We present a depth-dependent mismatched-filter pulse compression technique which improves range resolution and dynamic range of coded excitation ultrasonic imaging compared to a matched-filter pulse compression. After choosing a used to design the appropriate mismatched filter depthsuitable magnitude spectrum, frequency weighting is dependently, which allows to control mainlobe width and sidelobe characteristics. Both simulations and measurements are used to demonstrate the efficacy of the technique. A VLSI implementation of a depthdependent mismatched filter is shown to be feasible.
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