Abstract
In this paper, a novel difference-time difference of arrival (D-TDOA) time measurement method based on round-trip transmission (RTT) is proposed. The accuracy of time measurement is critical for high accuracy positioning, yet the traditional time difference of arrival (TDOA) time measurement method cannot deal well with the problem of time synchronization error, such as the initial time offset and transmission cumulate time error caused by clock frequency offset and drift. We formulate a D-TDOA time measurement mechanism to overcome the shortcoming of the traditional TDOA method in eliminating the influence of clock error. It is proved that the D-TDOA method can effectively eliminate the influence of initial time offset by analyzing the simulation data, which can also reduce the cumulate time error remarkably. The simulation results demonstrate that the D-TDOA method can significantly enhance the accuracy of time measurement in the circumstance that the AP clock synchronization is not required seriously.
Highlights
In recent years, with the rapid development of communication and navigation technology, location services as a new strategic industry has become an indispensable part
The simulation A compared the influence of initial time offset to the time measurement accuracy on traditional Time Difference of Arrival (TDOA) method and the Difference-Time Difference of Arrival (D-TDOA) method
Simulation B illustrates the influence of cumulate time error to the time measurement accuracy on traditional TDOA method and the D-TDOA method
Summary
With the rapid development of communication and navigation technology, location services as a new strategic industry has become an indispensable part. Authors in[2] achieved the high accuracy positioning method whose accuracy is 1m by using timing resolution of 1μs. Their final measurement result is the average of 500 times repeated measurements. The traditional TDOA [4-5] positioning method cannot deal well with the initial time offset and the cumulate time error caused by clock oscillator frequency drift, so it’ unable to meet the demand of indoor high accuracy positioning. In order to overcome the time measurement error,Difference-Time Difference of Arrival (D-TDOA) time measuring method is proposed in this paper.
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