Direct Localization Based on Motion Analysis of Single-Station Using TOA

摘要

Single-station localization of a stationary target using TOA(time of arrival) is considered. Conventional methods locate the target by estimating TOA-rate of the received pulse sequences in that TOA-rate is equivalent to relative velocity, and the estimation of relative velocity is widely accepted to be necessary for improving location performance. In this paper, TOA sequences are divided into consecutive slices firstly as conventional methods. Based on the motion analysis of each slice, a direct TOA localization model involving the known observer velocities is established. By introducing the DPD (direct position determination) technique and using TOA rather than the TOA-rate., a new TOA-DPD method is proposed to accomplish the localization. Then Newton-iterative algorithm is adopted to estimate the unknown target position and other nuisance parameters jointly. GDOP(geometric dilution of precision) of TOA-DPD is also derived along with TOA-rate localization method, and the comparative analysis shows that the TOA-DPD method has lower bound than the TOA-rate method. The numerical simulations demonstrate that the Newton-iterative TOA-DPD algorithm can reach the CRLB(Cramer-Rao lower bound).