Issue 11,2016 Table of Contents

1 An Improved Effectiveness Evaluation Method of Radar Signal Recognition

ZHANG Qiang , WANG Hongwei , CHEN You

2016(11):1-6.

[Abstract](5197) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
In order to solve the problems of radar signal recognition methods in fuzzy evaluation index selection, single method for index weight determination and unreasonable assessment order, an improved radar signal recognition evaluation method based on IAHP-Entropy-I2TOPSIS model is put forward. The method builds tree viewer evaluation indexes system based on measurement of recognition rate. In this model, the subject and object weight are calculated by IAHP and Entropy method. The linear combination method is used to determine the comprehensive weight. ITOPSIS method is optimized by using the method of inclination measurement for interval multi-attribute decision-making. The optimization method is I2TOPSIS, which is used to evaluate and order. Finally, the results of case simulation show the validity of the proposed method.

2 Effects of AEW Airspace Allocation for Covering Responsible Area

QI Wei , LI Xia , CAI Wanyong , LU Qianhong

2016(11):7-10.

[Abstract](5243) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
For aircraft early warning(AEW) airspace allocation when performing intelligence-ensured missions in responsible area, two basic principles were put forward. One principle was covering total responsible area in real time, the other was ensuring selfsecurity. The model for estimating the total responsible area of the key flight level was constructed based on the real vertical coverage of the AEW. By simulation, the relation between the real-time total responsible area and the major parameters of the AEW airspace allocation were analyzed. Simulation results showed that maximum real-time covering length could be achieved when AEW straight flight course paralleled the nearby border of ribbon responsible area. It's practically valuable with factual AEW airspace allocation.

3 Design and Simulation of Smart Jamming Noise Signal Based on Velocity Deception

LI Shuyu , HU Zenghui

2016(11):11-14.

[Abstract](5384) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
Using digital radio frequency memory(DRFM) technology to realize deception jamming and noise characteristics of smart noise jamming, good effects can not be achieved from the side-lobe blanking and sidelobe cancellation of radar anti-jamming measures. To solve the problem, based on the analysis of working mechanism of modern radar active noise, combining with the target echo track-related technology, a speed drawing-out cheat and convolution modulation combined new type of smart noise jamming signal form is designed, in order to enhance both smart noise jamming effect of deception and noise suppressing jamming and respond to the ability of anti-interference measures. Simulation results verify the effectiveness of the jamming signal form.

4 Structure and Development of Shipborne Radar/Electronic Warfare System

ZHAO Peicong

2016(11):15-17.

[Abstract](5112) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
The most important part of a warship is the shipborne radar/electronic warfare system, which plays a critical strategical role in the air, naval and information warfare. Firstly, the shipborne electronic equipment of US navy is introduced in this paper. Secondly, the combat objects and mission of our shipborne radar/electronic warfare system is analyzed. It's promptly important to integrate the structure of shipborne radar and electronic warfare system. And the future tend of development of shipborne electronic system is discussed.

5 Search Strategy Design for Electronic Support Measure Based on Adaptive Genetic Algorithm

DU Hao , BI Daping , LI Minle

2016(11):18-23.

[Abstract](5292) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
Electronic support measure is an important part of radar reconnaissance, mainly through existing intelligence information on the high level threat emitters to make high precision measurement or verification. Such operation heavily demands on timeliness and accuracy. Traditional search mode tends to be periodic pattern or stayed on certain region, which is not fully fit with the emitters' characteristics or the task requirement and possesses poor flexibility. Based on the adaptive genetic algorithm, this paper designs and analyzes the search strategy of electronic support measure. Each chromosome corresponds to a search strategy; the gene value of the chromosome and the position of the gene corresponds to the search intervals and the dwell sequence of search strategy separately. Based on the fitness function, which is calculated by the intercept probability, chromosomes take induced mutation to find the optimal offspring which is also the desired search strategy confronted with the current environment. Theoretical derivation and experimental simulation verify the feasibility and effectiveness of this method.

6 A Study on the Direction-finding Performance of Uniform Circular Array with Odd and Even Numbered Sensors

TAN Wentao , LIN Ming , LI Rengang

2016(11):24-29.

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Abstract:
Compared with the other shapes of antenna array, uniform circular array is more suitable for the application requirements of direction鄄finding receiver used for electronic reconnaissance. In this paper, uniform circular array is projected into non-uniform linear array which changes with the incident angle. The characteristics of wave path difference in uniform circular array with odd and even numbered sensors are analyzed, the corresponding radius selection formulas are given, and a method for representing the error trends of direction-finding with the coefficient of correlation is proposed. Equivalences in all directions, accuracy of direction-finding, characteristics of phase ambiguity and sensitivity of array element location are simulated in two different cases. Validity of the inferences and the formulas is verified through simulation. The conclusion of this paper has high referential value for shaping a uniform circular array in engineering applications.

7 Improved Fuzzy C-means Clustering Based on Ant Colony Algorithm

GAO Jinkai , HOU Wen , YANG Bingqian , WANG Yunyun

2016(11):30-34.

[Abstract](5318) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
In the study of image segmentation, fuzzy C-means clustering algorithm (FCM) has been greatly improved compared to the previous hard clustering, which is a clustering algorithm based on a function of best practices. However, the clustering center and number are difficult to be determined for the traditional FCM, also the search process is easy to fall into local optimum. So an improved FCM clustering algorithm is proposed based on the ant colony algorithm. The improved algorithm uses the global optimization features and strong characteristics of robustness of ant colony algorithm. The cluster centers and number obtained by ant colony algorithm are applied to a traditional FCM algorithm to make up for the shortcomings of the traditional FCM. The improved algorithm improves the image segmentation accuracy by processing the image blocks and introducing the multi-scale gradient. Finally the effectiveness and the practicality of the improved algorithm is verified through the experiments.

8 Study and Realization of Boot Procedure of Multi-core DSP C6678

WU Qinwen

2016(11):35-39.

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Abstract:
Multi-core drgital signal processing (DSP) brought a quality improvement to the signal processing capabilities. The TMS320C6678 DSP presented by Texas Instruments (TI) is a representative high-performance multi-core DSP. Boot technique is one of the key techniques of the DSP's application. C6678 has various peripheral interfaces and can select different boot devices. Owing to this and the existence of multiple cores, it's boot procedure is considerable complex. This paper gave a deep research on boot modes of C6678, discussed the specific boot steps of C6678's eight cores, providing practical methods and experience to the developing of C6678 boot programs.

9 Application of Logarithm Transform in High Resolution Range Profile Target Recognition

SUN Jingming , YANG Yuhao , XING Yuanjian , WANG Ziqian

2016(11):40-43.

[Abstract](5287) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
In radar target recognition based on high resolution range profile, power transform is a common nonlinear preprocessing method, which can improve the recognition rate. But the performance of high resolution range profile target recognition with power transform is seriously affected by signal-to-noise ratio, and the recognition result is significantly affected by the choice of the power transform exponential, even the effect is adverse. In this paper, logarithm transform is raised for high resolution range profile preprocessing to solve the problems of power transform, and a comparative analysis of the similarities and differences between the mechanism of logarithm transform and power transform is provided, and the impact of logarithm transform on the intra-class and inter-class correlation coefficients of high resolution range profiles is analyzed. The results show that logarithm transform is more suitable for high resolution range profile preprocessing than power transform, and the experimental results based on measured data show that logarithm transform can more effectively improve the recognition rate than power transform.

10 A Statistical Optimum Deconvolution Real Beam Sharpening Algorithm Based on Real Measured Data Processing

HUANG Baisheng , LIU Zhaofeng

2016(11):44-48.

[Abstract](5064) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
Because the real beam map of azimuth resolution is low, from which it was difficult to separate the useful information such as airport, ship and coast line target, which can not be implemented to ground and sea attack fighter. This paper presents a statistical optimum deconvolution real beam sharpening algorithm based on real measured data processing, through the algorithm of motion compensation and iterative algorithm, sharpening the real beam map, to achieve azimuth super resolution, from the simulation data analysis and real measure data processing can be seen from the results, the proposed method can effectively improve the real beam map azimuth resolution, with a strong engineering application value.

11 Modeling and Compensation of Radar Data Random Error Based on the Time-series Model

ZHANG Ruiguo , LI Chunyu , DING Zhihong , XU Wentong , PANG Yuning , YE Junhao

2016(11):49-52.

[Abstract](4973) [HTML](0) [PDF 0.00 Byte](0)

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Aiming at the problem of considerable radar data random error, the autoregressive integrated moving average (ARIMA) model is analyzed by time-series analysis method. The ARIMA model and Kalman filter are designed based on the foregoing 4 000 data points to smooth the radar data, which is obtained by measuring the International Space Station. The foregoing 4 000 data points and other points are processed by the filter respectively, and random error reduces to 13.7% and 20.1% of the original data separately. The results show that the random error of radar measurements can be reduced effectively by the new method, improving the data quality.

12 A Study on Ballistic Missile Tracking in ECEF Coordinate System

XU Dengrong , CHENG Shuiying , BAO Shouliang

2016(11):53-60.

[Abstract](5131) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
Aiming at the problem that single model tracking algorithm can not track the ballistic missile accurately, an interacting multiple model (IMM) algorithm is proposed in Earth-centered Earth-fixed coordinate for continuously tracking the missile for all the flight stage. According to the force condition in different stages of trajectory, the corresponding tracking model is established. The axial force of target almost keep constant in boost phase, the constant axis force model is adopted; coast and reentry phase use the passive phase tracking model to track the missile. Both the models use the cubature Kalman filter algorithm to filter. In view of the problem that a bias is caused in the mixing stage of this IMM algorithm, an unbiased mixing method is adopted. The simulation results verify the superiority of the algorithm.

13 Design of Microstrip Antenna Array at K Band

WU Huifeng , WANG Jian , RAO Yuru

2016(11):61-65.

[Abstract](5382) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
In order to improve the function distance, range and lessen disturbances from other directions, for meeting the needs of antennas in radars, a receiving and transmitting antenna system with special direction pattern is designed and optimized, adopting DFP-BFGS algorithm with unequally-spaced array. Then, a microstrip antenna array with TX and two RXs (RX1、RX2) integrated in a Rogers4350B material is designed and stimulated, forming special direction diagram in E-plane. At last, the triple-antenna is processed and tested, with result that the beam-forming in E-plane of the antenna array has a good effect, effectively improving the function distance and range of radar and lessening the disturbance of signals from other directions.

14 Application of Tilted Super Sub-arrays on Vehicle Mounted Radar Antennas

MA Jing , LIU Minggang , NI Yinghong

2016(11):66-70.

[Abstract](5114) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
The aperiodic array arrangement and the radiation performance of the ground based radar-prototype antenna are discussed firstly. Then with an engineering example, the design method of tilted super sub-arrays is introduced, which are used to compose array antennas of vehicle mounted radars. Both simulation and experiment are carried out, the results of which are also presented and agree well with each other, validating the design method and analysis. This work has certain instructional significance to relevant engineering practice.

15 A Study on the Calibration of Amplitude and Phase Consistency Based on the System of Multi-mode Tracking

CHEN Fengyou , SHI Yiming

2016(11):71-74.

[Abstract](5256) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
The previous calibration method of the amplitude and phase consistency, which is used on the monopluse radar, has some weak points, such as the performable process being complex and the calibrating environment being limited. Multi-mode tracking established a mathematical model of the relation between deviation angle and error voltage, through obtaining the variational value of deviation angle and error voltage, a new method is determined, which is used to calibrate the amplitude and phase consistency. It has important application value for improving the efficiency of the amplitude and phase calibration, as well as overcoming the limitation of the calibrating environment.

16 Design of Equivalent Sampling Ground Penetrating Radar Receiver with Time-varying Gain Dynamic Range

XU Wei , ZHANG Ming

2016(11):75-78.

[Abstract](5094) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
Impulse ground penetrating radar (GPR) has some obvious advantages in the field survey, such as simple waveform generation, high pulse repetition, no interference in frequency domain and so on. The common GPR systems are based on the impulse radar technique and are prevalent in the commercial market. However, small dynamic range is the common problem in the GPR receiver system currently, which limits its application in the field of deep penetrating. In this thesis, the large dynamic range receiver technology of impulse GPR system is studied deeply and time-varying gain dynamic range compression technology is proposed for the equivalent sampling circuit. The technology can provide 20 dB dynamic range compression for the received signal. A physical receiver has also been developed with good performance.

17 Techniques of Non-coherent Active Decoy Based on Space Separation Point

BAI Fuzhong , CAO Fei , DUAN Jiazhen , TANG Junyao

2016(11):79-82.

[Abstract](5277) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
With the rapid development of modern electronic countermeasure technology, more and more attention is being focused on the active decoy technology for anti-radiation missile(ARM). It is an effective method to use active decoy against ARM. In this paper, the mathematical model formula of non-coherent active decoy confront ARM is derived. According to the ARM radar seeker before and after the arrival of the space separation point, an active decoy model is proposed. And the decoy effect on the non-coherent two point source, three point source, four point source decoying in considering space separation point and not under the two conditions are simulated and analyzed. The results show that when the space separation point is considered, the effect is not only better, but also more close to the reality.

18 Accuracy Analysis of Ballistic Missile Impact Point

SHI Yanlong , MA Yanqin , MA Yonglin

2016(11):84-87.

[Abstract](5608) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
Ballistic missile impact point estimation is a key progress in air defense and anti-missile early warning system( EWS), the capability of EWS is affected by the accuracy of the impact point directly. This paper build a refined physical model of ballistic missile, the factors of ellipticity of earth, drag of atmosphere and rotation of the earth are considered. A comparison of different factors is presented by simulation, the analysis of the main factors affecting of impact point accuracy is described and some conclusions are drawn in the end.

19 Analysis of Characteristics for Reentry Capsule in Blackout Based on Numerical Simulation

ZHANG Yongqiang , ZHANG Ye , WEI Yonghui , LI Jinkui , SUN Yuzhu

2016(11):88-94.

[Abstract](5336) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
In order to research the characteristics in blackout of plasma sheath for the reentry capsule, this paper simulated the reentry capsule in the blackout based on FASTRAN software, the surrounding flow field and parameters of ionized gas distribution of the reentry capsule were obtained. The results showed that the compressed gas formed strong bow shock because of supersonic flight,the pressure and temperature were both increased in the shock. The gas ionized and the NO+ and electron were generated,the plasma sheath surrounding the reentry capsule was formed. By analysing the results of different reentry capsules, they were seen that after the shock layer,the change of gas temperature was related to initial velocity, the gas pressure was related to initial velocity and initial pressure;the dissociation of gas was related to vibrational temperature,the vibrational temperature for N2 dissociated was higher than O2; the major parameters of plasma sheath were the translational temperature and the electron density, the magnitude and distribution were almost the same at the same normalized distance of different reentry capsules.

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