Abstract
This paper made analysis of present situation and development trend of the positioning in small range at first and then made summary about the technologies and algorithms of the positioning in small range. According to the above content, wireless location technology has broad application prospects, especially the applications related to the location in small range. This new wireless positioning scheme mainly aims at improving the positioning method based on time difference of arrival (TDOA) in small range. This paper designs an improved positioning system which uses matched filter to calculate TDOA value. Then the system estimated the position of signal source by Chan's algorithm and used the first-order difference method to optimize the positioning results. From the simulation results by Matlab, it can be seen that this improved positioning system has improved the positioning accuracy and met the demand of the high precision positioning.
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