Low sidelobe linear FM chirp system

Details Low sidelobe linear FM chirp system Low sidelobe linear FM chirp system

1980-08-25

1983-09-13

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 1328

Patent

active

044045620

ABSTRACT:
An improved FM pulse compression system which has low range-time sidelobes nd is doppler tolerant. This system is implemented by using an analog-type linear FM modulated transmission pulse and processing the echo from this pulse by means of baseband sampling at the Nyquist sampling rate and then compressing this sampled signal by means of a discrete phase compression circuit. In brief, the present invention comprises a receiver for receiving the FM echo pulse, a sampling and holding circuit for sampling the echo at baseband at the Nyquist sampling rate and then converting to IF, and a discrete phase compression circuit for compressing the appropriate number of sampled outputs from the sampling and holding circuit. If an echo is properly indexed in the phase compression circuit, then a short pulse with a relatively high amplitude is generated.

REFERENCES:
patent: 3176296 (1965-03-01), Adams
patent: 3987285 (1976-10-01), Perry
patent: 4003054 (1977-01-01), Goldstone
patent: 4005423 (1977-01-01), Webb
patent: 4156876 (1979-05-01), Debuisser
patent: 4237461 (1980-12-01), Cantrell et al.
patent: 4359735 (1982-11-01), Lewis et al.
patent: 4359736 (1982-11-01), Lewis
patent: 4373190 (1983-02-01), Lewis et al.

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