SIMT(ABBS) versus SIMT(INDC) 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 2INDOCAL Dominican RepublicID Number029Baseline868.022 km
Latitude 18° 27 min 57.917 s NCounter Delay 0.39 nsReference SourceSIMT(INDC)
Longitude 69° 53 min 44.116 s WREF Delay 0 nsMask Angle10°
Altitude1.44 mReceiver Delay11.3 nsReceiver Temp.29 °C

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 -3.28 73.95 -3.53 x 10-14 -0.05




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 3.15 x 10-12
0 h, 20 min 140 2.31 x 10-12
0 h, 40 min 136 2.15 x 10-12
1 h, 20 min 128 2.68 x 10-12
2 h, 40 min 112 2.62 x 10-12
5 h, 20 min 80 9.82 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 1.09
0 h, 20 min 139 1.33
0 h, 40 min 133 2.57
1 h, 20 min 121 6.75
2 h, 40 min 97 9.97
5 h, 20 min 49 8.32


SIMT(ABBS) - SIMT(INDC)
(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 18.08 1.70 +8.90 x 10-13 +0.79 View
2 470 460 75.15 1.48 +2.05 x 10-13 +0.32 View
3 440 380 19.27 2.09 -2.65 x 10-13 -0.66 View
4 300 260 27.61 1.61 -1.66 x 10-12 -0.89 View
5 430 400 77.72 2.42 +4.37 x 10-13 +0.60 View
6 460 430 75.97 1.93 +2.58 x 10-13 +0.37 View
7 270 250 20.93 1.23 +1.20 x 10-12 +0.87 View
8 290 270 28.71 0.99 -1.52 x 10-14 -0.01 View
9 390 280 104.90 4.18 +2.08 x 10-12 +0.89 View
10 330 320 30.65 1.72 +1.71 x 10-12 +0.88 View
11 --- --- ---------- ------- -------------- ------ ----
12 450 380 84.20 3.06 +8.03 x 10-13 +0.92 View
13 330 310 71.75 1.34 +7.18 x 10-13 +0.65 View
14 240 240 53.31 1.62 +3.88 x 10-12 +0.91 View
15 400 370 50.47 2.54 +1.06 x 10-12 +0.42 View
16 370 290 36.87 1.65 -1.41 x 10-12 -0.91 View
17 400 320 72.46 1.82 +4.30 x 10-13 +0.36 View
18 320 320 47.58 2.30 -2.25 x 10-12 -0.78 View
19 350 280 75.51 2.01 +4.61 x 10-13 +0.37 View
20 400 360 42.29 1.23 -1.79 x 10-12 -0.79 View
21 300 280 22.34 1.58 +4.73 x 10-13 +0.35 View
22 390 360 39.69 2.37 -5.21 x 10-13 -0.76 View
23 300 230 33.00 1.24 +2.71 x 10-13 +0.16 View
24 250 240 34.02 1.43 -1.48 x 10-12 -0.71 View
25 300 280 36.70 2.25 +2.16 x 10-12 +0.91 View
26 430 380 36.10 1.98 -1.23 x 10-12 -0.92 View
27 300 300 29.72 1.24 -1.58 x 10-12 -0.93 View
28 270 250 55.72 1.15 +3.32 x 10-12 +0.84 View
29 330 270 49.70 5.39 -3.75 x 10-13 -0.42 View
30 270 100 8.28 0.94 -2.63 x 10-13 -0.37 View
31 440 390 26.84 1.64 +2.70 x 10-14 +0.03 View
32 370 330 35.82 1.34 +6.10 x 10-13 +0.43 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.