A videogrammetric technique developed at NASA Langley Research Center has been used at five NASA facilities at the Langley and Ames Research Centers for deformation measurements on a number of sting mounted and semispan models. These include high-speed research and transport models tested over a wide range of aerodynamic conditions including subsonic, transonic, and supersonic regimes. The technique, based on digital photogrammetry, has been used to measure model attitude, deformation, and sting bending. In addition, the technique has been used to study model injection rate effects and to calibrate and validate methods for predicting static aeroelastic deformations of wind tunnel models. An effort is currently underway to develop an intelligent videogrammetric measurement system that will be both useful and usable in large production wind tunnels while providing accurate data in a robust and timely manner. Designed to encode a higher degree of knowledge through computer vision, the system features advanced pattern recognition techniques to improve automated location and identification of targets placed on the wind tunnel model to be used for aerodynamic measurements such as attitude and deformation. This paper will describe the development and strategy of the new intelligent system that was used in a recent test at a large transonic wind tunnel.
Alvah Moore, Michael Cisewski, Marilee Roell, John Rawls, Robert Veiga, Robert Borchardt, Sharon Graves, Arthur Hayhurst, Joseph Hickman, Sidney Holloway, Lemuel Mauldin, Robin Tutterow
The instrument description and ground test simulations of on- orbit scenarios for the Stratospheric Aerosol and Gas Experiment III (SAGE-III) are presented. SAGE-III is a spectrographic instrument that has been developed in the U.S. and will orbit aboard a Russian Meteor-3M spacecraft beginning Fall of 1999. It will orbit at a nominal altitude of 1020 km and inclination of 99.6 degrees for global coverage. The instrument will measure the attenuated solar and lunar radiation from 290 nm to 1550 nm wavelength range through the stratosphere. The radiant data are normalized to the non- attenuated radiation measured above the atmosphere during each occultation event. The data are used to calculate the vertical distribution of stratospheric aerosols, ozone and other species that are critical in studying trends and global change. After on-orbit operations being, the autonomy of the instrument will not need up-link commands to acquire science data or to transmit the data back to the United States and Russia.
An overview of joint Russian-American mission operations for the Meteor-3M/SAGE III mission is presented. The Russian Space Agency is responsible for the operation and sustaining engineering of the Meteor-3M spacecraft. The SAGE III mission operations center located at the NASA Langley Research Center is responsible for instrument operation, sustaining engineering, Level 0 data processing, and orbit determination. SAGE III science data is received at ground stations located at the NASA Wallops Flight Facility and in Russia using redundant, twice daily, data playbacks. The highly autonomous mission design requires a high degree of payload autonomy. A combination of navigation data provided by the spacecraft's GPS/GLONASS receiver and novel on-board event scheduling software is used to schedule routine occultation measurements without the need for ground commanding.
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