Digital center line filter

Details Digital center line filter Digital center line filter

1995-12-26

1997-08-26

Lobo, Ian J.

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

Return signal controls radar system

Receiver

342159, 342195, G01V 1300

Patent

active

056614870

ABSTRACT:
A center-line filter for a radar receiver is a cascade of an analog filter and a digital filter. The purpose of the filter cascade is to filter out all but a single line of a pulsed spectrum. The signal is passed through the analog filter, and then over-sampled. A sharp cutoff FIR filter is used to eliminate the remaining undesired lines. Since the analog filter already has the correct matched filter characteristic in the passband, the digital filter passband is deliberately wider and unsymmetrical. After digital filtering, the filter output is decimated to provide a desired output data rate.

REFERENCES:
patent: 3787851 (1974-01-01), Hughes
patent: 4809203 (1989-02-01), Wilson et al.
patent: 5168459 (1992-12-01), Hiller
patent: 5325318 (1994-06-01), Harris et al.
patent: 5390536 (1995-02-01), Zhang et al.
Tattersall et al., "Digital Bandlimiting Filters for PCM Transmission Systems", IEEE Trans. on Comm., vol. COM-27, No. 1, pp. 240-246 Jan. 1979.

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