Communications device for conveying geographic location information over capacity constrained wireless systems
First Claim
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1. A mobile object having a communications unit operative to transmit geographic locations to a principal entity over a wireless communications system, the communications unit comprising:
- a GPS receiver configured to determine a first position of the mobile object and a second position of the mobile object;
a controller configured to determine whether the second position is within a geographic area that includes the first position;
a transceiver configured to send a full position transmission comprising absolute latitude and longitude coordinates of the first position of the mobile object to the principal entity, whereinthe transceiver, responsive to a determination that the second position is within the geographic area, is further configured to send a delta position transmission to the principal entity comprising a numeric value representing longitude and latitude coordinates of the second position relative to the previously transmitted absolute coordinates of the first position, andthe transceiver, responsive to a determination that the second position is outside the geographic area, is further configured to send a full position transmission comprising absolute latitude and longitude coordinates of the second position of the mobile object to the principal entity.
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Abstract
The present invention enables efficient communication of location identification of remote movable objects or vehicles over capacity-constrained wireless communications systems by transmitting only the truncated latitude and longitude coordinate data relative to a dynamically alterable and previously unknown coordinate reference anchor.
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Citations
19 Claims
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1. A mobile object having a communications unit operative to transmit geographic locations to a principal entity over a wireless communications system, the communications unit comprising:
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a GPS receiver configured to determine a first position of the mobile object and a second position of the mobile object; a controller configured to determine whether the second position is within a geographic area that includes the first position; a transceiver configured to send a full position transmission comprising absolute latitude and longitude coordinates of the first position of the mobile object to the principal entity, wherein the transceiver, responsive to a determination that the second position is within the geographic area, is further configured to send a delta position transmission to the principal entity comprising a numeric value representing longitude and latitude coordinates of the second position relative to the previously transmitted absolute coordinates of the first position, and the transceiver, responsive to a determination that the second position is outside the geographic area, is further configured to send a full position transmission comprising absolute latitude and longitude coordinates of the second position of the mobile object to the principal entity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A communications unit for efficient transmission of geographic locations of a mobile object to a principal entity over a wireless communications system, comprising:
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a GPS receiver for receiving absolute latitude and longitude coordinates of the mobile object at a first position; a controller configured to determine whether the absolute coordinates are the first coordinates received during a continuous period of sequential asyachronous location identification, wherein the controller establishes a geographic area centered at the absolute coordinates and having a predetermined size in the event that the absolute coordinates are the first coordinates and determines whether the absolute coordinates are within a previously established geographic area centered at previously transmitted absolute coordinates and having a predetermined size if the coordinates are not the first coordinates; and a transceiver, coupled to the controller, configured to send a full position transmission comprising the absolute coordinates to the principal entity if the coordinates are the first coordinates received during the period, the transceiver further configured to send a delta position transmission to the principal entity comprising a numeric value representing longitude and latitude coordinates of the first position relative to previously transmitted absolute coordinates if the coordinates are within the previously established geographic area, the transceiver further configured to send a full position transmission comprising the absolute coordinates to the principal entity and establishing a geographic area centered at the absolute coordinates and having a predetermined size if the coordinates are outside the previously established geographic area. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification