Time-varying STAP for nonstationary hot clutter cancellation

Abstract

This paper addresses the problem of mitigating non-stationary diffusely scattered multipath interference or "hot clutter" by space-time adaptive processing (STAP) in radar systems that use a multi-channel receive antenna array. A computationally efficient time-varying (TV) fast-time STAP algorithm that can effectively cancel hot clutter during the coherent processing interval (CPI) while simultaneously preserving the Doppler spectrum characteristics of the ordinary backscattered "cold clutter" is proposed. The TV-STAP method is compared with several benchmark techniques in a numerical study simulating aircraft and ship detection in over-the-horizon (OTH) radar.

Advancements at the Lower End: Advances in HF, VHF, and UHF Systems and Technology

“…Television (TV) BC in the United States uses both the VHF and UHF bands (54)(55)(56)(57)(58)(59)(60)(61)(62)(63)(64)(65)(66)(67)(68)(69)(70)(71)(72)(76)(77)(78)(79)(80)(81)(82)(83)(84)(85)(86)(87)(88). With the advent of digital TV (DTV), U.S. station channels were mainly reassigned to the UHF band, with former VHF stations allowed to return to VHF when it was determined that coverage was reduced at the higher frequency.…”

“…The basic transmission system using chirped FM has not changed much since 2002, but there has been significant work in new areas of signal processing to improve OTH performance. Spacetime adaptive processing [56], [57] and cognitive radar [58]- [60] techniques, for example, are now being used to improve and reduce multipath interference. Since the standard OTH radar system contains multiple transmit and multiple receive antennas, multiple-input, multipleoutput techniques [61], [62] can be used in beamforming to mitigate signal clutter.…”