Issue 2,2012 Table of Contents

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  • 1  Overview of Radar Technology Development and Initial Study on the 5th Generation of Rad
    GUO Jian-ming TAN Huai-ying
    2012, 34(2):1-3.
    [Abstract](2404) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Radar system, theory and technology are continuously developed under the requirement of diverse target, complicated environment and multiple mission. The evolution of radar is analyzed from three aspects of detector composition, observation angle coverage and signal subspace dimension, and the developing tendency of the 5th generation of radar in the next 20 years is presented, which is networked, cooperative and intelligent. The multiple-input multiple-output (MIMO) radar, cognitive radar and gazing radar are studied respectively, which are typical system of the 5th generation of radar. This paper is of great significance to guide radar development.
    2  A Study on Airborne MIMO-SAR Linear Array Antenna Configuration
    LI Yun-tao CHEN Yong-guang DENG Yun-kai YIN Can-bin
    2012, 34(2):4-7.
    [Abstract](2376) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    The application of the effective phase center (EPC) principle provides a more freedom of degree for antenna configuration of multi-input multi-output SAR(MIMO-SAR). EPC principle is expatiated. Traditional ARTINO antenna configuration is analyzed. The transmitting elements are violent vibrating for locating at the wing tips, which blurs the image. Then, antenna array is ameliorated for the traditional ARTINO. Center-transmitter collocated model and center-receiver collocated model are put forward. Finally, antenna pattern of the above models is simulated. The simulation results indicated that MIMO SAR antenna configuration design using EPC principle could ensure the favorable pattern directionality, and improve the design flexibility of the antenna geometry and reducing cost.
    3  Ionosphere Effects on the Rang Performance of P-band Spaceborne SAR Signal
    MENG Zhe LIU Guang-yan
    2012, 34(2):8-11.
    [Abstract](2362) [HTML](0) [PDF 0.00 Byte](1)
    Abstract:
    The P-band spaceborne SAR system with penetrating capabilityies is recognised, but there are superior influences on the electromagnetic wave transmission because of the ionospheric free electrons. The range deviations of the SAR image are analysed in this paper, which are brought by a spation-temporal change of the electron density, the ionosphere model applied to engineering is used in the analysis. At the same time, a range resolution is deteriorated by the ionospheric dispersion which causes the compressed pulse broadening. The simulation results provides the basis on the P-band spaceborne SAR system design.
    4  Application of Target Detection Based on Fractal Theories
    LIU Ning-bo GUAN Jian SONG Jie WANG Guo-qing HE You
    2012, 34(2):12-18.
    [Abstract](2387) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    This paper is an overview of the history mainly about the application of fractal theory in the field of radar target detection. First, the deficiency of the traditional radar target detection is analysed. Then, the development of the fractal theory in the field of target detection is presented based on the fractal model going from the easy to the difficult, and the focal points are placed on the aspects of routine radar target detection and image target detection(SAR image). Finally, the researching prospect of applying fractal theory to target detection is presented.
    5  Analysis of the Detection Performance of Non-coherent Integration Network Radar to Swerling I Targets
    XU Long-hai LIU Yue-ping GAO Xiao-feng WANG Hua-zhong
    2012, 34(2):19-23.
    [Abstract](2397) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Network Radar realizes the integration of the radar and radar countermeasures; it is a new trend of radar and radar countermeasures system. The research about non-coherent Integration Network Radar who is one of the most important kinds of pulse integration network radar is very important. And radar detection performance based on different target models is necessary if someone wants to find out the performance of radar generally and profoundly. At first, it introduces MIMO model and MW model of the noncoherent Integration network radar models according as the different ways of information processing; then some relevant formulas are deduced. In succession, it probes into how to analyze the detection performance of the MIMO model and MW model of network radar models to SWⅠtargets when the total power of single pulse of the transmitters is definite. Through the simulations of the detection performance of these network radar models, the results show that the MIMO model and MW model of network radar models have different detection performance to the SWⅠtargets and they are very significant to solve the question how to select the network radar model.
    6  A Study on Clutter Suppression for Airborne Fire-control Radar
    TU Ya-lan
    2012, 34(2):24-27.
    [Abstract](2380) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Sum and difference channels STAP for Airborne fire-control radar are studied in this paper. The clutter statistics have a dependence on range in practice, which is called non-stationary clutter and will degrade the performance of ΣΔ-3DT. In this paper we propose power selecting training method for non-stationary clutter estimation. Experimental results show this scheme can improve clutter estimation and suppression performance, while this algorithm may improve ground moving targets detection performances. The radial velocity esimation and azimuth location for targets are also discussed. This would create certain conditions for airborne fire-control radar ground moving targets.
    7  Implementation of Frequency and Angle Measurements of L-shaped Array Antenna
    TAN Jun-feng WANG Jian-tao YAN Xiao-peng
    2012, 34(2):28-32.
    [Abstract](2452) [HTML](0) [PDF 0.00 Byte](1)
    Abstract:
    The implementation scheme of frequency and angle measurements of L-array based on the designed FPGA+DSP system is studied in this paper. The peak searching MUSIC algorithm and the unitary transformation root MUSIC algorithm are both implemented in DSP with real data, and the processing results show that the time of unitary transformation root MUSIC algorithm is faster than that of peak searching MUSIC algorithm by 62. 6£¥ at the same precision level. The unitary transformation root MUSIC algorithm can also find the wideband signal in the experimentation, which has better robustness of engineering.
    8  A Study on the Maneuvering Target Detection of Airborne Radar
    WANG Dong-mei LI Hai WU Ren-biao
    2012, 34(2):33-36.
    [Abstract](2331) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    With the rapid development of modern military electronics technology, the attracking targets are highly maneuverable. The target with highly maneuverability is hard to be detected employing the conventional STAP for time-varying target Doppler frequency. In this paper, a method of maneuvering target detection based on the modified optimal processor is presented. The method applies the modified steering vector in compensating Doppler migration, which can detect the target with Doppler migration efficiently. Simulation results demonstrate that this method can enhance the maneuvering target detection capability of airborne radar.
    9  Compensatory Algorithm of Flat in GPS Area-mapping Deceiving Unites Battlefied Navigation Integrative System
    ZHANG Song YANG Jing-shu MIAO Miao WANG Li-qiang
    2012, 34(2):37-40.
    [Abstract](2374) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    The error of the transmitters'position was the primary influence in navigation of the GPS AMBN (area-mapping deceiving unites battlefield navigation integrative system). The navigation error which was brought by the flat error and the time delay was studied firstly. Then, the compensatory algorithm of flat error was proposed. The error of the transmitters忆position was equivalent to the time-delay error of the transmitters'signal. The receiver could compensate the time delay in the navigation calculation. The precision of navigation could heighten by this way. In the end, the validity of the Algorithmic was validated by the simulate results.
    10  Application of FastICA Algorithm in the Fast-scanning Radar
    MENG Qiu-chi ZHANG Zi-liang LIU Guo-qing
    2012, 34(2):41-45.
    [Abstract](2412) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    To Modern Doppler radar, calculation accuracy of the data depends on the number of independent samples, the more independent samples the more accurate in the calculation. In order to enhance the accuracy and improve the speed of radar scanning, in this paper, independent component analysis technique is used to increase the number of independent samples. ICA algorithm is on the basis of kurtosis,maximum likelihood estimation or other mathematical methods. It estimates separating matrix gradually through the iterative approximation so that the independent factors can be achieved. Among those algorithm, fast fixed-point algorithm can improve the speed of calculating by online learning and enhance its reliability. In this paper, a fast fixed point algorithm based on the maximum likelihood estimation algorithm is applied to rayleigh signals and simulative radar signals respectively and the results are compared with principal component analysis which is commonly used. The results of the texts prove a good performance of ICA which fully verifys that ICA techniques could more accurately estimate independent signal from the mixed-signal, greatly increasing the number of independent samples to reduce the spectral estimation errors. This has laid the foundation for the practical application of Doppler radar signal processing.
    11  A Study on Wideband Dechirped Radar with Long Range Gate
    WANG Xin HAO Ming TIAN Si-rui
    2012, 34(2):46-50.
    [Abstract](2422) [HTML](0) [PDF 0.00 Byte](1)
    Abstract:
    The wide-band radar with dechirp pulse compression usually applies mismatch weighting to reduce sidelobe level. However, while range gate is being longer, the performance of the traditional weight function is reducing remarkably. In this paper, theoretical analysis and simulation, it is analyzed the reason that the long range gate lead to the dechirp traditional weighted performance decrease. Meanwhile, the segment weighting method and the weighting method with RVP offset are presented, which effectively raise the performance of the weight function with long range gate. The theoretical analysis and the effectivity are proved by the simulation and the experimental data results and the practicability of the proposed method is also verified.
    12  A Study on Twinkle Jamming Project Against the Adaptive Sidelobe Canceling System
    LI Sen LI Yan-zhi ZHANG Guo-yi GUO Yu-kun
    2012, 34(2):51-54.
    [Abstract](2411) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Adaptive sidelobe canceling(ASLC) is widely used in the modern Radars to against active jamming,ASLC reduced the jamming power from the sidelobe of radar,which makes the jamming power cannot encumber the radar seriously. By means of the introduction of the basic principle of adaptive sidelobe canceling, the twinkle jamming method was proposed in this paper and analysed the effect of this jamming way, then gived a simulation of twinkle jamming in this paper,the result proved the feasibility of the twinkle jamming,gived a workable plan for jam the ASLC system.
    13  A Novel Method to Improve the VSWR Bandwidth of Waveguide Slot Array Antenna
    GAO Zhi-guo XU Guo-bing
    2012, 34(2):55-57.
    [Abstract](2410) [HTML](0) [PDF 0.00 Byte](1)
    Abstract:
    The frequency characteristic of the admittance of radiation slot and the impedance of coupling slot is the main factor that influences the bandwidth of the slot array antenna. Based on the idea of improving the frequency characteristic of the whole array, a novel method of improving the VSWR bandwidth of the slot array antenna is presented in the paper,which selects a suitable admittance constant to reduce the influences of frequency. The simulation analysis has indicated that the VSWR bandwidth of the changed slot array has been improved,and it is consistent with the result of the theory. The result of this paper brings forward a new idea for improving the VSWR bandwidth of the slot array antenna.
    14  Design of Large Inertia Radar Antenna's Driving System and Transmission Chain
    ZHANG La-mei
    2012, 34(2):58-61.
    [Abstract](2318) [HTML](0) [PDF 0.00 Byte](1)
    Abstract:
    It adopts the AC servo motor to be the drive component, the thought of which has changed the tradition designing style of adopting DC servo motor. Double-motor drive can reduce the system failure rate greatly and raise the drive system's MTBF. It adopts swell cover device in many places, which can improve effect in dismantling and assembling. At the same time, it is convenient to defend the system. The drive system is developed to have features of light weight, small volume, convenience in assembling and high-tracking accuracy. The choice of tracking radar antenna's drive system has been introduced systematically and the design procedures of transmission chain and accuracy analysis has been introduced especially in the article.
    15  Conformal Thinned Spherical Arrays of Low Sidelobe with Randomly Spaced Element
    ZHAO Fei CHENG Nai-ping
    2012, 34(2):62-64.
    [Abstract](2367) [HTML](0) [PDF 0.00 Byte](1)
    Abstract:
    The radiation problem of planar arrays which have narrow scan range and low angular resolution with conformal spherical arrays correspondingly are compared. It turns out to be important that it thins the conformal spherical arrays using uniform random arranged element and also realizes the compromise between high angular resolution and low cost.
    16  Analysis of GNSS Receiver's Tracking Loop Architecture and Characteristic
    MU Tu-sen DU Heng YANG Guo-wei ZHANG Jia-lin
    2012, 34(2):65-70.
    [Abstract](2384) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    The standard (scalar)tracking loop estimator-based tracking loop vector-based tracking loop INS-aidedtracking loop and INS-aided reconfigurable tracking loop of GNSS receiver are analyzed. A type of VDFLL implementation is described. We should use different tracking loop in different apply make the GNSS receiver more cost-effective.
    17  Design and Analysis of Driver and Circuit Transferring Pulse of Set Pulse-width (the middle part)
    WEI Zhi
    2012, 34(2):71-76.
    [Abstract](2469) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    First of all, the paper deeply discusses and analyzes driving circuit composing of 160 IGBT serial switch modulators according to the analysis of working state and requirements of IGBT grid driving characteristics discussed in the paper of the front part. Then, the paper comprehensively and systematically introduces engineering design method of current transformer type driver with set pulse-width, brings forward calculating formula of practical circuit parameters, presents design rules of working state of driver influenced by Miler capacitor Cm, and concludes 2 calculating method of segmental design of driving voltage U_GE front edge τ_r. In the end, the paper introduces practical circuits of 2 kinds of bipolar pulse driver and parameter calculating method of RC accelerating network.
    18  Missile Target Recognition Algorithm of Neural Networks Based on Wavelet Packet Decomposition
    ZHANG Rong-jie ZHANG Shuai-qin ZHANG Shen-tao
    2012, 34(2):77-80.
    [Abstract](2496) [HTML](0) [PDF 0.00 Byte](1)
    Abstract:
    Missile target recognition algorithm of neural networks based on wavelet packet decomposition is presented. Firstly, stable feature is obtained by wavelet packet decomposition which can reflect the time-frequency information of time serials. Secondly, the feature which represents some target is identified by the trained neural networks. This algorithm is tested using artificial data and real data. The result indicates upper recognition probability.
    19  Review of Manufacturing Process Simulation Analysis to Critical Parts in Radar Products
    BEN Ke-cun LI Bo ZANG Xiao-jun
    2012, 34(2):81-86.
    [Abstract](2296) [HTML](0) [PDF 0.00 Byte](1)
    Abstract:
    The quality of manufacturing process planning plays an important role in insuring the excellent structural and electrical behavior of radar products. To resolve such problems as low efficiency, high consumption, etc, in traditional methods, the digital simulation technology are introduced in the research on manufacturing process of critical parts in radar products. Based on the analysis of characteristic of structure, materials and manufacturing process of critical parts in radar products, firstly, the technical basis of manufacturing process simulation analysis is introduced. Then, the application of digital simulation technology in such process planning procedures as NC machining, welding and heat treatment, precision forming, composite material analysis, assembly, etc, is reviewed. Finally, the application of some emerging digital simulation technologies in the field is prospected.

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