Issue 2,2011 Table of Contents

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  • 1  Design of Doppler Radar Products by Geographical Information System
    ZHOU Xin HE Jian-xin LIU Yan TANG Zhi-ya
    2011, 33(2).
    [Abstract](3035) [HTML](0) [PDF 0.00 Byte](188)
    Abstract:
    文中抛弃常规的雷达产品设计方法,利用地理信息系统软件进行雷达产品设计和开发.首先利用托盘处理的方式实时地对雷达基数据进行资料预处理,去除噪声、脉动及速度模糊对雷达产品设计带来的影响,在进行雷达数据格式转换后,利用具有强大图形图像处理功能的地理信息系统软件生成气象业务中常用的雷达产品,同时开发出常规方法不易实现的三维雷达产品.最后将文中的设计与常规方法设计的产品进行了对比分析,同时给出了三维雷达产品实例.
    2  Impact of Different Impedance Matching Network on Performance of Ferroelectric Phase Shifter
    LIANG Fei LV Wen-zhong ZHOU Yan-ling WANG Xiao-chuan
    2011, 33(2).
    [Abstract](2638) [HTML](0) [PDF 0.00 Byte](29)
    Abstract:
    针对铁电体透镜式移相器的阻抗失配问题,分别采用3级、4级和5级的1/4波长阻抗匹配器结构,对铁电体移相器进行阻抗匹配调试仿真.通过对比不同匹配级数的匹配效果,最终确定了4级的匹配方案,并通过进一步优化器件结构,设计出的铁电体移相器在X频段内可实现360°相移,驻波比在主带宽内小于1.2,反射系数大于20 dB,中心频率处反射系数达到40 dB,信号传输系数在低频处小于1.1 dB,在高频处为1.5 dB,实现了铁电体移相器较好的阻抗匹配.
    3  Design of Planar Ultra-wideband Antenna with Dual Band-notched Characteristics
    LIU Qi-kun ZHOU Bo DOU Dong-liang XING Feng
    2011, 33(2).
    [Abstract](2850) [HTML](0) [PDF 0.00 Byte](129)
    Abstract:
    设计了一种带有2个陷波频段的超宽带天线.天线的缝隙和馈电枝节采用相反的梯形结构,以实现较好的阻抗匹配.通过在宽缝隙中增加2个线形枝节和1个"E"形结构,使得天线在3.0 GHz~3.9 GHz和5 GHz~6 GHz 2个频段内出现频率阻断.根据天线的阻抗曲线,给出等效谐振电路并对陷波产生的原理进行了分析.最后对天线的远场辐射特性进行分析和阐述,测试结果良好,达到了陷波超宽带天线频率阻断的效果.
    4  A Floating Plate Modulator for MPM
    LI Chun-yan WANG Chao CHEN Han-xing
    2011, 33(2).
    [Abstract](2558) [HTML](0) [PDF 0.00 Byte](22)
    Abstract:
    微波功率模块将真空电子器件和固态器件的优点有效地结合起来,其结构设计十分紧凑,需要体积小、重量轻的调制器组件为小型行波管控制栅极提供视频控制脉冲.文中分析了各种脉冲传递方式的优缺点,结合微波功率模块的电路特点,选择使用变压器进行脉冲耦合.介绍了一种新颖的浮动板调制器电路,该电路拓扑简洁,元器件较少,适用于电路的小型化.给出了该调制器电路的组成和工作原理,总结了实验结果,证明了该电路的可行性.
    5  A Study on Beamforming Method of Digital Receiving Array Antenna and Its Experiment
    CHEN Wen-jun HU Yong-jun
    2011, 33(2).
    [Abstract](2635) [HTML](0) [PDF 0.00 Byte](24)
    Abstract:
    针对数字阵列天线的发展需求,介绍了用快速傅里叶变换法、数字混频低通滤波法、多相滤波正交下变频法等3种数字接收机通道内信号的幅度、相位计算方法,给出了数字阵天线接收通道的内校准法和外校准法,以及校准后的天线方向图计算公式,并用实验结果检验了上述方法的有效性.
    6  A Study on Unbiased Estimation Data Method of Field Measure in Random Vibration Environment
    CHEN Guo-ping
    2011, 33(2).
    [Abstract](2898) [HTML](0) [PDF 0.00 Byte](172)
    Abstract:
    已有的数据归纳方法中,极值包络法没有体现数据样本量和数据分布特性,文中依据人为给定置信度的统计容差法和改进的统计容差法给数据归纳的结果带来一定的偏差.文中依据正态分布下"累积频率函数"计算公式,结合参数的无偏估计理论,推导出给定慨率下基于统计的与置信度无关的随机实测上限归纳方法,同时运用这一方法对国内某运输机机载雷达安装平台测量的数据进行处理,得到振动环境下实测归纳曲线.
    7  Tracking Mode and Tacking Precision Analysis of Navigation Satellite
    JIANG An ZHAO Hang
    2011, 33(2).
    [Abstract](2503) [HTML](0) [PDF 0.00 Byte](22)
    Abstract:
    采用卫星仿真工具包对全球卫星导航系统包括GPS、Galileo、Compass等导航卫星星座的地面站天线方位、俯仰跟踪特性进行了仿真分析,以大口径地面接收天线为例讨论了可行的地面站天线座架形式和跟踪体制.并综合常规卫星通信抛物面天线精度分析方法和测控雷达天线的精度分析方法对跟踪精度进行了系统的分析,分析结果可作为今后类似系统的设计参考.
    8  Blind Source Separation Algorithm in MIMO Radar and Communication Application
    ZHOU Wan-xing
    2011, 33(2).
    [Abstract](2937) [HTML](0) [PDF 0.00 Byte](46)
    Abstract:
    In this paper,blind source separation algorithm is applied to realize electronic counter-countermeasure of multi-input multi-output(MIMO) radars and symbol detection of MIMO communication systems.First,signals are separated by using mutual dependence among signals and between signal and interference.In radar application,signals can be detected through matching process;while in communication application,some training sequences can be utilized to conduct signal matching and phase/amplitude correction.Simulati...
    9  Design of Impulse Ground Penetrating Radar Miniature Control and Acquisition System
    DAI Shun FANG Guang-you
    2011, 33(2).
    [Abstract](2989) [HTML](0) [PDF 0.00 Byte](172)
    Abstract:
    According to the demand of the low cost,the high precision and the minimization for the impulse ground penetrating radar(GPR),a ultra wideband(UWB) GPR signal control and data acquisition system based on a micro programmed control unit(MCU) is developed.The step delay equivalent time sampling principle is analyzed.The system structure is described.The design methods and the principles of the trigger signal circuit and the acquisition hardware are described.The flowchart of the MCU firmware and functions of ...
    10  Key Technologies and Development Trends of Helicopter Collision Avoidance Radar
    XU Yan-guo
    2011, 33(2).
    [Abstract](2600) [HTML](0) [PDF 0.00 Byte](35)
    Abstract:
    Helicopter collision avoidance radar can detect low altitude obstacles located at the flight route,which is an effective way to ensure the safety of low flying helicopter.Some necessarily characteristics of helicopter collision avoidance are included such as high resolution,large scan volume,high data refreshment and high detection capability.Based on the analysis of radar characteristics,the key technologies of helicopter collision avoidance radar are extracted in this paper,then its development trends are...
    11  Influence of Turbulence Effect on Atmospheric Duct Propagation over Sea
    SUN Fang ZHAO Zhen-wei WANG Hong-guang LIN Le-ke CHENG Xian-hai
    2011, 33(2).
    [Abstract](2735) [HTML](0) [PDF 0.00 Byte](30)
    Abstract:
    海上的湍流大气会引起海上大气波导传播中能量的严重泄漏,进而影响雷达对目标回波信号的正确判断。文中通过利用微波测距机进行连续测距,反算出海面上大气折射率的起伏变化,继而得到能够反映湍流特征的折射率随机扰动项,再将折射率扰动项分别加入到抛物方程模型和射线追踪技术中进行了湍流环境下的传播损耗和射线轨迹计算。计算结果表明,在海上波导传播计算模型中考虑折射率扰动项,可以更加合理地进行雷达系统效应评估,准确地反映大气湍流对海上电波传播的影响。
    12  Measurement Method for Radar Precision Based on ADS-B Date
    SUN Guo-zheng WANG Suo-jian DONG Yang
    2011, 33(2).
    [Abstract](2882) [HTML](0) [PDF 0.00 Byte](36)
    Abstract:
    The range of measurement for radar precision based on global position system(GPS) data has been analyzed.The principle,the data form and the precision of the automatic dependent surveillance-B(ADS-B) have been given.A method to measure the precision of the radar based on the ADS-B data has been proposed and the effectiveness of the method has been analyzed.The experiment results show that the method can be used to measure and check the precision of the phased array radar with high precision,which is easy fo...
    13  Deception Interference Supression Algorithm Based on Four-channel for SAR
    ZHANG Shuang-xi SUN Guang-cai LIU Yan-yang ZHOU Feng XING Meng-dao
    2011, 33(2).
    [Abstract](2734) [HTML](0) [PDF 0.00 Byte](26)
    Abstract:
    In this paper,the existing interference suppression algorithm for SAR especially multi-channel interference suppression algorithm is studied,and then a new deception interference suppression algorithm based on four-channel is proposed.At the first,the signal model and the mechanism of deception interference is introduced,after that an analysis of it is made.Then the similarities and differences between deception interference and echo signals from scene are compared from the perspective of four-channel signa...
    14  A New Method of Discriminating Target Separation Using Wide Band Signals
    LI Bao-zhu YUAN Qi HE Pei-kun MAO Er-ke
    2011, 33(2).
    [Abstract](2984) [HTML](0) [PDF 0.00 Byte](156)
    Abstract:
    It is important to keep watch on target separation for discrimination of ballistic missile defense.This paper mainly studies on the method of target separation detection using wideband signal and discusses selection of detection threshold and definition of position relative matrix.A method of target separation based on position relative matrix is put forward and is verified by test data.The test results shows the method is easy to put into use and has high reliability.
    15  A Coherence Optimization Method Based on Genetic Algorithm
    MA Li-hu LI Yang HONG Wen
    2011, 33(2).
    [Abstract](2674) [HTML](0) [PDF 0.00 Byte](33)
    Abstract:
    By searching for the optimal mechanism in various scattering mechanisms,coherence optimization process can get the maximum coherence.The process can be used to improve the coherence between SAR images for InSAR system.And for POLInSAR system,it not only can be used to improve the coherence between different polarization channels,but also use can help to improve classification and vertical structure parameters estimation process.So it is very important to SAR.The proposed coherence optimization algorithm has...
    16  Design and Implementation of Weather Operation Mode with Compensation of Rain for Airborne Radar
    ZHANG Liang YIN Qie HAN Hai-feng
    2011, 33(2).
    [Abstract](2620) [HTML](0) [PDF 0.00 Byte](23)
    Abstract:
    高空降雨云层作为一种气象目标,也是对雷达波的吸收体,降雨路径上造成的衰减会对气象信息的探测带来严重的影响。文中设计了一种具有降雨路径补偿的机载雷达气象方式,引入了降雨区衰减和降雨率的关系,将近端降雨区的衰减量作为参数解算远端降雨率,并对其原理、算法和实现方法作了详细阐述。通过对实测数据处理验证表明:具有降雨路径补偿的气象方式可以更准确地反映气象环境,保证飞行安全。
    17  A Study on Coherent Digital Wideband Phased-array Radar Systems Based on Dechirp Processing
    ZHU Feng-bo YANG Wen-jun DENG Zhen-miao
    2011, 33(2).
    [Abstract](2748) [HTML](0) [PDF 0.00 Byte](36)
    Abstract:
    Two technical difficulties in making wideband phased array radar work coherently are studied in this paper.Resolve the restriction of the aperture traverse delay,and accomplish beamforming in space when transmitting the signal.Accumulate the energy of signals achieved by all array elements when receiving.Eliminate random jitter in delay of reference signal and make echos coherent in different cycles.This paper analyzes these problems,summarizes the status quo of beam-forming and coherent signal processing i...
    18  Parameter Estimation for Moving Target in Millimeter-wave Ultra-short-range Linear FMCW Radar
    ZHANG Xin ZHANG Rong-quan GONG Hai-lie
    2011, 33(2).
    [Abstract](2778) [HTML](0) [PDF 0.00 Byte](46)
    Abstract:
    Aiming at the Doppler spectrum aberration and range-velocity coupling phenomena in accelerated moving environment for millimeter-wave short-range linear FMCW radar,a novel method is presented.which can estimate the target's acceleration,velocity and range effectively.The method can also be used for compensating the Doppler signal with the estimated acceleration,solving Doppler aberration and range-velocity coupling and improving the detection performance and parameter estimation precision of the accelerated...
    19  Amplitude-phase Error Calibration of Transmit Array in Microwave Sparse-array Radar
    LIU Jun-chi YANG Ming-lei CHEN Bai-xiao
    2011, 33(2).
    [Abstract](2936) [HTML](0) [PDF 0.00 Byte](172)
    Abstract:
    The amplitude-phase error model of transmit array in microwave sparse-array synthesis impulse and aperture radar,is constructed in this paper.And two calibration methods,which are near field method based on narrow impulses and far field method based on direct-path waves,are studied.The former method receives different-frequence narrow impulses from the near field antennas,and extracts the amplitude-phase error by channel separating and spectrum analysis.The latter one receives the direct-path waves from the...

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