Abstract
We have studied high resolution pulse compression technique for ultrasonic pulse-echo measurement. To acquire broader and flatter spectrum, a Sensitivity Compensate Transmitting (SCT) signal was proposed. The SCT signal is calculated from inversed filtering of received signal. Here, two types SCT signal are proposed. As a Sensitivity Compensated AM (SCAM) signal, an amplitude modulated chirp wave is proposed. Furthermore, for higher Signal to Noise Ratio (SNR), a non-linear FM signal is proposed as a Sensitivity Compensate FM (SCFM) signal. In this paper, effectiveness of the SCT signal on 2-D direction measurement is discussed. By using the SCT signal, the time resolution of compressed pulse is improved, and accuracies of direction measurement using the SCT signal are improved than that of using the chirp wave. Furthermore, by using the SCFM signal, accuracy of direction measurement is improved than that of using the SCAM signal when the target is located at the position where the SNR of received signal is lower.
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