Simulation and Realization of Radar System for Positioning of Small Insects
| Autor: | Yung-Hsiang Chiang, 江詠翔 |
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| Rok vydání: | 2015 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 103 The aim of this thesis is to develop positioning and identification algorithms for a 3-dimensional high-resolution radar system. This radar system will be employed for positioning and identification of some small-sized creatures, such as red fire ants. Therefore, the developing radar system not only performs identification like a radio frequency identification (RFID) system but also performs positioning like a conventional radar system. In order to easily mount tags on small-sized creatures, a feasible solution is to used passive RFID technologies and employ some sophisticated algorithms on the reader side for positioning and identification. We use time division multiple access method to locate tags. At any instance, only a tag is awakened to active mode for positioning and the other tags are at sleep mode. After awaking the target tag by sending an ID code, the target tag will reflect signals that allows the reader to estimate the angle of arrival of the reflected signal. In this way, we can efficiently avoid the interference of different tags. However, the tags staying at sleep mode would leak some signal and cause interference because of the circuit imperfection. This thesis proposes an asynchronous cancellation algorithm to cancel the interference from the transmission antenna when measuring, and also proposes a positioning algorithm that can be used in the two-dimensional coordinate plane. The simulations show that increasing the number of iterations of the positioning algorithm will improve the accuracy and the performance is very close to that of the interference-free case at high output signal-to-noise ratio(SNR). The simulations also display that positioning error becomes smaller after cancellation and is stable at high output signal-to-noise ratio(SNR). |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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