A method and device for on-orbit spectral calibration based on ground laser targets

Abstract

The invention discloses an on-track spectrum calibration method and device based on a ground laser target. The method comprises the following steps that a spectrograph carried by a satellite receives laser light emitted by at least two laser devices, outputs response data and sends the response data to a processor, wherein the response data comprise light spot positions of all spectrum channels; the processor contrasts the response data with laboratory spectrum calibration data, and obtains on-track spectrum calibration data. On the basis of the light beams emitted by the ground laser devices, spatial positions of different wave lengths on a detector are determined; by the contrast with the laboratory calibration data, on-track calibration accuracy is improved by figuring out a plurality of spectral line drift distances.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to an on-orbit spectral calibration method and device based on a ground laser target. Background technique [0002] The imaging spectrometer can simultaneously acquire the two-dimensional spatial image and one-dimensional spectral information of the target. It can not only directly reflect the geometric shape of the measured target, but also provide the physical and chemical properties of the target. It is a detection method that combines graphs and spectra. Since the 1980s, spectral imaging technology has been widely used in aerospace remote sensing imaging, carried by aircraft, and has made remarkable achievements in the fields of mineral and oil resource detection, water quality and air pollution monitoring, precision agriculture and forestry. At present, this technology has gradually penetrated into civilian fields such as biomedicine, artwork anti-counterfeiting identification...

AI Technical Summary

Problems solved by technology

Internal calibration needs to carry a large number of calibration instruments, which increases the weight of the satellite. It takes a long period to scan all channels. In the space environment, it cannot be guaranteed that the calibration instrument itself will not change, and it is necessary to rotate the light source through the rotation of other components. Entering the field of view of the camera, the rotating device will be stuck in this way, causing the danger that the camera cannot image the earth, and the system hardware and software will be very complicated; when atmospheric absorption lines are used for post-emission spectral calibration, only individual Several channels are calibrated, and it is difficult to guarantee the calibration accuracy of all channels for imaging spectrometers with nonlinear dispersion

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