Constructing a continuous phase time history from TDMA signals for opportunistic navigation
Constructing a continuous phase time history from TDMA signals for opportunistic navigation
复制标题
从 TDMA 信号构建连续相位时间历史以实现机会导航
DOI：
10.1109/plans.2012.6236977
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
T. Humphreys
中科院分区：
文献类型：
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作者：
Kenneth M. Pesyna;Z. Kassas;T. Humphreys
发展了一种从时分多址(TDMA)信号的非连续相位突发中重建连续相位时间历史的技术。连续的相位时间历史便于在机会主义导航框架内将TDMA信号用作机会信号(SOP)。由于TDMA信号在当今无线通信市场中的广泛使用和可用性，它是机会导航的有吸引力的候选SOP。这里提出的相位重建技术结合了整数最小二乘技术，用于估计每个TDMA相位突发开始时的相位模糊，以及卡尔曼滤波和平滑器，用于消除这些模糊，并最佳地将突发“缝合”在一起。建立了蒙特卡罗仿真测试环境，研究了该相位重构技术对载噪比、接收机时钟质量、时分多址发射机时钟质量、视距加速不确定度和TDMA突发结构等系统参数的敏感性。仿真结果表明，成功的载波相位重构最大程度地依赖于TDMA突发周期、收发端时钟的相位随机游走效应、传播效应和距离误差。
A technique is developed for reconstructing a continuous phase time history from the noncontinuous phase bursts of time division multiple access (TDMA) signals. A continuous phase time history facilitates exploitation of TDMA signals as signals of opportunity (SOPs) within an opportunistic navigation framework. Because of their widespread use and availability in today's wireless communication market, TDMA signals are attractive candidate SOPs for opportunistic navigation. The phase reconstruction technique presented here combines an integer least squares technique for estimating phase ambiguities at the beginning of each TDMA phase burst with a Kalman filter and smoother for removing these ambiguities and optimally “stitching” the bursts together. A Monte-Carlo-type simulation and test environment has been developed to investigate the sensitivity of the proposed phase reconstruction technique to various system parameters, namely, carrier-to-noise ratio, receiver clock quality, TDMA transmitter clock quality, line-of-sight acceleration uncertainty, and TDMA burst structure. Simulation results indicate that successful carrier phase reconstruction is most strongly dependent on the TDMA burst period and on the combined phase random walk effect of the receiver and transmitter clocks, the propagation effects, and the range errors.