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 Date2021-09-14
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.33° C
Laboratory 2Instituto Costarricense de Electridad (ICE), Costa RicaID Number011Baseline2087.183 km
Latitude 9° 55 min 52.809 s NCounter Delay 0.29 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 53.58 25.01 -7.74 x 10-14 -0.31




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 3.86 x 10-12
0 h, 20 min 140 2.34 x 10-12
0 h, 40 min 136 1.65 x 10-12
1 h, 20 min 128 1.35 x 10-12
2 h, 40 min 112 7.15 x 10-13
5 h, 20 min 80 4.30 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 1.34
0 h, 20 min 139 1.26
0 h, 40 min 133 1.77
1 h, 20 min 121 2.86
2 h, 40 min 97 2.99
5 h, 20 min 49 4.06


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
1 380 260 26.63 2.01 -1.54 x 10-13 -0.44 View
2 420 420 23.87 2.34 +2.96 x 10-13 +0.42 View
3 300 230 20.12 2.29 -9.90 x 10-13 -0.73 View
4 240 200 21.92 1.57 -4.60 x 10-13 -0.38 View
5 310 310 29.26 2.08 -4.87 x 10-14 -0.03 View
6 350 340 23.26 2.49 -1.50 x 10-13 -0.16 View
7 390 260 35.69 2.56 -6.79 x 10-13 -0.48 View
8 280 220 18.38 2.04 +1.11 x 10-12 +0.83 View
9 310 280 18.81 1.69 -3.19 x 10-13 -0.32 View
10 460 370 24.85 2.47 -5.63 x 10-14 -0.19 View
11 --- --- ---------- ------- -------------- ------ ----
12 300 210 14.47 1.39 -2.20 x 10-13 -0.22 View
13 400 210 21.50 1.58 -6.65 x 10-13 -0.50 View
14 390 330 24.31 1.66 -3.08 x 10-13 -0.40 View
15 310 310 33.34 3.52 -6.74 x 10-13 -0.55 View
16 320 310 22.76 1.79 -1.52 x 10-13 -0.56 View
17 410 330 22.81 1.79 -3.73 x 10-13 -0.47 View
18 360 260 26.97 2.45 -1.40 x 10-12 -0.79 View
19 390 250 27.83 3.38 -6.60 x 10-13 -0.54 View
20 300 300 22.21 1.51 +1.08 x 10-12 +0.90 View
21 290 240 28.38 2.83 -2.67 x 10-13 -0.90 View
22 300 210 17.86 1.00 -9.50 x 10-13 -0.81 View
23 450 400 36.83 2.65 -1.13 x 10-12 -0.90 View
24 430 240 28.91 2.27 -1.42 x 10-13 -0.26 View
25 290 180 40.35 2.72 -9.71 x 10-13 -0.92 View
26 220 220 27.72 5.19 -8.99 x 10-14 -0.42 View
27 400 220 18.61 2.16 +9.03 x 10-13 +0.80 View
28 --- --- ---------- ------- -------------- ------ ----
29 270 210 14.09 2.19 -6.35 x 10-13 -0.56 View
30 290 210 20.79 1.63 -4.80 x 10-13 -0.39 View
31 350 290 31.40 2.40 -9.03 x 10-14 -0.33 View
32 430 410 25.27 4.96 -2.35 x 10-14 -0.10 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.