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

Laboratory 1Centro Nacional de MetrologiaID Number007End Date2021-04-24
Latitude 20° 32 min 13.284 s NCounter Delay 2.15 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 2Centro Nacional de Metrologia de GuatemalaID Number015Baseline1221.121 km
Latitude 14° 35 min 24.774 s NCounter Delay -0.16 nsReference SourceSIMT(LNM)
Longitude 90° 32 min 31.394 s WREF Delay 0 nsMask Angle10°
Altitude1509.00 mReceiver Delay168.3 nsReceiver Temp.26 °C

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 -28.78 22.48 +7.22 x 10-14 +0.26




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 3.92 x 10-12
0 h, 20 min 140 2.55 x 10-12
0 h, 40 min 136 1.45 x 10-12
1 h, 20 min 128 8.50 x 10-13
2 h, 40 min 112 5.42 x 10-13
5 h, 20 min 80 5.03 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 1.36
0 h, 20 min 139 1.31
0 h, 40 min 133 1.40
1 h, 20 min 121 1.40
2 h, 40 min 97 2.57
5 h, 20 min 49 6.12


SIMT(CNM) - SIMT(LNM)
(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
1 340 240 22.68 1.91 +4.92 x 10-13 +0.93 View
2 380 310 18.30 2.21 +2.00 x 10-14 +0.17 View
3 300 150 11.37 1.43 +9.59 x 10-13 +0.87 View
4 200 150 14.41 1.34 +6.64 x 10-13 +0.74 View
5 280 280 22.13 2.18 -3.64 x 10-14 -0.27 View
6 330 330 14.13 2.17 -2.48 x 10-13 -0.40 View
7 410 300 8.67 0.91 -2.83 x 10-15 -0.01 View
8 270 260 24.57 1.53 +1.37 x 10-12 +0.90 View
9 290 210 18.18 1.48 +9.26 x 10-13 +0.77 View
10 420 390 26.01 1.92 -7.39 x 10-13 -0.91 View
11 --- --- ---------- ------- -------------- ------ ----
12 260 160 15.52 1.31 -2.96 x 10-14 -0.29 View
13 430 290 23.36 1.96 -5.39 x 10-14 -0.30 View
14 420 370 16.42 1.65 -3.74 x 10-13 -0.52 View
15 310 210 31.41 3.07 -1.03 x 10-12 -0.83 View
16 300 270 20.45 1.60 +8.36 x 10-13 +0.83 View
17 390 330 15.74 1.45 -4.19 x 10-13 -0.67 View
18 370 280 16.79 1.46 -7.39 x 10-13 -0.87 View
19 430 340 13.81 1.73 -4.60 x 10-13 -0.77 View
20 430 330 22.37 2.80 -8.91 x 10-13 -0.88 View
21 360 300 23.06 2.08 +4.13 x 10-13 +0.82 View
22 280 230 12.59 1.88 +1.23 x 10-14 +0.02 View
23 460 260 29.64 3.75 -7.02 x 10-13 -0.82 View
24 370 260 19.54 1.97 +2.10 x 10-13 +0.91 View
25 360 210 30.90 2.41 -2.88 x 10-13 -0.57 View
26 200 180 9.75 2.48 +1.70 x 10-13 +0.38 View
27 390 270 27.77 2.33 +2.87 x 10-13 +0.42 View
28 250 160 10.52 1.54 -3.92 x 10-13 -0.86 View
29 290 220 15.90 1.25 -1.12 x 10-12 -0.88 View
30 310 210 14.19 2.56 -6.10 x 10-13 -0.58 View
31 350 320 18.85 2.44 -5.81 x 10-13 -0.76 View
32 420 350 19.35 1.59 -6.68 x 10-13 -0.86 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.