STUDY OF ROBUST TOA DISCRIMINATORS FOR SPACE-BASED RADAR ALTIMETER
https://doi.org/10.32603/1993-8985-2018-21-4-13-23
Abstract
This paper provides a study of robust TOA discriminators used in ground-based retracking of a space-based altimeter da-ta. Requirements to an on-board TOA tracking loop are limited to reliable locking of received echo-signal within the tracking window, while fine measuring of altimetry parameters (orbit height, SWH, etc.) is a task of the Earth-based retracking. In the robust algorithms TOA-measuring is performed without using any echo physical model. It can improve space-based altimeter operation near the coastline where terrain areas falling into the illuminated spot distort the received signal significantly versus the one from the “pure” water surface. Analytic calculation of noise errors is fulfilled for the OCOG. Besides, the threshold discriminators and simulation results are presented, as well as comparison of the robust discriminators against the optimal (within the classical model framework) one. Despite the robust types yield to the optimal one in the accuracy of TOA estimate, the loss is not catastrophic and often can be treated as an acceptable pay-ment for low sensibility to the deviation of scattering characteristics of a sounded surface from classical models.
About the Authors
D. S. BorovitskyRussian Federation
Dmitry S. Borovitsky – Ph.D. in Engineering (2016), leading research fellow of JSC "Russian Institute of Radionavigation and Time" (Saint Petersburg). The author of 22 scientific publications. Area of expertise: broadband radiolocation and radionavigation systems; signal theory.
120, Obukhovskoy Oborony Pr., bld. EC, 192012, St. Petersburg.
A. E. Zhesterev
Russian Federation
Alexander E. Zhesterev – Ph.D. in Engineering (1982), Chief of the Department of JSC "Russian Institute of Radionavigation and Time" (Saint Petersburg). The author of 31 scientific publications. Area of expertise: radiolocation and radionavigation systems; communication theory.
120, Obukhovskoy Oborony Pr., bld. EC, 192012, St. Petersburg.
V. P. Ipatov
Russian Federation
Valery P. Ipatov – D.Sc. in Engineering (1983), Professor (1985) of the Department of Radio Engineering Systems of Saint Petersburg Electrotechnical University "LETI". Honored scientist of the RF (2001), honorable radioman of the USSR (1983). The author of more than 300 scientific publications. Area of expertise: radio-electronic system engineering; statistical communication theory; broadband radar, navigation and data systems; signal theory.
5, Professor Popov Str., 197376, St. Petersburg.
R. M. Mamchur
Russian Federation
Ruslan M. Mamchur – Master of Science in Radio Engineering (2015), post-graduate student and assistant of the Department of Radio Engineering Systems of Saint Petersburg Electrotechnical University "LETI". The author of 11 scientific publications. Area of expertise: statistical communication theory; broadband radar, navigation and data systems; signal theory; technical electrodynamics.
5, Professor Popov Str., 197376, St. Petersburg.
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Review
For citations:
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;(4):13-23. (In Russ.) https://doi.org/10.32603/1993-8985-2018-21-4-13-23