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On-orbit absolute radiation calibration method and system for satellite remote sensor

A technology of absolute radiometric calibration and satellite remote sensing, which is applied in the field of absolute radiometric calibration methods and systems for satellite remote sensors on-orbit, can solve the problems of increasing the difficulty of absolute radiometric calibration of remote sensors, and achieve high-precision quantification Inversion, improving the accuracy of absolute radiometric calibration, and the effect of large frequency

Active Publication Date: 2021-07-09
SHANGHAI SATELLITE ENG INST
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Problems solved by technology

However, there is a drift problem in the satellite orbit, and the energy entering the calibrator each time changes with the geometric angle of the satellite, which increases the difficulty of absolute radiometric calibration of the remote sensor

Method used

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  • On-orbit absolute radiation calibration method and system for satellite remote sensor
  • On-orbit absolute radiation calibration method and system for satellite remote sensor
  • On-orbit absolute radiation calibration method and system for satellite remote sensor

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Embodiment Construction

[0044] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0045] Such as Figure 1 to Figure 5 As shown, a method and system for on-orbit absolute radiation calibration of a satellite remote sensor based on a solar cone provided by the present invention comprises the following steps:

[0046] (1) The model is provided by the platform and the load unit, and a 3D satellite model consistent with the real state of the satellite product is established;

[0047] (2) Measure the BSDF properties of satellite surface materials. Calculate the surface characteristic pa...

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Abstract

The invention provides an on-orbit satellite absolute radiation calibration method and system for a satellite remote sensor. The method comprises the steps of: calculating the total radiation flux of sunlight entering a sunlight cone and then entering an on-satellite calibrator according to simulation software; adjusting a solar simulator in a laboratory by adopting a simulation device, so that light sources in an incident integrating sphere have the same total radiation flux; measuring the radiance of the light beam which is dodged by the integrating sphere and expanded by the beam expanding system, and converting the radiance into reflectivity; and substituting the reflectivity and the remote sensor radiation output count value DN into a radiation calibration formula, and calculating the absolute radiation calibration coefficient of the remote sensor on the on-orbit satellite. The invention provides a novel on-orbit satellite absolute radiometric calibration method, which takes sunlight entering a sunlight cone of an on-satellite calibration system and further entering an on-satellite calibrator as a radiometric calibration light source, and has the advantages of high calibration frequency and high calibration precision, and the influence of self radiation performance attenuation, atmospheric condition change and atmospheric radiation transmission model precision of the on-satellite calibration device is avoided.

Description

technical field [0001] The invention relates to the technical field of on-board calibration methods, in particular to an on-orbit absolute radiation calibration method and system for a satellite remote sensor. Background technique [0002] The calibration device mounted on the satellite remote sensor is an on-board calibration device based on a built-in calibration light. For details, see figure 2 . The calibration device consists of an integrating sphere, a built-in tungsten halogen lamp, a solar cone and a beam expander system. Due to the vibration during launch and the aging of related components, the radiation performance of the calibration light source (built-in tungsten halogen lamp) will decay with time, making it impossible to achieve on-orbit absolute radiation calibration of the remote sensor. Because there is no baffle in the sunlight cone, sunlight will enter the calibration device every time the remote sensor passes through the South Pole, which makes it possi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J1/02
CPCG01J1/02
Inventor 支丹丹顾亦磊汪少林赵其昌郭玲玲支俊俊舒瑞何军彭建涛金云飞
Owner SHANGHAI SATELLITE ENG INST
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