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LANDSAT-4 horizon scanner performance evaluationRepresentative data spans covering a little more than a year since the LANDSAT-4 launch were analyzed to evaluate the flight performance of the satellite's horizon scanner. High frequency noise was filtered out by 128-point averaging. The effects of Earth oblateness and spacecraft altitude variations are modeled, and residual systematic errors are analyzed. A model for the predicted radiance effects is compared with the flight data and deficiencies in the radiance effects modeling are noted. Correction coefficients are provided for a finite Fourier series representation of the systematic errors in the data. Analysis of the seasonal dependence of the coefficients indicates the effects of some early mission problems with the reference attitudes which were computed by the onboard computer using star trackers and gyro data. The effects of sun and moon interference, unexplained anomalies in the data, and sensor noise characteristics and their power spectrum are described. The variability of full orbit data averages is shown. Plots of the sensor data for all the available data spans are included.
Document ID
19840008558
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Bilanow, S. (General Software Corp. Landover, MD, United States)
Chen, L. C. (General Software Corp. Landover, MD, United States)
Davis, W. M. (General Software Corp. Landover, MD, United States)
Stanley, J. P. (General Software Corp. Landover, MD, United States)
Date Acquired
September 4, 2013
Publication Date
January 1, 1984
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
NAS 1.26:173229
E84-10079
NASA-CR-173229
Accession Number
84N16626
Funding Number(s)
CONTRACT_GRANT: NAS5-17664
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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