Ultraviolet navigation sensor

Abstract

The invention discloses an ultraviolet navigation sensor which employs an optical system with two spectrum bands images different objects to respective independent areas on the target surface of a photodetector, simultaneously are divided into two independent viewing field channels which respectively image earth and stars. The photodetector converts images of the earth and the stars into a stimulating signal to output. An electrical system samples, extracts and converts the stimulating signal to obtain digital images. At last, an image and attitude computing element respectively processes theultraviolet earth information and the visible light star information and computes and obtains a geocentric vector, an orbit height and an inertial attitude needed by satellite navigation. The ultraviolet navigation sensor employs the technique of sub-spectrum-bands, sub-viewing-fields and sub-imaging-areas, and resolves the problem that the photodetector simultaneously images the earth and the stars on the same target surface. In addition, the ultraviolet navigation sensor has a normal imaging mode and a binning imaging mode, thereby enhancing the detection sensitivity of the system and increasing the update rate of data.

Description

technical field [0001] The invention relates to an ultraviolet navigation sensor, which belongs to the field of optical sensors in attitude track control systems on spacecraft. Background technique [0002] With the rapid advancement of imaging detection devices and processor technology, spacecraft attitude sensors have gradually developed from unit scanning to imaging, and with the success of imaging star sensors, imaging earth sensors, and imaging moon sensors On-orbit flight, the optical sensor begins to develop in the direction of a broader function-optical autonomous navigation sensor. It can give both the three-axis satellite attitude and the orbital position, which can greatly reduce the burden on the ground measurement and control station. Enhancing the autonomy and survivability of the spacecraft is an important part of the intelligent control system of the spacecraft. [0003] The MANS system developed by the United States in the 1990s uses the information of the ...

AI Technical Summary

Problems solved by technology

[0004] U.S. Patent No.: US5837894, title: Wide Field of View Sensor with diffractive Optical Corrector, this patent discloses a three-axis attitude sensor using the ultraviolet spectrum, without dividing the stars, the earth's field of view channels and the imaging area, so that the information It is very difficult to process and identify the earth and stars during processing; in addition, it uses a unified ultraviolet spectrum to make the energy of stars and the earth weak, and an image intensifier must be added to amplify the signal in order to image normally

[0005] U.S. Patent No.: US5319969, name: Method for determining 3-axis spacecraftattitude, this patent introduces a three-axis attitude determination method using an ultraviolet spectrum attitude sensor, including image preprocessing, bright edge extraction and attitude calculation, the disadvantage is that It needs ephemeris information to calculate the earth imaging model in orbit, and obtain the attitude angle by comparing the measurement information, which is cumbersome

[0006] U.S. Patent No.: US5189295, name: Three axis earth / star sensor, this patent introduces a three-axis attitude sensor using the visible spectrum segment, its shortcoming is that it is sensitive to the earth using the visible spectrum segment and is easily affected by the atmosphere to cause errors , in addition, the segmentation of the imaging area is not performed, which makes subsequent star point extraction and earth edge extraction very difficult

Images