Method of preventing earth light for digital solar sensor

A sun sensor and earth albedo technology, which is applied in the field of sun sensors, can solve the problems such as the reduction of the use efficiency of digital sun sensors, and achieve the effects of preventing sudden changes in the position of the sun image, improving flexibility, and preventing interference

Inactive Publication Date: 2007-12-19
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

However, when the satellite has an abnormal attitude, it will be greatly affected by the earth's albedo, which will inevitably lead to a great reduction in the use efficiency of the digital sun sensor

Method used

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  • Method of preventing earth light for digital solar sensor
  • Method of preventing earth light for digital solar sensor
  • Method of preventing earth light for digital solar sensor

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Embodiment Construction

[0018] Provide a preferred embodiment of the present invention below in conjunction with Fig. 1, and describe in detail:

[0019] The detector used in this embodiment is STAR-1000 from FILLFACTORY Company, the pixel array is 1024×1024, and the pixel size is 15 μm×15 μm. The image acquisition and back-end processing algorithm can be completed by a field programmable gate array (FPGA), and the FPGA used is XQV300 of XINLINX company. It also includes two slices of EEPROM for data storage, using AT28HC256 of ATMEL Company.

[0020] The specific implementation process is shown in Figure 1, including the following steps:

[0021] S1. Narrow-band filtering: Before the sun's rays reach the detector, energy attenuation is required to ensure that the output of the sun sensor will not be saturated. The center frequency of the narrowband filter can be set to about 750nm, and the absorption of the atmosphere near this wavelength is much higher than other visible wavebands. The light-pas...

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Abstract

A method of using digital solar sensor to avoid earth light includes carrying out narrow band filtering on sunlight arrived on detector at optical unit, scanning complete frame of image cyclically to search pixel group with grey scale being greater than threshold, rejecting obvious false impression as per maximum grey scale if false impression of each light is searched also, making actual feedback with sun tracking module, sending sun angle and pixel number covered by image spot as well as maximum grey scale obtained by calculation to satellite attitude control master computer.

Description

Technical field: [0001] The present invention relates to the sun sensor in the attitude control system usually used as a satellite, specifically refers to several measures to prevent the earth albedo from causing measurement accuracy deterioration or even misjudgment when the digital sun sensor captures the sun, including the device and the back-end processing algorithm . Background technique: [0002] Until now, all solar sensors have been designed on the assumption that only one illuminant, that is, only the sun, appears in the sensor's field of view. Existing sun sensors cannot distinguish whether a single light source is at work, or several luminous objects are seen at the same time. Therefore, the earth albedo interference will reduce the accuracy of the sun sensor, which may lead to misjudgment when the satellite has an abnormal attitude. [0003] High-precision digital sun sensors are generally CCD or CMOS image sensors because the photosensitive detection elements ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C11/00B64G1/36
Inventor 朱鸿泰孙胜利仇善昌席红霞陈凡胜饶鹏
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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