Acoustic Monitoring System
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Contents |
Information
More information on the Acoustic ENSBox system can be found at Distributed_Acoustic_Sensing.
- Internal battery lifetime running system is about 6-8 hours
- Running on an external 7.2 AH battery, lifetime of 23+ hours (experiment conducted with battery at least 80% charged). - Running on an external car-start unit, lifetime of 55 hours.
Successful Users!
Data from UCLA Biology recorded during testing at James Reserve. The source is a birdsong playing from a speaker at either "center" (marked) or "far" (which is about 20m outside the deployment). There is also a relatively loud and quiet source (antbird vs owl calls).
Directory of videos of bird localization. (mov files are quicktime, avi are msmpeg encoded)
A graphic showing the array deployment geometry and the source positions.
HOWTOs
How to run the system standalone
Rebuild the software distribution
Future/Ongoing Work
Current Prototype Work (aka hacking)
Experiments and Test Data
DOA Performance Testing
To test the performance of the DOA estimation using the acoustic array system, we ran two tests using the acoustic self-localization software and a special test setup. The details of the test setup are described in [], but the basic setup was to have a receiver array on a tripod in the center of a square area, with an emitter in one corner. A laser was used to point at the edge of the square area, to accurately measure the ground truth array angle. We then performed two experiments.
The data from these experiments is contained in these two files:
In the first experiment (file entries 7076-7585), we rotated the array through 360 deg of azimuth, with the source at 0 degrees zenith.
In the second (file entries 7586-8082), we set the array on its side and rotated it again through 360 degrees. Since the array was on its side, this made the signals appear to come from a variety of elevations. The source arrived from several ranges of 3D angle:
1. 270 deg azi, from 0 to -90 deg zen
2. 90 deg azi, from -90 to 90 deg zen
3. 270 deg azi, from 90 to 0 deg zen
To use gnuplot to see correspondence for azimuth and zenith angles using these files:
plot "asendlog.htm" using 2:3, "filtered.htm" using 2:4 plot "asendlog.htm" using 2:3, "filtered.htm" using 2:13
The errors in these results are likely the result of a non-optimal array configuration. We plan to improve the array configuration in the next version.
