An application on adding window technology in truncated long code ultrasound system

This work focuses on the internal mechanism of adding window technology and its application in the truncated long code ultrasound system. First, a simple introduction of the truncated long code is given in which the transmitted pulses are coded using different short codes from burst to burst, and all the echoes are organized together coherently in the later estimation process to form a long code modulation. When applying the method into the pulse-echo ultrasound system, the code selection is no longer a key issue and the penetration ability and axial resolution can be improved in the medical ultrasound system. However the precision of the spectrum analysis is not enhanced. To solve the problem of low spectrum analysis precision, in this paper we have studied the principle of the adding window technology and apply it to the truncated long code ultrasound system. Good results of the simulation about the application have been given. The simulation shows that the adding window technology improves the Doppler signal power spectrum out-of-band diffusion and effectively reduces spectrum leakage. It also improves the system performance and the precision of the spectrum analysis.