Interrupted-sampling repeater jamming (ISRJ) provides a novel coherent-jamming mode against wideband radar. ISRJ allows the single-antenna jammer to periodically sample and repeat fraction of intercepted signal, which reduces sampling rate achieves transmit-receive isolation. The signal generated by can form multiple verisimilar false targets when received processed victim radar receiver. Moreover, some precede real target. This paper surveys use in linear frequency modulated (LFM) jamming....

Orientation angle compensation was incorporated into model-based decomposition to cure overestimation of the volume scattering contribution for interpretation polarimetric synthetic aperture radar (PolSAR) data. The is based on rotating coherency matrix minimize cross-polarization term. However, this processing cannot always guarantee that double- and odd-bounce components will be rotated back zero orientation left with power. As a result, built-up patches large angles may still suffer from...

Recent advances in scattering modeling and model-based decomposition theorem were reviewed. The notable achievements include orientation compensation processing, nonnegative eigenvalue constraint, generalized models, complete information utilization, full-parameter inversion strategy, the polarimetric-interferometric scheme. These contribute to make models more adaptive, better fit observations guarantee physically meaningful solutions. key features of these have been summarized. Performance...

A quick response to a large-scale natural disaster such as earthquake and tsunami is vital mitigate further loss. Remote sensing, especially the spaceborne sensors, provides possibility monitor very large scale area in short time with regular revisit circle. Damage ranges damage levels of destructed urban areas are extremely important information for rescue planning after an event. Rapid mapping synthetic aperture radar (SAR) still challenging. Compared single-polarization SAR, fully...

Most polarimetric synthetic aperture radar interferometry (PolInSAR) data processing procedures and their applications are based on the complex coherence descriptor. The reliable estimation of requires selecting sufficient homogeneous pixels for generating an unbiased estimator. In this paper, two indicators using only both interferometric information derived as similarity measures Wishart distributed PolInSAR covariance matrix, respectively. Using these indicators, a double test scheme,...

We focus on the robust joint design of transmit waveform and filtering structure for polarimetric radar. Considering worst case signal-to-interference plus noise ratio (SINR) at output as figure merit to optimize under both a similarity an energy constraint signal, we develop iterative optimization procedure. The effectiveness proposed method is validated through experimental results, underlining performance improvement given by full-polarimetric design.

The overestimation of volume scattering power and the mechanism ambiguity are still present in model-based decompositions even with implementation deorientation processing. These effects demonstrated investigated. One possible reason is because limited dynamic range models themselves that not fully satisfied for mixed scene cases. An empirical model proposed, using repeat-pass polarimetric synthetic aperture radar interferometry (PolInSAR) coherence, to extend be more adaptive. PolInSAR...

Ship detection is one of important applications for synthetic aperture radar (SAR). Speckle effects usually make SAR image understanding difficult and speckle reduction becomes a necessary pre-processing step majority applications. This work examines different methods on ship performances. It found out that the influences filters are significant which can be positive or negative. However, how to select suitable combination detectors lack theoretical basis also data-orientated. To overcome...

Highly variable polarimetric signatures caused by complex structures in built-up areas make interpretation of these scattering behaviors intractable for PolSAR remote sensing. This paper proposes a fine decomposition method and derives several products to finely simulate the mechanisms urban buildings, thus fulfilling its use effective surveillance. First, through theoretically establishing roll-invariant condition completely general scatterer, cross polarization (RICP) model is constructed,...

Accurate detection and identification of destructed urban areas are essentially important for rescue planning after a large-scale natural disaster (e.g., earthquake, tsunami). Spaceborne synthetic aperture radar (SAR) can provide quick response huge area monitoring to mitigate the further loss. Due layover, speckle effect, multiple scattering, etc., accurate mapping damage conditions with SAR is even challenging. Fully polarimetric (PolSAR) has better potential understand from viewpoint...

The realistic false targets caused by interrupted sampling repeater jamming (ISRJ) can mask the real target, leading to failure of radar target detection. In this letter, a method based on jointly designing complementary sequences and receiving filters under signal-to-noise ratio loss constraint is proposed suppress ISRJ. A gradient-based nonlinear programming solver Lagrange multiplier are used optimize alternately. Numerical results show that generate with good correlation properties...

Time-modulated metasurfaces (TMMs) can achieve extraordinary manipulation of electromagnetic (EM) waves and hold remarkable potential in future information fields. However, many limiting factors, including angular stability, polarization insensitivity, conformal ability, remain unconsidered for the TMM. Moreover, it is a significant challenge to independent control orthogonal via TMM while achieving structure. In this article, flexible multifunctional (MTMM) with applications proposed...

High-resolution range profile (HRRP) has been useful in the support of target characterization and thus receives intensive attention. It is still a challenging task to design deception method capable both generating false-target HRRPs concealing real-target HRRP. In this letter, an HRRP based on phase-switched screen (PSS) proposed. This utilizes PSS impose phase modulation onto radar reflected signal so that multiple false targets with verisimilar characteristics appear symmetrically around...

Purpose This paper aims to propose a set of metamodels applicable the architecture modeling air traffic management systems|air system (ATMS) under UAF methodology. The designing also needs meet requirements for introduction new supersonic airliners into ATMS. Design/methodology/approach In order complete and work in case study, GOPPRR method M0–M3 framework are used this paper. design carried out was done multi-architecture tool Airdraw. Findings paper, ATMS methodology proposed, which has...

Echo cancellation is of great potential for a radar cross section reduction in stealth technology. All the techniques developed last decade rely primarily on assumption that echo and target synchronize time domain. However, may lag behind when countering synthetic aperture (SAR). This because generation requires extra processing SAR transmits receives large bandwidth product signal such as linear frequency modulation pulses. Thus, cannot cancel each other perfectly. In this paper, we develop...

Chaff is composed of small and thin pieces glass fibres plated with aluminium or silver dispersed in the air like a cloud from fighters warships. The length chaff fibre generally much smaller than radar resolution its orientation random clouds. Therefore, clouds can be viewed as anisotropic needle-like particles. For such kind target, according to polarimetric decomposition theorem, identifying dominant physical scattering mechanism parameter, which roll-invariant parameter. As result, this...

The phase-switched screen (PSS) imposes phase modulation onto the radar-reflected signal so that its energy is redistributed into sidebands lie outside receiver pass-band. However, when illuminated by a wideband linear frequency (LFM) radar, modulated reflected may still occupy radar pass-band if LFM bandwidth greater than modulating frequency. Previous research about reflectivity performance of PSS against illumination focuses mainly on spectrum characteristics. In this study, an...

The micro-motion properties of the rotational symmetry ballistic targets (BTs) are analyzed in work presented here. A method for estimation precession frequency and angle is proposed based on polarization (BTs). Compared with traditional method, estimated spectra harmonic frequencies considerably smaller. In addition, an inverse synthetic aperture radar (ISAR) imaging technique upon BTs proposed. theoretical conclusions confirmed by application experimental data.

The use of scaled Radon-Wigner transform (RWT) imaging and simultaneous cross-range scaling is proposed for a maneuvering target using signal model rotating with uniform acceleration. Three steps are needed to realize such process. First, the rotational parameters calculated via weighted linear least squares method after obtaining frequency modulation signals in multirange cells. Second, used compensate slow-time signals. Third, inverse synthetic aperture radar RWT implemented scaling....

Sea clutter submerges the small target echo, which is disadvantageous for radar detection. In this letter, we propose to suppress sea by orthogonal projection (OP). We construct subspace directly observed data vectors of neighboring range cells cell under test (CUT), and then CUT projecting signal subspace. design a new detector combines averaging constant false alarm rate (CFAR) with OP. The suppression performance computation complexity OP are compared those singular value decomposition...

This article demonstrates a miniaturized flexible multifunctional active frequency selective surface (MAFSS) with excellent angular stability and polarization insensitivity. The proposed structure consists of two metal layers printed on thin, substrate to achieve curved conformal capability. PIN diodes are welded layers. By independently switching the bias voltage diodes, four working states functions, including electromagnetic (EM) selection, realized. unit cell takes itself as feeder...