论文标题
基于顺序多普勒移位基于最佳定位和与TOA同步
Sequential Doppler Shift based Optimal Localization and Synchronization with TOA
论文作者
论文摘要
多普勒转移是定位和同步（LAS）的重要衡量，可在各种实用系统中使用。现有关于LAS技术的研究时间分隔广播LAS系统（TDB）仅使用广播信号的顺序时间（TOA）测量。在本文中，我们通过利用顺序多普勒移位和TOA测量来开发TDB的新最佳LAS方法，即LAS-SDT。与使用运动和时钟漂移的用户设备（UDS）的常规TOA方法相比，它的准确性更高。开发了另外两种变体方法，即具有UD速度辅助的情况的LAS-SDT-V，而使用UD时钟漂移辅助的情况下，具有UD速度的情况和LAS-SDT-K。对于这些不同的情况，我们得出了Cramer-Rao下限（CRLB）。我们分析表明，估计的UD位置，时钟偏移，速度和时钟漂移的精度都显着高于仅使用TOAS的常规LAS方法的精度。数值结果证实了理论分析，并显示了LAS-SDT的最佳估计性能。
Doppler shift is an important measurement for localization and synchronization (LAS), and is available in various practical systems. Existing studies on LAS techniques in a time division broadcast LAS system (TDBS) only use sequential time-of-arrival (TOA) measurements from the broadcast signals. In this paper, we develop a new optimal LAS method in the TDBS, namely LAS-SDT, by taking advantage of the sequential Doppler shift and TOA measurements. It achieves higher accuracy compared with the conventional TOA-only method for user devices (UDs) with motion and clock drift. Another two variant methods, LAS-SDT-v for the case with UD velocity aiding, and LAS-SDT-k for the case with UD clock drift aiding, are developed. We derive the Cramer-Rao lower bound (CRLB) for these different cases. We show analytically that the accuracies of the estimated UD position, clock offset, velocity and clock drift are all significantly higher than those of the conventional LAS method using TOAs only. Numerical results corroborate the theoretical analysis and show the optimal estimation performance of the LAS-SDT.
