基于载波环的低轨卫星扩频正交频分复用频偏估计方法
By introducing a carrier loop into the low-Earth orbit satellite spread spectrum orthogonal frequency division multiplexing communication system and utilizing the closed-loop feedback mechanism of frequency-locked loop and phase-locked loop, the problems of frequency estimation accuracy and stability were solved, high-precision frequency observation was achieved, and reliable Doppler observations were provided for the low-Earth orbit satellite positioning system.
CN122179282BActive Publication Date: 2026-07-17NORTHWESTERN POLYTECHNICAL UNIV
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NORTHWESTERN POLYTECHNICAL UNIV
- Filing Date
- 2026-05-11
- Publication Date
- 2026-07-17
Smart Images
Figure CN122179282B_ABST
Abstract
本申请提出一种基于载波环的低轨卫星扩频正交频分复用频偏估计方法，属于卫星通信及信号处理技术领域。该方法包括以下步骤：接收机将整帧序列按时间顺序划分为多个结构相同的累加块；分别计算当前累加块中的每个符号周期对应的残余载波的相位旋转因子；依次分别计算每个子载波在当前累加块中的每个符号周期的载波剥离值和载波相关值；分别计算每个子载波在当前累加块中对应的累加相关值；根据当前累加块的索引，判断其载波环路状态，并计算下一个累加块的载波频率控制字；迭代完成对所有累加块的处理，并将载波环路收敛后得到的所有载波频率控制字的平均值作为整帧序列的频偏估计值。本申请能够提供高精度、连续稳定的频率观测值。
Need to check novelty before this filing date? Find Prior Art