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| Number | Title | Issue Date |
| 4596988 | Remote controlled tracking transmitter and tracking support system A tracking system which when interrogated automatically reports data corresponding to the location of an unknown missing respondent, and thus permits one to find the location of an article stolen or high jacked such as an automobile, truck, van, boat, air... | 06/24/1986 |
| 4494119 | Distress radiolocation method and system A dedicated distress radiolocation system combines direction-finding techniques with calculations based on signal strength to precisely locate a distress transmission and effect rescue of the person or property in distress. The system is capable of locati... | 01/15/1985 |
| 4463297 | Controller for mechanically actuated device A controller is described for limiting the rate and acceleration of a device positioned by at least one actuator which responds to a sequence of position commands separated by time intervals incorporating a subtractor for taking the difference of two cons... | 07/31/1984 |
| 4459667 | Guidance method and system for an automotive vehicle A guidance method and system for an automotive vehicle which switches from an electronic navigational signal method to a dead reckoning method when any of the field strengths of three navigational electromagnetic wave signals drops below a predetermined l... | 07/10/1984 |
| 4422076 | Passive synthetic aperture system for locating a source of electromagnetic radiation A vehicle-mounted passive synthetic aperture system for locating a source of electromagnetic radiation having a given wavelength λ. The system includes first and second receiving antennas, a phase sensitive receiver and a signal processor. The first and ... | 12/20/1983 |
| 4229620 | Mobile radiotelephone station two-way ranging system Some cellular mobile radiotelephone systems use tones for certain call connection supervisory functions on radio links. The presence of the correct tone in a received radio channel call signal is determined by using the received signal for producing (32) ... | 10/21/1980 |
| 4209787 | Method for monitoring the location of monitored objects A method for monitoring the location of monitored objects within a monitored area wherein signpost units are positioned at the intersections of first and second coordinate grid lines and each signpost unit transmits a signpost code comprising a first port... | 06/24/1980 |
| 4112421 | Method and apparatus for automatically monitoring objects An improved method and apparatus for automatically monitoring objects, such as vehicles, for example, wherein signpost units are positioned at predetermined locations and each signpost unit transmits a binary signpost code for reception via units installe... | 09/05/1978 |
| 4084241 | System for processing movement information of vehicle A system for generating the data concerning the position of a moving vehicle comprising paired independently rotatable wheels provided at the opposite sides of the moving direction of the vehicle, the system comprising first and second pulse generators in... | 04/11/1978 |
| 4023176 | Beacon tracking display system A display system is disclosed for use in connection with a beacon tracking receiver. The display system provides both audible and visual displays for use in locating a source of radio transmission. The display includes an audible tone signal to indicate t... | 05/10/1977 |
| 4001828 | Beacon tracking receiver A radio frequency receiver is responsive to signals radiated by a remote transmitter. The receiver includes at least one pair of antennas separated by approximately one-half wavelength at the transmitter frequency. The phases of the signals detected by th... | 01/04/1977 |
| 3980948 | System and process for locating sources of radiation A vehicle location system is provided for determining the coordinate location of a vehicle through radio transmission radiation from the vehicle and the system includes a plurality of receiver sites at known coordinate locations each having antenna-couple... | 09/14/1976 |
