低轨卫星长伪码快速捕获技术  

A Long Code Rapid Acquisition Technique of LEO Satellite

作　　者：张楠楠 李悦[2] 苏辉[2] 

机构地区：[1]解放军91876部队通信修理所,河北秦皇岛066203 [2]海军装备研究院,北京100161

出　　处：《现代军事通信》2012年第2期25-27,37,共4页

摘　　要：针对低轨卫星（LEO）扩频通信系统的长伪码快速捕获，本文提出了一种改进的mm—FFT捕获算法。该算法基于部分匹配滤波器及FFT校频技术（PMF—FFT），利用复合扩频码实现长伪码快速捕获。通过这种算法在减少捕获时间的同时极大的节省了硬件资源，在要求小体积、低功耗的LEO卫星小型化终端研制中有广阔的应用前景。论文对捕获算法原理进行了分析和推导。仿真结果表明，在高斯白噪声的情况下，该算法能够在较低信噪比的情况下得到较好的捕获性能。According to the long PN code rapid acquisition of LEO satellite spread spectrum communica- tion, an improved mm-FFT acquisition algorithm is described in this paper. By using the partial matched filter and FFT frequency adjusting technology as well as the complex spread spectrum sequence, this algo- rithm reduces the acquisition time, and meanwhile saves the hardware resource effectively, which can be used in the LEO satellite mini terminal. The principle of the acquisition algorithm is analyzed, and the simulation result indicates that the algorithm works well in the condition of low SNR and AWGN.

关 键 词：低轨卫星 长伪码快捕 复合扩频 部分匹配滤波器 

分 类 号：TN914.42[电子电信—通信与信息系统]