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3. Single-site GPS models

Author

Goad, Clyde C., Bhattacharji, S., editor, Friedman, G. M., editor, Neugebauer, H. J., editor, Seilacher, A., editor, Kleusberg, Alfred, editor, and Teunissen, Peter J. G., editor

Published
1996
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4. Short distance GPS models

Author

Goad, Clyde C., Bhattacharji, S., editor, Friedman, G. M., editor, Neugebauer, H. J., editor, Seilacher, A., editor, Kleusberg, Alfred, editor, and Teunissen, Peter J. G., editor

Published
1996
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7. Investigation for improving Global Positioning System (GPS) orbits using a discrete sequential estimator and stochastic models of selected physical processes

Author

Goad, Clyde C and Chadwell, C. David

Subjects
Aircraft Communications And Navigation
Abstract

GEODYNII is a conventional batch least-squares differential corrector computer program with deterministic models of the physical environment. Conventional algorithms were used to process differenced phase and pseudorange data to determine eight-day Global Positioning system (GPS) orbits with several meter accuracy. However, random physical processes drive the errors whose magnitudes prevent improving the GPS orbit accuracy. To improve the orbit accuracy, these random processes should be modeled stochastically. The conventional batch least-squares algorithm cannot accommodate stochastic models, only a stochastic estimation algorithm is suitable, such as a sequential filter/smoother. Also, GEODYNII cannot currently model the correlation among data values. Differenced pseudorange, and especially differenced phase, are precise data types that can be used to improve the GPS orbit precision. To overcome these limitations and improve the accuracy of GPS orbits computed using GEODYNII, we proposed to develop a sequential stochastic filter/smoother processor by using GEODYNII as a type of trajectory preprocessor. Our proposed processor is now completed. It contains a correlated double difference range processing capability, first order Gauss Markov models for the solar radiation pressure scale coefficient and y-bias acceleration, and a random walk model for the tropospheric refraction correction. The development approach was to interface the standard GEODYNII output files (measurement partials and variationals) with software modules containing the stochastic estimator, the stochastic models, and a double differenced phase range processing routine. Thus, no modifications to the original GEODYNII software were required. A schematic of the development is shown. The observational data are edited in the preprocessor and the data are passed to GEODYNII as one of its standard data types. A reference orbit is determined using GEODYNII as a batch least-squares processor and the GEODYNII measurement partial (FTN90) and variational (FTN80, V-matrix) files are generated. These two files along with a control statement file and a satellite identification and mass file are passed to the filter/smoother to estimate time-varying parameter states at each epoch, improved satellite initial elements, and improved estimates of constant parameters.

Published
1993

19. Geodesy

Author

Goad, Clyde C., primary and Mueller, Ivan I., additional

Published
2003
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21. Conclusions and recommendations.

Author

Bhattacharji, Somdev, Friedman, Gerald M., Neugebauer, Horst J., Seilacher, Adolf, Dickey, Jean O., Gilbert, Freeman, Goad, Clyde C., Kaula, William M., Melbourne, William G., Reigber, Christoph, Schutz, Bob E., Turcotte, Donald L., Mueller, Ivan I., and Zerbini, S.

Published
1989
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22. Appendix 5 The LAGEOS II project.

Author

Bhattacharji, Somdev, Friedman, Gerald M., Neugebauer, Horst J., Seilacher, Adolf, Dickey, Jean O., Gilbert, Freeman, Goad, Clyde C., Kaula, William M., Melbourne, William G., Reigber, Christoph, Schutz, Bob E., Turcotte, Donald L., Mueller, Ivan I., Zerbini, S., and Zerbini, Susanna

Published
1989
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23. Appendix 6 The Wegener programme.

Author

Bhattacharji, Somdev, Friedman, Gerald M., Neugebauer, Horst J., Seilacher, Adolf, Dickey, Jean O., Gilbert, Freeman, Goad, Clyde C., Kaula, William M., Melbourne, William G., Reigber, Christoph, Schutz, Bob E., Turcotte, Donald L., Mueller, Ivan I., Zerbini, S., and Wilson, Peter

Abstract

The WEGENER concept was presented in an attempt to facilitate large scale multidisciplinary investigations covering a whole region embracing different nations with different political backgrounds. The successes achieved to date serve to underline the urgency of the problems being addressed to the nations involved, which are not in a position to finance extensive investigations applying state of the art technology alone. The processes under examination necessitate repeated observations over long time periods. As a result, it is extremely important to obtain first observations as early as possible, though this may incur added expense. The WEGENER-MEDLAS Project established the necessary framework for follow-up activities and set standards for international cooperation which can be emulated in other regions of the globe confronted with similar problems. [ABSTRACT FROM AUTHOR]

Published
1989
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25. Appendix 1 The earth observation activities of the European space agency.

Author

Bhattacharji, Somdev, Friedman, Gerald M., Neugebauer, Horst J., Seilacher, Adolf, Dickey, Jean O., Gilbert, Freeman, Goad, Clyde C., Kaula, William M., Melbourne, William G., Reigber, Christoph, Schutz, Bob E., Turcotte, Donald L., Mueller, Ivan I., Zerbini, S., and Pfeiffer, B. R. K.

Abstract

It is the aim of the European Space Agency to provide, within existing overall budget constraints, data and mission continuity to the many disciplines of Earth Observation and to maintain also the necessary flexibility to cope with future Earth Observation data needs. It is foreseen to achieve these objectives through a large contribution to worldwide international activities and the collaboration of other international partners. [ABSTRACT FROM AUTHOR]

Published
1989
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26. Chapter 8 education.

Author

Bhattacharji, Somdev, Friedman, Gerald M., Neugebauer, Horst J., Seilacher, Adolf, Dickey, Jean O., Gilbert, Freeman, Goad, Clyde C., Kaula, William M., Melbourne, William G., Reigber, Christoph, Schutz, Bob E., Turcotte, Donald L., Mueller, Ivan I., Ashour, A., Birardi, G., Caputo, M., Christodoulidis, D., Harrison, C., Rais, J., and Schutz, B.

Published
1989
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27. Chapter 7 Reference coordinate systems.

Author

Bhattacharji, Somdev, Friedman, Gerald M., Neugebauer, Horst J., Seilacher, Adolf, Dickey, Jean O., Gilbert, Freeman, Goad, Clyde C., Kaula, William M., Melbourne, William G., Reigber, Christoph, Schutz, Bob E., Turcotte, Donald L., Zerbini, S., and Mueller, Ivan I.

Published
1989
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28. Chapter 6 data analysis.

Author

Bhattacharji, Somdev, Friedman, Gerald M., Neugebauer, Horst J., Seilacher, Adolf, Dickey, Jean O., Gilbert, Freeman, Goad, Clyde C., Kaula, William M., Melbourne, William G., Reigber, Christoph, Schutz, Bob E., Turcotte, Donald L., Mueller, Ivan I., Zerbini, S., Barlier, Francois, Beard, Ron, Cenci, Alberto, Columbo, Oscar, Eanes, Richard, and Goad, Clyde

Published
1989
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29. Chapter 5 instrumentation.

Author

Bhattacharji, Somdev, Friedman, Gerald M., Neugebauer, Horst J., Seilacher, Adolf, Dickey, Jean O., Gilbert, Freeman, Goad, Clyde C., Kaula, William M., Melbourne, William G., Reigber, Christoph, Schutz, Bob E., Turcotte, Donald L., Mueller, Ivan I., and Zerbini, S.

Published
1989
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30. Chapter 4 interaction with other disciplines and programs.

Author

Bhattacharji, Somdev, Friedman, Gerald M., Neugebauer, Horst J., Seilacher, Adolf, Dickey, Jean O., Gilbert, Freeman, Goad, Clyde C., Kaula, William M., Melbourne, William G., Reigber, Christoph, Schutz, Bob E., Turcotte, Donald L., Mueller, Ivan I., Zerbini, S., Anderson, A., Gilbert, F., Grassl, H., Harrison, E., Hide, R., and Houry, S.

Published
1989
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31. Chapter 3 long term dynamics of the solid earth.

Author

Bhattacharji, Somdev, Friedman, Gerald M., Neugebauer, Horst J., Seilacher, Adolf, Dickey, Jean O., Gilbert, Freeman, Goad, Clyde C., Kaula, William M., Melbourne, William G., Reigber, Christoph, Schutz, Bob E., Turcotte, Donald L., Mueller, Ivan I., Zerbini, S., Agnew, D. C., Burke, K., Cazenave, A., Dixon, T., Hager, B. H., and Heirtzler, J. R.

Published
1989
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32. Earth tides.

Author

Bhattacharji, Somdev, Friedman, Gerald M., Neugebauer, Horst J., Seilacher, Adolf, Dickey, Jean O., Gilbert, Freeman, Goad, Clyde C., Kaula, William M., Melbourne, William G., Reigber, Christoph, Schutz, Bob E., Turcotte, Donald L., Mueller, Ivan I., Zerbini, S., and Zschau, J.

Published
1989
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33. Axial rate of spin of the earth.

Author

Bhattacharji, Somdev, Friedman, Gerald M., Neugebauer, Horst J., Seilacher, Adolf, Dickey, Jean O., Gilbert, Freeman, Goad, Clyde C., Kaula, William M., Melbourne, William G., Reigber, Christoph, Schutz, Bob E., Turcotte, Donald L., Mueller, Ivan I., Zerbini, S., and Dickey, J. O.

Published
1989
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34. Polar motion.

Author

Bhattacharji, Somdev, Friedman, Gerald M., Neugebauer, Horst J., Seilacher, Adolf, Dickey, Jean O., Gilbert, Freeman, Goad, Clyde C., Kaula, William M., Melbourne, William G., Reigber, Christoph, Schutz, Bob E., Turcotte, Donald L., Mueller, Ivan I., Zerbini, S., and Dickman, S. R.

Published
1989
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35. Precession and nutation.

Author

Bhattacharji, Somdev, Friedman, Gerald M., Neugebauer, Horst J., Seilacher, Adolf, Dickey, Jean O., Gilbert, Freeman, Goad, Clyde C., Kaula, William M., Melbourne, William G., Reigber, Christoph, Schutz, Bob E., Turcotte, Donald L., Mueller, Ivan I., Zerbini, S., and Herring, T. A.

Published
1989
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36. Chapter 1 introduction.

Author

Bhattacharji, Somdev, Friedman, Gerald M., Neugebauer, Horst J., Seilacher, Adolf, Dickey, Jean O., Gilbert, Freeman, Goad, Clyde C., Melbourne, William G., Reigber, Christoph, Schutz, Bob E., Turcotte, Donald L., Mueller, Ivan I., Zerbini, S., and Kaula, William M.

Published
1989
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38. Single-site GPS models.

Author

Bhattacharji, S., Friedman, G. M., Neugebauer, H. J., Seilacher, A., Kleusberg, Alfred, Teunissen, Peter J. G., and Goad, Clyde C.

Published
1996
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46. Appendix 4 Space geodesy in France.

Author

Bhattacharji, Somdev, Friedman, Gerald M., Neugebauer, Horst J., Seilacher, Adolf, Dickey, Jean O., Gilbert, Freeman, Goad, Clyde C., Kaula, William M., Melbourne, William G., Reigber, Christoph, Schutz, Bob E., Turcotte, Donald L., Mueller, Ivan I., Zerbini, S., and Cazenave, Anny

Published
1989
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47. Introduction.

Author

Bhattacharji, Somdev, Friedman, Gerald M., Neugebauer, Horst J., Seilacher, Adolf, Dickey, Jean O., Gilbert, Freeman, Goad, Clyde C., Kaula, William M., Melbourne, William G., Reigber, Christoph, Schutz, Bob E., Turcotte, Donald L., Mueller, Ivan I., Zerbini, S., Dickey, J. O., Herring, T. A., O'Connell, R. J., and Smylie, D. E.

Published
1989
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48. Kinematic Survey of Clinton Lake Dam

Author

Goad, Clyde C.

Abstract

Kinematic survey phase data are reduced using a standard double difference formulation when the initial integer values of the biases are known or determined. Two experimental results are presented. A byproduct of the reduction was the generation of a measure of success similar to the Geometrical Dilution of Precision (GDOP) familiar to those using measurements of pseudo ranges. This new measure is called RDOP for Relative Dilution of Precision.

Published
1989

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