Radio theodolite angle measuring apparatus

Details Radio theodolite angle measuring apparatus Radio theodolite angle measuring apparatus

1975-02-11

1976-08-17

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 502

Patent

active

039757366

ABSTRACT:
An intermediate frequency interferometric technique and apparatus for the measurement of angles, for example the measurement of the elevation and azimuth bearing angles between an aircraft installed transmitter and a ground based receiver, are disclosed. Carrier and sideband signals emitted by a mobile transmitter are received by at least a pair of fixed position antennas, spaced at a nominal distance equivalent to the wavelength of the frequency separation between the transmitted carrier and its associated sideband, and the angle related path length difference between the transmitter and the spaced receiving antennas is measured in wavelengths at the carrier modulation frequency.

REFERENCES:
patent: 3080559 (1963-03-01), Thor et al.
patent: 3213453 (1965-10-01), Morrison, Jr. et al.
patent: 3346860 (1967-10-01), Earp
patent: 3729679 (1973-04-01), Day, Jr.
patent: 3766556 (1973-10-01), Amoroso, Jr.
patent: 3900879 (1975-08-01), Lewinter
patent: 3928852 (1975-12-01), Barker

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