Differences

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--- projects:apex-ii [2010/11/22 08:26] – [Imaging Subsystem] jonsowman
+++ projects:apex-ii [2011/10/25 20:45] (current) – priyesh
@@ Line 1: / Line 1: @@
 ====== Project Apex II ======
+{{:projects:apex-ii-logo-640.jpg|}}
 Following in the footsteps of Apex I and its unfortunate loss, Version 2 of the high altitude weather balloon launched by Sutton Grammar School sets out to achieve the same objectives. With a completely redesigned payload and tracking system, we hope to make this version easier to track & find.
@@ Line 10: / Line 12: @@
 ===== Project Details =====
-This project is complete - the payload has been launched once and more launches are planned. See [[http://twitter.com/apex_ii|Apex II on Twitter]] for more information.
+This project is complete - the payload has been launched once and more launches are planned. See [[http://twitter.com/apexhab|ApexHAB on Twitter]] for more information.
-We have a PDF detailing the technical hardware on the payload. This can be found [[http://balloon.hexoc.com/media/apextech.pdf|here]].
+We have a PDF detailing the technical hardware on the payload. This can be found [[http://www.apexhab.org/wp-content/uploads/2011/01/apextech.pdf|here]].
-Contact us: send an email to our mailing list at [[project-apex@googlegroups.com|project-apex@googlegroups.com]]
+Contact us: send an email to our mailing list at [[team@apexhab.org|team@apexhab.org]]
+{{:projects:apexiips.jpg|}}{{:projects:small_apex-ii-launch4.jpg|}}{{:projects:small_apex-ii-launch1.jpg|}}{{:projects:small_apex-ii-r6.jpg|}}
+{{:projects:track-mp.png|}}
 ===== Payload Hardware =====
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 Radiometrix appnotes seem to suggest that bit balancing is very important with these modules and tone based operation gets around this issue to an extent. The other option is using a proper **bipolar encoder**.
+During Launch 1 we suffered difficulties in decoding due to the combined effect of severe temperature drift and the AFC in dl-fldigi losing track due to the extended radio-off period for uplink. For Launch 2, we will be addressing these issues by using a new transmission regime. We will transmit a packet on 300 baud three times over without radio breaks, just a ~3second carrier gap. Then will come a 50 baud packet with //only// GPS data (no sensor data), after which will be a ~20second uplink window.
 ==== GPS ====
@@ Line 85: / Line 92: @@
 We'll be using the standard AM-SSB capable radio and dl-fldigi to decode the incoming signals from the balloon. It's after that that things get a little more complex.
-We would like to be able to visually plot the balloon's position on a map without relying on an internet connection. As such we aim to write software to take data from fldigi and output it to the tracking system we used on Apex I as this worked brilliantly. The data will be fed to APRSPoint and then Mappoint 2004 so we can see the balloon's position on the Mappoint map.
+We would like to be able to visually plot the balloon's position on a map without relying on an internet connection. As such we aim to write software to take data from fldigi and output it to the tracking system we used on Apex I as this worked brilliantly. The data will be fed to APRSPoint and then MapPoint 2004 so we can see the balloon's position on the Mappoint map.
 We will have a 3G internet dongle in at least one of the vehicles so decoded data from the radios can be fed to the DL server. Provided we have internet connectivity we can also use the DL tracking web page to see balloon position, altitude, ascent rates, etc. However we aim to implement all this functionality locally so as to not rely on net connection.
-The software is called "Apex Packet Handler" and is written in C#.
+The software is called "Apex Packet Handler" and is written in VB.
 ===== Team =====
@@ Line 101: / Line 108: @@
   * Andrew Cowan
   * Richard Morris
+  * Dominic Branford
+  * Priyesh Patel
+  * Philip Warren
+  * Alex Landless
+  * Edward Branford
+  * Michael Woodgate
 === Staff ===