A High Precision Direction-Finding Method Based on Multi-Baseline for Target Rescue
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A High Precision Direction-Finding Method Based on Multi-Baseline for Target Rescue Hongwei Zhao 1,2
&
Zichun Zhang 1 & Xiaozhu Shi 2 & Haowei Xu 1
# Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Target rescue is an important application in the Internet of Things (IoT), and the direction-finding (DF) is an essential technology for the target rescue. The DF technology based on the phase comparison method is widely used in target rescue. However, due to the phase ambiguity, the phase comparison method is difficult to meet the needs of high precision DF. The long and short baseline method can eliminate the phase ambiguity in a certain angle range, but it cannot accurately direction in all directions. In this article, we propose a high precision DF method based on the multi-baseline and multi-antenna for target rescue. Firstly, the performance of the proposed method in eliminating the inhomogeneity and azimuth ambiguity in single antenna pairs is analyzed theoretically. Then, a measurement system configured of a cycle array with eight antennas is presented to validate the practicability of the proposed method. Finally, the measurement system is verified by experiments conducted in both anechoic chamber and the out-field scenarios. The experiment results demonstrate that the error of the proposed DF method is within 2° in the anechoic chamber and within 5° in out-field. Therefore, the proposed multi-baseline and multi-antenna method can be used for high precision DF for the target rescue. Keywords High precision . Direction finding . Phase comparison . Multi-baseline . Target rescue
1 Introduction With the continuous development of the Internet of Things (IoT) technology, the application of the IoT has gradually penetrated into our lives, such as smart home, target rescue and so on. In the target rescue applications, the target search and rescue (SAR) are crucial technologies and it is very important to determine the position and direction of the target quickly and accurately. The application of the IoT in target rescue can quickly obtain the relevant target information and help us make decisions for target rescue. Therefore, the IoT technology greatly improves the rescue efficiency. When a target broadcasts the distress signal information, the SAR organization should quickly obtain the direction of the target so as to perform real-time radio monitoring and accurately rescue. In the rescue of ships in distress or crashed
* Hongwei Zhao [email protected] 1
School of Electronics and Information, Northwestern Polytechnical University, Xi’an 710072, China
2
State Key Laboratory of Air Traffic Management System and Technology, Nanjing, China
aircraft, the existing airborne/shipborne automatic identification system (AIS) can effectively obtain the relevant information of the target, and the SAR organization rushes to the scene of the accident according to the information [1]. However, due to the complexity of marine environment and the effect of the current and gale, the target in dis
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