VLBI Frequency Comparison in 2018 Ver.4

1. Experiments List

2. Frequency Link

1. Link Summary
   Following is Frequency link over multiple H-Masers through VLBI or IPPP

   • 	Sr/Yb-1	Uncertainty[1.e-16]	WRMS[1.e-16]	Chi2	Comment
     IPPP	5.6	2.1	13.0	2.6	IPPP uncertainty is given from error by lsq fit 1st polynomial
     VLBI	1.9	2.9	8.1	0.9	VLBI uncertainty is RMS of differences of solutions.
     VLBI	4.1	1.5	8.8	3.7	VLBI uncertainty is formal error of SOLVE.

     • Link is computed by weighted Average (i= each link elements):
     • Uncertainty=Error is evaluated by:
     • WRMS:
     • 'Chi2' is reduced chi square normalized by freedom:
     
     
     Sr/Yb-1 = 1.9(2.7) [1.e-16 ] over multiple H-Masers through VLBI
     Sr/Yb-1 = 5.6(5.8) [1.e-16 ] over multiple H-Masers through IPPP
     (Uncertainty is computed from WRMS/sqrt(n). )
   • [pdf]
   • VLBI results and evaluation of uncertainty [xlsx] ,
   • Total Link data [xlsx]
   
   
2. Plot of Link Data (Updated on 24 June 2019)

   Sr/Yb link	VLBI-IPPP diff.

   
   
3. Double Difference Between VLBI and IPPP in 2018
   

   	O4 Nov.	14 Nov.	24 Nov.	04 Dec.	15 Dec.	25 Dec.	15 Jan.	25 Jan.	14 Feb.
   VLBI,IPPP
   VLBI-IPPP

4. Freq. Link by Each Single Experiment

   LINK	14-15 Oct.2018	4-5 Nov.2018	14-15 Nov.2018	24-25 Nov.2018	5-6 Dec.2018	15-16 Dec.2018	25-26 Dec.2018	15-16 Jan.2019	25-26 Jan.2019	14-15 Feb.2019
   VLBI HM3(NICT)-HM(INAF)	4.147(19)e-13 s/s Time Diff data , VLBI Solution(file)	4.0248(91)e-13 s/s Time Diff data , VLBI Solution(file)	3.9830(42)e-13s/s Time Diff data , VLBI Solution(file)	3.925(15)e-13 s/s Time Diff data , VLBI Solution(file)	3.8590(33)e-13s/s Time Diff data , VLBI Solution(file)	3.8116(38)e-13s/s Time Diff data , VLBI Solution(file)	3.7861(74)e-13 s/s Time Diff data , VLBI Solution(file)	7.1716(74)e-13 s/s Time Diff data , VLBI Solution(file)	7.114(13)e-13 s/s Time Diff data , VLBI Solution(file)	6.990(13)e-13 s/s Time Diff data , VLBI Solution(file)
   IPPP HM3(NICT)-HM(INAF)	--	4.0297(23)e-13 [s/s]	3.9916(32)e-13 [s/s]	3.9358(15)e-13 [s/s]	3.872(2)e-13 [s/s]	3.814(2)e-13 [s/s]	3.7786(17)e-13 [s/s]	7.17654(17)e-13 [s/s]	7.1058(2)e-13 [s/s]	7.0159(2)e-13 [s/s]
   DMTD HM3(NICT)-HM15(NICT)					12.7730(9)e-13 s/s	12.8805(8)e-13 s/s	12.9336(6)e-13 s/s	13.0840(9)e-13 s/s	13.15879(8)e-13 s/s	1hour interval data: 13.344(1)e-13 s/s 1sec interval data DMTD2:13.33(1)e-13 s/s DMTD3:13.344(5)e-13 s/s DMTD4:13.344(7)e-13 s/s
   Sr-HM15,HM3(NICT)	-5.0087(6) e-13 s/s	-5.0109(12) e-13 s/s	-5.0151(6) e-13 s/s	-4.9946(6) e-13 s/s	7.7733(6) e-13 s/s	7.880(7) e-13 s/s	7.9501(6) e-13 s/s	8.1181(6) e-13 s/s	8.2092(6) e-13 s/s	8.3937(6)e-13 s/s
   Fiber Link HM(INAF)-HM3(INRiM)	9.754(4)e-13 s/s	9.940(2)e-13 s/s	10.028(3)e-13 s/s	10.1117(43)e-13 s/s	10.173(8)e-13 s/s	10.264(3)e-13 s/s	10.369(3)e-13 s/s	7.050(6)e-13 s/s	7.1311(3)e-13 s/s	7.251(6)e-13 s/s 7.2412(45)e-13 s/s
   HM3(INRiM)-Yb	-8.8754(13)e-13 s/s	-8.9643(14)e-13 s/s	-8.9935(10)e-13 s/s	-9.025(1)e-13 s/s	-9.042(4)e-13 s/s	-9.0923(21)e-13 s/s	-9.1348(12)e-13 s/s	-9.254(1)e-13 s/s	-9.2759(6)e-13 s/s	-9.2958(15)e-13 s/s
   Summary [(Sr/Yb) - 1]	VLBI-link:-24(13)e-16	VLBI-link:-21(12)e-16,IPPP-link:-5(3.6)e-16	VLBI-link:3(12)e-16, IPPP-link:11(4.5)e-16	VLBI-link:25(27)e-16, IPPP-link:28(5)e-16	VLBI-link:41(23)e-16, IPPP-link:3.4(9)e-16	VLBI-link:-22(18)e-16, IPPP-link:-14.3(8)e-16	VLBI-link:12.8(8)e-16, IPPP-link:4.5(5)e-16	8.1(8.6)e-16	0.9(5.8)e-16	-9.1(7) e-16 Err -14.8 (8.5)e-16