Transmission device of a radiographic navigation system

Details Transmission device of a radiographic navigation system Transmission device of a radiographic navigation system

1975-05-02

1976-09-07

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 144

Patent

active

039797511

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.

REFERENCES:
patent: 3328798 (1967-06-01), Warfield
patent: 3534366 (1970-10-01), Guldenpfennig

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