The evaluated signal-to-noise ratio for the alternate transmission of different chirp ultrasound to extend the measurable distance in the pulse-echo method

The basic concept of distance measurement using the alternate transmission of two different codes based on the pulse-echo method has been used to obtain an extension of the measurable distance, in which the temporal resolution is not degraded in the one-code transmission. In the alternate transmission, the reflected signals from the object are measured by two correlation signals. The received signal is correlated with each transmitted signal. The truncation and truncated interference noise of signals are generated in the cross-correlation function. Which is a part of the signal components. The signal components are changed according to the transmit signal. In this paper, the signal-to-noise ratio (SNR) of the alternate transmission of the different chirp signals is described and investigated. The highest SNR of the alternate chirp signal is achieved by the high bandwidth and long length of the transmitted signal. Moreover, the different bandwidth of the chirp transmission is simulated. The SNRs of the alternate transmission of different chip signals between the experiment and simulation are compared.