1
John P Mansell, William M Riley: Vehicle tracking and security system. Auto Trac, Mason Fenwick & Lawrence, June 29, 1993: US05223844 (1240 worldwide citation)

The present invention provides a vehicle tracking and security system which allows immediate response in case of vehicle theft, an accident, vehicle breakdown, or other emergency. Guardian and tracking functions are provided through Mobile Units installed in hidden locations in vehicles to be monito ...


2
Rodric C Fan, Amin A Mufti: Method and structure for distribution of travel information using network. Vectorlink, Edward C Kwok, Skjerven Morrill MacPherson Franklin Friel, September 28, 1999: US05959577 (521 worldwide citation)

A method is provided for processing position and travel related information through a data processing station on a data network. In one embodiment, a GPS receiver is used to obtain a measured position fix of a mobile unit. The measured position fix is reported to the data processing station which as ...


3
Leonid Sheynblat: Satellite positioning system augmentation with wireless communication signals. SnapTrack, Blakely Sokoloff Taylor & Zafman, December 7, 1999: US05999124 (509 worldwide citation)

A method and apparatus for processing position information from satellite positioning system satellites and from cellular based communication signals. In one example of a method according to the invention, a SPS receiver receives SPS signals from at least one SPS satellite. This SPS receiver is coup ...


4
David Vaughn: Vehicle speed control based on GPS/MAP matching of posted speeds. Trimble Navigation, Boris G Tankhilevich, January 16, 1996: US05485161 (474 worldwide citation)

The GPS-map speed matching system for controlling the speed of the vehicle is described. The system includes a GPS navigation receiver, a database processing facility, a GPS computer, an engine computer, a video display, a speed sensor and a heading sensor. The database processing facility can be lo ...


5
Norman F Krasner: GPS receiver and method for processing GPS signals. Precision Tracking, Blakely Sokoloff Taylor & Zafman, September 2, 1997: US05663734 (465 worldwide citation)

A GPS receiver in one embodiment includes an antenna which receives GPS signals at an RF frequency from in view satellites; a downconverter coupled to the antenna for reducing the RF frequency of the received GPS signals to an intermediate frequency (IF); a digitizer coupled to the downconverter and ...


6
Joseph Hoshen: Locator device useful for house arrest and stalker detection. AT&T IPM, Michael B Johannesen, Mony R Ghose, October 24, 1995: US05461390 (465 worldwide citation)

A locator device for monitoring the location of subjects, usable in conjunction with a database system connected to a wireless network, wherein the database system causes a polling signal to be sent periodically to each of the subject's locator devices in the area. The locator device includes a wire ...


7
Norman F Krasner: GPS receiver utilizing a communication link. SnapTrack, Blakely Sokoloff Taylor & Zafman, November 24, 1998: US05841396 (447 worldwide citation)

A precision carrier frequency signal for calibrating a local oscillator of a GPS receiver which is used to acquire GPS signals. The precision carrier frequency signal is used to calibrate the local oscillator such that the output of the local oscillator, which is used to acquire GPS signals, is modi ...


8
Alison K Brown, Mark A Sturza: Vehicle tracking system employing global positioning system (GPS) satellites. NAVSYS Corporation, William E Hein, July 6, 1993: US05225842 (444 worldwide citation)

A tracking system employing global positioning system (GPS) satellites provides extremely accurate position, velocity, and time information for vehicles or any other animate or inanimate object within any mobile radio communication system or information system, including those operating in high rise ...


9
David G Bird: Location of missing vehicles. Trimble Navigation, John Schipper, May 23, 1995: US05418537 (404 worldwide citation)

Method and apparatus for determining the present location of a missing vehicle, such as an automobile or marine vessel, using a Global Positioning System that receives GPS signals from two or more GPS satellites. A GPS antenna, GPS signal receiver/processor, a paging responder, a cellular telephone ...


10
Norman F Krasner: GPS receiver utilizing a communication link. SnapTrack, Blakely Sokoloff Taylor & Zafman, February 23, 1999: US05874914 (401 worldwide citation)

A GPS receiver in one embodiment includes an antenna which receives GPS signals at an RF frequency from in view satellites; a downconverter coupled to the antenna for reducing the RF frequency of the received GPS signals to an intermediate frequency (IF); a digitizer coupled to the downconverter and ...