红外与激光工程
紅外與激光工程
홍외여격광공정
INFRARED AND LASER ENGINEERING
2014年
9期
3162-3167
,共6页
星敏感器%动态环境%退化长度%退化方向%运动轨迹
星敏感器%動態環境%退化長度%退化方嚮%運動軌跡
성민감기%동태배경%퇴화장도%퇴화방향%운동궤적
star sensor%dynamic condition%blur length%blur direction%motion trajectory
当运动角速度超过允许的最大角速度时，星敏感器工作在动态环境下，星点的灰度特征将不再呈高斯分布，这将影响质心计算的精度。给出了在角速度的影响下星点质心运动轨迹的解析解，并结合曝光时间短的特点，对轨迹的参数方程进行简化并通过仿真分析验证了其精确性。分析了退化星点灰度分布特征，并结合星点质心运动轨迹方程提出基于质心运动轨迹对星图的退化参数进行估计的方法。通过仿真实验，完成了对退化长度及退化方向的估计，对退化长度的估计误差不超过0.8个像素，对退化方向的估计误差不超过2°，并证实了该方法能有效提高质心计算精度。
噹運動角速度超過允許的最大角速度時，星敏感器工作在動態環境下，星點的灰度特徵將不再呈高斯分佈，這將影響質心計算的精度。給齣瞭在角速度的影響下星點質心運動軌跡的解析解，併結閤曝光時間短的特點，對軌跡的參數方程進行簡化併通過倣真分析驗證瞭其精確性。分析瞭退化星點灰度分佈特徵，併結閤星點質心運動軌跡方程提齣基于質心運動軌跡對星圖的退化參數進行估計的方法。通過倣真實驗，完成瞭對退化長度及退化方嚮的估計，對退化長度的估計誤差不超過0.8箇像素，對退化方嚮的估計誤差不超過2°，併證實瞭該方法能有效提高質心計算精度。
당운동각속도초과윤허적최대각속도시，성민감기공작재동태배경하，성점적회도특정장불재정고사분포，저장영향질심계산적정도。급출료재각속도적영향하성점질심운동궤적적해석해，병결합폭광시간단적특점，대궤적적삼수방정진행간화병통과방진분석험증료기정학성。분석료퇴화성점회도분포특정，병결합성점질심운동궤적방정제출기우질심운동궤적대성도적퇴화삼수진행고계적방법。통과방진실험，완성료대퇴화장도급퇴화방향적고계，대퇴화장도적고계오차불초과0.8개상소，대퇴화방향적고계오차불초과2°，병증실료해방법능유효제고질심계산정도。
Star′s gray intensity wouldn′t follow 2-D Gaussian distribution when the rotational velocity exceeded the highest rotational velocity which would affect the processing precision of centroid of star spot. The analytical solution of motion trajectory of star′s centroid was simplified considering that the exposure time was short enough, and then the precision of the linear approximation was analyzed through simulation. The character of gray intensity of smearing star was analyzed based on the simplified trajectory, then a novel algorithm was proposed to estimate the degradation parameters of smearing star image. Through simulation and experiment, the validity of the proposed algorithm has been testified, the largest error of estimated blur length is around 0.8 of a pixel, while error of the estimated blur direction is about 2°, feasibility of the proposed method has also been validated through simulations.
