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Class Information
Number: 342/389
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-chronic type > Loran > Loran-c
Description: Subject matter wherein the loran system provides a coarse measurement of time-difference through the matching of pulse envelopes, and a fine measurement by the comparing of phase between the carrier wave.

Sub-classes under this class:

Class Number Class Name Patents
342/390 With cycle selection 14

Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
7391369 Method of and apparatus for eliminating quadrature-generated signals in magnetic cross-loop antennas Jun. 24, 2008
5796366 Method of and apparatus for position location and tracking of a vehicle or the like by the reception at the vehicle of pulsed radio navigation signals as of the Loran-OC type and the like, wit Aug. 18, 1998
5635940 Communication configurator and method for implementing same Jun. 3, 1997
5563611 Method of and apparatus for integration of Loran-C and satellite navigation system (SNS) technologies for improved system accuracy, availability and integrity Oct. 8, 1996
5510800 Time-of-flight radio location system Apr. 23, 1996
5363112 Noise suppression processor for a carrier tracking loop Nov. 8, 1994
5311195 Combined relative and absolute positioning method and apparatus May. 10, 1994
5278568 Method of and apparatus for two-way radio communication amongst fixed base and mobile terminal users employing meteor scatter signals for communications inbound from the mobile terminals and o Jan. 11, 1994
5220333 Method and apparatus for determining universal coordinated time from Loran-C transmissions Jun. 15, 1993
5193215 Location signalling device for automatically placing a radio distress call Mar. 9, 1993
5181041 Accurate location system using transponded and correlated LORAN signals Jan. 19, 1993
5173690 Passive ranging system utilizing range tone signals Dec. 22, 1992
5105196 Loran-C alignment method Apr. 14, 1992
5032845 Vehicle locating system with Loran-C Jul. 16, 1991
4999638 Apparatus and method for synchronizing the signal averaging clock of a Loran C. receiver to the clock of a Loran C. transmitter Mar. 12, 1991
4959655 Method for the radiolocation of a vehicle carrying a receiving device, by measuring the differences between the times for receiving radio-frequency signals, and receiving device for carrying o Sep. 25, 1990
4914436 Ground proximity approach warning system without landing flap input Apr. 3, 1990
4888594 Loran-C receiver module Dec. 19, 1989
4833477 Emergency vessel location system May. 23, 1989
4821038 Method of and apparatus for Loran-C message communication with reduced skywave navigation location errors and the like Apr. 11, 1989
4814771 Apparatus and method for receiving and proessing Loran signals Mar. 21, 1989
4812851 Radio receiver with automatic interference cancellation Mar. 14, 1989
4804964 Loran-C signal receiving apparatus Feb. 14, 1989
4800391 Method of and apparatus for message communication on Loran-C navigational signal broadcasts and the like with reduced navigation errors Jan. 24, 1989
4791422 Methods of and apparatus for measuring time of arrival of remote Loran-C and related signals and effective time of transmission of local signals at transmitter sites Dec. 13, 1988
4774518 Loran-C signal phase tracking apparatus Sep. 27, 1988
4743912 Method of and apparatus for reducing cycle slippage errors in Loran-C and similar radio-frequency signal reception, particularly in vehicles undergoing acceleration May. 10, 1988
4670759 Automatic Loran-C signal detecting apparatus Jun. 2, 1987
4651157 Security monitoring and tracking system Mar. 17, 1987
4633260 Loran-C signal receiving apparatus Dec. 30, 1986
4631543 Method and apparatus for reducing the effects of impulse noise in Loran-C receivers Dec. 23, 1986
4595927 Loran C cycle slip reduction technique Jun. 17, 1986
4594594 Loran signal receiver Jun. 10, 1986
4584580 Apparatus for rejecting jamming waves Apr. 22, 1986
4539566 Automatic interference canceling apparatus Sep. 3, 1985
RE31962 LORAN-C navigation apparatus Jul. 30, 1985
4513378 High-accuracy navigating apparatus with step-driven projected chart Apr. 23, 1985
4468668 Method for processing signals in a navigation receiver Aug. 28, 1984
4459667 Guidance method and system for an automotive vehicle Jul. 10, 1984
4445223 Apparatus and method for determining the presence and frequency of a periodic signal Apr. 24, 1984
4435711 Radio telephone with position transmission capability Mar. 6, 1984
4416017 Apparatus and method for attenuating interfering signals Nov. 15, 1983
4392138 Apparatus and method for detecting and inhibiting signals interfering with a Loran C signal Jul. 5, 1983
RE31254 Self calibration of a LORAN-C navigation receiver May. 24, 1983
4383259 Marine navigational aid May. 10, 1983
4377866 Time multiplexed Loran signal processing apparatus Mar. 22, 1983
4325067 Method and apparatus for removing noise in a LORAN-C navigation receiver Apr. 13, 1982
4325068 Loran-C signal processor Apr. 13, 1982
4318105 Loran-C navigation apparatus Mar. 2, 1982

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