Moiré-based dual-axis digital solar sensor

Abstract

The invention discloses a moire-fringe-based biaxial digital sun sensor and belongs to the field of attitude sensors. The moire-fringe-based biaxial digital sun sensor comprises a shell, a signal processing unit, an image sensor, two interface units and two grid gratings, wherein the signal processing unit is arranged in the shell and is used for calculating a solar azimuth; the image sensor is used for transmitting a moire fringe image; the image sensor is electrically connected with the signal processing unit; the two interface units are fixed outside the shell and are respectively and electrically connected with the signal processing unit; one interface unit is used for transmitting the solar azimuth, and the other interface unit is used for supplying power to the signal processing unit; the two grid gratings are arranged in the shell, are parallel to each other and have the equal pitch; an annular gasket is arranged between the two grid gratings; the edge at which the annular gasket is in contact with the two grid gratings is fixed through a screw; the grating surface of one grid grating in the two grid gratings is clung to the working face of the image sensor; the edge at which the grating surface is in contact with the working face is dispensed and then is fixed through a screw. The biaxial digital sun sensor is high in interference resistance and high in measurement precision, and high precision and large view field are simultaneously realized.

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 two-axis digital sun sensor based on Moiré fringes. 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 coordinate plane of a spacecraft such as a satellite, with the sun as the reference position. There are mainly three types: analog, appearance and digital. In recent years, as space missions have higher and higher requirements for the accuracy and reliability of the attitude measurement of the spacecraft relative to the sun, the digital sun sensor has been widely used for its advantages of large field of view, high precision, service life and reliability. application. Digital sun sensors can be divided into single-axis and dual-axis digital sun sensors, among which the dual-axis digital sun sensor o...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that high precision and large field of view cannot be realized simultaneously and the measurement accuracy is relatively low in the existing dual-axis digital sun sensor that uses an area array CMOSAPS image sensor plus a small hole to measure the sun azimuth angle, the present invention provides a Moiré-based dual-axis digital sun sensor with high precision, large field of view and strong anti-interference ability

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