SIMT(CNM) versus SIMT(ONRJ) via Common-View GPS
1 Day Averages 1 Hour Averages 10 Minute Averages Next Date Last Date Flip    

Laboratory 1Centro Nacional de MetrologiaID Number007End Date2021-09-13
Latitude 20° 32 min 13.284 s NCounter Delay 2.08 nsReference SourceSIMT(CNM)
Longitude100° 15 min 16.831 s WREF Delay 8.6 nsMask Angle10°
Altitude1928.65 mReceiver Delay140.3 nsReceiver Temp.32° C
Laboratory 2Observatorio NacionalID Number010Baseline7351.143 km
Latitude 22° 53 min 44.563 s SCounter Delay 0.07 nsReference SourceSIMT(ONRJ)
Longitude 43° 13 min 27.407 s WREF Delay 54.2 nsMask Angle10°
Altitude35.82 mReceiver Delay146.7 nsReceiver Temp.28 °C

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 -9.12 21.30 +1.22 x 10-13 +0.53




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 7.32 x 10-12
0 h, 20 min 140 4.51 x 10-12
0 h, 40 min 136 2.53 x 10-12
1 h, 20 min 128 1.58 x 10-12
2 h, 40 min 112 9.34 x 10-13
5 h, 20 min 80 3.50 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 2.53
0 h, 20 min 139 2.38
0 h, 40 min 133 2.25
1 h, 20 min 121 2.85
2 h, 40 min 97 3.18
5 h, 20 min 49 2.71


SIMT(CNM) - SIMT(ONRJ)
(common-view tracks from individual GPS satellites)
GPS
PRN		 Minutes
(In-View)		 Minutes
(Common-View)		 Range (ns) Time
Deviation		 Frequency Offset Confidence (r) View
Detail
1 400 160 12.27 2.19 +1.07 x 10-12 +0.83 View
2 400 40 8.89 4.94 +3.58 x 10-12 +0.66 View
3 300 10 0.00 0.00 -6.42 x 10-28 0.00 View
4 240 130 14.32 1.57 -1.61 x 10-12 -0.87 View
5 310 90 15.95 3.08 +2.09 x 10-12 +0.72 View
6 350 90 12.14 1.58 +1.16 x 10-12 +0.53 View
7 390 150 14.69 1.31 -1.51 x 10-12 -0.90 View
8 290 200 14.30 1.78 +6.29 x 10-13 +0.56 View
9 300 110 11.68 2.70 -7.86 x 10-13 -0.43 View
10 450 150 16.61 1.91 +7.27 x 10-14 +0.52 View
11 --- --- ---------- ------- -------------- ------ ----
12 290 30 2.55 0.00 +6.75 x 10-13 +0.31 View
13 420 170 15.50 1.85 +7.37 x 10-13 +0.61 View
14 400 160 14.33 1.75 -1.45 x 10-12 -0.89 View
15 320 210 9.86 1.63 +1.80 x 10-13 +0.29 View
16 310 170 13.24 1.94 +4.24 x 10-14 +0.33 View
17 410 80 8.32 1.91 -7.08 x 10-13 -0.38 View
18 360 170 21.01 2.39 -1.11 x 10-13 -0.07 View
19 380 90 10.94 2.47 -1.59 x 10-12 -0.77 View
20 290 130 15.51 1.55 +1.64 x 10-12 +0.92 View
21 300 50 6.75 0.00 +4.93 x 10-13 +0.57 View
22 290 80 15.71 2.94 +3.18 x 10-12 +0.81 View
23 460 140 20.24 2.28 -2.08 x 10-12 -0.86 View
24 420 190 19.58 1.59 +2.20 x 10-14 +0.02 View
25 280 110 20.41 3.43 -2.05 x 10-12 -0.74 View
26 220 130 27.93 2.63 +7.98 x 10-14 +0.49 View
27 380 150 19.84 1.68 +8.67 x 10-13 +0.44 View
28 --- --- ---------- ------- -------------- ------ ----
29 260 110 10.59 1.35 +1.66 x 10-12 +0.92 View
30 300 80 24.91 1.99 -2.57 x 10-12 -0.90 View
31 360 80 23.37 0.72 -4.47 x 10-12 -0.92 View
32 450 120 14.95 2.03 +5.53 x 10-14 +0.33 View


Legend
GPS PRNThe unique pseudo random noise (PRN) code (1 to 32) used to identify each satellite. If no satellite is assigned to a given PRN code, then no data are shown.
Minutes
(In-View)		The number of minutes when the satellite was visible at laboratory 1. During this period, the time difference between the satellite clock and the laboratory reference is measured every second, and 10 minute averages are stored. Since data is recorded in 10 minute segments, the values are even multiples of 10 minutes.
Minutes
(Common-View)		The number of minutes when the satellite was visible at both sites involved in the common-view comparison.
RangeThe difference between the maximum and minimum time offset values (nanoseconds).
Time
Deviation		The time deviation (TDEV) of the 10-minute averages (nanoseconds).
Frequency
Offset		The estimated frequency offset of laboratory 1 relative to laboratory 2 based on a common-view observation of the satellite. This estimate is obtained by fitting a least squares line to all of the recorded data.
Confidence
Level (r)		The confidence level of the estimated frequency offset. The confidence level is the correlation coefficient (r) of the least squares line fitted to the data.
View
Track		Clicking on the View link displays a common-view track from the selected satellite. The number of previous days shown equals the number of previous days shown on this page, up to a maximum of 30 days.