Acoustic Vector Sensors Notes SP2010

Team Members: Evan

PhD Supervisor: Satya, Murat

Faculty Supervisor: Arye Nehorai

Goals

Understanding the AVS response:

1. To compute the frequency response and identify the bandwidth with flat response in all the channels.
2. To study the effects of the equalizer on the velocity measurements.

Perform 3D real-time source location using the four AVS

1. Revise the GUI
2. Implement an efficient method for triangulation in 3D

Status

Week 1

This week we worked out minor bugs in code and got everything back to where we left off last semester. The echo problem is still present. We discussed different ways to fix this problem. The assumptions that we made for the Capon spectrum to work may not be accurate (far field vs. near field acoustic waves)

Week 2

We gathered data from an AVS and compared it to the data we generate from the simulated data. The simulated data has the different components of the sensor in phase while the actual collected data did not. We altered the simulation to make the waves out of phase and observed the same 'echo' effect that we experience in the real data. This may be the source of the echo in the real data. Next week we will try to find a way to get the real data in phase.

Week 3

This week we developed a MATLAB script to correct the phase difference in the data. On Wednesday we finished the script and tested it on our phase shifted simulation. The script worked and lessened the echo to roughly 1/4 the magnitude of the real peak. Some LabView bugs made it difficult to continue working with the program, but hopefully they will resolve themselves when we switch computers. Next week we will attempt to apply the script to the real data- hopefully it will remove the echo that we previously experienced.

Files

I'm having trouble uploading these now... I will try to put everything up here that we use for the experiment