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<?xml version="1.0"?>
    <allpages gapcontinue="Reuse_of_urine" />
      <page pageid="1712" ns="0" title="Reception d&#039;images satellites">
          <rev contentformat="text/x-wiki" contentmodel="wikitext" xml:space="preserve">We would like to receive satellite images from the [ NOAA-18] satellite.

This is a well-documented process and the most difficult part seems to be to build an antenna. The usual way to proceed is to use an RTL-SDR USB dongle and a few available software to do the signal decoding.

Robin has available the following:
* Soft-rock SDR module (to [ assemble]).
* RTL-SDR USB dongle.

We would need to build the antenna.

== Tutorials ==

* [ Tuto1]
* [ Tuto2]: This one uses a softrock SDR board.

== Software ==

* [ RTL-SDR]
* [ Installing SDR on OSX]
* [ Weather images decoding software]

== Hardware ==

* [ Turnstile antenna build instructions]
* [ Quadrifilar Helicoidal antenna calculator]</rev>
      <page pageid="2162" ns="0" title="Retail Therapy">
          <rev contentformat="text/x-wiki" contentmodel="wikitext" xml:space="preserve">'''Objective:''' Build two &quot;robots&quot; that will primarily take latitude/longitude associated photos using a RasPi per &quot;robot&quot;. 

&quot;Context&quot;: [ sail on a residency inside a commercial cargo ship]


* Robot 1: 
** Take a picture every 10 minutes.
** Record GPS' lat/lon with image
** Synchronize RasPi system time with GPS
** Runs on battery, must be recharged daily.

* Robot 2:
** Take a picture every 10 minutes.
** Record GPS' lat/lon with image
** Synchronize RasPi system time with GPS
** RasPi connects to any available open WiFi network and will upload all new images. &lt;ref&gt;[ &quot;JoinOpenWifi Tool&quot;]&lt;/ref&gt;
** Runs on battery, must be recharged daily.

'''Working Principle:'''
* The robots are powered using a phone battery pack that is charged via a standard USB charger.
* Both RasPis will be in the &quot;box&quot; with only the two USB power cables and possibly the WiFi antenna sticking out.
* GPS module must be on the exterior of the glass mirror box (faraday).
* Software makes sure that images are taken, GPS time is synchronised with OS time and a watchdog process reboots (or restarts the process) if something unexpected happens.
* Remote (while physically next to the box) SSH access to the RasPis can be provided using standard Ethernet cables. WiFi is not possible as this will be used for the &quot;autoupload&quot; mechanism and better left alone for this purpose.


&lt;references /&gt;</rev>