Adaptive OFDM radar for detecting a moving target in urban scenarios

S. SEN; M. HURTADO; A. NEHORAI

Orlando, FL, USA

Congreso; International Waveform Diversity and Design Conference; 2009

We address the problem of detecting a moving targetin an urban canyon using an orthogonal frequency division multiplexing(OFDM) radar and exploiting the multipath reflections.The multipath propagation increases the spatial diversity of theradar system and provides different Doppler shifts over differentpath. In addition, the use of broadband OFDM signal providesfrequency diversity to the system. We develop a parametricmeasurement model that accounts for the multipath componentsat multiple frequencies as well as Doppler shifts. Then, wedevelop a statistical detection test and evaluate its performancecharacteristics. Based on this, we propose an algorithm tooptimally design the spectral weights for the next transmittingwaveform. We present a few numerical examples to illustrateour analytical results. We demonstrate the achieved performanceimprovement due to the exploitation of multipath propagation,OFDM signalling, and adaptive waveform design.