VLBI Frequency Comparison in 2018 Ver.6

1. Experiments List

2. Frequency Link

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

   • 	Sr/Yb	Uncertainty[1.e-16]	WRMS[1.e-16]	Chi2	Comment
     IPPP	4.3	1.7	10.8	5.0	IPPP uncertainty is given from error by lsq fit 1st polynomial
     	4.3	3.8	10.8	1.0	Error of the data were scaled to make Chi2 unity
     VLBI	1.8	1.7	9.5	3.6	VLBI uncertainty is formal error of SOLVE.
     	1.8	3.2	9.5	1.0	Error of the data were scaled to make Chi2 unity

     • Link is computed by weighted Average (i= each link elements):
     • Uncertainty=Error is evaluated by:
     • WRMS:
     • 'Chi2' is reduced chi square normalized by freedom:
     
     
     
   • Link data [xlsx]
   
   
2. Plot of Link Data (Updaetd on 1 Oct 2019)

   Sr/Yb link	VLBI-IPPP diff.		Sr/Yb link	VLBI-IPPP diff.
   		Error Scaled for Chi2 Unity =>

   Ver.5 (Removing inappropriate data in 24 Nov.2018, re-Aligned epoch for all link data in this session. )

   Sr/Yb link	VLBI-IPPP diff.

   Ver.4 (Epoch was not always unified. )

   Sr/Yb link	VLBI-IPPP diff.

   
   
3. Double Difference Between VLBI and IPPP in 2018 and 2019
   

   	04 Nov. MJD:58426.6659	14 Nov. MJD:58436.9371	24 Nov. MJD:58447.1685	05 Dec. MJD:58457.3954	15 Dec. MJD:58467.6348	25 Dec. MJD:58477.8535	15 Jan. MJD:58498.8535	25 Jan. MJD:58508.7208	14 Feb. MJD:58528.8707
   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)
   	2018.287.15:39:20 -- 288.20:32:10 MJD0:58406.2540	2018.308.00:40:13 -- 309.07:17:40 MJD0:58426.6659	2018.318.08:00:30 -- 319.12:58:20 MJD0:58436.9371	2018.328.13:39:13 -- 329.18:26:22 MJD0:58447.1685	2018.338.19:00:30 -- 339.23:58:20 MJD0: 58457.3954	2018.349.00:30:12 -- 350.05:58:10 MJD0: 58467.6348	2018.359.06:00:30 -- 360.10:57:30 MJD0:58477.8535	2019.015.06:00:30 -- 016.10:57:40 MJD0:58498.8535	2019.025.03:11:10 -- 026.07:24:40 MJD0:58508.7208	2019.045.03:00:22 -- 046.14:47:20 MJD0:58528.8707
   IPPP HM3(NICT)-HM(INAF)	--	4.0297(23)e-13 [s/s]	3.9911(34)e-13 [s/s]	3.9368(14)e-13 [s/s]	3.8729(15)e-13 [s/s]	3.81455(144)e-13 [s/s]	3.7789(16)e-13 [s/s]	7.17654(17)e-13 [s/s]	7.1060(2)e-13 [s/s]	7.01511(17)e-13 [s/s]
   	--	MJD0:58426.6659 -0.70 +0.70	MJD0:58436.9371 -0.65 +0.65	MJD0:58447.1685 -1.0 +1.0	MJD0:58457.3954 -0.65 +0.65	MJD0:58467.6348 -0.65 +0.65	MJD0:58477.8535 -0.65 +0.65	MJD0:58498.8535 -0.65 +0.65	MJD0:58508.7208 -0.65 +0.65	MJD0:58528.8707 -0.80 +0.80
   DMTD HM3(NICT)-HM15(NICT)	--				12.7739(9)e-13 s/s	12.8804(8)e-13 s/s	12.9336(6)e-13 s/s	13.0840(9)e-13 s/s	13.1588(8)e-13 s/s	1hour interval data: 13.3440(10)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
   	--				MJD0:58457.3954 -1.0 +1.0	MJD0:58467.6348 -1.0 +1.0	MJD0:58477.8535 -1.0 +1.0	MJD0:58498.8535 -1.0 +1.0	MJD0:58508.7208 -1.0 +1.0	MJD0:58528.8707 -1.0 +1.0
   Sr-HM15,HM3(NICT)	-5.0087(23) e-13 s/s	-5.0109(28) e-13 s/s	-5.0151(6) e-13 s/s	-4.9936(61) e-13 s/s	7.7732(5) e-13 s/s	7.8801(13) e-13 s/s	7.9502(15) e-13 s/s	8.1181(20) e-13 s/s	8.2087(28) e-13 s/s	8.3937(13)e-13 s/s
   	MJD0:58406.2540 -20.0 +20.0	MJD0:58426.6659 -6.0 +3.0	MJD0:58436.9371 -9.0 +0.0	MJD0:58447.1685 -11.0 -1.0	MJD0:58457.3954 -5.0 +5.0	MJD0:58467.6348 14.0 +30.0	MJD0:58477.8535 -15.0 +15.0	MJD0:58498.8535 -7. 0 +8.0	MJD0:58508.7208 -4.0 +7.0	MJD0:58528.8707 -0.7 +0.6
   Fiber Link HM(INAF)-HM3(INRiM)	9.759(5)e-13 s/s	9.9404(18)e-13 s/s	10.0283(30)e-13 s/s	10.1158(46)e-13 s/s	10.1728(80)e-13 s/s	10.2645(32)e-13 s/s	10.3690(31)e-13 s/s	7.0500(55)e-13 s/s	7.1311(27)e-13 s/s	7.2413(45)e-13 s/s
   	MJD0:58406.2540 -1 +10	MJD0:58426.6659 -10 +10	MJD0:58436.9371 -10 +10	MJD0:58447.1685 -10 +6	MJD0:58457.3954 -6 +4	MJD0:58467.6348 -10 +7	MJD0:58477.8535 -11 +15	MJD0:58498.8535 -1 +10	MJD0:58508.7208 -10 +10	MJD0:58528.8707 -30 +8
   HM3(INRiM)-Yb	-8.8832(11)e-13 s/s	-8.9644(14)e-13 s/s	-8.9935(10)e-13 s/s	-9.0272(11)e-13 s/s	-9.042(4)e-13 s/s	-9.0925(21)e-13 s/s	-9.1348(12)e-13 s/s(1st Poly) -9.1596(40)e-13 s/s(2nd Poly)	-9.2544(10)e-13 s/s	-9.2759(6)e-13 s/s	-9.2958(15)e-13 s/s
   	MJD0:58406.2540 -10 +10	MJD0:58426.6659 -10 +10	MJD0:58436.9371 -20 +30	MJD0:58447.1685 -20 +20	MJD0:58457.3954 -0 +10	MJD0:58467.6348 -10 +0	MJD0:58477.8540 -20 +20	MJD0:58498.8535 -10 +20	MJD0:58508.7208 -20 +20	MJD0:58528.8707 -1 +1
   Summary [(Sr/Yb) - 1]	VLBI:+4.2(6.8)e-16	VLBI:-7.7(4.5)e-16, IPPP:-5.6(4.4)e-16	VLBI:1.5(4.0)e-16, IPPP:10.5(4.7)e-16	VLBI:14.8(8.0)e-16, IPPP:31.9(7.6)e-16	VLBI:-6.2(9.3)e-16, IPPP:3.2(9.1)e-16	VLBI:-14.1(4.2)e-16, IPPP:-14.4(4.1)e-16	VLBI:10.4(5.6)e-16, IPPP:4.9(5.5)e-16	VLBI:5.1(6.6)e-16, IPPP:6.1(9.0)e-16	VLBI:16.3(4.8)e-16, IPPP:11.3(3.9)e-16	VLBI:+2.1 (5.4)e-16, IPPP:10.3(5.3)e-16