The low frequency errors (LFE) of star trackers are the most penalizing errors for high-accuracy satellite attitude determination. Two test star trackers- have been mounted on the Space Technology Experiment and Climate Exploration (STECE) satellite, a small satellite mission developed by China. To extract and compensate the LFE of the attitude measurements for the two test star trackers, a new approach, called Fourier analysis, combined with the Vondrak filter method (FAVF) is proposed in this paper. Firstly, the LFE of the two test star trackers' attitude measurements are analyzed and extracted by the FAVF method. The remarkable orbital reproducibility features are found in both of the two test star trackers' attitude measurements. Then, by using the reproducibility feature of the LFE, the two star trackers' LFE patterns are estimated effectively. Finally, based on the actual LFE pattern results, this paper presents a new LFE compensation strategy. The validity and effectiveness of the proposed LFE compensation algorithm is demonstrated by the significant improvement in the consistency between the two test star trackers. The root mean square (RMS) of the relative Euler angle residuals are reduced from [27.95'', 25.14'', 82.43''], 3σ to [16.12'', 15.89'', 53.27''], 3σ.
Download full-text PDF |
Source |
---|---|
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5087457 | PMC |
http://dx.doi.org/10.3390/s16101669 | DOI Listing |
Sci Rep
December 2024
Information Science and Engineering School, Northeastern University, Shenyang, 110819, Liaoning, China.
In this paper, a two-level search strategy fused with an improved no-fit polygon algorithm and improved bat algorithm is proposed to obtain the layout points of multiple vehicles. Additionally, a space-time scheduling strategy is proposed using the Improved D*Lite Algorithm (ID*Lite) and improved Bezier curve to generate the trajectories of individual vehicles. Furthermore, a conflict resolution strategy is introduced to address the collision conflict problem during multi-vehicle scheduling.
View Article and Find Full Text PDFAMB Express
December 2024
School of Biological Engineering, Huainan Normal University, Huainan, 232038, Anhui, People's Republic of China.
Functional fermentation strains were isolated and screened from traditional fairy beans in northern Anhui. Through technical identification, Bacillus subtilis SXD06 was determined to be the superior fermentation strain, while Wickerhamomyces anomalus YE006 was identified as the optimal aroma-producing yeast. Utilizing single-factor experiments and response surface optimization, a Central Composite Design fermentation and blending model was established.
View Article and Find Full Text PDFPediatr Pulmonol
December 2024
Department of Pediatrics & Kawasaki Disease Research Center, University of California San Diego (UCSD) & Rady Children's Hospital, San Diego, California, USA.
Importance: There is growing understanding that Social Determinants of Health (SDH) impact on the outcomes of different pediatric conditions. We aimed to determine whether SDH affect the severity of MIS-C.
Design: Retrospective cohort study, 2021-2023.
J Agric Food Chem
December 2024
Department of Food Science and Technology, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, People's Republic of China.
Cholesterol (Cho) is commonly used to stabilize nanoliposomes; however, there is controversy on the relationship between Cho and health. In this study, we developed a novel multifunctional nanoliposome utilizing structurally similar sitogluside (SG) and dioscin (Dio) instead of Cho to anchor the phospholipid bilayer and synergistically modulate the membrane properties of the nanoliposome (DPPC or DOPC). The storage and gastrointestinal tract stability experiment demonstrated that the changes of physical and chemical properties, including the significantly reduced size and Dio retention rate of nanoliposomes synergistically modulated by SG and Dio compared to those of SG alone, regulated nanoliposomes.
View Article and Find Full Text PDFJ Int Med Res
December 2024
Department of Pediatrics, Ministry of National Guard Health Affairs, Jeddah, Saudi Arabi.
Objective: Duchenne muscular dystrophy (DMD) is a rare X-linked neurodegenerative disorder caused by mutations in the gene. This study examined the efficacy and safety of ataluren, the first oral treatment for DMD with nonsense mutations (nmDMD), in patients in the Middle East.
Methods: This retrospective longitudinal study assessed the outcomes of seven boys with nmDMD who received treatment with ataluren and follow-up at a single center since 2016.
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!