Potential Accuracy of Echo-Signal Delay Measurement by Space-Based Radar Altimeter
Abstract
Satellite radar altimetry is a universal tool for global all-weather monitoring of the surface of the Earth. Substantial contribution to the satellite altimeter error is made by a component associated with noise and random nature of the echo-signal itself. When simulating a scattering surface with an array of specular points the altimeter echo-signal represents Gaussian process waveform received against AWGN. In such a case, the conventional statistical design produces an optimal echo-signal delay estimator in the form of the bank of identical energy receivers where decision is made according to maximal response. The Cramer-Rao bound defines the dependence of potential delay estimate accuracy on power and spectral resources used by altimeter, and the form of received power profile. The validity of analytical results obtained is confirmed by MATLAB simulation. It is also shown that the routine method of delay estimate based on threshold crossing yields manifold to the optimal one in measuring accuracy.
About the Authors
D. S. Borovitsky
JSC "Russian Institute of Radionavigation and Time"
Russian Federation
Ph.D. in Engineering (2016), leading research fellow
Russian Federation
Ph.D. in Engineering (2016), leading research fellow
A. E. Zhesterev
JSC "Russian Institute of Radionavigation and Time"
Russian Federation
Ph.D. in Engineering (1982), chief of the department
Russian Federation
Ph.D. in Engineering (1982), chief of the department
V. P. Ipatov
Saint Petersburg Electrotechnical University "LETI"
Russian Federation
D.Sc. in Engineering (1983), Professor (1985) of the Department of Radio Engineering Systems
Russian Federation
D.Sc. in 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. Lavrova O. Yu., Kostianoy A. G., Lebedev S. A., Mitjagina M. I., Ginzburg A. I., Sheremet N. A. Kompleksnysputnikoviy monitoring morey Rossii [Complex Satellite Monitoring of the Russian Seas]. Moscow, ICIRAS, 2011, 480 p. (In Russian)
2. Vignudelli S., Kostianoy A. G., Cipollini P. Coastal Altimetry, ed. by J. Benveniste. Berlin, Springer, 2011, 565 p.
3. Rees W. G. Physical Principles of Remote Sensing. 2nd ed. Cambridge, Cambridge University Press, 2001, 343 p.
4. Martin S. An Introduction to Ocean Remote Sensing. 2nd ed. Cambridge: Cambridge University Press, 2014, 496 p.
5. Terekhov V. A., Grishechkin B. Yu., Baskakov A. I. Potential Accuracy of the Optimal Discriminator for Spaceborne Measuring Roughness of the Sea Surface. Radiotehnicheskie tetradi [Radio Equipment Notebook], 2008, no. 37, pp. 65-69. (In Russian)
6. Egorov B. B., Ka Min-Khoyu. Problems of Aerospace Altimetry Accuracy. Issledovanie Zemli iz kosmosa, 2005, no. 5, pp. 48-55. (In Russian)
7. Kazarinov Yu. M. Radiotehnicheskie sistemy: uchebnik dlja vuzov [Radio Electronic Systems: Textbook for High School]. Moscow, Vysshaya Shkola, 1990, 496 p. (In Russian)
8. Van Trees H. L. Detection, estimation and modulation theory. P. 1. Chichester: John Wiley & Sons, Inc., 2001, 715 p.
9. Brown G. S. The Average Impulse Response of a Rough Surface and Its Applications. IEEE Trans. on Ant. and Prop., 1977, vol. AP-25, no. 1, pp. 67-74.
10. Jackson F. C., Walton W. T., Hines D. E. Sea Surface Mean Square Slope from Ku-Band Backscatter Data. J. of Geophysical Research, 1992, vol. 97, no. 7, pp. 11411-11427.
11. Barrick D. E., Lipa B. J. Analysis and Interpretation of Altimeter Sea Echo. Advances in Geophysics, 1985, vol. 27, pp. 61-100.
Review
For citations:
Borovitsky D.S., Zhesterev A.E., Ipatov V.P., Mamchur R.M. Potential Accuracy of Echo-Signal Delay Measurement by Space-Based Radar Altimeter. Journal of the Russian Universities. Radioelectronics. 2017;(2):5-11. (In Russ.)
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