BRDF模型观测角测量模块的研制  

Development of Measuring Module for BRDF Viewing Angle

作　　者：侯莉颖[1] 陈继平[2] 余涛[2] 李旭东[1] 陈兴峰[2] 宁开放[1] 

机构地区：[1]北京航空航天大学,北京100083 [2]中国科学院遥感应用研究所遥感科学国家重点实验室,北京100101

出　　处：《测控技术》2012年第9期5-7,10,共4页Measurement & Control Technology

基　　金：国家自然科学基金资助项目(40971227);科技部国际科技合作计划资助项目(2010DFA21880);"欧盟第七框架计划"资助项目

摘　　要：BRDF(双向反射分布函数)模型是多角度遥感定量解译的理论基础,观测角是模型中的重要参数,其中包括观测天顶角和观测方向角。传统的测量观测角的方法是采用机械圆盘以及在地表画圆,但这种测量方法设备笨重、精度低、效率低,不适合水域的测量。提出了一种新的电子测量方法,利用加速度计测量重力加速度的三维分量,利用磁阻传感器测量地磁场的三维分量,通过坐标投影原理得到BRDF模型中的观测角。这种测量方法设备便携、成本低、效率高。观测天顶角的测量范围为-90°～90°,观测方位角的测量范围为0°～360°,在测量范围内的测量精度为±1°,满足BRDF观测角的测量要求。The BRDF is the theoretical basic of multi-angle remote sensing quantitative interpretation. And the viewing angle is the important parameter, including viewing zenith and direction angle. Using a mechanical disk and draw a circle in the surface is the traditional measuring method. However, this method has the disadvanta- ges of heavy equipment, lower accuracy and efficiency, and it isn＇t fit for measuring waters. Consequently, a new method based on electronic technology is developed. The accelerometer is used with the purpose of meas- uring gravitational acceleration vector, and the magnetoresistive sensor is used to sense the geomagnetic field. Then the viewing angle of BRDF can be got by coordinate projection theory. It has the advantage of low cost and consumption, meanwhile it＇ s easy to operate. The viewing zenith angle is in the range of -90°- 90° and the viewing direction angle is in the range of 0°- 360°, accuracy is up to 1 °. It meets the measurement require- ments for BRDF viewing angle.

关 键 词：BRDF 加速度计 磁阻传感器 误差补偿 

分 类 号：TM932[电气工程—电力电子与电力传动]