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Nonrecurrent waveform to mitigate long-range spread Doppler clutter application to over-the-horizon radar

This paper describes the application of a nonrecurrent waveform (NRWF) to a relocatable over the horizon radar (ROTHR) located in southern Virginia. The waveform is designed to improve the detection of aircraft targets through the mitigation of long range spread doppler clutter, often encountered during nighttime operations. A discussion of the NRWF and its principle of operation are included, along with a brief description of ROTHR modifications. The focus of the paper is the presentation of test results from both engineering, clutter mitigation and target detection test conducted during January through April of 1997.