It is a feasible and promising way to utilize deep neural networks learn extract valuable features from synthetic aperture radar (SAR) images for SAR automatic target recognition (ATR). However, it too difficult effectively train the with limited raw images. In this paper, we propose new approach do ATR, in which multiview learning framework was employed. Based on ATR pattern, first present flexible mean generate adequate data, can guarantee large amount of inputs network training without...

The rotation of structures in a target introduces additional frequency modulations on the returned signals and also generates sidebands about center Doppler target. In other words, body image will be contaminated due to interference from rotating parts. this paper, an imaging method for moving targets with parts is presented. simple implement based Hough transform (HT), which widely used processing. Using standard HT extended HT, we put forward separation by detecting straight lines...

A new method of phase error estimation that utilizes the weighted least-squares (WLS) algorithm is presented for synthetic aperture radar (SAR)/inverse SAR (ISAR) autofocus applications. The does not require signal in each range bin be a certain distribution model, and thus it robust many kinds scene content. most attractive attribute can used to estimate all errors, no matter whether they are low order, high or random. Compared with other methods, WLS optimal sense has minimum variance...

New applications of nonlinear chirp scaling (NLCS) have been found in processing monostatic and bistatic SAR data acquired the strip-map mode. When effects impulse response broadenings due to quadratic range migration are negligible for short radar wavelengths, a time domain cell correction (RCMC) can be applied. After correction, FM rates targets confined gate will differ from each other. A perturbation function applied equalize targets' before azimuth compression. This algorithm is...

A broad bandwidth and high gain rectangular patch antenna was specifically designed in this paper using planar-patterned metamaterial concepts. Based on an ordinary antenna, the has isolated triangle gaps crossed strip-line etched metal ground plane, respectively. Demonstrated to have left-handed characteristics, patterned finite plane form a coupled capacitive-inductive circuit of negative index metamaterial. It is shown great impact performance enhancement terms significantly broadened...

In this communication, a dual-polarized aperture-coupled microstrip patch antenna with broad-bandwidth high-isolation low cross-polarization levels, and low-backward radiation levels is designed its features are presented. For broad bandwidth easy integration active circuits, it uses the stacked patches. The corner feeding of square patches applied coupling aperture H-shaped aperture. theoretical analysis based on finite-difference time-domain (FDTD) method. A designed, fabricated, measured....

A low profile slot antenna array is designed to operate over a wide bandwidth with sidelobe levels. Taylor synthesis used taper the power distribution among aperture. An efficient approach design an equal-phase but unequal-power symmetric waveguide divider proposed for constructing amplitude-tapering feed-network array. Phase differences are balanced by adjusting phase velocities. The basic radiator 2 × subarray, uniformly fed such divider. 16 then constructed 8 of subarrays. 1-to-64 way...

Long time coherent integration (LTCI) technique enhances radar detection of maneuvering weak targets. Unfortunately, range migration (RM) and Doppler frequency (DFM) would occur during the period. Existing LTCI methods are all based on assumption that target is single motion model (i.e., target's fixed) long time. However, with increasing maneuverability observation (needed to detect targets), often changing multiple models) time, which reduce performance existing significantly. In this...

In most interferometric inverse synthetic aperture radar (InISAR) systems, the pixels between two ISAR images derived from corresponding antennas usually do not register properly. As such, correct phase difference could be obtained. A three-dimensional (3-D) motion compensation method, or 3-D focusing, is put forward in this paper. With a multiple antenna pair configuration, angular parameters both azimuth and pitching directions are accurately estimated without usual phase-unwrapping...

A new dual-polarized slot-coupled microstrip patch antenna is presented, which can achieve high-isolation, low cross-polarization levels, a wide bandwidth, and backward radiation levels. The coupling slot an H-shaped slot. For bandwidth easy integration with active circuits, it uses stacked patches. theoretical analysis based on the finite-difference time-domain (FDTD) method. First, parametric study input impedance of single port presented. Based results, designed, fabricated, then...

The direct metal laser sintering (DMLS) technique, using aluminum alloy, is adopted to fabricate a relatively large 8 ×8 wideband multilayer waveguide array with an integrated corporate-fed network in the Ku-band. This DMLS technique offers flexibility structures complicated embedded good reliability and high precision. It favorably compared time-consuming machining when must be built separate pieces secured together. Experimental results show there 1.0 ~ 1.5 dB gain improvement one that...

In this paper, we consider the multi-frame integration (including intra-frame and inter-frame integration) problem for detection of weak moving targets, where range walk effect (RWE) occurs within time. A novel method is proposed to achieve accumulation a target's radar echoes. More specifically, contains two main steps, modified Radon Fourier transform (RFT) firstly used realize coherent every frame echo signals. After that, RFT-domain algorithm presented based on characteristics RFT...

The airborne coherent multi-input multi-output (MIMO) radar benefiting from integration (including intra-channel and inter-channel integration) of multi-channel echoes can obtain superior detection performance for high-speed maneuvering targets. However, due to the coupling motion characteristic between multiple platforms targets, range walk (RW) Doppler (DW) will occur within integration. Besides, signals also exist envelope phase differences, which lead difficulty in We make contributions...

The phase-gradient autofocus (PGA) technique is robust over a wide range of imagery and phase error functions, but the convergence usually requires four-six iterations. It necessarily iterative in an attempt to converge on dominant target against clutter interference, while sufficiently capturing blur function. authors propose speed estimation by selectively increasing pool quality synchronization sources not be limited pixels SAR map. This highly probable since each bin contains more than...

The narrow bandwidth of a microstrip antenna is one the important features that restrict its wide usage. A simple and practical method for design broad-band antennas presented in this paper. Utilizing technique, several two-layer have been proposed. To confirm applicability designs at L-band, experiments carried out. measured results show proposed up to 25.7%. Also, paper applicable other types multilayered planar antennas.

In this paper, a 3D inverse synthetic aperture radar (ISAR) imaging method based on an antenna array configuration is proposed. The performance of conventional interferometric ISAR system using three antennas poor, as the positions scatterers, which have same range-Doppler value and projected onto plane synthesis scatterer, cannot be correctly estimated. However, by two arrays perpendicular to each other, system's ability separate these scatterers can improved. criterion for selection range...

Vector potential formulation and parametric studies of electromagnetic scattering problems a sphere characterized by the rotationally symmetric anisotropy are studied. Both epsilon mu tensors considered herein, four elementary parameters utilized to specify material properties in structure. The field representations can be obtained terms two potentials, both TE (TM) modes (with respect r) inside (outside) derived expressed series fractional-order (in real or complex number) Ricatti-Bessel...

Conventional inverse synthetic aperture radar image is a 2-D range-Doppler projection of target and does not provide 3-D information. Its formation also requires complex motion compensation when the uncooperative maneuvering. On other hand, multiple-input multiple-output (MIMO) radar, in addition to having wide virtual high cross-range resolution, could obtain target's one snapshot thus have avoided needed. In this paper, we propose imaging algorithm using three MIMO configurations. The...

The theory of compressed sensing (CS) states that an unknown sparse signal can be accurately recovered from a limited number measurements by solving sparsity-constrained optimization problem. In this paper, we present new framework high-resolution bistatic inverse synthetic aperture radar (Bi-ISAR) imaging based on CS. A phase-preserved CS approach for high-range resolution is proposed. phase Bi-ISAR extracted constructing Fourier basis, which crucial to azimuth processing imaging. After...

In inverse synthetic aperture radar (ISAR) imaging, a target is usually regarded as consist of few strong (specular) scatterers and the distribution these sparse in imaging volume. this paper, we propose to incorporate signal recovery method 3D multiple-input multiple-output algorithm. Sequential order one negative exponential (SOONE) function, which forms homotopy between ℓ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub>...

In the real application scenario, time information when a moving target enters/leaves radar coverage is often unknown, which would lead to severe performance loss for refocusing, parameter estimation and imaging. We address refocusing motion parameters problem with unknown entry/departure time, involving range cell migration (RCM) Doppler frequency (DFM) within coherent period. A computationally efficient method based on extended generalized Radon Fourier transform (EGRFT) window Fractional...

Multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) technology is widely used in integrated radar and communication systems (IRCSs). Moreover, index modulation (IM) a reliable OFDM transmission scheme the field of communication, which transmits information by arranging several distinguishable constellations. In this paper, we propose sparse reconstruction-based joint signal processing for MIMO-OFDM-IM systems. Combining advantages MIMO OFDM-IM technologies,...