基于导频辅助的高动态信号捕获技术研究
2024,32(12):251-256
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1e-5误码率指标时接收灵敏度提高了3dB左右，满足高动态终端接入卫星移动通信系统的需求。
关键词：高动态;突发通信;卫星捕获;FFT;导频辅助
Research on high dynamic signal capture technology based on guide frequency assistance
Abstract：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, a pilot-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 1e-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.
Key words：highly dynamic; burst communication; satellite capture; FFT; pilot-assisted
收稿日期：2024-09-05
基金项目：
