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May 2008Accurate Localization of Low-level Radioactive Source Under Noise and Measurement Errors ∗

By Jren-chit Chin, David K. Y. Yau, Nageswara S. V. Rao, Yong Yang, Chris Y. T. Ma and Mallikarjun ShankarJren-chit Chin, Yong Yang, David K. Y. Yau, Chris Y. T. Ma, Nageswara S. V. Rao and Mallikarjun Shankar

Abstract

The localization of a radioactive source can be solved in closed-form using 4 ideal sensors and the Apollonius circle in a noise- and error-free environment. When measurement errors and noise such as background radiation are considered, a larger number of sensors is needed to produce accurate results, particularly for extremely low source intensities. In this paper, we present an efficient fusion algorithm that can exploit measurements from n sensors to improve the localization accuracy, and show how the accuracy scales with n. We report testbed results for a 0.911 μCi source to illustrate the effectiveness of our algorithm, in particular performance comparisons with state-of-the-art fusion algorithms based on Mean of Estimates (MoE) and Maximum Likelihood Estimation (MLE). We show that ITP is mor

Year: 2010
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