Method and system for synchronization offset reduction in a TDOA location system
First Claim
1. A method for reducing synchronization offset errors in a Time Difference of Arrival (TDOA) location finding wireless system, comprising:
- receiving transmissions from at least one sync unit at multiple location transceivers, wherein the multiple location transceivers are synchronized from the sync unit;
determining actual times-of-arrival (TOA) of the received transmissions in response to receiving transmissions;
performing a wireless distance measurement between the transceivers and the at least one sync unit, the wireless distance measurement performed by the transceivers in response to the received transmissions from the at least one synchronization (sync) unit;
computing an actual propagation time between the sync unit to the transceivers;
computing differences between the actual propagation time and theoretical propagation time determined in conformity with the predetermined locations;
estimating synchronization offset error of the transceivers in conformity with the computed differences; and
correcting the synchronization offset error.
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Accused Products
Abstract
A method for reducing synchronization offset errors in a TDOA location finding wireless system, comprising: receiving transmissions from at least one sync unit at multiple location transceivers, wherein the multiple location transceivers are synchronized from the sync unit; determining actual times-of-arrival of the received transmissions in response to receiving transmissions; performing a wireless distance measurement between the transceivers and the at least one sync unit, the wireless distance measurement performed by the transceivers in response to the received transmissions from the at least one sync unit; computing an actual propagation time between the sync unit to the transceivers; computing differences between the actual propagation time and theoretical propagation time determined in conformity with the predetermined locations; estimating synchronization offset error of the transceivers in conformity with the computed differences; and correcting the synchronization offset error.
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Citations
26 Claims
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1. A method for reducing synchronization offset errors in a Time Difference of Arrival (TDOA) location finding wireless system, comprising:
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receiving transmissions from at least one sync unit at multiple location transceivers, wherein the multiple location transceivers are synchronized from the sync unit; determining actual times-of-arrival (TOA) of the received transmissions in response to receiving transmissions; performing a wireless distance measurement between the transceivers and the at least one sync unit, the wireless distance measurement performed by the transceivers in response to the received transmissions from the at least one synchronization (sync) unit; computing an actual propagation time between the sync unit to the transceivers; computing differences between the actual propagation time and theoretical propagation time determined in conformity with the predetermined locations; estimating synchronization offset error of the transceivers in conformity with the computed differences; and correcting the synchronization offset error. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A Time Difference of Arrival (TDOA) location finding wireless system, comprising:
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at least one sync unit for providing reference sync transmissions; a plurality of location transceivers, each location transceiver including a timebase for detecting actual times-of-arrival of periodic reference sync transmissions, each of the plurality of transceivers located at predetermined locations with respect to the at least one sync unit, the plurality of location transceivers are able to perform wireless distance measurement with the at least one synchronization (sync) unit; and a processor coupled to a memory, the memory containing program instructions for execution by the processor, wherein the program instructions comprise program instructions for; computing an actual propagation time between the sync unit to the plurality of transceivers; computing differences between the actual propagation time and theoretical propagation time determined in conformity with the predetermined locations; estimating synchronization offset error of the plurality of transceivers in conformity with the second computed differences; and correcting the synchronization offset error. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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Specification