Sanyuan, China
Sanyuan, China

Time filter

Source Type

A new technique for image fusion based on nonsubsampled shearlet transform (NSST) and improved pulse-coupled neural network (PCNN) is proposed. NSST, as a novel multiscale geometric analysis tool, can be optimally efficient in representing images and capturing the geometric features of multidimensional data. As a result, NSST is introduced into the area of image fusion to complete the decompositions of source images in any scale and any direction. Then the basic PCNN model is improved to be improved PCNN (IPCNN), which is more concise and more effective. IPCNN adopts the contrast of each pixel in images as the linking strength β, and the time matrix T of subimages can be obtained via the synchronous pulse-burst property. By using IPCNN, the fused subimages can be achieved. Finally, the final fused image can be obtained by using inverse NSST. The numerical experiments demonstrate that the new technique presented in this paper is competitive in the field of image fusion in terms of both fusion performance and computational efficiency. © 2013 Society of Photo-Optical Instrumentation Engineers (SPIE).

Zhang W.,Missile Institute | Tong C.-M.,Missile Institute | Tong C.-M.,Nanjing Southeast University | Zhang Q.,Institute of Telecommunication Engineering
Tien Tzu Hsueh Pao/Acta Electronica Sinica | Year: 2011

Aiming at extracting the time-varying micro-Doppler feature of the vibrating target in ground clutter environment, the method of micro-Doppler extraction based on dual-channel ATI technique and Radon transform is presented. The ATI technique is utilized to suppress ground clutter and obtain the interferometric signal of the vibrating target, which is presented as a straight line along the azimuth direction in the range-compressed data domain. The Radon transform is utilized to detect the weak straight line and find out which range cell it locates at. And the mathematical expressions of micro-Doppler with different vibrating directions are derived and discussed in detail. Compared with the single-channel situation, it is no need to compensate for the Doppler shift caused by the radar's translation, and the target vibrating along the azimuth direction could be effectively detected, whose micro-Doppler presents remarkably nonperiodic feature. Simulated results verify the accuracy and availability of the proposed method.

Zhang W.,Missile Institute | Tong C.,Nanjing Southeast University | Zhang Q.,Institute of Telecommunication Engineering | Zhang X.,Xian Communication Institute
2010 2nd IITA International Conference on Geoscience and Remote Sensing, IITA-GRS 2010 | Year: 2010

Aiming at extracting the time-varying micro-Doppler feature of the ground vibrating target within ground clutter environment, the method of micro-Doppler extraction based on dual-channel ATI technique is presented. The ATI technique is utilized to suppress the ground clutter, and preserve the interferometric signal of the vibrating target in the raw data domain, which is presented as a straight line along the azimuth direction. According to this feature, we can find out which range cell the signal locates at, and then by taking the time derivative of its phase, the micro-Doppler modulation can be obtained. Compared to the single-channel situation, there is no need to compensate for the Doppler shift caused by the radar's translation in advance, and we can obtain the micro-Doppler feature induced by the vibration in any direction, which will help to reduce the computation burden and improve the target detectability. Simulated results verify the validity of the proposed method. © 2010 IEEE.

Feng K.-J.,Missile Institute | Feng K.-J.,The 95059 Unit of PLA | Wang C.-Y.,Missile Institute | Duan Y.-L.,Missile Institute | And 2 more authors.
Tien Tzu Hsueh Pao/Acta Electronica Sinica | Year: 2011

As the performance of STAP of airborne bistatic radar is seriously affected by the range ambiguous clutter and the range nonhomogeneous peculiarity of clutter data samples, an orthogonal projection-Doppler warping method was put forward to cancel the range ambiguous clutter and compensate the nonhomogeneity between clutter data samples. Firstly, this method constructed a space and a time orthogonal projection matrix, which based respectively on the space and the time Doppler frequency of the clutter which returned from the nonambiguous range loop, and used these matrixes to form a new clutter data matrix. Secondly, it gave the new clutter data a Doppler warping to reduce the range nonhomogeneous of samples. The simulation indicates that this method greatly improves the performance of STAP under various bistatic geometries.

Li S.,Missile Institute | He J.,Telecommunication Engineering Institute | Feng Y.-Q.,Science Institute | Liu C.-Y.,Missile Institute | And 2 more authors.
Yuhang Xuebao/Journal of Astronautics | Year: 2012

A novel algorithm for ISAR (inverse synthetic aperture radar) jamming based on the micro-Doppler effect is proposed in the paper. A deception jamming method is presented first, in which the radar signals are repeated by the jammer with additional illusive micro-Doppler signatures after frequency-shift and amplitude-modulation. When receiving these jamming signals, the imaging radar will be confused. On the other hand, because of the additional modulation of the micro-Doppler effect to the radar echoes, the illusive micro-Doppler signals transmitted by the jammer can reduce the correlation between the range profiles, distort the initial phases, and form interference stripes along the azimuth direction. Therefore, another "smart" barrage jamming method is presented based on the micro-Doppler effect. The results of both simulated and measured data prove the effectiveness of these methods with relatively low jam-to-signal ratio.

Tian B.,Missile Institute | Li Z.,Missile Institute | Wang C.,Missile Institute
2010 IEEE International Conference on Ultra-Wideband, ICUWB2010 - Proceedings | Year: 2010

Printed planar monopoles are promising ultra wideband (UWB) antenna and can be easily integrated in communication systems by fabrication onto printed circuit boards. These planar monopoles become popular for wireless communication due to their broad bandwidth and appropriate radiation pattern. However because of the dependence of the antenna gain and the antenna aperture, as the frequency increase, the wavelength decreases, the boresight gain decreases and its variation is very large. In this paper, a new UWB elliptical monopole antenna with a printed structure fed by a microstrip line is presented. The antenna is analyzed by using the finite-difference time-domain (FDTD) method and the parameters of the shape of the antenna are determined by utilizing the genetic algorithm (GA). Through a novel ground structure of the substrate, the boresight gain equals to approximately 2.4dB in the frequency band ranges from 3GHz to 9GHz. Details of the proposed antenna design and simulated results are presented and discussed. © 2010 IEEE.

Chen X.,Missile Institute | Liu Q.,Missile Institute | Hu M.,Missile Institute
Proceedings of the 2010 2nd International Conference on Future Computer and Communication, ICFCC 2010 | Year: 2010

Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) has become one of the key technologies for the B3G & 4G broadband wireless communications. As MIMO could increase the capacity of the wireless communication system considerably compared with Single Input Single Output (SISO) and OFDM could obtain good performances in multipath frequency-selective fading channels, we combine them together with the Space-Time Block Coding (STBC) scheme and the Nakagami-m fading model. The Nakagami-m(0.5≤m<∞) fading model, covering a series of channel conditions in different fading parameters, brings greater flexibility and accuracy than normal, logistic and other distributions. From the simulation figures, we can draw the conclusion that the scheme could better performances of the system's bit error rate (BER) and capacity greatly, thus improving the whole system's performances. ©2010 IEEE.

Zhang W.,Missile Institute | Tong C.-M.,Missile Institute | Zhang Q.,Institute of Telecommunication Engineering
Yuhang Xuebao/Journal of Astronautics | Year: 2011

Under the configuration of single-channel, if the radius of the rotating blade is comparatively big, the relationship between the pulse repetition frequency (PRF) and the bandwidth of micro-Doppler will not follow the Shannon sampling theorem, i.e. sub-sampling occurs, which would lead to the phenomenon of micro-Doppler ambiguity. To solve this problem, a method for resolving the micro-Doppler ambiguity for targets with big rotating blades based on the dual-channel ATI technique is presented. The mathematical expressions of micro-Doppler frequency and the bandwidth of micro-Doppler are deduced in detail. The analysis indicates that the bandwidth of micro-Doppler under this configuration is modulated by using a sinusoidal function, which makes it much smaller than that of the single-channel situation, so the Shannon sampling theorem is satisfied and the whole time-frequency distribution without ambiguity can be gained. Finally, the simulation results are given to prove the validity of the presented method.

Chen X.-H.,Missile Institute | Liu S.-W.,Missile Institute | Guan J.,Missile Institute | Liu Q.,Missile Institute
2010 International Conference on Intelligent Computation Technology and Automation, ICICTA 2010 | Year: 2010

QoS multicast routing problem is a nonlinear combination optimization problem, which has been proved to be a NP complete problem. a hybrid algorithm with ant colony optimization algorithm(ACO) and particle awarm optimization algorithm(PSO) is presented. The ACO-GA algorithm absorbs the merits of ACO and GA respectively. In hybrid algorithm, the position update of PSO is used to regulate the solution generated by ACO, which can make the current solution cross with current best solution of the paricle and current best solution of all partiles respectively. In additional, the strategy of the position update in PSO is motified by some re-defined arithmetic operators. The results of test show that the hybrid algorithm can meet QoS contraints of multicast routing problem excellently, and has better performance in finding global best solution. © 2010 IEEE.

Liu L.,Missile Institute | Zhang J.,Missile Institute | Wu Z.,Missile Institute
Chinese Journal of Sensors and Actuators | Year: 2012

Target tracking is an important question in WSN's application study. It is difficult to make aquick and accurate target tracking with low energy consumption under the condition that the sensor notes are random distributed. In order to reduce energy consumption and raise tracking stability, the article puts forward an adjustment algorithm which has an adaptive tracking sampling period based on distributed dynamic cluster and paralleled particle filter algorithm. The emulation result shows that the method meets the need of rapid, accurate and energysaving tracking and possesses practical application value.

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