Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Localization using iterative angle of arrival method sharing snapshots of coherent subarrays | Kawakami and Ohtsuki EURASIP Journal on Advances in Signal Processing 2011 2011 46 http content 2011 1 46 o EURASIP Journal on Advances in Signal Processing a SpringerOpen Journal RESEARCH Open Access Localization using iterative angle of arrival method sharing snapshots of coherent subarrays Shun Kawakami and Tomoaki Ohtsuki Abstract In this paper we propose a localization method using iterative angle of arrival AOA method sharing snapshots of coherent subarrays. The conventional AOA method is restricted in some applications because array antenna used for receivers requires many antennas to improve localization accuracy. The proposed method improves localization accuracy without increasing elements of antenna arrays and thus the lower costs and smaller devices are expected. First we estimate rough location of source with each subarray-small number of antennas-in initial estimation. Then we configurate virtual arrays by sharing snapshots based on the initial AOAs estimate again with virtual arrays-large number of antennas-in update estimation and update the location iteratively. Simulation results show that the localization accuracy of the proposed method is better than that of the conventional method using the same number of antennas if the appropriate virtual arrays are configurated and the phase synchronization error between two subarrays is smaller than of a wavelength. Keywords localization angle of arrival antenna array virtual array Introduction Localization of sources is attracting a great deal of interest in mobile communications and other many applications. Global positioning system GPS is used in various applications such as location information service of cellular phone and car navigation system. However nodes require to equip with exclusive receivers that are expensive. More importantly GPS is unavailable indoor or underground. Accurate indoor localization plays an important role in home safety public services and other .
