双基地高频地波雷达三维曲面定位精度分析

Position accuracy for 3-D curved surface in bistatic high frequency surface wave radar

双基地高频地波雷达发射垂直极化电磁波沿海面绕射传播来探测海上和空中目标,导致地球曲率对探测精度的影响不可忽略。通过建立局部球面三维坐标系,在局部球面坐标系中求解不同测量子集下的目标高度解析式,并求解不同测量子集下的定位精度几何分布(geometric dilution of precision,GDOP)。仿真分析目标在不同飞行高度时各测量子集的GDOP分布特性,最后得到飞行目标定位的最优测量子集分布图。

Bistatic high frequency surface wave radar （HFSWR） transmits vertically polarized high frequen- cy wave propagating over coastal surface to detect nautical and aerial targets, the earth＇s curvature cannot be ig- nored. Target altitude formulations are established on a spherical coordinate system for different measurement subsets, the geometric dilution of precision （GDOP） is also conducted. Experiments demonstrate the GDOP of different subsets on variable flight altitude, the optimal distribution map of measurement subsets is also de- rived.