Single-axis digital sun sensor based on Moiré fringes

Abstract

The invention provides a moire fringe-based uniaxial digital type sun sensor belonging to the field of posture sensors. The sun sensor comprises a shell, a signal processing unit, an image sensor, two interface units and two gratings, wherein the signal processing unit is arranged inside the shell and used for calculating the solar azimuth, the image sensor is used for transmitting a moire fringe image and electrically connected with the signal processing unit; the two interface units are both fixed outside the shell and respectively electrically connected with the signal processing unit, one interface unit is used for transmitting the sun azimuth, and the other interface unit is used for supplying electricity to the signal processing unit; the two gratings are arranged inside the shell, are parallel to each other and in the same pitch; an annular gasket is arranged between the two gratings, and the edge of the annular gasket, in contact with the two gratings, is fixed by a screw; and the grating surface of one grating is attached to the working surface of the image sensor, and the contact edge of the grating surface and the working surface of the image sensor is dispensed and fixed by screws. The sun sensor is strong in interference resistance, high in accuracy large visual field, and high in measurement accuracy.

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 single-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 single-axis digital sun sensors...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the existing single-axis digital sun sensor that uses a line array CCD plus a slit to measure the sun’s azimuth angle cannot realize high precision and large field of view at the same time, and the measurement precision is relatively low, the present invention provides a high-precision Single-axis digital sun sensor based on moiré fringes, large field of view and strong anti-interference ability

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