Satellite-borne multi-beam laser range finder in-orbit non-field orientation calibration method

A laser rangefinder and laser pointing technology, applied in radio wave measurement systems, instruments and other directions, can solve problems such as difficulty in target laying, and achieve the effect of solving the difficulty of target laying

Pending Publication Date: 2022-05-13
CHINA ACADEMY OF SPACE TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical solution of the present invention is to overcome the deficiencies of the prior art, and provide a method for on-orbit field-free pointing calibration of a spaceborne multi-beam laser rangefinder, which aims to solve the problem of difficulty in laying targets at the initial stage of satellite orbiting, and is a kind of A calibration method that does not depend on the calibration field can be applied to the geometric positioning of spaceborne laser range finders

Method used

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  • Satellite-borne multi-beam laser range finder in-orbit non-field orientation calibration method
  • Satellite-borne multi-beam laser range finder in-orbit non-field orientation calibration method
  • Satellite-borne multi-beam laser range finder in-orbit non-field orientation calibration method

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Embodiment 1

[0069] In this embodiment, a space-borne multi-beam laser rangefinder on-orbit field-free pointing calibration method is disclosed. A flat area is selected, and different attitude maneuvers are performed through satellites, and the obtained satellite attitude orbit information and different maneuvering conditions are used. The laser ranging value below is processed to obtain the laser pointing error.

[0070] Such as figure 1 , the on-orbit field-free pointing calibration method of the spaceborne multi-beam laser rangefinder, including:

[0071] Step 1, select the calibration area. The selected calibration areas are flat terrain areas, including but not limited to: oceans, lakes, plains and grasslands.

[0072] Step 2, obtain the theoretical pointing angle of the multi-beam laser rangefinder. Among them, the theoretical pointing angle of the multi-beam laser range finder can be determined through the installation matrix of the multi-beam laser range finder.

[0073] Step 3...

Embodiment 2

[0081] In this embodiment, the on-orbit field-free pointing calibration method of the spaceborne multi-beam laser rangefinder includes:

[0082] Step 1, select the calibration area.

[0083] In this embodiment, the Caspian Sea is selected as the area used for calibration. By querying the weather information, the weather in the Caspian Sea is clear without cloud cover, and the sea surface is less windy and the wave height is less than 1m.

[0084] Step 2, obtain the theoretical pointing angle of the multi-beam laser range finder.

[0085] In this embodiment, the specific implementation of step 2 is as follows: constructing a Cartesian coordinate system. Among them, the origin O of the Cartesian coordinate system is defined as the center of mass of the satellite; the OZ axis is located in the orbital plane, pointing to the center of the earth; the OX axis is located in the orbital plane, perpendicular to the OZ axis, and points to the satellite velocity direction.

[0086] Suc...

Embodiment 3

[0136] In this embodiment, the on-orbit field-free pointing calibration method of the spaceborne multi-beam laser rangefinder includes:

[0137] Step 1, select the calibration area.

[0138] In this embodiment, the Caspian Sea is selected as the area used for calibration. By querying the weather information, the weather in the Caspian Sea is clear without cloud cover, and the sea surface is less windy and the wave height is less than 1m.

[0139] Step 2, obtain the theoretical pointing angle of the multi-beam laser range finder.

[0140] In this embodiment, the specific implementation of step 2 is as follows:

[0141] Construct a Cartesian coordinate system. Among them, the origin O of the Cartesian coordinate system is defined as the center of mass of the satellite; the OZ axis is located in the orbital plane, pointing to the center of the earth; the OX axis is located in the orbital plane, perpendicular to the OZ axis, and points to the satellite velocity direction.

[01...

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Abstract

The invention discloses a satellite-borne multi-beam laser range finder in-orbit non-field orientation calibration method. The method comprises the following steps: selecting a calibration area; obtaining a theoretical directional angle of the multi-beam laser range finder; acquiring satellite attitude information, satellite orbit information, the height from a satellite to a sub-satellite point and the actually measured distance from the satellite to a calibration area in an on-orbit stage and in a normal flight attitude; constructing a laser pointing error resolving equation in an on-orbit stage and in a normal flight attitude; controlling the satellite to carry out attitude maneuver, and constructing a laser pointing error resolving equation after attitude maneuver; and calibrating the pointing deviation of the multi-beam laser range finder according to the constructed laser pointing error resolving equation in the on-orbit stage and the normal flight attitude and the constructed laser pointing error resolving equation after attitude maneuver. The invention discloses a calibration method independent of a calibration field, solves the problem of difficulty in target laying at the initial stage of satellite injection, and can be applied to geometric positioning of a satellite-borne laser range finder.

Description

technical field [0001] The invention belongs to the technical field of on-orbit calibration of a space-borne laser range finder, and in particular relates to a method for on-orbit field-free pointing calibration of a space-borne multi-beam laser range finder. Background technique [0002] Due to the vibration, satellite orbit, attitude, time scale and ranging and pointing errors of the laser rangefinder ground calibration during the satellite launch process, the spaceborne laser rangefinder will reduce the accuracy of the laser measurement results as altitude control. Therefore, it is necessary to The parameters of the laser range finder that affect the accuracy are calibrated on-orbit. [0003] At present, the calibration methods used for space-borne laser range finders at home and abroad mainly include ground-based detector method, airborne infrared imaging method, terrain-based calibration method, and satellite attitude maneuver method. Each method has its own advantages...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/497
CPCG01S7/497
Inventor 胡震岳景泉王倩莹陈曦王家炜李少辉
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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