Method and system for measuring doppler frequency shift of an ec

Details Method and system for measuring doppler frequency shift of an ec Method and system for measuring doppler frequency shift of an ec

1974-12-31

1977-04-05

Hubler, Malcolm F.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 944

Patent

active

040165680

ABSTRACT:
A beam of diverging electromagnetic radiation of a predetermined frequency is transmitted to a target and the doppler shift of frequency of an echo due to relative movement of the target and a point of reception is detected conventionally by combining the frequency of the echo and the predetermined frequency. The number of cycles within the detected doppler shift frequency is counted to provide a delay to initiate measurement of doppler shift at a preselected angle of incidence of the echo. The effective area of measurement is thus restricted to a narrow region of the beam with the resultant high degree of precision.

REFERENCES:
patent: 2524610 (1950-10-01), Storm et al.
patent: 3034049 (1962-05-01), Downs
patent: 3056128 (1962-09-01), Ball et al.
patent: 3365716 (1968-01-01), Jorgensen
patent: 3373428 (1968-03-01), Atlas

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