SIMT(ABBS) versus SIMT(SLBS) 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 2St. Lucia Bureau of Standards (SLBS) ID Number021Baseline355.009 km
Latitude 14° 1 min 26.419 s NCounter Delay -2.83 nsReference SourceSIMT(SLBS)
Longitude 60° 58 min 33.714 s WREF Delay 0 nsMask Angle10°
Altitude13.49 mReceiver Delay58.1 nsReceiver Temp.38 °C

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 9.09 490.15 -2.06 x 10-12 -0.45




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 1.65 x 10-11
0 h, 20 min 140 2.27 x 10-11
0 h, 40 min 136 3.08 x 10-11
1 h, 20 min 128 3.22 x 10-11
2 h, 40 min 112 1.56 x 10-11
5 h, 20 min 80 8.21 x 10-12


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 5.71
0 h, 20 min 139 14.61
0 h, 40 min 133 39.04
1 h, 20 min 121 69.94
2 h, 40 min 97 71.73
5 h, 20 min 49 72.01


SIMT(ABBS) - SIMT(SLBS)
(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
1 310 280 201.19 6.78 +1.43 x 10-12 +0.10 View
2 470 470 560.93 3.08 -2.93 x 10-12 -0.79 View
3 440 380 402.98 9.84 +4.80 x 10-12 +0.45 View
4 310 270 414.39 6.19 +2.62 x 10-11 +0.86 View
5 440 440 381.34 3.35 -2.26 x 10-12 -0.72 View
6 460 410 572.66 5.99 -3.56 x 10-12 -0.78 View
7 270 270 210.56 7.28 -7.54 x 10-13 -0.05 View
8 290 280 372.96 7.34 +1.64 x 10-11 +0.64 View
9 410 390 396.36 7.55 -1.03 x 10-12 -0.12 View
10 320 310 48.38 2.52 -6.81 x 10-13 -0.28 View
11 --- --- ---------- ------- -------------- ------ ----
12 450 370 371.11 3.16 -2.76 x 10-12 -0.61 View
13 330 320 348.38 2.84 -2.19 x 10-12 -0.54 View
14 270 260 382.95 10.53 -8.25 x 10-12 -0.37 View
15 360 340 152.32 2.48 -5.06 x 10-12 -0.92 View
16 360 320 456.83 7.68 +8.84 x 10-13 +0.05 View
17 350 260 460.10 6.79 -4.20 x 10-12 -0.87 View
18 320 310 96.12 2.59 -4.81 x 10-12 -0.89 View
19 330 260 558.76 6.18 -4.67 x 10-12 -0.86 View
20 390 330 253.60 1.91 -6.67 x 10-12 -0.90 View
21 300 240 348.90 6.85 +1.35 x 10-11 +0.60 View
22 380 300 403.32 9.94 +5.89 x 10-12 +0.59 View
23 310 280 67.71 0.88 -2.08 x 10-12 -0.57 View
24 260 240 90.94 1.71 -4.68 x 10-12 -0.87 View
25 290 230 42.38 1.84 +9.80 x 10-13 +0.40 View
26 420 400 349.83 6.22 -6.02 x 10-12 -0.41 View
27 310 250 354.22 6.02 +1.34 x 10-11 +0.68 View
28 270 240 375.14 7.02 -7.37 x 10-12 -0.36 View
29 370 310 319.28 5.11 -4.82 x 10-12 -0.69 View
30 210 170 154.74 9.59 -5.63 x 10-13 -0.41 View
31 450 450 291.34 5.68 -9.83 x 10-12 -0.77 View
32 360 340 297.87 4.91 -1.23 x 10-11 -0.77 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.