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5105198 |
Method of determining a position using satellites
A method of determining the position of an observation point on the earth using M satellites on geosynchronous orbits having predetermined orbit inclination angle such that N (<M) satellites are...
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5093669 |
Vehicle navigation apparatus
A navigation apparatus arranged in such a manner that the background image and a marker image denoting the user's vehicle position are moved in the opposite directions to each other when the...
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5089826 |
Navigation system for movable body
A navigation system for a movable body wherein a map to be displayed on a screen can be selected freely in accordance with a request of an operator and, when an initial map displayed is restored,...
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5087919 |
On-board navigation apparatus
An on-board navigation apparatus having a GPS receiver detects a difference between the current and the previous values of the estimated current position in terms of the longitude and latitude...
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5075693 |
Primary land arctic navigation system
A land navigation system for use in a vehicle, comprises, in combination, a device providing a signal representative of the heading of the vehicle, a device providing a signal representative of the...
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5068656 |
System and method for monitoring and reporting out-of-route mileage for long haul trucks
A system and method for monitoring and reporting out-of-route mileage for long haul trucks which includes transmitting route data from a dispatcher to a distant truck where comparisons aboard the...
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5068654 |
Collision avoidance system
A collision avoidance system providing to each properly equipped vehicle an indication of the locational direction, heading, and relative velocity of other similarly equipped vehicles or stationary...
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5055851 |
Vehicle location system
A system for determining a location of a selected vehicle from which an alarm signal is generated which includes a fixed array of cellular sites each site having a wireless signal detecting and...
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5045861 |
Navigation and tracking system
The invention concerns a navigation and tracking system, for monitoring the movement of a roving object which carries one of a pair of receiving stations (D, E) the other receiving station being at...
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5041837 |
Directional antennas for a roadside beacon system
A roadside beacon system in which a plurality of roadside antennas transmit data to vehicles passing closely adjacent. The transmitting antennas are mounted high above the sides of the roads and...
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5032845 |
Vehicle locating system with Loran-C
The location of a vehicle having an assigned serial number is determined at a location remote from the vehicle with a system including a central master station and plural local networks, each...
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5021794 |
Personal emergency locator system
The radio transmitter in a miniaturized transceiver concealed on a person to be located, such as a lost child, is activated and transmits a coded UHF radio homing signal upon receipt of an...
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5019828 |
High resolution navigation and mapping system
A combined navigational and display system for a person including a helmet carrying apparatus for communication, storage and processing of information and for the visual display of information. The...
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5014206 |
Tracking system
A system used for determining and recording the location of a vehicle during the occurence of predetermined events. The vehicle is equipped with a sensor or sensors which respond to the occurrence...
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5003317 |
Stolen vehicle recovery system
A stolen vehicle recovery system (20) in which a vehicle transceiver (30) is disposed on each vehicle (28) for cyclically transmitting a pulsed signal which is modulated by a data stream comprising...
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4987420 |
Method of determining a position using satellites
A method of determining the position of an observation point on the earth using M satellites on a stationary orbit which has a predetermined orbit inclination angle such that N (<M) satelites...
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4983984 |
Roadside beacon system with polarized beams
In a roadside beacon system for transmitting to vehicles moving along roads, signals on position and direction, linearly polarizing antennas mounted to be stationarey either beside or above the...
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4983980 |
Satellite radio signal tracking method for GPS receivers
A vehicle-mounted GPS receiver for positioning and reckoning being capable of tracking satellite signals without serious interruption when passing through a dead zone such as a tunnel by quick...
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4954836 |
Follow-up system for moving bodies
A system follows up or traces a moving body accompanied by a radio signal transmitter which constantly generates a radio signal of a predetermined frequency or is adapted to generate such a radio...
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4949268 |
Land vehicle navigation system
A land vehicle navigation system is adapted to display the present position of a vehicle by receiving signals from a combination of satellites under the global positioning navigation system. The...
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4947151 |
Wheel mounted motion and tampering alarm
A tamper-proof motion and tampering alarm for a pneumatic tired vehicle consists of a motion detector, tampering detectors, radio transmitter, and power supply. All of these are mounted inside the...
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4939522 |
Method and system for monitoring vehicle location
Multiple vehicles located within a predefined search space are located and tracked using at least two spaced-apart transmitters. Each transmitter can broadcast an omnidirectional initialization...
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4916455 |
Locating system and method
The present invention includes both a system and a method for locating a source of a randomly modulated signals. In one form of the invention at least three receiving stations receive and process...
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4910493 |
Security systems
A vehicle security system can be fitted to a vehicle which has a radio transmitting device such as a cellular telephone, PMR or CB set. A control unit is arranged to periodically alert the driver...
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4908629 |
Apparatus for locating and/or tracking stolen or missing vehicles and the like
An improved vehicle or other object-tracking and location system, preferably, though not essentially, of national scope, wherein transponder or transceiver-equipped stolen or missing vehicles or...
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4897661 |
Method and apparatus for determining the position of a vehicle
There is provided a system in which a transponder is carried by each vehicle traveling on or above the earth's surface which transmits a signal which is responsive to an interrogation signal to a...
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4896161 |
Roadside beacon system
A navigator system for providing in a moving vehicle a display of the position of the vehicle on a map. This position is recalibrated by a roadside antenna that transmits a split beam so that the...
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4891650 |
Vehicle location system
A system for determining a location of a selected vehicle from which an alarm signal is generated which includes a fixed array of cellular sites each site having a wireless signal detecting and...
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4888595 |
Acquisition signal transmitter
An encoded information transmitter which transmits a radio frequency carrier that is amplitude modulated by a constant frequency waveform and thereafter amplitude modulated by a predetermined...
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4864313 |
Voting method of locating mobile objects
This invention relates to a system and method for locating mobile objects. The system includes many signposts positioned within a monitored area and many mobile objects. The monitored area is...
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4857840 |
Information and guiding system including a portable receiver device having an electromagnetic wave antenna and magnetic field sensor
A portable device for communication is useable during movement by a person. Individual portable receivers (2), the size of a credit card, display and/or broadcast to a user, automatically or by...
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4845504 |
Mobile radio network for nationwide communications
A mobil radio communication network utilizing meteor burst communication medium. A master station communicates with a plurality of mobile radio stations using digital messaging. Each of the master...
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4833481 |
Roadside beacon system
A roadside antenna system permitting the transmission of data to a vehicular navigation system and providing for the recalibration of positional data carried by the navigation system includes an...
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4823138 |
Roadside beacon system
A roadside beacon system having improved reliability in the face of multi-path fading and the presence of large vehicles or the like which shield or scatter the received signal. The roadside...
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4823137 |
Multiple-fixed-frequencies navigation system
A radio navigation system is disclosed which uses multiple fixed frequencies for calculating the bearing and distance of a local station from a central station. The central station has a receiver...
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4818998 |
Method of and system and apparatus for locating and/or tracking stolen or missing vehicles and the like
An improved vehicle or other object-tracking and location system, preferably, though not essentially, of national scope, wherein transponder or transceiver-equipped stolen or missing vehicles or...
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4812852 |
Locating system and method
The present invention includes both a system and a method for locating a source of a randomly modulated radio signal. In one form of the invention, at least three receiving stations at known...
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4799062 |
Radio position determination method and apparatus
A method and apparatus for radio position determination is provided including an unknown position transmitter for transmitting a radio wave having compensation for multipath, a plurality of base...
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4791572 |
Method for accurately displaying positional information on a map
A method for accurately displaying positional information of a map. A street or terrain map is produced and then digitized. The actual location of various antenna monuments is determined and a...
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4751512 |
Differential navigation system for remote mobile users
A differential navigation system applicable to mobile users and covering a wide range geographic area, including remote regions. A reference receiver of known location tracks a navigation...
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4743913 |
Hybrid navigation system for determining a relative position and direction of a vehicle and method therefor
A hybrid navigation system for determining a relative position and direction of a vehicle and method therefor. In the hybrid navigation system and method, a magnitization quantity on a vehicle body...
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4742357 |
Stolen object location system
A stolen object location system having a base station, a location network and an object unit which is associated with the object to be located. The location system is capable of operating in a...
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4740792 |
Vehicle location system
A vehicle locating system (VLS) comprises a large number, for example, several million, vehicle-mounted transmitters and several benchmark transmitters; first, second and third signal relay...
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4728959 |
Direction finding localization system
The present invention combines the relative insensitivity of the phase angle differences of a radio signal to the signal distortions inherent in an urban environment with digital signal processing...
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4701760 |
Method for positioning moving vehicles and exchanging communications between the vehicles and a central station
A method for monitoring vehicles from a central station, consisting of obtaining the approximate coordinates of each vehicle from signals transmitted by stations of the world omega network and...
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4680590 |
Position finding system
Three fixed reference stations having known positions comprise Omega receivers. Phase measurements made at all three stations are assembled at a master station, utilizing landlines or radio links...
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4667202 |
Mobile radio network
A mobile radio network comprises a plurality of base stations in a mutual three-dimensional arrangement in the manner of a cellular system. A respective, rigidly prescribed plurality of immediately...
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4651157 |
Security monitoring and tracking system
A method and apparatus for positively indicating the position of a land-based vehicle, a marine vessel or an aircraft, utilizing a security system provided in the secured mode of transportation...
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4651156 |
Integrated radio location and communication system
An integrated radio location and communication system comprising a plurality of radio locator-transmitter devices which may be fixed to vehicles and/or carried by persons and which are capable of...
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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...
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