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 Date2021-09-13
Latitude 20° 32 min 13.284 s NCounter Delay 2.08 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.25 °C

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 53.37 16.94 +5.03 x 10-14 +0.29




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 3.79 x 10-12
0 h, 20 min 140 2.00 x 10-12
0 h, 40 min 136 1.31 x 10-12
1 h, 20 min 128 9.87 x 10-13
2 h, 40 min 112 4.99 x 10-13
5 h, 20 min 80 2.06 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 1.31
0 h, 20 min 139 1.06
0 h, 40 min 133 1.22
1 h, 20 min 121 2.00
2 h, 40 min 97 1.61
5 h, 20 min 49 2.54


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
1 400 270 16.45 2.13 +3.02 x 10-13 +0.75 View
2 400 400 23.24 2.13 -4.52 x 10-13 -0.54 View
3 300 220 19.01 1.53 -1.39 x 10-12 -0.92 View
4 240 200 20.22 1.32 -4.01 x 10-13 -0.39 View
5 310 310 23.42 1.89 -6.38 x 10-13 -0.52 View
6 350 340 24.23 2.88 -5.22 x 10-14 -0.05 View
7 390 260 22.42 1.52 -2.29 x 10-13 -0.27 View
8 290 220 25.58 2.15 +1.61 x 10-12 +0.88 View
9 300 270 22.57 1.78 -5.04 x 10-13 -0.47 View
10 450 360 35.71 3.05 +1.85 x 10-13 +0.61 View
11 --- --- ---------- ------- -------------- ------ ----
12 290 200 15.83 1.06 -1.37 x 10-12 -0.94 View
13 420 180 14.97 1.68 -7.29 x 10-13 -0.72 View
14 400 340 16.07 1.42 +3.64 x 10-14 +0.05 View
15 320 320 22.26 2.63 -5.95 x 10-13 -0.59 View
16 310 300 13.63 1.80 -6.27 x 10-14 -0.35 View
17 410 330 20.40 2.79 -4.45 x 10-14 -0.07 View
18 360 250 14.88 2.03 -4.82 x 10-13 -0.62 View
19 380 240 23.07 2.70 -4.08 x 10-13 -0.40 View
20 290 290 18.38 2.06 +9.79 x 10-14 +0.09 View
21 300 240 21.42 2.23 -3.11 x 10-14 -0.20 View
22 290 210 23.27 2.25 -1.40 x 10-12 -0.91 View
23 460 410 22.84 2.29 -4.07 x 10-13 -0.54 View
24 420 240 18.49 2.36 -1.47 x 10-13 -0.48 View
25 280 190 30.02 4.05 -7.03 x 10-13 -0.92 View
26 220 220 20.86 2.88 -1.07 x 10-14 -0.06 View
27 380 220 24.41 2.42 +1.14 x 10-12 +0.76 View
28 --- --- ---------- ------- -------------- ------ ----
29 260 200 10.04 1.66 -6.28 x 10-13 -0.77 View
30 300 220 23.65 2.52 -4.62 x 10-14 -0.03 View
31 360 300 40.45 2.60 +9.45 x 10-14 +0.41 View
32 450 420 31.94 3.13 +1.68 x 10-13 +0.68 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.