<HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <META NAME="GENERATOR" CONTENT="Mozilla/4.01 [en] (Win95; I) [Netscape]"> <TITLE>Magnavox MX4200 GPS Receiver</TITLE> </HEAD> <BODY> <H3>Magnavox MX4200 GPS Receiver</H3> <HR> <H4>Synopsis</H4> Address: 127.127.9.<I>u</I> <BR>Reference ID: <TT>GPS</TT> <BR>Driver ID: <TT>GPS_MX4200</TT> <BR>Serial Port: <TT>/dev/gps<I>u</I></TT>; 4800 baud, 8-bits, no parity <BR>Features: <TT>ppsclock</TT> (required) <H4>Description</H4> This driver supports the Magnavox MX4200 Navigation Receiver adapted to precision timing applications. It requires the <TT>ppsclock</TT> line discipline or streams module described in the <A HREF="ldisc.htm">Line Disciplines and Streams Modules</A> page. It also requires a <A HREF="gadget.htm">gadget box</A> and 1-PPS level converter, such as described in the <A HREF="pps.htm">Pulse-per-second (PPS) Signal Interfacing</A> page. <P>This driver supports all compatible receivers such as the 6-channel MX4200, MX4200D, and the 12-channel MX9212, MX9012R, MX9112. <P> <A HREF="http://www.leica-gps.com/"><IMG align=left HEIGHT=143 WIDTH=180 SRC="pic/9400n.jpg" ALT="Leica MX9400N Navigator"></A> <A HREF="http://www.leica-gps.com/">Leica Geosystems</A> acquired the Magnavox commercial GPS technology business in February of 1994. They now market and support former Magnavox GPS products such as the MX4200 and its successors.</P> <BR CLEAR=LEFT> Leica MX9400N Navigator. <P> <H4>Operating Modes</H4> This driver supports two modes of operation, static and mobile, controlled by clock flag 2. <P>In static mode (the default) the driver assumes that the GPS antenna is in a fixed location. The receiver is initially placed in a "Static, 3D Nav" mode, where latitude, longitude, elevation and time are calculated for a fixed station. An average position is calculated from this data. After 24 hours, the receiver is placed into a "Known Position" mode, initialized with the calculated position, and then solves only for time. <P>In mobile mode, the driver assumes the GPS antenna is mounted on a moving platform such as a car, ship, or aircraft. The receiver is placed in "Dynamic, 3D Nav" mode and solves for position, altitude and time while moving. No position averaging is performed. <H4>Monitor Data</H4> The driver writes each timecode as received to the <TT>clockstats</TT> file. Documentation for the <CITE>NMEA-0183</CITE> proprietary sentences produced by the MX4200 can be found in <A HREF="mx4200data.htm">MX4200 Receiver Data Format</A>. <H4>Fudge Factors</H4> <DL> <DT> <TT>time1 <I>time</I></TT></DT> <DD> Specifies the time offset calibration factor, in seconds and fraction, with default 0.0.</DD> <DT> <TT>time2 <I>time</I></TT></DT> <DD> Not used by this driver.</DD> <DT> <TT>stratum <I>number</I></TT></DT> <DD> Specifies the driver stratum, in decimal from 0 to 15, with default 0.</DD> <DT> <TT>refid <I>string</I></TT></DT> <DD> Specifies the driver reference identifier, an ASCII string from one to four characters, with default <TT>GPS</TT>.</DD> <DT> <TT>flag1 0 | 1</TT></DT> <DD> Not used by this driver.</DD> <DT> <TT>flag2 0 | 1</TT></DT> <DD> Assume GPS receiver is on a mobile platform if set.</DD> <DT> <TT>flag3 0 | 1</TT></DT> <DD> Not used by this driver.</DD> <DT> <TT>flag4 0 | 1</TT></DT> <DD> Not used by this driver.</DD> </DL> Additional Information <P><A HREF="refclock.htm">Reference Clock Drivers</A> <HR> <ADDRESS> David L. Mills (mills@udel.edu)</ADDRESS> </BODY> </HTML>