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11 Magnavox MX4200 GPS Receiver</H3>
16 Address: 127.127.9.<I>u</I>
17 <BR>Reference ID: <TT>GPS</TT>
18 <BR>Driver ID: <TT>GPS_MX4200</TT>
19 <BR>Serial Port: <TT>/dev/gps<I>u</I></TT>; 4800 baud, 8-bits, no parity
20 <BR>Features: <TT>ppsclock</TT> (required)
23 This driver supports the Magnavox MX4200 Navigation Receiver adapted to
24 precision timing applications. It requires the <TT>ppsclock</TT> line
25 discipline or streams module described in the <A HREF="ldisc.htm">Line
26 Disciplines and Streams Modules</A> page. It also requires a <A
27 HREF="gadget.htm">gadget box</A> and 1-PPS level converter, such as
28 described in the <A HREF="pps.htm">Pulse-per-second (PPS) Signal
31 <P>This driver supports all compatible receivers such as the 6-channel
32 MX4200, MX4200D, and the 12-channel MX9212, MX9012R, MX9112.
35 <A HREF="http://www.leica-gps.com/">
36 <IMG SRC="pic/9400n.jpg" ALT="Leica MX9400N Navigator" ALIGN=LEFT></A>
37 <A HREF="http://www.leica-gps.com/">Leica Geosystems</A> acquired
38 the Magnavox commercial GPS technology business in February of 1994.
39 They now market and support former Magnavox GPS products such as the
40 MX4200 and its successors.</P>
43 Leica MX9400N Navigator.
49 This driver supports two modes of operation, static and mobile, controlled
52 <P>In static mode (the default) the driver assumes that the GPS antenna
53 is in a fixed location. The receiver is initially placed in a "Static,
54 3D Nav" mode, where latitude, longitude, elevation and time are calculated
55 for a fixed station. A DOP-weighted running average position is calculated
56 from this data. After 24 hours, the receiver is placed into a "Known Position"
57 mode, initialized with the calculated position, and then solves only for
60 <P>In mobile mode, the driver assumes the GPS antenna is mounted on a moving
61 platform such as a car, ship, or aircraft. The receiver is placed in "Dynamic,
62 3D Nav" mode and solves for position, altitude and time while moving. No
63 position averaging is performed.
66 The driver writes each timecode as received to the <TT>clockstats</TT>
67 file. Documentation for the <CITE>NMEA-0183</CITE> proprietary
68 sentences produced by the MX4200 can be found in
69 <A HREF="mx4200data.htm">MX4200 Receiver Data Format</A>.
76 <TT>time1 <I>time</I></TT></DT>
79 Specifies the time offset calibration factor, in seconds and fraction,
80 with default 0.0.</DD>
83 <TT>time2 <I>time</I></TT></DT>
86 Not used by this driver.</DD>
89 <TT>stratum <I>number</I></TT></DT>
92 Specifies the driver stratum, in decimal from 0 to 15, with default 0.</DD>
95 <TT>refid <I>string</I></TT></DT>
98 Specifies the driver reference identifier, an ASCII string from one to
99 four characters, with default <TT>GPS</TT>.</DD>
102 <TT>flag1 0 | 1</TT></DT>
105 Not used by this driver.</DD>
108 <TT>flag2 0 | 1</TT></DT>
111 Assume GPS receiver is on a mobile platform if set.</DD>
114 <TT>flag3 0 | 1</TT></DT>
117 Not used by this driver.</DD>
120 <TT>flag4 0 | 1</TT></DT>
123 Not used by this driver.</DD>
125 Additional Information
127 <P><A HREF="refclock.htm">Reference Clock Drivers</A>
130 David L. Mills (mills@udel.edu)</ADDRESS>