The Algorithm for MODIS Wavelength On-Orbit Calibration Using the SRCA

Details The Algorithm for MODIS Wavelength On-Orbit Calibration Using the SRCA The Algorithm for MODIS Wavelength On-Orbit Calibration Using the SRCA

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998stin...9909390m&link_type=abstract

Technical Report, NASA Goddard Space Flight Center Greenbelt, MD United States

Computer Science

Imaging Spectrometers, Imaging Techniques, Monochromators, Radiometers, Calibrating, Algorithms, Spectroradiometers, Signal Processing, Silicon, Displacement

Scientific paper

The Spectro-Radiometric Calibration Assembly (SRCA) provides on-orbit spectral calibration of the MODerate resolution Imaging Spectroradiometer (MODIS) reflected solar bands and this paper describes how it is accomplished. The SRCA has two adjacent exit slits: 1) Main slit and 2) Calibration slit. The output from the main slit is measured by a reference silicon photo-diode (SIPD) and then passes through the MODIS. The output from the calibration slit passes through a piece of didymium transmission glass and then it is measured by a calibration SIPD. The centroids of the sharp spectral peaks of a didymium glass are utilized as wavelength standards. After normalization using the reference SIPD signal to eliminate the effects of the illuminating source spectra, the calibration SIPD establishes the relationship between the peaks of the didymium spectra and the grating angle; this is accomplished through the grating equation. In the grating equation the monochromator parameters, Beta (half angle between the incident and diffractive beams) and Thetaoff (offset angle of the grating motor) are determined by matching, in a least square sense, the known centroid wavelengths of the didymium peaks and the calculated centroid grating angles from the calibration SIPD signals for the peaks. A displacement between the calibration SIPD and the reference SIPD complicates the signal processing.

Affiliated with

Also associated with

No associations

Rating

The Algorithm for MODIS Wavelength On-Orbit Calibration Using the SRCA does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Algorithm for MODIS Wavelength On-Orbit Calibration Using the SRCA, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Algorithm for MODIS Wavelength On-Orbit Calibration Using the SRCA will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1615582