Coded excitation with Nonlinear Frequency Modulation Carrier in Ultrasound Imaging System

Since signal-to-noise ratio and axial resolution are effective decision parameters in ultrasound imaging and ultrasonic testing system, we combined nonlinear frequency modulation and Barker code sequence to improve these parameters, thereby improving the effect and performance in the ultrasound imaging and ultrasonic testing system. The theoretical study on the signal generation and decoding has been presented and the cyst phantom simulation has been carried out. The theoretical analysis shows that the new code method can improve 8.46 dB in Contrast ratio compared to simple pulse signal. The simulation produced the similar results.