Time Server NTP Division

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25.09.2008  - Award  contract   for  building  next

                        generation  Timekeping  System for

                        CNS & Air Traffic Control  in Poland                                                                   

15.06.2008  - Galileo time receiver delivery

                         to Space  Research  Centre of

                         Polish    Academy of Sciences

read more  

 

 

09.05.2008  - UE "Fare Project" finance Elproma

                         NTP servers purchase for new EC

                         memebers.

read more  

 

20.11.2007  - Warsaw (Poland). Elproma has

                         joined TA forum  supervised by

                         polish state and BIPM (France).

 

                        
 

19.09.2007  - New PSTN, ISDN, GSM time support

New NTS-dialup can be equipped with analogue PSTN, digital ISDN and GSM/GPRS/EDGE modems.

28.08.2007 - Introducing new double GPS antennas

All 2007 Elproma's NTP servers can be equipped with 2xGPS and 2xDCF77 redundant antennas.

06.01.2007 - Elproma joins Galileo contributor group

Elproma joins Galileo contributor group (link ...)

20.06.2006 - Thales Air Defance choose Elproma

Thales Air Defence is a major subsidiary of Thales Group dedicated to Air Defence Weapon Systems and Radar development. They have choosen Elproma  custom build NTP servers for radar timestamping.

 

 

Einstein's general relativity plays role in GPS time

... The GPS satellite clocks are moving at 14,000 km/hr in orbits that circle the Earth twice per day, much faster than clocks on the surface of the Earth, and Einstein's theory of special relativity says that rapidly moving clocks tick more slowly, by about 7 microseconds (millionths of a second) per day.

Also, the orbiting GPS clocks are 20,000 km above the Earth, and experience gravity that is four times weaker than that on the ground.  Einstein's general relativity theory says that gravity curves space and time, resulting in a tendency for the orbiting clocks to tick slightly faster, by about 45 microseconds per day. The net result is that time on a GPS satellite clock advances faster than a clock on the ground by about 38 microseconds per day. ...

                                       Clifford M. Will /Phisics Central/

Atomic Time (TA): a time scale based on the hyperfine resonance of Cesium 133. Atomic Second is precisely, 9,192,631,770 cycles of the cesium resonance.

GPS Time: GPS time is the basic time which the entire system (Control-Space-User) utilizes for its time delay ranging techniques. It is the free running time kept by the Control Segment based upon one of the Monitor Station Cesium clocks . It is generally considered in units of GPS week number and seconds of week.

 

Satellite Time: Each satellite broadcasts its approximation of GPS time. This approximation is known as satellite time. It consists of the P or C/A code state (Z count) and the satellite clock correction terms in the 50 BPS data stream. Each satellite’s time is approximately (within the SS-GPS-300 error budget) equal to GPS time.

 

All above further references to time are in UTC.

 

Coordinated Universal Time (UTC): An internationally

agreed upon time scale which has the same rate as Atomic Time (TA). The. UTC is corrected by step adjustments of exactly one second, as needed to remain within 0.9 seconds of Astronomical Time (UTl). The Burbau International de L’HeureN (BIPM)

determines when step adjustments are needed. This is the universal time used by DOD and other precise time users.

 

Tomasz Widomski

 

                           read glossary of Time terms