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Experimental assessments for a pillar-coupled electric benchmark platform at anchor are reported, which made on a test platform. Development of a geodetic platform at the center of flooded calderas have been highly demanded to improve the monitoring of the Aira Caldera. If geodetic observation in the center of the caldera is available, accuracy of the monitoring can be improved significantly. GNSS on the universal-coupled pillar at anchor is applied as a fundamental architecture of the platform. The design of the actual platform includes following four problems to be examined ; 1) year-long stability of Kinematic method, 2) optimum tilt detection method, 3) velocity responses, and 4) construction of tilt correction algorithm. Test of these all problems were successful and GNSS antenna array system is decided to apply the actual platform.