A Novel Radio Interferometric Time Delay Tracking Scheme
This paper presents a novel sinusoidal signal time delay tracking scheme based on radio interferometric for wireless sensor networks. We first design an interference signal composed of two sinusoidals with different frequencies in a transmitter. Then a sinusoidal signal time delay tracking algorithm based on DTFT is also presented. Compared with the source-separated radio interferometric time delay estimation (RITDE) technology, the proposed scheme can directly acquire time delay between two rather than among four receivers. Hence it can be employed directly to the traditional time-difference-of-arrival (TDOA) localization algorithm. Simulation results confirm the efficiency and superior performance of the DTFT-based algorithm as compared to the existing filter-based approaches.