High precision APS sun sensor

A solar sensor, high-precision technology, applied in the direction of instruments, aircraft, space navigation aircraft, etc., can solve the problems of large data, slow speed, heavy optical probe, etc., to meet the requirements of large field of view, fast data update, light weight Effect

Inactive Publication Date: 2007-02-07
BEIHANG UNIV
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Problems solved by technology

The analog sun sensor with photocell as photosensitive detection element is based on photovoltaic characteristics, analog output, resolution and measurement accuracy are low, and cannot meet the requirements of large field of view and high precision for spacecraft attitude control. General digital sun sensors, For example, the coded sun sensor has higher precision than the analog sun sensor, but its optical probe is heavier and the control is complicated, which does not meet the requirements of miniaturization and light weight, and also limits the improvement of measurement accuracy. NASA's jet propulsion Laboratory (JPL) has always been in the leading position in the world in the research of low-power, high-precision solar sensors. In 2003, it developed a solar sensor based on a porous optical mask. The porous design improves the accuracy of the solar sensor, but its The calculation of the center of mass of the sun sensor light spot is realized by transmitting the image to the RISC processor. This process needs to transmit a lot of data and the speed is slow, which becomes the bottleneck of the speed of the sun sensor and increases the complexity of the algorithm. In addition, The calculation of its attitude is also realized by RISC processor

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Embodiment Construction

[0030] As shown in Figure 1 (a), the high-precision APS solar sensor of the present invention images the sun based on the principle of pinhole imaging, making its imaging spot projected on the CMOS APS image sensor, and can measure and calculate the sun's position according to the central position of each spot. Incidence angle, here establishes a coordinate system as shown in Figure 1(b) for one of the small holes, assuming that the vector direction of sunlight in the small hole coordinate system is V, and the incident angles on the two axes are α, β, and small The distance between the hole plane and the imaging plane is F, thus the coordinates of the center of mass of the image point in this coordinate system (X c , Y c ) and the incident angle α, β are expressed as follows:

[0031] X C Y C ...

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Abstract

The invention relates to a high-accuracy APS sun sensor, which comprises: a light lead unit, a picture sensor, a signal processing unit and an interface unit, wherein said light lead unit is connected to the picture sensor; the signal processing unit is connected to the picture sensor and the interface unit; said interface unit is connected to the main computer; the light lead unit is used to generate the speckle array picture; the picture sensor is used to output the pixel gray valve of speckle array picture; the signal processing unit, based on said gray valve, tests the state angle; the interface unit is used to transmit the state angle to the main computer. The invention has high speed, small volume, large view angle, high accuracy and low power consumption.

Description

technical field [0001] The invention belongs to the technical field of an attitude sensor in an attitude measurement control system on a spacecraft, and in particular relates to a high-precision APS sun sensor. Background technique [0002] The sun sensor is an attitude sensor that uses the sun as the reference position to measure the angle between the sun's line of sight and a certain body axis or coordinate plane of a spacecraft such as a satellite. There are mainly three types: analog, general digital and new digital. Among them, the analog type and the general digital type are commonly used by domestic and foreign spacecraft, and the photosensitive detection elements used are mostly semiconductor photocells (Si) and photoconductive devices (CdS). The analog sun sensor with photocell as photosensitive detection element is based on photovoltaic characteristics, analog output, resolution and measurement accuracy are low, and cannot meet the requirements of large field of vi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64G1/66G01C17/34
CPCB64G1/363
Inventor 张广军江洁樊巧云
Owner BEIHANG UNIV
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