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

Laboratory 1Trinidad & Tobago Bureau of Standards ID Number020End Date2021-09-13
Latitude 10° 38 min 27.420 s NCounter Delay 1.03 nsReference SourceSIMT(TTBS)
Longitude 61° 22 min 51.969 s WREF Delay 3.7 nsMask Angle10°
Altitude-12.34 mReceiver Delay177.2 nsReceiver Temp.32 °C
Laboratory 2Observatorio NacionalID Number010Baseline4128.416 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 -294.01 13.52 +4.86 x 10-14 +0.37




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 4.95 x 10-12
0 h, 20 min 140 4.02 x 10-12
0 h, 40 min 136 2.67 x 10-12
1 h, 20 min 128 1.23 x 10-12
2 h, 40 min 112 6.79 x 10-13
5 h, 20 min 80 2.68 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 1.72
0 h, 20 min 139 2.26
0 h, 40 min 133 2.67
1 h, 20 min 121 2.30
2 h, 40 min 97 2.49
5 h, 20 min 49 1.62


SIMT(TTBS) - 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
1 300 220 10.80 0.98 +2.83 x 10-13 +0.36 View
2 480 160 17.25 2.21 +6.76 x 10-13 +0.45 View
3 380 210 10.01 1.71 +4.90 x 10-14 +0.06 View
4 240 170 19.41 1.58 -1.85 x 10-13 -0.37 View
5 480 250 18.06 2.51 -5.97 x 10-14 -0.15 View
6 460 260 23.48 1.83 -4.04 x 10-13 -0.70 View
7 320 200 33.60 4.45 -1.29 x 10-12 -0.58 View
8 350 210 18.74 1.44 -5.47 x 10-13 -0.51 View
9 500 330 29.94 1.72 -6.50 x 10-13 -0.65 View
10 340 230 18.81 2.60 +7.82 x 10-14 +0.65 View
11 --- --- ---------- ------- -------------- ------ ----
12 370 140 28.07 2.01 -7.29 x 10-13 -0.63 View
13 300 220 17.61 1.79 -2.49 x 10-13 -0.26 View
14 320 220 13.84 2.10 -2.99 x 10-13 -0.27 View
15 380 200 19.94 1.67 -4.66 x 10-13 -0.38 View
16 380 170 34.85 2.35 +1.53 x 10-13 +0.52 View
17 250 160 13.56 1.24 +7.90 x 10-13 +0.69 View
18 320 230 29.52 3.47 +6.03 x 10-13 +0.35 View
19 380 200 14.25 1.47 -1.02 x 10-12 -0.77 View
20 440 250 41.20 2.10 +2.63 x 10-13 +0.30 View
21 270 150 12.59 1.08 +4.27 x 10-13 +0.37 View
22 480 290 28.03 1.83 -1.15 x 10-12 -0.88 View
23 340 220 18.21 1.51 -3.10 x 10-14 -0.20 View
24 240 190 20.09 1.68 +5.32 x 10-13 +0.38 View
25 320 250 24.74 2.04 -1.20 x 10-12 -0.73 View
26 360 160 17.09 1.38 +7.42 x 10-14 +0.55 View
27 250 200 17.04 2.72 +1.21 x 10-13 +0.09 View
28 --- --- ---------- ------- -------------- ------ ----
29 400 270 27.60 2.81 +7.34 x 10-14 +0.32 View
30 190 50 6.29 0.59 -2.83 x 10-12 -0.95 View
31 490 210 33.37 1.79 +2.29 x 10-13 +0.73 View
32 440 230 15.26 1.53 +1.15 x 10-13 +0.64 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.