Real Time Wideband Direction Finding

In this paper, the developed FFT based interferometric direction finding of wideband radar threats for electronic support (ES) and electronic intelligence (ELINT) is presented. Using this method, target radar signal is separated from other radar signals using FFT. Phases of extracted radar signals for two or more channels are calculated. Angle of arrival of extracted radar signal is estimated with the phase differences of each channel pair at selected radar frequency. This method is also applied to frequency agile radars and pulse compression waveform radars. This method is implemented on FPGA platform in real time. For different SNR values, FFT sizes, radar signal instantaneous bandwidths simulation results and real time implementations are presented.