X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=doc%2Faltusmetrum.xsl;h=f91ac191f72a5897fd14d500226b17c4c6b41bcf;hb=8e7b8b0533e03e89425296d464b7a1a26fb63686;hp=ae10afe951956ca315c5783b006f9c8fc7a7c1d8;hpb=7df221c42948cb42cf777b899263c8ec9067bd55;p=fw%2Faltos
diff --git a/doc/altusmetrum.xsl b/doc/altusmetrum.xsl
index ae10afe9..f91ac191 100644
--- a/doc/altusmetrum.xsl
+++ b/doc/altusmetrum.xsl
@@ -25,6 +25,11 @@
2014
Bdale Garbee and Keith Packard
+
+
+
+
+
This document is released under the terms of the
@@ -1534,10 +1539,13 @@ NAR #88757, TRA #12200
first five seconds of operation.
- At power on, you will hear three beeps or see three flashes
- (âSâ in Morse code for start up) and then a pause while
- the altimeter completes initialization and self test, and decides
- which mode to enter next.
+ At power on, the altimeter will beep out the battery voltage
+ to the nearest tenth of a volt. Each digit is represented by
+ a sequence of short âditâ beeps, with a pause between
+ digits. A zero digit is represented with one long âdahâ
+ beep. Then there will be a short pause while the altimeter
+ completes initialization and self test, and decides which mode
+ to enter next.
Here's a short summary of all of the modes and the beeping (or
@@ -1565,7 +1573,7 @@ NAR #88757, TRA #12200
Startup
S
- dit dit dit
+ battery voltage in decivolts
Calibrating sensors, detecting orientation.
@@ -2004,22 +2012,112 @@ NAR #88757, TRA #12200
time, and would of course appreciate customer feedback on
performance in higher altitude flights!
+
+
+ APRS
TeleMetrum v2.0 and TeleMega 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.
+ battery power or radio channel bandwidth. You can configure
+ the APRS interval using AltosUI; that process is described in
+ the Configure Altimeter section of the AltosUI 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.
+
+
+ Altus Metrum APRS Comments
+
+
+
+
+
+
+
+ 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
+ A3.7
+ Apogee Igniter Voltage
+
+
+ 5
+ M3.7
+ Main Igniter Voltage
+
+
+
+
+
+ Here's an example of an APRS comment showing GPS lock with 6
+ satellites in view, a primary battery at 4.0V, and
+ apogee and main igniters both at 3.7V.
+
+ L6 B4.0 A3.7 M3.7
+
+
+
+ Make sure your primary battery is above 3.8V, any connected
+ igniters are above 3.5V and 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.
Configurable Parameters
Configuring an Altus Metrum altimeter for flight is very
- simple. Even on our baro-only TeleMini and EasyMini boards, the use of a Kalman
- filter means there is no need to set a âmach delayâ. The few
- configurable parameters can all be set using AltosUI over USB or
- or radio link via TeleDongle.
+ simple. Even on our baro-only TeleMini and EasyMini boards,
+ the use of a Kalman filter means there is no need to set a
+ âmach delayâ. The few configurable parameters can all be set
+ using AltosUI over USB or or radio link via TeleDongle. Read
+ the Configure Altimeter section in the AltosUI chapter below
+ for more information.
Radio Frequency
@@ -2035,6 +2133,35 @@ NAR #88757, TRA #12200
frequency to successfully communicate with each other.
+
+ Callsign
+
+ This sets the callsign used for telemetry, APRS and the
+ packet link. For telemetry and APRS, this is used to
+ identify the device. For the packet link, the callsign must
+ match that configured in AltosUI or the link will not
+ work. This is to prevent accidental configuration of another
+ Altus Metrum flight computer operating on the same frequency nearby.
+
+
+
+ Telemetry/RDF/APRS Enable
+
+ You can completely disable the radio while in flight, if
+ necessary. This doesn't disable the packet link in idle
+ mode.
+
+
+
+ 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.
+
+
Apogee Delay
@@ -2056,6 +2183,20 @@ NAR #88757, TRA #12200
way quite happily, including Keith's successful L3 cert.
+
+ Apogee Lockout
+
+ Apogee lockout is the number of seconds after boost where
+ the flight computer will not fire the apogee charge, even if
+ the rocket appears to be at apogee. This is often called
+ 'Mach Delay', as it is intended to prevent a flight computer
+ from unintentionally firing apogee charges due to the pressure
+ spike that occurrs across a mach transition. Altus Metrum
+ flight computers include a Kalman filter which is not fooled
+ by this sharp pressure increase, and so this setting should
+ be left at the default value of zero to disable it.
+
+
Main Deployment Altitude
@@ -5003,7 +5144,8 @@ NAR #88757, TRA #12200
-
+
@@ -5017,7 +5159,8 @@ NAR #88757, TRA #12200
-
+
@@ -5031,7 +5174,8 @@ NAR #88757, TRA #12200
-
+
@@ -5045,7 +5189,8 @@ NAR #88757, TRA #12200
-
+
@@ -5153,6 +5298,13 @@ NAR #88757, TRA #12200
Release Notes
+
+ Version 1.4
+
+
Version 1.3.2