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

Laboratory 1Antigua and Barbuda Bureau of StandardsID Number023End Date2021-09-13
Latitude 17° 7 min 34.395 s NCounter Delay 0.24 nsReference SourceSIMT(ABBS)
Longitude 61° 49 min 18.409 s WREF Delay 1.7 nsMask Angle10°
Altitude5.50 mReceiver Delay130.7 nsReceiver Temp.33 °C
Laboratory 2Centro Nacional de Metrologia de Panama AIPID Number009Baseline2114.072 km
Latitude 9° 0 min 3.590 s NCounter Delay -0.10 nsReference SourceSIMT(CNMP)
Longitude 79° 35 min 5.880 s WREF Delay 45.66 nsMask Angle10°
Altitude47.23 mReceiver Delay122.1 nsReceiver Temp.27 °C

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 -17.10 27.43 -1.31 x 10-13 -0.45




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 142 4.79 x 10-12
0 h, 20 min 140 3.06 x 10-12
0 h, 40 min 136 2.15 x 10-12
1 h, 20 min 128 1.67 x 10-12
2 h, 40 min 112 1.24 x 10-12
5 h, 20 min 80 3.82 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 142 1.66
0 h, 20 min 139 1.65
0 h, 40 min 133 2.22
1 h, 20 min 121 3.67
2 h, 40 min 97 4.80
5 h, 20 min 49 4.10


SIMT(ABBS) - SIMT(CNMP)
(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
1 320 260 23.66 3.44 +3.59 x 10-13 +0.28 View
2 480 470 39.39 2.48 -4.84 x 10-13 -0.46 View
3 430 330 34.35 2.84 +1.59 x 10-13 +0.24 View
4 320 220 18.13 3.33 +5.98 x 10-13 +0.44 View
5 460 390 40.57 3.41 -9.24 x 10-13 -0.59 View
6 340 240 23.04 3.91 +3.38 x 10-13 +0.30 View
7 310 310 31.04 2.56 -8.84 x 10-13 -0.50 View
8 310 140 31.53 0.82 +3.41 x 10-12 +0.95 View
9 430 290 30.73 3.51 +1.39 x 10-13 +0.18 View
10 330 330 34.51 2.46 +1.97 x 10-13 +0.69 View
11 --- --- ---------- ------- -------------- ------ ----
12 420 350 35.95 2.99 -4.87 x 10-13 -0.57 View
13 340 210 27.49 1.10 +3.10 x 10-13 +0.18 View
14 340 340 32.91 2.00 +1.67 x 10-13 +0.10 View
15 420 310 34.23 3.65 -6.14 x 10-13 -0.33 View
16 430 290 40.14 3.46 -2.62 x 10-13 -0.47 View
17 300 190 29.48 1.80 +2.58 x 10-13 +0.15 View
18 320 290 38.88 2.86 -1.02 x 10-12 -0.58 View
19 370 260 35.04 2.39 -3.85 x 10-13 -0.35 View
20 360 210 28.25 2.19 +1.01 x 10-12 +0.47 View
21 260 190 39.72 2.03 +1.44 x 10-12 +0.56 View
22 370 240 30.31 6.54 -1.02 x 10-13 -0.13 View
23 330 290 35.49 1.87 +1.37 x 10-13 +0.24 View
24 290 170 14.45 1.19 -3.19 x 10-13 -0.27 View
25 250 180 27.58 2.84 +1.51 x 10-12 +0.76 View
26 420 300 54.68 2.97 -3.47 x 10-13 -0.82 View
27 300 260 21.59 2.11 +1.15 x 10-12 +0.87 View
28 --- --- ---------- ------- -------------- ------ ----
29 440 190 37.22 3.41 -3.41 x 10-12 -0.93 View
30 250 130 15.98 2.53 -4.13 x 10-13 -0.37 View
31 430 390 52.88 3.61 -7.01 x 10-14 -0.21 View
32 450 440 43.50 2.40 -2.82 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.