The Journal of the Astronautical Sciences

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Optical Navigation Preparations for the New Horizons Kuiper-Belt Extended Mission
The Journal of the Astronautical Sciences - Tập 67 - Trang 1169-1188 - 2019
Derek S. Nelson, Erik J. Lessac-Chenen, John Y. Pelgrift, Coralie D. Adam, Frederic J. Pelletier, John R. Spencer, Mark E. Holdridge, Harold A. Weaver, Catherine B. Olkin, S. Alan Stern
Acquiring and processing astrometric measurements of a spacecraft’s target using on-board images, generically referred to as optical navigation, is an integral function of the orbit determination and navigation of NASA’s New Horizons spacecraft. Since New Horizons’ reconnaissance of the Pluto system in July 2015, many preparations have been completed to further enhance the optical navigation syste... hiện toàn bộ
Covariance analysis for deep-space satellites with radar and optical tracking data
The Journal of the Astronautical Sciences - Tập 55 - Trang 237-243 - 2012
James G. Miller
Covariance analysis for the special perturbations orbit determination problem for deepspace satellites is considered to determine the relative merit of radar and optical tracking data. Deep-space radars provide very accurate range measurements, but less accurate angle measurements. Optical sensors provide very accurate angle measurements, but make no range measurements since they are passive syste... hiện toàn bộ
Focal-Plane Representation of Rotations
The Journal of the Astronautical Sciences - Tập 48 - Trang 381-390 - 2020
Malcolm D. Shuster
The general mathematical formalism for representing rotations in terms of focal-plane coordinates is presented. Explicit and recursive expressions are given for the focal-plane transformation expansion coefficients, and the reconstruction of the rotation matrix from the focal-plane coefficients is presented.
Swarm Optimization of Lunar Transfers from Earth Orbit with Operational Constraints
The Journal of the Astronautical Sciences - Tập 67 - Trang 880-901 - 2019
Justin R. Mansell, Samantha Dickmann, David A. Spencer
Due to the frequent launches of primary satellites into geosynchronous transfer orbits, lunar transfer from an initial geosynchronous transfer orbit represents an attractive option for secondary payloads with lunar mission objectives. The development of advanced launch vehicle upper stages with low boil off rates and restartable engines further enhances the potential of geosynchronous transfer orb... hiện toàn bộ
Spin-axis attitude estimation
The Journal of the Astronautical Sciences - - 2007
Sergei Tanygin, Malcolm D. Shuster
Precise Formation-Flying Telescope in Target-Centric Orbit: the Solar Case
The Journal of the Astronautical Sciences - Tập 67 - Trang 1391-1411 - 2020
Pascal Saint-Hilaire, Jeffrey E. Marchese
We present the general concept of a telescope with optics and detectors mounted on two separate spacecrafts, in orbit around the telescope’s target (scopocentric or target-centric orbit), and using propulsion to maintain the Target-Optics-Detector alignment and Optics-Detector distance. Specifically, we study the case of such a telescope with the Sun as the target, orbiting at $\sim $ 1 AU. We pre... hiện toàn bộ
Relative Equilibria of a Prolate Gyrostat with a Discrete Damper
The Journal of the Astronautical Sciences - Tập 50 Số 4 - Trang 367-387 - 2002
Ralph A. Sandfry, Christopher D. Hall
K-Vector ND và Ứng Dụng của Nó trong Việc Xây Dựng Danh Mục Nhận Diện Sao Phi Denim Dịch bởi AI
The Journal of the Astronautical Sciences - Tập 58 - Trang 261-274 - 2013
Benjamin B. Spratling, Daniele Mortari
Một thuật toán tìm kiếm theo phạm vi đa chiều trực giao, K-vector đa chiều (K-Vector ND), được trình bày. Thuật toán này được phân tích và cho thấy thời gian thực thi không phụ thuộc vào kích thước của cơ sở dữ liệu, đối với các tập dữ liệu phân bố đồng đều. Các thử nghiệm số được thực hiện nhằm xác định lợi thế hiệu suất so với cây bốn phân (Quad-Tree) đối với tập dữ liệu hai chiều. Kết quả dao đ... hiện toàn bộ
#K-Vector ND #tìm kiếm phạm vi đa chiều #cây bốn phân #nhận diện sao #thuật toán hiệu suất
A new strategy for lunar soft landing
The Journal of the Astronautical Sciences - Tập 55 - Trang 373-387 - 2012
Xu Shijie, Zhu Jianfeng
A new strategy based on a windlass device is proposed to deal with the terminal descent of a lunar soft landing mission in this paper. The lunar lander considered here consists of a rover and an assist module (AM) which is equipped with three decelerating thrusters and a lateral thruster. The rover and the AM are connected by a tether (mass is negligible) which winds around the windlass. The dynam... hiện toàn bộ
Improvements in Mars Gravity Field Determination Using Ridge-Type Estimation Methods
The Journal of the Astronautical Sciences - - 2020
Clifton F. Minter, David A. Cicci
The use of ridge-type estimation methods in determining the proper weighting of the a priori covariance appears to improve the accur acy of the Mars50c gravity field model derived from Viking and Mariner 9 Doppler tracking data. These advanced parameter estimation techniques were applied to the calculation of GM and a (50 × 50) field of harmonic coefficients, representing the gravitational potenti... hiện toàn bộ
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