高速飞行器相对低轨卫星的多普勒频移预测捕获方法
Doppler Frequency Shift Prediction and Acquisition Method for High-Speed Aircraft Relative to Low Orbit Satellites
李毅 1周康燕2
作者信息
- 1. 中国星网网络应用研究院有限公司,北京 100001
- 2. 中国星网网络系统研究院有限公司,北京 100001
- 折叠
摘要
高速飞行器与低轨卫星的快速相对位移会导致多普勒频移,影响信号的同步捕获与解调性能.针对这一问题,提出一种结合飞行器PVT信息和低轨卫星星历信息的多普勒频移预测捕获方法.通过解析方法计算相对速度,预测多普勒频移范围,并在预设区间内采用小数多普勒估计与补偿,解决了传统方法中资源消耗高、精度不够的问题.仿真表明,补偿后的最大频移残差显著低于传统方法的误差范围.
Abstract
The rapid relative displacement between high-speed aircraft and low-Earth orbit(LEO)satellites causes Doppler frequency shifts,affecting signal synchronization,acquisition,and demodulation performance.To address this issue,a Doppler shift prediction ac-quisition method combining aircraft PVT(Position,Velocity,Time)information and LEO satellite ephemeris data was proposed.The relative velocity was calculated using an analytical approach to predict the Doppler shift range.Within the preset interval,fractional Doppler estimation and compensation were applied,solved the problems of high resource consumption and insufficient accuracy in tra-ditional methods.Simulations showed that the maximum residual frequency offset after compensation is significantly lower than the er-ror range of traditional methods.
关键词
多普勒频移/高速飞行器/低轨卫星/信号解调Key words
Doppler frequency shift/high-speed aircraft/low orbit satellites/signal demodulation引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据