Reduction of the azimuth ambiguity level in SAR echo signals through processor bandwidth selection

A.G. Lukin; A.S. Petrov; D.A. Yasentsev

doi:10.18127/j03209601-202605-07

Reduction of the azimuth ambiguity level in SAR echo signals through processor bandwidth selection

A.G. Lukin¹, A.S. Petrov², D.A. Yasentsev³

research article UDC 621.396:528.835 Pages: 74-81 doi.org/10.18127/j03209601-202605-07

^1,2 Lavochkin Association (Khimki, Russia)
³ Moscow Aviation Institute (National Research University) (Moscow, Russia)

Keywords: Synthetic aperture radar matched filtering of echo signals Doppler bandwidth processor bandwidth amplitude apodization of antenna aperture illumination

Abstract

Issues related to the effect analysis of multiple azimuth ambiguities on radar imagery have been addressed in both Russian and international monographs, as well as in a number of Russian and international publications. Special algorithms for suppressing this type of interference have also been developed and described. However, before proceeding directly to the application of such algorithms, it is advisable first to limit the level of multiple azimuth ambiguities.

The essence of the method is as follows. Given the known values of the Doppler spectrum bandwidth of the received signal and the pulse repetition frequency of the transmitter, the frequency bandwidth within the main lobe of the antenna radiation pattern, expressed in terms of Doppler frequency, is determined so that the ratio of the azimuth ambiguity to the useful signal does not exceed a certain predefined level. This frequency band is referred to as the processor bandwidth.

Calculation relationships have been derived, and a procedure has been developed for determining the processor bandwidth at which a specified level of the ratio between the azimuth ambiguity signal power and the useful signal power, −20 to −25 dB, has been achieved.

Received: 10.06.2026
Approved after review: 26.06.2026
Accepted: 26.08.2026

How to cite

Лукин А.Г., Петров А.С., Ясенцев Д.А. Снижение уровня азимутальной неоднозначности эхосигнала и процессорная ширина полосы частот радиолокатора с синтезированной апертурой // Антенны. 2026. № 5. С. 74−81. DOI: https://doi.org/10.18127/j03209601-202605-07

References

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Petrov A.S., Yasentsev D.A. Analiz kharakteristik funktsii otklika radiolokatsionnoj stantsii s sintezirovaniem apertury na tochechnuyu tsel' pri vypolnenii okonnoj fil'tratsii ogibayushchej impul'sa s linejnoj chastotnoj modulyatsiej. Trudy VNIIEM. 2025. № 208 (5). S. 72–76. (in Russian)

[1] Verba V.S., Neronskij L.B., Osipov I.G., Turuk V.E. Radiolokatsionnye sistemy zemleobzora. M.: Radiotekhnika. 2010. (in Russian)

[2] Gruzdov V.V., Kolkovskij Yu.V., Krishtopov A.V., Kudrya A.I. Novye tekhnologii zondirovaniya Zemli iz kosmosa. M.: Tekhnosfera. 2018. (in Russian)

[3] Curlander J.C., McDonogh R.N. Synthetic aperture radar. Systems and signal processing. Wiley. 1991.

[4] Cumming I.G., Wong F.H. Digital processing of synthetic aperture radar data. Artech House. 2005.

[5] Kovalenko A.I. Analiz effekta doplerovskoj neodnoznachnosti dlya kosmicheskikh radiolokatorov s sintezirovannoj aperturoj dal'nego nablyudeniya Zemli. Elektromagnitnye volny i radioelektronnye sistemy. 2008. T. 13. № 4. S. 23–33. (in Russian)

[6] Kovalenko A.I. Metod odnomernoj izbiratel'noj reduktsii doplerovskoj neodnoznachnosti dlya radiolokatorov s sintezirovannoj aperturoj detal'nogo nablyudeniya Zemli. Elektromagnitnye volny i radioelektronnye sistemy. 2008. T. 13. № 6. S. 25–33. (in Russian)

[7] Petrov A.S., Prilutskij A.A., Volchenkov A.S. Uglomestnaya i azimutal'naya neodnoznachnosti signala, prinimaemogo apparaturoj kosmicheskogo radiolokatora s sintezirovannoj aperturoj. Vestnik NPO A.S. Lavochkina. 2019. № 1. S. 39–47. (in Russian)

[8] Petrov A.S. Metodika otsenki parametrov nizkoorbital'nykh kosmicheskikh radiolokatorov s sintezirovannoj aperturoj. Uspekhi sovremennoj radioelektroniki. 2021. T. 75. № 5. S. 46–59. (in Russian)

[9] Barbarossa S., Levrini G. An antenna pattern synthesis technique for spaceborne SAR performance optimization. IEEE Transactions on Geoscience and Remote Sensing. 1991. V. 29. № 2. P. 254–259.

[10] Moreira A. Suppressing the azimuth ambiguities in synthetic aperture radar images. IEEE Transactions on Geoscience and Remote Sensing. 1993. V. 31. № 4. P. 885–895.

[11] Guarnieri A.M. Adaptive removal of azimuth ambiguities in SAR images. IEEE Transactions on Geoscience and Remote Sensing. 2005.V. 43. № 3. P. 625–633.

[12] Di Martino G., Iodice A., Riccio D. et al. Filtering of azimuth ambiguity in stripmap synthetic aperture radar images. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing. 2014. V. 7. № 9. P. 3967–3978.

[13] Petrov A.S., Yasentsev D.A. Analiz kharakteristik funktsii otklika radiolokatsionnoj stantsii s sintezirovaniem apertury na tochechnuyu tsel' pri vypolnenii okonnoj fil'tratsii ogibayushchej impul'sa s linejnoj chastotnoj modulyatsiej. Trudy VNIIEM. 2025. № 208 (5). S. 72–76. (in Russian)

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