GNSS info. KStars
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@ -432,3 +432,6 @@
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% sidereal
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% slew
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% sky chart
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% PPS (gps)
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% gpsd
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% List of Software ?
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@ -73,7 +73,7 @@ can be seen in Figure
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\begin{center}
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\centering
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\includegraphics[keepaspectratio=true,height=1.00\textheight,width=1.00\textwidth,angle=0]{video-enclosure-mount-tripod.png}
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\caption{SatNOGS-Optical ground station prototype.}
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\caption{SatNOGS Optical ground station prototype.}
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\label{fig:video-enclosure-mount-tripod}
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\index{telescope}\index{tripod}\index{mount}\index{enclosure}
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\end{center}
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116
src/Software.tex
116
src/Software.tex
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@ -328,7 +328,7 @@ Software that can be used with telescope tracking mounts:
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\item [INDI] --- Main client/server used by other applications.
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\item [KStars] --- Sky charts, INDI control.
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\item [Ekos] --- Application used within KStars for remote control
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of telescopes and related hardware via \gls{INDI}.
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of \glspl{telescope} and related hardware via \gls{INDI}.
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\item [Stellarium] --- Sky charts, has \gls{INDI} plugin.
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\item [Other INDI] --- Many more applications work with \gls{INDI}.
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\item [INDIGO] --- Positions itself as a next-generation INDI (?).
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@ -386,10 +386,31 @@ hardware described in section \ref{sec:hardware-mounts}, page \pageref{sec:hardw
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For the purposes here, described below will be using KStars with a
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Sky-Watcher tracking mount with INDI and Ekos.
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It will be used in sidereal tracking mode, where the stars will appear as
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See figure \ref{fig:video-enclosure-mount-tripod}, page \pageref{fig:video-enclosure-mount-tripod}
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for a photo of the setup used with KStars below.
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The telescope mount will be used in sidereal tracking mode,
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where the stars will appear as
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``points'', and the \glspl{satellite} will appear as trails.
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The mount is not used in a satellite tracking mode.
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Sidereal is the ``standard'' tracking mode of \glspl{telescope}.
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\index{Sky-Watcher}\index{INDI}\index{Ekos}
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KStars is the ``main'' application, but it depends on other key parts.
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\gls{INDI} is the protocol that KStars uses for telescope control.
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\gls{INDI} itself is a collection of applications.
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While KStars has the main sky chart and Ekos is launched within it,
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the actual mount control is done with the Ekos application.
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While it may sound complex, all of this is set up pretty easily in
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\gls{Debian}.
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\begin{minted}{sh}
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# Quick and dirty from memory, something like:
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sudo apt update
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sudo apt install kstars indi-bin indi-eqmod indi-gpsd
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\end{minted}
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\begin{sidewaysfigure}[p!]
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\begin{center}
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\includegraphics[keepaspectratio=true,height=1.00\textheight,width=1.00\textwidth,angle=0]{kstars-skychart.png}
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@ -417,3 +438,94 @@ It will be used in sidereal tracking mode, where the stars will appear as
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\end{center}
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\end{sidewaysfigure}
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\section{GNSS}
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\label{sec:software-overview}
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\index{GNSS}\index{GPS}\index{Galileo}\index{GLONASS}\index{Beidou}
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\index{gpsd}
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\gls{GNSS} is used for time synchornization and for (somewhat)
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accurately determining the location of the observation.
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\gls{GNSS} collectively includes the USA \gls{GPS}, Europe's Galileo,
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Russia's GLONASS, and China's Beidou, as well as other
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regional systems.
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\index{GPS}\index{Galileo}\index{GLONASS}\index{Beidou}
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A basic, widely available \gls{COTS} USB \gls{GNSS} device
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with a basic (or no!) \gls{antenna} plugged into the embedded
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computer can get time and location accurate enough for the
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purposes here. See various U-Blox devices, for example.
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\index{COTS}\index{USB}
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In \gls{Debian} \gls{GNSS} service with a USB device can be provided
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by the \texttt{gpsd} application.
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\begin{minted}{sh}
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sudo apt install gpsd gpsd-tools
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\end{minted}
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Edit the configuration file, \texttt{/etc/default/gpsd} like:
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\begin{minted}{sh}
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DEVICES="/dev/ttyACM0"
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GPSD_OPTIONS="-Gn"
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USBAUTO="false"
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\end{minted}
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This will start a \texttt{gpsd} daemon listening on all interfaces,
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so it can be used by other computers on the network (such as if
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acquire and process are on different machines). Using the
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device \texttt{/dev/ttyACM0} can be problematic if there are multiple
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\texttt{/dev/ttyACM*} devices. Perhaps something like this could be
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used in that case:
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\begin{minted}{sh}
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DEVICES="/dev/serial/by-id/usb-u-blox_AG_-_www.u-blox.com_u-blox_GNSS_receiver-if00"
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\end{minted}
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Even with \texttt{gpsd} configuration listening on all IPs,
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don't think \texttt{systemd} won't do what it likes. So
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you may have to do:
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\begin{minted}{sh}
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systemctl edit --full gpsd.socket
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\end{minted}
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And create a configuration like this (I have IPv6 disabled, in this case):
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\begin{minted}{sh}
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[Unit]
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Description=GPS (Global Positioning System) Daemon Sockets
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[Socket]
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ListenStream=/run/gpsd.sock
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# ListenStream=[::]:2947
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ListenStream=0.0.0.0:2947
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SocketMode=0600
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BindIPv6Only=no
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[Install]
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WantedBy=sockets.target
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\end{minted}
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(Re)start:
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\begin{minted}{sh}
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sudo systemctl restart gpsd.service gpsd.socket
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\end{minted}
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Test all is good:
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\begin{minted}{sh}
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gpsmon -n
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# or
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cgps -u m
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\end{minted}
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Enable to start on boot:
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\begin{minted}{sh}
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sudo systemctl enable gpsd.service gpsd.socket
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\end{minted}
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