A new method for summation of short time CAF’s based on RLCS motion

Cross ambiguity function is a common method for joint estimation of TDOA/FDOA. CAF performance degrades in wideband situation. The maximum likelihood estimator in wideband model contains data resampling. Because of intensive computational burden data resampling isnpsilat viewed as a practical method. Calculation of short time CAFs and summation of them is suggested as a practical alternative method. Different summation methods were suggested for compensation of TDOA variation in the integration time. In this paper first with an experimental test we find the areas in which FDOA variations is noticeable and we indicate that these regions are big enough not to be ignored. Then a new method for summation of sequential CAFs is presented. The proposed method compensates variation of both TDOA and FDOA together and via this method, detection ability of peak in combined CAF is improved. The proposed method is based on recti linear constant speed (RLSC) motion.