星载微波辐射计外定标的关键问题是通过辐射传输方程计算天线入瞳处亮温。

The key issue in external calibration of microwave radiometer on board satellite is the determination of brightness temperature on the pupil of antenna by using radiative transfer equation.

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系统孔径，常指入瞳 （entrance pupil）或孔径光 （aperture stop），它限制可从已定义视场入射光学系统的光线。

The system aperture, often the entrance pupil or the aperture stop, limits the rays that can enter the optical system from the defined field.

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瞳仁认证虽然不错，但滴入扩瞳药水就可以轻易地改变瞳仁大小。所以说没有什么技术是绝对可靠的。

"Irises are very good for recognition but you can put in dilation drops which change the iris completely. No technique is infallible, " he said.

youdao

瞳仁认证虽然不错，但滴入扩瞳药水就可以轻易地改变瞳仁大小。所以说没有什么技术是绝对可靠的。

"Irises are very good for recognition but you can put in dilation drops which change the iris completely. No technique is infallible, " he said.

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