Performance of random OFDM radar signals in deception jamming scenarios

Abstract

The paper examines the performance of randomly generated OFDM waveforms in presence of deception jamming. The scenario of interest uses OFDM waveforms for synthetic aperture radar (SAR) imaging of a target area into which a digital radio frequency memory (DRFM) repeat jammer has been introduced. The jammer attempts to introduce false targets into the final image by replicating the radar transmitted waveform. SAR images are often constructed using a back projection algorithm requiring the presence of a false target to rely heavily on the matched filter (MF) output of the radar and jamming signals. Monte Carlo simulations are performed to determine probability density functions for maximum MF output for both cross-correlation and auto-correlation of the random OFDM waveforms containing WGN. A MF threshold is then chosen and probability of false alarm and probability of detection are simulated for varying SNRs.