基于双传感器的云底高度测量方法研究

Research on Cloud Base Height Measurement Method Based on Double Sensor

为保证航空摄影过程中能够有效观测地面,需保证飞机在云下飞行,目前云底高度观测主要方式为人工目测,根据经验值判断,估算误差较大,经常造成空飞或滞飞情况,既影响效率,又浪费飞行成本,本文中提出基于双传感器立体观测的云底高度测量方法,即通过定向观测点获得绝对定向角,之后通过云底高度观测设备获取外方位元素及有云像对,经过内业处理软件处理后计算云底高度,在烟台等地进行实地云底高度测量实验,并利用无人机进行精度检核,结果表明本系统方法可有效测定云底高度,符合航空摄影实施过程中实时了解云底高度要求。

In order to ensure that the ground can be effectively observed during aerial photography,it is necessary to ensure the aircraft’s under-the-cloud flight.At present,the main way to observe the height of the cloud is manual eyeballing and the estimation error is substantial.Hence it often causes invalidity or stagnant flight,which not only affects flight efficiency but also causes flight costs.A method for measuring the height of the cloud bottom based on three-dimensional observations with dual sensors is proposed in this paper.The absolute orientation angle is obtained via orientation observation point,and then exterior orientation elements and pair of pictures with cloud shadow are accessed through height observation device below the cloud.After that,the cloud bottom height is calculated through professional processing software.Experiments conducted in Yantai and other places and accuracy checked with drones show that the system can effectively measure the height of cloud bottom.