Converting a 3D surface into a set of directional scatterers for high-resolution radar response simulation

Perälä, Henna; Väilä, Minna; Jylhä, Juha; Venäläinen, Ilkka; Visa, Ari

doi:10.1117/12.893485

Cited by 4 publications

(1 citation statement)

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“…Recently, Perälä et al [ 40 , 41 , 42 , 43 ] proposed a novel RCS prediction method that does not require a priori knowledge of the target’s material properties. In this method, the target’s geometry is extracted from optical images captured using a camera.…”

Section: Discussionmentioning

confidence: 99%

Scaled-Model Radar Cross-Section Measurement: The Influence of the Scattered Field under Gaussian Beam Illumination—A Theoretical Analysis

Ang,

Lui

2023

Sensors

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At microwave frequencies, radar cross-section (RCS) measurements are usually performed by placing the target in the far-field region of the antenna. The wavefront of the radiating field from the antenna can be approximated as planar, ensuring that the incident field and the power interact with the target independently of the antenna. However, for electrically large targets, the required distance becomes significant, posing challenges for implementation. Scaled-model RCS measurements offer an alternative solution. RCS measurements at terahertz and optical frequencies typically require a collimated beam as the source, where the intercepted power and RCS become dependent on the excitation. To address this dependency, researchers have proposed modifying the RCS definition to account for the intercepted power and to analytically formulate the scattering problem. However, such modifications require prior knowledge of the target’s geometry and material properties, which are often not readily available in practice. This also limits the study to only canonical targets. In this paper, we propose an alternative approach for modelling the intercepted power. The Gaussian beam is decomposed into a number of plane waves travelling to different directions using the theory of plane wave spectrum. The scattering problem is solved using the full-wave method of moment. Through theoretical proofs and numerical examples involving spheres and a non-canonical target, with a scaled-model aircraft, we demonstrate that the original RCS definition can serve as a good approximation for scaled measurements, provided that the beam waist is approximately four times the target’s dimensions. These findings provide valuable guidelines for radar engineers when performing scaled measurements using collimated beams. The results, which match those obtained from full-model measurements, enable us to predict the RCS of full-scale targets. This capability facilitates various target-related applications, such as target characterization, classification, detection, and even recognition.

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Section: Discussionmentioning

confidence: 99%

Scaled-Model Radar Cross-Section Measurement: The Influence of the Scattered Field under Gaussian Beam Illumination—A Theoretical Analysis

Ang,

Lui

2023

Sensors

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On efficient characterization of radar targets with scatterer sets for target recognition using commercial ray tracing software

Perälä

Väilä

Jylhä

et al. 2014

2014 IEEE Radar Conference

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ESPRESS—On efficient bistatic characterization of radar targets

Perälä

Väilä

Jylhä

et al. 2015

2015 IEEE Radar Conference (RadarCon)

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Converting a 3D surface into a set of directional scatterers for high-resolution radar response simulation

Cited by 4 publications

References 0 publications

Scaled-Model Radar Cross-Section Measurement: The Influence of the Scattered Field under Gaussian Beam Illumination—A Theoretical Analysis

Scaled-Model Radar Cross-Section Measurement: The Influence of the Scattered Field under Gaussian Beam Illumination—A Theoretical Analysis

On efficient characterization of radar targets with scatterer sets for target recognition using commercial ray tracing software

ESPRESS—On efficient bistatic characterization of radar targets

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Converting a 3D surface into a set of directional scatterers for high-resolution radar response simulation

Cited by 4 publications

References 0 publications

Scaled-Model Radar Cross-Section Measurement: The Influence of the Scattered Field under Gaussian Beam Illumination—A Theoretical Analysis

Scaled-Model Radar Cross-Section Measurement: The Influence of the Scattered Field under Gaussian Beam Illumination—A Theoretical Analysis

On efficient characterization of radar targets with scatterer sets for target recognition using commercial ray tracing software

ESPRESS&#x2014;On efficient bistatic characterization of radar targets

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ESPRESS—On efficient bistatic characterization of radar targets