V.P. Saushkin1, K.V. Tatarenkov2
1,2 JSC “Central radio-research institute named after academician A.I. Berg” (Moscow, Russia)
In article the way of obtaining the radar image (RLI) of the first and the subsequent steps by introduction of artificial migration on inclined range is offered.
Artificial migration is carried out by change of the period of repetition from the impulse to the sounding impulse on the period of time equal to the sample period of the analog-to-digital converter (ATDC) of the alarm processor that traveling range - inclined range" depending on frequency rate of the step leads to different slope angles of holograms in coordinates ".
In this case selection of RLI for the chosen step is carried out by space filtering.
It is known that RLI can be received both on the first, and on the subsequent steps.
For example, when focusing RLI on the purpose of the first step the out-of-focus image of the purpose from the second step is at the same time observed. The relation of amplitude of out-of-focus RLI to amplitude of focused is defined, generally by the steepness of the linearly-frequency modulated (LFM) of the function of support.
Artificial migration on inclined range allows to allocate much more effectively RLI of the chosen step with use of spatial-frequency filters.
The period of frequency change of repetition of impulses of sounding has to be not less interval of synthesis of the aperture.
The radio hologram slope angle in coordinates "traveling range - inclined range" corresponds to the step.
During the work on the second and the subsequent steps the limit for radar carrier speed when maintaining resolution capacity on the traveling range (azimuth) is lifted.
Saushkin V.P., Tatarenkov K.V. Introduction of artificial migration in the radar with the synthesized aperture. Radiotekhnika. 2022. V. 86. № 5. P. 38−42. DOI: https://doi.org/10.18127/j00338486-202205-05 (In Russian)
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