[ntp:questions] IEEE 1588 (PTP) at the nanosecond level?

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Wed Mar 19 18:01:39 UTC 2014


Brian Inglis wrote:
> Martin Burnicki wrote:
>> At the single nanosecond accuracy level it would also be
>>  important to *which* local realizations UTC(k) you are referring,
>>  UTC(NIST), UTC(USNO), UTC(PTB), ...
>
> The source would need to provided by or calibrated against the ref,
>>  at some cost!
> Unless at that level you just call it UTC(GPS), UTC(LCL), or UTC(MB)!

Since you can get a e.g. Trimble
  NTP Server GNSS GPS with 440 channels

 GPS, Simultaneous L1 C/A, L2E, L2C, L5
 Galileo, Simultaneous L1 BOC, E5A, E5B, E5AltBOC2
 GLONASS, Simultaneous L1 C/A, L1 P, L2 C/A , L2 P, L3 CDMA
 BeiDou, B1, B2

 SBAS, Simultaneous L1 C/A, L5
 QZSS, L1 C/A, L1 SAIF, L2C, L5, LEX
 WAAS
 EGNOS
 MSAS
 GAGAN,
 SDCM,
 OmniSTAR, L-Band VBS/XP/G2/HP
 RTX, (Trimble WWC)
 ...


  Which have four different UTC base sources,
   the units must already do something to combine the results,
   to approximate {calculate} UTC(TAI)?.


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