Issue 12,2015 Table of Contents

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  • 1  Development Trend of Airborne Early Warning System Technology
    LU Jun ZHANG Zhao HU Ruixian
    2015(12):1-5.
    [Abstract](2462) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    The airborne early warning system (AEWS) is an essential part of the airborne information system. The three requirements are analysed respectively of stealth targets detection, target comprehensive recognition and complex battlefield confrontation, and then, the technology trend of AEWS is proposed in future.
    2  Review and Prospect of Airborne Early Warning Radar Development
    CAO Chen
    2015(12):6-10.
    [Abstract](2730) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Development is reviewed of airborne early warning system for 70 years since 1945 in this paper, and its course is compartmentalized three generations based on mission-adaptability, environment-adaptability and platform-adaptability. Then, according to the military requirement, technology characteristics are expatiated for airborne early warning radar in the future, such as wide-band, integration, intelligence and network. In general, airborne early warning radar will improve the adaptability of mission, environment and platform, its concept will be extended and its effect will be important in kill chain. Airborne early warning radar will be more deeply integrated into other systems such as communication, IFF and ECM et al, for more distribution to operation based on information system.
    3  A Study on the Evolution Way of the System Architecture of AEW Radar
    ZHANG Liang ZHU Huan WU Tao
    2015(12):11-18.
    [Abstract](2341) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    The system architecture and signal processing technology of airborne early-warning (AEW) radar promote each other and evolve generation by generation. The driving force of the signal processing evolution comes from the requirement of the system and the guideline in the building of system architecture is to achieve the core processing ability optimally. In this paper, the characteristics of AEW radar's clutter spectrum in the space-frequency domain and space-range-frequency domain are analyzed firstly. Then, the evolution history of two generation architecture-PD and STAP is summarized. At last, based on the clutter and interference rejection problem AEW radar facing, three possible evolution ways of AEW radar's system architecture in the future are proposed.
    4  Development Trend and Key Technology of Airborne Early-warning Radar Antenna
    GUO Xiansong KONG Lingbing LIU Xiaofei
    2015(12):19-24.
    [Abstract](2456) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    A trend for next generation airborne early warning radar is multi-function integrated detection. The antenna array is required to have the characteristic of multi-function and integration with the platform, and meanwhile realize the ultra-wideband and multiple frequency band performance. The hardware supporting the digital intelligent radar scheme is also required. Firstly, the development trend and current status is introduced of the airborne early warning radar antenna in the world-wide. Then the key technology of the airborne early warning radar antenna is analyzed. Finally, the technical routes and core issues are illustrated and partially the solution methods are proposed.
    5  SNR Estimation Based on the Periodic Ambiguity Function Theory
    LIU Jing BEN De ZHOU Xingang
    2015(12):25-28.
    [Abstract](2494) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Periodic ambiguity function is related to the time delay and frequency offset plane of a periodic modulation continuous wave, and different signals have different periodic ambiguity functions. To estimate the signal to noise ratio (SNR) of intermediate frequency signal, a method based on periodic ambiguity function was proposed. According to the different ambiguity function performance of signal and noise, the SNR estimation formula based on the periodic ambiguity function on the condition of Gauss white noise was derived, and the algorithm was given. In the end, the simulation was analyzed to compare with other methods. The results show that the accuracy of SNR estimation method based on the periodic ambiguity function is very high, especially for the condition of low SNR, and the algorithm is simple and easy to carry out.
    6  Super-resolution Scattering Centers Estimation Based on Compressed Sensing
    JIN Benzhou WU Gang
    2015(12):29-33.
    [Abstract](2684) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Due to the requirement for feature extraction of scattering centers in radar target recognition, a method of super-resolution scattering center parameters estimation based on compressed sensing is proposed. By designing a dictionary, pulse compression signal is sparsely represented in this paper and then the CS framework is used to the reconstruction problem. Based on the simulation method, the correctness of our proposed scheme is verified. Through filtering a signal with 80 MHz bandwidth into a 20 MHz narrow-band signal, the super-resolution scattering centers are reconstructed by the 20 MHz signal and then wideband pulse compressed signal is recovered. Results show that the proposed algorithm is feasible to reconstruct scattering centers with an acceptable error.
    7  An Improved Method of Doppler Weather Radar Spectral Moment Estimation Based on Whitening Filter
    LI Xuehua HE Jianxin SHI Chao ZENG Qiangyu ZHANG Fugui
    2015(12):34-39.
    [Abstract](2530) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    An improved method of spectral moment estimation based on range oversampling and whitening filter is developed to aim at the data-quality problems of echo intensity and velocity, which the operation accuracy need of 1 dB and 1 m/ s could not be met under the enhancement of Doppler weather radar azimuthal and time resolution. In this method, the range sampling-frequency is adopted to increase to acquire more numbers of radar echo signal, and the whitening filter is used to remove the range sampling-time correlation and increase the equivalent number of independent samples. Based on the whitened range oversampling echo signal, the algorithm of pulse pair processing is improved to enhance the accuracy of estimation. Simulation and experimental results indicate that the accuracy decrease can be remedied through these methods during the processing of azimuthal and time resolution under higher signal-to-noise and the accuracy need of radar operation application can be met.
    8  A Study on Radar Mainlobe Jamming Suppression Based on Blind Source Separation of Fast ICA
    WANG Wentao ZHOU Qingsong LIU Xinghua LI Lei
    2015(12):40-44.
    [Abstract](2556) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    If the suppress jamming pour into the mainlobe of radar antenna, it would severely degenerate the performance of radar. The common ECCM measures of sidelobe have no effect. In this paper, the signal model of mainlobe jamming suppression based on Fast ICA blind source separation algorithm is given first of all. Then the blind source separation algorithm of fast independent component analysis (ICA) based on kurtosis in the uniform noise environment is used to separate the high SNR composite signal which is interference and target signal mixed. And the target signal is found out by applying the pulse compression technique between the transmitted target signal and the separated signal at last. Then some simulation experiment is finished to test the validity and to evaluate the performance of the mainlobe jamming suppression algorithm. The simulation results show the satisfactory validity of algorithm in the radar mainlobe jamming suppression and evident superiority in the efficiency of the separation.
    9  A Method of Analyzing the Echo Characteristic of OTHR Based on the Original Spectrum
    YU Chengang CHEN Zhijian
    2015(12):45-48.
    [Abstract](2540) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    The work environment of the sky-wave over-the-horizon radar (OTHR) is complex, so the echo characteristic is also very complex. In order to distinguish the targets and track them effectively, it's the first to hold the target characteristic. So a valid method of analyzing the echo characteristic of the OTHR based on the original spectrum is proposed, and it can analyze the plot data, track data and the spectrum data synchronously, evaluate the fundus of the noise, the width of the clutter, and the covering rate. Thereby, we can hold the echo characteristic of OTHR effectively and validate the tracking process.
    10  A Study on Off-Grid Problem for Distributed MIMO Imaging Radar Based on Compressive Sensing
    ZHANG Hailong LU Guanghua YU Hui WANG Dongjin
    2015(12):49-53.
    [Abstract](2419) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    In distributed MIMO radar system based on compressive sensing, if the imaging target is not positioned at the pre-discretized grid locations, that is to say, there exists Off-Grid deviation in the system, the imaging results will be deteriorated sharply.In order to solve this problem, an effective solution under one order and two order approximation of Off-Grid deviation respectively is proposed in this paper. The echo model when there exists Off-Grid deviation in the system is established first and then, based on the ideal discretized grid, the perturbation model is established by regarding the Off-Grid deviation as unknown and carrying out one order and two order Taylor expansion of it. After that, the influence of Off-Grid deviation on imaging result is analysed. Finally, the algorithm based on FOCUSS and CTLS is proposed to jointly estimate the target location and its scattering coefficient. Compared with the traditional imaging method based on compressive sensing, the algorithm proposed in this paper can solve the Off-Grid problem effectively and improve the inversion accuracy of target recovery. The effectiveness of the proposed algorithm is confirmed by several experimental results.
    11  A Study on the Parameter of Wall Based on Sparse Spilke Inversion
    FEI Xiangyu FENG Wenya WANG Chenghao
    2015(12):54-56.
    [Abstract](2505) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    The sparse reflectivity can be estimated from the noisy A-scan by sparse spike inversion. This paper is used L1 norm constrained method, and this method is optimized by Iteratively reweighted least squares (IRLS) which is high in terms of resolution and fast. The resolution can be improved obviously and the reflectivity can be obtained after processed the data of through wall detecting radar used this algorithm, then the thickness and dielectric constant can be obtained. The different experimental result is presented to illustrate the effectiveness of the algorithm at last.
    12  System Identify Applied in Dynamic Characteristics Testing for Servo Control System
    ZHU Yanmei HOU Wen ZHENG Haoxin ZHANG Yin
    2015(12):57-60.
    [Abstract](2731) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    System identification is introduced into servo system testing and MISG is used to calculate the transfer function of the system. Step response characteristic and frequency response of the system are calculated through the transfer function which are obtained by system identification, which not only decreases testing items but also improves testing efficiency. A test experiment was completed on the test requirement for an actuator. Compared with the traditional testing method, the experimental results show that the error of amplitude-frequency characteristic kept within 0. 39 dB and the error of phase-frequency characteristic kept within 4. 9°and the rising time was kept within 6. 29% . Test effect is given excellent results through performance indexes of servo system obtained by system identification.
    13  Design of an Ultra-wideband All-metal Vivaldi Antenna
    CHEN Jin HU Mingchun ZHANG Jinping LI Xiaoqiu
    2015(12):61-64.
    [Abstract](2526) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    An all-metal Vivalidi antenna operating at the bandwidth of 3 ~17 GHz is proposed and its VSWR is less than 2 over the UWR band. The bandwidth can be up to 11 GHz in the case of broadside scan. The traditional Vivaldi antenna has the problems of high cost、low physical strength and complex structure, this all-metal Vivaldi antenna can solve those problems and this design is ideal for high-power applications. By using high frequency structure simulation software HFSS, the structure is optimized, simulations and analysis are presented for the all-metal Vivaldi array element in single polarization configuration, by computing the VSWR, radiation pattern and the gain, we can see its characteristics of ultra-wideband and broadside scan.
    14  Influence and Analysis of Test Antenna on Radome Transmission Efficiency
    WANG Yunxiang XU Qun LIU Shangji QIAO Chenxiao
    2015(12):65-69.
    [Abstract](2580) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    During test for radome electrical performance,test antenna is needed. The type,polarization and aperture size of test antenna have certain influence on radome electrical performance. Completed a simulation calculation of influence degree on radome electrical performance caused by test antenna aperture size, verified by contrast test. Calculation and test results show that the test antenna aperture size has little influence on radome transmission efficiency as the difference between test antenna and airborne antenna is little. In engineering practice ,when there is not airborne antenna,we can use anthother antenna which has the same type, same polarization and similar size to airborne antenna to test transmission efficiency.
    15  Design of High-power Plateau Type Transmitter
    WANG Dengfeng
    2015(12):70-73.
    [Abstract](2313) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Combined with the research on the plateau type radar transmitter, the design of a high-power klystron transmitter which worked on 5 000 m plateau is introduced. The block scheme of the transmitter is presented. The emphasis is placed on the solid state modulator, high-voltage insulation technology, fast arc protection circuit and the protection on klystron arcing. The transmitter has the characteristics of small volume, high efficiency and good maintainability. The practice shows that the enviromental flexibility and reliability of the transmitter can meet design index.
    16  Frequency-agile Coherent Radar Receiver Design and MTI Method
    ZHANG Chenlu GONG Xuhua LIU Yiming
    2015(12):74-77.
    [Abstract](2576) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    With the development of modern radar system, frequency-agile coherent (FAC) radar becomes increasingly attractive for its advantages in target imaging and electromagnetic counter-countermeasures. Three structures of FAC radar receiver are introduced; their principles and applying situations are analyzed. A clutter suppression method based on best output single-to-clutter ratio filter is proposed, which can implement moving target indication (MTI). Field experiments using FAC radar prototype are made to demonstrate coherent and MTI performance according to analyzed experimental data.
    17  Technology Study on Furnace Brazing of Brass Alloy Precision Waveguide
    LIU Hongbin
    2015(12):78-82.
    [Abstract](2414) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    In order to meet the requirement of joining the waveguide of feeder system, technology of flame brazing and soldering were studied. By analysising the results of experiments using the technical parameter determined in this paper, the quality problem that the waveguide was black in some area was solved. Improved technology of brazing and soldering the waveguides can meet the needs of design.
    18  Detection Method for Ground Slow Moving Targets by Airborne SAR
    YANG Yuelun
    2015(12):83-87.
    [Abstract](2605) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    In airborne SAR moving target detection, ground slow moving target's speed is small, so it's easy to be submerged by ground strong main lobe clutter and undetectable. In this paper, according to the characteristics of the movement of ground slow moving targets, a DPCA-CFAR joint detection method based on Frft is proposed. After using DPCA to achieve clutter suppression, CFAR processing is made to detect the moving targets. And according to the signal amplitude after DPCA and CFAR detection threshold, the minimum detectable velocity is inferred to show the performance of this proposed algorithm for slow moving targets detection. Further Frft is used to estimate the target speed. Finally the effectiveness of the algorithm is verified by simulation.
    19  Radar Display Software Design Based on Plug-in Unit Integration Technology
    YANG Xiaoyan XU Huimin SHI Sanjiang
    2015(12):88-92.
    [Abstract](2477) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    The trend of modern integrated warfare is changing rapidly, the demand for the information security of various types of sensors is becoming higher and higher. The terminal display software as the window of the interaction between the radar information and the operation needs to be able to react quickly to different operational tasks, and the function can be reconstructed. Based on the operational requirements, this article puts forward a kind of software design method based on QT, which is based on plug-in integration. This software design technology is applied to a certain type of ship borne radar display terminal, which can satisfy the system's flexibility, high efficiency and expansibility. It has high practical significance and popularization value.

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