资源一号02D卫星可见近红外相机在轨调试与图像质量评价方法

On-orbit Adjusting and Image Quality Assessment Method for VNIR Camera of ZY-1-02D Satellite

资源一号02D卫星发射入轨后,针对可见近红外(VNIR)相机工作状态与实验室标定状态的变化,开展了在轨调试及相应图像质量参数评价,保障了相机成像性能。基于资源一号02D卫星可见近红外相机高速推扫成像时场景不断变化的特点,研究了一种通过降低调焦算法对场景不变依赖性来提高调焦精度的调焦方法,保障了相机高精度快速调焦;针对资源一号02D卫星可见近红外相机同时具备高空间分辨率和大幅宽的特点,改进了相机成像参数调整方法,研究了一种基于在轨成像时全链路辐射传输模型的成像参数预估方法,确保了相机积分级数与增益处于最优状态。最后,在完成可见近红外相机在轨调试的基础上,对图像调制传递函数(MTF)、信噪比(SNR)等性能参数进行了测试,测试结果显示相机成像性能处于最优状态。

Considering the variation of the camera condition of ZY-1-02D between lab and on-orbit environments,a series adjustment and parameter-testing have been made for the VNIR camera,to keep the imaging performance of camera into a good status.Based on the property of imaging in pushing mode with high speed,the scenes acquired by camera are keeping varying.This paper proposes a refocusing method with low sensitivity to the varying scene to guarantee the efficiency and accuracy of camera refocusing.Secondly,the paper improved the adjusting method for imaging parameters.By utilizing the imaging chain with radiation transferring model,the status of VNIR camera has been well set.Finally,after finishing the adjusting of camera,MTF and SNR have been evaluated and the results indicated the imaging performance of VNIR camera is well optimized.