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 Date2021-09-12
Latitude 17° 7 min 34.395 s NCounter Delay 0.34 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 0.17 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 -34.70 28.32 -9.54 x 10-14 -0.34




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 5.77 x 10-12
0 h, 20 min 140 3.25 x 10-12
0 h, 40 min 136 2.34 x 10-12
1 h, 20 min 128 2.23 x 10-12
2 h, 40 min 112 1.59 x 10-12
5 h, 20 min 80 3.45 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 2.00
0 h, 20 min 139 1.74
0 h, 40 min 133 2.44
1 h, 20 min 121 5.22
2 h, 40 min 97 5.44
5 h, 20 min 49 2.02


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 36.68 1.01 +3.32 x 10-12 +0.91 View
2 470 150 22.93 1.45 -1.09 x 10-12 -0.41 View
3 430 200 14.97 1.74 -6.44 x 10-13 -0.55 View
4 340 170 32.34 2.77 -1.12 x 10-12 -0.96 View
5 470 230 49.93 2.56 +2.37 x 10-13 +0.21 View
6 340 190 7.15 2.23 +6.07 x 10-14 +0.35 View
7 300 180 47.94 1.53 -5.08 x 10-12 -0.99 View
8 310 140 8.47 2.16 +6.42 x 10-13 +0.70 View
9 410 220 24.86 2.03 -4.02 x 10-13 -0.45 View
10 340 200 10.78 2.11 -1.64 x 10-14 -0.23 View
11 --- --- ---------- ------- -------------- ------ ----
12 430 170 44.48 0.81 -1.15 x 10-12 -0.48 View
13 340 220 19.44 1.51 +9.38 x 10-13 +0.56 View
14 340 210 25.90 1.95 -1.40 x 10-12 -0.76 View
15 420 190 39.24 1.27 -9.91 x 10-13 -0.34 View
16 430 160 23.03 2.09 +2.83 x 10-12 +0.93 View
17 340 190 26.55 2.10 -1.96 x 10-12 -0.82 View
18 320 200 46.85 2.27 -1.05 x 10-12 -0.27 View
19 360 180 21.92 1.45 -2.23 x 10-12 -0.94 View
20 350 220 34.05 2.35 -6.93 x 10-13 -0.62 View
21 270 140 34.29 1.29 +3.75 x 10-12 +0.98 View
22 340 120 19.61 1.76 -5.82 x 10-14 -0.09 View
23 330 210 35.13 0.95 -7.73 x 10-15 -0.02 View
24 300 190 26.26 0.81 +2.30 x 10-12 +0.94 View
25 230 150 26.57 1.02 -3.32 x 10-12 -0.99 View
26 420 200 37.02 2.79 -2.85 x 10-13 -0.92 View
27 300 170 15.41 1.47 +9.50 x 10-13 +0.61 View
28 --- --- ---------- ------- -------------- ------ ----
29 410 200 40.76 2.25 -5.70 x 10-14 -0.18 View
30 270 100 25.00 0.87 -5.69 x 10-13 -0.75 View
31 430 160 35.86 4.39 -1.66 x 10-13 -0.24 View
32 450 210 22.42 0.99 -2.19 x 10-13 -0.62 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.