Small-sized two-axis sun sensor based on linear array APS image sensor

Abstract

The invention relates to a small-sized two-axis sun sensor based on a linear array APS image sensor. The small-sized two-axis sun sensor comprises a photoelectric element, an image acquisition and preprocessing unit and an image processing and error compensation unit, wherein the photoelectric element comprises a mask plate and the APS image sensor; the image acquisition and preprocessing unit comprises a video amplifier, an A / D converter and an FPGA; the image processing and error compensation unit comprises a singlechip microcomputer and an ROM; the mask plate has an'N'-shaped five-light-seam glass plate structure; two sun axis angles can be output by the linear array image sensor, and the linear array image sensor has a function of identifying sun bright spots; the FPGA is used for acquiring and preprocessing images; the singlechip microcomputer is used for carrying out image processing and error compensation; image data processing is completed when an image is acquired, so that the image storage space is greatly saved; the FPGA and the singlechip microcomputer work in parallel in a flow process, so that the product replacement rate reaches up to more than 30 Hz; furthermore, the sun sensor is high in accuracy, small in size, light in weight, high in replacement rate and convenient to connect, and has an integral structure.

Description

technical field [0001] The invention relates to a small biaxial sun sensor based on a linear array APS image sensor, and belongs to the technical field of optical attitude sensors of satellite control subsystems. Background technique [0002] The sun sensor is an optical attitude sensor that takes the sun as the reference position and measures the angle between the spacecraft attitude and the sun's light vector. According to the detectors used in the sun sensor, it can be divided into two types: battery chip type and imaging type. [0003] In the process of researching the imaging sun sensor, two solutions are proposed, one is the sun sensor based on the area array image sensor, and the other is the sun sensor based on the line array image sensor, the former is mostly APS CMOS image sensor , the latter are mostly linear array CCD image sensors. [0004] For the sun sensor based on the area array APS CMOS, due to the large area array image array, large-capacity data memory a...

AI Technical Summary

Problems solved by technology

[0004] For the sun sensor based on the area array APS CMOS, due to the large area array image array, large-capacity data memory and image processor (DSP or RISC) are required, resulting in large volume, high power consumption, and low update rate of the sun sensor, and relatively high cost

However, in the process of developing the solar sensor using the linear array CCD image sensor, due to the characteristics of the CCD image sensor, there are many types of power sources required, high power requirements and low integration, which increase the power consumption and weight of the solar sensor system. and volume, etc., it is difficult to realize the miniaturization and integration of solar sensors

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