Analog clutter cancellation algorithms for dynamic range reduction

Lee R. Moyer; Linda J. Hawkins; Russell D. Brown; Michael O. Little; Michael C. Wicks; Donald D. Weiner

doi:10.1117/12.157787

22 October 1993 Analog clutter cancellation algorithms for dynamic range reduction

Lee R. Moyer, Linda J. Hawkins, Russell D. Brown, Michael O. Little, Michael C. Wicks, Donald D. Weiner

Proceedings Volume 1954, Signal and Data Processing of Small Targets 1993; (1993) https://doi.org/10.1117/12.157787
Event: Optical Engineering and Photonics in Aerospace Sensing, 1993, Orlando, FL, United States

Abstract

Advanced radar receivers having an instantaneous dynamic range exceeding 90 dB are currently under development. These receivers must operate linearly to achieve satisfactory performance in a severe clutter environment. Presently available, state-of-the-art analog-to- digital converters (ADCs) having sufficiently high sampling rates do not have adequate dynamic ranges to digitize the outputs of these receivers. A technique has been developed that effectively reduces the dynamic range of the input signal prior to digitization. The dynamic range reduction is accomplished through a process that predicts the next radar return signal from the previous return signals, generates a replica waveform, and subtracts this replica waveform from the radar return signal prior to digitization. This process allows the radar return signal to be digitized without distortion by an ADC having a limited dynamic range. The full dynamic range of the radar return signal is then restored by adding the replica waveform to the ADC output. Tests and evaluations using both synthetic and recorded radar data have demonstrated in excess of a 30 dB reduction in the dynamic range of the signal at the ADC input when strong clutter is present.

Citation Download Citation

Lee R. Moyer, Linda J. Hawkins, Russell D. Brown, Michael O. Little, Michael C. Wicks, and Donald D. Weiner "Analog clutter cancellation algorithms for dynamic range reduction", Proc. SPIE 1954, Signal and Data Processing of Small Targets 1993, (22 October 1993); https://doi.org/10.1117/12.157787

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KEYWORDS

Radar

Radar signal processing

Receivers

Signal processing

Analog electronics

L band

Digital signal processing

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