目标高度对广域多点定位系统精度的影响

Influence of Target Height on Location Accuracy in Wide Area Multilateration

广域多点定位技术是对航路和终端区域的飞行器进行监视的新技术,由于多个接收站点通常布局在地面上,站点的基线长度和飞行器高度对系统的定位精度至关重要。根据双曲线/面定位技术,导出了最小二乘法解算目标位置时定位精度与高度误差的关系,然后对同高度层和高度层变化的水平精度稀释和垂直精度稀释进行了分析和仿真,证明了高度变化对精度影响显著的结论。最后,讨论了站点布局的作用,在高度不变的情况下,适合的布站形状和基线长度可减小高度误差对定位精度的影响。

Wide area multilateration（WAM） is a new surveillance technique used in en-route and terminal area.Since receivers are all in the ground,length of baseline and height of target are very important to location accuracy.Target localization is calculated by hyperbolic algorithm and least square（LS） method.Then the relationship between location accuracy and height error is provided.Simulations of HDOP（Horizontal Dilution of Precision） and VDOP（Vertical Dilution of Precision） for the same height and different height show the influence of height on precession.Finally,layout of receivers is discussed.Suitable layout and baseline is useful for improving accuracy at the same height.