search

project-bluebird / bluebird

Server to communicate with NATS air traffic simulator and Bluesky
MIT License
10 stars 4 forks source link

Ground speed reporting bug? #71

Open thobson88 opened 4 years ago

thobson88 commented 4 years ago

I just noticed a possible bug in the reporting of ground speed in the POS endpoint.

If I create an aircraft with the following parameters:

"acid": "TST001", "type": "B744", "lat": "0", "lon": "0", "hdg": "0", "alt": "FL360", "spd": "250"

and then request position I get something like:

"TST001": { "actype": "B744", "alt": 10972, "gs": 232, "lat": 0.0479, "lon": 0, "vs": 0 }, "sim_t": 23

but using the POS command in the BlueSky client returns these speeds:

TAS/CAS/GS: 262/453/453 kts M: 0.789

So there's a big discrepancy in the ground speed figures. I also noticed that Bluebird reports a fixed ground speed of around 232 when the aircraft speed is changing in the client, so it almost looks like there's an upper bound on ground speed reported by Bluebird.

rkm commented 4 years ago

Looks like BS reports the CAS/TAS/GS in m/s but converts them to kts for display in the GUI. I've corrected the API documentation to reflect that the ground speed is in m/s.

I'm not sure I can currently reproduce the situation where the ground speed reaches an upper bound. Do you have a scenario or a log file you could send me which shows this? Thanks.