一种基于二分试探法的相干扩频快捕系统

利用辅助序列与接收PN码的线性相关性,在搜索方向判决准确的前提下,折半的查找范围对应折半的误差范围,达到应用二分法大步进缩小查找范围,从而有效的加快捕获速度,与常规步进滑动相关法相比,该捕获系统能够有效改善长PN码的捕获性能。

A Coherent PN Acquisition Scheme Based Bisector Search Algorithm

By utilizing the wide cross-correlation function about the input signal and an auxiliary sequence,a scheme is proposed to accelerate coherent pseudonoise(PN) code acquisition in direct sequence spread spectrum(DS/SS) communications.The search range is reduced by half based the high estimation probability for the adjust direction.About some times iterations,the estimation error about the input signal can satisfy the acquisition.Obviously,the receiver is appreciative especially under the long PN communications for its ef- ficient acquisition.In addition,the mean acquisition time and its variance are analyzed and simulated.Comparing with the conventional coherent serial search receiver,the result shows that the receiver presentad here can improve the acquisition performance.