Class 342/395 - With hetrodyne synchronization

Subclass of Class 342 - Communications: directive radio wave systems and devices (e.g., radar, radio navigation)
Definition: Subject matter including spaced transmitting stations which
No. of patents: 3
Last issue date: 10/15/1985

Number	Title	Issue Date
4547777	Method of radio-position-finding through determination of phases of electromagnetic waves and receiving device for practicing the method A method of radio-position-finding by means of mapped contour lines of iso-phase shift between two radio-frequency waves separated by a low frequency and transmitted by a group of foci stations also emitting a reference wave associated with said two radio...	10/15/1985
4442432	Electronic navigation method and system A method and system for navigation is disclosed comprising a plurality of transmitters, pairs of which are excited from a common frequency source, and a receiver responsive to and deployed within the wave fields created by the transmitters. The receiver i...	04/10/1984
4229737	Ranging system and method for determining the range of a vehicle from a plurality of reference points Systems and methods for determining the range from a vehicle to a plurality of reference points. In one system a mobile transceiver is located on the vehicle for transmitting a ranging interrogation signal pulse modulated on an RF carrier having a given f...	10/21/1980

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