(under subclass 47) Subject matter including means operating at VHF and providing radial lines of positioning any direction as determined by bearing selection within the receiving equipment, or means operating at UHF using pulse techniques to provide a polar coordinate (rho-theta) system of navigation.
(1) Note. The VOR means emits a (variable) modulation whose phase relative to a reference modulation is different for each bearing of the receiving point from the interrogator station.
(2) Note. For TACAN the distance, (rho), function operates as DME and the bearing function is derived by rotating the ground transponder antenna so as to obtain a rotating multilobe pattern for coarse and fine information.
SEE OR SEARCH THIS CLASS, SUBCLASS:
399, for directive radio communication beacon systems including TACAN equipment and subclasses 401+ and 404+ for systems which include VOR equipment.
SEE OR SEARCH CLASS
701, Data Processing: Vehicles, Navigation, and Relative Location,
218, for computer navigation systems utilizing TACAN equipment.
