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 Date2021-04-25
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
Laboratory 2National Research CouncilID Number008Baseline3353.438 km
Latitude 45° 27 min 14.853 s NCounter Delay 0.65 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 28.55 24.17 -1.06 x 10-13 -0.51




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 4.75 x 10-12
0 h, 20 min 140 2.81 x 10-12
0 h, 40 min 136 1.74 x 10-12
1 h, 20 min 128 1.32 x 10-12
2 h, 40 min 112 9.94 x 10-13
5 h, 20 min 80 2.44 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 1.64
0 h, 20 min 139 1.49
0 h, 40 min 133 1.74
1 h, 20 min 121 2.90
2 h, 40 min 97 3.89
5 h, 20 min 49 1.37


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
1 310 200 35.07 0.81 -2.69 x 10-12 -0.97 View
2 470 390 24.78 1.53 -1.55 x 10-13 -0.81 View
3 440 300 20.15 3.51 +6.52 x 10-14 +0.15 View
4 310 220 28.46 1.53 -3.20 x 10-13 -0.37 View
5 440 320 17.94 1.79 -1.54 x 10-13 -0.87 View
6 460 360 23.77 1.21 -2.82 x 10-14 -0.13 View
7 270 200 17.52 1.01 +1.12 x 10-12 +0.70 View
8 290 280 32.74 1.09 -1.30 x 10-12 -0.71 View
9 410 270 37.53 4.68 -6.04 x 10-13 -0.84 View
10 320 250 27.92 1.89 +1.95 x 10-12 +0.93 View
11 --- --- ---------- ------- -------------- ------ ----
12 450 310 20.23 2.70 -1.55 x 10-13 -0.75 View
13 330 270 17.05 1.86 -5.20 x 10-13 -0.47 View
14 270 200 65.12 9.96 +2.28 x 10-12 +0.75 View
15 360 340 35.74 1.32 -9.63 x 10-13 -0.56 View
16 360 280 23.75 1.24 -1.11 x 10-12 -0.88 View
17 350 200 22.06 2.02 +5.75 x 10-13 +0.48 View
18 320 230 24.11 1.36 -5.50 x 10-13 -0.35 View
19 330 280 15.74 1.88 +7.98 x 10-14 +0.26 View
20 390 300 19.87 1.45 -1.77 x 10-13 -0.18 View
21 300 140 35.09 1.68 -2.47 x 10-12 -0.91 View
22 380 200 33.51 2.69 -4.87 x 10-13 -0.72 View
23 310 190 10.34 1.98 +5.44 x 10-13 +0.63 View
24 260 150 28.87 1.08 -2.30 x 10-12 -0.94 View
25 290 130 21.09 2.68 -1.01 x 10-12 -0.69 View
26 420 330 30.00 2.47 -1.57 x 10-12 -0.91 View
27 310 230 19.62 1.03 -1.23 x 10-12 -0.86 View
28 270 110 28.77 1.67 +1.30 x 10-12 +0.62 View
29 370 220 18.85 2.68 -1.98 x 10-13 -0.58 View
30 210 150 29.25 4.11 +2.02 x 10-13 +0.64 View
31 450 370 21.17 1.30 -5.83 x 10-13 -0.58 View
32 360 280 27.44 2.35 +1.02 x 10-12 +0.82 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.