基于智能天线的三维直扩序列快速捕获算法

Three dimensional acquisition for PN sequence by multiple antennas technique

提出了一种基于智能天线的三维捕获算法,利用智能天线的波束成形技术,将空间域等分为几个搜索区域,再对每个空间搜索区域进行频域-时域的二维搜索.给出了该算法的检测概率、虚警概率和平均捕获时间等公式.计算机模拟结果显示,对周期为255的伪随机码而言,8分区新算法在正常工作条件下相对同等复杂程度的匹配滤波算法至少减小平均捕获时间90%.

A three-dimensional acquisition algorithm based on antenna arrays is proposed, in which the beamforming technique is used to divide the spatial domain into several nonoverlapping and evenly cells. Two dimensional delay and frequency domain was searched in each spatial cell. The correct detection probability, false alarming probability and mean acquisition time of the proposed method was derived. Numerical results show that the proposed method can achieve the acquisition at least ten times faster than that of conventional match-filter method for PN sequences with period 255 in the carrier-to-noise （C/N） ratio in normal working condition.