Server-assisted position determination in a radio network
First Claim
1. A server-assisted position detection system, comprising:
- a client global positioning system (GPS) receiver circuit, for receiving a first set of satellite positioning signal data from GPS satellites, the first set of data being insufficient to independently establish the location of the client GPS receiver;
a client transmitter to transmit the first set of data;
a client carrier detection module to detect radio traffic on a radio frequency (RF) channel;
a client transmit-enable module to enable the client transmitter when no radio traffic is detected on the RF channel;
a server receiver to receive the first set of data from the client transmitter; and
a server coupled to the server receiver and configured to analyze the satellite data received by the server receiver, the server using the first set of data and additional satellite positioning signal data to generate location information regarding the location of the client GPS receiver.
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Accused Products
Abstract
According to the principles of the invention, a client unit (102) comprises a client GPS receiver (104) is integrated with a two-way-radio transceiver (108) and a manager (116) for the purpose of performing server-assisted global position fixes, especially in cases where the location or situation makes unassisted fixes impossible or impractical. A server unit (120) is also provided, associated with a second two-way-radio transceiver (126) and a server manager (130). The first and second managers (116 and 130) function as communication managers, each comprising modules for detecting RF channel traffic, enabling transmitter portions of the transceivers (108 and 126). The system may also provide identification codes that accompany data sent from the client unit to the base station to identify the client unit.
32 Citations
21 Claims
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1. A server-assisted position detection system, comprising:
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a client global positioning system (GPS) receiver circuit, for receiving a first set of satellite positioning signal data from GPS satellites, the first set of data being insufficient to independently establish the location of the client GPS receiver;
a client transmitter to transmit the first set of data;
a client carrier detection module to detect radio traffic on a radio frequency (RF) channel;
a client transmit-enable module to enable the client transmitter when no radio traffic is detected on the RF channel;
a server receiver to receive the first set of data from the client transmitter; and
a server coupled to the server receiver and configured to analyze the satellite data received by the server receiver, the server using the first set of data and additional satellite positioning signal data to generate location information regarding the location of the client GPS receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12)
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11. A method of server-assisted location detection, comprising:
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requesting a location of a client unit;
detecting a plurality of satellite global position signals at the client unit in response to the location request;
capturing segments of the plurality of satellite signals;
transmitting data packets indicative of the captured satellite signals to a server unit via two way radio;
determining the location of the client unit by analysis of the satellite signal segments;
presenting the location of the client unit at a user interface. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification