SIMT(LNM) 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 Metrologia de GuatemalaID Number015End Date2021-09-13
Latitude 14° 35 min 24.774 s NCounter Delay -0.14 nsReference SourceSIMT(LNM)
Longitude 90° 32 min 31.394 s WREF Delay 0 nsMask Angle10°
Altitude1509.00 mReceiver Delay168.3 nsReceiver Temp.27 °C
Laboratory 2IBMETRO Bolivia ID Number025Baseline4153.907 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)
24 109.94 25.87 -6.91 x 10-14 -0.25




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 6.58 x 10-12
0 h, 20 min 140 4.48 x 10-12
0 h, 40 min 136 2.63 x 10-12
1 h, 20 min 128 2.01 x 10-12
2 h, 40 min 112 1.09 x 10-12
5 h, 20 min 80 6.15 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 2.28
0 h, 20 min 139 2.41
0 h, 40 min 133 2.73
1 h, 20 min 121 4.14
2 h, 40 min 97 4.70
5 h, 20 min 49 5.92


SIMT(LNM) - 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
1 350 240 25.28 2.54 +1.46 x 10-12 +0.84 View
2 360 130 35.36 3.40 -1.38 x 10-12 -0.93 View
3 210 90 12.98 2.05 -7.63 x 10-13 -0.45 View
4 270 180 16.95 1.50 -1.43 x 10-12 -0.93 View
5 310 140 12.45 2.80 +4.95 x 10-15 0.00 View
6 320 150 29.16 3.31 +1.92 x 10-12 +0.76 View
7 260 210 26.80 1.46 -2.15 x 10-12 -0.90 View
8 270 220 22.24 2.22 +1.61 x 10-12 +0.89 View
9 240 130 27.59 1.80 +3.32 x 10-13 +0.12 View
10 410 180 18.84 1.34 +1.13 x 10-13 +0.71 View
11 --- --- ---------- ------- -------------- ------ ----
12 190 100 35.72 5.20 -3.58 x 10-12 -0.77 View
13 260 150 20.15 4.00 +5.67 x 10-13 +0.30 View
14 440 210 33.05 1.53 -2.74 x 10-12 -0.97 View
15 310 240 34.00 1.70 +4.64 x 10-13 +0.23 View
16 320 220 23.97 1.83 +4.10 x 10-14 +0.14 View
17 360 70 12.83 5.08 -4.51 x 10-13 -0.68 View
18 300 210 17.71 1.86 -6.35 x 10-13 -0.52 View
19 190 50 9.92 3.98 -2.88 x 10-12 -0.64 View
20 220 200 16.67 1.58 +1.09 x 10-12 +0.69 View
21 240 80 28.82 2.11 +3.17 x 10-12 +0.96 View
22 250 50 12.54 6.35 -3.50 x 10-12 -0.59 View
23 400 180 26.94 1.82 -1.67 x 10-12 -0.78 View
24 320 150 28.05 1.20 +2.41 x 10-12 +0.86 View
25 270 120 23.66 6.71 +3.08 x 10-13 +0.41 View
26 290 210 20.38 1.81 -3.64 x 10-14 -0.26 View
27 290 210 20.85 2.42 +8.81 x 10-13 +0.55 View
28 --- --- ---------- ------- -------------- ------ ----
29 260 150 15.87 1.82 -2.42 x 10-13 -0.13 View
30 280 210 27.97 1.48 -2.29 x 10-12 -0.96 View
31 310 90 13.72 2.36 +9.23 x 10-14 +0.05 View
32 350 110 34.33 3.15 +2.37 x 10-13 +0.83 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.