移动通信2025，Vol.49Issue(6)：63-68,6.DOI:10.3969/j.issn.1006-1010.20250424-0007
智能超表面辅助的基于OTFS的卫星多普勒估计与轨道参数估计
Doppler Estimation and Orbital Parameter Estimation of Satellites Based on OTFS Aided by Reconfigurable Intelligent Surfaces
摘要
Abstract
With the in-depth research of 6G communication,the satellite Internet,a key part of the space-air-ground integrated network,has gained more attention.Facing the challenges of users' lack of prior satellite ephemeris knowledge and significant free-space path loss,a method integrating Doppler shift estimation,satellite orbital parameter inversion,and RIS dynamic beam-forming based on orthogonal time-frequency space(OTFS)modulation is proposed.Firstly,the fractional Doppler property of OTFS modulation is used to estimate complex time-varying Doppler shifts from the received signals.Then,a damped gradient descent algorithm based on satellite orbital parameters is proposed through a dynamic analysis model to calculate the orbital parameters and real-time position.Furthermore,a strategy for dynamically optimizing RIS reflecting element phases is presented based on channel state information.Therefore,coherent beam-forming is used to compensate for path loss and enhance the received signal power.Simulation results show that the proposed method can achieve real-time satellite positioning with 100-meter-level accuracy and a notable communication rate improvement without prior ephemeris information,offering theoretical and technical support for reliable satellite-to-ground dynamic communication.关键词
低轨卫星/智能超表面/正交时频空间调制/分数多普勒Key words
6G satellite communications/multi-level coding modulation/hybrid automatic repeat request/incremental redundancy分类
信息技术与安全科学引用本文复制引用
万雨,陈文,武庆庆..智能超表面辅助的基于OTFS的卫星多普勒估计与轨道参数估计[J].移动通信,2025,49(6):63-68,6.基金项目
浦东新区科技发展基金产学研专项(PKX2024-D10) （PKX2024-D10）
