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第三届中国卫星导航学术年会

作者： *LI Yi1,2,3,ZHANG Shancong1,WU Changqing1,XU Wei1(1.Beijing UCAS Space Technology CO., Ltd, Beijing 100190, China2. Academy of Opto-Electronics, Chinese Academy of Science, Beijing 100094,China3. Graduate University of Chinese Academy of Science,Beijing 100049,China)

In order to improve the precision of relative navigation for formation flying spacecrafts,a relative navigation scheme based on differential gnss was proposed , the method of differential-pseudo-range smoothed by double-differential carrier phase was applied for the distance measurement. The measurement vector included the relative distance , azimuth and elevation between spacecrafts. The extended Kalman filter was adopted to estimate the relative position and velocity. Taking the relative dynamic formula based on non-singularity orbit elements as the state equation instead of the traditional C-W formula,the restriction of eccentricity could be ignored,the transform formula between relative non-singularity orbit elements and relative position（velocity） between spacecrafts was derived, by which the singular point in the Kepler’s elements was avoided. Corresponding numerical simulation and experimental demonstration was provided to verify the precision of relative navigation,the scheme proposed by the paper was proved to be available.

关键词： differential gnss Relative autonomous Navigation Non-Singularity Orbit Elements EKF Formation flying

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A study of ionospheric scintillation effects on differential gnss

A study of ionospheric scintillation effects on Differential...

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第三届中国卫星导航学术年会

作者： Liu Dun,Deng Zhongxin,Feng Jian,Zhen Weimin China Research Institute of Radiowave Propagation,Qingdao 266107,China

Irregularly structured ionospheric regions can cause diffraction and scattering of trans-ionospheric gnss *** received at an antenna,these signals present random temporal fluctuations in both amplitude and phase,as known ionospheric *** addition to worsening the signal quality,ionospheric irregularity related to scintillation will break down the spatial correlation structure of ionosphere,leading to a degradation of differential gnss *** the data analysis shows that during a scintillation event,the length of baseline on which Dgnss could be used will be reduced to a much shorter distance comparing with that under undisturbed ionosphere *** residual error caused by scintillation related irregularity increases as the length of baseline increase during the scintillation *** residual error under scintillation could be 2～4 times bigger than that of no scintillation *** accuracy of Scintillation effected Dgnss is even worse than that of under quiet ionosphere condition for baselines longer than 20km as indicated by our analysis in this paper.

关键词： gnss Ionosphere Scintillation differential gnss

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The precise multimode gnss positioning for UAV and its application in large scale photogrammetry

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Geo-Spatial Information Science 2016年第3期19卷 188-194页

作者： Hongxing Sun Leilei Li Xuewen Ding Bingxuan Guo State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhanChina College of Aerospace Engineering Chongqing UniversityChongqingChina

In this paper,we use multimode gnss instead of single GPS constellation to resolve the three exterior line elements of each *** principles of differential gnss positioning and gnsssupported aerial triangulation(AT)are presented and an implementation case is *** multi-constellation system,the number of visible satellites is significantly increased and the geometry distribution of the satellites is well *** positioning accuracy and robustness are therefore getting better compared to GPS *** results show that differential gnss has remarkable increment on the integer rate of ambiguity solution when GPS has few number and low elevation angle of *** combined AT adjustment of gnss resolution and 10 ground control points(GCPs)achieve the horizontal accuracy of±18 cm and vertical accuracy of±23 cm for the check points,which are comparable with traditional bundle adjustment with dense GCPs and better than GPS-supported *** achieved accuracy also satisfies the requirement for 1:500 topographic maps with the bonus of 84%GCPs *** conclusion,gnss-supported AT is of feasibility and superiority for large scale Unmanned Aerial Vehicle-based photogrammetry.

关键词： Multi-constellation differential gnss UAV photogrammetry gnss-supported aerial triangulation

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