Design Of A Control System For A Single-satellite Simulator

The star sensor is a very critical device component in the attitude measurement of the spacecraft.The star simulator is one of the components for testing and calibrating the star sensor in the laboratory.The static star simulator can simulate a single or a few in space.Technical parameters such as magnitude,color temperature,size and spectral characteristics of each star.Therefore,the technical parameters such as the accuracy and stability of the star simulator will directly affect the calibration and testing of the star sensor.The static single-star simulator developed in this paper can truly simulate the magnitude and color temperature of stars under laboratory conditions,so as to facilitate the calibration of star sensors on the ground.By analyzing the common shortcomings of single-star simulators developed on the market,such as complex structure,large size,low accuracy,high cost,and poor stability,combined with the technical indicators of the star sensor and the actual engineering requirements of the single-star simulator,This article designs a new type of single-satellite simulator solution.The single-star simulator is composed of 13-band light intensity controllers,and uses a distributed halogen tungsten light source as the simulated light source when the single-star simulator is working,and passes through the band-pass filter and the band-pass filter in each band light intensity controller.Gradual neutral density filter to control the spectral range and intensity of light,so as to simulate the changes of color temperature and magnitude in real time.Compared with the traditional single-star simulator that requires two independent light path control units to simulate the equivalent color temperature and equivalent magnitude,the light intensity controller for each channel in the single-star simulator developed in this paper can not only be used on the road The spectral range of light can be adjusted,and its light intensity can also be adjusted and attenuated in a wide range,so as to form an equivalent color temperature and magnitude.This design scheme not only simplifies the system structure,reduces the size of the single-satellite simulator,but also improves the working accuracy and stability of the single-satellite simulator.The experimental test data proves that the various technical indicators of the single-star simulator designed in this paper meet the actual requirements of the specific project.It has the advantages of fast calibration speed,high working accuracy,and good stability,and meets the calibration requirements of the star sensor in the laboratory.The article mainly introduces the basic design of the single-star simulator,the feasibility analysis of specific technical indicators,and the important components of the single-star simulator-the internal structure and working principle of the band light intensity controller,and the principle of the system control circuit(including Light intensity control,light intensity measurement,encoder,stepper motor drive,communication circuit and other modules),software system design(including upper computer software design and single-chip software design modules)and experimental calibration and testing(including light intensity within 8 hours Stability,equivalent star magnitude,equivalent color temperature and other test items)work.