Abstract
The COBE Differential Microwave Radiometer (DMR) experiment will measure the anisotropy of the cosmic microwave background radiation (CMBR). The initial phase of data analysis uses a ‘sparse matrix’ algorithm to convert the differential temperature data into sky maps. The sky maps are then fitted to a ‘fast’ multipole expansion in spherical harmonics. Since the CMBR anisotropy is very weak, powerful techniques are used to extract the angular unevenness of the sky from the low signal-to-noise data. Instrument signature and other systematic errors are subtracted by fitting models of these effects. Test results are presented.
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