A Study of an Autonomous Unknown Landmark Tracking Navigation System PDF Download
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Author: Howard T. Hendrickson
Publisher:
ISBN:
Category :
Languages : en
Pages : 21
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Book Description
A prime candidate for autonomous space navigation is unknown landmark tracking. An Aerospace Corporation digital computer program called ONAP (Orbit Navigation Analysis Program) was used for a simulation study of autonomous unknown landmark tracking. This program employs a sequential filter and provides both error analysis and Monte Carlo simulation capabilities. It also allows for the inclusion of all significant error sources, i.e., initial landmark location errors, instrument errors, attitude errors, geopotential and atmospheric model errors, and initial condition errors. The study included the generation of algorithms to avoid numerical problems resulting from limited state vector observability. Various successful initialization schemes were considered, including the one recommended by Bellantoni. A baseline system with all error sources considered was studied and found to be feasible if the proper algorithm was selected. (Author).
Author: Howard T. Hendrickson
Publisher:
ISBN:
Category :
Languages : en
Pages : 21
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Book Description
A prime candidate for autonomous space navigation is unknown landmark tracking. An Aerospace Corporation digital computer program called ONAP (Orbit Navigation Analysis Program) was used for a simulation study of autonomous unknown landmark tracking. This program employs a sequential filter and provides both error analysis and Monte Carlo simulation capabilities. It also allows for the inclusion of all significant error sources, i.e., initial landmark location errors, instrument errors, attitude errors, geopotential and atmospheric model errors, and initial condition errors. The study included the generation of algorithms to avoid numerical problems resulting from limited state vector observability. Various successful initialization schemes were considered, including the one recommended by Bellantoni. A baseline system with all error sources considered was studied and found to be feasible if the proper algorithm was selected. (Author).
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 704
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Book Description
Author: Charlie Rose
Publisher:
ISBN:
Category :
Languages : en
Pages : 69
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Book Description
The question of whether a beacon tracker, similar to the NRL Rad-Hard Star Tracker, can be successfully used in a Landmark Tracking AutoNav application rests squarely on the accuracies required, the number of beacons available, and their optical characteristics as well as distribution over the surface of the Earth. Basically, we have found that a star tracker can be used in a landmark approach, but only within some rather severe constraints: (1) Beacons can be distributed more-or-less uniformly over the Earth. Restriction to the United States does not seem feasible; (2) Position errors of several kilometers can be tolerated between updates; (3) A very sophisticated orbit propagator is built into the system. There are non-trivial problems associated with this approach to the problem. Most of them stem from the fact that the tracker would be used in a way for which is was not designed nor intended. (1) The beacons 'twinkle'; (2) The light from the beacons is refracted by the atmosphere by varying amounts which can be only partially compensated for; (3) The tracker's field of view is too small; it greatly reduces the number of targets that can be seen, as well as the durations of observations. This results in fewer updates, and necessitates a very sophisticated orbit propagator; (4) The already too few beacons can be obscured by cloud cover. This is, perhaps, the most egregious problem with this approach. (FR).
Author: Ira A. Gura
Publisher:
ISBN:
Category :
Languages : en
Pages : 114
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Book Description
Several autonomous satellite navigation configurations were studies on a common low-altitude basis with the emphasis on accuracy and convergence. Analysis was performed by simulations using recursive filtering techniques. Configurations investigated included horizon sensors, unknown landmark tracking, known landmark tracking, and one-way doppler systems. Relevant sensor combinations were analyzed to determine possible performance augmentation. (Author).
Author: J. P. Chretien
Publisher: Elsevier
ISBN: 1483298612
Category : Technology & Engineering
Languages : en
Pages : 326
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Book Description
Presents an authoritative overview of the recent developments and technical advances in the applications of automated control to space technology. Topics covered include: geostationary satellites, scientific satellites, flexible systems, low earth orbit satellites, orbit and trajectory control, component technology, platforms, rendez-vous and docking (RVD) and manipulators. Contains 39 research and review papers.
Author: University of Toronto. Institute for Aerospace Studies
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 748
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Book Description
Author: Sergiyenko, Oleg
Publisher: IGI Global
ISBN: 1522599266
Category : Computers
Languages : en
Pages : 390
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Book Description
As technology continues to develop, certain innovations are beginning to cover a wide range of applications, specifically mobile robotic systems. The boundaries between the various automation methods and their implementations are not strictly defined, with overlaps occurring. Specificity is required regarding the research and development of android systems and how they pertain to modern science. Control and Signal Processing Applications for Mobile and Aerial Robotic Systems is a pivotal reference source that provides vital research on the current state of control and signal processing of portable robotic designs. While highlighting topics such as digital systems, control theory, and mathematical methods, this publication explores original inquiry contributions and the instrumentation of mechanical systems in the industrial and scientific fields. This book is ideally designed for technicians, engineers, industry specialists, researchers, academicians, and students seeking current research on today’s execution of mobile robotic schemes.
Author: D. C. Paulson
Publisher:
ISBN:
Category :
Languages : en
Pages : 333
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Book Description
The program objective has been to provide the design of a space navigation system for unmanned earth satellites. The system is required to provide accurate determination of the ephemeris state and to be autonomous. The equations of motion of the satellite are integrated using a detailed model of the earth's gravitational field. The effects of residual errors in the gravity field, unmodeled forces, and uncertainties in initial conditions are reduced by measurements. The selected approach employs two down sensors to track unidentified earth landmarks surface; this unknown tracking method obtains to line of sight angular velocity (V/h). The Phase I objective was to design and test an engineering model down sensor, a strapdown telescope. The measurement is obtained by digital correlation of signals from photodetector arrays in its image plane.
Author:
Publisher:
ISBN:
Category : Electronics in navigation
Languages : en
Pages : 552
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Book Description
Author: United States. Congress Senate
Publisher:
ISBN:
Category :
Languages : en
Pages : 2482
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Book Description
