Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1975-07-11
1978-01-03
Caldwell, Sr., John W.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
325 66, 325118, 343112R, 362269, H04B 708
Patent
active
040670155
ABSTRACT:
A system for tracking moving signal sources is disclosed which is particularly adaptable for use in tracking stage performers, although a wide range of other uses is possible. A miniature transmitter is attached to the person or object to be tracked and emits a detectable signal of a predetermined frequency. A plurality of detectors positioned in a preset pattern sense the signal and supply output information to a phase detector which applies signals representing the angular orientation of the transmitter to a computer. The computer provides command signals to a servo network which drives a device such as a motor driven mirror reflecting the beam of a spotlight, to track the moving transmitter.
REFERENCES:
patent: 1219682 (1917-03-01), Vansize
patent: 3514608 (1970-05-01), Whetter
patent: 3646580 (1972-02-01), Fuller et al.
patent: 3685053 (1972-08-01), Kirkpatrick
patent: 3696248 (1972-10-01), Cunningham et al.
patent: 3783263 (1974-01-01), Cruse
patent: 3790948 (1974-02-01), Ratkovich
patent: 3886555 (1975-05-01), Royal
Albus James S.
Evans, Jr John M.
Johnson Edwin G.
Mogavero Louis N.
Caldwell Sr. John W.
Groody James J.
Lawrence Nina M.
Manning John R.
The United States of America as represented by the National Aero
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