減輕TOA和AOA定位系統(tǒng)非視距影響的方法
A New Method for Mitigating the Effect of NLOS Propagation in the TOA and AOA Hybrid Location System
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摘要: 結合圓位置線誤差、直線位置線誤差與參數誤差的關系,該文提出了一種利用所有基站測量的波達時間與最近一個基站測量的所有多徑的到達角進行混合定位的方法.在該方法中,對波達時間用測量的波達時間總是大于等于視距傳播時間進行約束,對到達角用GBSBCM確定的最大角度擴展進行約束,以有效減小非視距傳播的影響,提高定位精度.仿真結果證明了該方法的有效性。Abstract: Based on the relationship between the errors of the Circular Lines of Position (LOPs) and the straight LOPs and that of the measured parameters, a hybrid locating system in which the Time Of Arrival (TOA) and the Angle Of Arrival (AOA) measured by the closest Base Station (BS) are combined is presented to mitigate the effect of Non-Line-Of-Sight (NLOS) propagation in this paper. In order to reduce the feasible region of the Mobile Station (MS) and to improve the accuracy of the location estimation, the restrictions that TOA estimates are always greater than the true TOA values and the angle spreads are always smaller than the maximum angle spread determined by the Geometrically Based Single Bounce Circular Model (GBSBCM) are used. Its effectiveness is verified by the simulation.
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