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We present a method for beam deconvolution for cosmic microwave background(CMB) anisotropy measurements. The code takes as input the time-ordered data,along with the corresponding detector pointings and known beam shapes, andproduces as output the harmonic a_Tlm, a_Elm, and a_Blm coefficients of theobserved sky. From these one can further construct temperature and Q and Upolarisation maps. The method is applicable to absolute CMB measurements withwide sky coverage, and is independent of the scanning strategy. We test thecode with extensive simulations, mimicking the resolution and data volume ofPlanck 30GHz and 70GHz channels, but with exaggerated beam asymmetry. We applyit to multipoles up to l=1700 and examine the results in both pixel space andharmonic space. We also test the method also in presence of white noise.

ArtDeco: A beam deconvolution code for absolute CMB measurements