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

Laboratory 1Centro de Investigaciones de MetrologiaID Number028End Date2021-09-13
Latitude 13° 43 min 13.213 s NCounter Delay -0.14 nsReference SourceSIMT(CIM)
Longitude 89° 12 min 0.835 s WREF Delay 2.5 nsMask Angle10°
Altitude692.56 mReceiver Delay83.2 nsReceiver Temp.27 °C
Laboratory 2IBMETRO Bolivia ID Number025Baseline3999.256 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 60.28 726.96 -3.28 x 10-12 -0.51




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 2.48 x 10-11
0 h, 20 min 140 2.19 x 10-11
0 h, 40 min 136 2.06 x 10-11
1 h, 20 min 128 2.54 x 10-11
2 h, 40 min 112 2.28 x 10-11
5 h, 20 min 80 1.05 x 10-11


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 8.59
0 h, 20 min 139 12.60
0 h, 40 min 133 25.42
1 h, 20 min 121 64.41
2 h, 40 min 97 107.75
5 h, 20 min 49 63.02


SIMT(CIM) - 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
1 330 240 475.38 2.63 -3.54 x 10-11 -0.99 View
2 460 150 520.92 9.42 -1.89 x 10-11 -0.98 View
3 230 150 458.20 5.73 +5.91 x 10-11 +0.94 View
4 280 200 194.27 4.87 -1.02 x 10-11 -0.56 View
5 370 200 161.21 6.08 -1.16 x 10-11 -0.91 View
6 360 160 71.68 3.92 -2.67 x 10-12 -0.44 View
7 300 220 122.98 2.25 +5.08 x 10-12 +0.54 View
8 290 240 347.88 6.40 +1.94 x 10-11 +0.69 View
9 250 160 148.79 1.81 -1.63 x 10-11 -0.98 View
10 290 180 73.22 2.36 -5.62 x 10-13 -0.87 View
11 --- --- ---------- ------- -------------- ------ ----
12 200 120 298.83 6.66 -4.04 x 10-11 -0.90 View
13 240 190 504.83 7.53 -4.55 x 10-11 -0.95 View
14 330 220 48.01 2.22 -2.45 x 10-12 -0.62 View
15 320 250 508.43 7.27 -4.02 x 10-11 -0.93 View
16 330 230 107.67 6.65 +3.35 x 10-13 +0.24 View
17 430 70 313.70 5.32 -1.13 x 10-11 -0.94 View
18 280 220 344.71 3.75 +2.60 x 10-11 +0.99 View
19 280 90 212.68 2.66 -6.68 x 10-12 -0.69 View
20 280 260 252.36 4.24 -1.46 x 10-11 -0.95 View
21 310 160 361.21 2.19 -3.97 x 10-11 -0.99 View
22 240 50 23.45 5.88 +9.77 x 10-12 +0.92 View
23 400 190 133.21 4.63 +1.40 x 10-11 +0.90 View
24 290 140 208.84 3.27 +2.28 x 10-11 +0.96 View
25 340 220 334.76 6.70 +1.14 x 10-11 +0.85 View
26 290 210 179.03 1.31 +8.18 x 10-13 +0.66 View
27 230 190 355.79 4.68 +2.66 x 10-11 +0.80 View
28 --- --- ---------- ------- -------------- ------ ----
29 320 180 398.07 3.10 +4.34 x 10-11 +1.00 View
30 250 210 142.53 4.27 +1.12 x 10-11 +0.87 View
31 360 150 100.80 5.52 -3.32 x 10-12 -0.42 View
32 410 140 170.78 6.64 -1.26 x 10-12 -0.84 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.