Last week, we actually verified all of our individual parts together and collected our first data traces. Results are promising, as we see increased accuracy from the higher clock speed of the ESP over the prototyping data we were using. No changes have been made to the system, but we’re considering working with a different infiltration method (RTS/CTS frames) if we can not get picoScenes measuring ack frames.
The biggest question mark for us is the clock drift in devices we saw occurring. This means that one of our wifi devices was taking longer and longer to respond to packets (due to overheating or clock slowdown), even if the distance between the RX/TX was the same. Our contingency plan for tackling this is using shorter windows, and possibly restricting the users movement to when we want them to. This would allow us to know when clock drift is occurring and when it is user movement causing an increase in ToF.