高速星间链路的载波恢复方法研究

摘要

In view of the linited power and volume of the satellite platform,this paper proposes a method of coherent carrier recovery for high speed intersatellite laser transmission link.The method is based on the classical architecture of Costas loop and adopts an analog-digital mixed circuit,in which the error extraction is realized by means of analog multiplier and loop filter,and the adjustment of vibration error is realized in FPGA.The method has such advantages as low complexity and good tracking performance,which is suitable for project implementation.The test results show that the proposed method can realize the carrier recovery for modulation mode of BPSK,symbol rate of 1.5 G symbol/second and initial frequency error of 15 MHz.The demodulation loss is less than 1 dB.%针对星载平台功耗和体积受限的情况,提出了一种适用于高速星间激光传输链路相干解调的载波恢复方法.该方法基于经典的科斯塔斯环架构,采用模数混合的电路结构,利用模拟乘法器实现误差提取、FPGA实现环路滤波和本振误差的调整,具有实现复杂度低、捕获跟踪性能好等优点,适合工程实现.测试结果表明,该方法可实现调制方式为BPSK、符号速率为1.5 G符号/s、初始频率误差为15 MHz的载波恢复,解调损失小于1 dB.