What are the most significant risks that could jeopardize the success of the project?
The largest challenge so far is:
making the final decisions on the array shape and size, as many aspects of the system will be depend strongly on this. How are these risks being managed? What contingency plans are ready?
• Were any changes made to the existing design of the system (requirements, block diagram, system spec, etc)? Why was this change necessary, what costs does the change incur, and how will these costs be mitigated going forward?
We have the results of several simulations of different array geometries, sizes, and frequencies of interest. In all cases, they are attempting to image a scene with a single source at a specific frequency. Plots are 4 separate images of the same scene at different frequencies, but all other parameters are the same.
Randomly distributed microphones, showing slightly reduced artifacts, but at the cost of a higher, random noise floor over most of the image
Image form microphones randomly distributed through a volume, showing nearly identical performance to the random array
8*12 rectangular array images, showing better noise performance over most of the image than the random distribution, but with distinct, clearly visible artifacts.
Early, low-resolution simulation, showing that the concept is at least viable at these sizes/frequencies.
The 10KHz image in this series shows one of the issues with higher frequencies, an artifact is visible at the left of the image, while the source is slightly off center to the right. This artifact stays out of the field of view that we’re interested in (90 degrees), but will have to be considered in the final design.