I have found several sources describing how to use Doppler velocimetry/anemometry to measure the Doppler shift with analog signals, but i cannot find much about using this method for digital signals such as Bluetooth. I was wondering if it were possible to use Doppler velocimetry/anemometry with digital signals? If so i was wondering if I could use it with the Bluetooth capabilities(2400 MHz – 2483.5 MHz) of an iPhone?
If your question is whether you could ever use the Bluetooth radio in an iPhone to perform doppler velocimetry, I'm going to go out on a limb here and say no.
Most mobile devices are incredibly modular. This means that the BT/WiFi radio (they are often combined into a single chip these days) is designed to handle all of the RF signal processing necessary, and then hand over only the digital data received, but never the analog signals. By the time the signal is turned into digital data, any effects of multipath, channel noise, doppler shift, and other analog phenomena has been removed. It is highly unlikely that any mass-produced cell phone would have access to the analog signal being received by the individual radios.