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This paper analyzes the observability of estimating simultaneously the initial position and velocity of a constant velocity source by two fixed receivers using TDOA measurements observed many a time. From the geometrical means of vector operations, it arrives at the conclusion that the conditions are similar to those in the general source localization by multi-receivers using TDOA. Then the Cramer-Rao...
This paper considers the low-level feature modeling problem in image spam classification, in which most of the prevalent content based spam filters are shown to be inefficient because their OCR procedure are vulnerable to text obscuring attacks from spammers. We first built up a basic feature set through a low-level feature extraction process, and then proposed a stepwise regression method to determine...
High-resolution satellite images (HRSI) at sub-5m footprint such as IKONOS and SPOT-5 HRG/HRS images are becoming increasingly available to the earth observation community and their respective clients. SPOT-5 imagery is one of the main data sources for the project of West China topographic mapping (WChTM) which has been approved by the State Council of China in year 2006. In this paper, we present...
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