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Showing 1 to 18 of 18 for “"angles Only"”.
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Autonomous orbital rendezvous using angles-only navigation
… must be accomplished through the use of angles-only measurements by developing various relative motion orbital trajectories. Chaser vehicle maneuvers designed to enhance the estimator's observability of the downrange distance to the target are considered. The target vehicle is assumed to …
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Spacecraft Trajectory Planning for Optimal Observability using Angles-Only Navigation
<p>This work leverages existing techniques in angles-only navigation to develop optimal range observability maneuvers and trajectory planning methods for spacecraft under constrained relative motion. The resulting contribution is a guidance method for impulsive rendezvous and proximity operations …
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Angles-only navigation technique for maneuver-free spacecraft proximity operations
The technique of angles-only navigation consists of a single surveyor making line-of-sight observations of a target to deduce a relative navigation state from a sequence of angle measurements. Historically, angles-only navigation has been impeded by a range ambiguity problem in its many …
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Limitations of Initial Orbit Determination Methods for Low Earth Orbit CubeSats with Short Arc Orbital Passes
<p>This thesis will focus on the performance of angles only initial orbit determi- nation (IOD) methods on observational data of low Earth orbit (LEO) CubeSats. Using data obtained by Lockheed Martin’s Space Object Tracking (SpOT) facil- ity, four methods: Gauss, Double-R, Gooding and Assumed …
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On-orbit satellite inspection : navigation and [Delta]v analysis
… 6 degree-of-freedom simulation. A detailed angles-only navigation analysis and [delta]v performance analysis of three different inspection trajectories are performed. The results of this analysis show the feasibility of angles-only rendezvous navigation and the over-all inspection satellite …
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Skymark selection algorithm for a space-based navigational concept
The angles-only navigational concept envisions using orbiting satellites and other space objects as a set of moving landmarks, or skymarks, to improve upon an observer's knowledge of its position in space. This is accomplished by taking line of sight, or angles-only, measurements from an observer …
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Implementation and lessons learned from the Texas Synchrophasor Network
… to predict grid stability and voltage phase angles. Only recently have equipment been available to actually measure phase angle at points hundreds of miles away. A few of these systems are presently operating in the US by electric grids including the Electric Reliability Council of Texas …
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The Feasibility and Application of Observing Small LEO Satellites with Amateur Telescopes
… of a satellite brightness prediction model, angles-only orbit determination including extended Kalman filtering, and temporal error growth in TLE-based orbit propagation. Further investigations include a preliminary optimization using MATLAB's fmincon function (informed by the previous …
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Image Classification and Initial Orbit Determination of Resident Space Objects (RSO)
… identification and Orbit Determination (OD). Angles-only Initial Orbit Determination (IOD) methods are often employed as a starting point to optimize the OD process. These advancements play a pivotal role in enhancing and contributing to SSA research.
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Geosynchronous satellite maneuver detection and orbit recovery using ground based optical tracking
… recover an accurate orbit. This study uses angles only ground based optical tracking to detect maneuvers and recover orbits for geosynchronous satellites. Using the Analytical Graphics Inc. Orbit Determination Tool Kit sequential estimation software, a sequential estimation filter was …
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Space Image Processing and Orbit Estimation Using Small Aperture Optical Systems
<p>Angles-only initial orbit determination (AIOD) methods have been used to find the orbit of satellites since the beginning of the Space Race. Given the ever increasing number of objects in orbit today, the need for accurate space situational awareness (SSA) data has never been greater. Small …
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State Omniscience for Cooperative Local Catalog Maintenance of Close Proximity Satellite Systems
… agents) within this neighborhood through onboard angles-only measurements and cooperative communication with the other agents. A central supervisor selects the target body for each agent, a local controller tracks the selected target body for each agent, and a local estimator coalesces both an …
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Initial Orbit Determination Error Analysis of Low-Earth Orbit Rocket Body Debris and Feasibility Study for Debris Cataloguing from One Optical Facility
… predicated on determining the effectiveness of angles-only initial orbit determination (IOD) methods when limited observational data is available for low-Earth orbit (LEO) rocket body debris. The analysis will be conducted with data obtained from Lockheed Martin Space’s Space Object Tracking …
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Using a Single inertial measurement unit to measure the knee flexion angle at touchdown in side cutting movements
Joint angles can be an important measure in investigating sport-related injuries as well as in rehabilitation studies. Even though previous researchers have investigated using inertial measurement units to calculate joint angles, only a few studies can be found that were conducted using a single …
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Optical Orbit Tracking and Estimation
<p>Angles-only initial orbit determination methods are currently limited in their use as they require some prior knowledge of where the observed object will be and when it will be there. This research aims to produce a viable method to automate this process so that objects whose trajectories are …
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Development and validation of an objective swine feet and leg conformation procedure using digital imagery
… one, as farm one was taken from the right side only whereas farm two had both left (average 4.2) and right (average 3.9) profile images. Additionally, 2.6 rear stance images were used for measurement per sow. A joint angle measuring system was devised to collect angle measurements on the knee, …