一种改进的两级相干累加码捕获方法  

An Improved Two-stage Coherent Accumulation PN Code Acquisition Method

作　　者：邓强[1] 

机构地区：[1]中国西南电子技术研究所,成都610036

出　　处：《电讯技术》2012年第5期704-708,共5页Telecommunication Engineering

摘　　要：为了提高伪码捕获性能,在分析常用相干-非相干码捕获平方损耗及捕获性能的基础上,提出了一种改进的两级相干累加伪码捕获算法。通过在第二级累加之前对多普勒频偏进行有效补偿,实现了相干累加,提高了捕获性能;采用FFT实现,解决了工程实现的难度。与传统的相干-非相干累加码捕获算法相比,该方法具有捕获门限低、多普勒频偏可估计等优点。计算机仿真表明,该方法仅比理论值恶化1 dB,具有高效的捕获性能。同时,分析表明该方法实现简单、快捷,具有很好的工程应用前景。In order to improve the performance of PN code acquisition, a high efficient PN code acquisition approach of two-level coherent accumulation is proposed based on the analysis of traditional coherent - noncoherent PN code acquisition method. Doppler-shift is compensated before the second accumulation, which realizes co- herent accumulation and improves the performance of PN code acquisition. The difficulty of engineering realization is resolved by using FFT. Computer simulations show that this method has only 1 dB attenuation in comparison with the theoretical one＇s. Furthermore, it is simple and fast to realize and has wide application prospect.

关 键 词：扩频 伪码捕获 相干-非相干 两级相干累加 多普勒频偏 

分 类 号：TN911[电子电信—通信与信息系统]