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Class Information
Number: 342/458
Name: Communications: directive radio wave systems and devices (e.g., radar, radio navigation) > Directive > Position indicating (e.g., triangulation) > Distance
Description: Subject matter including means to determine the extent of a space between two points.










Patents under this class:
1 2 3 4 5 6

Patent Number Title Of Patent Date Issued
4422076 Passive synthetic aperture system for locating a source of electromagnetic radiation Dec. 20, 1983
4405926 Methods and apparatus for warning aircraft of the presence and direction of electrical transmission lines Sep. 20, 1983
4393382 Direction finding and ranging system for locating scanning emitters Jul. 12, 1983
4370656 Use of bistatic radar system for determining distance between airborne aircraft Jan. 25, 1983
4359739 Method and apparatus for navigation through predetermined loitering paths Nov. 16, 1982
4339755 Passive-type range determining system using scanning receiving devices Jul. 13, 1982
4316193 Servo loop processor Feb. 16, 1982
4313183 Acoustic distance measuring method and apparatus Jan. 26, 1982
4301455 Groundspeed measurement system Nov. 17, 1981
4298874 Method and apparatus for tracking objects Nov. 3, 1981
4283726 Dual frequency distance measuring system Aug. 11, 1981
4281327 Range corrector circuit for a bistatic passive radar display Jul. 28, 1981
4268167 Distance measuring system May. 19, 1981
4238785 Zero-doppler shift positioning technique Dec. 9, 1980
4234942 Apparatus for measuring the length of pipe and other hollow members Nov. 18, 1980
4233588 Elevator position detector Nov. 11, 1980
4229620 Mobile radiotelephone station two-way ranging system Oct. 21, 1980
4229737 Ranging system and method for determining the range of a vehicle from a plurality of reference points Oct. 21, 1980
4223311 Long range listening system Sep. 16, 1980
4217588 Object monitoring method and apparatus Aug. 12, 1980
4199760 Method for measuring range to a rocket in flight employing a passive ground tracker station Apr. 22, 1980
4187491 Doppler compensated PSK signal processor Feb. 5, 1980
4182990 Radar receiver and method of indicating range to a radar source Jan. 8, 1980
4179697 Passive ranging method Dec. 18, 1979
4177465 Near-range personnel beacon locator apparatus Dec. 4, 1979
4176357 Passive method and apparatus for radar locating and parasitic surveilance Nov. 27, 1979
4173008 Method and apparatus for passive detection of marine objects Oct. 30, 1979
4170776 System for near real-time crustal deformation monitoring Oct. 9, 1979
4149168 Sequentially balanced modulation tone ranging system and method Apr. 10, 1979
4055830 Sonic measuring system Oct. 25, 1977
4041494 Distance measuring method and apparatus Aug. 9, 1977
4023176 Beacon tracking display system May. 10, 1977
4021807 Beacon tracking system May. 3, 1977
4008470 Passive ranging system Feb. 15, 1977
4001828 Beacon tracking receiver Jan. 4, 1977
3998410 Apparatus and method for detecting a digital change in data Dec. 21, 1976
3953856 Method and apparatus for mapping and similar applications Apr. 27, 1976
3939475 Method of measuring range with large bistatic angle radar Feb. 17, 1976

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