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为研究运动补偿下成像光谱仪的辐射能量采集特性,首先推导出系统探测器像元采集到的光谱辐射能量与瞬时视场光轴摆角的关系式。据此,在可见近红外(0.4～1.0μm)光谱范围内,计算不同摆角下系统采集到的光谱辐射能量与观测星下点(对应光轴摆角为0o)时系统采集到的光谱辐射能量的比值。结果表明:与观测星下点相比,运动补偿过程中系统采集到的总光谱辐射能量随光轴摆角的增大而减小,并且其中地面目标辐射所占的比例也随之减小。系统信噪比有类似的特性。要使整个观测过程辐射能量提高的倍率保持或接近预期的补偿倍率,光轴摆角尽量小于30o。
In order to study the radiation energy acquisition characteristics of the imaging spectrometer under motion compensation, the relation between the spectral radiant energy collected by the detector of the system detector and the angle of the optical axis of the instantaneous field of view is deduced first. Therefore, the spectral radiance collected by the system at different pendulum angles and the spectral radiance collected by the system at the observed satellite (corresponding to the optical axis swing angle of 0o) are calculated in the visible near-infrared (0.4-1.0μm) spectral range Energy ratio. The results show that the total spectral radiant energy collected by the system during the motion compensation decreases with the increase of the optical axis swing angle, and the proportion of ground target radiation decreases. System SNR has similar characteristics. To keep the magnification of the radiation energy of the whole observation process at or near the expected compensation magnification, the optical axis swing angle should be less than 30o.