基于导频辅助的高动态信号捕获技术研究  

Research on High Dynamic Signal Capture Technology Based on Guide Frequency Assistance

作　　者：廖必燚 王永 孔宪仁[2] 丁国栋 戚耀文 LIAO Biyi;WANG Yong;KONG Xianren;DING Guodong;QI Yaowen(Shandong Aerospace Electronic Science and Technology Research Institute,Yantai 264006,China;School of Astronautics,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]山东航天电子科学技术研究所,山东烟台264006 [2]哈尔滨工业大学航天学院,哈尔滨150001

出　　处：《计算机测量与控制》2024年第12期251-256,279,共7页Computer Measurement &Control

摘　　要：针对卫星-高动态终端相对移动过程中速度和加速度高,造成多普勒频移跨度大、变化率高的问题,提出了一种导频辅助的高动态突发信号捕获技术;对卫星-终端通信链路的信道特性进行了研究,该技术采取基于FFT算法、频偏预补偿的对抗措施,构建了链路发送端和接收端的多普勒频移补偿信道模型;并设计了多帧头同步、导频辅助的新型架构,有效降低了低信噪比下帧传输的错误率;仿真结果表明:该算法达到1×10-5误码率指标时接收灵敏度提高了3 dB左右,满足高动态终端接入卫星移动通信系统的需求。Aiming at the problems of high speed and acceleration during the relative movement of satellite and high dynamic terminal,which cause large Doppler frequency shift span and high variation rate,apilot-assisted high dynamic burst signal capture technique is proposed;the study investigates the channel characteristics of the satellite-terminal communication link,and the technology adopts countermeasures based on the FFT algorithm and frequency bias pre-compensation,which constructs the Doppler frequency shift compensated channel models for the transmitter and receiver;and designs a new architecture of multi-frame header synchronization and pilot-assisted architecture,which effectively reduces the error rate of the frame transmission under the low signal-to-noise ratio;the simulation results show that:the algorithm achieves a 1×10-5 BER index with an improvement in the reception sensitivity of approximately 3 dB,which meets the demand of high dynamic terminal access to the satellite mobile communication system.

关 键 词：高动态 突发通信 卫星捕获 FFT 导频辅助 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]