Efficient generation of jamming signal is an important but intractable issue in active deception against synthetic aperture radar. Considerations must be given to both the computational complexity and focus depth false scatterers a template. However, existing methods cannot meet demands mentioned above when generating extended scene or scattered targets. In this study, frequency‐domain three‐stage algorithm (FDTSA) proposed. theory, jammer system deliberately reformatted two‐dimensional...

Nonlinear iterative inversion methods are computationally expensive, which leads to limited applications. In this article, a fast algorithm of the cross-correlated contrast source (CC-CSI) method is proposed. By assuming homogeneous background medium, task solving systems linear equations, most time-consuming part CC-CSI method, has been efficiently implemented with several Fourier transforms (FFTs) and inverse FFTs (IFFTs) for transverse magnetic (TM), electric (TE), 3-D inversion,...

Synthetic Aperture Radar (SAR) is a high-resolution imaging sensor commonly mounted on platforms such as airplanes and satellites for widespread use. In complex electromagnetic environments, radio frequency interference (RFI) severely degrades the quality of SAR images due to its widely varying bandwidth numerous unknown emission sources. Although traditional deep learning-based methods have achieved remarkable results by directly processing visual ones, there still considerable room...

At present, the majority of deep learning-based ship object detection algorithms concentrate predominantly on enhancing recognition accuracy, often overlooking complexity algorithm. These complex demand significant computational resources, making them unsuitable for deployment resource-constrained edge devices, such as airborne and spaceborne platforms, thereby limiting their practicality. With purpose alleviating this problem, a lightweight high-accuracy synthetic aperture radar (SAR) image...

The growing interest in 3-D reconstruction of targets, particularly man-made objects, has made synthetic aperture radar (SAR) tomography a hot topic recent years. It obtains reflectivity map by coherently processing multiple images acquired from slightly different views. This paper investigates the use polarimetric tomographic SAR to reconstruct objects and proposes technique, based on multiple-measurement vector compressive sensing (CS) (MMV-CS) model Tikhonov regularization theory. main...

For the special azimuth multichannel reconstruction processing of high-resolution wide-swath single-input multiple-output synthetic aperture radar (HRWS-SIMO-SAR) to resolve Doppler ambiguities, this letter studies imaging characteristics conventional SAR Doppler-modulation jamming (DMJAM) in HRWS-SIMO-SAR provide theoretical basis for development anti-jamming technology. The analysis points out that DMJAM signal will generate equally spaced false targets along direction after imaging, and...

This paper focuses on the interferometry phase of an active coherent jamming in InSAR (Interferometry Synthetic Aperture Radar) images.Based signal models jammer, jamming's imaging results are derived by employing Omega-K algorithm.By comparing InSAR's two channels, phases for both working modes, single-pass and repeat-pass proved to be constants.And values determined jammer's geometry position relative baseline, but independent waveform modulation its background terrain.

In synthetic aperture radar (SAR) images, scattering centers (SCs) from the same geometric structure of man-made target usually have type and similar coordinates. Inspired by this observation, a novel clustering-based geometrical retrieval (C-GSR) method is proposed to estimate targets clustering SCs according their types The C-GSR considers each peak in SAR image as single SC extracts both frequency polarization features for classification. Then, are efficiently clustered using...

After being modulated by a periodic signal, the pulse compression result of LFM (Linear Frequency Modulation) may have many isolated and sharp peaks. According to this phenomenon, we developed strip-map SAR (Synthetic Aperture Radar) jammer which both SAR's fast slow time LFMs with waveforms. This kind jamming can forge bright points in image, confuse image processing. The structure is simple easy be designed comparing that traditional utilizing coherent jamming. Also it only needs much...

Although a Coherent Transponder (CT) is widely utilized in the field of Synthetic Aperture Radar (SAR), its Digital Elevation Model (DEM) has not yet been well studied for Interferometry SAR (InSAR).Based on fact that interferometry phase constant CT with single transmit antenna, this paper mainly focuses InSAR DEM induced by CT.The decorrelation effect intersection region and natural terrain researched detail to support analysis CT's phase-unwrapping.The most important property, which makes...

Single‐pass interferometric synthetic aperture radar (InSAR) has strong anti‐jamming capacity, and can eliminate the arbitrary jamming generated by single stationary transponder via dual‐channel cancellation. In this study, a novel three‐dimensional (3D) deceptive scene generation method against single‐pass InSAR based on two coherent transponders is proposed. The signal of proposed at location composed complex components transponders. scattering coefficient template modulated in each...

Existing false moving target generation methods face challenges such as uncontrollable position and velocity when against multichannel synthetic aperture radar ground indication (SAR-GMTI) system, well significant computational burden in generating dense targets. Meanwhile, current blocking image struggle to create images with controllable coverage shape, the generated will be partially cancelled SAR-GMTI. To tackle these issues, we propose a smart multi-transmitter cooperative method...

A sparse planar array often suffers from the strong grating-lobes that deteriorate inversion performance due to spatial undersampling. In paper, a diffraction tomography (DT) algorithm is proposed solve three-dimensional (3-D) electromagnetic inverse scattering problems with and polarization diversity. The method deals multifrequency multipolarization data as follows: firstly, doing fusion; next, using exact coordinate transformation; then decoupling modifying aliased spectrum of...

In this article, a fast method for generating false large scenes against SAR based on the cooperative multi-transmitter is proposed. First, we give an improved range frequency-shifting modulation (IRFSM) utilizing template Chirp-Z Transform (CZT) in range, which can help transmitter accomplish jamming quickly. Then, with derivation of formulas azimuthal Doppler domain, convolution and IRFSM (ACIRFSMJ) built two-dimensional CZT (2D-CZT) This ACIRFSMJ decouple directions to reduce difficulties...

Unmanned aerial vehicles (UAV) have become vital targets in civilian and military fields. However, the polarization characteristics are rarely studied. This paper studies property of UAVs via fusion three polarimetric decomposition methods. A novel algorithm is presented to classify recognize automatically which includes a clustering method proposed “Science”, one top journals academia. Firstly, selection imaging ensures quality radar images. Secondly, local geometrical structures can be...

The basic principles of SAR jamming performance evaluation (JPE) are discussed firstly. A novel method by combining the subjective and objective is proposed. Namely, based on parameters, a nominal value can be obtained weighting where weighted factors come from expert's judgments. Detailed derivations given as well simulation experiments.

The growing interest of Radar community in retrieving the 3D reflectivity map makes both polarimetric SAR interferometry and tomography hot topics recent years.It is expected that combining these two techniques would provide much better discriminating ability for scatterers lying same pixel.Generally, this about reconstruction scattering profiles from limited irregular measurements.As an emerging technique, Compressive Sensing (CS) provides a powerful tool to achieve purpose.In paper, we...

Polarimetric synthetic aperture radar (PolSAR) building extraction plays an important role in urban planning, disaster management, etc. In this paper, a method using refined model-based decomposition and robust scattering feature is proposed. On the one hand, newly proposed five-component its derived powers are applied to detect buildings. other by combining matrix elements co-polarization correlation coefficient, discriminate buildings non-buildings. Both these two preliminary results...

Due to incomprehensive and inaccurate scattering modeling, the state-of-the-art polarimetric synthetic aperture radar (PolSAR) model-based target decompositions are incapable of effectively depicting mechanism obliquely oriented urban areas. In this paper, a seven-component decomposition scheme is proposed by constructing several sophisticated models. First, an eigenvalue-based obliquely-oriented dihedral model presented reasonably distribute co-polarization cross-polarization powers in...

Synthetic aperture radar ground moving target indication (SAR-GMTI) has been extensively used in the battle field information acquiring. In this paper, a barrage repeater jamming against SAR-GMTI is proposed. This method separates intercepted signal into several equal segments and reradiates them back to rearranged order. The essence of that separation number order are random between each pulse. randomicity leads SAR images which cannot be cancelled by displace phase-center antenna (DPCA)...

Existing frequency-diverse array (FDA)-based jamming methods against synthetic aperture radar (SAR) still require complex modulation calculations to generate false area targets as the traditional SAR method does, and cannot them solely without regular distribution or repetition in range images. However, such tends make easily identifiable. Therefore, order create flexible both azimuth, this letter first proposes a obtain Doppler-modulation phase using Fast Fourier transform (FFT) of template...

High-resolution range profile (HRRP) has attracted intensive attention from radar community because it is easy to acquire and analyze. However, most of the conventional algorithms require prior information targets, they cannot process a large number samples in real time. In this paper, novel HRRP recognition method proposed classify unlabeled automatically where categories unknown. Firstly, with preprocessing HRRPs, we adopt principal component analysis (PCA) for dimensionality reduction...

Diffraction tomography (DT) is a linear approach to solving electromagnetic inverse scattering problems. Based on the weak assumptions (such as Born or Rytov approximations), spatial spectrum of contrast at one certain frequency mapping scattered field data. As well known, using more frequencies means better performance noise suppression. However, spectra are aliased in cases multi-frequency In addition, permittivity and conductivity coupled spectrum. this paper, quantitative DT for...