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versalogic_vl-mpeu-g2_ntp

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versalogic_vl-mpeu-g2_ntp [2014/06/21 18:49] – [PC Engines APU / Versalogic - NTP server] adminversalogic_vl-mpeu-g2_ntp [2015/01/24 17:40] – [Leap second file] admin
Line 136: Line 136:
  
   * Install lftp. <code>apt-get install lftp</code>   * Install lftp. <code>apt-get install lftp</code>
-  * Create leap second download script **/usr/local/bin/get_leap.sh** <code>#!/bin/bash +  * Create leap second download script [[get_leap_script|/usr/local/bin/get_leap.sh]]
- +
-# This script will download the latest leap second file, +
-# update the NTP configuration and restart ntpd. +
- +
-# Leap second file location +
-#leapremote="ftp://time.nist.gov/pub/" +
-leapremote="ftp://tycho.usno.navy.mil/pub/ntp/" +
- +
-# Local file name +
-leaplocaldir="/var/lib/ntp/" +
-leaplocalfile="$leaplocaldir/leap-seconds" +
- +
-# Get latest leap second file +
-/usr/bin/lftp -e 'set net:timeout 10 ; cls -1 --sort=date | head -1 > /tmp/leap ; exit' $leapremote +
-if [ $? -ne 0 ]; then +
-  echo "FTP problem, exiting." +
-  exit 1 +
-fi +
- +
-if [ -f "$leaplocaldir$(cat /tmp/leap)" ]; then +
-  echo "File $leaplocaldir$(cat /tmp/leap) already exists. Not downloading." +
-else +
-  cd "$leaplocaldir" +
-  /usr/bin/lftp -e "set net:timeout 10 ; get $(cat /tmp/leap) ; exit" $leapremote +
-  ln -sfn "$leaplocaldir$(cat /tmp/leap)" "$leaplocalfile" +
-  service ntp restart +
-fi</code> +
-  * Change executable mode <code>chmod +x /usr/local/bin/get_leap.sh</code> +
-  * Download new file weekly. Create **/etc/cron.weekly/leapsecond** <code>#!/bin/bash +
- +
-/usr/local/bin/get_leap.sh</code>+
   * Change executable mode <code>chmod +x /etc/cron.weekly/leapsecond</code>   * Change executable mode <code>chmod +x /etc/cron.weekly/leapsecond</code>
 ====Configure, firmware update ublox NEO-7 module==== ====Configure, firmware update ublox NEO-7 module====
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 ===Recommended settings for timing applications=== ===Recommended settings for timing applications===
   * SBAS -> Subsystem: Disabled.   * SBAS -> Subsystem: Disabled.
-  * (not supported on u-blox 7) TMODE2 -> Survey-in. If the position is known, the receiver can provide an accurate time solution by tracking only one satellite. For an unknown position, the receiver needs a minimum of four satellites to calculate a position fix and to solve for a timing solution. This is known as survey-in and can be chosen using the UBX-CFG-TMODE2 message. It is recommended to use survey-in only for non-moving platform applications. For optimal performance a known fixed position of the antenna should be used.+  * (not supported by u-blox 7) TMODE2 -> Survey-in. If the position is known, the receiver can provide an accurate time solution by tracking only one satellite. For an unknown position, the receiver needs a minimum of four satellites to calculate a position fix and to solve for a timing solution. This is known as survey-in and can be chosen using the UBX-CFG-TMODE2 message. It is recommended to use survey-in only for non-moving platform applications. For optimal performance a known fixed position of the antenna should be used.
   * NAV5 -> Dynamic Model: Stationary   * NAV5 -> Dynamic Model: Stationary
   * NAV5 -> Min SV Elevation: 10   * NAV5 -> Min SV Elevation: 10
   * Save config, restart receiver. Receiver -> Action -> Cold start   * Save config, restart receiver. Receiver -> Action -> Cold start
versalogic_vl-mpeu-g2_ntp.txt · Last modified: 2021/10/09 15:14 by 127.0.0.1