SIMT(ABBS) versus SIMT(INTI) 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 Date2021-04-24
Latitude 17° 7 min 34.395 s NCounter Delay 0.25 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 2Instituto Nacional de Tecnologia Industrial, Buenos Aires, Argentina ID Number014Baseline5539.294 km
Latitude 34° 34 min 35.819 s SCounter Delay 0.04 nsReference SourceSIMT(INTI)
Longitude 58° 30 min 56.613 s WREF Delay 5 nsMask Angle10°
Altitude43.59 mReceiver Delay124.6 nsReceiver Temp.25 °C

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 114.96 17.89 +2.39 x 10-14 +0.10




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 7.83 x 10-12
0 h, 20 min 140 4.48 x 10-12
0 h, 40 min 136 3.11 x 10-12
1 h, 20 min 128 2.56 x 10-12
2 h, 40 min 112 1.05 x 10-12
5 h, 20 min 80 4.76 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 2.71
0 h, 20 min 139 2.41
0 h, 40 min 133 3.29
1 h, 20 min 121 5.06
2 h, 40 min 97 3.92
5 h, 20 min 49 2.82


SIMT(ABBS) - SIMT(INTI)
(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
1 320 180 37.51 1.98 +3.73 x 10-12 +0.94 View
2 470 150 43.16 1.48 -4.78 x 10-12 -0.98 View
3 420 170 28.04 1.12 +1.08 x 10-12 +0.88 View
4 300 160 23.34 2.47 -1.91 x 10-12 -0.75 View
5 440 110 30.90 3.78 +3.15 x 10-13 +0.86 View
6 430 80 13.80 3.33 -4.53 x 10-14 -0.28 View
7 270 140 40.15 0.79 -5.75 x 10-12 -0.96 View
8 290 110 26.88 1.72 +4.25 x 10-12 +0.91 View
9 410 150 21.69 2.10 +8.05 x 10-14 +0.12 View
10 340 180 31.04 1.57 -2.86 x 10-12 -0.93 View
11 --- --- ---------- ------- -------------- ------ ----
12 460 220 28.75 1.51 -3.63 x 10-13 -0.37 View
13 330 180 41.25 1.88 -1.83 x 10-13 -0.38 View
14 270 190 38.33 1.43 -3.57 x 10-12 -0.96 View
15 400 160 36.89 3.55 +3.14 x 10-12 +0.82 View
16 350 140 36.57 3.15 +2.86 x 10-12 +0.63 View
17 370 30 6.12 0.00 -5.10 x 10-12 -0.90 View
18 320 180 23.74 1.50 -2.12 x 10-12 -0.87 View
19 350 150 28.26 1.54 +1.66 x 10-13 +0.87 View
20 360 140 21.31 1.04 -2.06 x 10-12 -0.94 View
21 300 180 30.94 1.36 +3.45 x 10-12 +0.96 View
22 390 90 13.24 1.91 -1.02 x 10-12 -0.41 View
23 290 150 31.54 1.16 -4.09 x 10-12 -0.97 View
24 250 180 29.60 1.77 +1.84 x 10-12 +0.81 View
25 310 180 35.53 1.33 +3.78 x 10-12 +0.97 View
26 420 140 27.14 1.39 +3.86 x 10-12 +0.93 View
27 300 140 20.49 1.65 +2.33 x 10-12 +0.90 View
28 280 160 46.00 1.56 -4.67 x 10-12 -0.94 View
29 380 130 31.56 3.70 -1.45 x 10-12 -0.86 View
30 230 50 4.71 1.90 -1.58 x 10-12 -0.71 View
31 430 110 19.31 1.98 -4.45 x 10-13 -0.82 View
32 360 150 30.56 1.19 -3.47 x 10-12 -0.97 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.