embedaddon/ntp/html/drivers/driver9.html - view

File: [ELWIX - Embedded LightWeight unIX -] / embedaddon / ntp / html / drivers / driver9.html
Revision 1.1.1.1 (vendor branch): download - view: text, annotated - select for diffs - revision graph
Tue May 29 12:08:38 2012 UTC (12 years, 7 months ago) by misho
Branches: ntp, MAIN
CVS tags: v4_2_6p5p0, v4_2_6p5, HEAD

ntp 4.2.6p5

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <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> <link href="scripts/style.css" type="text/css" rel="stylesheet"> </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> <p>This driver supports the Magnavox MX4200 Navigation Receiver adapted to precision timing applications. This driver supports all compatible receivers such as the 6-channel MX4200, MX4200D, and the 12-channel MX9212, MX9012R, MX9112.</p> <p><a href="http://www.leica-gps.com/"><img src="../pic/9400n.jpg" alt="Leica MX9400N Navigator" height="143" width="180" align="left"></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"> <p>Leica MX9400N Navigator.</p> <h4>Operating Modes</h4> <p>This driver supports two modes of operation, static and mobile, controlled by clock flag 2.</p> <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> <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.</p> <h4>Monitor Data</h4> <p>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.html">MX4200 Receiver Data Format</a>.</p> <h4>Fudge Factors</h4> <dl> <dt><tt>time1 <i>time</i></tt> <dd>Specifies the time offset calibration factor, in seconds and fraction, with default 0.0. <dt><tt>time2 <i>time</i></tt> <dd>Not used by this driver. <dt><tt>stratum <i>number</i></tt> <dd>Specifies the driver stratum, in decimal from 0 to 15, with default 0. <dt><tt>refid <i>string</i></tt> <dd>Specifies the driver reference identifier, an ASCII string from one to four characters, with default <tt>GPS</tt>. <dt><tt>flag1 0 | 1</tt> <dd>Not used by this driver. <dt><tt>flag2 0 | 1</tt> <dd>Assume GPS receiver is on a mobile platform if set. <dt><tt>flag3 0 | 1</tt> <dd>Not used by this driver. <dt><tt>flag4 0 | 1</tt> <dd>Not used by this driver. </dl> <h4>Additional Information</h4> <p><a href="../refclock.html">Reference Clock Drivers</a> </p> <hr> <script type="text/javascript" language="javascript" src="scripts/footer.txt"></script> </body> </html>