SIMT(ABBS) versus SIMT(IBM) 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 Date2021-09-13
Latitude 17° 7 min 34.395 s NCounter Delay 0.24 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 2IBMETRO Bolivia ID Number025Baseline3728.334 km
Latitude 16° 30 min 1.070 s SCounter Delay 0.01 nsReference SourceSIMT(IBM)
Longitude 68° 7 min 56.998 s WREF Delay 2.9 nsMask Angle10°
Altitude3648.75 mReceiver Delay103.0 nsReceiver Temp.41 °C

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 58.74 22.79 -2.53 x 10-14 -0.11




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 6.71 x 10-12
0 h, 20 min 140 4.36 x 10-12
0 h, 40 min 136 3.05 x 10-12
1 h, 20 min 128 2.54 x 10-12
2 h, 40 min 112 1.30 x 10-12
5 h, 20 min 80 3.85 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 2.33
0 h, 20 min 139 2.40
0 h, 40 min 133 3.26
1 h, 20 min 121 5.41
2 h, 40 min 97 4.37
5 h, 20 min 49 1.85


SIMT(ABBS) - SIMT(IBM)
(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
1 320 220 24.94 2.17 +1.39 x 10-12 +0.76 View
2 480 160 33.17 3.17 -5.37 x 10-13 -0.44 View
3 430 100 15.84 2.90 +5.50 x 10-13 +0.73 View
4 320 190 11.13 1.55 -2.11 x 10-13 -0.28 View
5 460 150 17.79 4.35 +1.03 x 10-12 +0.56 View
6 340 120 41.29 4.26 +4.51 x 10-12 +0.89 View
7 310 220 36.82 1.64 -3.09 x 10-12 -0.92 View
8 310 160 29.00 1.94 +3.44 x 10-12 +0.98 View
9 430 140 30.89 3.86 -2.56 x 10-13 -0.23 View
10 330 200 35.97 1.91 +1.48 x 10-13 +0.55 View
11 --- --- ---------- ------- -------------- ------ ----
12 420 100 21.60 3.82 +6.05 x 10-13 +0.65 View
13 340 230 43.07 2.92 +3.25 x 10-12 +0.93 View
14 340 240 42.22 1.67 -2.81 x 10-12 -0.98 View
15 420 230 36.98 1.24 +3.11 x 10-12 +0.88 View
16 430 200 37.47 2.20 -2.75 x 10-13 -0.59 View
17 300 80 39.15 5.93 -3.53 x 10-12 -0.96 View
18 320 220 21.83 2.07 -1.70 x 10-12 -0.95 View
19 370 140 49.97 3.32 -4.40 x 10-12 -0.95 View
20 360 210 25.09 1.91 +2.00 x 10-12 +0.91 View
21 260 170 34.83 1.43 +3.15 x 10-12 +0.97 View
22 370 60 8.37 4.56 +1.84 x 10-13 +0.43 View
23 330 240 46.79 1.88 -3.17 x 10-14 -0.05 View
24 290 150 24.82 1.00 +2.29 x 10-12 +0.89 View
25 250 130 26.33 4.64 +1.70 x 10-12 +0.69 View
26 420 230 42.19 1.55 -2.97 x 10-13 -0.85 View
27 300 210 20.96 1.04 +1.44 x 10-12 +0.83 View
28 --- --- ---------- ------- -------------- ------ ----
29 440 150 32.27 1.69 -3.40 x 10-12 -0.83 View
30 250 110 12.28 2.12 -1.48 x 10-12 -0.85 View
31 430 70 7.19 3.43 +4.68 x 10-13 +0.33 View
32 450 200 31.79 2.53 +4.24 x 10-14 +0.11 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.