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

Laboratory 1Instituto Costarricense de Electridad (ICE), Costa RicaID Number011End Date2021-09-13
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
Laboratory 2Instituto Nacional de Metrologia (INM)ID Number012Baseline1244.072 km
Latitude 4° 38 min 34.643 s NCounter Delay 0.30 nsReference SourceSIMT(INM)
Longitude 74° 5 min 32.593 s WREF Delay 60.9 nsMask Angle10°
Altitude2611.11 mReceiver Delay128.2 nsReceiver Temp.27 °C

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 96.65 5.26 +1.11 x 10-14 +0.16




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 4.96 x 10-12
0 h, 20 min 140 3.07 x 10-12
0 h, 40 min 136 1.91 x 10-12
1 h, 20 min 128 8.65 x 10-13
2 h, 40 min 112 4.46 x 10-13
5 h, 20 min 80 1.53 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 1.72
0 h, 20 min 139 1.68
0 h, 40 min 133 1.67
1 h, 20 min 121 1.27
2 h, 40 min 97 0.99
5 h, 20 min 49 1.07


SIMT(ICE) - SIMT(INM)
(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
1 320 220 31.44 1.85 -5.26 x 10-13 -0.33 View
2 520 500 19.87 2.33 +9.64 x 10-14 +0.16 View
3 400 400 31.17 1.18 +3.15 x 10-13 +0.43 View
4 320 220 28.97 1.14 +1.82 x 10-12 +0.81 View
5 400 350 21.02 1.69 +6.36 x 10-13 +0.65 View
6 380 360 24.04 2.52 +3.52 x 10-13 +0.33 View
7 300 270 34.01 1.61 +1.33 x 10-12 +0.62 View
8 240 230 35.99 1.34 -2.24 x 10-12 -0.89 View
9 290 270 24.83 1.29 +8.46 x 10-13 +0.55 View
10 410 330 46.23 3.02 -3.19 x 10-13 -0.90 View
11 --- --- ---------- ------- -------------- ------ ----
12 380 300 27.04 3.38 +4.81 x 10-13 +0.78 View
13 240 170 27.50 1.08 -1.43 x 10-12 -0.82 View
14 450 280 28.93 1.17 +1.54 x 10-12 +0.79 View
15 330 330 26.22 1.78 -8.39 x 10-13 -0.66 View
16 330 330 48.42 1.90 +3.70 x 10-13 +0.80 View
17 400 300 16.35 2.04 +4.40 x 10-14 +0.11 View
18 290 260 50.94 1.26 +2.01 x 10-12 +0.64 View
19 320 240 21.33 2.77 -2.48 x 10-14 -0.04 View
20 330 300 25.11 1.69 -3.63 x 10-13 -0.28 View
21 460 260 42.78 1.56 -2.04 x 10-12 -0.82 View
22 280 220 26.80 1.55 +4.96 x 10-13 +0.80 View
23 470 330 56.61 1.55 -4.04 x 10-13 -0.48 View
24 320 220 37.96 2.44 -1.67 x 10-12 -0.86 View
25 480 300 33.16 1.62 -9.17 x 10-13 -0.73 View
26 350 340 57.18 2.14 +2.58 x 10-13 +0.62 View
27 290 280 49.68 3.30 -1.77 x 10-12 -0.71 View
28 --- --- ---------- ------- -------------- ------ ----
29 270 230 31.57 1.97 +1.78 x 10-12 +0.84 View
30 280 190 24.72 4.37 +1.20 x 10-12 +0.66 View
31 350 350 26.47 1.79 -8.27 x 10-15 -0.05 View
32 440 370 24.13 3.57 +4.65 x 10-14 +0.25 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.