CN102745345B - Ultraviolet fixed star simulator for calibrating ultraviolet navigation sensor - Google Patents

Abstract

The invention discloses an ultraviolet star simulator for calibrating an ultraviolet navigation sensor, which comprises a black flat panel, an LED lamp, an optical fiber, a deuterium lamp, an optical filter and a modulation disc. An LED lamp is installed in the middle of the black flat panel for simulating the earth. There are N light-transmitting holes around the LED lamp for simulating stars. Each light-transmitting hole is equipped with an optical fiber and a deuterium lamp. The deuterium lamp is used as a light source to output the ultraviolet spectrum of 360nm to 200nm. Between the lamps, optical filters of different ultraviolet bands are installed on the modulation disc, and the rotation of the motor drives the modulation disc to drive the rotation of the optical filter to make the optical fiber radiate ultraviolet light of different spectral bands. The invention adopts the combination of quartz optical fiber to simulate the ultraviolet spectral radiation of stars, and the quartz optical fiber simulates the ultraviolet spectral radiation model of ultraviolet single star and multi-star in different combinations. Figure static and dynamic calibration problems.

Description

An ultraviolet star simulator for calibrating ultraviolet navigation sensors

technical field

The invention relates to an ultraviolet star simulator, in particular to an ultraviolet star simulator used for calibrating ultraviolet navigation sensors.

Background technique

The working principle of the ultraviolet navigation sensor is derived from the ultraviolet three-axis earth attitude sensor. The patent No. US5837894 applied by Honeywell Company of the United States is called "WideField of View Sensor with diffrativeOptical Corrector". The three-axis attitude sensor uses a combined reflective dihedral reflective array and a ball lens system to form a combined optical system with a large field of view. The field of view is used to observe other celestial objects, which constitutes an optical system with two information channels and an unconventional optical system that is sensitive to two information channels (such as stars and the earth) at the same time. After processing, three-axis attitude data and autonomous navigation data are provided to the satellite.

Patent No. 200810057342.1 discloses an optical system of an ultraviolet navigation sensor, the optical system includes: inclined mirrors, plane mirrors, N-face cone mirrors, N filter mirrors, combined ball lenses, binary optics Components, fiber optic combination panels, CCD receivers. The patent can be used to receive ultraviolet light from stars and the earth.

At present, the ultraviolet navigation sensor used in high orbit is a solar-blind ultraviolet spectrum near 300nm that can observe stars and the earth at the same time, and simultaneously image the ultraviolet navigation sensor on the CCD. During the development of the ultraviolet navigation sensor, it is necessary to Since the ground cannot know the real situation of the ultraviolet navigation sensor in space, it is necessary to establish a star simulator in the ultraviolet spectrum to calibrate the ultraviolet navigation sensor. At present, the existing star simulators are all in the visible spectrum, and the luminous target surface is realized by a liquid crystal light valve. The pre-installed star map is controlled by software, and the distribution of space star points can be displayed arbitrarily. Liquid crystal light valves cannot pass through ultraviolet light, nor can liquid crystal light valves be used to simulate star radiation and star distribution, so they cannot be used as a calibration device for ultraviolet star sensors.

Contents of the invention

The technical solution problem of the present invention is: overcome the deficiencies in the prior art, provide a kind of ultraviolet star simulator that is used for calibrating the ultraviolet navigation sensor, the composition of the present invention is simple, can simulate the ultraviolet spectrum of ultraviolet single star, multi-star, realized Calibration of UV navigation sensors.

The technical solution of the present invention is: a kind of ultraviolet star simulator that is used for calibrating the ultraviolet navigation sensor, comprises black panel, LED lamp, optical fiber, deuterium lamp, optical filter and modulation disc, and a LED lamp is installed in the middle of black panel To simulate the earth, there are N light-transmitting holes around the LED lamp for simulating stars. Each light-transmitting hole is equipped with an optical fiber and a deuterium lamp. The deuterium lamp is used as a light source to output the ultraviolet spectrum of 360nm to 200nm. The modulation disc is set at Between the optical fiber entrance and the deuterium lamp, filters of different ultraviolet spectrums are installed on the modulation disc, and the rotation of the motor drives the modulation disc to drive the rotation of the filter to make the optical fiber radiate ultraviolet light of different spectrums. The range is 360nm ~ 200nm.

Compared with the prior art, the present invention has the beneficial effects that: the present invention uses a combination of quartz fibers to simulate the ultraviolet spectrum radiation of stars, and the range of the ultraviolet band is 360nm to 200nm. Spectral radiation model, the invention has a simple structure and is easy to implement, and solves the problem of static and dynamic calibration of ultraviolet star points and star maps of ultraviolet navigation sensors.

Description of drawings

Fig. 1 is the star point distribution schematic diagram of the present invention;

Fig. 2 is a schematic diagram of the composition of the lighting system of the present invention;

Fig. 3 is an effect diagram of static calibration of an ultraviolet navigation sensor by using the present invention.

Detailed ways

The invention adopts quartz optical fiber to simulate space ultraviolet star distribution and corresponding ultraviolet spectral radiation. A uniform luminous plane with a diameter of Ф200 composed of LED devices is used to simulate the ultraviolet earth, and the spectrum at the edge of the quasi-ultraviolet earth is 395nm. Multiple bundles of optical fibers are distributed around the simulated ultraviolet earth, and each bundle is composed of multiple optical fibers to form different numbers of simulated ultraviolet stars. Interval lighting is implemented, distributing them around the UV globe. In this way, the distribution of ultraviolet single stars and multi-stars and the ultraviolet spectral radiation model are simulated. Star groups and single stars can be used as static targets or as dynamic targets. By modulating the light sources of different star groups, each star group is controlled to emit radiant light at different times, thereby simulating the effect of the sensor scanning the starry sky. It is used for static and dynamic simulation testing and calibration of UV star points and star maps for ground UV sensors.

As shown in Figures 1 and 2, the present invention includes a black flat panel, LED lights, optical fibers, deuterium lamps, optical filters and modulation discs, the black flat panel is used as the background of the ultraviolet star simulator, and an LED lamp is installed in the middle of the black flat panel for simulating the earth , there are N light holes around the LED lamp for simulating stars, each light hole is equipped with an optical fiber and a deuterium lamp, the deuterium lamp is used as a light source to output the ultraviolet spectrum of 360nm ~ 200nm, and the modulation disc is set between the entrance of the fiber and a deuterium lamp. Between the deuterium lamps, filters of different ultraviolet spectrums are installed on the modulation disc, and the modulation disc is driven by a motor to make the optical fiber radiate ultraviolet light of different spectrums, and the spectral range of the filters is 360nm to 200nm. The configuration of star points can be configured with multiple star points, or multiple groups of mixed settings.

The present invention selects a quartz optical fiber with a diameter of 0.5mm to manufacture a star point with a diameter of 0.22mm. A single optical fiber can simulate a single star, and a combination of multiple optical fibers can simulate multiple stars. The angular distance distribution between multiple stars can be freely combined.

The space background outside the Earth's atmosphere is the cold background of deep space with a radiation temperature of about 3.5K. Stars glow against a black background, emitting different spectra due to the temperature of the stars. The ultraviolet spectrum emitted by <300nm ultraviolet stars is invisible, and the radiation spectrum of the deuterium lamp used for ultraviolet almost covers the entire ultraviolet spectrum range, which is the best choice for ultraviolet light source. The light source adopts the ultraviolet light source deuterium lamp, the deuterium lamp is the most ideal ultraviolet light source at present, it can radiate a continuous spectrum of 190nm ~ 400nm, and has good radiation intensity and stability. The selection of different wavelength bands can be realized through optical filters. In the present invention, according to the characteristics of the radiation spectrum of the observation object, the output spectrum range of the deuterium lamp is selected from 360nm to 200nm. The model of the ultraviolet light source deuterium lamp adopts DD2.5.

The ultraviolet star mode can be designed into static and dynamic test modes. The star point can be displayed as a single star or multiple stars. The radiance of the star point can be realized by changing the distance between the light source and the fiber input end; the spectrum can be selected by changing the corresponding filter. When statically calibrating the UV sensor, set the distance between the simulator and the sensor according to the field of view of the sensor optical system; turn on the simulated UV Earth and UV star light sources; turn on the power of the UV sensor and the controller , as shown in Figure 3, the target image formed by the sensor optical system should be displayed on the display at this time, that is, the simulated ultraviolet earth and the ultraviolet star groups around it. According to the gray value corresponding to the target image on the display, the distance between the light source and the optical fiber can be adjusted to realize the increase and decrease of the gray value of the target image. If the dynamic test is carried out, the display frequency of each group of star points can be realized by modulating the light at the input end of each combined fiber group. The modulation disc can be turned on and the modulator scans several fiber groups successively. At this time, the corresponding fiber group The scintillation radiates the corresponding band, and the modulation disc is driven by a motor with adjustable speed.

The star point extraction algorithm is composed of star threshold determination and star point search in the traditional way. In the process, pseudo stars will be removed according to the characteristics of the star size, etc., and then the centroid calculation and star map recognition will be performed. Here we directly refer to the star map recognition of the ultraviolet navigation sensor. , tracking and attitude calculation methods will not be described in detail.

According to the verification data of the ultraviolet navigation sensor, the attitude angle of the earth is on the order of 0.02°, and the inertial attitude obtained by the stars is 27°. Therefore, the high-orbit ultraviolet sensor can obtain a similar navigation accuracy of 2km.

The content not described in detail in the present invention is well known to those skilled in the art.

Claims (1)

1. a kind of ultraviolet star simulator for calibrating ultraviolet navigation sensor, it is characterized in that: comprise black panel, LED lamp, optical fiber, deuterium lamp, optical filter and modulating disc, an LED lamp is installed in the middle of black panel for simulating On the earth, there are N light-transmitting holes around the LED light to simulate stars. Each light-transmitting hole is equipped with an optical fiber and a deuterium lamp. The deuterium lamp is used as a light source to output the ultraviolet spectrum of 360nm-200nm. The modulation disc is set at the entrance of the optical fiber. Between the reticle and the deuterium lamp, filters of different ultraviolet spectrums are installed on the modulation disc, and the rotation of the motor drives the modulation disc to drive the rotation of the filter to make the optical fiber radiate ultraviolet light of different spectrums. The spectrum range of the filter is 360nm～200nm.