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

Laboratory 1National Institute of Standards and TechnologyID Number006End Date2021-09-13
Latitude 39° 59 min 44.579 s NCounter Delay 0.42 nsReference SourceSIMT(NIST)
Longitude105° 15 min 43.185 s WREF Delay 433.4 nsMask Angle10°
Altitude1646.72 mReceiver Delay-5.4 nsReceiver Temp.28 °C
Laboratory 2Observatorio NacionalID Number010Baseline8623.512 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 -22.35 12.52 +3.15 x 10-14 +0.23




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 133 6.17 x 10-12
0 h, 20 min 131 3.53 x 10-12
0 h, 40 min 127 1.98 x 10-12
1 h, 20 min 119 1.22 x 10-12
2 h, 40 min 103 6.17 x 10-13
5 h, 20 min 71 2.96 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 133 2.14
0 h, 20 min 130 1.82
0 h, 40 min 124 1.75
1 h, 20 min 112 2.07
2 h, 40 min 88 2.08
5 h, 20 min 40 2.61


SIMT(NIST) - 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
1 410 110 9.10 2.04 -8.91 x 10-13 -0.65 View
2 350 0 0.00 0.00 0.00 x 10 0 0.00 View
3 380 20 5.72 0.00 -9.53 x 10-12 -1.00 View
4 370 90 5.50 2.03 +6.28 x 10-13 +0.47 View
5 320 80 5.42 2.33 +6.22 x 10-13 +0.39 View
6 320 70 12.55 0.77 -5.84 x 10-13 -0.89 View
7 390 100 7.81 3.12 +2.75 x 10-13 +0.22 View
8 380 130 13.44 2.50 -2.45 x 10-13 -0.16 View
9 330 60 10.30 2.03 +3.04 x 10-12 +0.89 View
10 340 100 7.70 1.86 -5.57 x 10-13 -0.43 View
11 --- --- ---------- ------- -------------- ------ ----
12 300 0 0.00 0.00 0.00 x 10 0 0.00 View
13 340 130 10.25 1.77 -5.78 x 10-13 -0.52 View
14 380 120 9.85 1.91 +8.93 x 10-13 +0.68 View
15 320 110 10.24 1.68 -3.74 x 10-13 -0.29 View
16 380 110 8.73 1.31 -6.02 x 10-14 -0.04 View
17 350 60 4.26 1.87 -1.10 x 10-12 -0.73 View
18 390 120 18.46 2.90 -5.13 x 10-13 -0.21 View
19 350 70 5.09 1.20 +1.08 x 10-12 +0.82 View
20 340 100 6.93 1.90 -2.24 x 10-13 -0.27 View
21 370 20 3.90 0.00 +6.50 x 10-12 +1.00 View
22 330 20 4.29 0.00 -7.15 x 10-12 -1.00 View
23 370 90 16.10 1.36 -3.32 x 10-12 -0.93 View
24 420 110 14.24 0.88 +1.61 x 10-12 +0.82 View
25 360 70 10.81 2.63 +4.57 x 10-13 +0.14 View
26 360 120 13.65 1.58 +4.14 x 10-14 +0.27 View
27 410 90 8.21 1.35 +1.40 x 10-12 +0.88 View
28 --- --- ---------- ------- -------------- ------ ----
29 330 60 5.54 2.36 +3.21 x 10-13 +0.15 View
30 320 20 1.18 0.00 +1.97 x 10-12 +1.00 View
31 320 40 12.59 0.00 +1.61 x 10-13 +0.98 View
32 320 40 3.90 1.87 +1.01 x 10-12 +0.46 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.