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The Eigensystem realization algorithm -LRB- ERA -RRB- is a system identification technique popular in civil engineering , in particular in structural health monitoring .. system identification. system identification. civil engineering. civil engineering. structural health monitoring. structural health monitoring. ERA can be used as a modal analysis technique and generates a system realization using the time domain response -LRB- multi - -RRB- input and -LRB- multi - -RRB- output data .. modal analysis. modal analysis. system realization. system realization. The ERA was proposed by Juang and Pappa and has been used for system identification of aerospace structures such as the Galileo spacecraft , turbines , civil structures and many other type of systems .. system identification. system identification. Galileo spacecraft. Galileo spacecraft