基于前置三阶相关检测的高性能直扩伪码捕获

PN code acquisition method based on prepositive 3-order correlated detection

为了提高无线电导航系统长伪码序列的检测概率,同时降低捕获时间,提出了一种带前置三阶相关检测的伪码捕获算法,即根据伪随机码和高斯噪声的三阶相关特性,首先实现本地伪码与接收伪码序列的码元相位同步,再用传统捕获方法进行伪码相位同步。理论分析和仿真结果表明,该方法能够有效提高捕获过程的检测概率,并降低捕获时间。

To increase the detection probability of long period PN （pseudo noise） code and decrease its acquisition time, a new method of 3-order correlated detection was proposed, that is, before the synchronization of pseudo random sequence, the chip phase should be synchronized firstly according to the characteristic of 3-order correlation of the PN code and additive white Gauss noise. Theoretical analysis and the results of simulation show that this method can effectively increase the detection probability and decrease the acquisition time.