A Limit-Achievable Estimator for Range and Doppler Estimation in Pulse-Doppler Radar

This paper proposes a limit-achievable joint range and direction of arrival estimation method in pulse-Doppler radar, named sampling a posteriori (SAP). To evaluate the performance of the SAP, entropy error is introduced and it is proved that the empirical entropy error of the SAP achieves the theoretical entropy error when the number of snapshots tends to infinity. In order to reduce the computation burden of the SAP, a relaxation technique is adopted, which is based on a random number generator and the cumulative distribution function. Numerical simulation is carried out and results indicate that the relaxation technique can effectively reduce the computation burden of SAP at the cost of a insignificant estimation performance loss.