Multistatic Radar Systems

López‐Dekker, Paco; Krieger, Gerhard; Moreira, Alberto

doi:10.1007/978-1-4614-4541-8_2

Cited by 9 publications

(9 citation statements)

References 99 publications

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“…In addition, the separations among the receivers can be changed during the mission to further improve the system capabilities. According to multistatic SAR literature [12], various multistatic configurations can be defined, including: fully-active systems, multi-monostatic, and semi-active systems. In this sense, the above-defined FF-SAR, if realized as a companion satellite mission [13], i.e.…”

Section: Introductionmentioning

confidence: 99%

“…collecting echoes from a pre-existing monostatic SAR, can be also interpreted as a specific case of semi-active multistatic SAR. Safe formation flying operations [3], [14]- [15] and precise clock synchronization [12], [16]- [22] among the receivers are pre-requisites for FF-SAR implementation. Important capabilities in this ambit have already been successfully demonstrated by past bistatic SAR missions, like TanDEM-X mission [4], and more recently, in small satellite formation flying missions, like CanX-4&5 [18].…”

Section: Introductionmentioning

confidence: 99%

“…An FF-SAR can also operate as a multi-baseline single-pass interferometer. Such a configuration has been proposed to implement advanced InSAR techniques [12] like single-pass tomography and Ground Moving Target Indication (GMTI) or to complement the processing architectures of differential SAR interferometry (DInSAR) through repeated multi-baseline Formation Flying SAR: analysis of imaging performance by Array Theory Alfredo Renga, Member IEEE, Maria Daniela Graziano, and Antonio Moccia, Senior Member, IEEE S single-pass acquisitions. In this context, experimental results and methodologies are available [19]- [21].…”

Section: Introductionmentioning

confidence: 99%

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Formation Flying SAR: Analysis of Imaging Performance by Array Theory

Renga

Graziano

Moccia

2021

IEEE Trans. Aerosp. Electron. Syst.

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This paper analyzes the process of image synthesis for a Formation Flying Synthetic Aperture Radar (FF-SAR), which is a multistatic Synthetic Aperture Radar (SAR) based on a cluster of receiving-only satellites flying in a close formation, in the framework of the array theory. Indeed, the imaging properties of different close receivers, when analyzed as isolated items, are very similar and form the so-called common array. Moreover, the relative positions among the receivers implicitly define a physical array, referred to as spatial diversity array. FF-SAR imaging can be verified as a result of the spatial diversity array weighting the common array. Hence, different approaches to beamforming can be applied to the spatial diversity array to provide the FF-SAR with distinctive capabilities, such as coherent resolution enhancement and high-resolution wideswath imaging. Simulation examples are discussed which confirm that array theory is a powerful tool to quickly and easily characterize FF-SAR imaging performance.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Formation Flying SAR: Analysis of Imaging Performance by Array Theory

Renga

Graziano

Moccia

2021

IEEE Trans. Aerosp. Electron. Syst.

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“…A formation-flying synthetic aperture radar (FF-SAR) is a spaceborne distributed synthetic aperture radar [1][2][3] in which the signal emitted by the transmitter and scattered from the area of interest is not collected by a single receiver but by many conveniently distributed formation-flying receivers [4]. FF-SAR is a semiactive multistatic system [5] composed by a single active illuminator and a number of receiving-only passive systems. Bistatic raw data are thus collected by each receiver: these data can be coherently combined to generate either a single, higher performance image [6][7][8][9][10] or to implement single-pass interferometric SAR techniques [5,11].…”

Section: Introductionmentioning

confidence: 99%

“…FF-SAR is a semiactive multistatic system [5] composed by a single active illuminator and a number of receiving-only passive systems. Bistatic raw data are thus collected by each receiver: these data can be coherently combined to generate either a single, higher performance image [6][7][8][9][10] or to implement single-pass interferometric SAR techniques [5,11]. This paper investigates the first topic and specifically analyzes the role played by the along-track separations among the receivers.…”

Section: Introductionmentioning

confidence: 99%

PRF Selection in Formation-Flying SAR: Experimental Verification on Sentinel-1 Monostatic Repeat-Pass Data

et al. 2019

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Formation-flying synthetic aperture radar (FF-SAR) enables new working modes and can achieve very high performance through a series of very compact, low-weight, satellite platforms thanks to passive operations of conveniently distributed formation-flying receivers. System timing is a crucial aspect of FF-SAR. The manuscript presents a novel approach to pulse repetition frequency (PRF) selection in order to obtain a uniform distribution of samples at given platform positions. A digital beamforming algorithm is applied on a stack of monostatic repeat-pass images collected by the Sentinel-1 system to test the validity of the PRF selection method. Processed images were thus properly selected to achieve the best merit index measuring the quality of samples distribution. The results show that: (a) the image resulting from beamforming features better azimuth ambiguity-to-signal ratio and (b) the proposed approach for PRF selection allows one to individuate a subset of the available images leading to uniform distribution of samples which can be used to support FF-SAR processing.

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