SIMT(ABBS) versus SIMT(ONRJ) 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 Date2021-09-14
Latitude 17° 7 min 34.395 s NCounter Delay 0.40 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 2Observatorio NacionalID Number010Baseline4749.702 km
Latitude 22° 53 min 44.563 s SCounter Delay 0.09 nsReference SourceSIMT(ONRJ)
Longitude 43° 13 min 27.407 s WREF Delay 54.2 nsMask Angle10°
Altitude35.82 mReceiver Delay146.7 nsReceiver Temp.28 °C

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 -29.32 31.48 -4.46 x 10-15 -0.01




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 5.56 x 10-12
0 h, 20 min 140 3.37 x 10-12
0 h, 40 min 136 2.52 x 10-12
1 h, 20 min 128 2.59 x 10-12
2 h, 40 min 112 1.85 x 10-12
5 h, 20 min 80 3.62 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 1.92
0 h, 20 min 139 1.86
0 h, 40 min 133 2.85
1 h, 20 min 121 6.07
2 h, 40 min 97 5.93
5 h, 20 min 49 2.80


SIMT(ABBS) - SIMT(ONRJ)
(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
1 320 200 30.01 0.85 +2.93 x 10-12 +0.93 View
2 480 160 37.36 1.99 -4.28 x 10-12 -0.97 View
3 440 190 24.17 1.59 +1.60 x 10-12 +0.88 View
4 330 160 32.22 2.32 -8.91 x 10-13 -0.76 View
5 470 230 50.12 2.59 +2.55 x 10-13 +0.20 View
6 340 190 19.67 2.59 +2.18 x 10-13 +0.39 View
7 310 190 35.74 1.88 -3.36 x 10-12 -0.98 View
8 310 140 8.56 2.41 -7.04 x 10-13 -0.65 View
9 400 210 15.16 1.72 -1.17 x 10-13 -0.21 View
10 330 200 22.25 1.66 +1.05 x 10-13 +0.69 View
11 --- --- ---------- ------- -------------- ------ ----
12 430 160 26.00 1.10 +2.43 x 10-14 +0.02 View
13 340 230 41.51 1.72 +9.62 x 10-13 +0.34 View
14 340 210 39.92 2.03 -3.15 x 10-12 -0.95 View
15 420 190 27.83 1.78 -3.25 x 10-13 -0.14 View
16 430 150 42.14 2.72 -2.37 x 10-13 -0.34 View
17 340 190 15.01 1.48 -1.15 x 10-12 -0.87 View
18 320 200 36.31 1.84 -1.49 x 10-12 -0.44 View
19 370 190 17.45 1.03 -1.28 x 10-12 -0.84 View
20 350 220 46.04 2.59 -9.64 x 10-13 -0.68 View
21 270 140 24.49 0.86 +2.32 x 10-12 +0.96 View
22 340 120 24.70 2.20 -3.77 x 10-13 -0.54 View
23 320 210 45.46 0.82 +8.69 x 10-14 +0.10 View
24 300 200 35.54 1.45 +3.15 x 10-12 +0.95 View
25 240 160 31.21 0.71 -2.63 x 10-12 -0.99 View
26 410 200 39.71 2.66 -2.96 x 10-13 -0.86 View
27 300 170 16.36 0.87 +1.25 x 10-12 +0.68 View
28 --- --- ---------- ------- -------------- ------ ----
29 420 210 42.82 1.73 -3.53 x 10-14 -0.11 View
30 280 100 14.37 0.66 -3.34 x 10-13 -0.79 View
31 430 160 41.72 1.48 -3.86 x 10-14 -0.05 View
32 440 210 18.71 1.43 -8.85 x 10-14 -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.