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Telemetry
Telemetry is a data report provided by the NSRV computer that shows the
current operational status and location. The NSRV provides one of three
types of telemetry data at a rate of one every twenty (20) seconds. NOTE:
The telemetry messages are subject to change. The latest information
will be posted to this website the night before a scheduled flight. The messages 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
a typical status message and its data elements.
>NSRV 03:01:46 70183'
-480'/min 45kts 0.7pdop 8.4v 22.2F -15.2F
| Telemetry |
Description |
| > |
Standard
AX.25 symbol to indicate this is an APRS status message. |
| NSRV |
Mission
identification string. |
| 02:04:46 |
Flight
time in hours, minutes, and seconds. This flight has been
aloft 2 hours, 4 minutes, and 46 seconds. |
| 70183' |
Current
altitude in feet. |
| -480'/min |
Current
vertical speed in feet / minute. |
| 45 kts |
Current air speed in
knots. |
| 0.7hdop |
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. |
| 8.4v |
Payload
computer power bus in volts DC. |
| 22.2F |
Internal
payload computer temperature in degrees Fahrenheit. |
| -15.2F |
External
temperature in degrees Fahrenheit. |
NMEA-0183 $GPGGA navigation message.
NMEA-0183 $GPRMC navigation
message.
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