Greetings. We are interested in finding a way to log aircraft positions with a relatively accurate, GPS synchronized timestamp. We are only interested in aircraft flying through a 150 mile radius zone. It is important for us to be able to say “the aircraft was at position Z at time X (+/- Y ms)”. where X are Z are fairly accurate (actual value TDB) and Y is small. I’m thinking +/- 75 ms max. Note that I’m not as interested in the latency of receiving the data (how long it takes the data to travel through the internet), just having a close coupling between the aircraft position and timestamp is what matters.
Originally I started looking down the path of getting an ADS-B receiver, but I discovered that the ADS-B message that the aircrafts transmit does not have a timestamp. From what I understand, the GPS timestamp on most ADS-B receivers are timestamping when the receiver gets the ADS-B message. And since ADS-B messages are sent periodically every second, you can basically only say that the position data is only accurate to within a second.
So that brought me to this site, which looks like I can just receive flight information from the web. How accurate is the information? Could this site be used to meet our needs? If not, does anyone have any recommendations?