Radio-Interferometric Object Trajectory Estimation

In this paper a novel radio-interferometric object trajectory estimation method is proposed, which can be used to track moving objects. The system utilizes a low number of fixed infrastructure nodes equipped with radio transceivers, and the tracked object also carries a simple transceiver. Selected transmitter infrastructure nodes produce interference signals at the fixed infrastructure receivers and the tracked receiver. Transmitter and receiver roles are rotated, thus multiple interference signals are produced, which is measured by synchronized receiver pairs. Measurements are then compared to pre-computed phase maps while the object is moving. During object movement the system resolves position ambiguities and the exact object trajectory is determined. The performance of the proposed method is illustrated by simulation examples and real measurements.