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

Laboratory 1Antigua and Barbuda Bureau of StandardsID Number023End Date2021-04-23
Latitude 17° 7 min 34.395 s NCounter Delay 0.36 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
Laboratory 2National Research CouncilID Number008Baseline3353.438 km
Latitude 45° 27 min 14.853 s NCounter Delay 0.70 nsReference SourceSIMT(NRC)
Longitude 75° 37 min 25.777 s WREF Delay 38 nsMask Angle10°
Altitude82.59 mReceiver Delay229.3 nsReceiver Temp.33 °C

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 23.11 12.71 -5.64 x 10-14 -0.40




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 4.17 x 10-12
0 h, 20 min 140 2.14 x 10-12
0 h, 40 min 136 1.51 x 10-12
1 h, 20 min 128 1.16 x 10-12
2 h, 40 min 112 5.25 x 10-13
5 h, 20 min 80 2.69 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 1.44
0 h, 20 min 139 1.13
0 h, 40 min 133 1.55
1 h, 20 min 121 2.24
2 h, 40 min 97 1.88
5 h, 20 min 49 2.40


SIMT(ABBS) - SIMT(NRC)
(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
1 310 240 27.55 0.84 -2.13 x 10-12 -0.97 View
2 470 390 17.29 1.60 -6.08 x 10-14 -0.59 View
3 440 290 17.78 2.87 +1.39 x 10-15 0.00 View
4 300 210 30.31 1.30 -3.35 x 10-13 -0.32 View
5 430 330 18.46 1.94 -4.91 x 10-14 -0.20 View
6 460 360 12.47 1.45 +4.24 x 10-14 +0.53 View
7 270 200 18.68 1.38 +1.64 x 10-12 +0.89 View
8 290 280 35.13 0.70 -1.92 x 10-12 -0.89 View
9 390 270 28.79 4.70 -6.94 x 10-14 -0.17 View
10 330 250 23.88 1.59 +1.36 x 10-12 +0.86 View
11 --- --- ---------- ------- -------------- ------ ----
12 450 310 20.46 3.25 +3.85 x 10-15 +0.03 View
13 330 270 26.62 1.12 -1.73 x 10-12 -0.86 View
14 240 160 11.40 2.42 +5.56 x 10-13 +0.45 View
15 400 340 26.80 1.07 -9.81 x 10-13 -0.86 View
16 370 270 20.51 1.30 -7.86 x 10-13 -0.87 View
17 400 220 17.85 1.44 +7.16 x 10-13 +0.76 View
18 320 240 17.88 1.48 +1.08 x 10-12 +0.78 View
19 350 280 22.29 1.72 +7.87 x 10-14 +0.24 View
20 400 330 13.83 0.98 +3.33 x 10-13 +0.50 View
21 300 130 26.67 1.39 -1.88 x 10-12 -0.91 View
22 390 180 18.68 2.84 -3.34 x 10-13 -0.71 View
23 300 190 16.68 1.46 +9.72 x 10-14 +0.07 View
24 250 140 17.09 1.78 -6.41 x 10-13 -0.53 View
25 300 130 22.98 3.33 -1.34 x 10-12 -0.89 View
26 430 340 34.36 3.27 -1.30 x 10-12 -0.87 View
27 300 230 28.91 1.03 -2.12 x 10-12 -0.84 View
28 270 110 26.38 1.14 +9.71 x 10-13 +0.54 View
29 330 180 17.11 3.83 -7.70 x 10-14 -0.20 View
30 270 210 28.40 2.50 +1.60 x 10-13 +0.53 View
31 440 360 16.87 0.99 -2.90 x 10-13 -0.36 View
32 370 290 21.25 1.74 +8.12 x 10-13 +0.76 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.