We propose a computer-efficient and accurate method of estimation ofspatially correlated errors in astrometric positions, parallaxes and propermotions obtained by space and ground-based astrometry missions. In our method,the simulated observational equations are set up and solved for thecoefficients of scalar and vector spherical harmonics representing the outputerrors, rather than for individual objects in the output catalog. Bothaccidental and systematic correlated errors of astrometric parameters can beaccurately estimated. The method is demonstrated on the example of the JMAPSmission, but can be used for other projects of space astrometry, such as SIM orJASMINE.
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