Spectrum Compensation for Time-Reversal Method on Ultrasonic Target Detection Using Pulse Compression

Area of Science:

• Acoustics
• Signal Processing
• Underwater Target Detection

Background:

• Time reversal (TR) is crucial for target detection.
• Achieving higher signal-to-noise ratio (SNR) and resolution is a key challenge.
• Existing methods may not optimize spectral characteristics for TR.

Purpose of the Study:

• To propose novel sensitivity-compensated (SC) signals for time reversal (TR).
• To enhance SNR and resolution in underwater target detection.
• To evaluate the performance of different SC-for-TR signal types.

Main Methods:

• Development of three SC-for-TR signal types: SC-AM-for-TR, SC-FM-for-TR, and SCAFM-for-TR.
• Utilizing squared spectrum compensation for signal generation.
• Investigating signal efficiency using pulse compression for target ranging in water.

Main Results:

• SC-for-TR signals successfully improve time resolution and SNR.
• The SC-amplitude-and-frequency-modulated-for-TR (SCAFM-for-TR) signal demonstrates superior target ranging precision.
• SCAFM-for-TR achieves better performance in low SNR conditions.

Conclusions:

• SC-for-TR signals offer significant improvements in underwater target detection.
• The SCAFM-for-TR signal is particularly effective for precise target ranging.
• These findings advance TR techniques for enhanced acoustic sensing.