公开(公告)号：WO2015143252A1

公开(公告)日：2015-09-24

申请号：PCT/US2015/021615

申请日：2015-03-19

Applicant: HUGHES NETWORK SYSTEMS, LLC

Inventor： VASAVADA, Yash ,  RAVISHANKAR, Channasandra ,  ARUR, Deepak ,  PARR, Michael

IPC: H04B7/185

CPC classification number: H04B7/1851 ,  H04B7/185 ,  H04B7/195 ,  H04W56/00

Abstract: A synchronization approach is provided that compensates for the large Doppler offset of the satellites in a LEO satellite system by exploiting the predictable and deterministic nature of the Doppler component, and thereby simplifies the delay and the Doppler domain uncertainty ranges that the physical layer receivers have to resolve. The compensation is based on the known ephemeris information of the LEO satellite and the known positions of the gateway (GW) and the user terminal (UT) on the ground. Utilizing the deterministic component of the LEO Doppler, the synchronization process continually tracks and compensates for the time-varying offsets between the GW and UT frame timing, frame numbering (FN), symbol timings, and Doppler-induced scaling of center frequency and the signal bandwidth.

Abstract translation: 提供了同步方法，其通过利用多普勒分量的可预测和确定性来补偿LEO卫星系统中的卫星的大的多普勒偏移，从而简化了物理层接收机必须具有的延迟和多普勒域不确定性范围 解决。 补偿基于LEO卫星的已知星历信息和地面上的网关（GW）和用户终端（UT）的已知位置。 利用LEO多普勒的确定性分量，同步过程连续地跟踪和补偿GW与UT帧定时，帧编号（FN），符号定时和中心频率的多普勒感应缩放之间的时变偏移 带宽。