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 Date2021-04-25
Latitude 16° 30 min 1.043 s SCounter Delay -0.05 nsReference SourceSIMT(IBM)
Longitude 68° 7 min 57.024 s WREF Delay 2.9 nsMask Angle10°
Altitude3649.11 mReceiver Delay103.0 nsReceiver Temp.42 °C
Laboratory 2Centro Nacional de MetrologiaID Number007Baseline5236.633 km
Latitude 20° 32 min 13.284 s NCounter Delay 2.09 nsReference SourceSIMT(CNM)
Longitude100° 15 min 16.831 s WREF Delay 8.6 nsMask Angle10°
Altitude1928.65 mReceiver Delay140.3 nsReceiver Temp.31° C

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 12231.39 100.55 +1.29 x 10-12 +1.00




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 6.64 x 10-12
0 h, 20 min 140 3.67 x 10-12
0 h, 40 min 136 2.23 x 10-12
1 h, 20 min 128 1.42 x 10-12
2 h, 40 min 112 5.11 x 10-13
5 h, 20 min 80 2.37 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 2.30
0 h, 20 min 139 1.83
0 h, 40 min 133 2.09
1 h, 20 min 121 2.47
2 h, 40 min 97 0.86
5 h, 20 min 49 0.84


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 7.71 1.83 +3.07 x 10-13 +0.41 View
2 280 100 116.60 1.81 +1.43 x 10-12 +0.99 View
3 310 110 16.10 5.69 +1.50 x 10-13 +0.07 View
4 290 140 25.36 1.62 +3.40 x 10-12 +0.98 View
5 290 150 118.23 4.37 +1.30 x 10-12 +0.99 View
6 260 160 16.37 4.13 -9.63 x 10-14 -0.06 View
7 350 180 31.42 1.94 +3.15 x 10-12 +0.97 View
8 310 220 14.22 2.28 -4.13 x 10-13 -0.50 View
9 330 130 16.90 1.82 +1.89 x 10-12 +0.79 View
10 320 170 38.55 1.52 +4.16 x 10-12 +0.99 View
11 --- --- ---------- ------- -------------- ------ ----
12 310 130 27.47 3.46 +2.49 x 10-12 +0.77 View
13 330 200 120.70 2.03 +1.24 x 10-12 +0.90 View
14 300 190 27.05 1.96 +2.44 x 10-12 +0.93 View
15 320 170 11.63 1.29 -6.58 x 10-13 -0.85 View
16 170 170 8.85 1.82 +2.57 x 10-13 +0.35 View
17 280 130 40.47 4.68 +1.42 x 10-12 +0.90 View
18 340 190 37.08 2.49 +3.22 x 10-12 +0.97 View
19 220 100 43.13 0.71 +1.75 x 10-12 +0.98 View
20 260 110 100.72 3.81 +1.40 x 10-12 +0.99 View
21 270 90 10.21 2.83 -2.25 x 10-13 -0.15 View
22 140 70 18.50 1.93 +5.13 x 10-12 +0.98 View
23 260 130 40.81 8.29 +3.40 x 10-12 +0.87 View
24 270 120 10.08 1.41 -3.99 x 10-13 -0.31 View
25 380 160 42.59 3.02 +1.38 x 10-12 +0.90 View
26 300 130 10.33 1.91 -4.06 x 10-13 -0.50 View
27 320 200 14.46 2.12 -4.96 x 10-13 -0.46 View
28 240 130 27.91 2.35 +3.69 x 10-12 +0.95 View
29 310 160 21.44 1.49 +2.02 x 10-12 +0.87 View
30 310 180 27.75 1.88 +2.40 x 10-12 +0.90 View
31 250 150 14.70 2.18 -4.11 x 10-13 -0.33 View
32 290 150 63.32 4.48 +1.37 x 10-12 +0.85 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.