The Research And Ground Validation Of Atomic Frequency Discrimination Deep Space Autonomous Navigation Velocity Measurement Technology

Recent years,deep space exploration has gradually become a hot topic in the field of aerospace all over the world.Deep space navigation is one of the important preconditions for deep space exploration.Aiming at autonomous navigation in deep space,the research of atomic frequency discrimination Doppler velocimetry navigation is carried out in this paper.Atomic Frequency Discrimination Doppler Velocimetry Navigation is an astronomical spectral Velocimetry Navigation method.Using the spectral information of space visible celestial bodies as navigation information source,the Doppler frequency shift of spectral lines reaching the Deep-Space explorer is measured in real time,and the apparent velocity of Deep-Space explorer relative to multiple navigation celestial bodies is obtained.The vector velocity information of the Deep-Space explorer is obtained by vector synthesis,which assists the Deep-Space explorer in autonomous velocity measurement and navigation.According to the requirement of autonomous navigation in deep space and based on the principle of atomic frequency discrimination,this paper presents a technical scheme for measuring the velocity of Deep-Space explorer by using the Doppler shift of the stellar spectrum.Based on the anomalous dispersion mechanism,the scheme relies on the energy level transition of the atom excited by light to form the resolution of light frequency,which requires less environmental conditions,so that the atomic frequency discriminator has high spectral resolution and high stability at the same time.The high spectral resolution and high stability of atomic frequency discriminator inspire this paper to carry out the research of atomic frequency discriminator Doppler velocimetry navigation.The main research work of this paper includes:This paper introduces the research background of deep space navigation velocity measurement,its important significance in deep space exploration activities,and introduces in detail the development history and current situation of related application fields and the development trend of deep space navigation velocity measurement technology.The basic knowledge of atomic frequency discriminator is introduced,including the principle of atomic frequency discriminator,the structure and testing method of atomic frequency discriminator,and the principle of atomic frequency discriminator Doppler velocimetry is described in detail.The main research work of this paper is as follows:The atomic frequency discriminator for deep space autonomous navigation is designed and developed,and the developed atomic frequency discriminator is tested and validated.The sensitivity of atomic frequency discriminator to laser is tested by the experiment of atomic frequency discriminator sensitivity.The Doppler velocimetry ability of atomic frequency discrimination velocimeter is verified by the verification experiment of rotating disc velocimetry.The ground validation experiment of atomic frequency discrimination solar velocity measurement verifies the ability of atomic frequency discrimination tachometer to measure velocity by Doppler shift of solar Fraunhofer spectrum.The innovations of this paper are as follows:1)Aiming at the application of deep space autonomous navigation,a scheme of velocity measurement for deep space detectors using atomic monitoring of spectral Doppler shift of stars is proposed.2)According to the scheme,an atomic frequency discrimination velocimeter for deep space autonomous navigation is designed and developed.The velocimetry ability and accuracy of the velocimeter are tested by using narrow linewidth laser and turntable speed measuring device.3)A validation experiment scheme for measuring the relative radial velocity between the ground observation point and the sun is proposed,and an experimental device is set up.The radial velocity between the earth observation point and the sun is obtained,and the observed data agree well with the theoretical calculation results.