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Spectrum Compensation for Time-Reversal Method on Ultrasonic Target Detection Using Pulse Compression.
- Source :
-
IEEE Transactions on Ultrasonics Ferroelectrics & Frequency Control . Dec2017, Vol. 64 Issue 12, p1874-1883. 10p. - Publication Year :
- 2017
-
Abstract
- This paper discusses a method of time reversal (TR) for target detection using a signal with a higher signal-to-noise ratio (SNR) and higher resolution. To acquire a signal with a higher SNR and broader spectrum, we have proposed a sensitivity-compensated (SC) signal. In this paper, we propose three types of SC-for-TR signals. An SC-amplitude-modulated (AM)-for-TR signal and an SC-frequency-modulated (FM)-for-TR signal are calculated using squared spectrum compensation. Moreover, to enhance the transmitting energy of a time-reversed wave for a higher SNR, we propose an SC-amplitude-and-frequency-modulated-for-TR (SCAFM-for-TR) signal. The SCAFM-for-TR signal is calculated by AM and FM for deriving a TR wave with a constant envelope waveform and compensated spectrum. In this paper, the efficiency of the SC-for-TR signals is investigated on target ranging in water using pulse compression. Accordingly, the SC-for-TR signals derive a pulse compressed signal with a higher resolution. In addition, the precision of target ranging using the SCAFM-for-TR signal is greater than that using the other SC-for-TR signals at an arrangement when a target was fixed at a position where a signal with a lower SNR is received. These results show that the measurements using the SC-for-TR signals improve time resolution and the SNR. [ABSTRACT FROM PUBLISHER]
Details
- Language :
- English
- ISSN :
- 08853010
- Volume :
- 64
- Issue :
- 12
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Ultrasonics Ferroelectrics & Frequency Control
- Publication Type :
- Academic Journal
- Accession number :
- 126585420
- Full Text :
- https://doi.org/10.1109/TUFFC.2017.2748968