Issue 3,2019 Table of Contents

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  • 1  Analysis of Navigation Radar Performance Improving Based on Beam Digital Compensation
    LUAN Zhuzheng
    2019, 41(3):1-6.
    [Abstract](2610) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Aiming at the problem that beam deviation of navigation radar caused by ship swing may influence radar detection performance, this paper puts forward a solution based on digital beam compensation technique so as to make up the azimuth pointing deviation caused by radar beam moving with ship swing and eliminate influence to azimuth accuracy etc radar performance by pitch/ roll swing. At first, this paper establishes mathematic models for ship pitch/ roll and makes target echo analysis ,employs vector transform and plane rotary transform with solid geometry relation obtain real value of azimuth angle of horizontal beam, and conducts analysis to change of horizontal beam gain and beam width and azimuth compensation remainder of low鄄altitude targets. The effectvenss of this method is validated by simulation at high & low sea condition and it is able to provide theoretical support for radar engineering.
    2  Design of Mission Planning Software of Radar Network Detection System
    REN Qian
    2019, 41(3):7-11.
    [Abstract](2463) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    This is an analysis of the concept of mission planning of the radar, and it analyzes the concept of mission planning, and it has designed the software for mission planning, which includes mission management, scene management, detection scheme generation, scenario, and the analysis of the method. In addition, this paper also discusses how to efficiently design the database management system for efficient task data storage and inquiry in the case of large data quantity, complex business logic and system elements. The mission planning software designed in this paper can realize the visual operation of the detection process in the established mission scenario, and effectively improves the information level of the mission planning process of the radar network detection system.
    3  Antenna Deployment Method for MIMO Radar in Dynamic Environment
    WANG Ziqin ZHANG Tianxian YANG Yichuan KONG Lingjiang YANG Xiaobo YANG Jianyu
    2019, 41(3):12-16.
    [Abstract](2586) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Antenna placement for a distributed Multi-Input Multi-Output (MIMO) radar in dynamic environment is studied. We use Kalman filter (KF) and particle swarm optimization (PSO) to solve the problem. Considering multiple surveillance regions in dynamic environment, we have to compute new deployment schemes when scenario changes. The background of the problem research is introduced and the mathematical model to be optimized is established in this paper, and the process of the algorithm is given. Then, we analyze the performance of the algorithm. Finally, numerical results are provided to verify the validity of the proposed algorithm.
    4  Novel approach of radar word extraction for MFRs based on event-driven method
    WANG Yongun
    2019, 41(3):17-20.
    [Abstract](2477) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Radar word extraction is the base for multi-function radar (MFR) behaviour cognition from the intercepted pulse sequence. As a crucial part in the pulse sequence analysis, common methods only utilize the time-of-arrival (TOA) of pulses, which perform not well when dealing with the complex signals with multiple parameters changing. Based on the traditional event-driven method, an improved approach is proposed, and radar words can be extracted by the steps of quantization coding, event probability calculation and word extraction decision. Simulation with hypothetical MFR signal data is presented, showing that the proposed method is effective and not sensitive to the missed or spur pulses. The extracted radar words can be used in MFR state recognition to support the adaptive radar countermeasures.
    5  Distribution Optimization of Stochastic Radiation Source Based on Spatial Distribution Entropy
    LIU Bo ZHANG Jianlin WANG Dongjin
    2019, 41(3):21-26.
    [Abstract](2560) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    In microwave staring correlated imaging, the distribution optimization of the stochastic radiation source is now based on the maximum effective rank of the stochastic radiation field matrix. However, the efficiency of the optimization algorithm is too low because of the complex computation of the objective function. Focusing on this problem, a distribution optimization method based on spatial distribution entropy is proposed in this paper. Firstly, the concept of spatial distribution entropy is established to quantitatively characterize the randomness of the stochastic radiation source distribution, and the positive correlation between the spatial distribution entropy and the effective rank of the stochastic radiation field matrix is verified. Then, using the spatial distribution entropy as the objective function, genetic algorithm is introduced to optimize the distribution of the stochastic radiation source. Finally, the simulation results illustrate distribution optimization of the stochastic radiation source effectively improves the MSCI performance.
    6  Space-time Adaptive Processing Algorithm for Ground Moving Target Detection Based on Zero Correlation Zone Codes
    YAN Xiulin GUO Jingjing TAO Haihong
    2019, 41(3):27-31.
    [Abstract](2519) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    A multiple-input single-output space-based SAR-GMIT system can transmit multiple orthogonal signals and realize GMTI avoiding the data transmission among the receiving satellites, of which the integrated side-lobe level is so high that clutter suppress performance of image domain is poor. Therefore, a space-time adaptive processing algorithm about ground moving target detection based on zero correlation zone codes is proposed, which can ignore the influence of integrated side-lobe to SAR image and clutter suppress performance. The computer task is less than SAR-GMTI algorithm and ground moving target detection on a single satellite receiver is also successful. The simulation results and performance analysis show that the proposed algorithm is efficient and feasible.
    7  Software Health Management Design for Radar Signal Processing
    HAN Wenjun LI He LIU Feng
    2019, 41(3):32-35.
    [Abstract](2578) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Radar is a complex embedded system which needs maintenance friendly, lack of runtime software health management for radar signal processing system, fault location would be a hard job when system abnormality occurred, which resulted to an extending system debugging period and poor maintainability. In this paper, designing software health management by building hierarchical online monitoring system and health assessment indicators for radar signal processing system is a feasible method to solve this problem. The software architecture of software health management is designed based on model view controller and the interactive interfaces are developed based on hyper text markup language. The software and hardware monitoring mechanism is adopted for health data collection and evaluation, which supports hardware and software runtime status, function and performance online monitoring and visual display. It realizes full-cycle maintenance for radar signal processing, which easies system fault analysis and fault location, applies to radar signal processing system design and greatly improves the efficiency of integrated joint test and troubleshooting.
    8  A Study on Impulse Response Function for Low-frequency Wide-beam SAR
    ZHUANG Long XU Daobao
    2019, 41(3):36-41.
    [Abstract](2482) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    For synthetic aperture radar(SAR),the imaging results can be depicted by the impulse response function(IRF) of the imaging system. IRF can be viewed as the imaging result of an ideal point target. The resolution and side-lobe level can be analyzed by the IRF, and the performance of the imaging system can be further accomplished. In this paper, the IRF of the ultra-wide beam low-frequency SAR system is studied, which is different from the traditional narrow-band and narrow-beam SAR system. The precise IRF of the low-frequency ultra-wide beam SAR is deduced. Based on the relationship of the supported Fourier spectrum and the IRF, the characteristics of the IRF are analyzed and demonstrated by simulated and the real data.
    9  Passive Radar Localization Algorithm with Bias Registration
    CHEN Zhimeng ZUO Yan WANG Wenguang
    2019, 41(3):42-47.
    [Abstract](2445) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    A joint passive localization and bias registration algorithm using Direction of Arrival (DOA) and Time Differences of Arrival (TDOA) measurements is proposed to solve the localization problem in the multi-static passive radar system using illuminators of opportunity under the influence of system error. Firstly, the nonlinear DOA and TDOA measurement equations are linearized by introducing an intermediate variable. Then, a joint estimation of target location and system biases are obtained by a recursive weighted least squares algorithm. Moreover, a dependent least squares algorithm is developed to improve the initial estimation using the relationship between the intermediate variable and target location variables. Finally, an iterative post-estimate procedure is exploited to further enhance the accuracy of target localization. Simulations indicate that the proposed algorithm can effectively estimate the system biases and target state.
    10  Joint Data Association and Spatial Registration Based on ML
    ZHOU Xueping LI Jiajie ZOU Jintao LOU Yangge
    2019, 41(3):48-52.
    [Abstract](2460) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Aiming at the data association and spatial registration under radar measurements with missing detection, a joint data association and spatial registration algorithm based on maximum likelihood (ML) algorithm is derived. Multidimensional assignment algorithm is adopted to associate measurement data, the radar system biases are estimated by ML algorithm, and the convergent system biases and associated matrix are obtained by jointly applying data associate and spatial registration iteratively. Simulation results show that under the environment that measurements may have missed detection, the proposed algorithm can estimate the system biases efficiently. It shows good robustness and anti-noise performance.
    11  A Method for Azimuth Angle Jumping Instantaneously in Radar Tracking Coordinate
    ZHUO Yihong JIANG Qiuxi LIU Xin LIU Shaoping ZHANG Wubing
    2019, 41(3):53-57.
    [Abstract](2509) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Azimuth mutation is a particular situation in the radar coordinate system, ending up with the tracking algorithm diverges and the tracking performance reduces. Aiming at this problem, this paper substitutes the combined values of azimuth angel’s cosine and sine function for the azimuth angel in radar measurement. Since the covariance matrix of the modified measurement is a singular matrix, the diagonal matrix composed of the azimuth variance is used to replace the covariance matrix of the two trigonometric functions. The simulation results show that the correction measurement and its replacement of covariance matrix have little effect on the tracking accuracy, and even in the case of sudden angle change, the tracking algorithm combined with the modified measurement data can also achieve stable tracking of the target.
    12  GM-PHD Engineering Optimization Algorithm Based on Infrared Data Assistance
    ZHANG Teng XING Mengdao CAO Chen ZHANG Jing
    2019, 41(3):58-62.
    [Abstract](2487) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    This paper uses the excellent azimuth accuracy of infrared sensors to solve the problems of random finite set GM-PHD algorithm in engineering applications. A method is proposed to optimize the target tracking in two ways. First, the infrared sensor determines the starting information of the new target and forms the initial value of the random target of the new target. Second, infrared data corrects Gaussian weights in real-time during target tracking to ensure the stability of the algorithm. The simulation verified that the target tracking effect of this algorithm has been greatly improved.
    13  An Ultra-wideband Dielectrically Quad-ridge Flared Horn Feed
    YANG Fan DU Biao HE Yingran WU Yang LI Dong
    2019, 41(3):63-66.
    [Abstract](2536) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    In ordinary quad-ridged flared horn (QRFH) feed, the illuminating efficiency will drop sharply as the operating frequency increases, which leads to a limited operation bandwidth. A dielectrical loading technology is proposed to solve this problem in this paper. The investigations show that the dielectric rod at the center of the QRFH could stabilize the phase center and widen the beam width, and thus expand the radiation bandwidth of the QRFH feed from 5:1 to 10:1. Simulated results show that the reflection coefficient is lower than -10 dB. When the feed is used to illuminate a 10 m diameter reflector (f / d = 0. 36), the aperture efficiency is higher than 50% across the whole bandwidth.
    14  A Broad- band and Wide-angle Dual-polarized Low-profile Phased Array Antenna
    CHEN Honggang SUN Lei WU Hongchao
    2019, 41(3):67-71.
    [Abstract](2536) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    A meter wave band broad-band and wide-angle dual-polarized phased array antenna is proposed, which realizes the antenna design with simple structure, light weight and low profile. The tight coupling between the radiating elements provides basic broadband characteristics; the improvement of the single-stub balun and the measure of loading the separator lower the profile as well as further tap the broadband potential; besides, a wide-angle impedance matching layer is proposed to ameliorate the performance of wide-angle scanning. In the end, 135 MHz ~ 270 MHz and ±45°scan are reached only in the height of 0. 1λL profile, which has broad application prospects in the case of broad-band and wide-angle requiring strict low profile.
    15  Analysis and Countermeasures for Nut Release Failure of Antenna Pitching Drive System
    QIAN Jianguo HAO Jiangang
    2019, 41(3):72-74.
    [Abstract](2617) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Trapezoid screw nut pair can have self-locking function and is often used in antenna pitching drive system of the radar. In this paper, the failure reasons of the nut release of antenna pitching drive system in a high mobility radar are analyzed from the aspects of surface roughness of the trapezoid screw thread, the processing process of leading screw, the selection of the friction pair
    16  Design of Advanced Metric Wave Radar DBF Analog Receiver
    FENG Zhenwei ZHANG Shujun YANG Chunliang
    2019, 41(3):75-78.
    [Abstract](2523) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    Higher performance is required in a modern radar receiver. Digital receiver can meet the needs and it has been an effective implementation method for radar and communication systems. The digital receiver is discussed in this paper, the match of analog receiver and digital module, the calculation and allocation of gain are focused on. A detailed design of analog receiver is presented according to special requirements. The analysis, calculation and detailed design of all units are made, an analog receiver example is developed and the test results are given after debugging. The test results show that the performance of the analog receiver example meet the needs of the design. It has been used in an example system and works stably and well.
    17  A Comparative Analysis between Blind Source Separation and ASLC in Jamming Suppression Performance
    LIU Guoqing WANG Ning YANG Yuhao SUN Jun
    2019, 41(3):79-82.
    [Abstract](2571) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    With the aim to solve the problem on how to choose jamming suppression method between the blind source separation(BSS) and the adaptive sidelobe canceller (ASLC), the jamming suppression performance of BSS and ASLC are comparatively analyzed. Based on the study on the principles and signal processing methods of BSS and ASLC, the jamming suppression performance of BSS and ASLC under different jamming and signal-to-noise-ratio conditions are investigated by simulation. Through analysis, the theoretical basis for the choice of jamming suppression method under different scenarios is presented, i. e. , the ASLC is more effective in suppressing sidelobe jamming, while the BSS technique performs better on mainlobe jamming suppression.
    18  A Suppression Technique for Range Deception Jamming in Multistatic Radar System
    HUANG Datong CUI Guolong KONG Lingjiang
    2019, 41(3):83-90.
    [Abstract](2554) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    To counter multi-range-false-target deception jamming, an anti-jamming technique based on homologous localization examination has been proposed. First, the azimuth angle measurement of target is pre-processed in each receiver to group the targets that exist in the same direction. Then data compression is implemented in order to improve the accuracy of angle measurement. At the same time, with the combination of one transmitter and one receiver, target localization of the bistatic radar system is implemented. Finally, homologous localization examination is performed using the localization results from each receiver, after which targets position can be estimated by position fusion. Simulation results verify that the proposed method can suppress the deception jamming effectively and realize the localization of multiple real targets with high precision.

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