IET International Radar Conference 2015
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- Location: Hangzhou, China
- Conference date: 14-16 Oct. 2015
- ISBN: 978-1-78561-038-7
- Conference number: CP677
- The following topics are dealt with: radar systems; advanced RF technologies; antenna technologies; antenna arrays; radar signal processing; data processing; SAR; ISAR; target characteristics; environment characteristics; emerging technologies; airborne radar; spaceborne radar; marine radar; radar equipment; MIMO radar; geophysical radar; remote sensing; optical radar; terahertz systems; radar imaging; propagation effects; RCS; clutter.
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An Iterative Resource Allocation Algorithm Based on QoE in Perturbed Triangular Lattice
- Author(s): Qiang Gao ; Yifan Liu ; Jianan Liu ; Fei Wang ; Zesong Fei
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The distribution of base stations has a great impact on interference distributions, while most of works about resource allocation are based on ideal assumptions. Base stations (BSs) are placed ideally and interference is ignored, which is far from the real scenario. In this paper, a structure of perturbed triangular lattice which is closer to the deployment of real base stations is proposed. Compared with the regular hexagonal lattice and square lattice model, the perturbed triangular lattice takes the randomness of base stations into account and therefore makes the simulation result more convincing. What's more, an iterative resource allocation algorithm for multi-applications is proposed to maximize QoE (Quality of Experience, a subjective way to measure different types of service accurately) of the whole system. We can formulate the transmission rate into a mean opinion score (MOS) function to accurately obtain the user perceived quality of any types of service. Due to the logarithmic character of MOS function, the proposed algorithm can automatically guarantee the fairness of each user. And the simulation results demonstrate that the iteration convergence speed and stability is satisfactory.
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Design of C/Ka dual-band wideband and wide-angle scanning multifunction phased array
- Author(s): Bin Tang ; Shenghong Wu ; Wenxian Yu
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The multifunction phased array is at present the best choice for the new generation air-to-air missile guidance system. The use of a phased array allows to have the benefits of the electronic scanning. In this paper, a novel dual-band phased array in the C/Ka-bands with wideband and wide-angle scanning capability is designed in the radar seeker application. A new tapered slot antenna (TSA) is used for the array design. The novel antenna is optimized by wizardly grooves and notches on the patch for wideband and wide-angle radiation. Simulation results show that the Voltage Standing Wave Ratio (VSWR) of the antennas are below 1.6 at the two frequency bands, and wide-angle scanning up to a maximum of 60° can be achieved in this dual-band phased array.
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An ultra-wide band exponential flared tem horn antenna for impulse radar systems
- Author(s): Lizhong Song and Yuming Nie
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An ultra-broad band transverse electromagnetic(TEM) exponential horn antenna is designed. A balun is used for the impedance taper along the length of the proposed antenna to improve the antennas impedance characteristic and adapting an unbalanced plane line to a balanced one. The antenna is fabricated and tested. Broadband attributes are demonstrated with measured return loss of better than -10 dB from 8 to 20 GHZ.
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Open ended dielectric filled slot blade antenna design with coaxial feed for airborne applications
- Author(s): T. Rahim ; A. Wahab ; Jiadong Xu
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An open ended slot with narrow rectangular shape filled with dielectric material act as an Omni-directional antenna is proposed. To achieve good impedance matching within the desired band of interest, the slot is excited by 50Ω coaxial cable. The proposed antenna has design at S-band. Nowadays, most communication systems require antennas with features like compact size, aerodynamically suitable and light weight. A simple coupled slot blade antenna is design for airborne applications. The simulated and measured reflection characteristics of the antenna along with the radiation patterns and gain are presented and discussed. Moreover, the ability of the antenna to withstand sturdy conditions and to avoid the light striking by blocking the DC current is also discussed and finally the conclusion is drawn accordingly.
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Millimetre Wave Circularly Polarized Holographic Antenna Based on Artificial Impedance Surface
- Author(s): Li Jiang ; Yang Chun ; Chen Qi ; Li Bo
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Two novelty methods to design circularly polarized holographic antenna have been proposed at millimetre wave band. The antennas designed with the optical holographic principle are structured by sources and interference plane. The interference plane is based on quasi-periodically artificial impedance surface. The antennas which radiation circularly polarized wave from linearly feed are demonstrated by two different approaches. In the first one, the modulation of the phase is provided by varying the phase of feeds which composed of four monopole antennas. In the second one, the transformation of phase is from the surface impedance modulation. As an example, two different circularly polarized holographic antennas are presented with simulation results.
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European Space Surveillance Bistatic Breadboard Radar
- Author(s): S. Saillant
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A bistatic radar demonstrator representative of a future ground based radar system in a realistic operational environment has been developed and realized by ONERA, prime in a consortium of European companies with the support of ESA (European Space Agency). The system is actually being tested to demonstrate its real radar capacities for space objects detection and tracking.
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A model-based approach for geometry extraction of buildings from SAR image
- Author(s): Yueting Zhang ; Fangfang Li ; Xiaolan Qiu ; Chibiao Ding
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In this paper, a model-based approach for geometry extraction of the rectangular building is proposed based on the scattering model. According to the principle of SAR and the scattering mechanisms, the scattering model is deduced according to the ray perspective, including single, double and triple scattering. The double-bouncing scattering region is chosen as a fixed reference point in the matching process. This approach deals with the geometry extraction by using the layover, shadow and multi-path scattering information together. Experiments are implemented on ESR SAR data, which tests the validity of the approach proposed.
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A marching-on-in-time solution of time-domain combined field integral equation with a higher order Nyström scheme
- Author(s): Z.H. Fan ; J. Cao ; R.S. Chen ; D.W. Song ; S. Shang ; Z.W. Qiang
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A higher order Nyström scheme for a marching-on-intime (MOT) solution of the time-domain combined field integral equation (TD-CFIE) is developed to analyze the transient electromagnetic (EM) scattering from arbitrarily shaped perfect electrically conducting (PEC) closed objects. The curvilinear triangular patches are utilized to discretize the PEC objects. Moreover, the Lagrange interpolation polynomials and triangle functions are used to stand for the spatial and temporal basis functions, respectively. Furthermore, the spatial and temporal pointmatching are applied. Numerical examples are shown to validate that the proposed scheme is stable and accurate.
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Analysis of transient scattering from a conductor coated by multilayer thin materials using time domain integral equation
- Author(s): Z.H. Fan ; W.Q. Zhu ; G.S. Cheng ; R.S. Chen ; W.F. Sun ; D. Li
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This paper concentrates on an efficient marching-on-in-time (MOT)-based time domain integral equation (TDIE) method for the analysis of the transient electromagnetic scattering from perfect electrically conducting (PEC) coated by multilayer thin materials. Like its frequency domain counterpart, the proposed method can reduce the number of unknowns significantly while reasonable accuracy can be achieved. Numerical example is presented to demonstrate the accuracy and efficiency of the proposed method.
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Time domain integral equation for analysis of scattering from composite conducting-dispersive dielectric objects
- Author(s): Y.L. Hu ; D.Z. Ding ; Y.Z. Sun ; D.W. Song ; S. Shang ; R.S. Chen
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A marching-on-in-time (MOT) based volume surface integral equation (VSIE) is proposed to analyse the transient electromagnetic scattering from the composite structures comprising perfect electrically conducting (PEC) bodies and inhomogeneous dispersive dielectric materials. Numerical results are given to demonstrate the accuracy of the proposed algorithm.
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A novel two-branch predistortion linearizer of Ku-band TWTA in communication applications
- Author(s): Liu Jie ; Zhang Hua-Dong ; Li Zeng-liang
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This paper presents a diode-based two-branch predistortion circuit. The predistortion circuit contains two nonlinear branches, including the main branch and the auxiliary branch. The main branch is a diode based nonlinear generator. The auxiliary branch consists of variable attenuator and nonlinear generator. By adjusting the voltage bias of nonlinear generator and variable attenuator, different combinations of amplitude and phase characteristics can be obtained. Compared with single nonlinear generator, this two-branch predistortion circuit increases the slope of amplitude characteristic.
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CS-CORR range super-resolution method for stepped frequency HF radar system
- Author(s): Qiushi Chen ; Qiang Yang ; Weibo Deng
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In HF (high frequency) radar, the discontinuous spectrum is a key obstacle for the range resolution enhancement because of the bandwidth limitation. For increasing the signal effective bandwidth as much as possible, the sparse stepped frequency signal is emerged. However, the conventional correlation processing method for this signal will produce high sidelobe, this paper proposes CS-CORR method and deduced the resolution function. The main idea of this new method is to joint existing compressive sensing (CS) and correlation function (CORR) method. This method can reconstruct the sparse frequency and obtain the estimation of non-sparse frequency structure; also it can reduce the sidelobe interference brought by conventional methods, and further realize the effect of super-resolution.
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High order noncircularity restoral diagonal loading robust adaptive beamforming: HNRDL
- Author(s): Yougen Xu ; Bingjie Yin ; Jingyan Ma ; Zhiwen Liu
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A robust adaptive beamformer utilizing noncircularity restoral of the signal-of-interest (SOI) is proposed. In contrast to the existing second-order noncircularity restoral schemes, this new robust beamformer, called HNRDL, is applicable to the case of higher than second-order noncircular SOI, such as QPSK signal and QAM signal. Unlike the popular uncertainty-set schemes, the diagonal loading level in HNRDL can be determined adaptively which involves no user-parameters. Simulation results are included to illustrate the robust filtering performance of the proposed HNRDL beamformer.
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Research on the extraction method for wideband radar target polarization features
- Author(s): Qing-Yu Dong ; Zhang-Feng Li ; Guo-Qiang Zhao ; Yi Zhang
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A method for extracting polarization features of the wideband radar target is studied for radar polarization detection of ground targets. Based on the full polarization data and HRRP, the polarization features of the target are extracted by an integrated approach including polarization detection, polarization decomposition and amplitude weighted. We use this method to process the full polarization data of an armored vehicle. The impact of four weighted methods on extracting target features is compared at first. The results show that linear weighted has better performance. The final results of the polarization features show that sphere scattering is the main scattering mechanism on the front and rear of the armored vehicle, while the dihedral scattering is the main scattering mechanism on both sides of the armored vehicle. And the sphere scattering on the rear part is more than on the front part. The experimental data processing results show that the polarization scattering features can be extracted by this method. And the different structure can be distinguished according the polarization scattering features.
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The Method of Multi-Channel Phased Array Radar Squint SAR System Design
- Author(s): Lei Cui ; Jing Gao ; Zixiao Wang ; Di Yao
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Multi-channel phased array radar has the following advantages: detection multiple target, far work distance, anti-interference capability, and sensitive response, etc. The squint SAR (Synthetic Aperture Radar) is an effective means of detection in complex background in all-weather and all-day. Multi-channel phased array radar needs the consistency of amplitude and phase. The design of the system parameter should focus on the problem of spatial variability properties of PRF and resolution design. This paper introduces the composition analysis of multi-channel phased array radar, consistency of amplitude and phase, and the design of radar system parameters. The result of flight experimentation verifies the method of system design.
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Spatial-temporal heterogeneity of land subsidence evolution in Beijing based on InSAR and cluster analysis
- Author(s): Yingchen Li and Yinghai Ke
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In Beijing, there has been serious land subsidence due to overexploitation of ground water in recent years. It's becoming crucial to evaluate the spatial and temporal heterogeneity for hazard control. In this study, we derived spatial-temporal evolution of land subsidence in Beijing plain area using 48 scenes of ENVISAT-ASAR data by Permanent Scatterer (PS) InSAR techniques. The monitoring results agreed well with leveling measurements. To better understand the uneven characteristics of settlement, Self Organizing Mapping (SOM) was then used to classify the PS points based on the time-series deformation. Six categories were produced and represented different patterns of time-series settlements.
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An improved tracking algorithm of maneuvering targets based on CSHGMM
- Author(s): Shi Wanwan ; Peng Dongliang ; Gu Yu ; Ren Gang
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This paper considers the decline problem of tracking accuracy caused by acceleration estimation inaccuracy in hybrid grid multiple model (HGMM) algorithm. A new improved tracking algorithm of maneuvering targets based on CSHGMM is proposed. Grid partition is performed by estimation of the acceleration mean in current statistic (CS) model, where a fading factor is adopted to improve tracking accuracy by adjusting the gain matrix under the condition of the abrupt change of acceleration. Then possible model sets of the target are generated online, and interactive multiple model algorithm is adopted to estimate the target state. The proposed algorithm performance is tested and compared in general and strong maneuvering scenarios, and simulation results demonstrate that the proposed algorithm not only improves the accuracy for maneuvering target tracking, but also can be applied to most of the tracking scenarios.
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A new location method based on spaceborne radar detecting
- Author(s): Chen Juan ; Wang Shao-Bo ; Han Lang ; Zheng Ze-Xing
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A new location method is proposed in this paper. The location method is based on the spaceborne radar detecting system. Three pulse radars on satellites locate the position by measuring the time delay difference of the direct-path-wave and the target echo. The new location method and the location function derivation are proposed, and the location precision is analyzed and simulated in this paper.
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Estimation in small CPI for radar clutter identification
- Author(s): Liang Yan ; Jia Xu ; Wen-Long Zhou
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The identification of clutter is an important method to mitigate its influences on radar target detection and Doppler centroid provide an effective feature to identify the moving or static clutter. However, Doppler estimation accuracies closely related to the length of the coherent processing intervals(CPI), and the Doppler centroid estimation in a small CPI is challenging . In this study we analyzed the performance of two effective time-domain algorithms, i.e., the correlation Doppler estimator (CDE) and the clutter phase alignment (CPA) in different length of CPI. It is shown that the CPA has higher identification probability and robustness especially for small CPI.
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High-accuracy radar calibration based on ADS-B
- Author(s): Zhang Tao and Tang Xiaoming
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A novel radar error calibration method is proposed to easier calibrate the high-accuracy radar, which is based on the dynamic correction of the ADS-B fixed error and the change of the target echo center. Firstly, the source, types and the characteristics under radar coordinate system of ADS-B position data error are analyzed. Secondly, a model of the change of aviation target echo center is established and analyzed. Finally, on the basis, the radar systematic errors are estimated through a dynamic joint correction is done to the difference of radar data and ADS-B data. This method can improve the precision and stability of the estimation of radar systematic error. Multiple batches measured data is used to test and verify the novel method, and also used to compare performance with other methods. The result indicated that this method effectively improved the precision and stability of the radar systematic error calibration, and the method is succeeded applying in radar calibration equipment.
