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

Laboratory 1IBMETRO Bolivia ID Number025End Date2021-04-23
Latitude 16° 30 min 1.043 s SCounter Delay -0.00 nsReference SourceSIMT(IBM)
Longitude 68° 7 min 57.024 s WREF Delay 2.9 nsMask Angle10°
Altitude3649.11 mReceiver Delay103.0 nsReceiver Temp.39 °C
Laboratory 2Centro Nacional de MetrologiaID Number007Baseline5236.633 km
Latitude 20° 32 min 13.284 s NCounter Delay 2.11 nsReference SourceSIMT(CNM)
Longitude100° 15 min 16.831 s WREF Delay 8.6 nsMask Angle10°
Altitude1928.65 mReceiver Delay140.3 nsReceiver Temp.32° C

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 12039.20 87.17 +1.04 x 10-12 +1.00




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 6.36 x 10-12
0 h, 20 min 140 3.40 x 10-12
0 h, 40 min 136 1.93 x 10-12
1 h, 20 min 128 1.28 x 10-12
2 h, 40 min 112 4.50 x 10-13
5 h, 20 min 80 2.16 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 2.20
0 h, 20 min 139 1.72
0 h, 40 min 133 1.74
1 h, 20 min 121 2.02
2 h, 40 min 97 1.11
5 h, 20 min 49 1.34


SIMT(IBM) - SIMT(CNM)
(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
1 340 140 5.33 1.37 -2.52 x 10-14 -0.04 View
2 260 80 84.61 2.68 +1.11 x 10-12 +0.99 View
3 320 120 13.25 4.36 +3.70 x 10-13 +0.22 View
4 300 140 21.68 1.22 +2.79 x 10-12 +0.98 View
5 290 160 99.16 1.51 +1.13 x 10-12 +1.00 View
6 270 170 24.95 6.69 -8.52 x 10-14 -0.05 View
7 350 190 28.95 2.52 +2.45 x 10-12 +0.91 View
8 320 230 19.56 2.21 -1.28 x 10-12 -0.92 View
9 320 120 19.93 2.73 +2.92 x 10-12 +0.95 View
10 330 180 41.08 1.59 +4.16 x 10-12 +0.99 View
11 --- --- ---------- ------- -------------- ------ ----
12 320 130 34.20 2.71 +4.65 x 10-12 +0.95 View
13 330 190 80.54 1.64 +8.84 x 10-13 +0.96 View
14 310 180 22.52 3.70 +1.80 x 10-12 +0.77 View
15 320 230 11.14 1.87 -2.07 x 10-13 -0.27 View
16 170 170 8.47 1.93 +8.97 x 10-14 +0.14 View
17 250 130 30.71 2.85 +1.04 x 10-12 +0.88 View
18 340 190 35.41 2.34 +3.05 x 10-12 +0.98 View
19 200 110 94.78 3.05 +1.10 x 10-12 +0.99 View
20 290 140 35.37 2.22 +1.10 x 10-12 +0.89 View
21 270 90 12.07 4.99 -7.19 x 10-13 -0.53 View
22 140 70 18.05 4.20 +4.58 x 10-12 +0.88 View
23 250 120 36.05 5.54 +2.88 x 10-12 +0.87 View
24 240 90 14.29 0.96 -2.47 x 10-12 -0.93 View
25 380 150 38.44 4.25 +7.90 x 10-13 +0.77 View
26 310 130 14.07 1.68 -1.91 x 10-13 -0.18 View
27 320 200 15.28 2.05 -6.74 x 10-13 -0.68 View
28 230 130 16.51 1.04 +2.04 x 10-12 +0.85 View
29 310 100 23.66 2.24 +2.75 x 10-12 +0.95 View
30 320 190 24.01 1.90 +1.60 x 10-12 +0.72 View
31 270 170 12.66 2.23 -5.88 x 10-13 -0.57 View
32 280 140 57.38 4.14 +9.98 x 10-13 +0.73 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.