SATELLITE ALTIMETER DATA FILTERING AND SMOOTHING IN THE COURSE OF GROUND-BASED RETRACKING
https://doi.org/10.32603/1993-8985-2019-22-2-13-21
Abstract
Introduction. Satellite radar altimeter is an essential part of the Earth remote sensing space missions. Satellite altimeter on-board delay-lock loop, by a widely shared concept, is operationally just a tool of a reliable retaining of received echo-signal within the tracking window, while “fine” altimetric parameter (orbit height, significant wave height, scattering cross section per unit of a probed surface, etc.) measuring is committed to the ground-based retracking of data. In particular, in the course of retracking altimeter data are being filtered and/or smoothed.
Objective. The paper subject is study of retracking algorithms of altimeter data transmitted from the space vehicle to the ground segment.
Methods and materials. It is known that data filtering already presents on-board the space vehicle and is implemented in delay-lock loop based on the α–β-filter. However, at the stage of ground-based retracking it seems more appropriate to use the Kalman filter, which possesses a number of theoretical optimal features and is efficient as for utilization of the available computational resource.
Results and conclusions. In the paper implementation of filtering and smoothing via Kalman algorithm is described. On the ground of computer simulation data it is stated that Kalman filtering and smoothing make estimate accuracy two and more times higher depending on significant wave height.
About the Authors
D. S. Borovitsky
JSC "Russian Institute of Radionavigation and Time"
Russian Federation
Cand. of Sci. (Engineering) (2016), leading researcher
Russian Federation
Cand. of Sci. (Engineering) (2016), leading researcher
A. E. Zhesterev
JSC "Russian Institute of Radionavigation and Time"
Russian Federation
Cand. of Sci. (Engineering) (1982), Chief of the Department
Russian Federation
Cand. of Sci. (Engineering) (1982), Chief of the Department
V. P. Ipatov
Saint Petersburg Electrotechnical University "LETI"
Russian Federation
Dr. of Sci. (Engineering) (1983), Professor (1985) of the Department of Radio Engineering Systems
Russian Federation
Dr. of Sci. (Engineering) (1983), Professor (1985) of the Department of Radio Engineering Systems
R. M. Mamchur
Saint Petersburg Electrotechnical University "LETI"
Russian Federation
Master of Science in Radio Engineering (2015), postgraduate student and assistant of the Department of Radio Engineering Systems
Russian Federation
Master of Science in Radio Engineering (2015), postgraduate student and assistant of the Department of Radio Engineering Systems
References
1. Coastal Altimetry; ed. by S. Vignudelli, A. G. Kostianoy, P. Cipollini, J. Benveniste. Berlin: Springer, 2011, 565 p.
2. Chelton D. B., Ries J. C., Haines B. J. et al. Satellite Altimetry. Satellite Altimetry and Earth Sciences: a Handbook of Techniques and Applications; ed. by L.-L. Fu and A. Cazenave. San Diego: Academic Press, 2001, pp. 1–132.
3. Borovitsky D. S., Zhesterev A. E., Ipatov V. P., Mamchur R. M. Study of Robust TOA Discriminators for Space-Based Radar Altimeter. Journal of the Russian Universities. Radioelectronics. 2018, no. 4, pp. 13–23. doi: 10.32603/1993-8985-2018-21-4-13-23 (In Russ.)
4. Borovitsky D. S., Zhesterev A. E., Ipatov V. P., Mamchur R. M. Estimation of Satellite Altimeter EchoSignal Parameters by Statistical Fitting Methods in the Course of Retracking. Journal of the Russian Universities. Radioelectronics. 2019, vol. 22, no. 1, pp. 5–16. doi: 10.32603/1993-8985-2019-22-1-5-16 (In Russ.)
5. Amarouche L., Thibaut P., Zanife O. Z., Dumont J.-P., Vincent P., Steunou N. Improving the Jason-1 Ground Retracking to Better Account for Attitude Effects. Marine Geodesy. 2004, vol. 27, no. 1–2, pp. 171–197. doi: 10.1080/01490410490465210
6. Zanife O. Z., Vincent P., Amarouche L., Dumont J.-P., Thibaut P., Labroue S. Comparison of the Ku-Band Range Noise Level and the Relative Sea-State Bias of the Jason-1, TOPEX, and Poseidon-1 Radar Altimeters. Marine Geodesy. 2003, vol. 26, no. 3–4, pp. 201–238. (Special Issue: Jason-1 Calibration/Validation). doi: 10.1080 /714044519
7. Steunou N., Desjonquères J. D., Picot N., Sengenes P., Noubel J., Poisson J. C. AltiKa Altimeter: Instrument Description and in Flight Performance. Marine Geodesy. 2015, vol. 38, no. 1, pp. 22–42. doi: 10.1080/01490419.2015.1006381
8. Satellite Altimetry in Geodesy and Oceanography; ed. by R. Rummel and F. Sanso. Berlin, Springer, 1993, 479 p.
9. Sage A. P., Melsa J. L. Estimation Theory with Application to Communication and Control. New York, McGraw-Hill, 1971, 529 p.
10. Brown R. G., Hwang P. Introduction to Random Signals and Applied Kalman Filtering. 4th ed. New York, John Wiley & Sons, 2012, 397 p.
11. Grewal M. S., Andrews A. Kalman Filtering: Theory and Practice Using MATLAB. 2th ed. New York, John Wiley & Sons, 2001, 401 p.
12. Desjonquères J. D., Carayon G., Steunou N., Lambin J. Poseidon-3 Radar Altimeter: New Modes and in-Flight Performances. Marine Geodesy. 2010, vol. 33, pp. 53–79. doi: 10.1080/01490419.2010.488970
13. Rodriguez E., Martin J. M. Correlation Properties of Ocean Altimeter Returns. IEEE Trans. on Geoscience and Remote Sensing. 1994, vol. GRS-32, no. 3, pp. 553– 561. doi: 10.1109/36.297974
14. Webb D. J., Moore A. Assimilation of Altimeter Data into Ocean Models. J. of Physical Oceanography. 1986, vol. 16, pp. 1901–1913. doi: 10.1175/1520-0485(1986) 0162.0.CO;2
15. Marshall J. C. Determining the Ocean Circulation and Improving the Geoid from Satellite Altimetry. J. of Physical Oceanography, 1985, vol. 15, pp. 330–349. doi: 10.1175/1520-0485(1985)0152.0.CO;2
16. Mellor G. L., Ezer T. A Gulf Stream Model and an Altimetry Assimilation Scheme. J. of Geophysical Research. 1991, vol. 96, pp. 8779–8795. doi: 10.1029/91JC00383
17. Meditch J. S. Stochastic Optimal Linear Estimation and Control. New York, McGraw-Hill, 1969, 394 p.
Review
For citations:
Borovitsky D.S., Zhesterev A.E., Ipatov V.P., Mamchur R.M. SATELLITE ALTIMETER DATA FILTERING AND SMOOTHING IN THE COURSE OF GROUND-BASED RETRACKING. Journal of the Russian Universities. Radioelectronics. 2019;22(2):13-21. (In Russ.) https://doi.org/10.32603/1993-8985-2019-22-2-13-21
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