面阵静态红外地球敏感器现场标定

Field Calibration for Static Array Infrared Earth Sensor

针对面阵静态红外地球敏感器的现场标定,提出基于规则小孔平面靶标的现场标定方法.将小孔平面靶标固定放置于面源黑体前方,在光学视场测量空间内,多次调整红外地球敏感器的摆放位置,以采集多幅不同位置、不同角度的红外靶标光点图像.使用等高层最小二乘椭圆拟合方法精确提取靶标红外光点的中心坐标,获得特征点信息.利用红外靶标图像和图像特征点计算面阵静态红外地球敏感器光学系统的焦距和主点坐标.试验结果表明,该标定方法简单灵活有效,便于调试现场操作.目前,该方法已在面阵静态红外地球敏感器研究中得到应用.

Based on planar target with regular holes, a field calibration method for static array infrared earth sensor is proposed. The planar target is placed in front of the surface blackbody, and the target plane is parallel to the surface of the blackbody. In the vision field of static array infrared earth sensor, the infrared earth sensor is placed for several pose. Infrared light spot images of target with different posi- tion and attitude are obtained. The infrared spot center location is extracted accurately via a contour least square ellipse fitting algorithm. Feature point coordinate is acquired. Finally, the focal length and princi- pal point coordinate of the static array infrared earth sensor is calculated by using infrared target images and image feature points. Experiment results verify that the proposed method operation is simple and flex- ible, and easy to test. The proposed method is put into the practice of the research of static array infrared earth sensor.