This paper presents the design and ground verification for vision-based relative navigation systems of microsatellites,which offers a comprehensive hardware design solution and a robust experimental verification metho...This paper presents the design and ground verification for vision-based relative navigation systems of microsatellites,which offers a comprehensive hardware design solution and a robust experimental verification methodology for practical implementation of vision-based navigation technology on the microsatellite platform.Firstly,a low power consumption,light weight,and high performance vision-based relative navigation optical sensor is designed.Subsequently,a set of ground verification system is designed for the hardware-in-the-loop testing of the vision-based relative navigation systems.Finally,the designed vision-based relative navigation optical sensor and the proposed angles-only navigation algorithms are tested on the ground verification system.The results verify that the optical simulator after geometrical calibration can meet the requirements of the hardware-in-the-loop testing of vision-based relative navigation systems.Based on experimental results,the relative position accuracy of the angles-only navigation filter at terminal time is increased by 25.5%,and the relative speed accuracy is increased by 31.3% compared with those of optical simulator before geometrical calibration.展开更多
卫星导航地基增强系统(Ground Based Augmentation System,GBAS),可以提高卫星导航的精度、完好性、连续性和可用性,使飞机在复杂天气和恶劣环境下依然能够实现安全、高效的进近和着陆,满足民航精密进近和着陆引导等高精度导航需求.目前...卫星导航地基增强系统(Ground Based Augmentation System,GBAS),可以提高卫星导航的精度、完好性、连续性和可用性,使飞机在复杂天气和恶劣环境下依然能够实现安全、高效的进近和着陆,满足民航精密进近和着陆引导等高精度导航需求.目前GBAS一类精密进近(CATⅠ)服务水平已经完成验证和应用,但是其定位精度等服务水平仍不能完全满足民航需求.GBAS二类/三类精密进近(CATⅡ/Ⅲ)具有更好的服务水平,其技术和应用仍在开发验证中.为了提高民航运行效率和安全,急需开展基于CATⅡ/Ⅲ与CATⅢ的飞行校验活动.当前GBAS主要采用基于单频GPS的工作模式,在系统可用性、安全性和自主性方面非常受限,因此需要开发自主可控的兼容北斗的GBAS系统.本文设计了飞行校验方案,使用自主研制的国产GBAS设备,设计了飞行校验方案,在西安咸阳机场完成了CATⅡ/Ⅲ盲降精密进近着陆引导的GBAS飞行校验.试验结果表明:兼容北斗的国产GBAS具备支持CATⅡ/Ⅲ精密进近的能力,并且其性能远超传统仪表着陆系统(instrument landing system,ILS).这一成果的取得为我国航空运输的安全性提供了有力保障.展开更多
The Active Particle-induced X-ray Spectrometer（APXS） is one of the payloads on board the Yutu rover of the Chang＇E-3 mission. In order to assess the instrumental performance of APXS, a ground verification test was ...The Active Particle-induced X-ray Spectrometer（APXS） is one of the payloads on board the Yutu rover of the Chang＇E-3 mission. In order to assess the instrumental performance of APXS, a ground verification test was performed for two unknown samples（basaltic rock, mixed powder sample）. In this paper, the details of the experiment configurations and data analysis method are presented. The results show that the elemental abundance of major elements can be well determined by the APXS with relative deviations 〈15 wt.%（detection distance=30 mm,acquisition time=30 min）. The derived detection limit of each major element is inversely proportional to acquisition time and directly proportional to detection distance, suggesting that the appropriate distance should be 〈50 mm.展开更多
基金supported in part by the Doctoral Initiation Fund of Nanchang Hangkong University(No.EA202403107)Jiangxi Province Early Career Youth Science and Technology Talent Training Project(No.CK202403509).
文摘This paper presents the design and ground verification for vision-based relative navigation systems of microsatellites,which offers a comprehensive hardware design solution and a robust experimental verification methodology for practical implementation of vision-based navigation technology on the microsatellite platform.Firstly,a low power consumption,light weight,and high performance vision-based relative navigation optical sensor is designed.Subsequently,a set of ground verification system is designed for the hardware-in-the-loop testing of the vision-based relative navigation systems.Finally,the designed vision-based relative navigation optical sensor and the proposed angles-only navigation algorithms are tested on the ground verification system.The results verify that the optical simulator after geometrical calibration can meet the requirements of the hardware-in-the-loop testing of vision-based relative navigation systems.Based on experimental results,the relative position accuracy of the angles-only navigation filter at terminal time is increased by 25.5%,and the relative speed accuracy is increased by 31.3% compared with those of optical simulator before geometrical calibration.
基金Supported by National Science and Technology Major Project(Chang’E-3 Active Particle-induced X-ray Spectrometer)
文摘The Active Particle-induced X-ray Spectrometer（APXS） is one of the payloads on board the Yutu rover of the Chang＇E-3 mission. In order to assess the instrumental performance of APXS, a ground verification test was performed for two unknown samples（basaltic rock, mixed powder sample）. In this paper, the details of the experiment configurations and data analysis method are presented. The results show that the elemental abundance of major elements can be well determined by the APXS with relative deviations 〈15 wt.%（detection distance=30 mm,acquisition time=30 min）. The derived detection limit of each major element is inversely proportional to acquisition time and directly proportional to detection distance, suggesting that the appropriate distance should be 〈50 mm.
