Improved multilevel physical optics algorithm for fast computation of monostatic radar cross section

An, Yuyuan; Wang, Daoxiang; Chen, Rushan

doi:10.1049/iet-map.2012.0708

Cited by 12 publications

(4 citation statements)

References 19 publications

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“…The low LoF RCS method uses the physical optics method [38,39]. The electromagnetic induction field of the target surface is approximated, and the scattering field is obtained by integration.…”

Section: Low Lof Rcs Calculation Codesmentioning

confidence: 99%

Multifidelity Multidisciplinary Design Optimization of Integral Solid Propellant Ramjet Supersonic Cruise Vehicles

Sun

Yang

et al. 2019

International Journal of Aerospace Engineering

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Integral solid propellant ramjet (ISPR) supersonic cruise vehicles share the characteristic that they are highly integrated configurations. The traditional design of vehicles cannot achieve a balance between computational expense and accuracy. A multifidelity multidisciplinary design optimization (MDO) platform has been developed in this study. The focus of the platform is on ISPR supersonic cruise vehicles. Firstly, codes of discipline with different levels of fidelity (LoF) were established, such as geometry, aerodynamics, radar cross-section calculations, propulsion, mass, and trajectory discipline codes. Secondly, two MDO frameworks were constructed through discipline codes. A low LoF MDO framework is suitable for conceptual design, and a medium LoF MDO framework is suitable for preliminary design. Finally, taking the optimization problem with the minimum overall detection probability of flight trajectory as an example, the low LoF framework first explores the entire design space to achieve the mission requirements, and then, the medium LoF MDO framework accepts the low LoF framework optimization parameters. Hence, the optimization target is reached with more detailed parameters and higher fidelity. Additionally, an example for a solid propellant missile with minimum total mass is tested by the platform. The study results show that the multifidelity MDO framework not only exploits interactions between the disciplines but also improves the accuracy of optimization results and reduces the iteration time.

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Section: Low Lof Rcs Calculation Codesmentioning

confidence: 99%

Multifidelity Multidisciplinary Design Optimization of Integral Solid Propellant Ramjet Supersonic Cruise Vehicles

Sun

Yang

et al. 2019

International Journal of Aerospace Engineering

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“…For canonical geometries, the scattered field can be analytically evaluated [26][27][28][29][30][31] by introducing special functions, especially in the near field and for complex shapes. For complex geometries, numerical techniques have also been developed [32][33][34][35], especially for different excitations [36,37]. For concave object, it is necessary to evaluate the scattered field associated with the double bounce.…”

Section: Introductionmentioning

confidence: 99%

Acceleration of the Primary Basic Functions Calculation from the EFIE-characteristic Basis Function Method (CBFM) Combined with a New Physical Optics Approximation

Bourlier¹

2023

PIER B

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This paper presents a new scheme to implement the iterative physical optics (IPO) approximation with edge diffraction for the scattering from large perfectly-conducting objects, for which, multiple reflections occur. The use of the electric field integral equation (EFIE) discretized by the Galerkin method of moments (MoM) with Rao-Wilton-Glisson basis functions leads to solving a linear system. The characteristic basis function method (CBFM) needs to invert the self-impedance sub-matrices to calculate the primary basis functions (PBFs). To accelerate this stage, these sub-linear systems are directly solved from the physical optics (PO) approximation. In addition, to improve the precision of PO, the EFIE-PO self-impedance matrix is derived analytically. This avoids to apply the magnetic field integral equation (MFIE), for which its principal value is related to PO. Numerical results showed that the resulting algorithm, EFIE-CBFM-PO, predicts inherently the edge diffraction. A domain decomposition method is able to split up the geometry into blocks, for which either the PO or a LU decomposition is applied according to the sub-geometry. To accelerate the coupling steps, the adaptive cross approximation (ACA) is also implemented, and the resulting method is tested on different targets having a curvature and producing multiple reflections. The numerical results show that EFIE-CBFM-PO is more accurate than the conventional EFIE-CBFM-POJ (based on Jakobus et al. work), specially for objects with curvature.

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“…One is the simulation of SAR echo and the other is the processing of SAR echo, namely the SAR imaging algorithm. A robust scattering model is the foundation of the first problem, which has been studied for decades because of its practical importance [6][7][8][9]. For instance, the generalised forwardbackward (FB) method [10], which is presented by Pino et al, combines the conventional FB method [11] and the method of moment [12,13] to calculate the composite scattering from targets located on rough ocean-like surface.…”

Section: Introductionmentioning

confidence: 99%

Highly squinted SAR imaging simulation of ship‐ocean scene based on EM scattering mechanism

Fan

Zhang

2018

IET Microwaves, Antennas & Propagation

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To investigate highly squinted spotlight synthetic aperture radar (SAR) images of an electrically large ship target over a rough sea surface, this work focuses on the simulation analysis of SAR images from such a composite scene. For this problem, there are two key issues need to be considered, namely the simulation and the processing of SAR echoes. Considering the first issue, an efficient facet scattering model based on capillary wave modification facet scattering model and geometrical optics and physical optics hybrid method is applied to calculate the electromagnetic (EM) scattering characteristics from a real ship‐ocean scene, based on which SAR echoes can be obtained. For the second issue, a non‐linear frequency scaling algorithm (NFSA) is employed to efficiently process the highly squinted SAR echoes. Compared with the traditional frequency scaling algorithm, the NFSA extends the frequency scaling operation to the cubic order and makes a more accurate secondary range compression. With the solutions to the two issues, SAR images of a complicated ship‐ocean scene under different incident and squint angles are presented and analysed. The reasonable results demonstrate the validity of the simulation approach and the practicability of the model for highly squinted spotlight SAR images.

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Improved multilevel physical optics algorithm for fast computation of monostatic radar cross section

Cited by 12 publications

References 19 publications

Multifidelity Multidisciplinary Design Optimization of Integral Solid Propellant Ramjet Supersonic Cruise Vehicles

Multifidelity Multidisciplinary Design Optimization of Integral Solid Propellant Ramjet Supersonic Cruise Vehicles

Acceleration of the Primary Basic Functions Calculation from the EFIE-characteristic Basis Function Method (CBFM) Combined with a New Physical Optics Approximation

Highly squinted SAR imaging simulation of ship‐ocean scene based on EM scattering mechanism

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