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中文摘要：
多点定位系统中,目标信号TOA测量精度直接决定了系统对目标的定位精度,而目标信号TOA测量精度取决于提供系统时钟的晶振的准确度和稳定度。针对多点定位系统中目标信号TOA测量准确度的具体问题,分析晶振频率偏移和GPS秒脉冲抖动对TOA测量准确度的影响,导出基于Kalman滤波的目标信号TOA测量校正方法。数值仿真证明此方法可以有效地改善目标信号TOA的测量准确度,对提高多点定位系统定位性能具有较强的现实意义与实用价值。
英文摘要：
For multilateration,the positioning accuracy is directly determined by signal TOA measurement of a target,while the TOA accuracy depends on the preciseness and stability of the crystal oscillator’ which provides the clock for the system.Aiming at the TOA measurement of multilateration,the impact of frequency offset and GPS PPS on TOA measurement accuracy is analyzed,and the algorithm of TOA measurement calibration based on Kalman filtering is derived.Numerical simulation shows that this algorithm could effectively raise the TOA measurement accuracy,and is of practical value in improving the performance of multilateration system.
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