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

Laboratory 1Observatorio NacionalID Number010End Date2021-04-25
Latitude 22° 53 min 44.563 s SCounter Delay 0.13 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
Laboratory 2Antigua and Barbuda Bureau of StandardsID Number023Baseline4749.702 km
Latitude 17° 7 min 34.395 s NCounter Delay 0.39 nsReference SourceSIMT(ABBS)
Longitude 61° 49 min 18.409 s WREF Delay 1.7 nsMask Angle10°
Altitude5.50 mReceiver Delay130.7 nsReceiver Temp.33 °C

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 8.59 23.45 +1.35 x 10-13 +0.52




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 6.24 x 10-12
0 h, 20 min 140 3.48 x 10-12
0 h, 40 min 136 2.48 x 10-12
1 h, 20 min 128 1.93 x 10-12
2 h, 40 min 112 1.25 x 10-12
5 h, 20 min 80 2.99 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 2.16
0 h, 20 min 139 1.86
0 h, 40 min 133 2.64
1 h, 20 min 121 4.14
2 h, 40 min 97 4.43
5 h, 20 min 49 1.27


SIMT(ONRJ) - SIMT(ABBS)
(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
1 300 200 25.21 1.22 -1.21 x 10-12 -0.61 View
2 290 170 29.00 0.89 +3.08 x 10-12 +0.99 View
3 360 200 16.63 1.02 -1.37 x 10-12 -0.83 View
4 440 150 18.34 2.20 +1.83 x 10-12 +0.83 View
5 440 210 30.36 3.33 +1.91 x 10-13 +0.66 View
6 370 210 20.82 2.13 +4.37 x 10-14 +0.20 View
7 430 150 22.86 1.07 +2.87 x 10-12 +0.97 View
8 420 140 24.36 1.20 -2.98 x 10-12 -0.91 View
9 440 220 19.92 2.47 +2.39 x 10-13 +0.44 View
10 370 180 40.32 1.74 +3.46 x 10-12 +0.93 View
11 --- --- ---------- ------- -------------- ------ ----
12 360 160 16.29 1.06 -2.52 x 10-13 -0.23 View
13 290 210 37.97 0.96 +3.20 x 10-13 +0.74 View
14 350 210 35.74 1.61 +2.34 x 10-12 +0.81 View
15 350 160 34.81 1.57 -2.67 x 10-12 -0.91 View
16 350 160 17.64 2.20 -1.31 x 10-12 -0.72 View
17 270 110 24.12 2.13 +5.48 x 10-15 +0.03 View
18 420 200 34.80 2.75 +3.02 x 10-12 +0.96 View
19 330 170 15.60 0.91 +1.02 x 10-14 +0.10 View
20 320 210 35.63 1.66 +1.33 x 10-12 +0.72 View
21 260 180 27.84 1.54 -3.16 x 10-12 -0.98 View
22 370 200 10.67 2.26 -1.01 x 10-13 -0.31 View
23 370 220 26.38 1.62 +1.89 x 10-12 +0.87 View
24 200 170 18.91 0.92 -1.59 x 10-12 -0.79 View
25 320 180 34.61 1.06 -3.15 x 10-12 -0.97 View
26 390 150 27.96 2.42 +5.29 x 10-13 +0.50 View
27 280 210 22.40 1.30 -1.43 x 10-12 -0.94 View
28 410 210 41.35 2.35 +3.23 x 10-12 +0.90 View
29 320 170 27.25 4.23 +6.72 x 10-13 +0.76 View
30 290 60 8.81 2.64 -2.49 x 10-14 -0.20 View
31 340 160 9.87 1.92 +2.87 x 10-13 +0.71 View
32 310 180 37.77 1.05 +3.10 x 10-12 +0.97 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.