SIMT(SLBS) versus SIMT(CNM) via Common-View GPS
1 Day Averages 1 Hour Averages 10 Minute Averages Next Date Last Date Flip    

Laboratory 1St. Lucia Bureau of Standards (SLBS) ID Number021End Date2021-04-25
Latitude 14° 1 min 26.419 s NCounter Delay -2.83 nsReference SourceSIMT(SLBS)
Longitude 60° 58 min 33.714 s WREF Delay 0 nsMask Angle10°
Altitude13.49 mReceiver Delay58.1 nsReceiver Temp.38 °C
Laboratory 2Centro Nacional de MetrologiaID Number007Baseline4151.458 km
Latitude 20° 32 min 13.284 s NCounter Delay 2.09 nsReference SourceSIMT(CNM)
Longitude100° 15 min 16.831 s WREF Delay 8.6 nsMask Angle10°
Altitude1928.65 mReceiver Delay140.3 nsReceiver Temp.31° C

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 0.37 493.85 +2.03 x 10-12 +0.44




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 1.74 x 10-11
0 h, 20 min 140 2.32 x 10-11
0 h, 40 min 136 3.11 x 10-11
1 h, 20 min 128 3.27 x 10-11
2 h, 40 min 112 1.53 x 10-11
5 h, 20 min 80 8.20 x 10-12


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 6.02
0 h, 20 min 139 14.84
0 h, 40 min 133 39.47
1 h, 20 min 121 70.92
2 h, 40 min 97 68.95
5 h, 20 min 49 73.20


SIMT(SLBS) - SIMT(CNM)
(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
1 280 180 171.90 6.66 -2.41 x 10-12 -0.12 View
2 490 320 547.40 4.54 +3.82 x 10-12 +0.86 View
3 380 120 176.52 7.21 -2.43 x 10-11 -0.79 View
4 290 140 370.79 6.99 -5.13 x 10-11 -0.91 View
5 470 280 375.49 3.21 +2.44 x 10-12 +0.78 View
6 420 270 382.41 7.09 +3.60 x 10-12 +0.17 View
7 280 250 214.52 7.19 +1.32 x 10-12 +0.09 View
8 280 200 366.63 6.29 -3.47 x 10-11 -0.86 View
9 440 210 357.99 6.85 -2.62 x 10-11 -0.74 View
10 310 260 72.98 1.20 +3.93 x 10-12 +0.81 View
11 --- --- ---------- ------- -------------- ------ ----
12 390 150 371.73 5.57 +3.01 x 10-12 +0.89 View
13 340 250 340.96 2.72 +2.85 x 10-12 +0.46 View
14 320 280 385.35 9.80 +1.78 x 10-11 +0.66 View
15 360 210 215.84 3.83 +1.14 x 10-11 +0.91 View
16 390 270 309.39 6.58 +1.39 x 10-11 +0.64 View
17 330 210 288.80 4.34 +1.22 x 10-11 +0.78 View
18 310 280 94.82 1.23 +5.38 x 10-12 +0.90 View
19 260 210 223.40 6.08 -8.24 x 10-12 -0.58 View
20 370 260 262.48 2.16 +9.83 x 10-12 +0.94 View
21 240 130 182.96 7.33 +3.08 x 10-11 +0.97 View
22 340 180 286.56 7.23 +2.13 x 10-11 +0.62 View
23 290 230 85.82 2.19 +5.75 x 10-12 +0.94 View
24 260 170 55.17 1.85 +5.11 x 10-12 +0.88 View
25 240 100 15.12 2.02 -2.54 x 10-12 -0.77 View
26 400 180 266.01 11.06 +1.19 x 10-11 +0.79 View
27 270 240 348.32 5.19 -1.55 x 10-11 -0.75 View
28 240 160 216.74 6.19 -1.15 x 10-11 -0.44 View
29 340 160 24.61 1.14 +1.92 x 10-12 +0.79 View
30 330 130 365.61 10.04 +3.94 x 10-11 +0.83 View
31 460 300 314.57 4.87 +1.27 x 10-11 +0.72 View
32 400 300 124.04 2.27 +4.60 x 10-12 +0.93 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.