Image extraction method in linear array APS sun sensor

Abstract

The invention relates to a light spot image extraction method in a linear array APS (Auxiliary Propulsion System) sun sensor. Aiming at the characteristics of the linear array APS sun sensor and considering the interference of parasitic light, the influence of temperature to a device, secondary reflection of light in a cavity and other adverse effects, the method adopts dynamic gray thresholds, only grey scale values larger than the threshold part in a whole frame image are taken as extracted light spot data; meanwhile, effective images are provided to determine the thresholds which are taken as the criterion for distinguishing true and false light spots, and formed light spot images are screened; the light spot images are identified after being extracted, and unwanted images are picked by determining the positions of three straight slits and the sum of image grey scale values. According to the method, under the condition of high temperature, light spot images can be extracted quickly and effectively when the back noise of an image sensor is increased greatly; when secondary reflection exists on the surfaces of light slit glass and the sensor, even if false images appear in the images, true light spot data can still be identified, so that two-axis angle calculation in the later period can be accomplished conveniently.

Description

technical field [0001] The invention relates to an image extraction and recognition method in a linear array APS sun sensor, and belongs to the technical field of satellite control subsystem optical attitude sensors. Background technique [0002] The sun sensor based on the APS image sensor usually uses a light introducer with a light slit or a light hole to project the light onto the APS image sensor, and calculates the incident angle of the light according to the displacement of the image centroid from the origin. The sun sensor based on the APS image sensor Most of the sensors are area array APS solar sensors to measure the two-axis attitude angle. The linear array APS image sensor is usually only capable of single-axis angle measurement, and there is no single-line array APS image sensor for two-axis angle measurement. According to reports, there are few researches on image extraction and recognition based on linear array APS image sensor. The commonly used "N" type ligh...

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Problems solved by technology

[0002] The sun sensor based on the APS image sensor usually uses a light introducer with a light slit or a light hole to project the light onto the APS image sensor, and calculates the incident angle of the light according to the displacement of the image centroid from the origin. The sun sensor based on the APS image sensor Most of the sensors are area array APS solar sensors to measure the two-axis attitude angle. The linear array APS image sensor is usually only capable of single-axis angle measurement, and there is no single-line array APS image sensor for two-axis angle measurement. According to reports, there are few researches on image extraction and recognition based on linear array APS image sensor. The commonly used "N" type light slits are at large angles. Due to the angle relationship, only two light slits are left in the three light slit images, and it is difficult to distinguish them at this time. Which one is the central straight slit and which one is the inclined slit makes it difficult to identify the spot

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