摘要
对星敏感器的实际测量模型和模型参数的校准方法进行了深入研究。首先,在星敏感器理想测量模型的基础上,充分考虑焦距偏差、光学系统的成像畸变、图像传感器感光面的倾斜、图像传感器感光面的旋转和主点偏差等因素对导航星实际成像位置的影响,用几何的方法建立了星敏感器的实际测量模型,其次,分析了各因素对星敏感器测角精度的影响规律;通过实测校准数据,借助最小二乘法求解模型参数,完成了星敏感器的校准。实验结果表明,测角精度得到了提高。
An actual measurement model of star sensor is established by geometrical method.The effect of relative factors to the actual imaging location of navigation star is considered into the ideal measurement model of star sensor.These factors include focal length deviation,optical lens distortion,image sensor tilt,image sensor rotate,primary point bias,etc.The affecting law of the factors on angle-measuring accuracy of star sensor is analyzed.The star sensor is calibrated through the measured calibration data and the model parameters solved by least square method.The experimental results show that the angle measurement accuracy of x and y directions is 1.6″ and 2.3″ after calibration,but 19.6″ and 17.8″ before calibration.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2010年第6期880-885,共6页
Journal of University of Electronic Science and Technology of China
关键词
校准
最小二乘
模型
星敏感器
calibration
least-squares
model
star sensor
