Issue 11,2018 Table of Contents

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  • 1  Calculation Method of the EWR's Early Capturing Capability Index
    TAI Wenxing DING Jianjiang LIU Yuchi
    2018, 40(11):1-8.
    [Abstract](2844) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    To effectively and rapidly calculate the early capturing capability of the early warning radar (EWR) , this article firstly demonstrated and selected capturing height and resources occupation rate as two core evaluation index. And then the calculation methods and models for the situations with and without guidance were put forward and performed through living examples. The results showed that the proposed evaluation index and calculation methods could effectively measure the EWR's early capturing capability in the given scenario and provide important support for the operation planning of the EWR and the missile defense early warning systems.
    2  Lightweight Strategy of Complicated Electronic Equipment Based on System Engineering
    WANG Changwu HU Changming
    2018, 40(11):9-13.
    [Abstract](2781) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Electronic equipment is a complex comprehensive product involving mechanical, electrical, thermal, control, and magnetic disciplines. Its lightweight is a system engineering. Based on the system engineering concept and combined with many years of light weight electronic equipment engineering practices, this paper presents the lightweight implementation strategy and implementation approach of electronic equipment from the aspects of the system function integration, equipment hardware integration, functional structure integration, digital prototype applications, light high-strength material applications and topology optimization techniques, and explores an engineering solution that is suitable for the lightweight of complex electronic equipment.
    3  Sea-based Missile Defense Architecture Model Based on DoDAF Operational Views
    HUANGFU Yijiang
    2018, 40(11):14-17.
    [Abstract](2756) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Sea-based missile defense system is visually modeled from system architecture perspective based on Department of Defense architecture framework (DoDAF) in this paper. Multiple operational views including OV-1, OV-2 are created, sea-based missile defense missions, battlefield environment, and resource exchange are abstractly described, and missile defense operation activities are visually introduced in view of operation process, status and sequence, leading to effective technical support for toplevel sea-based missile defense architecture optimization and relative equipment development.
    4  Analysis on Development Trend of Airborne Sea Surveillance Radar
    ZHOU Shangyuan
    2018, 40(11):18-20.
    [Abstract](2777) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Limited by earth curvature, airborne sea surveillance radars have the advantage of operation range for sea surface targets and flying targets at low altitude over ship-borne radars and ground based radars. Airborne sea surveillance radar experiences three development phases. It develops to two-dimension phase-scan system from completely mechanical scan system. Currently, airborne sea surveillance radar is facing three challenges: small targets detection, quality of operational intelligence and complicated electromagnetic environment. Based on these, development trends of airborne sea surveillance radars are presented in the article, i.e. improvement of detection to small targets, optimization of intelligence quality and application spread of active phased array system.
    5  Time Reversal MIMO Radar Based Real-valued MUSIC Algorithm
    LIU Mengbo HU Guoping SHI Junpeng LIU Shengli
    2018, 40(11):21-26.
    [Abstract](2806) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    To reduce the huge computational complexity caused by multiple signal classification (MUSIC) algorithm, a real-valued MUSIC algorithm is proposed for direction of arrival (DOA) estimation with time reversal multi-input multi-output (MIMO) radar. Firstly,the proposed algorithm performs the reduced-dimension processing for the echo signal of TR MIMO, reducing the computational complexity. Then, the reduced dimension covariance matrix is transformed from complex field to real field by establishing unitary transformation matrix. Finally, the real-valued covariance matrix is decomposed into noise subspace and a new cost function is derived to estimate the DOAs. Compared with the conventional MUSIC algorithm, the proposed algorithm can remove complex operations by unitary transformation, so it can reduce the computational complexity greatly. Besides, the proposed algorithm can also achieve decorrelation processing without space smoothing and array aperture loss. The simulation results verify the validity of the method.
    6  Real-time Generation Algorithm Optimization Method of Deceptive Jamming Signal for Space-borne SAR Based on Multicore DSP
    XU Kuang SUN Qingyang SHU Ting YU Wenxian
    2018, 40(11):27-30.
    [Abstract](2770) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    In this paper, a real-time generation algorithm optimization method of deceptive jamming signal for space-borne synthetic aperture radar (SAR) based on multicore DSP is proposed. Hash lookup table, dynamic/static computational separation and other techniques based on DSP hardware architecture are used in this method. The purpose of real-time generation of deceptive jamming signal for space-borne SAR is achieved, which provides a feasible optimization idea for other DSP-based algorithms. Several key problems that can affect real-time performance are analyzed in algorithm design and engineering implementation. The verification of typical SAR is carried out, and the effectiveness and real-time of the method are proved.
    7  A Study on Space-borne SAR Signal Recognition Technology Based on Support Vector Machine
    WANG Zhetao SONG Xiaoquan
    2018, 40(11):31-36.
    [Abstract](2757) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    To solve the problem of electronic countermeasure reconnaissance and identification for space-borne synthetic aperture radar (SAR) signals, a space-borne SAR signal classification method based on support vector machine is proposed. This method builds a binary tree (BT) structure based on the sample clustering, solves the multi-classification problem of support vector machine, and reduces the accumulation of classification errors of the binary tree structure. Gaussian kernel functions are used to solve nonlinear problems of samples, and genetic algorithm is used to optimize model parameters, thereby improving the classification performance of the model. In this paper, the four kinds signals of Radarsat-2 space-borne SAR satellite from Canada are classified and simulated, and compared with the traditional parameter matching method. The results show that the method in this paper has a good recognition rate, and the generalization ability of the model is also stronger, so it is helpful to solve the difficulty of reconnaissance on space-borne SAR.
    8  Cognitive ISAR Imaging Technique of Moving Targets Based on Sparse Processing
    GU Fufei LUO Ying CHEN Yijun ZHANG Qun
    2018, 40(11):37-42.
    [Abstract](2823) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Sparse processing has been utilized to reconstruct the high-dimensional sparse singal with low-dimensional data. Based on this property, sparse processing has been applied to ISAR imaging to reduce the data amount and improve imaging quality. Firstly, after analyzing the echo signal model, an ISAR imaging method based on sparse processing is introduced, and the experimental results are put forward. Then aiming at solving the low adaptive adjustment performance for target, environment and low capacity of working, sparse ISAR imaging and cognitive radar are combined, two kinds of cognitive sparse ISAR imaging schemes are presented to the situations of single target and multiple targets correspondently. Finally, the experimental data is utilized to prove the effectiveness.
    9  Effect Analysis of Channel Mismatch on STAP Performance
    HAN Xiaodong SHU Ting YU Wenxian
    2018, 40(11):43-48.
    [Abstract](2750) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Channel mismatch seriously affects performance of space-time adaptive processing (STAP), so quantitative analysis of its effect on STAP performance is significantly important for engineering application of STAP. With respect to such problem that whether channel mismatch depends on the angle of arrival (AOA) and is narrow-band or not, clutter covariance matrix (CCM) with channel mismatch is theoretically derived, and the effect of channel mismatch on performance of STAP is also analyzed. The work in this paper can provide theoretical support for STAP algorithm modeling and STAP system design.
    10  Attitude Estimation of Quadrotor Based on QEKF
    SHI Chuan LIN Da ZHANG Guo TANG Yu
    2018, 40(11):49-52.
    [Abstract](2838) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    In this paper, a quaternion extended Kalman filter (QEKF) data fusion algorithm is proposed, which is applied to the attitude estimation of quadrotor. Firstly, quaternion is used to represent the coordinate rotation relation in the attitude heading reference system (AHRS), to obtain the attitude information of quadrotor. Secondly, using the extended Kalman filter data fusion algorithm, the 9-axis original data of gyroscope, accelerometer and magnetometer sensors in MPU9250 are combined to filter out the interference noise of the sensor and track the true attitude of the quadrotor. Finally, QEKF is proved to be more accurate in estimating the attitude by comparing it with complementary filter and gradient descent in MATLAB.
    11  Study on the Microwave Properties of Parylene C Coating
    WU Liqun CUI Wenyao CHEN Xu LIU Yang
    2018, 40(11):53-56.
    [Abstract](2938) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    The amplitude and phase effects of Parylene C coatings with different thicknesses on microwave printing lines are studied. The effect of the coating on the amplitude is relatively small, and the influence of phase is slightly larger. The effect of C coating on microstrip line under 10 GHz is studied, and the loss of 10 μm coating under 5 GHz is basically unchanged. The effect of C coating on the standing wave and isolation of the power splitter under 10 GHz is also studied. The effect of C coating on the electrical performance of the delay line T/R component in 8 GHz~12 GHz is studied, and it decreases significantly after 11 GHz. The results of the study show that the 10 μm C coating has little effect on the micros-trip line under 5 GHz, and has a slightly larger influence on the micro-strip line under about 10 GHz, which can be used for the protection of micro-strip lines in the microwave components below 5 GHz.
    12  Reliability Analysis of Radar Power System with High Altitude and Periodic Loads
    JI Shaowei SUN Yong XIE Ning
    2018, 40(11):57-63.
    [Abstract](2838) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    As the main equipment of the radar power supply system, the reliability of the diesel generating set is very important for the radar mission. Both altitude and radar load working mode have great influence on the power supply reliability. There is a gap between the traditional method and the actual situation. The reliability of the power supply system with two kinds of periodic load is strudied. Based on the reliability theory, the reliability function and the average life of the system are derived. Two plans are compared on the cost, maneuverability and the reliability by the engineering example. The optimal power supply plan can be obtained by the algorithm in this paper. The method is extended to the general situation of multiple periodic loads. This paper provides the theoretical basis and a new calculation method for improving the reliability design ability of radar power supply system.
    13  The Static Test Methods of Ship Rocking Isolation Degree for Shipboard Radar Servo System
    QU Yuanxin PAN Gaofeng MAO Nanping
    2018, 40(11):64-67.
    [Abstract](2753) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    It is a special problem for the tracking of shipboard radar servo system to isolate ship rocking interference. Currently ,the debugging on effect of isolating ship rocking interference is mainly conducted under the condition of swing table test on the radar proving ground or on-site ship rocking on the sea . However , these will cost a mountain of manpower and material resources. In order to achieve the simple test under the static conditions and provide a new method of debugging on the effect of isolating ship rocking interference , the shipboard servo system loop model is developed, two static test methods of digital-guide-loop-based and self-tracking-based are proposed. Through simulation analysis and field test , it is proved that the approach is ready to implement and convenient for engineering applications.
    14  Miniaturization Design of a High Power Multi-beam Klystron Transmitter
    LUAN Di
    2018, 40(11):68-70.
    [Abstract](2768) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Vehicular radar and high power airborne radar have strict demands on volume and weight of vacuum tube transmitter, so it is necessary to miniaturize radar transmitter. Miniaturization design of a high power multi-beam klystron transmitter is introduced. The main key performance indicators and the system constitution are presented. The emphasis is put on the key technologies of high power density high voltage power supply, miniaturization of solid state modulator, the integrated design method of high voltage power supply and the thermal design of final module. Experiments indicate that the miniaturization of transmitter meets the expected design requirements. The application and prospect of the transmitter is discussed.
    15  Application of STK Software in Digital Target Scene Simulation
    GUO Xiaoyu XI Chaochao PAN Zhiming
    2018, 40(11):71-76.
    [Abstract](2804) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    In order to solve the problem of lack of realistic battlefield situation and target trajectory display in digital target scene simulation, the idea and method of using satellite tool kit (STK) to display three-dimensional scene environment is presented. By researching the STK development interface and object model library, the method of development using STK component object model (COM) interface in Windows application based on microsoft foundation class (MFC) is discussed, the embedding of STK three-dimensional display window directly in Windows application is realized, and the trajectory information is imported and displayed using STK ephemeris file. At the same time, the conversion method of target position between radar coordinate and latitude and longitude is given. In this research, the problem of the three-dimensional scene display in the digital target scene simulation is solved, the more realistic simulation scene for the radar system is provided, and the user experience is enhanced, so the research has high engineering application value.
    16  Oblique Projection Based Collaborative Algorithm for DOA
    XU Wei ZANG Xu WANG Changyu
    2018, 40(11):77-80.
    [Abstract](2790) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Both direction of arrival (DOA) and waveform of array receiving signals are necessary to be analyzed in the field of array signal processing. In this paper, a novel oblique projection based collaborative algorithm for DOA estimation and blind signal identification is proposed to adaptively analyze unknown array receiving signals without knowing a priori DOA or waveform parameters. The proposed algorithm alternately uses oblique projection spatial filtering technique to separate mixed array receiving signals into separated single signal groups. In each signal group, both DOA estimation and waveform identification are implemented. The proposed algorithm exhibits excellent estimation performance with moderate to low snapshots and is applicable to the cases where exists main lobe interference. Both theoretical analysis and simulation result verify the effectiveness of the proposed algorithm.
    17  A New-style Jamming Technology and Implementation Based on Interrupted-sampling
    ZHANG Jianzhong WEN Shuliang GAO Hongwei SHA Minghui LIAO Shengnan
    2018, 40(11):81-85.
    [Abstract](2756) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    In order to interfere multi radars, the jammer investigation time should be as long as possible to ensure different radar signals are received. Besides, interference signal should generate effective interference on time, frequency, pulse compression domain. LFM signal is discussed, based on duty cycle equals 50%, through interrupted sampling, repeated stacking and frequency shift modulation, a new jamming type and implementation architecture are proposed. Moreover, the influence of different overlay delay count weigh and frequency shift modulation on number, amplitude and density of dense false target are studied. Simulation shows that the jamming can play a good role in deceiving many false targets and ensure duty cycle, uniform amplitude weighting accords with practical application when K=N.
    18  Problem Analysis and Application Research on Airborne Radar Software Quality
    QIU Ting SHENG Wei JING Min
    2018, 40(11):86-90.
    [Abstract](2790) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Taking airborne early warning, airborne fire control, airborne imaging radar, and other products as the research objects,The software quality status of airborne radar products in recent years is described, the quality failure of airborne radar software is sorted out. The statistical analysis according to the failure mode and the Pareto principle have been used to analyze the main causes of functionality, reliability and other problems of software quality. The software requirements problem is identified as the most critical and frequent reason that affects the quality of radar software firstly, then specific countermeasures and suggestions from the software requirements development process and software requirements management process are proposed to enhance the software quality control management.

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