为监测及修正紫外臭氧垂直探测仪(SBUS)在发射以及在轨运行过程中的光谱位置的偏移，采用了一种全新的高精度在轨光谱定标方法。利用高分辨率参考光谱与仪器狭缝函数进行卷积，并将卷积结果与修正后的测量光谱进行匹配，建立了相关评价函数，计算参考光谱和测量光谱误差最小时的光谱偏移量。对于SBUS，利用此方法定标得出的光谱偏移量为0.10 nm。利用SBUS星上汞灯光谱验证了定标结果的最大误差为0.01 nm，满足仪器指标要求。实验结果证明了高精度在轨光谱定标方法的可行性及精度。

A new high-accuracy spectral calibration is applied to monitor and correct spectral shift of solar backscattered ultraviolet spectroradiometer (SBUS) in launch and flight. A high-resolution reference spectrum is used to convolve with instrument′s slit function. The convolved results is matched with corrected spectrum measured by SBUS, and evaluation function is founded to calculate the value of the spectral shift that minimizes the difference between reference and measured spectrum. For SBUS, the optimal spectral shift is 0.10 nm. Finally, the result is validated by standard spectrum of on-board mercury lamp and the maximal error is 0.01 nm, which meets instrument′s requirements. The experimental results verity feasibility and precision of the high-accuracy spectral calibration.