Study of count-countermeasures performance of basing chaotic code orthogonal frequency division multiplexing SAR

Conventional linear frequency modulation (LFM) synthetic aperture radar (SAR) is incapable of countering repeat deception jamming. A new SAR signal based on chaotic code orthogonal frequency division (COFDM) was proposed. The fact that chaotic codes are sensitive to the initial values allows generating a large number of different chaotic sequences SAR waveforms where COFDM-SAR signal is orthogonal to each other, enabling COFDM-SAR countering not only active noise but also repeat deception jamming. The procedures for COFDM waveform generation and SAR jamming processing were discussed. Comparative studies of the counter-countermeasure performance between COFDM-SAR and LFM-SAR were made. Simulation results demonstrate the superior performance of COFDM-SAR to LFM-SAR in countering repeat deception as well as active noise jamming.