Radar doppler frequency measuring apparatus

Details Radar doppler frequency measuring apparatus Radar doppler frequency measuring apparatus

1975-12-05

1977-08-30

Hunt, Brooks H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 7A, G01S 944

Patent

active

040457974

ABSTRACT:
A radar doppler frequency measuring system is described which times the duration between zero level cross-over of a selected number of doppler cycles. Errors due to spurious zero level cross-overs of the doppler signal due to noise is minimized by a circuit which imposes a time delay after the detection of a zero cross-over before the detection of the next zero cross-over. The time delay is made proportional to the period of the doppler signal to enable the system to operate over a wide doppler frequency bandwidth.

REFERENCES:
patent: 3233084 (1966-02-01), Kendall et al.
patent: 3478356 (1969-11-01), Divine
patent: 3706096 (1972-12-01), Hammack
patent: 3838424 (1974-09-01), Goldfischer
patent: 3860924 (1975-01-01), Evans
MacLeod, A portable High-Resolution Counter for Low Frequency Measurements, Hewlett Packard Journal, Nov. 1973, pp. 10-15.

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