NASA Technical Reports Server (NTRS) : Results pdf

NASA Technical Reports Server (NTRS) : Results

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During the summer of 1984 the Marshall Space Flight Center’s Airborne Doppler Lidar System (ADLS) made a series of wind measurements in the California Central Valley. This study quantifies the lidar beam angle errors and velocity errors through analysis of ground return signals. Line-of-sight elevation (LOSE) angle errors are under 1 deg. Apparent Doppler ground velocities, as large as 2m/s, are considerably less than in a previous flight experiment in 1981. No evidence was found of a Schuler resonance phenomenon common to inertial navigation systems (INS), however the aperiodic nature of the apparent velocities implies an error in the INS-derived ground speeds. Certain features and subtleties in the ground returns are explained in terms of atmospheric structure and characteristics of the ADLS hardware and software. Finally, least squares and low-pass filtering techniques are suggested for eliminating errors during post-processing

• Creator/s: NASA Technical Reports Server (NTRS
• Date: 1/1/1987
• Year: 1987
• Book Topics/Themes: NASA Technical Reports Server (NTRS), AIRBORNE EQUIPMENT, DOPPLER RADAR, ELEVATION ANGLE, ERROR ANALYSIS, LINE OF SIGHT, OPTICAL RADAR, WIND MEASUREMENT, ATMOSPHERIC EFFECTS, CALIFORNIA, FLIGHT TESTS, LASER DOPPLER VELOCIMETERS, Rothermel, Jeffry

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