SIMT(INM) versus SIMT(ONRJ) 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 Date2021-09-12
Latitude 4° 38 min 34.643 s NCounter Delay 0.29 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 2Observatorio NacionalID Number010Baseline4438.348 km
Latitude 22° 53 min 44.563 s SCounter Delay 0.17 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

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 -163.07 29.57 +1.09 x 10-13 +0.35




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 4.61 x 10-12
0 h, 20 min 140 3.17 x 10-12
0 h, 40 min 136 2.15 x 10-12
1 h, 20 min 128 1.92 x 10-12
2 h, 40 min 112 9.73 x 10-13
5 h, 20 min 80 4.52 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 1.60
0 h, 20 min 139 1.71
0 h, 40 min 133 2.30
1 h, 20 min 121 4.15
2 h, 40 min 97 2.78
5 h, 20 min 49 5.30


SIMT(INM) - SIMT(ONRJ)
(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
1 240 200 21.89 1.08 +1.50 x 10-12 +0.87 View
2 530 150 14.36 1.35 -1.41 x 10-12 -0.89 View
3 570 360 15.27 1.11 -4.54 x 10-14 -0.07 View
4 220 150 27.28 1.47 -3.52 x 10-12 -0.98 View
5 440 200 34.09 1.38 +6.03 x 10-13 +0.59 View
6 400 130 31.38 2.66 -8.88 x 10-13 -0.84 View
7 320 200 42.37 1.40 -3.85 x 10-12 -0.98 View
8 230 230 20.77 1.04 +1.54 x 10-12 +0.88 View
9 450 310 37.73 1.51 -9.41 x 10-13 -0.75 View
10 360 220 38.05 1.93 +2.43 x 10-13 +0.87 View
11 --- --- ---------- ------- -------------- ------ ----
12 500 290 34.31 1.34 +2.12 x 10-12 +0.93 View
13 190 180 26.37 1.17 +1.57 x 10-12 +0.79 View
14 300 220 30.71 1.29 -2.34 x 10-12 -0.93 View
15 350 240 30.49 1.09 +1.27 x 10-12 +0.50 View
16 360 210 35.92 2.26 -2.11 x 10-13 -0.79 View
17 350 150 11.30 1.12 -9.90 x 10-13 -0.95 View
18 330 230 51.96 1.59 -2.60 x 10-12 -0.66 View
19 300 60 4.04 0.19 -6.66 x 10-13 -1.00 View
20 340 170 31.27 1.65 +2.32 x 10-12 +0.85 View
21 290 220 16.83 0.72 +1.50 x 10-12 +0.93 View
22 450 260 21.14 1.66 +7.15 x 10-14 +0.09 View
23 370 230 36.15 1.12 +2.45 x 10-13 +0.59 View
24 310 200 32.00 1.30 +2.27 x 10-12 +0.84 View
25 430 280 31.44 1.09 +1.46 x 10-12 +0.82 View
26 350 250 23.44 1.40 -1.01 x 10-13 -0.63 View
27 320 210 20.44 1.06 +1.63 x 10-12 +0.97 View
28 --- --- ---------- ------- -------------- ------ ----
29 280 160 27.66 1.01 +2.51 x 10-13 +0.70 View
30 290 140 35.34 1.09 -2.96 x 10-12 -0.99 View
31 480 190 36.31 2.17 +3.96 x 10-13 +0.96 View
32 470 210 22.44 1.01 -3.44 x 10-14 -0.09 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.