Flight predictor for UPRA high altitude ballon flights. Really WIP.
Currenty the program can be operated with the following commands:
Start a new flight with name <FLIGHTNAME>. After entering this command, you have to provide the default weather data to be used. (See test_input.txt for example.) The end of default weather data is marked by a . in a new line.
Balloon properies must be provided in the order they appear here
| Property | Description |
|---|---|
| BALLOON_DRY_MASS | Mass of empty balloon (kg) |
| PARACHUTE_DRY_MASS | Mass of parachute (kg) |
| PAYLOAD_DRY_MASS | Mass of payload (kg) |
| NECK_LIFT | Lift measured at the neck of the inflated balloon (kg) |
| PARACHUTE_AREA | Area of parachute (m^2) |
| PARACHUTE_DRAG_C | Parachute drag coefficient |
| BALLOON_DRAG_C | Balloon drag coefficient |
| DESIGN_BURST_DIAM | Design burst diameter of balloon (m) |
| LIFTING_GAS_MOLAR_MASS | Molar mass of the used lifting gas (eg. 0.004 for helium) |
Send a new packet to the predictor. Packet must use the UPRA packet format and be valid.
The data from the packet gets added to the recieved packet data of flight <FLIGHTNAME>, and the program computes wind data using the calulcated distance travelled from the last recieved location.
Currently we're using a 61 byte long UKHAS type package format without checksum for telemetry:
$$CCCCCCC,iii,hhmmss,(+/-)xxxx.xxx,(+/-)xxxxx.xxx,aaaaa,eeee,ooo,rrr,
Where:
| Packet field | Description |
|---|---|
| $$ | START bytes |
| CCCCCC | callsign |
| iii | Message ID |
| hhmmss | GPS time (UTC) (hh-hours, mm-minutes, ss-seconds) |
| (+/-)xxxx.xxxx | latitude (NMEA format) |
| (+/-)xxxxx.xxxx | longitude (NMEA format) |
| aaaaa | altitude (m) |
| eeee | external temperature (*10 °C -> eee.e°C) |
| ooo | OBC module temperature (*10 °C -> ooo°C) |
| rrr | COM module temperature (*10 °C -> rrr°C) |
Example:
$$HAxUPRA,022,082633,+4728.413,+01903.649,00131,0327,002,001,
Currently the predictior uses data from the fields GPS time, Lat, Lon, Alt. Usage of measured external temperature may get added soon.
Get ballon property <PROPNAME> of flight <FLIGHTNAME>.
Set ballon property <PROPNAME> of flight <FLIGHTNAME> to <VALUE>.
Make a new prediction. Currently the prediction gets returned in the following CSV-like way:
timestamp,latitude,longitude,altitude
Where:
| Output field | Description |
|---|---|
| timestamp | Time stamp in hhmmss format |
| latitude | Latitude in decimal degrees |
| longitude | Longitude in decimal degrees |
| altitude | Altitude in metres |
The end of prediction data is marked by a . in a new line.
Conclude flight <FLIGHTNAME>.