Digital sun sensor calibration method and device

Abstract

The invention discloses a calibration method for digital sun sensor, comprising following procedures. According to outer and inner parameters of sun sensor calibration system, unified mathematical model of sun sensor imaging is built. Two rotary shafts of rotary table are rotated to different angle so as to obtain data of calibration point and they are transmitted to processing computer by interface circuit. Processing computer sends said data of calibration point to the unified mathematical model and calibration parameters are calculated by two-step method. The invention also relates to the device applying the method. The device supplies illumination by sun simulator and data of different points can be obtained by rotating two-shaft rotary table. Processing computer is used to record data of calibration point and calculate corresponding calibration parameter. The method and the device are suitable for multiple digital sun sensors. The invention adopts unified building method of inner and outer parameters and improves calibration accuracy. At the same time because installing aligning accuracy is not required strictly the whole calibration process is simple.

Description

technical field [0001] The invention relates to solar sensor measurement technology, in particular to a digital solar sensor calibration method and device. Background technique [0002] The sun sensor is an attitude sensor that measures the angle between the sun's line of sight and a certain body axis or plane of the moving carrier. It is widely used in solar energy utilization and spacecraft attitude control. The new digital solar sensor mainly includes: an optical mask with a single hole or an array of small holes, a complementary metal oxide (CMOS, Complementary Metal Oxide Semiconductor) or a charge-coupled device (CCD, ChargeCoupled Device) image sensor and information processing circuit. Its working principle is: sunlight passes through the small holes of the optical mask and is transmitted to the image sensor to form a light spot. The incident angle of the sun's rays is different, and the position of the spot is different. The information processing circuit obtains...

AI Technical Summary

Problems solved by technology

There is a deviation in the installation of the sun sensor on the turntable, so that the coordinate system of the sun sensor cannot be consistent with the coordinate system of the turntable

Due to the influence of these external parameters such as installation alignment, there is an error in the calibration method that only establishes an imaging model for the internal parameters of the sun sensor, thus affecting the calibration accuracy of the internal parameters of the sun sensor

[0004] (2) The optical mask of the solar sensor usually etches small holes on the glass substrate. Due to the refraction effect of the glass substrate and the limitation of the processing technology, there is a certain nonlinear distortion in the small hole imaging model of the solar sensor, so the internal There is an error in the calibration method where the model parameters only include the focal length F and the coordinates of the origin

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