太阳影子定位建模与分析

Modeling and analysis of shadow positioning problem

太阳影子定位是根据物体影子随时间的变化,获取视频拍摄时间和地点的技术.针对太阳影子定位问题,基于直杆影长与杆高构成的直角三角形,建立了影长与时间的函数关系式;利用非线性最小二乘法估计关系式模型中的时间和地点等参数;根据某视频中获取的拍摄数据,采用Matlab技术对数据进行拟合分析,并利用太阳方位角,对拟合得到的影长函数进行回归分析,以完成角度校验.实验结果表明,非线性最小二乘法能够解决太阳影子定位问题,角度验证能够保证建模结果的合理正确性,且此方法简单高效.

Sun shadow location problem is a technology that aims to get the time and location of the video based on it. The function between shadow＇s length and time was established.The nonlinearleast square method was used to fit the curve, and the unknown parameters were estimated. According to the shooting data of a certain video, the model was simulated by Matlab technology, and the shadow＇s length function was tested by regression analysis with solar azimuth. The experimental resykts showed that the sun shadow location problem could be solved by the nonlinear least square method and angle verification could ensure the accuracy and rationality of the modeling results. Besides, this methodwas simple and efficient.