Hi. This is magnificent idea, and after first investigation i am sure that is definitely possible. The main question is precision. What is the degree of precision that the application is supposed to achieve? That said, if it is supposed to go to Apple Store, for general public, it needs not to be a scientific grade solution. I have already an idea how to calibrate it. Will do it for little money, it's an interesting challenge. But it will take a lot of time to do all research work....
Please consider my bid.
C/C++, IPhone, SOAP on iPhone, RDBMS, GUI, Apple referenced, Apple Store submitting, France based. Quick delivery, documentation, strong QA, configuration management etc...