Issue 11,2007 Table of Contents

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  • 1  Deep Space Detection Radar and the Analysis of its Key Technologies
    NI Jia-li
    2007, 29(11):1-5.
    [Abstract](2661) [HTML](0) [PDF 0.00 Byte](4)
    Abstract:
    Deep space detection is an important part of research in space technology, and deep space radar is the important equipment for deep space detection. The type of deep space radar and the role in the deep space detection are described in this paper. The relationship and difference with the Deep Space Network (DSN) are addressed. The construction and feature of American GSSR deep space radar is studied. The primary theory of information extraction in deep space radar for deep space detection is presented. The key technologies and its develoning trends are discussed.
    2  Method of ATR Based on Complexity Analysis
    WEI Wei JIANG De-fu
    2007, 29(11):6-8.
    [Abstract](2471) [HTML](0) [PDF 0.00 Byte](3)
    Abstract:
    High range resolution profiles (HRRPs) give the distribution of the scatterers of radar targets along the radial dimension, which is closely related to the target geometry. In this paper, an HRRP, seen as a series, is pre-processed by using a newly introduced algorithm, then the Lempel-Ziv complexity of the pre-proeessed series is calculated and is used for target recognition. The experimental results demonstrate its effectiveness.
    3  Application of Optical Fiber Technology in Radar System
    CHEN Mei-jun
    2007, 29(11):9-12.
    [Abstract](2602) [HTML](0) [PDF 0.00 Byte](17)
    Abstract:
    This article enumerated the optoelectronic technology to apply in the Modem Radar several aspects, and the key introduction optical fiber technology in the phased-array radar application, had pointed out the design optical fiber transmission system key was the design appropriate fiber optic transmission adapter and enable various ways number also to arrive according to what is believed. In the article in view of the phased-array radar, after introduced the submatrix adapter and the processor adapter as well as the multi-channel signal different way transmission time delay design specifically. This system uses modular adaptive the fiber optic transmission , May realize the data real-time transmission and the control, and has the extendibility,Simultaneously in the article also introduced one kind more practical and simple method, solves the fiber optic transmission phased-array radar system synchronized signal problem. This system works good in the experimental process, has the very big project significance in the phased-army radar system.
    4  Study of CCD Laser Theodolite Calibration Method for Radar on Warship
    LIU Yong YE Xian-wu LI Xing-min
    2007, 29(11):13-16.
    [Abstract](2477) [HTML](0) [PDF 0.00 Byte](3)
    Abstract:
    This paper puts forward to obtain the data named true value with the CCD laser theodolite in calibration for radar on warship. It analyzes the calibration principle. It introduces the key technique of calibration. It gives a applied result. The CCD laser theodolite calibration method overcome the shortage in traditional optics and Signal source calibration method. It provide the highest accuracy data. The system operation is simple and fast. The calibration method is scientific and reasonable. It has good using in general. It has the expansion value.
    5  Evaluation of BAQ Algorithm for Spaceborne SAR Raw Data Compression
    QI Hai-ming YU Wei-dong TIAN Xu-wen YUAN Xin-zhe
    2007, 29(11):17-21.
    [Abstract](2487) [HTML](0) [PDF 0.00 Byte](13)
    Abstract:
    In order to know the performance of algorithm for space-borne SAR raw data compression and choose proper compression scheme, evaluation of compression algorithm is indispensable. By defining some of evaluation parameters, this paper utilizes actual ground simulation raw data to evaluate Block adaptive Quantization (BAQ) algorithm on different data separation scheme and compression ratio respectively. Numerical experiments show that BAQ algorithm neither affects spatial resolution nor generates geometric distortion. It has only a little effect on radiometric resolution. The distortion of image main-lobe peak can't be corrected uniformly. At the same time, this evaluation method can be used in evaluation of other algorithms for SAR raw data compression.
    6  Raw Data Simulation of Ground Scene in Spaceborne Bistatic SAR
    WANG Min LU Xing-qiang LIANG Dian-nong
    2007, 29(11):22-24.
    [Abstract](2617) [HTML](0) [PDF 0.00 Byte](17)
    Abstract:
    In bistatic SAR raw data simulation of ground scene, the algorithm of computing bistatic backscatter coefficients of ground scene is discussed with the facet model and Kirchhoff bistatic backscatter model. Raw data simulation is processed in time-domain to maintain accurate phase of bistatic SAR signal. Digital elevation model of real-world is used in computer simulation. After imaging of the raw data and interference processing, the results demonstrate that the bistatic backscatter property and phase information are accurately simulated.
    7  Research on Space Location Algorithm for Moving Piont Scatter
    ZHOU Yu-xiang WEI Guo-hua WU Si-liang
    2007, 29(11):25-28.
    [Abstract](2522) [HTML](0) [PDF 0.00 Byte](3)
    Abstract:
    In this paper a space location algorithm for moving point scatter based on impulse radar is presented. According to the characteristic of impulse radar, this algorithm collects return signal by equivalent sampling using range gates. Then measure the distance differences of every range gate between the different receiving antennas by correlating of the collected data. The TDOA method can realize the localization on every range gate of referenced receiving antenna. Futher the kalman smoothing filter is adopted to obtain a more accurate localization result by constructing target moving model. Simulation results show that the algorithm can get satisfacting space localization accuracy.
    8  SAR Imaging Algorithm Based on Least-squares Error NUFFT''s
    ZHANG Zhi-yu RONG Zhu
    2007, 29(11):29.
    [Abstract](2634) [HTML](0) [PDF 0.00 Byte](41)
    Abstract:
    In SAR imaging, Range Migration Algorithm (RMA) can be implemented effectively under the condition of the big area and low frequency, especially in UWB-SAR imaging. However, RMA must include the so-called stolt interpolation, which will cause the huge amount of calculation. In this paper, NUFFT will be applied in RMA, and our approach consists in substituting both the stolt interpolation and the final range inverse FFT by a single NUFFT, wipe off skillfully vast calculation arised from stolt interpolation. Numerical simulations illustrate the performance of the new method.
    9  Modeling and Analysis of Radar Network System Based on Extended Petri Net
    LU Shan-shan SHAO Xi-jun
    2007, 29(11):32-36.
    [Abstract](2559) [HTML](0) [PDF 0.00 Byte](22)
    Abstract:
    First, an extended petri net based model of radar network system was proposed. By analyzing the structure of the model, not only the problem of synchronization between radars was solved, but also the way to avoid conflicts in the system was presented. Then extend Petri net was combined with queuing theory to describe some statistical performance of the system quantitatively. Finally, a simulation experiment was carried out by using the proposed model. Consequently, extended petri net was a powerful tool to model and analyze radar network system, especially in structure optimization and effectiveness assessment.
    10  Detection of Chirp Signal with Time-varying Amplitude Using the FRFT
    NIU Hong QI Lin SONG Jia-you
    2007, 29(11):37.
    [Abstract](2641) [HTML](0) [PDF 0.00 Byte](5)
    Abstract:
    The detection and parameter estimation of the time-varying amplitude chirp signals is focused in this dissertation, the detection method using the Fractional Fourier Transform(FRFT) was studied theoretically and the simulating analysis about the properties of the detect method is provided.
    11  A Novel Dimensional Imaging Method of High Speed Radar Target
    CHEN Fu-bin SHI Zhi-guang ZHAI Qing-lin FU Qiang
    2007, 29(11):40-43.
    [Abstract](2826) [HTML](0) [PDF 0.00 Byte](17)
    Abstract:
    On the analysis of one dimensional imaging question when using step frequency radar, we give a novel imaging method. Firstly, the velocity of targets was estimated based on the fractional fourier transform. Secondly, the velocity effects was compensated by the estimated parameters. Lastly, we use the improved rotation shift sticking method to obtain the panoramic range profile in the range gate. The simulation result shows we can get better range profile under lower snr and high speed using the proposed method. The method's computation burden was lower, so it has better applied value.
    12  System Error Estimation for Information Fusion of Active Radar and Passive Radar
    WANG Yan PENG Ying-ning WANG Hua-bin
    2007, 29(11):44-48.
    [Abstract](2588) [HTML](0) [PDF 0.00 Byte](8)
    Abstract:
    System error estimation for active radar and passive radar is the key for realizing high precision Information fusion of passive radar and active radar. Passive radar has different error distribution characteristics because of different location methods from active radar, and the existing methods of system error estimation for active radar network arent applicable to the radar network of active radar and passive radar. This article proposes a method for system error estimation based on observation data on the same target by passive radar and active radar. The simulation results show that the method works effectively.
    13  A Modified Range-Doppler Algorithm for De-chirped FM-CW SAR with a Squint Angle
    GENG Shu-min HUANG Fu-kan
    2007, 29(11):49-52.
    [Abstract](2551) [HTML](0) [PDF 0.00 Byte](6)
    Abstract:
    "Stop and go" manner is the basis of the signal processing and analysis of the conventional pulse SAR. For FM-CW SAR, the large PRI and the duty cycle deteriorate the aberration of the received signals. In this paper, the main error source of classical range-dopple algorithm is analyzed which cause the loss in image quality, and the modified Range-doppler algorithm adapted to large sweep cycle of the de-chirped FM-CW squint SAR is presented. The deduction and the simulation proved the signal model and the algorithm are feasible and correct.
    14  Change Detetion Algorithm Based on Wavelet Transformation
    WANG Hong-xian
    2007, 29(11):53-55.
    [Abstract](2598) [HTML](0) [PDF 0.00 Byte](4)
    Abstract:
    Change detection in muhitemporal remote sensing images is a challenge because of the illumination variation and noise. In this paper, we develop a robust change detection algorithm based on muhiscale analysis and multivariate hypothesis test. A modified wavelet transformation is used to decompose the difference image of two co-registered remote sensing images into four sub-images. The modified wavelet transformation has no down-sample procedure, and the sub-images have the same size and coordinate system with the input images. Then the four sub-images are integrated into a vector matrix, with each vector is composed of four weighted values that are at the same space position of four sub-images. The two vector matrix can be analysised under the frame of multivariate hypothesis test. Experiment results are carried out to prove its superiority.
    15  New Method of Target Detection in the Improved Sea on the ARLPM
    PENG Sui-yang LUO Peng-fei
    2007, 29(11):56-59.
    [Abstract](2408) [HTML](0) [PDF 0.00 Byte](6)
    Abstract:
    舰载(或岸基)雷达对海面小目标检测是一个重要而且困难的课题。最大极点幅度检测(ARLPM)是目前实用性较强的一种方法,特别在短时检测方面有着不错的效果。但该算法的缺陷在于只利用了海杂波AR谱的最大幅度极点的谱宽特性,文中在ARLPM的基础上提出了一种新的基于AR模型的方法——双参量检测,它同时利用到了极点的谱宽和谱峰。最后,利用真实海杂波数据对该方法作了实验,通过比较表明,双参量检测优于原方法。
    16  Research on Improved Code Book of SAR Raw Data Vector Quantization Coding
    YANG Yun-zhi HUANG Shun-ji WANG Jian-guo
    2007, 29(11):60-63.
    [Abstract](2596) [HTML](0) [PDF 0.00 Byte](20)
    Abstract:
    In this paper, we discuss the principle of vector quantization and research the code book generating method of vector quantization. Based on the code book generating method, we put forward an improved code book generating method for SAR raw data vector quantization coding. We introduce the SAR raw data compression coding application with the improved code book and get well experiment effect.
    17  Improvement of Dihedral Angle Model in UWB SAR Target Detection
    YANG Zhi-guo WANG Liang HUANG Xiao-tao ZHOU Zhi-min
    2007, 29(11):64-67.
    [Abstract](2548) [HTML](0) [PDF 0.00 Byte](6)
    Abstract:
    UWB SAR is applied to detect targets under foliage because of its penetrability. Dihedral angle model is a kind of approximative model usually used in target detection of trucks and such concealed tactics targets, which explains preferably " broadside flash'of trucks and such tactics targets. The discussions about dihedral angle model are summarized in this paper. Several problems are found in the electromagnetic: modeling of the former model through the farther analysis, and improvement is accomplished against the deficiencies of the model. Analysis and improvement of dihedral angle modeling consummate the theory of dihedral angle model, and guidance value of dihedral angle model is enhanced in target detection.
    18  Contrast Optimization Autofocus Algorithm for UWB SAR
    XUE Guo-yi ZHOU Zhi-min WANG Jian
    2007, 29(11):68-71.
    [Abstract](2612) [HTML](0) [PDF 0.00 Byte](19)
    Abstract:
    Unlike synthetic aperture radar(SAR) operating on high band, there exists very strong clutter and noise in ultra-wide Band SAR (UWB SAR) working on UHF/VHF band, which makes it difficult for the application of contrast optimization autofocus (COA) algorithm in UWB SAR. The strong clutter sometimes would make the image contrast cannot really reflect whether targets focus or not. The effects of the COA algorithm are decided by minishing the interference of clutter somewhat. In this paper, some techniques are used to overcome the disadvantages of strong clutters and the results of real UWB SAR data show the validity of the improved COA.
    19  Scan Performance of Four Horns Mono-pulse Antenna Improved by Multibeam Antenna
    LIN Yan
    2007, 29(11):72-74.
    [Abstract](2580) [HTML](0) [PDF 0.00 Byte](22)
    Abstract:
    提出了四喇叭单脉冲抛物面天线和多波束抛物面天线共用一个抛物面来提高四喇叭单脉冲抛物面天线的搜索性能。计算了个实例,该多波束抛物面天线的波束扫描角达22.78°、口径直径为53.33λ(λ=0.03 m)、馈源方向图为cosθ、增益比原四喇叭和波束下降4 dB左右。
    20  Nonlinear Active Antenna Array Based on Coupled Oscillators
    TANG Zhi-kai JIANG Yong-hua LIU Long-he LING Xiang
    2007, 29(11):75-79.
    [Abstract](2723) [HTML](0) [PDF 0.00 Byte](20)
    Abstract:
    Phased array can be made high efficiency, low cost, smaller, if active integrated antenna array's beam-scan-ning are realized by coupled oscillators. The article analyses an oscillator array with an arbitrary coupling network by Y-parameters, a set of differential equations for the oscillator amplitude and phase dynamics is proposed, then a novel phase-shiftless beam scanning method for active integrated antenna array is put forward according to the application, and the stability of the method is studied. The usefulness are illustrated through computer simulations.
    21  Microstrip Dipoles Antenna Arrays in Millimeter Waves
    YIN Xiao-xing ZHU Huai-cheng ZHENG Li-zhao WENG Cheng-xiang SUN Zhong-liang
    2007, 29(11):80.
    [Abstract](2582) [HTML](0) [PDF 0.00 Byte](21)
    Abstract:
    介绍了一种毫米波微带双面偶极子天线线阵。在单元天线设计的基础上,对相邻天线单元互耦的影响进行了仿真分析,然后根据实际测试结果,对相邻天线单元互耦的影响进行了分析。实测结果表明,该天线阵列具有较好的驻波和互耦性能,适合用于相控阵系统。
    22  Research on Visualization for Antenna Structural Optimization Based on Parallel Coordinates
    YOU Fang QIU Yuan-ying CAO Hong-jun DUAN Bao-yan
    2007, 29(11):83-85.
    [Abstract](2425) [HTML](0) [PDF 0.00 Byte](16)
    Abstract:
    In this paper, visualization technology is introduced to optimization computing process for antenna structures. To overcome the difficulty that the Cartesian coordinate system cannot describe the multidimensional data space, a new powerful visualization tool, namely parallel coordinates visualization technology, is apphed to display interrelated information of design space, such as the information of gradient and restriction function. Then, optimization computing process is made transparent and visible. Thus, the optimization process can be tracked and manipulated and the efficiency and quality of optimization are enhanced to a certain extent.
    23  Drift of 2D Scanning Beam Pointing for Plane Phased Array Antenna
    SHU Xian-rong SUN Lei LI Di
    2007, 29(11):86-88.
    [Abstract](2576) [HTML](0) [PDF 0.00 Byte](14)
    Abstract:
    揭示了平面相控阵天线宽带工作时,两维扫描波束指向漂移的规律。理论分析表明:在球坐标系下,φ方向不发生漂移,θ方向的漂移与直线相控阵天线一维扫描时相同。全空域立体扫描波瓣的仿真验证了上述结论。文章也给出了阵列单元或子阵设置数字延迟器后,扫描波束指向漂移改善的分析结果。
    24  1 056 MHz Temperature Compensation Inverted Mesa Crystal Oscillator
    YU Xiao-ting LEI Zhen-huan
    2007, 29(11):89-90.
    [Abstract](2628) [HTML](0) [PDF 0.00 Byte](9)
    Abstract:
    Introduces 1056 MHz temperature compensation oscillator, with third overtone mode 264 MHz inverted mesa crystal resonator. Because improved quartz crystal thinning technology, raised the frequency of quartz crystal resonator, and improved performance of quartz oscillator.
    25  Optimized Design of Channelized Reconnaissance Receiver
    ZHANG Xiao-fa LIANG Rui-hai YUAN Nai-chang
    2007, 29(11):91-93.
    [Abstract](2576) [HTML](0) [PDF 0.00 Byte](5)
    Abstract:
    The false responses due to the nonlinearity of the microwave circuits reduce the dynamic range of the channelized reconnaissance receiver. In this paper, the mechanism of the false responses and the frequency and amplitude characteristics of them are analyzed. And based on the auto-measurement of the high order nonlinear parameters of the microwave mixers, the parameters of the receiver are optimized. A channelized receiver is designed, which has a dynamic range of more than 90 dB.
    26  Correlated Clutter of Extended K-distribution and its Simulation Analysis
    HU Luo-quan YU Han ZHU Hong-bo
    2007, 29(11):94-98.
    [Abstract](2652) [HTML](0) [PDF 0.00 Byte](12)
    Abstract:
    In order to model the probability density function (pdf) of radar clutter, which has some non-gaussian features, i.e., peak, asymmetry and heavy tail, the extended K-distribution random variables are obtained through multiplying the product of two independent rayleigh variables by generalized X~2 distribution random variable with n degrees of freedom. This pdf of extended K-distribution has more significant peak and heavier tail than that of previous K-distribution with the help of the product of two independent Rayleigh variables, whose effect corresponds well with the scattering mechanism of clutter of high resolution radar. Besides, the model of Markov diffusion process is used to generate correlated random variables of the extended K-distribution. The simulation results of the above pdf correspond well with the theoretical value.
    27  Analysis of Stress and Strain on Radar Antenna Based on Wind Loads
    HUANG Qiong-qiong QIN Xian-zhu HUANG Hong-yan
    2007, 29(11):99-102.
    [Abstract](2680) [HTML](0) [PDF 0.00 Byte](38)
    Abstract:
    The antenna is widely applied in domains such as correspondence, radar navigation and so on, and the statics/ dynamics characteristic to the antenna structure has extremely important influence on the antenna electricity/machine performance. Also paraboloid antenna mouth face area is bigger and in a bad work environment, so Wind load becomes the mainest load affect the regular work of antenna. In this paper, the analysis of stress and strain on radar antenna equipment based on wind loads is discussed in detail, using finite element method, and corresponding resultant contours are plotted. And which can provide scientific conclusions and design basis for antenna working in a optimizing state.

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