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

Laboratory 1Observatorio NacionalID Number010End Date2021-09-13
Latitude 22° 53 min 44.563 s SCounter Delay 0.07 nsReference SourceSIMT(ONRJ)
Longitude 43° 13 min 27.407 s WREF Delay 54.2 nsMask Angle10°
Altitude35.82 mReceiver Delay146.7 nsReceiver Temp.28 °C
Laboratory 2IBMETRO Bolivia ID Number025Baseline2682.287 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 89.64 13.66 +5.81 x 10-14 +0.37




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 4.82 x 10-12
0 h, 20 min 140 2.53 x 10-12
0 h, 40 min 136 1.63 x 10-12
1 h, 20 min 128 1.01 x 10-12
2 h, 40 min 112 4.92 x 10-13
5 h, 20 min 80 2.60 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 1.67
0 h, 20 min 139 1.33
0 h, 40 min 133 1.59
1 h, 20 min 121 1.74
2 h, 40 min 97 1.91
5 h, 20 min 49 2.95


SIMT(ONRJ) - 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
1 310 310 24.36 1.94 +6.62 x 10-13 +0.61 View
2 280 160 14.90 1.85 -1.49 x 10-14 -0.02 View
3 360 210 17.40 1.36 +1.44 x 10-12 +0.95 View
4 440 260 35.25 3.19 +1.44 x 10-12 +0.77 View
5 400 180 36.53 3.97 +4.59 x 10-13 +0.70 View
6 370 140 18.92 2.19 +3.73 x 10-13 +0.88 View
7 440 310 27.00 1.98 +1.27 x 10-12 +0.85 View
8 410 260 20.40 2.51 +4.47 x 10-13 +0.42 View
9 430 290 21.32 2.45 +9.91 x 10-13 +0.78 View
10 380 290 17.36 1.40 +2.62 x 10-14 +0.21 View
11 --- --- ---------- ------- -------------- ------ ----
12 340 230 10.38 2.07 +2.22 x 10-13 +0.37 View
13 310 310 24.26 2.86 +3.22 x 10-13 +0.33 View
14 410 300 25.10 2.71 +4.96 x 10-13 +0.36 View
15 440 250 25.57 1.84 +5.96 x 10-13 +0.41 View
16 370 210 18.10 2.12 +5.92 x 10-14 +0.43 View
17 320 140 12.74 3.87 -3.44 x 10-13 -0.46 View
18 470 340 35.91 4.39 -1.23 x 10-13 -0.35 View
19 330 190 28.09 3.57 -4.18 x 10-15 0.00 View
20 430 190 24.46 2.01 +1.12 x 10-13 +0.13 View
21 260 260 20.86 1.88 +3.77 x 10-13 +0.38 View
22 380 90 17.49 2.83 +1.49 x 10-12 +0.91 View
23 360 270 15.30 1.49 +5.27 x 10-15 +0.06 View
24 260 200 11.27 1.28 -1.12 x 10-13 -0.17 View
25 350 320 22.97 2.93 +4.29 x 10-13 +0.45 View
26 440 260 24.05 2.00 -7.51 x 10-16 -0.01 View
27 220 210 10.89 1.25 +1.91 x 10-13 +0.30 View
28 --- --- ---------- ------- -------------- ------ ----
29 400 260 37.09 3.23 +5.14 x 10-13 +0.31 View
30 260 100 5.93 1.06 +1.88 x 10-14 +0.03 View
31 360 130 16.98 2.07 -1.67 x 10-13 -0.75 View
32 340 250 26.15 2.81 +4.55 x 10-14 +0.17 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.