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We want to set up ad data server giving us various satellite data on OSC.

One possible method is using predict in server mode, fetching data with a script and broadcasting data in the form of OSC messages.

We are implementing this on the esc server.

- predict: http://www.qsl.net/kd2bd/predict.html is to be launched in "server mode" with "predict -s". TODO: using a cron job, update the TLE data frequently, see man predict:

wget -qr www.celestrak.com/NORAD/elements/amateur.txt -O amateur.txt
wget -qr www.celestrak.com/NORAD/elements/visual.txt -O visual.txt
wget -qr www.celestrak.com/NORAD/elements/weather.txt -O weather.txt
/usr/local/bin/predict -u amateur.txt visual.txt weather.txt

For general information:

  • ========================= PREDICT's Socket Commands =========================


PREDICT Socket Command Summary ============================== The following are the socket commands interpreted by PREDICT when the program is running in either the single satellite or multi-satellite tracking mode:

Command: GET_SAT Argument: satellite name or object number Purpose: To poll PREDICT for live tracking data. Return value: Newline ('\n') delimited string of tracking data. Example: GET_SAT ECHO Data returned:

ECHO 151.79 -70.04 203.75 -60.01 1126395990 5988.49 11881.33 773.71 7.47 6292 D 279.37 -32.42 360.00

Description: The values are identified by the order in which they are returned. Referring to the example above,

Name: ECHO Long: 151.79 (degrees West) Lat: -70.04 (degrees North) Az: 203.75 (degrees) El: -60.01 (degrees) Next AOS/LOS: 1126395990 (seconds since 01-Jan-1970)=Sat Sep 10 23:46:30 2005 Footprint: 5988.49 (kilometers) Range: 11881.33 (kilometers) Altitude: 773.71 (kilometers) Velocity: 7.47 (kilometers/hour) Orbit Number: 6292 (revolutions) Visibility: D (see below) Orbital Phase: 279.37 (degrees) Eclipse Depth: -32.42 (degrees) Squint: 360.00 (degrees, or 360.0 if squint is not applicable)

If the satellite is in either a geostationary orbit or an orbit that does not permit AOS to occur at the groundstation, a zero (0) is returned for the next AOS/LOS time. Otherwise, the next AOS time is provided for satellites not currently in range of the ground station. If the satellite is in range, then the LOS time is provided.

The name provided as an argument to GET_SAT must match the full length name contained in PREDICT's orbital database, and may contain spaces. The command string passed to PREDICT must end with an end of line ('\n') character. The satellite's object number may be used in lieu of the satellite name.

The visibility codes returned are the same as those displayed in PREDICT's multi-satellite tracking mode. An 'N' indicates the satellite is not in sunlight, nor is it optically visible at the ground station. A 'D' indicates that the satellite is in sunlight, but not optically visible at the ground station. A 'V' indicates the satellite is in sunlight, while the ground station is in darkness, meaning the satellite may be optically visible at the ground station.

If the satellite has decayed, the Next AOS/LOS time will be reported as 0. All other values will also be set to zero. The visibility code will be set to 'N'.

tune transmitters and receivers in prior to the time of AOS.

sat: SatelliteDataServer (last edited 2011-08-24 12:25:32 by NorbertMath)