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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。
Multi-point positioning system, the TOA measurement accuracy of the target signal directly determines the positioning accuracy of the target system, and the TOA measurement accuracy of the target signal depends on the accuracy and stability of the crystal oscillator to provide the system clock. Aiming at the problem of TOA measurement accuracy in multipoint positioning system, the influence of crystal frequency offset and GPS second pulse jitter on the TOA measurement accuracy is analyzed. The TOA measurement and correction method based on Kalman filter is derived. The numerical simulation proves that this method can effectively improve the measurement accuracy of TOA signal and has strong practical and practical value for improving the positioning performance of multi-point positioning system.