SIMT(ICE) versus SIMT(IBM) 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 2IBMETRO Bolivia ID Number025Baseline3369.486 km
Latitude 16° 30 min 1.070 s SCounter Delay 0.01 nsReference SourceSIMT(IBM)
Longitude 68° 7 min 56.998 s WREF Delay 2.9 nsMask Angle10°
Altitude3648.75 mReceiver Delay103.0 nsReceiver Temp.41 °C

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 29.06 17.36 +1.29 x 10-13 +0.67




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 5.64 x 10-12
0 h, 20 min 140 3.27 x 10-12
0 h, 40 min 136 2.16 x 10-12
1 h, 20 min 128 1.40 x 10-12
2 h, 40 min 112 5.35 x 10-13
5 h, 20 min 80 2.58 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 1.95
0 h, 20 min 139 1.76
0 h, 40 min 133 2.12
1 h, 20 min 121 2.44
2 h, 40 min 97 1.82
5 h, 20 min 49 2.16


SIMT(ICE) - SIMT(IBM)
(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 20.74 1.93 +7.38 x 10-13 +0.49 View
2 520 170 17.21 3.74 -1.19 x 10-13 -0.27 View
3 400 170 11.68 2.56 +3.35 x 10-13 +0.30 View
4 320 210 15.57 1.28 -1.66 x 10-14 -0.01 View
5 400 190 13.88 3.42 -1.02 x 10-13 -0.10 View
6 380 170 23.64 2.17 +7.60 x 10-13 +0.46 View
7 300 220 17.61 1.66 -1.92 x 10-13 -0.13 View
8 240 240 21.60 1.71 -3.60 x 10-13 -0.31 View
9 290 170 34.42 1.48 +1.56 x 10-12 +0.65 View
10 410 200 22.61 3.51 -2.92 x 10-14 -0.19 View
11 --- --- ---------- ------- -------------- ------ ----
12 380 140 17.05 3.16 +5.95 x 10-13 +0.29 View
13 240 190 23.87 3.52 +8.14 x 10-13 +0.55 View
14 450 230 20.91 1.48 -8.10 x 10-13 -0.53 View
15 330 260 22.67 1.87 +1.34 x 10-12 +0.82 View
16 330 250 34.22 2.15 +2.47 x 10-13 +0.82 View
17 400 90 29.61 4.95 +6.32 x 10-13 +0.63 View
18 290 210 33.03 1.44 +1.32 x 10-12 +0.49 View
19 320 80 14.05 1.74 -1.15 x 10-12 -0.87 View
20 330 250 15.38 1.56 +7.91 x 10-13 +0.75 View
21 460 230 27.90 2.18 -3.77 x 10-13 -0.19 View
22 280 60 14.69 7.66 +6.57 x 10-13 +0.45 View
23 470 230 25.20 2.09 -2.41 x 10-13 -0.57 View
24 320 130 28.91 1.41 +1.17 x 10-12 +0.70 View
25 480 330 21.45 3.43 +1.44 x 10-13 +0.17 View
26 350 270 40.96 1.57 +1.41 x 10-13 +0.44 View
27 290 240 33.44 3.17 -4.73 x 10-13 -0.27 View
28 --- --- ---------- ------- -------------- ------ ----
29 270 200 19.69 2.01 +1.24 x 10-12 +0.70 View
30 280 200 26.12 3.97 -1.12 x 10-12 -0.70 View
31 350 130 19.04 2.14 -1.81 x 10-12 -0.88 View
32 440 150 43.07 5.89 +4.79 x 10-14 +0.17 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.