论文部分内容阅读
提出一种根据轨道根数与TDICCD成像原理模拟遥感器推扫成像过程,实现偏流角计算,并基于最终仿真图像的PSF分布评价图像质量的方法,以截止频率MTF为评价标准,研究太阳同步椭圆轨道的偏流角分布规律。结果表明:与常规圆轨道相比,近地点幅角为0°的椭圆轨道在近地点一侧偏流角与轨道半长轴成线性关系,与轨道离心率成三次函数关系。使用KH-12卫星采用的椭圆轨道参数进行成像仿真,以穿航MTF下降5%为约束对成像质量进行分析,结果表明:相同推扫级次下,椭圆轨道近地点一侧的偏流角更小,成像质量更高。
A method to simulate remote sensor push-broom imaging based on the number of orbits and TDICCD imaging is proposed to calculate the drift angle. Based on the PSF distribution of the final simulation image, the method of image quality evaluation is proposed. The cutoff frequency (MTF) Precipitation angle distribution of orbit. The results show that the elliptical orbit with the argument of 0 ° near the point has a linear relationship with the semi-major axis of orbit at the perigee and a cubic function with the eccentricity of the orbit. The imaging simulation using elliptical orbit parameters of KH-12 satellite was used to analyze the imaging quality under the constraint of a 5% reduction in MTF of astronautic flight. The results show that the drift angle on one side of elliptical orbit near the same position is smaller under the same level of flight, Image quality is higher.