Abstract:

In the passive radar system, the existence of transmitter and receiver position errors will significantly reduce the target localization accuracy. In this paper, the transmitter and receiver position errors are considered in the passive rodar target localization model based on direction of arrival (DOA) and time difference of arrival (TDOA) measurements. An algebraic solution is proposed for target position estimation. Firstly, the DOA and TDOA measurement equations are linearized, and then by considering the errors in the location equations, the weighted least squares estimation is employed to solve the equations. By iteratively updating the weighted matrix, the optimum estimation of the target position can be obtained. The Cramer-Rao lower bound (CRLB) for DOA-TDOA-based target localization with transmitter and receiver position errors is derived, and the theoretical localization accuracy is shown analytically to achieve the CRLB. Simulation results demonstrate that the proposed solution outperforms existing algorithms in terms of localization accuracy, and achieves the CRLB even in the presence of transmitter and receiver position errors.

Key words: passive radar, direction of arrival (DOA), time difference of arrival (TDOA), position error, weighted least squares (WLS)