The comptonization parameter from simulations of single-frequency,
  single-dish, dual-beam, cm-wave observations of galaxy clusters and
  mitigating CMB confusion using the Planck sky survey
  Systematic effects in dual-beam, differential, radio observations of extended
objects are discussed in the context of the One Centimeter Receiver Array
(OCRA). We use simulated samples of Sunyaev-Zel'dovich (SZ) galaxy clusters at
low ($z<0.4$) and intermediate ($0.4<z<1.0$) redshifts to study the
implications of operating at a single frequency (30 GHz) on the accuracy of
extracting SZ flux densities and of reconstructing comptonization parameters
with OCRA. We analyze dependences on cluster mass, redshift, observation
strategy, and telescope pointing accuracy. Using $Planck$ data to make primary
cosmic microwave background (CMB) templates, we test the feasibility of
mitigating CMB confusion effects in observations of SZ profiles at angular
scales larger than the separation of the receiver beams.
