124 lines
3.3 KiB
HTML
124 lines
3.3 KiB
HTML
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<HTML>
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<HEAD>
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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
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<META NAME="GENERATOR" CONTENT="Mozilla/4.01 [en] (Win95; I) [Netscape]">
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<TITLE>Magnavox MX4200 GPS Receiver</TITLE>
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</HEAD>
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<BODY>
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<H3>Magnavox MX4200 GPS Receiver</H3>
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<HR>
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<H4>Synopsis</H4>
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Address: 127.127.9.<I>u</I>
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<BR>Reference ID: <TT>GPS</TT>
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<BR>Driver ID: <TT>GPS_MX4200</TT>
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<BR>Serial Port: <TT>/dev/gps<I>u</I></TT>; 4800 baud, 8-bits, no parity
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<BR>Features: <TT>ppsclock</TT> (required)
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<H4>Description</H4>
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This driver supports the Magnavox MX4200 Navigation Receiver adapted to
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precision timing applications. It requires the <TT>ppsclock</TT> line
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discipline or streams module described in the <A HREF="ldisc.htm">Line
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Disciplines and Streams Modules</A> page. It also requires a <A
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HREF="gadget.htm">gadget box</A> and 1-PPS level converter, such as
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described in the <A HREF="pps.htm">Pulse-per-second (PPS) Signal
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Interfacing</A> page.
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<P>This driver supports all compatible receivers such as the 6-channel
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MX4200, MX4200D, and the 12-channel MX9212, MX9012R, MX9112.
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<P>
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<A HREF="http://www.leica-gps.com/">Leica Geosystems</A> acquired
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the Magnavox commercial GPS technology business in February of 1994.
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They now market and support former Magnavox GPS products such as the
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MX4200 and its successors.</P>
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<P>
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<H4>Operating Modes</H4>
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This driver supports two modes of operation, static and mobile, controlled
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by clock flag 2.
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<P>In static mode (the default) the driver assumes that the GPS antenna
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is in a fixed location. The receiver is initially placed in a "Static,
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3D Nav" mode, where latitude, longitude, elevation and time are
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calculated for a fixed station. An average position is calculated from
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this data. After 24 hours, the receiver is placed into a "Known
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Position" mode, initialized with the calculated position, and then
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solves only for time.
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<P>In mobile mode, the driver assumes the GPS antenna is mounted on a moving
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platform such as a car, ship, or aircraft. The receiver is placed in "Dynamic,
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3D Nav" mode and solves for position, altitude and time while moving. No
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position averaging is performed.
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<H4>Monitor Data</H4>
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The driver writes each timecode as received to the <TT>clockstats</TT>
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file. Documentation for the <CITE>NMEA-0183</CITE> proprietary
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sentences produced by the MX4200 can be found in
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<A HREF="mx4200data.htm">MX4200 Receiver Data Format</A>.
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<H4>Fudge Factors</H4>
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<DL>
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<DT>
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<TT>time1 <I>time</I></TT></DT>
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<DD>
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Specifies the time offset calibration factor, in seconds and fraction,
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with default 0.0.</DD>
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<DT>
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<TT>time2 <I>time</I></TT></DT>
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<DD>
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Not used by this driver.</DD>
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<DT>
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<TT>stratum <I>number</I></TT></DT>
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<DD>
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Specifies the driver stratum, in decimal from 0 to 15, with default 0.</DD>
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<DT>
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<TT>refid <I>string</I></TT></DT>
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<DD>
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Specifies the driver reference identifier, an ASCII string from one to
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four characters, with default <TT>GPS</TT>.</DD>
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<DT>
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<TT>flag1 0 | 1</TT></DT>
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<DD>
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Not used by this driver.</DD>
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<DT>
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<TT>flag2 0 | 1</TT></DT>
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<DD>
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Assume GPS receiver is on a mobile platform if set.</DD>
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<DT>
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<TT>flag3 0 | 1</TT></DT>
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<DD>
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Not used by this driver.</DD>
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<DT>
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<TT>flag4 0 | 1</TT></DT>
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<DD>
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Not used by this driver.</DD>
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</DL>
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Additional Information
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<P><A HREF="refclock.htm">Reference Clock Drivers</A>
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<HR>
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<ADDRESS>
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David L. Mills (mills@udel.edu)</ADDRESS>
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</BODY>
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</HTML>
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