential quadratic programming. Finally, the performance of the anti-jamming method is validated by simulation.