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为了提高近地空间伪卫星定位系统的定位精度,针对其中对定位精度影响较大的浮空器布站方式,采用了数值仿真方法进行了分析。仿真模型将浮空器布设成正方型和“Y”型,分别布设在不同的高度和距离上,从而得到不同的GDOP(几何精度因子)和PDOP(空间位置误差系数)。分析结果表明,如果浮空器以正方形布设,地面用户定位的GDOP值的分布不均衡,差异性较大;以“Y”型布设,得到的GDOP值优于正方形布设的情形,在相同的仿真参数下,精度提高近1个数量级。建议在浮空器布设时尽可能布成以其中一个站为中心的等边三角形,布站时尽量将三角形下面2个端点靠近后方上空,这样能够得到比较均衡、精度较高的定位效果。
In order to improve the positioning accuracy of Pseudolites positioning system in near-Earth space, a numerical simulation method is used to analyze the layout of the aerosols which has a great influence on the positioning accuracy. The simulation model maps the aerostats into a square and a “Y” shape, each at different heights and distances, resulting in different GDOPs (geometric accuracy factors) and PDOPs (space position error coefficients). The results show that if the aerostats are arranged in a square, the GDOP values of the users located in the ground are unevenly distributed and the difference is relatively large. In the case of the “Y” arrangement, the obtained GDOP values are better than those in the square layout. The simulation parameters, the accuracy increased by nearly 1 order of magnitude. It is suggested that the layout of the aerostat should be distributed as much as possible to an equilateral triangle centered on one of the stations. When distributing the station, try to place the two endpoints below the triangle close to the rear, so as to obtain a more balanced and accurate positioning effect.