针对长伪码序列捕获中滑动串行捕获算法计算复杂度过高的问题,提出了一种自适应检测窗伪码捕获算法。该方法通过在不同信噪比条件下自适应构建检测窗,快速确定其在接收伪码序列中的位置信息,直接生成与接收伪码序列粗同步的本地伪码序列,完成捕获。仿真结果表明该方法大大降低计算复杂度并能在低信噪比条件下稳定工作。较之滑动串行捕获算法,该方法有更低的硬件实现复杂度,易于工程实现。

As the high computational complexity of sliding serial acquisition algorithm in the process of long PN sequence acquisition, an PN code acquisition algorithm for self-adaptive detection window was proposed. Through constructing self-adaptive detection window under the condition of different SNR, this method could quickly determine the position information in the process of receiving PN sequence, and the local PN sequence which was coarse synchronizing with the received PN sequence was directly generated to complete acquisition. Simulation results showed that this method could greatly reduce the computational complexity and could work steadily under the condition of low SNR. Compared with sliding serial acquisition algorithm, it had lower hardware implementation complexity, and it was easy to implement.