Title :
Nonuniformity correction of spot-detecting camera in satellite-to-ground laser communication ATP system
Author :
Qian Feng ; Jia Jian-Jun ; Wang Jian-Yu
Author_Institution :
Shanghai Inst. of Tech. Phys., Shanghai, China
Abstract :
Requirements of ATP ( Acquisition, Tracking, Pointing ) system for laser communication are expounded. According to the needs, the working of spot-detecting camera in ATP system is put forward, and the advantages of selecting CMOS sensor are explained. But the nonuniformity from CMOS sensor greatly limits the image quality of spot-detecting camera. So the nonuniformity must be corrected before image processing. In this paper, several sources of the nonuniformity and suppression methods are analyzed. The method of two-point nonuniformity correction is used to correct real-time image which is captured by STAR1000. The result of objective evaluation for the method shows that correction effect can satisfy the practical requirement. Positioning accuracy and signal-noise ratio of spot-detecting camera can be improved. At the same time energy demand of beacon used for laser communication is reduced.
Keywords :
CMOS image sensors; cameras; image processing; optical links; optical tracking; satellite communication; CMOS sensor; STAR1000; acquisition tracking pointing system; image processing; image quality; positioning accuracy; satellite-to-ground laser communication ATP system; signal-noise ratio; spot-detecting camera; two-point nonuniformity correction; Accuracy; CMOS integrated circuits; Cameras; Charge coupled devices; Electronic mail; Laser theory; Signal to noise ratio; ATP System; CMOS Sensor; Nonuniformity Correction; Optical Communication; Positioning Accuracy;
Conference_Titel :
Control Conference (CCC), 2013 32nd Chinese
Conference_Location :
Xi´an
