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多径传播是无线定位系统中引起定位误差的主要原因。采取适当的方法减轻多径的影响是基于时间的无线定位系统中TOA估计的关键。提出了一种提高TOA测量准确性的简单而有效的方法。仿真结果表明:采取边缘检测方法,并适当的增加观察时间,可以实现比传统的峰值检测可靠的TOA测量值。
Multi-path propagation is the main cause of positioning error in wireless positioning system. Taking appropriate measures to mitigate the effects of multipath is the key to TOA estimation in time-based wireless positioning systems. A simple and effective method to improve the accuracy of TOA measurement is proposed. The simulation results show that using the edge detection method and appropriately increasing the observation time can achieve a reliable TOA measurement compared with the traditional peak detection.