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Telemetry Telemetry is a data report provided by the
Payload Computer that shows the
current operational status and location. The Payload Computer provides one of three
types of telemetry data at a regular rate, typically every 15-20 seconds.
NOTE: The telemetry rates are subject to change based on the other
payload that are flying. The telemetry include the following:
 Plain
text status message. The plain text status messages contains flight time,
altitude, bus voltage, GPS status, and internal temperature. The following is
an actual flight status message and its data elements.
>ANSR 01:39:08 94386'
1031'/min 1.1pdop 8.4V 32.2F 34.5F -1.5F
| Telemetry |
Description |
| > |
Standard
AX.25 symbol to indicate this is an APRS status message. |
|
ANSR |
Standard project identifier.
ANSR - Arizona Near Space Research |
|
01:39:08 |
Flight
time in hours, minutes, and seconds. This flight has been
aloft 1 hour, 39 minutes, and 8 seconds. |
| 94386' |
Current
altitude in feet. |
|
1031'/min |
Ascent/descent rate in feet per
minute where a positive number represents an ascent. |
|
1.1pdop |
GPS
Horizontal Dilution of Position. HDOP/PDOP is used to determine the accuracy
of the current GPS solution. An HDOP/PDOP of 3.0 or less indicates
the GPS accuracy is very good. The HDOP/PDOP is provided in the
telemetry string to determine what happens if the payload is
tumbling after a balloon burst or if the package lands in an unusual
attitude.
If the units suffix 'hdop' is shown, the GPS fix is provided in 2D
(no altitude) mode.
If the unit suffix 'pdop' is shown, the GPS fix is provided in 3D
(altitude) mode. |
| +8.4v |
Battery voltage in DC volts. |
| 32.2F |
Internal
payload computer temperature in degrees Fahrenheit. |
| 34.5F |
Radio base plate temperature in degrees Fahrenheit. |
| -1.5F |
External temperature in degrees Fahrenheit. |
NMEA-0183 $GPGGA
(GPS Fix data) navigation message that provides location and altitude
information.
NMEA-0183 $GPRMC
(Recommended Minimum Specific GPS/Transmit data) navigation message that
provides location and course/speed information.
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