Issue 12,2007 Table of Contents

  • Display Type:
  • Text List
  • Abstract List
  • 1  General RF Stealth of Airborne Multifuncational Phased Array Systems
    CHEN Guo-hai
    2007, 29(12):1-4.
    [Abstract](2720) [HTML](0) [PDF 0.00 Byte](3)
    Abstract:
    It is practical and necessary for the RF stealth of the airborne electric equipments, especially for that of the antenna systems. It is the important area in the stealth of the advanced fighter. The special designed phased array can perform several tactical missions simultaneously, such as the radar, the electronic warfare, the high speed data-link and so on. It will be the most important airborne electric equipment in future. This paper presents the development trends of the RF stealth of multifunctional phased arrays in the relationship between the radiation characteristic and LPI, that between the scattering characteristic and LO and the tactical mission planning in order to make the sequence clarity and look for the key subjects to be enforced.
    2  Clutter Simulation for Airborne Pulse-Doppler Radar Based on Natural Ground Scene
    FAN Guo-zhong YANG Zheng-long JIN Lin
    2007, 29(12):5-7.
    [Abstract](2460) [HTML](0) [PDF 0.00 Byte](16)
    Abstract:
    在模拟地杂波时,直接从数字高程图(DEM)数据出发,对各小面单元进行遮挡判断,并利用PD雷达的回波信号模型,计算出各DEM单元对雷达回波的贡献,从而得到总的雷达地杂波。仿真结果表明,该方法仿真的雷达地杂波能够很好地反映出特定地面的起伏特性,从而证明该方法是有效的和实用的。
    3  Imaging Arithmetic Based on Stepped Frequency Through-wall Radar
    LI Shu-wei GAO Mei-guo FU Xiong-jun
    2007, 29(12):8-11.
    [Abstract](2667) [HTML](0) [PDF 0.00 Byte](7)
    Abstract:
    Radar through wall detecting is a kind of new technology of exploring life. In this paper, the mathematic model of through-wall electromagnetic wave is constructed. The back projection method of through - wall stepped frequency signal is deduced. The arithmetic realization flow is also in the paper. In the end, we simulate the imaging result, including both defocused and focused circumstance. The simulation result proves the efficiency of the arithmetic.
    4  Performance Analysis of Antinoise of Pseudo-random PM and Sine Frequency Modulation Combined Fuze
    XIONG Gang YANG Xiao-niu ZHAO Hui-chang
    2007, 29(12):12-17.
    [Abstract](2530) [HTML](0) [PDF 0.00 Byte](5)
    Abstract:
    First,the principle of the inter-pulse pseudo-random binary-phase code and LFM(PRBC-LFM) combined pulse trains fuze and CW PRBC-LFM combined fuze are introduced in brief.On this basis,their SNR gains(gSNRj) in signal processing from the backward of band pass filter to the forward of the correlation detection,and the overall SNR gains(gSNR) of the whole procedure after correlation detection are deduced in detail.
    5  Study on Problems of Radar Detection Range Conversion between Different Types of Targets
    WAN Fan-bing LI Xia HUA Liang-fa XING Shan-shan
    2007, 29(12):18.
    [Abstract](2652) [HTML](0) [PDF 0.00 Byte](6)
    Abstract:
    In this paper, we research in the problems of radar detection range conversion between different types of targets systemically under the conditions of constant false - alarm probability and alterable detection probability, then derivate a series relatively self-contained conversion formulas which is convenient for civil engineering application such as radar equipment argumentation, force effectiveness evaluation and optimum deployment and etc. The error analysis indicate that the max point error of range conversion formulas is under 3%, which satisfy to the evaluation of detection range in civil engineering application completely.
    6  Study and Implement of Software Radar Terminal System Based on Information Packages
    WANG De-sheng ZHAO Li-min SUN Li-guo LIU Yu-jing LI Shi-dan
    2007, 29(12):22-26.
    [Abstract](2734) [HTML](0) [PDF 0.00 Byte](9)
    Abstract:
    This paper proposes a universal software radar terminal system based on information packages. All function of the radar terminal system we designed is based on the processing of information packages. This scheme not only greatly improves the performance of radar terminal system, but also reduces the expense of developing, maintaining and extending to the lowest lev- el. It also lays a foundation for the standardization, universalization and further improvement for radar terminal system. The devel- opment of integrate circuit, computer science and network technologies provide a solid foundation for the implement of our design. The system has been implemented successfully in two types of radar systems.
    7  Low-angle Tracking Error Under Modern Signal Process Technology
    WU Hai
    2007, 29(12):27-30.
    [Abstract](2594) [HTML](0) [PDF 0.00 Byte](3)
    Abstract:
    The muhipath effect is an avoidless problem which the tracking radar among CIWS has to face. This paper introduces the mathematic model of the muhipath effect, gives out the typical radar elevation error model, then the modern signal process technology is brought forward and the paper gives out the new radar elevation error model. Finally the paper compares the new way with the typical way by simulating the low-angle tracking elevation error with MATLAB for example, and analyses the difference between them, completes the low-angle tracking error model.
    8  Existence Effectiveness Evaluation for Ground Surveillance Radar
    FEI Tai-yong DONG Peng-shu JIN Jiang CUI Kai-ping CHEN Guo-zhong
    2007, 29(12):31.
    [Abstract](2621) [HTML](0) [PDF 0.00 Byte](22)
    Abstract:
    Based on the requirement for the radar disposition and mobile conservation,exerting course affecting radar existence effectiveness have been divided into three procedures,anti-reconnaissance,anti-destroying and repairing,according to the characteristics of ground surveillance radar.Then an index system for evaluating the existence effectiveness evaluation of ground surveillance radar is founded.An evaluating model and calculating method is given by synthetically using several methods of effectiveness evaluation.The method's rationality is validated by an example.
    9  Radar Target Recognition Algorithm Based on Micro-Doppler Effect
    ZHANG Lin SHENG Wei-xing MA Xiao-feng
    2007, 29(12):35-39.
    [Abstract](2614) [HTML](0) [PDF 0.00 Byte](50)
    Abstract:
    Micro-doppler effect signal modeling and analysis are performed. A radar target recognition algorithm based on micro-Doppler effect is proposed. Improved empirical mode decomposition is adopted to extract features of micro-Doppler signal and classification using correlation matching algorithm is performed. The algorithm is varified by the simulation results.
    10  Anti-illegibility Processing for Pulse Doppler Weather Radar
    ZHANG Tao CHEN Kai ZHANG Han
    2007, 29(12):40-43.
    [Abstract](2694) [HTML](0) [PDF 0.00 Byte](7)
    Abstract:
    This article introduces the pr/nciple of anti-illegibility for doppler weather radar, describing several algorithm and simulation results. The performances of different processing manner is compared particularly. And this paper also provides an application of signal processing system of an x - band vehicle-mounted pulse Doppler weather radar, which adopts the method of DPRF for anti-illegibility based on TMS320C6701 DSP hardware platform. Finally several pictures of radar anti-illegibility results are shown as well.
    11  A Refined PGA Algorithm for P-band UWB SAR
    AN Dao-xiang HUANG Xiao-tao WANG Liang
    2007, 29(12):44-47.
    [Abstract](2609) [HTML](0) [PDF 0.00 Byte](8)
    Abstract:
    The phase gradient autofocus(PGA) algorithm has been proved to be an efficient autofocus method.It's good focusing performance is build on the base of fit statistical model and high signal-to-clutter ratio.But for the P band Ultra-Wideband Synthetic Aperture Radar(UWB SAR) image whose signal-to-clutter ratio is poor,the focusing result of PGA applied to it is not ideal.In this paper,we proposed the modified algorithm,which combined the contrast principle with tie traditional PGA algorithm.In the modified algorithm,the influence to the performance of PGA algorithm due to the low signal-to-clutter ratio of the degraded image will be effectively reduced.At the same time,this paper proposed the reference scatterer coregistration method,which can remove the shift(along the azimuth) distortion in the focused image that was caused by PGA algorithm.The algorithm proposed in this paper has been successfully used to focus some P band UWB SAR raw images data,and better-focused results were got as compared to the traditional PGA.
    12  A Fast Tracking Algorithm in Single Observer Passive Location and Tracking
    LI Da-zhi SU Ling-hua HUANG Fu-kan
    2007, 29(12):48.
    [Abstract](2604) [HTML](0) [PDF 0.00 Byte](17)
    Abstract:
    In passive tracking and location, the extend kalman filter exhibits unstable behavior characteristic and low convergence speed in bad nonlinear observation function, and relies on the initialization fully. In this paper, an algorithm for estimating slow -changing parameters firstly is given. It is proved by simulation that this new algorithm has high convergence speed and stability, and relies on the initialization slightly.
    13  Performance Analysis of the Digital Generation System for UWB Radar LFM Pulse Compression Signals
    HU Shi-bing WANG Xue-gang SI Qiang
    2007, 29(12):51-55.
    [Abstract](3287) [HTML](0) [PDF 0.00 Byte](51)
    Abstract:
    The ultra wide-band(UWB) linear frequency modulated(LFM) pulse compression signal generation systems are important research contents in modern radar technology.On the basis of the waveform storage method,a digital generation system scheme for ultra wide-band radar LFM pulse compression signals is presented in this paper.The effects of the amplitude quantization bits,the sampling frequency,the errors in the quadrature modulator and the distortion of the transmission system in frequency domain on the performance of the output signals are investigated in detail.The results are finally proved by computer simulations.All the conclusions provide important theoretical bases for the parameters selection,the performance evaluation and the performance optimization of the engineering implementation of the ultra wide-band LFM signal generation system.
    14  An Improvement of Random Pulse Train Detector for High Resolution Radar
    XING Lei LIU Ai-fang ZUO Qun-sheng
    2007, 29(12):56-58.
    [Abstract](2420) [HTML](0) [PDF 0.00 Byte](7)
    Abstract:
    Due to the size of the target is larger than the range resolution cell of high resolution radar, the backscattered power of the target is recorded as a function of time. In this paper, a novel method based on random parameters pulse train is proposed for high resolution radar target detection. Simulations show that the performance of high resolution radar detection can be improved effectively by using the new method.
    15  Multicomponent LFM Signal Detection and Parmeter Estimation Based on Hibert-Huang Transform
    CHEN Wen-wu
    2007, 29(12):59-61.
    [Abstract](2550) [HTML](0) [PDF 0.00 Byte](5)
    Abstract:
    In this paper,Hilbert-Huang transform is applied to analyze multicomponent LFM signals.The complicated signal can be decomposed into several Intrinsic Mode Functions(IMF) by the empirical mode decomposition(EMD),which can make the consequent instantaneous frequency meaningful.Thus multicomponent LFM signals can be analyzed by instantaneous frequency and Hilbert spectrum.The simulation results show its effectivity.
    16  A Convenient Data Acquisition Method Based on DSP
    YANG Xue-hui ZHAO Yong-bo SU Yan-chuan CAO Gang
    2007, 29(12):62-64.
    [Abstract](2592) [HTML](0) [PDF 0.00 Byte](27)
    Abstract:
    Taking radar signal processor that is mainly composed of ADSP-TS10l as example, this paper discusses a convenient data acquisition method, This method can acquire data conveniently when radar signal processor works normally. This method has been used in a certain radar signal processor and gets a good effect.
    17  Null Steering Using Immuning Algorithm by Controlling Only the Current Phases
    YE Jian-feng WANG Yu-feng PANG Wei-zheng LI Xiang-lin
    2007, 29(12):65-68.
    [Abstract](2696) [HTML](0) [PDF 0.00 Byte](17)
    Abstract:
    An adapted immuning algorithm is presented which uses both the gauss mutation and the clone scale control. The proposed algorithm is applied to null steering of linear array by controlling only the current phases. The premature phenomenon is overcome effectively because the diversity of gene colony which on account of disperse and separation of this algorithm. Numerical results indicate that nulls can impose both at the specified directions in the sidelobe region and in the nerghbourhood of the main beam and alse at symmetric locations with respect to the main beam. The null depth levels obtained are lower than those repored in the literatures.
    18  A Road Networks Constrained GMTI Tracking Technique Using UPF
    ZHOU Lei BAO Yang-hao
    2007, 29(12):69-72.
    [Abstract](2449) [HTML](0) [PDF 0.00 Byte](5)
    Abstract:
    A new approach to improve the performance of GMTI tracking using prior knowledge of road networks is presented. The problem of tracking an on-road target and a constrained nonlinear estimation problem are consistent essentially. Based on road networks constrained information, dynamic model is built, and a nonlinear/non-gaussian filter technique-UPF is introduced for filtering. Simulation results show that the proposal algorithm can improve the performance of tracking while reducing the computational requirements.
    19  Optimal Design of Mechanical and Electronic Synthesis for Reflective Antenna Structures
    YUE Xiao-qiang QIU Yuan-ying CAO Hong-jun WANG Cong-si YOU Fang
    2007, 29(12):73.
    [Abstract](2452) [HTML](0) [PDF 0.00 Byte](6)
    Abstract:
    Applying the theory of mechanical and electronic coupling for antennas, reflective antenna structures are optimally designed via mechanical and electronic synthesis. The optimization model of multi-loading cases with the objective of antenna gain is set up. Based on the method of feasible directions, an optimization program having certain universality and engineering practicability is compiled. The technologies of visial watch and control , pause and frezzing variable are used in optimization process. Finally, a sixteen-meter - caliber-circinal-paraboloid structure under the action of self-weight is optimally designed. And the result indicates the speedy convergence and good stability of the optimization program.
    20  Antenna Gain Test Technique by Extremum Average Method
    LI Wen-chen WANG Xue-song WANG Guo-yu LIU Sheng-li ZHANG Rui {. Unit PLA Luoyang China)
    2007, 29(12):77-82.
    [Abstract](2607) [HTML](0) [PDF 0.00 Byte](19)
    Abstract:
    How to improve the test precision of antenna gain is the key point for antenna gain test in the outfield.Through studying on the synthetic relationship between the direct and reflected signals in Source Antenna Overhead Test Range(SAOTR),a direct signal correction model using the extremum average method is provide;an antenna gain correction algorithm and measurement method in SAOTR is presented.The antenna gain test in the outfield proves the validity of this model.
    21  Effects of Position and Phase Errors on the Sidelobe Level of an Array Antenna with Subarrays
    FANG Gang WANG Xiao-mo GAO Ben-qing
    2007, 29(12):83.
    [Abstract](2665) [HTML](0) [PDF 0.00 Byte](4)
    Abstract:
    The sidelobe of an array antenna with self-locating structure is analysed in this paper. The expressions are derived which relate the cumulative probability of sidelobe to the range of element position errors , subarray position errors and a phase error in each element. The computation and simulation results show that the effect of the same position errors on the sidelobe level of an array antenna with subarrays is different when the max sidelobe of the array antenna is different.
    22  Endurance Test System Integration for T/R Modules
    HOU Fei BAI Li
    2007, 29(12):87-89.
    [Abstract](2575) [HTML](0) [PDF 0.00 Byte](7)
    Abstract:
    To verify the high reliability and longterm performance stability of T/R modules of phased array radar, the Endurance test system for T/R modules was developed. System has strong abilities of testing ,controlling and analysis. At the same time, it has high dependence and stabilization by perfect design. This article discussed the function, components and principle of the system, also the key techniques in system integration were introduced.
    23  PLL Reference Source Design Based on AD9956
    WEN Shen-jie QIAN Cheng
    2007, 29(12):90-93.
    [Abstract](2568) [HTML](0) [PDF 0.00 Byte](9)
    Abstract:
    The design of wideband high resolution frequency synthesizer is challenging. A DDS-dfiven PLL would alleviate the complexity of the loop design, and in the mean time obtain a competitive performance compared to traditional analog methods. In this paper, the realization of the reference source is discussed in detail, where AD9956 DDS chip was presented and analyzed, optimization solutions were given for better spurious performance.
    24  AnalYSiS of Phase Noise in Signal Generator Based on DDS
    WANG Jiang-tao YU Hong-biao
    2007, 29(12):94-97.
    [Abstract](2728) [HTML](0) [PDF 0.00 Byte](8)
    Abstract:
    Phase noise is the key character in direct digital frequency synthesizers(DDS) applied in the high stable frequency source.In the paper,phase noise generated by the phase truncation,the amplitude quantization,the performance of DAC and the reference clock is analyzed precisely.The effect of DDS peripheral circuit on phase noise is also analyzed.And the reason of phase noise degradation is discussed.The conclusion is useful for low phase noise DDS circuit design.
    25  Stability Analysis and Design of X-band Solid-state Power Amplifier
    LIANG Xiao-fang
    2007, 29(12):98-100.
    [Abstract](2535) [HTML](0) [PDF 0.00 Byte](9)
    Abstract:
    Stability problem in X-band solid-state power amplifier is rather evident than other lower frequency solid-state power amplifier. Cavity effect is the main factor that results in stability problem. In this paper, engineering practicable methods solving stability problem results from cavity effect are proposed after theory analysis of cavity effect, and the cavity effect problem in X-band solid-state power amplifier design is successfully resolved.
    26  Analysis and Calibration of Amplitude and Phase Errors in Signal Generator
    WAN Yong-lun SI Qiang LV You-xin WANG Xue-gang
    2007, 29(12):101-104108.
    [Abstract](2478) [HTML](0) [PDF 0.00 Byte](6)
    Abstract:
    Signal generator is one of the key components in radar transmitter.In this paper the possible sources and the influences of the amplitude and phase errors are analyzed in the linear frequency modulated(LFM) signal generator system,respectively.The model of the amplitude and phase errors of system is constructed.At the same time based on the errors analyzed,the calibration measures of the amplitude and phase is proposed,respectively,particular realization structures are given.The simulation and experiment results show that the amplitude and phase errors can be compensated effectively by means of the proposed method.
    27  Radar Information Analysis of Airborne Self-defense ECM
    LI Zhi-wei ZHONG Ai-min
    2007, 29(12):105-108.
    [Abstract](2597) [HTML](0) [PDF 0.00 Byte](19)
    Abstract:
    For the complex of airborne self-defense ECM(Electronic Counter Measures) radar information data,the analysis method of radar information data based on software process is researched.The algorithm of analysis searching for multi-target radar data is proposed.By ActiveX control technology,the analysis software applied in ECM ground support and training effect evaluation is implemented.
    28  Control System Design of Three-phase PWM Rectifier Based on DSP
    MA Hui ZHU Yong-liang ZHANG Zong-lian
    2007, 29(12):109-112.
    [Abstract](2552) [HTML](0) [PDF 0.00 Byte](16)
    Abstract:
    Based on the mathematic model of a three-phase high-power-factor PWM rectifiert voltage disturbance compensation is added to the controller and double-closed-loop PI controller is presented. In view of the requirements of response speed and protect function, the control system is designed based on the chip TMS320LF2407A. The design of hardware and software is present. Experiment results verify the control scheme.

    Current Issue


    Volume , No.

    Table of Contents

    Archive

    Volume

    Issue

    Most Read

    Most Cited

    Most Downloaded