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Line frequency calculation method for TDI camera vertical orbit rotating whiskbroom imaging

A calculation method and vertical rail technology, which is applied in the line frequency calculation field of TDI camera vertical track rotation and sweep imaging, can solve problems such as the difficulty of line frequency calculation, and achieve the effect of expanding the calculation method, expanding the application field, and expanding the scope

Active Publication Date: 2018-02-16
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] In order to solve the difficult problem of difficult calculation of line frequency caused by dynamic changes of multiple velocity vectors during satellite rapid rotation and ultra-large width push-broom imaging, the present invention provides a line frequency calculation method for TDI camera vertical orbit rotation swing-sweep imaging

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  • Line frequency calculation method for TDI camera vertical orbit rotating whiskbroom imaging
  • Line frequency calculation method for TDI camera vertical orbit rotating whiskbroom imaging
  • Line frequency calculation method for TDI camera vertical orbit rotating whiskbroom imaging

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specific Embodiment approach 1

[0033] Specific implementation mode 1. Combination Figure 1 to Figure 4 Description of this embodiment, the line frequency calculation method of the TDI camera vertical orbit rotation swing imaging line frequency is determined by the combined speed of the target scene on the image plane and the size of the CCD pixel. , there are three velocity vectors: the earth's rotation velocity, the satellite's precession velocity and the satellite's rotational angular velocity. Because the three velocity vectors are not on the same plane;

[0034] Firstly, each velocity vector should be calculated separately and projected onto the object surface for synthesis.

[0035] V 地 = ω 地 × R 地 ;

[0036]

[0037] V 卫旋 = ω 卫 × L 侧 ;

[0038]

[0039] Among them, ω 地 =7.2921×10 -5 rad / s; R 地 =6371.004km; ω 卫 =10° / s; μ=3.986×10 14 ;H 0 =h+R 地 ;φ is the angular position corresponding to the rotation;

[0040] V 地速投影 =V 地 ×cosφ

[0041] Then the satellite speed and the camera...

specific Embodiment approach 2

[0053] Specific Embodiment 2. This embodiment is an embodiment of the method for calculating the line frequency of a TDI camera vertical orbit rotation and sweep imaging described in Embodiment 1: calculate the detector according to the orbital height, geographic latitude and sweep angle position The vertical rail swings to sweep the line frequency.

[0054] (1) Assuming that the satellite orbit height is h=500km, the earth’s radius R=6371km, and the latitude is 0°, when the vertical orbit swing imaging reaches a side swing of 45°, there are three velocity vectors as follows: Figure 4 As shown, they are:

[0055] Earth's rotation speed V 地 = ω 地 × R 地 =464.58m / s

[0056]satellite precession speed

[0057] Satellite rotation sweep speed V 旋 = ω 卫 × L 侧 =123385.68m / s

[0058] (2) Calculation of combined velocity vector on object surface

[0059] i 0 =97.4°

[0060] α=atan(V 旋 / V 卫星 )+i 0

[0061]

[0062] (3) Calculation of the uplink frequency on the image...

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Abstract

Relating to the technical field of photoelectronic imaging, in order to solve the problem that the dynamic change of a plurality of velocity vectors causes line frequency calculation difficulty in satellite rapid rotation super large width push-broom imaging, the invention provides a line frequency calculation method for TDI camera vertical orbit rotating whiskbroom imaging. Directed at the defectthat the traditional remote sensing satellite static push-broom imaging line frequency calculation cannot adapt to the rapid and real-time change demand of satellite rotating whiskbroom dynamic imaging line frequency, the method respectively calculates the earth rotation velocity, satellite precession velocity and satellite rotation velocity in the vertical orbit rotating whiskbroom imaging process mainly according to the orbit height, scenery latitude and rotation angle position, the three velocity vectors are projected to an object plane for synthesis, the resultant velocity vector on an image plane is calculated, and the ratio of pixel size to the image plane resultant velocity vector is utilized to calculate dynamic whiskbroom imaging real-time line frequency, thus achieving the purpose of vertical orbit whiskbroom dynamic imaging line frequency real-time registration. The method provided by the invention is simple, reliable and feasible, and extends the application field of dynamic whiskbroom satellites.

Description

technical field [0001] The invention relates to the technical field of photoelectric imaging, in particular to a method for calculating line frequency of TDI camera vertical orbit rotary swing scanning imaging. Background technique [0002] At present, in order to achieve push-broom imaging in a wider range, optical remote sensing satellites have developed from the orbital sub-satellite point or large side-swing push-broom imaging mode to the vertical-orbit rotary swing-broom imaging mode. CCD splicing or simultaneously increasing the camera’s side swing capability to achieve push-broom imaging in a certain field of view in a large area, which cannot achieve ultra-large and wide-range imaging, and vertical orbit rotation swing imaging uses the satellite’s rapid rotation to make it parallel to the satellite’s flight direction The linear array CCD detector rotates continuously at 360° to realize fast push-broom imaging in the vertical orbit direction, thereby maximizing the sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C11/02
CPCG01C11/025
Inventor 杨秀彬王家骐金光王旻常琳
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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