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

Laboratory 1Centro Nacional de MetrologiaID Number007End Date2021-09-13
Latitude 20° 32 min 13.284 s NCounter Delay 2.08 nsReference SourceSIMT(CNM)
Longitude100° 15 min 16.831 s WREF Delay 8.6 nsMask Angle10°
Altitude1928.65 mReceiver Delay140.3 nsReceiver Temp.32° C
Laboratory 2IBMETRO Bolivia ID Number025Baseline5236.634 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 80.74 22.52 +1.65 x 10-13 +0.66




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 7.25 x 10-12
0 h, 20 min 140 4.62 x 10-12
0 h, 40 min 136 2.69 x 10-12
1 h, 20 min 128 1.77 x 10-12
2 h, 40 min 112 7.99 x 10-13
5 h, 20 min 80 3.65 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 2.51
0 h, 20 min 139 2.45
0 h, 40 min 133 2.59
1 h, 20 min 121 3.37
2 h, 40 min 97 2.68
5 h, 20 min 49 1.71


SIMT(CNM) - 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
1 400 170 31.00 2.68 +2.65 x 10-12 +0.89 View
2 400 110 24.67 3.19 -5.72 x 10-13 -0.81 View
3 300 110 20.19 2.64 -1.57 x 10-12 -0.51 View
4 240 170 21.13 1.72 -2.13 x 10-12 -0.93 View
5 310 150 19.32 2.62 +1.79 x 10-12 +0.84 View
6 350 170 36.82 3.03 +2.50 x 10-12 +0.86 View
7 390 190 22.95 1.34 -2.27 x 10-12 -0.95 View
8 290 230 24.65 2.31 +1.62 x 10-12 +0.88 View
9 300 150 27.46 2.13 -2.55 x 10-13 -0.10 View
10 450 150 29.43 1.98 +1.63 x 10-13 +0.62 View
11 --- --- ---------- ------- -------------- ------ ----
12 290 110 22.38 4.07 -2.01 x 10-12 -0.65 View
13 420 180 29.59 2.86 +2.00 x 10-12 +0.89 View
14 400 180 33.62 1.68 -3.33 x 10-12 -0.96 View
15 320 250 22.39 1.54 +1.53 x 10-12 +0.83 View
16 310 220 18.10 1.65 +6.66 x 10-14 +0.30 View
17 410 80 35.89 4.15 +3.17 x 10-13 +0.26 View
18 360 190 21.19 0.84 -1.66 x 10-12 -0.79 View
19 380 110 27.87 2.32 +2.79 x 10-13 +0.19 View
20 290 220 27.06 1.81 +2.01 x 10-12 +0.89 View
21 300 80 26.59 1.42 +3.11 x 10-12 +0.99 View
22 290 50 15.26 7.01 -4.62 x 10-12 -0.72 View
23 460 170 34.01 2.40 -2.72 x 10-12 -0.89 View
24 420 150 21.99 2.40 +1.09 x 10-12 +0.42 View
25 280 90 14.99 5.30 -1.37 x 10-12 -0.53 View
26 220 150 21.87 2.08 +3.49 x 10-14 +0.26 View
27 380 180 26.43 1.82 +2.01 x 10-12 +0.77 View
28 --- --- ---------- ------- -------------- ------ ----
29 260 150 12.88 0.97 -8.31 x 10-13 -0.63 View
30 300 190 38.32 2.22 -3.09 x 10-12 -0.95 View
31 360 150 18.73 2.39 -1.18 x 10-12 -0.66 View
32 450 140 47.10 6.26 +1.94 x 10-13 +0.51 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.