低轨道卫星隐蔽通信快速捕获技术研究  

Fast Capture Technique for Concealing Communication of Low Earth Orbit Satellite

作　　者：韩航程[1] 安建平[1] 尚海英[1] 

机构地区：[1]北京理工大学信息与电子学院,北京100081

出　　处：《北京理工大学学报》2012年第5期492-497,共6页Transactions of Beijing Institute of Technology

基　　金：国家自然科学基金资助项目(61072048)

摘　　要：针对低轨道卫星隐蔽通信系统特有的接收机低信噪比、超大多普勒频偏及快速捕获要求等特点,提出一种时间频率二维准全并行多符号累积捕获实现算法,并对算法中关键参数进行优化设计.载荷样机测试结果表明,该算法在符号速率为1ksample/s,多普勒频偏为±50kHz,接收机信噪比Es/N0最小为3dB条件下,捕获时间优于100ms,漏检概率小于0.003,虚警概率小于3×10-6.Low-orbit satellite communication system has the features of low SNR receiver, large Doppler shift and fast capture requirement. To meet those demands in concealing communication, this article presents a time-frequency two-dimensional quasi parallel multisymbol cumulative capture algorithm. The critical parameters of the algorithm have been designed and optimized. The loaded prototype and signal processing platform have been built to test the performance of the designed algorithm. The test results show that all the indexes meet the project requirements. Under the conditions of that the symbol rate is 1 ksample/s, Doppler frequency shift is ±50 kHz and the receiver E/N is no more than 3 dB, the capture time is less than 100 ms and the probability of missed detection is less than 0. 003.

关 键 词：低轨道卫星 隐蔽通信 直接序列扩频系统 超大多普勒频偏 快速捕获 

分 类 号：TN953[电子电信—信号与信息处理]