Multi-mode ultrasonic operation using Golay complementary sequences and QPSK modulation2000
In many of the recent array ultrasonic applications, acquisition rate is a crucial issue. Many of those applications are even impractical due to the sequential nature of ultrasound systems scanning. Obviously, one way of increasing this rate is the use of multi-mode operation. This paper introduces the basic aspects of multi-mode ultrasonic operation, based on pulse compression techniques, by means of Golay complementary sequences. To take advantage of such sequences a QPSK modulation scheme is used so we transmit both complementary sequences simultaneously. Finally, some results using two modes simultaneously are shown.