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Class Information
Number: 342/393
Name: Communications: directive radio wave systems and devices (e.g., radar, radio navigation) > Directive > Beacon or receiver > With transmisson of bearing or position determinative signals > Iso-frequency type
Description: Subject matter in which similar frequency modulated signals or pulses, simultaneously emitted by two or more remote radiating stations, are received and compared as to their instantaneous frequencies.

Patents under this class:

Patent Number Title Of Patent Date Issued
8249618 System and method for enabling determination of position of a receiver Aug. 21, 2012
8179317 Method and apparatus for passive geolocation using synthetic-aperture processing May. 15, 2012
8004459 Determining a geolocation solution of an emitter on earth using satellite signals Aug. 23, 2011
5008679 Method and system for locating an unknown transmitter Apr. 16, 1991
4810947 Digital error detector for IFM receiver Mar. 7, 1989
4095226 System for communication Jun. 13, 1978
4087816 VLF radio position location system May. 2, 1978
4072950 LF/MF navigation system Feb. 7, 1978
4035802 Method and apparatus for wind measurement Jul. 12, 1977
4028703 Apparatus for radio position-fixing of the hyperbolic phase-measurement type Jun. 7, 1977

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