Table of Content

30 September 2010, Volume 31 Issue 9

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Paper

Multi-wavelet Fuzzy Neural Network Blind Equalization Algorithm in Underwater Acoustic Channel

LIU Zhen-xing， GUO Ye-cai， GAO Min， ZHAO Xue-qing

2010, 31(9):  1137-1144.  doi:10.3969/j.issn.1000-1093.2010.09.001

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In order to overcome the contradiction between the convergence rate and accuracy

Coordinate Transformation of Long Distance Underwater Vehicles in Visual Simulation

WANG Jin-hua₁, YAN Wei-sheng₂, LIU Xu-lin₂

2010, 31(9):  1145-1150.  doi:10.3969/j.issn.1000-1093.2010.09.002

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With the advent of the long distance underwater vehicles, using terrestrial coor

Attitude Control and Trajectory Simulation in the Process of a Mine out of Water

XIAO Min, SHI Zhong-ke

2010, 31(9):  1151-1156.  doi:10.3969/j.issn.1000-1093.2010.09.003

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An attitude tracking controller was designed to resolve the problems of the mine

An Underwater Target Identification Friend or Foe Method Based on Voiceprint Marker of Ship

WANG Hai-yan, SHEN Xiao-hong, XIANG Jing-lin, JIANG Zhe

2010, 31(9):  1157-1163.  doi:10.3969/j.issn.1000-1093.2010.09.004

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In order to improve the identification friend or foe (IFF) ability of underwater weapon, an underwater target IFF method based on voiceprint marker of ship was proposed. It codes the error correction for appointed secret information and uses fast chaotic frequency hopping (FH) to take the information hiding of first stage. It also selects the working frequency band within the range of main frequency band of ship-radiated noise. The spectrum of FH signal is linear in a short time. The ship-radiated noise can be regarded as the cover-information of FH signal to take the information hiding of second stage, which forms a voiceprint marker of ship. Friend will be identified according to the voiceprint marker of ship. The simulation results show that in the background of strong ship radiated noise and underwater acoustic multipath, the bit error rate of FH signal based on the suggested method is below 10^-6 when SIR = -10 dB and SNR > -4 dB. The reservoir test of 3 km results show that it could attain the correct IFF . Because it is expressed as a covert signal, the enemy can't detect it. The numerical simulation and lake test results show that the IFF method proposed is simple and flexible, and has fast identification speed, high identification rate and the performance of concealment and anti-interception.

Effects of Dragging Navigation Buoyage on Maneuverability of Body-of-revolution UUV

DU Xiao-xu, SONG Bao-wei, PAN Guang

2010, 31(9):  1164-1168.  doi:10.3969/j.issn.1000-1093.2010.09.005

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In order to validate the feasibility of navigation for the body-of-revolution

Error Analysis and Amendment of Three Array-elements Passive Ranging

XU Fu， HUI Jun-ying， YU Yun

2010, 31(9):  1169-1173.  doi:10.3969/j.issn.1000-1093.2010.09.006

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Three array-elements ranging is a conventional technique of passive ranging. Ho

Target's Radial Velocity Estimation Based on the Interference Structure of the Very Low Frequency Acoustic Field

YU Yun₁, HUI Jun-ying₁, CHEN Kai, SANG En-fang₁

2010, 31(9):  1174-1180.  doi:10.3969/j.issn.1000-1093.2010.09.007

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It is advantaged to utilize the resonance line spectrum sound radiation below the frequen

Three-dimension Localization of Broadband Sources Using a Single Vector Hydrophone in Multipath Environment

WU Yan-qun₁, HU Yong-ming₁, NI Ming₁, LUO Hong, MENG Zhou₁

2010, 31(9):  1181-1187.  doi:10.3969/j.issn.1000-1093.2010.09.008

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A novel algorithm of three-dimensional localization based on a single vector hy

Inverse Beamforming Based on Coherent Interference Vector Adaptive Canceling

ZHOU Wei, HUI Jun-ying

2010, 31(9):  1188-1192.  doi:10.3969/j.issn.1000-1093.2010.09.009

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A new method combining adaptive canceling using vector sensor and inverse beamforming (IBF) was proposed to obtain a bearing-time record with high quality. Inverse beamforming can get narrower mainlobe and increase the azimuth resolution of targets. p+v_c was regarded as the reference signal to avoid the detection blinding zone in the endfire direction. At last the new method's performance was verified by sea experiment data processing. The experiment results show that the new method can cancel the self-noise completely, decrease the interference background of target's track and improve p+v_c's ability of resolving port and starboard ambiguity.

Waveform Design of Broadband Doppler Sonar

HUANG Xiong-fei, YUAN Bing-cheng

2010, 31(9):  1193-1199.  doi:10.3969/j.issn.1000-1093.2010.09.010

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Broadband Doppler sonar improves the measuring precision compared to narrowband

The Application of Recursive Algorithm on Ship's Magnetic Field Extrapolation

YAN Hui, XIAO Chang-han, YIN Ke-quan, ZHENG Yong-liang

2010, 31(9):  1200-1203.  doi:10.3969/j.issn.1000-1093.2010.09.011

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A recursive algorithm of three-component magnetic field extrapolation was proposed. It relates the three-component magnetic fields at two points on different horizontal planes with the same horizontal coordinates each other by integral of the vertical partial derivatives. Based on the characteristics of divergence and curl of the magnetic field vector, the vertical partial derivatives of the magnetic field can be related to the horizontal partial derivatives. Then, when the magnetic field's three components on a plane are known, the magnetic field extrapolation can be realized by recurring from far field to near field gradually. The application results show its high efficiency and accuracy.

Numerical Calculation of Flow Noise of Submarine with Full Appendages

ZENG Wen-de， WANG Yong-sheng， YANG Qiong-fang

2010, 31(9):  1204-1208.  doi:10.3969/j.issn.1000-1093.2010.09.012

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A method combined the computational fluid dynamics (CFD) with the boundary element method (BEM) was used to predict the flow noise of submarine with full appendages. The total sound pressure level at typical measured point and acoustic directivity of the submarine were obtained. Firstly, a geometric model was established for the submarine with full appendages and the flow field's computational region discretization was carried out by using structural grid. Then, the steady flow performance of the submarine was calculated by adopting Reynolds time-averaged method(RANS). The obtained resistance and pressure coefficient along the hull coincides better with the experiment data in references. After that, taken the calculation results for the steady flow as initial values, the unsteady flow performance of the submarine was calculated to obtain the sound dipole sources which were used as the input parameters of the boundary element calculation. Finally, the acoustic far-field was calculated by solving Ffowcs Williams-Hawkings(FW-H) equation in frequency domain. Through these calculations, the surface sound sources of the submarine and the sound directivities of the 3D sound field were analyzed. The results show that the greatest noise area comes from the transition region in flow.

An Objective Assessment Method of Digital Image Mosaic Artifacts Visibility Based on Visual Perception

YU Hong-sheng, JIN Wei-qi, LIU Xiu-sheng

2010, 31(9):  1209-1215.  doi:10.3969/j.issn.1000-1093.2010.09.013

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The difference of illumination among images to be mosaicked causes mosaic artifacts while the digital images are being mosaicked together. In order to objectively evaluate the visibility degree of mosaic artifacts in digital images, an objective assessment method of digital image mosaic artifacts visibility based on human visual perception was proposed . The processes of the method are as follows: 1) the gradient errors image is obtained according to the images to be mosaicked; 2) the just noticeable difference (JND) of the reference image is derived by considering the impacts from not only the human visual frequency sensitivity but also the brightness mask effects and the texture mask effects on visual resolution, then, the mosaic artifacts image which is visually perceptible can be acquired by subtracting the JND threshold values from the wavelet coefficients of gradient errors image; 3) the mosaic artifacts visibility (MAV) of digital image is customized with the aid of the average value as well as the information entropy of the mosaic artifacts image, and finally regarded as an objective index for assessing the image stitching seam visibility. The experiment indicates that the MAV related objective assessment result of digital image mosaic artifacts visibility is basically consistent with the one of the subjective perceptual method.

Submarine's Magnetic Field Extrapolation Using Boundary Element Method and Tikhonov Regularization

YANG Ming-ming, LIU Da-ming, LIU Sheng-dao, LIAN Li-ting

2010, 31(9):  1216-1221.  doi:10.3969/j.issn.1000-1093.2010.09.014

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In order to master the submarine's magnetic field distribution, and then study

Classification Detection of Approximately Duplicate Records Based on Feature Selection Using Ant Colony Algorithm

CAO Jian-jun， DIAO Xing-chun， DU Yi， WANG Fang-xiao， ZHANG Xiao-yi

2010, 31(9):  1222-1227.  doi:10.3969/j.issn.1000-1093.2010.09.015

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In order to realize detection of approximately duplicate records, a classification method based on feature selection using ant colony algorithm was proposed. The detection of approximately duplicate records can be regarded as a classification problem of two classes. The similar feature and normalization algorithm of three typical attribute types, such as character string, enumeration and date, were defined. Taken the similar feature vectors of two records as the classifier's input, the detection of approximately duplicated records was realized. A multi-object optimization model based on comprehensive optimization of recall rate, precision and feature set's size was set up. According to the characteristics of the problem, the multi-object optimization model was transfered into a single object optimization model. A solving algorithm using ant colony algorithm was designed. Finally, the method was validated by Euclidean distance classifier and support vector machine classifier.

Assembly Sequence Planning for Aerospace Products Based on Particle Swarm Optimization and Genetic Algorithm

ZHANG Dan₁， ZUO Dun-wen₁， JIAO Guang-ming， XUE Shan-liang₁

2010, 31(9):  1228-1234.  doi:10.3969/j.issn.1000-1093.2010.09.016

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In order to solve the assembly sequence planning for aerospace products (ASPFAP)

Research on a Method of Virtual Reliability Test for Piston Rod of Compressor

CHEN Peng-fei, SUN Zhi-li₁

2010, 31(9):  1235-1240.  doi:10.3969/j.issn.1000-1093.2010.09.017

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Three factors including stress amplitude, stress concentration and additional mo

Research on Release of Airborne Weapon Based on Dynamic Chimera Grid Technique

XU Xiao-ping, ZHOU Zhou， FAN Rui-jun， WANG Jun-li

2010, 31(9):  1241-1246.  doi:10.3969/j.issn.1000-1093.2010.09.018

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In order to study the aerodynamic interference and movement rules of external stores, computational fluid dynamics (CFD) methods were used to simulate the release process of airborne weapons in R/S UAV .Combined with 6-DOF kinetic equations, the dynamic chimera grid approach was used to realize the bomb's movement simulation, and the generalized minimal residual method (GMRES) was introduced to solve unsteady Euler equations. All major parameters, such as displacement, angular orientations and forces, and their change trends were obtained. The results show that the effect of aerodynamic interference caused by release is only significant at its beginning, and almost negligible with the increase of the distance between the aircraft and the external stores.

Research on Metric of Network Effect in Ship Formation Cooperation Anti-missile Operation

TENG Ke-nan, SHENG An-dong₁

2010, 31(9):  1247-1253.  doi:10.3969/j.issn.1000-1093.2010.09.019

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The cooperation anti-missile of ship formation is a difficult problem in theoretical research on network-centered operation. To measure the network effect, the metric models of cooperation effect in network organization were established by using graph and eigenvalue theories based on the analyses for cooperation anti-missile process , principles and network characteristics of organization in the naval ship formation. An application case was presented and simulated in condition of data link (DL) and non- DL. The results show that the node loss affects directly the maximum expected eigenvalue of anti-missile operation network, moreover, compared with non-DL, the cooperation effects of DL increases by a factor of 3-5.

Research Notes

RHA and BP Neural Network Based Constructing Method for Geomagnetic Reference Map

QIAO Yu-kun, WANG Shi-cheng, ZHANG Jin-sheng, CHEN Li-hua, ZHANG Qi

2010, 31(9):  1254-1258.  doi:10.3969/j.issn.1000-1093.2010.09.020

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The construction of geomagnetic reference map is the base and key point for geom

Regression Estimation of the Parameters of the Birnbaum-Saunders Fatigue Life Distribution

SUN Zhu-ling

2010, 31(9):  1259-1262.  doi:10.3969/j.issn.1000-1093.2010.09.021

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The Birnbaum-Saunders fatigue life distribution is one of the common distributions, a question of parameter estimation of which was discussed. A regression model was established according to its characteristics, and then least-square estimations of the parameters and confidence intervals for the shape parameter of this distribution with a simple form were also obtained by means of regression method. The approximate result was studied by the method of stochastic simulation on computer, and it reveals that the result is excellent. The advance of regression method makes an important progress for the parameter estimation of this distribution.

Block Adaptive Denoising Method of Acoustical Imaging

LIU Dan-dan, TANG Chun-rui, YUAN Gan-nan

2010, 31(9):  1263-1267.  doi:10.3969/j.issn.1000-1093.2010.09.022

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Through analyzing the mechanism of acoustical imaging and the statistical charac

Cavitation Monitoring in Centrifugal Pump Based on Sound Pressure Measurement

DUAN Xiang-yang, WANG Yong-sheng, SU Yong-sheng, ZHANG Yong-xiang

2010, 31(9):  1268-1273.  doi:10.3969/j.issn.1000-1093.2010.09.023

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The sound pressure measurement was employed to study the cavitation in centrifug

Distributed Fuzzy Automatic Censoring Cell Averaging-Constant False Alarm Rate Detection

HAO Cheng-peng， ZHANG Li-jun， CAI Long， HOU Chao-huan

2010, 31(9):  1274-1278.  doi:10.3969/j.issn.1000-1093.2010.09.024

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In order to improve the performance of multiple-sensor distributed constant fal

A Synthesized Tactical Gray-rough Decision-making Method for UCAV Based on Extended Incomplete Information

HU Jie, CAO Lin-ping₂, HUANG Chang-qiang₂

2010, 31(9):  1279-1284.  doi:10.3969/j.issn.1000-1093.2010.09.025

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To solve the problems of synthesized tactical decision-making for UCAV in incom