Satellite-borne horizontal staring and vertical scanning hyperspectral limb detection method

Abstract

The invention discloses a satellite-borne horizontal staring and vertical scanning hyperspectral limb detection method. The detection method comprises the following steps: step 1, determining a limb detection view field; step 2, setting working parameters of limb detection; step 3, determining a single limb scanning sequence based on the step 1 and the step 2; step 4, determining a whole rail limb scanning sequence based on the step 3; and step 5, completing in-orbit calibration of the limb scanning light path. According to the invention, staring is carried out in the horizontal direction, scanning is carried out in the vertical direction from the bottom of the atmosphere upwards in sequence by adopting the scanning mirror, the integral time, gain and acquisition times of the imaging spectrometer can be set according to the radiation intensity of a detected target at each limb scanning height, limb detection with a high signal-to-noise ratio is realized, and in-orbit calibration is carried out by adopting double transmission plates. And the on-orbit high-precision calibration is realized.

Description

technical field [0001] The invention belongs to the field of remote sensing detection of a spaceborne hyperspectral limb scanning imaging spectrometer, and in particular relates to a hyperspectral limb detection method of spaceborne horizontal staring and vertical scanning. Background technique [0002] Limb scanning of the Earth's atmosphere can obtain atmospheric composition profiles with high vertical spatial resolution. At present, typical foreign ultraviolet limb spectrometers include OSIRIS, SCIAMACHY and OMPS. Among them, OSIRIS scans the atmosphere based on a satellite platform. This method requires the entire satellite The platform cooperates with the observation, which limits the flexibility of the application (Jordi Cepa, MartaAguiar, Victor, et al.OSIRIS tunable imager and spectrograph.Proceedigns of SPIE Vol.4008(2000):623-631), SCIAMACHY uses a linear array detector, in the In side detection, scanning mirrors are needed for two-dimensional scanning (horizontal ...

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Problems solved by technology

[0002] Limb scanning of the Earth's atmosphere can obtain atmospheric composition profiles with high vertical spatial resolution. At present, typical foreign ultraviolet limb spectrometers include OSIRIS, SCIAMACHY and OMPS. Among them, OSIRIS scans the atmosphere based on a satellite platform. This method requires the entire satellite The platform cooperates with the observation, which limits the flexibility of the application (Jordi Cepa, MartaAguiar, Victor, et al.OSIRIS tunable imager and spectrograph.Proceedigns of SPIE Vol.4008(2000):623-631), SCIAMACHY uses a linear array detector, in the In side detection, scanning mirrors are needed for two-dimensional scanning (horizontal detection for azimuth scanning, vertical detection for pitch scanning) to complete the measurement of the earth's atmosphere. This method uses two scanning mirrors, and imaging spectrum observation has not been realized (Rolf Mager, Wolfgang, John P. Burrows, et al. SCIAMACHY A New-Generation of Hyperspectral Remote Sensing Instrument. Proceedigns of SPIE Vol.3106 (1997): 84-94.), OMPS has three independent vertical fields of view, each field of view is staring at the limb of the earth Observation, no scanning mirror is required, it cannot perform horizontal coverage detection (GlenJaross, Grace Chen, Mark Kowitt, et al.Suomi NPP OMPS Limb Profiler initialsensor performance assessment.Proceedigns of SPIE Vol.8528(2012):852805-1—852805- 9)

[0003] To sum up, the current limb detection method has not yet realized the observation method of horizontal staring and vertical scanning mirror scanning to achieve wide coverage in the horizontal direction and high spatial resolution in the vertical direction.

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