为进一步提高多雷达系统的定位精度,分析了各雷达的测量精度随目标-雷达相对位置的实时变化情况。根据雷达的标称精度和雷达-目标的相对位置关系,推导了雷达测量精度的动态表达式,并对每个观测按精度进行最优加权,从而得到了最优权值计算公式。计算了固定权系数加权平均法和动态加权融合法所能达到的定位精度,分析了它们的定位精度几何稀释。蒙特卡罗仿真表明,与前者相比,后者的定位精度有很大提高。

In order to improve the accuracy of multi-radar localization system, the variation of measurement accuracy with the changing of radar-target relative position was studied. Based on the nominal accuracy of the radar in polar coordinates and the radar-target relative position, the dynamic expression of radar measurement accuracy was deduced out. Then the optimal weighting factors were educed. The accuracy of positioning achieved by weighted average method with fixed weighting factor and dynamic weighted fusion method was calculated out, and the Geometric Dilution of Precision (GDOP) was analyzed. Monte Carlo simulation results showed that the positioning accuracy of the latter was greatly improved.