Clutter Cancellation Limits of Adaptive Processing Applied to Coherent Multiple-Input Multiple-Output Ground Moving Target Indication
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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Coherent, multiple-input multiple-output MIMO extensions to radar systems offer a number of performance advantages over more conventional approaches. For ground moving target indication GMTI, the benefits can include lower minimum detectable velocity MDV and more accurate target direction estimation. In part, these benefits are afforded by the superior clutter cancellation offered by the long, filled virtual array that MIMO can yield, while using relatively few physical antenna elements. In addition, the use of uncorrelated waveforms for coherent MIMO GMTI diffuses the transmitted energy uniformly over a broad azimuthal coverage region, yielding a long effective coherent integration time. This enhances the above benefits and also provides finer Doppler resolution. For applications in which the geometry and MIMO radar system design result in ground clutter occupying a suitably limited extent of range and Doppler, waveform sets such as time-division multiple access TDMA or Doppler-division multiple access DDMA can be used to realize the above benefits. However, it has been noted that the clutter cancellation is less effective when the clutter has a greater range-Doppler extent. Various alternative low-correlation waveform sets have failed to mitigate this problem.
- Computer Programming and Software
- Target Direction, Range and Position Finding