摘要
通过在飞行器表面安装x型的激光发射装置作为合作目标,用于飞行器近景姿态测量。该方法将飞行器姿态变化进行了有效放大,提高了测量精度。建立相应的数学模型以确定飞行器的外部姿态。针对系统的测量函数关系式具有隐式、非线性的特点,且相关系数估计困难,提出了基于蒙特卡罗统计仿真的不确定度估计方法。通过静态实验测得各输入坐标的不确定度及其误差服从的概率分布。用计算机模拟抽样各分量代入测量数学模型中,得到三维姿态的估计值和系统的总不确定度。从而有效地回避了由于测量方程的限制而对测量不确定度估计所造成的困难。使不确定度评定更为有效。仿真结果为实际测量的精度估算奠定基础。
To measure the attitude of an aircraft in close-range,an x-shape cooperation target that consists of four lasers is installed on the aircraft,which projects the lasers to the two parallel screens.The change of the aircraft position is magnified and the measuring accuracy of the system is improved.Aiming at the implicit and nonlinear characteristics of the measurement model and the difficulty in correlation coefficient estimation,an uncertainty estimation method based on Monte-Carlo stimulation is proposed.The uncertainty of input coordinates and the probability distribution of the errors are obtained through static experiments.Each component obtained from computer simulation sampling is put into the measurement model.The estimated value of 3D attitude and the total uncertainty of the system are obtained.The difficulties in estimating uncertainty are avoided effectively.The estimation results lay the foundation for the evaluation of the practical measurement accuracy.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2010年第8期1873-1877,共5页
Chinese Journal of Scientific Instrument
关键词
合作目标
姿态测量
精度估计
蒙特卡罗仿真
cooperation target
attitude measurement
accuracy estimation
Monte-Carlo stimulation
