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The time reversal wide band digital beam forming and calibration technique is briefly described. New techniques using the bore-sight probing RF signal alone to derive the time reversal FIR (Finite Impulse Response) filter set are discussed. In the digital beam forming simulation, a set of 50-tap FIR filters measured from a 16 channel of 1 to 8GHz tunable 500Mhz bandwidth front end digitized system is used as RF front end. The simulation results of the previous time reversal approach and new approaches are compared.