Addressing the Terrain Topography in Distributed SAR Imaging

Kraus, Thomas; Krieger, Gerhard; Bachmann, Markus; Moreira, Alberto

doi:10.1109/radar41533.2019.171266

Cited by 8 publications

(4 citation statements)

References 15 publications

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“…Currently, there are already some options for solving this problem. In this study [12], pointed the prospects of implementation of a multi-position satellite system for high-resolution radio imaging. Multipositioning ensures global imaging.…”

Section: Introductionmentioning

confidence: 92%

Practical imaging algorithms in ultra-wideband radar systems using active aperture synthesis and stochastic probing signals

Zhyla¹,

Volosyuk²,

Павликов³

et al. 2023

reks

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The subject of the manuscript is the algorithms for radar imaging. This research develops imaging methods and algorithms for wideband and ultrawideband active aperture synthesis systems with antenna arrays and stochastic probing signals. The use of antenna arrays makes it possible to obtain radar images without the need to move radar or antenna system in space. The use of wideband and ultra-wideband stochastic probing signals is justified by their narrow autocorrelation functions. This increased the resolution of the obtained images. The main idea of the proposed algorithms is to filter the original wideband signal into several narrowband processes. Furthermore, only the central frequencies of each narrowband signal were processed. This approach allows us to use the classical widespread methods of aperture synthesis for the case of a wideband signal. Usually, they are applicable only for narrowband signals that satisfy the condition of a quasi-monochromatic approximation. This significantly reduces the overall computational complexity of the imaging algorithm, which simplifies its further practical implementation on the existing radioelement base. Because of the simulation, a primary radar image has been obtained and the overall performance of the proposed approach to processing wideband signals has been confirmed. An increase in the quality of the obtained image when using a multiple of frequency ranges is shown. An experimental study of the effect of processing a wideband signal only at its centre frequency instead of the entire frequency band is conducted. During the experiment, the correlation functions of the signals received by two spaced receivers were obtained. As a result, the Van Cittert-Zernike theorem has been experimentally confirmed. It allows signal processing only at its centre frequency instead of the entire frequency band. Simultaneously, the prospect of expanding the bandwidth of the probing signal is indicated. It, in the presence of a wideband element base and devices for high-speed signal processing, will further increase the imaging resolution of a radar system.

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Section: Introductionmentioning

confidence: 92%

Practical imaging algorithms in ultra-wideband radar systems using active aperture synthesis and stochastic probing signals

Zhyla¹,

Volosyuk²,

Павликов³

et al. 2023

reks

View full text Add to dashboard Cite

show abstract

“…This assumption can be considered valid for a formation extent but not for constellation of satellites [17]. At least, some phase correction can be added in the focusing, as demonstrated in [22].…”

Section: The Model In the Frequency Domainmentioning

confidence: 99%

“…However, it is very difficult to relate such values to the research of a sub-optimal PRF (there is not a simple closed-form expression relating satellite distance, PRF, and performance). For this reason, we adopted an exhaustive research of the optimal PRF according to the quality of recombination, simply measured through the ratio between the recombination gain, given by Equation (22) and the condition number of H * H:…”

Section: Tuning the Prfmentioning

confidence: 99%

“…If the DEM has lower resolution, then the number of unknown heights would decrease and one could try to estimate them with unmixing but still, as common to all unmixing problems [22,28], any solution would be acceptable unless the higher order moments of the amplitude statistics are used. Furthermore, in the case of full resolution, two degrees of freedom only (the real and imaginary part of the reflectivity) are available for each unknown (the height error) and thus hardly sufficient for any reliable estimate of the height.…”

Section: Across-track Baseline Effectsmentioning

confidence: 99%

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Along-Track Multistatic Synthetic Aperture Radar Formations of Minisatellites

et al. 2020

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The paper analyses an along-track multistatic Synthetic Aperture Radar (SAR) formation. The formation aims at achieving a high azimuth resolution maintaining at the same time a large swath width. The case with one transmitting sensor and all receiving is analyzed (Single Input Multiple Output, SIMO). An effective and novel reconstruction, in the two-dimensional frequency domain is introduced that is able to keep low the azimuth ambiguity and achieve a recombination gain close to the theoretical one. Degradation of the system performance due to the loss of the control of formation position is analyzed using probabilistic considerations. Moreover, some innovative methods to mitigate the loss of optimality are introduced and evaluated using simulations. Finally, considerations on the impact of the across-track non zero baseline are discussed.

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Along Track Slope Compensation In A SIMO Formation

Petrushevsky

Guarnieri

2023

2023 IEEE International Conference on Acoustics, Speech, and Signal Processing Workshops (ICASSPW)

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Addressing the Terrain Topography in Distributed SAR Imaging

Cited by 8 publications

References 15 publications

Practical imaging algorithms in ultra-wideband radar systems using active aperture synthesis and stochastic probing signals

Practical imaging algorithms in ultra-wideband radar systems using active aperture synthesis and stochastic probing signals

Along-Track Multistatic Synthetic Aperture Radar Formations of Minisatellites

Along Track Slope Compensation In A SIMO Formation

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