A.S. Petrov

JSC «NPO Lavochkina»(Moscow region, Russia)

Dozens of monographs, large review papers, and thousands of journal publications, as well as reports at seminars and conferences, have been devoted to analyzing the characteristics of aerospace-based remote sensing systems operating in various remote sensing modes.

Despite the abundance of technical information in this area, the development of new reliable methods for the integrated assessment of the SAR equipment characteristics with the mutual linking of many parameters describing it, continues to be an urgent task. The problem is that, as a rule, in each publication, only some of the problem parameters identified by the authors are analyzed in detail, and a number of others are left out of the bracket. The equipment common physical configuration is determined by their mutually coupled set.

In this article, a methodology for evaluating the basic parameters of the SAR is developed that is focused on the use of personal computers. The results of its application are illustrated by graphical dependencies.

The first section briefly describes the method for calculating the kinematic parameters of the locator, Doppler signal parameters, geometric resolution, radiometric sensitivity, and resolution. The peculiarity of the obtained relations is that they are given in a generalized form, which allows evaluating the specified parameters of the locator in all its main operating modes. A method has also been developed for selecting such a period of transmitter pulses repetition, in which they are not superimposed on the pulses of the gates that open the input of the receiving device. Restrictions on the minimum and maximum permissible values of the pulse duty cycle of the transmitter are obtained. The information flow and the volume of the radio hologram are calculated. The second section shows the sequence in which the calculations are performed. 

Finally, the third section presents the results of modeling the parameters dependence of the locator operating in the detailed mode on the swath center angle of sight. Among them: noise equivalent of the specific effective scattering area; radiometric resolution; geometric resolution; the ratio of signal power to multiple sections of the power in the main lobe of the antenna pattern; the pulse repetition frequency of the transmitter; the sampling frequency of the signal to the ADC; the size of the swath of the earth's surface; the repetition period and the duration of the pulses of the transmitter; the number of pulses of the transmitter emitted during the passage of the signal to the center of the swath and impulses integrated during the synthesis of the aperture; information flow; the volume of radio hologram; the aperture synthesis time.

Petrov A.S. Low orbit space born synthetic aperture radars set of parameters estimation. Achievements of modern radioelectronics. 2021. V. 75. № 5. P. 46–59. DOI: https://doi.org/10.18127/j20700784-202105-04 [in Russian]

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3. Bistatic radar: emerging technology. Part 4. Spaceborne Interferometric and Multistatic SAR Systems. New York: Wiley. 2008.
4. Krieger G. Advanced Bistatic and Multistatic SAR Concepts and Applications. Microwaves and Radar Institute, DLR. URL: https://elib.dlr.de/43805/1/eusar06_tutorial_advanced_bistatic_sar_final_reduced.pdf.
5. Petrov A.S., Prilutskiy A.A., Volchenkov A.S. Analiz zavisimosti parametrov kosmicheskogo radiolokatora s sintezirovannoy aperturoy ot rezhima ego raboty. Vestnik NPO im. S.A. Lavochkina. 2018. № 1. S. 55–63. [in Russian]
6. Petrov A.S., Prilutskiy A.A., Volchenkov A.S. Metodika rascheta zavisimosti bazovykh parametrov kosmicheskikh radiolokatorov s sintezirovannoy aperturoy ot vysoty poleta i nakloneniya ploskosti orbity nositelya. Vestnik NPO im. S.A. Lavochkina. 2018. № 4. S. 80–87. [in Russian]
7. Petrov A.S., Prilutskiy A.A., Chikov V.A., Volchenkov A.S. K voprosu rascheta geometricheskogo razresheniya i energeticheskogo potentsiala kosmicheskogo radiolokatora s sintezirovannoy aperturoy, raspolozhennogo na geosinkhronnoy orbite i rabotayushchego v bistaticheskom rezhime. Vestnik NPO im. S.A. Lavochkina. 2019. № 4. C. 56–66. [in Russian]
8. Petrov A.S., Volchenkov A.S. Geometricheskoe razreshenie RSA, rabotayushchikh v bistaticheskom rezhime s aktivnym orbital'nym modulem. Vestnik NPO im. S.A. Lavochkina. 2020. № 2. C. 72–81. [in Russian]
9. Petrov A.S. Modelirovanie doplerovskikh parametrov kosmicheskikh radiolokatorov s sintezirovannoy aperturoy. Uspekhi sovremennoy radioelektroniki. 2020. T. 74. № 7. C. 18–31. [in Russian]
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12. Ka M.-H., Kononov A.A. Effect of Look Angle on the Accuracy Performance of Fixed-Baseline Interferometric SAR. IEEE Geoscience And Remote Sensing Letters. 2007. V. 4. № 1. P. 65–69.
13. Low orbit space born synthetic aperture radars set of parameters estimation (46–59 p.)
14. Bulygin M.L., Vnotchenko S.L. Postroenie diagramm slepykh dal'nostey i nadirnykh otrazheniy radiolokatora s sintezirovannoy aperturoy v MATLAB. Trudy MAI. V. № 83. URL: www.mai.ru/science/trudy. [in Russian]
15. Petrov A.S., Prilutskiy A.A., Volchenkov A.S. Uglomestnaya i azimutal'naya neodnoznachnosti signala, prinimaemogo apparaturoy kosmicheskogo radiolokatora s sintezirovannoy aperturoy. Vestnik NPO im. S.A. Lavochkina. 2019. № 1. S. 39–47. [in Russian]
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