Field Calibration for Static Array Infrared Earth Sensor

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 position 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 principal 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 flexible, and easy to test. The proposed method is put into the practice of the research of static array infrared earth sensor.