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

Laboratory 1Centro Nacional de Metrologia de GuatemalaID Number015End Date2021-04-25
Latitude 14° 35 min 24.774 s NCounter Delay -0.09 nsReference SourceSIMT(LNM)
Longitude 90° 32 min 31.394 s WREF Delay 0 nsMask Angle10°
Altitude1509.00 mReceiver Delay168.3 nsReceiver Temp.26 °C
Laboratory 2Centro Nacional de MetrologiaID Number007Baseline1221.121 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 33.49 20.57 -1.33 x 10-13 -0.47




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 3.88 x 10-12
0 h, 20 min 140 2.51 x 10-12
0 h, 40 min 136 1.59 x 10-12
1 h, 20 min 128 8.46 x 10-13
2 h, 40 min 112 5.77 x 10-13
5 h, 20 min 80 4.72 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 1.35
0 h, 20 min 139 1.37
0 h, 40 min 133 1.46
1 h, 20 min 121 1.48
2 h, 40 min 97 2.68
5 h, 20 min 49 6.09


SIMT(LNM) - 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
1 340 250 19.29 2.23 -4.42 x 10-13 -0.93 View
2 360 330 16.55 1.95 -7.97 x 10-14 -0.61 View
3 190 160 17.87 1.81 -1.38 x 10-12 -0.85 View
4 270 150 16.59 1.90 -9.49 x 10-13 -0.81 View
5 340 280 15.79 1.62 -3.54 x 10-14 -0.36 View
6 330 320 19.40 2.00 +6.23 x 10-15 +0.01 View
7 300 270 16.20 1.43 +6.24 x 10-13 +0.82 View
8 270 260 25.28 1.32 -1.47 x 10-12 -0.88 View
9 220 220 13.66 1.16 -6.27 x 10-13 -0.60 View
10 410 370 19.42 2.21 +6.78 x 10-13 +0.82 View
11 --- --- ---------- ------- -------------- ------ ----
12 190 190 21.75 1.79 -1.12 x 10-13 -0.77 View
13 340 290 24.84 1.81 -4.84 x 10-14 -0.25 View
14 400 360 18.51 1.64 -4.62 x 10-14 -0.10 View
15 310 230 29.23 3.04 +7.12 x 10-13 +0.71 View
16 270 260 22.87 3.03 -8.95 x 10-13 -0.82 View
17 340 340 13.60 1.84 +6.69 x 10-14 +0.15 View
18 310 280 12.89 1.57 +6.60 x 10-13 +0.85 View
19 360 330 13.80 1.41 +1.51 x 10-13 +0.26 View
20 360 310 22.83 2.93 +8.28 x 10-13 +0.79 View
21 310 270 18.91 2.74 -4.36 x 10-13 -0.89 View
22 250 240 11.50 1.88 -4.36 x 10-13 -0.71 View
23 260 240 22.59 2.36 +8.10 x 10-13 +0.88 View
24 320 280 25.64 1.84 -2.57 x 10-13 -0.91 View
25 220 150 25.66 2.38 +1.66 x 10-13 +0.36 View
26 300 180 10.82 2.07 -2.64 x 10-13 -0.51 View
27 310 270 23.29 2.52 -2.25 x 10-13 -0.45 View
28 260 160 9.34 1.96 +1.28 x 10-14 +0.03 View
29 240 220 9.98 1.16 +6.96 x 10-13 +0.76 View
30 280 220 13.34 2.47 +5.32 x 10-13 +0.62 View
31 330 320 18.52 2.37 +5.64 x 10-13 +0.80 View
32 360 330 20.59 1.90 +7.62 x 10-13 +0.90 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.