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 Date2021-04-23
Latitude 14° 1 min 26.419 s NCounter Delay -0.26 nsReference SourceSIMT(SLBS)
Longitude 60° 58 min 33.714 s WREF Delay 0 nsMask Angle10°
Altitude13.49 mReceiver Delay58.1 nsReceiver Temp.36 °C
Laboratory 2Centro Nacional de MetrologiaID Number007Baseline4151.458 km
Latitude 20° 32 min 13.284 s NCounter Delay 2.11 nsReference SourceSIMT(CNM)
Longitude100° 15 min 16.831 s WREF Delay 8.6 nsMask Angle10°
Altitude1928.65 mReceiver Delay140.3 nsReceiver Temp.32° C

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 1.90 563.66 -3.45 x 10-13 -0.06




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 1.80 x 10-11
0 h, 20 min 140 2.19 x 10-11
0 h, 40 min 136 2.24 x 10-11
1 h, 20 min 128 2.85 x 10-11
2 h, 40 min 112 2.38 x 10-11
5 h, 20 min 80 1.28 x 10-11


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 6.25
0 h, 20 min 139 13.37
0 h, 40 min 133 27.24
1 h, 20 min 121 72.08
2 h, 40 min 97 106.26
5 h, 20 min 49 126.29


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
1 280 180 214.24 5.65 -2.05 x 10-11 -0.88 View
2 490 310 191.52 6.23 -1.40 x 10-13 -0.10 View
3 380 120 172.43 2.55 -2.52 x 10-11 -0.99 View
4 280 140 336.22 13.12 +4.07 x 10-11 +0.87 View
5 460 230 276.68 9.48 +5.64 x 10-14 +0.03 View
6 440 270 179.42 5.44 -8.71 x 10-12 -0.78 View
7 280 260 427.64 10.32 +5.69 x 10-12 +0.24 View
8 280 200 455.98 10.88 +4.40 x 10-11 +0.91 View
9 450 200 471.40 11.59 +5.02 x 10-11 +0.95 View
10 310 260 294.22 2.33 -2.18 x 10-11 -0.95 View
11 --- --- ---------- ------- -------------- ------ ----
12 390 150 207.06 10.65 +3.30 x 10-13 +0.20 View
13 340 250 235.09 3.78 +1.14 x 10-12 +0.24 View
14 250 210 152.29 2.58 +7.59 x 10-13 +0.07 View
15 360 260 443.72 3.83 +2.48 x 10-11 +0.82 View
16 400 270 270.95 5.74 -1.74 x 10-11 -0.95 View
17 390 250 150.68 2.95 +3.01 x 10-12 +0.35 View
18 310 280 454.99 3.85 +1.27 x 10-11 +0.47 View
19 310 230 168.62 6.17 +4.55 x 10-13 +0.14 View
20 360 270 549.08 4.22 +3.48 x 10-11 +0.95 View
21 240 140 201.88 6.20 -1.24 x 10-11 -0.50 View
22 410 180 207.09 6.17 -1.84 x 10-11 -0.96 View
23 290 230 325.78 4.61 -1.82 x 10-11 -0.82 View
24 260 130 295.50 5.23 +4.21 x 10-11 +0.97 View
25 240 90 85.18 1.84 -1.57 x 10-11 -0.98 View
26 400 190 254.80 7.03 -1.27 x 10-11 -0.89 View
27 270 240 187.93 2.60 -1.13 x 10-11 -0.74 View
28 240 160 157.10 2.09 -1.74 x 10-11 -0.95 View
29 350 100 431.15 1.39 +4.80 x 10-11 +1.00 View
30 270 100 103.11 3.05 +8.68 x 10-12 +0.52 View
31 460 290 200.31 5.58 -8.00 x 10-12 -0.88 View
32 410 310 300.18 4.03 -1.34 x 10-11 -0.84 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.