Dual-Tone Radio Interferometric Positioning Systems for Multi-Target Localization Using a Single Mobile Anchor  

作　　者：LI Li'an WANG Yiyin MA Xiaoli CHEN Cailian GUAN Xinping 

机构地区：[1]Department of Automation,Shanghai Jiao Tong University,and Key Laboratory of System Control and Information Processing,Ministry of Education of China [2]School of Electrical & Computer Engineering,Georgia Institute of Technology

出　　处：《China Communications》2015年第1期25-35,共11页中国通信（英文版）

基　　金：partially supported by the National Nature Science Foundation of China under Grants 61301223,61174127,61221003, and 61273181;the Nature Science Foundation of Shanghai under Grant 13ZR1421800;the New Faculty Foundation of Ministry of Education of China under Grant 13Z102090106

摘　　要：In this paper, a low-cost dualtone radio interferometric positioning system using a single mobile anchor is proposed to locate multiple targets at the same time. We name it mDRIPS. In mDRIPS, each target continuously transmits a dual-tone signal with its dedicated frequencies, and the mobile anchor receives the signals at different positions along its trajectory, Neither time synchronization between the mobile anchor and the targets nor time synchronization among the targets is required. We take the instability of targets clocks into consideration and develop an ESPRIT-type algorithm to estimate frequencies of each dual-tone signal. Furthermore, the time of arrival （TOA） of each target signal is extracted from the phase estimates of the received dual-tone signals. After measuring several TOAs at different locations along the anchor＇s trajectory, each target can be located. Since the frequency difference of the two tones of each dualtone signal is designed to be smaller than the channel coherence bandwidth, the same fading effect on these two tones can be eliminated. Moreover, the integer ambiguity problem due to phase wrapping is investigated, and a localization algorithm to deal with a simplified ambiguity problem is proposed. Numerical results demonstrate the efficiency of the proposed mDRIPS.In this paper,a low-cost dualtone radio interferometric positioning system using a single mobile anchor is proposed to locate multiple targets at the same time.We name it mDRIPS.In mDRIPS,each target continuously transmits a dual-tone signal with its dedicated frequencies,and the mobile anchor receives the signals at different positions along its trajectory.Neither time synchronization between the mobile anchor and the targets nor time synchronization among the targets is required.We take the instability of targets clocks into consideration and develop an ESPRIT-type algorithm to estimate frequencies of each dual-tone signal.Furthermore,the time of arrival(TOA) of each target signal is extracted from the phase estimates of the received dual-tone signals.After measuring several TOAs at different locations along the anchor's trajectory,each target can be located.Since the frequency difference of the two tones of each dualtone signal is designed to be smaller than the channel coherence bandwidth,the same fading effect on these two tones can be eliminated.Moreover,the integer ambiguity problem due to phase wrapping is investigated,and a localization algorithm to deal with a simplified ambiguity problem is proposed.Numerical results demonstrate the efficiency of the proposed mDRlPS.

关 键 词：RANGING LOCALIZATION mobile anchor radio interferometry oscillator instability 

分 类 号：TN92[电子电信—通信与信息系统] TP274[电子电信—信息与通信工程]