Airborne Sonar
Motivation
High-resolution imaging and mapping of the ocean and its floor has been limited to less than 5% of the global waters due to technological barriers. Whereas sonar is the primary contributor to existing underwater imagery, the water-based system is limited in spatial coverage due to its low imaging throughput. On the other hand, aerial synthetic aperture radar systems have provided high-resolution imaging of the entire earth’s landscapes but are incapable of deep penetration into water.
How can we get the best of both worlds?

Experimental Setup
1) Laser fires a burst of infrared light
2) Light is intensity modulated with the desired acoustic frequency
3) A mirror deflects the light down toward the water surface
4) Light is absorbed by the water and sound waves are created that reflect off underwater object
5) Sound is received in air and converted to an electrical signal by a high-sensitivity sensor
6) Signals are digitized and then stored in a local computer
7) Linear stage moves the sensor to mimic measurement with an array of sensors
3-D Reconstructed Image
After the signals are collected, we run an image reconstruction algorithm to convert the signals to a perceptible image:


Project News
Project Leads

WILLIAM MENG received the B.S. in Electrical Engineering from Columbia University in 2020, and is currently working toward the Ph.D. degree at Stanford University.
His current research interests include multi-modal imaging systems and computational imaging algorithms.
Project Founders

AIDAN FITZPATRICK received the B.S. degree in electrical and computer engineering from the University of Massachusetts Amherst, in 2018, the M.S. degree in electrical engineering from Stanford University in 2020, and the Ph.D. degree in electrical engineering from Stanford University in 2024.
His current research interests are in computational imaging - specifically at the intersection of electromagnetics, acoustics, and signal processing for the codesign of imaging algorithms and system hardware for non-contact thermoacoustic/photoacoustic, and millimeter wave applications.
Project Sponsors
