Table of Content

31 December 2010, Volume 31 Issue 12

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Paper

Research on Position Identification of Missing Teeth of Crankshaft Based on Optimal Threshold Method

LIU Xing-hua, WANG Yu-peng, LIU Fu-shui, LIANG Hai-qiang

2010, 31(12):  1541-1545.  doi:10.3969/j.issn.1000-1093.2010.12.001

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In order to identify the engine TDC position accurately, this paper establishes

A Kind of Calibration Algorithm of Symmetrical Triangular Linear Frequency Modulated Continuous Wave Radar

HOU Zhi， MIAO Chen， WU Wen， ZHANG Duo

2010, 31(12):  1546-1550.  doi:10.3969/j.issn.1000-1093.2010.12.002

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Since the range and velocity measurement accuracy are influenced by resolution and fence effect of FFT transform, the frequency domain calibrations for the measurements in the linear frequency modulated continuous wave (LFMCW) radar system are needed in the practical applications. This paper discusses the range/velocity estimation principles and decoupling algorithms in LFMCW radar system, and presentes a calibration method based on two-dimension frequency domain. By using the method, the radar echo signals are processed in two-dimension frequency domain and the processing results are calibrated respectively. It eliminates the influences of Doppler frequency insensitive target’s range-velocity coupling and fence effect to improve the range and velocity measurement accuracy. Simulation and experiment results verify the effectiveness of the method.

A Fast Image Registration Algorithm Based on Fourier-Mellin Transform for Space Image

JIAO Ji-chao₁, ZHAO Bo-jun₁, ZHOU Gang₂

2010, 31(12):  1551-1556.  doi:10.3969/j.issn.1000-1093.2010.12.003

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In order to realize the detection of the dim space debris in low SNR, a fast ima

Research on Interference Suppression of Passive Radar Based on Antenna Beam Focusing

WANG Kui, TAO Ran, SHAN Tao

2010, 31(12):  1557-1561.  doi:10.3969/j.issn.1000-1093.2010.12.004

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In passive radar system utilizing non-cooperative illuminator, the interference

A New Optimized Algorithm of Compensatory Anode

JI Dou， WANG Xiang-jun， YANG Zhen

2010, 31(12):  1562-1566.  doi:10.3969/j.issn.1000-1093.2010.12.005

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By using point-electrode model, the analytical electric field expressions of co

An Intelligent Model of Data Classification with Immune Characters

HUANG Hong， LIU Zeng-liang， YU Da-tai， ZHOU Shao-hua

2010, 31(12):  1567-1572.  doi:10.3969/j.issn.1000-1093.2010.12.006

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The model of data classification and protection is proposed by combining onto

The Guidance Information Reconstruction of Semi-strapdown Imaging Seeker Guidance System

SONG Jian-mei， KONG Li-xia，FAN Jian-hua

2010, 31(12):  1573-1579.  doi:10.3969/j.issn.1000-1093.2010.12.007

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As the semi-strapdown seeker's dynamics is seriously nonlinear, EKF (Extended Kalman Filter) for guidance information reconstruction can not meet the requirements of high accuracy guidance. This paper uses UKF (Uncented Kalman Filter) to estimate the gimbal angular rate, and at the same time, the quasi-proportional guidance information was reconstructed by combining missile attitude rate coming from IMU with the target position information coming from seeker's imaging plane. The paper finally makes a three-dimentional practical simulation of the missile based on UKF, and compares the gimbal angular rate estimation accuracy of EKF with that of UKF. Simulation results shows that the reconstructuion accuracy of the guidacne information via UKF is better, which can guide the missile to precisely attack the target.

Mobile Target Query in Wireless Sensor Network with Tracking Chain

DENG Ke-bo , LIU Zhong

2010, 31(12):  1580-1586.  doi:10.3969/j.issn.1000-1093.2010.12.008

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Refering to problems of direct query, a tracking-chain based mobile target query scheme is proposed. The tracking chain is firstly defined as a bi-directional chain consisting of the sensor nodes on the target route and reserving the target spatio-temporal information. The method to build the tracking chain and to query the target with the tracking chain is presented. The target query cost based on tracking chain is also analyzed theoretically. The simulated results show that, the proposed scheme has fewer searching hops and lower failure probability than the direct query, and consumes less energy than the tracking-tree based query scheme as the target query frequency is lower or the target movement frequency is higher.

The Magnetic Field Modeling and Analysis of Giant Magnetostrictive Actuator for Jet Servo Valve

LI Yue-song₁, ZHU Yu-chuan₁, WU Hong-tao₁, TIAN Yi-song₂, NIU Shi-yong₂

2010, 31(12):  1587-1592.  doi:10.3969/j.issn.1000-1093.2010.12.009

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On the basis of introducing the structure of the giant magnetostrictive actuator

Blind Identification of the Primitive Polynomial of m-Sequence with Error Using High-order Statistic

SU Shao-jing, WU Wen-jun, HUANG Zhi-ping, LIU Chun-wu

2010, 31(12):  1593-1598.  doi:10.3969/j.issn.1000-1093.2010.12.010

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The blind identification of the primitive polynomial of m-sequence with error i

Research on Target Route Planning of Confrontation of ESJ to Radar Network

NI Tian-quan, WANG Jian-dong, LIU Yi-an

2010, 31(12):  1599-1603.  doi:10.3969/j.issn.1000-1093.2010.12.011

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In order to deal with the problem of penetrating radar network that is armed continually and strictly, this paper studies route planning algorithm of target/formation under the cover of ESJ to confront a radar network. The algorithm calculates a single radar’s radius of detection area, then turn the route planning study of target/formation penetration radar network under the cover of ESJ into the issue of network connectivity graph composed of public string in radar network through the analysis of two-radar interference penetration. Finally, through combination heuristic searching, a radar network route planning optimization method of target/formation under the cover of ESJ is given. It turns out to be effective and feasible.

Reliability Analysis of Multi-state System with Multiple Performance Parameters Based on Vector-universalGenerating Function

LI Chun-yang， CHEN Xun， YI Xiao-shan， TAO Jun-yong

2010, 31(12):  1604-1610.  doi:10.3969/j.issn.1000-1093.2010.12.012

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The universal generating function plays an important role in reliability analysi

Experimental Technique and Analysis

Study on Cavitation Tunnel Experiment of Accelerating Rotating Propeller Noise

FENG Yuan， TAO Ran, ZHUO Zhi-hai

2010, 31(12):  1611-1616.  doi:10.3969/j.issn.1000-1093.2010.12.013

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In order to obtain the relation between radiated noise and propeller noise while ship propeller is in

Research Notes

Application of Metallic Sphere in Rotator ISAR Imaging

ZHAO Jing-cheng, HONG Tao

2010, 31(12):  1617-1621.  doi:10.3969/j.issn.1000-1093.2010.12.014

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The ISAR images of typical scattering body which processed according to the gene

An Improved Anti-jamming Algorithm Based on Space-time Adaptive Processing

REN Chao, WANG Yong-qing

2010, 31(12):  1622-1626.  doi:10.3969/j.issn.1000-1093.2010.12.015

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Traditional space-time adaptive processing algorithum can suppress the jams from different directions effectively in which the space is different from signal direction, but it can not suppress the narrowband jams which come from the same direction with the available signal absolutely in the meantime, it filters part of useful signals. The adaptive algorithm of multistage IIR notch filter is discussed. Then an improved space-time adaptive processor which combines multistage IIR notch filter with space-time FIR filter bank is proposed. The proposed method can suppress both narrowband jams and wideband jams effectively and improve the performance of the communication system and enhance the output SINR. The results of computer simulation verify the efficiency of the proposed method.

New Method for Scalar Miss Distance Measurement Based on the Fractional Fourier Transform

DENG Bing, TAO Ran, DONG Yun-long₁

2010, 31(12):  1627-1631.  doi:10.3969/j.issn.1000-1093.2010.12.016

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Since the hypothesis of constant amplitude and constant frequency, adopted by the conventional miss distance measurement method using Doppler information, leads to notable estimation error of Doppler frequency around the closest point approaching the target, a quasi real-time method of scalar miss distance measurement is proposed based on the assumption of constant amplitude chirp signal. Through increasing the fitted segment time used for Doppler frequency, the integration duration is prolonged effectively. What's more, the proposed method is realized via the fast discrete algorithm of the fractional Fourier transform. The simulation results show that, compared with the real-time method of scalar miss distance measurement based on the FFT, this method can obtain higher accuracy and better robustness, particularly when the signal-noise-ratio is low relatively. However, the computation complexity rises slightly.

Adaptive Dwell Scheduling in Phased Array Radars Based on Extended Horizon

JIAN Fu-sheng, DUAN Mu-gang, XU Yue-min, YIN Ze-jie

2010, 31(12):  1632-1636.  doi:10.3969/j.issn.1000-1093.2010.12.017

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It is hard for conventional adaptive scheduling mechanisms in phased array radars to analyze the schedulability of tasks when their timing constraints and energy constraints are taken into account. According to dynamic system workload, novel task models are built for various dwell requests, and an adaptive scheduling algorithm based on extended horizon is presented, which extends the scheduling horizon from one scheduling interval (SI) to multiple SIs. In every SI the dwell requests are scheduled by synthetic order of priority and deadline. Simulation shows that the scheduling performance is predictable, compared with conventional method, the algorithm proposed not only increases time utilization, but also effectively decreases the missing ratio of tasks.

A Fast Reduced-rank Adaptive Beamforming Based on Generalized Sidelobe Canceller

HUANG Fei，SHENG Wei-xing，MA Xiao-feng

2010, 31(12):  1637-1642.  doi:10.3969/j.issn.1000-1093.2010.12.018

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For most traditional reduced-rank adaptive beamforming algorithm based on Generalized Sidelobe Canceller (GSC), the rank reducing matrix is achieved by eigendecomposition which brings the computational burden. To alleviate the computational burden and achieve real-time processing, a new fast reduced-rank adaptive beamforming algorithm based on GSC (FRGSC) is proposed. It uses a set of intermediate data vectors in the lower branch of GSC to construct the rank reducing matrix. Also, in order to achieve the robustness, all available snapshots have been used to obtain the rank reducing matrix. The computational burden to obtain the rank reducing matrix of the traditional reduced-rank beamforming algorithm based on GSC is on the order of O((N-1)³), while the FRGSC method needs only one complex multiplication and a little complex additions. The FRGSC method is very simple in design and programming. In practical application, this method has more excellent real-time responsibility, and it can be used to deal with the real-time adaptive array processing for continuous wave radar. The simulation results show that the fast reduced-rank adaptive beamforming algorithm has very good beamforming performance, and the validity of this new method is demonstrated.

Trajectory Planning for Optical Radar of Multi-constraints

MENG Zhong-jie， CHEN Kai， HUANG Pan-feng， YAN Jie

2010, 31(12):  1643-1647.  doi:10.3969/j.issn.1000-1093.2010.12.019

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To enhance the tracing capability of optical radar, trajectory planning technology needs to be studied. Considering all strong constraints, the model for trajectory planning is constituted; the objective function is designed with tr(P) and det(FIM) and the trajectory is planned with PLKF. Simulation shows that along the planned trajectory, all the constraint conditions of optical radar passive tracking can be met and the optical radar has a high precision and speed. It also verifies the validity of trajectory planning technology and lays the foundation to real war optical radar’s reasonable application.

Ultra-wideband Frequency Agile Source Design and Implementation Based on DDS and Direct Frequency Synthesis

LIU Lin， TIAN Jin-jun， LIU Zhao-hui

2010, 31(12):  1648-1652.  doi:10.3969/j.issn.1000-1093.2010.12.020

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Based on the detailed analysis of DDS output signal’s spectrum spurious, a frequency agile source implementation scheme by combining DDS technology with dire

Optimized Multi-channel DDC Technology and Its Implementation

WANG Tao， FU Lian-qing， YANG Li-sheng， CAO Hai-lin

2010, 31(12):  1653-1658.  doi:10.3969/j.issn.1000-1093.2010.12.021

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Multi-channel digital down conversion is the key technology of digital array receiver. However present solutions occupy relatively more resources, so this paper puts forward an optimized method. One bit quantization is introduced, which is used to quantize the orthogonal sine signals of NCO and convert them to square waves. The square waves only have two electrical levels, and include all the signals of sine waves. So the numerical controlled oscillator is simplified by a XOR gate and a NOT gate and also the mix circuits are implemented with two multipliers replaced by two multiplexers, so as to simplify the multi-channel digital down conversion circuits and digital Costas loog design. The FPGA implementation circuit is designed by ISE software, and simulation analysis is also carried out by MatLab and ModelSim software. Compared with conventional methods, the number of digital down conversion channels to be implemented in the same FPGA chip can be improved by more than 40% with the system performance and the operating speed not affected.

A Novel Autofocus Optimization Algorithm Based on Minimum Entropy Criterion

GAO Xu-gang， SU Wei-min， GU Hong

2010, 31(12):  1659-1662.  doi:10.3969/j.issn.1000-1093.2010.12.022

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Minimum entropy method is a method of Synthetic Aperture Radar (SAR) autofocus processing, but it requires whole setting area searching when searching optimized Doppler rate, and has large amount of computation. The paper proposes a novel autofocus optimization algorithm based on minimum entropy criterion. Based on the relationship between entropy and the Doppler rate, the dichotomy which is employed can quickly search optimization Doppler rate and greatly reduce the amount of computation. The processing results of the measured data show the validity of the presented method.

A Finite-time Stabilization Control of a Kind of Nonholonomic Chained System

WANG Yi-qing, LI Sheng, CHEN Qing-wei

2010, 31(12):  1663-1668.  doi:10.3969/j.issn.1000-1093.2010.12.023

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Aimed at the finite-time stabilization problem of the 3-dimensional nonholonomic chained system, two kinds of finite-time stabilization controllers are proposed in this paper based on the switching control strategy, and the selection conditions of the controller’s parameters are given. The proposed controllers utilize the homogeneous system approach and terminal sliding mode control theory respectively. All the states of the system can converge from any non-equilibrium state to the equilibrium in finite time. Finally, the stabilization problem of the 3-dimensional nonholonomic chained system is solved by utilizing the proposed controllers' and the explicit forms of the controllers are presented. The effectiveness of the proposed finite-time stabilization controllers is shown through simulation.

Double-loop Sliding Variable Structure Controller for Semi-strapdown Stability Platform

LIU Wei, KE Fang, ZHU Bin， FAN Jian

2010, 31(12):  1669-1673.  doi:10.3969/j.issn.1000-1093.2010.12.024

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The mathematic model is established to ensure the system semi-strapdown seekers robustness in the environment of a variety of disturbances and uncertainties. Through analyzing the influence of semi-strapdown platform from interference moment, missile disturbances and structure parameter change, the double-loop sliding variable structure controller is proposed. By theoritical research and mathematic simulation, the results prove that the double-loop sliding variable structure controller can be applied with the precise angular position sensor and excellent differential algorithm in semi-strapdown stablized platform servo-loop, and it is adaptive to structure parameter change and it has great robustness to interference moment and missile disturbances.

Research on Effect of Gradient on Vehicular Dead Reckoning System

JIA Ji-chao₁, LI Sui-lao₁, WU Xun-zhong₂, YAO Jun-jun₃

2010, 31(12):  1674-1679.  doi:10.3969/j.issn.1000-1093.2010.12.025

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When road gradient changes, vehicle load transfer can be caused. Load transfer results in tire radius change, so vehicular dead reckoning is affected. Dead reckoning error model on gradient road was established, and the vehicle navigation experiment on gradient road was made. The results show that the odometer calibration coefficient approximately decreases by 1‰ when longitudinal gradient increases 1°.

Research on Compatibility Analysis Between GPS and Galileo Systems Based on Code Tracking

WANG Yao, YANG Shen-yuan, YU Bao-guo

2010, 31(12):  1680-1685.  doi:10.3969/j.issn.1000-1093.2010.12.026

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The traditional Global Navigation Satellite System (GNSS) compatibility analysis methodology is deduced by receiver prompt channel, which could not reflect the effect of interference onto code tracking. A interference coefficient, called Code Tracking Spectral Sensitivity Coefficient (CT_SSC), is introduced. And a GNSS compatibility analysis methodolody based on code tracking is presented. Then the CT_SSC characteristic among signals is analized under various signal setting and the GNSS compatibility traditional methodology. Finally, on the basis of accurate satellite-ground link budget modeling, intrasystem interference in GPS and intersystem interference between GPS and Galileo are caculated by using compatibility methodology based on code tracking. The results show that when GPS C/A signals is desired signals, all over the world the maximum intrasystem interference is 1.26 dB, meanwhile intersystem interference of Galileo system on GPS system is 0.63. While the effects of GNSS interference signals will be understimated by using traditional method.

Analysis of Multi-beamforming Algorithms for GPS Adaptive Array

ZHANG Wen-ming

2010, 31(12):  1686-1690.  doi:10.3969/j.issn.1000-1093.2010.12.027

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Power-inversion adaptive algorithm is the most popular method of GPS antenna ar

An Arbitration Method on SCI/RT Arbitration Transmission

CUI Jian， LIU Xing-chun₂， LI Zheng₂

2010, 31(12):  1691-1696.  doi:10.3969/j.issn.1000-1093.2010.12.028

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The scalable coherent interface for real time(SCI/RT) TRAIN protocol is analyzed. The results show the ringlet capacity is wasted with heavy ringlet throughput, and in case of the heavy ringlet load, the priority inversion is appeared. When the ringlet has hotspot nodes, the state of capacity wasted is greatly dependent on the position of blocked node. A new method based on broadcasting status of input queue is proposed. By reducing the rate of ticket rejecting, the new method transfers packages more effectively than the standard one. The SCI/RT ringlet with 6 nodes is simulated by the OPNET^TM software. The results show that the new method gets more throughput and lower transferring delay than the standard one, and it reduces the priority inversion problem.

Bi-level Programming Method for Task Scheduling in Wireless Sensor Networks

DAI Liang, SHEN Zhong, CHANG Yi-Lin, ZHANG Ying, YAN Zhong-Jiang

2010, 31(12):  1697-1701.  doi:10.3969/j.issn.1000-1093.2010.12.029

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To solve the problem of completing the tasks within the possibly shortest time, and fully using the network resources, a bi-level programming model for optimal task scheduling based on divisible load theory is proposed. Taking into account of the rationality of task scheduling in inter-cluster and intra-cluster simultaneously, the optimal solution for the ratio of tasks allocated from SINK node of cluster head to tasks allocated from cluster head to normal nodes is obtained, and the closed-form solution for the shortest time required by finishing the application is given. Finally, the simulation results show the correctness of the theoretical analysis.

Traversable Area Extraction Using LADAR Sensor

YUAN Xia, ZHAO Chun-xia

2010, 31(12):  1702-1707.  doi:10.3969/j.issn.1000-1093.2010.12.030

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An algorithm to detect traversable area from ladar point cloud based on