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Wuhan, China

Chen Y.,The Academy of Management | Li Z.-H.,The Academy of Management | Tan X.-S.,Early Warning Academy | Zhu G.,The Academy of Management
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2014

The validity and rationality of the Architecture can be validated by imitating and executing on Executable Architecture. In this paper to address in the issue of Executable Architecture design and validation, the method and steps of the Executable Architecture design and validation was elicited that based on combining the character of the DoDAF v2.0 Architecture model with the Object-oriented Method Architecture design method, designing the DoDAF v2.0 Executable Architecture with the xUML and ASL. The feasibility of the method was validated by the process of the anti-TBM Architecture designing. At last, the method with the other method compare. Source

Ji K.,National University of Defense Technology | Wu Y.,Early Warning Academy
Remote Sensing | Year: 2015

Dual polarization is a typical operational mode of polarimetric synthetic aperture radar (SAR). However, few studies have considered the scattering mechanism extraction of dual-polarization SARs. A modified Cloude-Pottier decomposition is proposed to investigate the performance of the scattering mechanism extraction of dual-polarization SARs. It is theoretically demonstrated that only HH-VV SAR can discriminate the three canonical scattering mechanisms from an isotropic surface, horizontal dipole, and isotropic dihedral. Various experiments are conducted using 21 scenes from real datasets acquired by AIRSAR, Convair-580 SAR, EMISAR, E-SAR, Pi-SAR, and RADARSAT-2. Division of the dual-polarization H-α plane is experimentally obtained. The lack of cross-polarization induces the diffusion of scattering mechanisms and their overlap in the HH-VV H-α plane. However, the performance of HH-VV SAR for extracting scattering mechanisms is acceptable. Thus, HH-VV SAR is a suitable alternative to full-polarization SAR in certain cases. Meanwhile, the extraction performance of the other two dual-polarization SARs is badly degraded due to the lack of co-polarization. Therefore, HH-HV and HV-VV SARs cannot effectively extract the scattering mechanisms in the H-α plane. © 2015 by the authors. Source

Zhou B.,Early Warning Academy | Dai L.,Early Warning Academy | Li R.,Early Warning Academy | Li H.,Institute of North Electronic Equipment
IET Conference Publications | Year: 2013

The conventional adaptive beamforming will lead to a severe distortion of monopulse ratio curve in the presence of mainlobe jamming(MLJ), which results in a failure of angle estimation and tacking of a target. This paper presents an constrained adaptive sum-difference monopulse algorithm based on penalty function. This adaptive algorithm can not only suppress the MLJ while maintaining monopulse ratio undistorted, but also lower the sidelobe levels of adaptive pattern. Especially, the sidelobe of difference beam can be suppressed very well. Source

Chen G.,Early Warning Academy | Chen G.,Science and Technology on Electronic Information Control Laboratory | Xie W.C.,Early Warning Academy | Xie W.C.,Science and Technology on Electronic Information Control Laboratory | Wang Y.L.,Early Warning Academy
Advanced Materials Research | Year: 2014

The principle and cost analysis of Constraint-Based Space-Time Adaptive Monopulse (C-STAM) are given. Based on the idea of cognitive radar, a novel Knowledge-Aided Constraint-Based Space-Time Adaptive Monopulse (KA-C-STAM) is proposed. With the knowledge given by a tracking filter in data processing, the KA-C-STAM improves the performance of angle estimation. Numerical examples verify the validity of the novel method. © (2014) Trans Tech Publications, Switzerland. Source

Chen G.,Early Warning Academy | Chen G.,Science and Technology on Electronic Information Control Laboratory | Xie W.-C.,Early Warning Academy | Xie W.-C.,Science and Technology on Electronic Information Control Laboratory | Wang Y.-L.,Early Warning Academy
Tien Tzu Hsueh Pao/Acta Electronica Sinica | Year: 2015

Because a monopulse ratio is distorted and a Doppler mismatch may occur, the performance of the existing space-time adaptive monopulse angle estimation is degraded severely. This paper gives mathematical analysis of the failure mechanism of the conventional space-time adaptive monopulse method. In view of the space-time coupling characteristic of airborne radar clutter, this paper expands a constraint for difference beam to a space-time domain. A novel space-time adaptive monopulse angle estimation approach based on the space-time joint constraint is proposed, and a monopulse curve is extended to a monopulse surface. The accuracy and robustness of angle estimation are improved by the space-time joint constraint. Simulation results verify the validity of the novel method. ©, 2015, Chinese Institute of Electronics. All right reserved. Source

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