Directive > Beacon or receiver > With transmisson of bearing or position determinative signals > Iso-frequency type > Patents

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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
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