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| PCV Calibration of GPS Antennas Absolute PCV Field Calibration Discussion of Absolute PCV Absolute PCV Calibration of AOAD/M_T Absolute PCV Results of AOAD/M_T Summary Publications (including pdf-downloads) |
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| Absolute PCV Calibration of AOAD/M_T - Details,
Accuracy, Precision Absolute PCV Results of AOAD/M_T The Allen Osborne Associates Dorne Margolin Model T (AOAD/M_T), serial number (SN) 404 has been extensively calibrated using the automated real-time absolute PCV field calibration method by IfE and Geo++® There were in total 42 calibrations, which were combined using the complete variance-covariance matrix of the individual results for a combined PCV estimation. The calibrations differ by location, constellation (robot, satellites, weather, ...) and date. Spherical harmonics of degree 8 and order 5 were used for all real-time calibrations and for the final PCV model. The absolute PCV are given in meter using the sign convention of the Geo++ antenna file format, which is opposite to the IGS/NGS. The graphics show the L1 and L2 PCV after removing the offset OFFSETS L1=+0.00060 -0.00046 +0.09124
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| The PCV vary for L1 over a range of approximately 20 mm and for L2 over 14 mm (click on the images - L1, left / L2, right - for a high resolution jpg). | |||
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| Standard Deviation The standard deviation is generally homogeneous for all azimuths and is in the order of 0.3-0.5 mm for most of the elevation ranges with a slight degradation to 1-2 mm for elevations below 5 deg. The large number of combined calibrations of the AOAD/M_T gives a too optimistic standard deviation well below 0.1 mm, but with the same elevation dependent degradation (click on the images - L1, left / L2, right - for a high resolution jpg). Nevertheless, the overall standard deviation of the 42 combined calibrations is at the 0.2 mm level. |
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| Repeatability The repeatability is derived from independent calibrations at two sites (identical antenna). The repeatability gives values between 0.5 to 1 mm in the elevation range from 90 to 10 deg. For the elevation range from 10 to 0 deg the repeatability shows higher differences above 1 mm, which can individually amount to some mm at the horizon. However, the mean repeatability is generally at the 0.5 to 1 mm level. The following graphics are the difference in PCV from one calibration done by IfE and one by Geo++®. The robots, the locations and the general conditions were different. The calibrations were selected by chance. For an operational calibration always two calibrations are combined, which gives a better repeatability than presented here. For the repeatability, the PCV were reduced to the same height offset (combined solution) with no horizontal offsets (included in the PCV). (Click on the images - L1, left / L2, right - for a high resolution jpg) |
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| Individual Sets of PCV Calibrations The following survey indicates the individual calibrations, which were input to the combined solution of absolute PCV for the AOAD/M_T, SN 404. The number of epochs differ due to different options in the automated guidance of the real-time calibrations. Listed are an internal counter, date, local time, number of epochs and the standard deviation of weight unit of the simulataneous real-time processing of both GPS frequencies for the AOAD/M_T GPS antenna.
5 Date: 2000-04-13 08:28:51 Epochs: 11463 s0: 0.670 6 Date: 2000-04-14 07:43:06 Epochs: 16068 s0: 0.712 7 Date: 2000-04-15 14:39:25 Epochs: 10697 s0: 0.640 8 Date: 2000-04-17 12:34:08 Epochs: 11847 s0: 0.611 9 Date: 2000-05-22 14:21:46 Epochs: 6987 s0: 0.702
2 Date: 2000-04-29 15:03:43 Epochs: 6311 s0: 0.850 3 Date: 2000-04-29 22:15:24 Epochs: 11239 s0: 0.800 5 Date: 2000-04-30 20:12:03 Epochs: 12937 s0: 0.697 6 Date: 2000-05-01 01:02:46 Epochs: 6465 s0: 0.745 8 Date: 2000-05-01 13:53:15 Epochs: 15594 s0: 0.672 9 Date: 2000-05-02 03:55:00 Epochs: 6655 s0: 0.854 10 Date: 2000-05-23 12:56:17 Epochs: 11711 s0: 0.732 11 Date: 2000-05-23 16:55:27 Epochs: 7433 s0: 0.888 12 Date: 2000-05-23 19:20:23 Epochs: 7103 s0: 0.919 13 Date: 2000-05-24 11:34:19 Epochs: 7267 s0: 0.674 14 Date: 2000-05-24 13:57:43 Epochs: 6779 s0: 0.830 15 Date: 2000-05-24 17:36:01 Epochs: 5721 s0: 1.013 16 Date: 2000-05-24 19:51:57 Epochs: 5829 s0: 0.612 17 Date: 2000-05-24 21:55:43 Epochs: 5235 s0: 0.600 18 Date: 2000-05-24 23:42:41 Epochs: 5573 s0: 0.675 19 Date: 2000-05-25 01:34:12 Epochs: 6120 s0: 0.915 21 Date: 2000-05-25 13:04:55 Epochs: 7127 s0: 0.651 22 Date: 2000-05-25 15:32:38 Epochs: 3283 s0: 0.861 23 Date: 2000-05-25 18:01:14 Epochs: 10867 s0: 0.724 24 Date: 2000-05-25 22:02:56 Epochs: 6575 s0: 0.636 25 Date: 2000-05-26 00:25:17 Epochs: 6347 s0: 0.750 26 Date: 2000-05-26 10:18:44 Epochs: 6145 s0: 0.792 27 Date: 2000-05-26 12:24:13 Epochs: 5599 s0: 0.641 28 Date: 2000-05-26 14:17:33 Epochs: 7711 s0: 0.807 29 Date: 2000-05-26 16:50:23 Epochs: 5879 s0: 0.826 30 Date: 2000-05-26 18:45:02 Epochs: 6151 s0: 0.721 31 Date: 2000-05-26 20:58:25 Epochs: 7193 s0: 0.597 32 Date: 2000-05-26 23:32:22 Epochs: 6865 s0: 0.728 33 Date: 2000-05-27 10:46:42 Epochs: 11933 s0: 0.635 34 Date: 2000-05-27 15:15:16 Epochs: 6977 s0: 0.886 35 Date: 2000-05-27 17:39:17 Epochs: 7159 s0: 0.836 36 Date: 2000-05-27 20:07:39 Epochs: 6399 s0: 0.655 37 Date: 2000-05-27 22:25:35 Epochs: 6845 s0: 0.663 38 Date: 2000-05-28 00:42:42 Epochs: 8019 s0: 0.809 39 Date: 2000-05-28 03:24:06 Epochs: 6217 s0: 0.861 |
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Azimuthal PCV L0 (offset and
elevation dependent terms removed).
| last change
25.02.2008 by webmaster Institute of Geodesy |
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| Schneiderberg 50 · D-30167 Hannover · Tel.: (++ 49) 511 762 2795 · Fax.: (++ 49) 511 762 4006 |
| email: office · email: webmaster |