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Title: Transmission device of a radiographic navigation system

Abstract: A transmission device of a radiographic navigation system for azimuth determination, in which an electronic rotating directional beam pattern and a static omnidirectional phase reference beam pattern are generated. For obtaining exact phase relationships between the signals required for generating the said beam patterns, phase control loops are included in the signal paths; in these loops the carrier wave frequencies are transposed to a lower frequency and the modulations are removed before phase comparison measurements are performed.


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Inventors: van den Berg, Frederik Louis (Hilversum, NL)

Application Number: 574103
Filing Date: 1975-05-02
Publication_date: 1976-09-07
Assignee: U.S. Philips Corporation (New York, NY)
Primary Class(es): 342/404
Other Classes:
US Patent Ref:
3328798Jun, 1967Warfield343/106.
3534366Oct, 1970Guldenpfennig343/106.

Other Refs:
Primary Examiner: Wilbur, Maynard R.
Assistant Examiner: Blum, T. M.
Attorney: Trifari; Frank R., Berka; George B.