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

Laboratory 1Centro Nacional de MetrologiaID Number007End Date2021-09-12
Latitude 20° 32 min 13.284 s NCounter Delay 2.18 nsReference SourceSIMT(CNM)
Longitude100° 15 min 16.831 s WREF Delay 8.6 nsMask Angle10°
Altitude1928.65 mReceiver Delay140.3 nsReceiver Temp.32° C
Laboratory 2Instituto Costarricense de Electridad (ICE), Costa RicaID Number011Baseline2087.183 km
Latitude 9° 55 min 52.809 s NCounter Delay 0.28 nsReference SourceSIMT(ICE)
Longitude 84° 3 min 22.568 s WREF Delay 30.7 nsMask Angle10°
Altitude1247.76 mReceiver Delay238.2 nsReceiver Temp.26 °C

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 46.78 11.71 -1.01 x 10-14 -0.09




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 4.11 x 10-12
0 h, 20 min 140 2.18 x 10-12
0 h, 40 min 136 1.38 x 10-12
1 h, 20 min 128 1.05 x 10-12
2 h, 40 min 112 4.68 x 10-13
5 h, 20 min 80 1.95 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 1.42
0 h, 20 min 139 1.12
0 h, 40 min 133 1.34
1 h, 20 min 121 2.08
2 h, 40 min 97 1.46
5 h, 20 min 49 1.33


SIMT(CNM) - SIMT(ICE)
(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
1 410 260 13.74 2.11 -1.42 x 10-14 -0.05 View
2 400 400 29.71 2.64 -3.87 x 10-13 -0.44 View
3 310 240 15.92 1.47 -1.02 x 10-12 -0.89 View
4 230 200 28.93 1.48 -5.95 x 10-13 -0.44 View
5 310 310 22.82 1.61 -6.90 x 10-13 -0.55 View
6 340 330 22.04 2.54 -3.21 x 10-13 -0.30 View
7 380 270 21.96 2.43 -2.45 x 10-13 -0.27 View
8 280 210 26.06 1.23 +2.11 x 10-12 +0.88 View
9 300 270 16.83 1.29 -2.19 x 10-13 -0.23 View
10 470 370 26.69 2.64 +1.62 x 10-13 +0.78 View
11 --- --- ---------- ------- -------------- ------ ----
12 300 210 14.88 1.49 -8.64 x 10-13 -0.79 View
13 410 170 9.62 1.97 -2.07 x 10-13 -0.29 View
14 400 330 17.68 1.83 -3.13 x 10-13 -0.48 View
15 310 300 36.70 2.19 -5.01 x 10-13 -0.37 View
16 320 310 19.49 2.38 +4.71 x 10-14 +0.21 View
17 410 330 23.39 2.68 -3.25 x 10-13 -0.46 View
18 350 260 19.76 1.92 -7.94 x 10-13 -0.74 View
19 370 240 24.62 3.91 -4.92 x 10-13 -0.47 View
20 300 300 17.28 2.18 +3.84 x 10-13 +0.40 View
21 310 250 21.58 2.00 -9.40 x 10-14 -0.64 View
22 300 210 20.28 1.17 -1.44 x 10-12 -0.92 View
23 450 400 26.34 2.39 -5.64 x 10-13 -0.71 View
24 390 240 16.25 2.05 -2.22 x 10-14 -0.07 View
25 260 160 26.18 2.11 -4.36 x 10-13 -0.80 View
26 210 210 33.24 2.73 +6.16 x 10-14 +0.27 View
27 390 230 22.98 1.88 +1.50 x 10-12 +0.91 View
28 --- --- ---------- ------- -------------- ------ ----
29 270 220 15.07 0.99 -2.42 x 10-13 -0.22 View
30 310 220 24.30 2.35 -5.94 x 10-13 -0.41 View
31 350 290 41.59 1.41 +5.60 x 10-14 +0.25 View
32 450 430 35.21 5.92 +1.21 x 10-13 +0.58 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.