Abstract: Based on the closed-loop with a pre-loop estimator, the optimum seeking method is proposed into the fast acquisition algorithm of the PN code, a new algorithm is proposed the Marokv Model is set up, and the function of the mean acquisition time and its variance are deduced. The performance of acquisition is simulated. The result of computer simulation indicates that the algorithm can improve the performance and that it is more practical.

Key words: direct sequence spread_spectrum systems, pre_loop estimator, optimum seeking, fast-acquisiton