Signal dynamic range compression apparatus and method including

Details Signal dynamic range compression apparatus and method including Signal dynamic range compression apparatus and method including

1990-12-21

1992-03-31

Barron, Jr., Gilberto

Communications: directive radio wave systems and devices (e.g.,

Clutter elimination

342 91, 342203, G01S 734

Patent

active

051012103

ABSTRACT:
The maximum amplitude of an input signal (IN) is compressed or reduced to a smaller value suitable for operation on the compressed signal (OUT) by a downstream signal processing stage (16) having insufficient dynamic range, ratio of maximum amplitude to root-mean-square (RMS) noise, to accommodate the original input signal (IN). The input signal (IN) is digitally sampled with coarse resolution to generate a correction signal (44) having a waveform which approximates only the large signal components (24) of the input signal (IN). Where the input signal (IN) consists of recurring received radar pulses, the large signals (24) represent clutter. The amplitude of the correction signal (44) is lower than and increases as a predetermined function of the amplitude of the input signal (IN), and is subtracted from the input signal (IN) so that the large signal components (24) are reduced whereas the small signal components (26), which represent desired target information, retain their original amplitude. Time and/or space estimates of the large signals may be stored and updated, and combined with the sampled input to generate the correction signal (44). A threshold is provided such that only input signals have a predetermined maximum amplitude are compressed.

REFERENCES:
patent: 3130400 (1964-04-01), Washburn
patent: 3187323 (1965-06-01), Flood et al.
patent: 3509558 (1970-04-01), Cancro
patent: 4003052 (1977-01-01), Adelman et al.
patent: 4381508 (1983-04-01), Durboraw, III
M. Skolnik, Radar Handbook, McGraw-Hill, 1970, section 5.6 (Gain Controlled Amplifiers), pp. 5-19 to 5-23.
Hiner, F. P., "The L2000, A Remote Radar Signal in Data Processor," Conf: Radar 1977, London, England, Oct. 77, pp. 168-172.

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