Three-dimensional grid algorithm for all-sky autonomous star identification

2012 ◽  
Author(s):  
Wen-jun Yi ◽  
Hai-bo Liu ◽  
Jian-kun Yang ◽  
Hui Jia ◽  
Li-xin Yang
Keyword(s):  
Three Dimensional ◽  
Star Identification ◽  
Grid Algorithm

Multigrid Computation of Incompressible Flows Using Two-Equation Turbulence Models: Part II—Applications

1997 ◽  
Vol 119 (4) ◽  
pp. 900-905 ◽  
Author(s):  
X. Zheng ◽  
C. Liao ◽  
C. Liu ◽  
C. H. Sung ◽  
T. T. Huang
Keyword(s):  
Turbulent Flows ◽  
Incompressible Flows ◽  
Stokes Equations ◽  
Three Dimensional ◽  
Turbulence Models ◽  
Navier Stokes ◽  
Navier Stokes Equations ◽  
Time Stepping ◽  
Grid Algorithm ◽  
High Reynolds

In this paper, computational results are presented for three-dimensional high-Reynolds number turbulent flows over a simplified submarine model. The simulation is based on the solution of Reynolds-Averaged Navier-Stokes equations and two-equation turbulence models by using a preconditioned time-stepping approach. A multiblock method, in which the block loop is placed in the inner cycle of a multi-grid algorithm, is used to obtain versatility and efficiency. It was found that the calculated body drag, lift, side force coefficients and moments at various angles of attack or angles of drift are in excellent agreement with experimental data. Fast convergence has been achieved for all the cases with large angles of attack and with modest drift angles.

A grid algorithm for autonomous star identification

1997 ◽  
Vol 33 (1) ◽  
pp. 202-213 ◽  
Author(s):  
C. Padgett ◽  
K. Kreutz-Delgado
Keyword(s):  
Star Identification ◽  
Grid Algorithm

Analysis and Improvement of the Grid Algorithm for Autonomous Star Identification

2016 ◽  
Vol 53 (2) ◽  
pp. 021002 ◽  
Author(s):  
唐武盛 Tang Wusheng ◽  
杨建坤 Yang Jiankun ◽  
衣文军 Yi Wenjun ◽  
贾辉 Jia Hui ◽  
程攀攀 Cheng Panpan
Keyword(s):  
Star Identification ◽  
Grid Algorithm

scholarly journals Star Identification Based on Multilayer Voting Algorithm for Star Sensors

Sensors ◽  
2021 ◽  
Vol 21 (9) ◽  
pp. 3084
Author(s):  
Meiying Liu ◽  
Xin Wei ◽  
Desheng Wen ◽  
Hu Wang
Keyword(s):  
Attitude Determination ◽  
Singular Values ◽  
Identification Process ◽  
Verification Method ◽  
Match Process ◽  
Star Identification ◽  
Grid Algorithm ◽  
Verification Process ◽  
Initial Results ◽  
Initial Match

This paper describes the multilayer voting algorithm, a novel autonomous star identification method for spacecraft attitude determination. The proposed algorithm includes two processes: an initial match process and a verification process. In the initial match process, a triangle voting scheme is used to acquire candidates of the detected stars, in which the triangle unit is adopted as the basic voting unit. During the identification process, feature extraction is implemented, and each triangle unit is described by its singular values. Then the singular values are used to search for candidates of the imaged triangle units, which further improve the efficiency and robustness of the algorithm. After the initial match step, a verification method is applied to eliminate incorrect candidates from the initial results and then outputting the final match results of the imaged stars. Experiments show that our algorithm has more robustness to position noise, magnitude noise, and false stars than the other three algorithms, the identification speed of our algorithm is largely faster than the geometric voting algorithm and optimized grid algorithm. However, it takes more memory, and SVD also seems faster.

The orbit of Pluto over a long interval of time

1966 ◽  
Vol 25 ◽  
pp. 227-229 ◽  
Author(s):  
D. Brouwer
Keyword(s):  
Periodic Orbit ◽  
Numerical Integration ◽  
Restricted Problem ◽  
Three Dimensional ◽  
The Third ◽  
Circular Restricted Problem ◽  
Resonance Relation

The paper presents a summary of the results obtained by C. J. Cohen and E. C. Hubbard, who established by numerical integration that a resonance relation exists between the orbits of Neptune and Pluto. The problem may be explored further by approximating the motion of Pluto by that of a particle with negligible mass in the three-dimensional (circular) restricted problem. The mass of Pluto and the eccentricity of Neptune's orbit are ignored in this approximation. Significant features of the problem appear to be the presence of two critical arguments and the possibility that the orbit may be related to a periodic orbit of the third kind.

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