Investigation of the resolution enhancement achieved by MIMO Sonar systems
* Presenting author
An active Sonar system is a device which uses acoustical waves to detect and locate objects by using the echo principle. It transmits acoustical waves and receives the echo signals reflected from objects, where the receiver often consists of an array with several receiver elements (Single-Input Multi-Output), followed by a conventional time delay beamformer. A Multi-Input Multi-Output (MIMO) Sonar has more than one transmitter and can transmit multiple probing signals that may be correlated or uncorrelated with each other. In the processing of the received signals, which are the superposition of the reflections of these transmitted probing signals, those probing signals can be separated from each other. This technique offers new perspectives for target detection and resolution compared to conventional time delay beamforming. This paper addresses the simulation and testing of a MIMO Sonar which uses probing signals within the same frequency band to demonstrate its enhanced resolution capabilities. The simulation includes the signal generation of the probing signals, a three dimensional model of the scenario which can arbitrary be chosen and the post signal processing. The test is a laboratory experiment with two transmitters and an array of microphones as receiver on audible airborne sound.