GLOBAL POSITIONING SYSTEM ERROR CORRECTION, VEHICLE TRACKING AND OBJECT LOCATION
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Accused Products
Abstract
A method and computer program for determining an error factor for a differential global positioning system is disclosed as well as a method of tracking a vehicle. In determining the error factor, estimated positional data is transmitted from a GPS via GPRS to a server. Since the GPS signals are being transmitted from a vehicle travelling along a known route, i.e. a road or rail track, the data can be matched to the route and a correction factor calculated. The error factor is then transmitted to differential GPS devices. For vehicle tracking a global positioning system sends, via GPRS, data a regular intervals relating only to its position.
20 Citations
57 Claims
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1-41. -41. (canceled)
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42. A method of determining an error factor for a differential global positioning system, comprising the steps of:
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receiving data transmitted from at least one device travelling along at least one of a plurality of known routes, the data relating to a plurality of assumed positions of the device on the basis of global positioning system signals received by global positioning system receiver in said device; comparing a plurality of said assumed positions of the device with said plurality of routes to determine the route that most closely corresponds with the plurality of assumed positions; and comparing a plurality of said assumed positions with the determined route to calculate an error factor. - View Dependent Claims (43, 44, 50, 54)
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45. A computer program for determining an error factor for a differential global positioning system, the program comprising:
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first computer code for receiving data transmitted from at least one device travelling along at least one of a plurality of known routes, the data relating to a plurality of assumed positions of the device on the basis of global positioning system signals received by global positioning system receiver in said device; second computer code for comparing a plurality of said assumed positions of the device with said plurality of routes to determine the route that most closely corresponds with the plurality of assumed positions; and third computer code for comparing a plurality of said assumed positions with the determined route to calculate an error factor. - View Dependent Claims (46, 47)
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48. A method of tracking a global positioning system receiving device, comprising the steps of:
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receiving a plurality of global positioning system signals relating to a position of said device; storing data relating to said position of said device at known intervals; and transmitting said data relating to said position of said device, said transmission including Cartesian coordinates indicating said position and excluding data relating to the speed and direction that the device is travelling or including vector coordinates indicating said position relative to a previous position and excluding Cartesian coordinates indicating said position. - View Dependent Claims (49, 53)
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51. A first device for indicating the direction to at least one second device, the first device comprising:
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a receiver for receiving information relating to the location of a second device; at least one location determining device for determining the location of said first device; at least one calculating device for calculating the direction from said first device to said second device; and at least one indication device for indicating said direction. - View Dependent Claims (52)
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55. A method of indicating the direction from a first device to at least one second device, the method comprising the steps of:
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a first device receiving information relating to the location of a second device; determining the location of said first device; calculating the direction from said first device to said second device; and indicating said direction. - View Dependent Claims (56, 57)
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Specification