Multi-color-temperature and multi-star-magnitude single-star simulator

Abstract

The invention discloses a multi-color-temperature and multi-star-magnitude single-star simulator and belongs to the field of aerospace optical remote sensing. In order to reduce the influence of non-matching of color temperatures on calibration precision, the single-star simulator comprises a multi-color-temperature simulative light source system, a star magnitude controller system, a conductive optical fiber, a collimation and calibration system and a control system, wherein the multi-color-temperature simulative light source system is used for generating light with specific color temperature; the light with specific color temperature, emitted by the multi-color-temperature simulative light source system, enters the star magnitude controller system; the input light with specific color temperature is converted into light with specific color temperature and specific star magnitude by the star magnitude controller system; the light with specific color temperature and specific star magnitude is transmitted to the collimation and calibration system by the conductive optical fiber; the collimation and calibration system is used for generating collimating light and calibrating the multi-color-temperature and multi-star-magnitude single-star simulator; the control system is used for controlling the multi-color-temperature and multi-star-magnitude single-star simulator. The multi-color-temperature and multi-star-magnitude single-star simulator can reduce the influence of non-matching of the color temperature of a star simulator for calibration of a star sensor and the color temperature of the star simulator for gazing stars on calibration precision.

Description

technical field [0001] The invention belongs to the field of aerospace optical remote sensing, and in particular relates to a multi-color-temperature multi-satellite single-satellite simulator applied to the optical signal calibration of a star sensor. Background technique [0002] The star sensor mainly uses the CCD to receive the light emitted by the stars through the optical system, and process the data into the observed star map and compare it with the navigation star map pre-stored in the database to obtain the position and attitude of the spacecraft in the starry sky. One of the key technologies in the star sensor is to receive the light emitted by stars, so it is necessary to calibrate the optical signal receiving equipment of the star sensor. The calibration of the optical signal receiving equipment can be divided into on-orbit calibration and ground calibration. On-orbit calibration is not only dangerous, but also extremely expensive. Therefore, it is imperative to ...

AI Technical Summary

Problems solved by technology

However, the temperature of the stars in the universe is different, and the radiation spectrum distribution of the stars is also different. Any receiver (such as a CCD receiver) has its own response range and response curve, which requires the calibration of the receiver when calibrating the light source The color temperature of the detected star is consistent with the color temperature table, that is, the color temperature of the calibrated light source matches the color temperature of the detected star (also called spectral matching), otherwise, this spectral mismatch will bring measurement errors to the receiver. Chen Feng et al. simulated and analyzed the errors caused by spectral mismatch on the calibration of optical remote sensors ("Optical Precision Engineering", Volume 16, No. 3, 2008, P415). However, for panchromatic optical remote sensors, the relative measurement error caused by spectral mismatch cannot be ignored. This conclusion also applies to the calibration process of the star sensor, that is, the color temperature of the star simulator The color temperature mismatch with the star sensor for stargazing will affect the calibration accuracy of the star sensor light signal

Images