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 Date2021-04-23
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 2St. Lucia Bureau of Standards (SLBS) ID Number021Baseline355.009 km
Latitude 14° 1 min 26.419 s NCounter Delay -0.26 nsReference SourceSIMT(SLBS)
Longitude 60° 58 min 33.714 s WREF Delay 0 nsMask Angle10°
Altitude13.49 mReceiver Delay58.1 nsReceiver Temp.36 °C

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 -5.94 561.00 +2.57 x 10-13 +0.05




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 1.70 x 10-11
0 h, 20 min 140 2.17 x 10-11
0 h, 40 min 136 2.22 x 10-11
1 h, 20 min 128 2.83 x 10-11
2 h, 40 min 112 2.36 x 10-11
5 h, 20 min 80 1.28 x 10-11


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 5.88
0 h, 20 min 139 13.25
0 h, 40 min 133 26.93
1 h, 20 min 121 71.37
2 h, 40 min 97 106.23
5 h, 20 min 49 127.18


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
1 310 280 410.34 10.06 -4.49 x 10-12 -0.22 View
2 470 470 270.98 6.00 -7.28 x 10-13 -0.35 View
3 440 380 372.92 4.11 -8.26 x 10-12 -0.88 View
4 300 270 456.67 9.29 -2.11 x 10-11 -0.67 View
5 430 430 512.25 6.27 +4.66 x 10-14 +0.01 View
6 460 430 297.73 5.80 -1.12 x 10-12 -0.47 View
7 270 270 417.01 10.09 -5.53 x 10-12 -0.25 View
8 290 280 454.49 9.88 -2.91 x 10-11 -0.84 View
9 390 370 479.03 11.04 -4.90 x 10-12 -0.46 View
10 330 310 371.57 3.74 +1.93 x 10-11 +0.93 View
11 --- --- ---------- ------- -------------- ------ ----
12 450 370 452.83 8.38 +1.62 x 10-13 +0.03 View
13 330 320 369.32 5.49 -1.49 x 10-12 -0.28 View
14 240 230 168.60 2.17 +1.05 x 10-11 +0.78 View
15 400 360 498.55 3.80 -2.41 x 10-11 -0.88 View
16 370 330 470.72 5.34 +6.11 x 10-13 +0.03 View
17 400 320 188.13 5.62 -2.52 x 10-13 -0.14 View
18 320 310 444.49 4.17 -4.89 x 10-12 -0.21 View
19 350 310 185.51 7.19 -1.63 x 10-13 -0.10 View
20 400 350 528.39 3.97 -1.70 x 10-11 -0.69 View
21 300 240 488.70 5.62 -1.74 x 10-11 -0.56 View
22 390 350 347.54 4.76 -5.85 x 10-12 -0.76 View
23 300 280 335.98 4.36 +1.89 x 10-11 +0.91 View
24 250 250 525.93 4.85 -2.16 x 10-11 -0.69 View
25 300 240 336.32 3.67 +2.27 x 10-11 +0.95 View
26 430 400 284.11 5.07 +1.30 x 10-11 +0.89 View
27 300 250 209.19 2.81 +1.22 x 10-11 +0.76 View
28 270 240 188.93 3.11 +3.20 x 10-12 +0.27 View
29 330 320 410.36 6.61 +5.19 x 10-12 +0.52 View
30 270 190 328.24 3.41 -3.22 x 10-12 -0.89 View
31 440 440 395.20 4.72 +1.32 x 10-11 +0.97 View
32 370 360 446.91 5.15 +1.47 x 10-11 +0.92 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.