Abstract
Traditional two-step passive localization methods need to extract the parameters like the direction of arrival (DOA), time of arrival (TOA), and time difference of arrival (TDOA) from the original data to determine the source position, which causes the poor positioning accuracy due to error accumulation. In this paper, a direct position determination (DPD) method is proposed to improve the positioning accuracy and robustness, which is based on a correlation algorithm. Firstly, the cost function directly related to the location of the source can be established by synthesizing the data received by multiantenna in the frequency domain. Then, the position of the source is estimated by the correlation DPD method to search the monitoring area. Compared to the improved TDOA algorithm and Least Squares DPD algorithm, the proposed method shows better localization accuracy of different SNRs. Finally, based on real measured data, it can be seen that the results of the proposed algorithm are better than the improved TDOA algorithm.
Highlights
Wireless positioning is an important research direction in the civilian and military fields [1]
Root mean square error (RMSE) is employed to verify the performance of the algorithm; the expression of it is sffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi where M is the number of Monte Carlo experiments, p is the true location of the unknown source, and pm is the estimation result of the source location of the m‐th Monte Carlo experiment
direct position determination (DPD) algorithm has higher positioning accuracy than the traditional two-step positioning method, but most of the existing direct positioning technologies are aimed at narrowband signals
Summary
Wireless positioning is an important research direction in the civilian and military fields [1]. Wireless Communications and Mobile Computing two-step positioning, the direct location technology can directly estimate the emitter position without parameter estimation by using the received signal [12]. It avoids the information loss caused by the two-step positioning method and obtains higher positioning accuracy. A new direct location method using a multiple antenna array (DPD) algorithm was proposed in [18] This method uses the cross-correlation matrix (CCM) of the received signals to estimate the position of the emitter directly. We propose a frequency domain direct position determination method to improve the location accuracy of emitters in distributed multiantenna scenarios. The results show that the performance of the proposed algorithm has been improved (3) The proposed algorithm is used to process the measured data, and the result of the target location is obviously better than that of the TDOA improved algorithm
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