针对无线电干涉定位系统(RIPS)受模糊解问题的制约,难以适用于大范围稀疏布设的无线传感器网络的缺点,提出了一种两频率间隔配置方法(two frequency intervals method,TFIM).通过理论和仿真分析,得到RIPS定位精度与测量频率数及测量系...针对无线电干涉定位系统(RIPS)受模糊解问题的制约,难以适用于大范围稀疏布设的无线传感器网络的缺点,提出了一种两频率间隔配置方法(two frequency intervals method,TFIM).通过理论和仿真分析,得到RIPS定位精度与测量频率数及测量系统占据的总带宽的平方成正比的结论.仿真与实验结果表明:在相同的测量频率数和带宽条件下,TFIM可以在保持定位精度的同时显著扩大节点的布设距离,克服了大距离布设时的系统定位精度不高的问题,拓展了RIPS的应用范围.展开更多
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 ...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.展开更多
文摘针对无线电干涉定位系统(RIPS)受模糊解问题的制约,难以适用于大范围稀疏布设的无线传感器网络的缺点,提出了一种两频率间隔配置方法(two frequency intervals method,TFIM).通过理论和仿真分析,得到RIPS定位精度与测量频率数及测量系统占据的总带宽的平方成正比的结论.仿真与实验结果表明:在相同的测量频率数和带宽条件下,TFIM可以在保持定位精度的同时显著扩大节点的布设距离,克服了大距离布设时的系统定位精度不高的问题,拓展了RIPS的应用范围.
基金partially supported by the National Nature Science Foundation of China under Grants 61301223,61174127,61221003, and 61273181the Nature Science Foundation of Shanghai under Grant 13ZR1421800the New Faculty Foundation of Ministry of Education of China under Grant 13Z102090106
文摘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.
