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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
|
| 출원번호 | US-0697754 (1991-05-09) |
| 발명자 / 주소 |
|
| 출원인 / 주소 |
|
| 인용정보 | 피인용 횟수 : 464 인용 특허 : 0 |
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
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 urban areas. The tracking system includes a sensor mounted on each object, a communication link, a workstation, and a GPS reference receiver. The sensor operates autonomously following initialization by an external network management facility to sequence through the visible GPS satellites, making pseudo range and delta range or time difference and frequency difference measurements. No navigation functions are performed by the sensor, thereby permitting significant reductions in the cost thereof. The raw satellite measurements, with relevant timing and status information, are provided to the communication link to be relayed periodically back to the workstation. Differential corrections may also be provided at the workstation to increase the accuracy of the object location determination. In normal operation, three satellite measurements are required to compute the location of the object, but for a short time period a minimum of two satellite measurements are acceptable with time, altitude, and map aiding information being provided by the workstation.
A tracking system employing global positioning system (GPS) satellites for determining the position of one or more objects to be tracked, the tracking system comprising: sensor means, mounted on each object, the sensor means being operative for receiving signals provided by a plurality of visible GP
A tracking system employing global positioning system (GPS) satellites for determining the position of one or more objects to be tracked, the tracking system comprising: sensor means, mounted on each object, the sensor means being operative for receiving signals provided by a plurality of visible GPS satellites and for computing sensor data comprising selected raw satellites measurements; workstation means, positioned at a central location that is remotely located with respect to said one or more objects, for periodically receiving and storing the raw satellite measurements computed by said sensor means, for computing therefrom position information relative to the one or more objects, and for displaying the computed position information to an operator at said central location, said workstation means being further operative for periodically providing initialization data in the form of sensor commands to said sensor means to enable said sensor means to acquire and track the plurality of visible GPS satellites, said workstation means being operative for storing a digital map containing route and altitude aiding information regarding each of the one or more objects, thereby facilitating computation of said position information using only high elevation satellites and when the one or more objects are operating in a high rise urban environment; and a communication link coupling said sensor means and said workstation means to facilitate the transfer of sensor data and sensor commands between said sensor means and said workstation means.
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