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

Laboratory 1Instituto Nacional de Metrologia (INM)ID Number012End Date2021-09-13
Latitude 4° 38 min 34.643 s NCounter Delay 0.30 nsReference SourceSIMT(INM)
Longitude 74° 5 min 32.593 s WREF Delay 60.9 nsMask Angle10°
Altitude2611.11 mReceiver Delay128.2 nsReceiver Temp.27 °C
Laboratory 2IBMETRO Bolivia ID Number025Baseline2415.065 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 -69.94 19.21 +1.22 x 10-13 +0.62




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 5.74 x 10-12
0 h, 20 min 140 3.59 x 10-12
0 h, 40 min 136 2.32 x 10-12
1 h, 20 min 128 1.33 x 10-12
2 h, 40 min 112 8.01 x 10-13
5 h, 20 min 80 2.48 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 1.99
0 h, 20 min 139 1.97
0 h, 40 min 133 2.25
1 h, 20 min 121 2.48
2 h, 40 min 97 2.27
5 h, 20 min 49 2.26


SIMT(INM) - 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
1 250 210 32.14 2.10 +1.95 x 10-12 +0.90 View
2 520 190 24.86 3.24 -1.72 x 10-13 -0.29 View
3 570 310 31.34 2.23 -8.53 x 10-13 -0.64 View
4 220 190 27.88 1.15 -2.58 x 10-12 -0.99 View
5 440 140 16.69 2.23 +1.59 x 10-12 +0.84 View
6 420 160 36.76 2.43 +2.99 x 10-12 +0.90 View
7 310 230 35.21 0.75 -2.73 x 10-12 -0.99 View
8 230 230 26.58 1.85 +1.80 x 10-12 +0.93 View
9 440 230 26.48 2.23 -5.12 x 10-13 -0.46 View
10 360 230 43.51 1.35 +3.02 x 10-13 +0.86 View
11 --- --- ---------- ------- -------------- ------ ----
12 490 220 28.03 2.89 -1.52 x 10-13 -0.11 View
13 200 200 34.49 2.87 +2.21 x 10-12 +0.94 View
14 300 250 40.56 1.39 -2.87 x 10-12 -0.97 View
15 350 270 39.06 1.50 +2.84 x 10-12 +0.97 View
16 360 250 25.83 1.53 -1.23 x 10-13 -0.48 View
17 370 100 34.90 6.58 +4.92 x 10-15 0.00 View
18 330 260 40.43 1.32 -2.44 x 10-12 -0.97 View
19 310 50 16.29 0.00 -2.32 x 10-12 -0.97 View
20 340 250 32.82 1.46 +2.31 x 10-12 +0.95 View
21 290 260 29.37 1.19 +2.05 x 10-12 +0.94 View
22 440 100 29.94 4.68 -1.03 x 10-12 -0.87 View
23 360 250 59.69 1.97 +3.43 x 10-13 +0.56 View
24 320 220 47.65 1.44 +3.63 x 10-12 +0.98 View
25 410 280 43.20 3.82 +1.31 x 10-12 +0.81 View
26 350 280 31.74 1.65 -1.53 x 10-13 -0.79 View
27 320 280 42.27 1.30 +2.24 x 10-12 +0.97 View
28 --- --- ---------- ------- -------------- ------ ----
29 290 180 20.38 1.03 -1.73 x 10-12 -0.93 View
30 290 180 33.84 1.04 -2.98 x 10-12 -0.99 View
31 480 150 17.86 1.45 +1.36 x 10-12 +0.74 View
32 470 230 39.72 3.59 +8.02 x 10-14 +0.24 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.