More NTP

http://www.schlitt.net/scripts/ntp/index.html

NTP management scripts

I've been participating in the NTP pool project since July 2003, and during this time, I've developed a few scripts to help monitor and manage NTP stuff. I figure that these scripts might be useful to others, so I'm posting them here, but please don't expect anything fancy. The documentation is bad, there are few comments, and they haven't been tested on any machine other than mine. Feel free to use the scripts for anything you want. They are in the public domain.

I recommend getting at least ntp_clients, ntp_clients_stats, and ntp_pool_dns. These can all be downloaded via ntp_scripts.tar.gz.

http://gpsd.mainframe.cx/
This is a gpsd server in a really bad location beautiful suburban Sunnyvale. Very poor visibility from here: view1.png view2.png The hardware is a Garmin GPS18/LVC attached to a Soekris Net4801 (view the dmesg). running OpenBSD, gpsd and some custom utilities This machine is maintained by Chris Kuethe.

http://tycho.usno.navy.mil/gpstt.html

USNO GPS Time Transfer

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The U.S. Naval Observatory (USNO) monitors the timing of the GPS to provide a reliable and stable coordinated time reference for the satellite navigation system. The USNO provides two modes of operation to monitor the GPS: the Standard Positioning Service (SPS) and the Precise Positioning Service (PPS). The USNO SPS consists of a coarse acquisition (C/A) code, single channel timing receiver and the processed data are available on the USNO GPS timing data website http://tycho.usno.navy.mil/gps_datafiles.html.

IGS Products

The IGS collects, archives, and distributes GPS and GLONASS observation data sets of sufficient accuracy to meet the objectives of a wide range of scientific and engineering applications and studies. These data sets are analyzed and combined to form the IGS products shown in the table below.

IGS products support scientific activities such as improving and extending the International Terrestrial Reference Frame (ITRF) maintained by the International Earth Rotation and Reference Systems Service (IERS), monitoring deformations of the solid Earth and variations in the liquid Earth (sea level, ice sheets, etc.) and in Earth rotation, determining orbits of scientific satellites, and monitoring the troposphere and ionosphere.

http://www.penninespringmusic.co.uk/rich/software/