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文章重点分析影响低轨四星时差定位系统精度的主要因素;首先,从四星时差定位的基本原理出发,对四星时差定位的模型和几何精度因子进行了详细的推导,并通过仿真分析了四星构型、时差测量精度、卫星位置误差、基线长度、星座投影面积等对四星时差定位系统精度的影响;通过比较可知,在相同参数条件下,采用Y形构形,减小时差测量误差、提高卫星定位精度、增加基线长度,增大星座投影面积均等均能够提高该系统的定位精度;在低轨四星定位系统应用场景中,四星构型、卫星绝对位置测量精度、基线长度以及星座投影面积对四星时差定位系统精度影响较大,时差测量精度和卫星相对位置测量精度对四星时差定位系统精度影响较小;而在实际任务中应权衡各因素的效费比,来保证定位精度。
The paper focuses on the analysis of the main factors influencing the accuracy of the low-orbit four-satellite time-lag positioning system. First, based on the basic principle of the four-satellite time-lapse positioning, the model and the geometric precision factor of the four-satellite time-lapse positioning are deduced in detail. Four-star configuration, time-lapse measurement accuracy, satellite position error, baseline length, constellation projection area and other four-satellite time-lag positioning system accuracy; through the comparison shows that under the same parameters, the use of Y-shaped configuration, reducing the time difference measurement Error, improve the satellite positioning accuracy, increase the baseline length and increase the constellation projection area can improve the positioning accuracy of the system; four-star low-rail positioning system applications, four-star configuration, satellite absolute position measurement accuracy, baseline length As well as the constellation projection area greatly affects the accuracy of the four-satellite time difference positioning system. The precision of the time difference measurement and the relative positioning accuracy of the satellite have less effect on the accuracy of the four-satellite time difference positioning system. In practical tasks, Ensure positioning accuracy.