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For the 2D radar system, in order to improve the performance of target plots, a new algorithm based on geometric center and amplitudes of measurements was proposed, aimed at that the traditional plots centroid algorithm does not use the amplitude information or over-uses it. The proposed algorithm can reduce the weights of the measurements which are far away from the geometric centre, so as to obtain...
Caustics problem is inherent to classical high frequency approximation such Geometrical Optics (GO), Geometric Theory of Diffraction (GTD), Uniform Theory of Diffraction (UTD) and Equivalents Current Methods (MCE). All these developments propose numerical estimations of the EM field scattered from reflection, diffraction, and multiple scattering from an object. In this paper we apply the Gaussian...
Automated Target Recognition (ATR) based on Natural Resonance Frequencies (NRFs) embedded in Ultra Wideband (UWB) transient electromagnetic signatures have been extensively studied. To our knowledge, most studies concerning ATR using the E-Pulse technique are about radar targets in free space. Recent attempts have been made to apply the E-Pulse technique for subsurface target detection. In this paper,...
In this paper we present the results of performance analysis of a GOWMAX CFAR detector in non homogenous environment. The study is made for radar targets of Swerling I type embedded in white Gaussian noise. The results are presented in terms of probability of detection and false alarm. Also we expose the algorithm considered and the results obtained for its implementation on DSK 6711 card using a...
Angle glint can is the distortion in the radar echo signal phase front and is observed as deviation of the direction of power flow from the radial direction and give rise to radar pointing errors. The mechanism that gives rise to these errors is also responsible for angular errors observed in radar multipath conditions. The effect can be either natural or intentional and is due to the destructive...
A correspondence is shown between anomalous sightings of ships by a weather radar with an upward tilted beam, and the existence of surface based ducts determined from numerical weather prediction (NWP) models. Since these forecasts are available several days in advance, the existence of such ducts can be predicted in advance. The parameters of these ducts are used in a propagation model to determine...
In this paper, a target reconstruction procedure is proposed for simulating the near-field signatures of a complex target with high fidelity. The target model is composed of trihedral corner reflectors and different radar targets can be represented by combinations of trihedral corner reflectors without manufacture of either full-size or scaled target models. The near-field target is initially reconstructed...
When multiple radar targets are close to each other, the returned signals from these targets are overlapped in time. The translational motion can be viewed as a uniformly accelerated motion, therefore, the Doppler variation of echoes in the cross-range direction can be approximated by the first-order polynomial which is called linear frequency modulation signal. For different targets, the chirp rates...
Improper size of subdivision often wastes a lot of time even leads to wrong conclusion when calculating RCS (radar cross section) of targets at high-frequency. In this paper, we study the law how to choose size of subdivision in high-frequent situation by large numbers of simulation and analyze, and the law used to choose size of subdivision is proposed to calculate more accurate result in short time.
Radar target micro-Doppler signatures reflect the electromagnetic characteristics, geometry structures and motion signatures of the target, which has been shown to be promising signatures for application. In this paper, we review the present research status and some key techniques in this field, including the analysis of micro-Doppler signatures, feature extraction and the applied fields. Several...
Radar signatures of complex targets for different frequencies, aspect angles and target positions are needed in various radar application areas. In addition, specific scattering centers of complex real radar targets have a strong impact on the overall signature of the target. However, measurements are mostly inefficient for providing the required information and for studying the behaviour of such...
This paper concerns the simulation of inverse synthetic aperture radar (ISAR) image for radar targets based on the shooting and bouncing ray (SBR) method. Contrary to the conventional approach where the ISAR image is obtained by inverse Fourier transforming to the scattering field, we adopt a newly-developed method [8], where the Fourier transformation has been merged into the SBR algorithm. Such...
Since Huynen's original work, there have been many other proposed target decomposition theorems. In this paper, we provide a review of the different approaches used for target decomposition theory in radar polarimetry and classify three main types of theorems: those based on Mueller matrix, those using an eigenvector analysis of the coherency matrix, and those employing coherent decomposition of the...
In resonance domain, the radar scattering response of any object can be modelled by natural poles of resonance with the formalism of the singularity expansion method. The mapping of these poles in the complex plane, gives useful information for the discrimination of radar targets, as the general shape, the characteristic dimension and the constitution of the target. In this paper, we propose to study...
In resonance domain, the radar scattering response of any object can be modelled by natural poles of resonance with the formalism of the singularity expansion method. The mapping of these poles in the complex plane gives useful information for the discrimination of a radar target, as its general shape, its characteristic dimension and its constitution. However, the full frequency band corresponding...
In resonance domain, the radar scattering response of any object can be modelled by natural poles of resonance with the formalism of the Singularity Expansion Method. The mapping of these poles in the complex plane, gives useful information for the discrimination of radar targets, as the general shape, the characteristic dimension and the constitution of the target. In this paper, we propose to study...
This paper describes a radar-guided monocular vision system that detects, validates, and tracks the preceding vehicle and thus predicts its lane-change intentions. A vision-based lane tracking process is developed to create a stable motion model in order to map the radar targets to image coordinates and consequently generate the region of interest (ROI) to search for a potential preceding vehicle...
A scattering formulation is described here which can be used to understand and predict the electromagnetic scattering from a target positioned over a (potentially) rough interface. It has application to the evaluation of radar performance in the presence of multipath
Reconstructing three-dimensional scattering centers of radar targets without knowledge of viewing angles or relative radar-target motion is investigated. The performance bounds are deduced in which the parameter constraints and rotatory ambiguities are specially treated. We propose a novel method based on the signal subspace invariance in multiple one-dimensional projection sequences, which greatly...
High radial velocity of radar targets is an important reason of HRRP (high range resolution profile) distortion in synthetic HRR pulse radar and it can be measured by transmitting high PRF sequences. Therefore, high PRF synthetic HRR sequence has the potential to acquire accurate radial velocity besides of accurate range and undistorted HRRP. In this paper, a new waveform called CSF (cross stepped...
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