噪声预测点到飞行轨迹的最短距离测算

Measurement and Calculation of the Minimum Distance between Noise Prediction Point and Flight Path

应用三角摄影测量的基本原理探讨了采用多台摄像机对飞机进行三维交会定位的思想。根据成像系统的共线方程推导了飞机定位的数学模型及其最小二乘解。综合考虑飞机的飞行特点,制定了与之相应的分区域接力测量系统;并应用该系统成功得到了飞机起飞着陆阶段的飞行轨迹。基于采样数据时间上的延续性和规律性,提出了一种变时间步长的搜索逼近算法,优化了预测点到飞行轨迹的最短距离计算过程。实验表明,基于摄像测量的飞机定位与轨迹测量方法可行、结果稳定,可与机载GPS相互补充。基于变时间步长的搜索逼近算法可大大减小计算工作量,提高效率。

On the base of triangle photogrammetry, using vidicons is studied on to locate aircrafts by three dimentional intersection, ratiocinated the mathematical model of aircraft location and its least square solution. Consid- ering the aircrafts＇ fight characteristics, a subarea relay measurement system was gived and successfully used to measure the fight path of aircrafts during the taking off and landing period. In order to optimize the calculation of the minimum distance betweeen prediction point and flight path, a search and approach method based on changea- ble time step was gived according to the time continuity of data. The experiments indicate that the aircraft location and flight path measurment based on videogrammetry is feasible and stabilized which can be used as complementarity of airborne GPS, the search and approach method based on changeable time step can greatly reduce the workload and improve efficiency.