On Framework Sites Selection for Unite-Processing of IGS CORS and Domestic CORS

Based on five years observed data of national and international GPS CORS,the six principles of framework sites selection for unite-processing of IGS CORS and domestic CORS are put forward,which are continuity principle,stability principle,high precision principle,mutil-solution principle,balance principle,and precision coherence principle.At last the IGS framework sites are selected via these six principles.