X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=blobdiff_plain;f=doc%2Ftelegps-system-operation.inc;fp=doc%2Ftelegps-system-operation.inc;h=40ab467ca736122835da9e2bb9a10c064a5cc1cc;hp=e8790db82bac9370044cce3789ce2cafdb9b726a;hb=4c1206a47431c7d873228fdd7328e1b9ac93a390;hpb=ef2ba847ca53a8ddfcddd4e51a0dd43c45161c85 diff --git a/doc/telegps-system-operation.inc b/doc/telegps-system-operation.inc index e8790db8..40ab467c 100644 --- a/doc/telegps-system-operation.inc +++ b/doc/telegps-system-operation.inc @@ -19,131 +19,13 @@ ground with our 10mW units and over 100k feet AGL with the 40mW devices. - === APRS - - TeleGPS can send APRS if desired, and the interval - between APRS packets can be configured. As each APRS - packet takes a full second to transmit, we recommend - an interval of at least 5 seconds to avoid consuming - too much battery power or radio channel bandwidth. You - can configure the APRS interval; that - process is described in the Configure TeleGPS - section of the TeleGPS Application chapter. - - AltOS uses the APRS compressed position report data - format, which provides for higher position precision - and shorter packets than the original APRS format. It - also includes altitude data, which is invaluable when - tracking rockets. We haven't found a receiver which - doesn't handle compressed positions, but it's just - possible that you have one, so if you have an older - device that can receive the raw packets but isn't - displaying position information, it's possible that - this is the cause. - - The APRS packet format includes a comment field that - can have arbitrary text in it. AltOS uses this to send - status information about the flight computer. It sends - four fields as shown in the following table. - - .TeleGPS APRS Comments - [options="header",cols="1,1,3"] - |==== - |Field |Example |Description - - |1 - |L - |GPS Status U for unlocked, L for locked - - |2 - |6 - |Number of Satellites in View - - |3 - |B4.0 - |Altimeter Battery Voltage - - |4 - |1286 - |Device Serial Number - |==== - - Here's an example of an APRS comment showing GPS lock with 6 - satellites in view and a battery at 4.0V from device 1286. - - .... - L6 B4.0 1286 - .... - - Make sure your battery is above 3.8V GPS is locked - with at least 5 or 6 satellites in view before - flying. If GPS is switching between L and U regularly, - then it doesn't have a good lock and you should wait - until it becomes stable. - - If the GPS receiver loses lock, the APRS data - transmitted will contain the last position for which - GPS lock was available. You can tell that this has - happened by noticing that the GPS status character - switches from 'L' to 'U'. Before GPS has locked, APRS - will transmit zero for latitude, longitude and - altitude. + :aprsdevices: TeleGPS + :configure_section: _configure_device + include::aprs-operation.raw[] === Configurable Parameters Configuring TeleGPS is very simple; the few configurable parameters can all be set using the TeleGPS application over USB. Read - the Configure TeleGPS section in the TeleGPS Software chapter below - for more information. - - ==== Radio Frequency - - Altus Metrum boards support radio frequencies in the 70cm - band. By default, the configuration interface provides a - list of 10 “standard” frequencies in 100kHz channels starting at - 434.550MHz. However, the firmware supports use of - any 50kHz multiple within the 70cm band. At any given - launch, we highly recommend coordinating when and by whom each - frequency will be used to avoid interference. And of course, both - TeleGPS and the receiver must be configured to the same - frequency to successfully communicate with each other. - - ==== Callsign - - This sets the callsign used for telemetry and APRS to - identify the device. - - ==== Telemetry/RDF/APRS Enable - - You can completely disable the radio, if necessary, leaving - TeleGPS only logging data to internal memory. - - ==== APRS Interval - - This selects how often APRS packets are transmitted. Set - this to zero to disable APRS without also disabling the - regular telemetry and RDF transmissions. As APRS takes a - full second to transmit a single position report, we - recommend sending packets no more than once every 5 seconds. - - ==== Maximum Flight Log - - Changing this value will set the maximum amount of flight - log storage that an individual flight will use. The - available storage is divided into as many flights of the - specified size as can fit in the available space. You can - download and erase individual flight logs. If you fill up - the available storage, future flights will not get logged - until you erase some of the stored ones. - - ==== Logging Trigger Motion - - If TeleGPS moves less than this distance over a long period - of time, it will not log that location, saving storage space. - - ==== Position Reporting Interval - - This sets how often TeleGPS reports position information via - telemetry and to the on-board log. Reducing this value will - save power and logging memory consumption. + the Configure TeleGPS section in the TeleGPS Software chapter