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 Date2021-09-13
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 2Observatorio NacionalID Number010Baseline4438.348 km
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

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 -161.24 27.77 +5.80 x 10-14 +0.19




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 4.50 x 10-12
0 h, 20 min 140 2.89 x 10-12
0 h, 40 min 136 2.13 x 10-12
1 h, 20 min 128 1.83 x 10-12
2 h, 40 min 112 9.65 x 10-13
5 h, 20 min 80 4.40 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 1.56
0 h, 20 min 139 1.63
0 h, 40 min 133 2.24
1 h, 20 min 121 3.97
2 h, 40 min 97 2.77
5 h, 20 min 49 5.40


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
1 250 200 17.43 1.35 +1.00 x 10-12 +0.79 View
2 520 150 9.39 0.58 -1.23 x 10-12 -0.93 View
3 570 360 18.40 1.51 -2.36 x 10-13 -0.31 View
4 220 150 23.09 0.70 -2.70 x 10-12 -0.93 View
5 440 200 20.55 2.64 +6.55 x 10-14 +0.12 View
6 420 150 28.67 1.61 -1.04 x 10-12 -0.94 View
7 310 190 37.74 0.91 -3.25 x 10-12 -0.97 View
8 230 220 17.31 1.41 +1.08 x 10-12 +0.73 View
9 440 300 29.41 1.71 -1.07 x 10-12 -0.91 View
10 360 230 34.65 1.25 +2.39 x 10-13 +0.84 View
11 --- --- ---------- ------- -------------- ------ ----
12 490 270 27.20 0.87 +1.62 x 10-12 +0.81 View
13 200 200 23.23 1.04 +1.52 x 10-12 +0.89 View
14 300 230 31.94 0.91 -2.49 x 10-12 -0.96 View
15 350 230 31.75 1.18 +2.18 x 10-12 +0.90 View
16 360 200 24.44 1.66 -1.55 x 10-13 -0.71 View
17 370 170 18.56 1.21 -1.69 x 10-12 -0.96 View
18 330 240 51.96 2.08 -2.71 x 10-12 -0.80 View
19 310 60 9.57 0.22 -1.43 x 10-12 -0.97 View
20 340 170 34.38 1.57 +2.66 x 10-12 +0.95 View
21 290 230 19.47 1.01 +1.41 x 10-12 +0.96 View
22 440 250 24.58 1.52 +6.11 x 10-14 +0.07 View
23 360 220 48.41 0.69 +3.07 x 10-13 +0.59 View
24 320 210 35.89 1.21 +2.89 x 10-12 +0.94 View
25 410 270 34.67 0.87 +1.47 x 10-12 +0.81 View
26 350 250 29.73 1.53 -1.28 x 10-13 -0.72 View
27 320 210 25.96 1.00 +2.04 x 10-12 +0.94 View
28 --- --- ---------- ------- -------------- ------ ----
29 290 170 29.82 1.44 +4.80 x 10-14 +0.16 View
30 290 150 31.55 0.94 -2.88 x 10-12 -1.00 View
31 480 190 33.32 1.42 +3.17 x 10-13 +0.92 View
32 470 210 24.91 1.08 -7.58 x 10-14 -0.26 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.