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(jié)合圓位置線誤差、直線位置線誤差與參數(shù)誤差的關(guān)系,該文提出了一種利用所有基站測(cè)量的波達(dá)時(shí)間與最近一個(gè)基站測(cè)量的所有多徑的到達(dá)角進(jìn)行混合定位的方法.在該方法中,對(duì)波達(dá)時(shí)間用測(cè)量的波達(dá)時(shí)間總是大于等于視距傳播時(shí)間進(jìn)行約束,對(duì)到達(dá)角用GBSBCM確定的最大角度擴(kuò)展進(jìn)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(jié)果證明了該方法的有效性。
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關(guān)鍵詞:
- 定位; 波達(dá)時(shí)間; 到達(dá)角; 非視距傳播; 可行區(qū)域
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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