Title: Radio theodolite angle measuring apparatus

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.

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Inventors: Ewen, Harold I. (Weston, MA, US)
Haroules, George G. (Lexington, MA, US)

Application Number: 549081
Filing Date: 1975-02-11
Publication_date: 1976-08-17
Assignee: The United States of America as represented by the Secretary of the (Washington, DC)
Primary Class(es): 342/424
Other Classes:
US Patent Ref:

3080559	Mar, 1963	Thor et al.	343/113.
3213453	Oct, 1965	Morriso, Jr. et al.	343/100.
3346860	Oct, 1967	Earp	343/105.
3729679	Apr, 1973	Da, Jr.	325/329.
3766556	Oct, 1973	Amoros, Jr.	343/113.
3900879	Aug, 1975	Lewinter	343/113.
3928852	Dec, 1975	Barker	343/105.

Other Refs:
Primary Examiner: Wilbur, Maynard R.
Assistant Examiner: Blum, T. M.
Attorney: Farmer; Herbert E., Deeley, Jr.; Harold P.