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 Date2021-04-25
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 2INDOCAL Dominican RepublicID Number029Baseline868.022 km
Latitude 18° 27 min 57.917 s NCounter Delay 0.59 nsReference SourceSIMT(INDC)
Longitude 69° 53 min 44.116 s WREF Delay 0 nsMask Angle10°
Altitude1.44 mReceiver Delay11.3 nsReceiver Temp.28 °C

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 1.38 64.91 -5.05 x 10-13 -0.75




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 2.77 x 10-12
0 h, 20 min 140 1.81 x 10-12
0 h, 40 min 136 1.65 x 10-12
1 h, 20 min 128 1.87 x 10-12
2 h, 40 min 112 1.37 x 10-12
5 h, 20 min 80 7.58 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 0.96
0 h, 20 min 139 1.02
0 h, 40 min 133 1.88
1 h, 20 min 121 4.59
2 h, 40 min 97 5.69
5 h, 20 min 49 5.01


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
1 310 290 26.69 1.61 -1.35 x 10-12 -0.73 View
2 470 460 71.74 1.43 -4.30 x 10-13 -0.73 View
3 440 380 43.33 3.20 -8.46 x 10-13 -0.87 View
4 310 260 14.94 1.30 -4.07 x 10-13 -0.52 View
5 440 410 50.30 1.83 -2.41 x 10-13 -0.71 View
6 460 430 75.15 1.50 -5.83 x 10-13 -0.74 View
7 270 260 28.89 1.10 -2.13 x 10-12 -0.92 View
8 290 270 16.10 1.16 -3.06 x 10-13 -0.39 View
9 410 310 51.69 4.36 +4.20 x 10-13 +0.44 View
10 320 320 22.46 2.03 +3.27 x 10-13 +0.31 View
11 --- --- ---------- ------- -------------- ------ ----
12 450 380 37.62 3.37 -1.36 x 10-13 -0.33 View
13 330 310 29.04 1.22 -3.45 x 10-14 -0.09 View
14 270 250 29.95 1.60 +1.33 x 10-12 +0.77 View
15 360 340 30.64 1.91 -8.51 x 10-14 -0.08 View
16 360 290 24.40 1.28 -1.08 x 10-12 -0.80 View
17 350 260 75.38 1.97 -8.02 x 10-14 -0.06 View
18 320 310 19.17 1.87 -6.74 x 10-13 -0.72 View
19 330 280 62.48 1.96 -2.11 x 10-13 -0.17 View
20 390 360 19.63 1.49 -3.18 x 10-13 -0.39 View
21 300 280 24.60 1.51 -1.39 x 10-12 -0.81 View
22 380 350 58.55 1.65 -1.24 x 10-12 -0.94 View
23 310 230 13.83 0.78 -5.66 x 10-13 -0.69 View
24 260 230 12.54 0.95 +3.59 x 10-13 +0.46 View
25 290 270 18.89 1.79 +3.74 x 10-13 +0.36 View
26 420 380 27.83 2.94 -7.19 x 10-13 -0.70 View
27 310 310 23.84 1.01 -6.89 x 10-13 -0.53 View
28 270 250 45.51 2.13 +1.82 x 10-12 +0.80 View
29 370 320 33.50 3.80 +6.13 x 10-15 +0.01 View
30 210 90 25.80 2.20 -1.65 x 10-12 -0.86 View
31 450 400 22.80 1.89 +1.72 x 10-13 +0.19 View
32 360 330 22.20 1.30 +3.50 x 10-13 +0.39 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.