Wireless localization and navigation with the signal of opportunity by exploiting Doppler frequency

In this paper, we propose a new approach to track a moving target by measuring its radial velocities with respect to the anchor nodes. The receiver can extract the first channel path and use it to estimate the Doppler frequency and consequently the radial velocity. Based on the geometric relationship between the target and anchor nodes, we can find out the x- and y-axis coordinates of the target. Since our approach relies on the angle of arrival (AoA) information, no common time base is required either between the MS and each anchor node or among all anchor nodes. In addition, the AoA information is acquired from Doppler frequency, our approach does not need the antenna array that is required by the AoA-based method.