Volume 0,Issue 4,2012 Table of Contents

1 Method of Dual Threshold Intermittent Target Tracking Based on Infrared / Radar Cross Location

XIONG Jiu-liang , FENG Ji-ping , HAN Zhuang-zhi , HE Qiang , XU Hong

2012, 34(4):1-8.

[Abstract](9720) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
In order to solve the target-losing period problem in netted fire-control radars忆intermittent tracking, dual threshold infrared/radar intermittent target tracking method is proposed. Firstly, improved algorithm of antenna beam control is used to eliminate the effect of correlative errors. Then, the method uses dual threshold to control sensor's working time, and increases silent radar' s response time by cross location of infrared sensors. At last, sequential filtering fusion algorithm based on data compression is used for dissimilar data fusion, and continuous target track is formed. Simulation results showed that this method could weaken the effect of target-losing period problem and improve system performance.

2 Analysis and Simulation of Cueing Probability Among 3D Radars

FAN Hao , HUANG Shu-cai , LI Ya-jun , WEI Dao-zhi

2012, 34(4):9-14.

[Abstract](9559) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
To solve the 3D radar cueing 3D radar of networked radars for detecting targets cooperatively, the successful cueing probability model is built, furthermore the successful cueing probability and the cueing error of 3D radar cueing 3D radar are analyzed and derived. The related parameters' effect on the successful cueing probability at different conditions are discussed and simulated whether the target moves or not. Finally, some related properties of the successful cueing probability are also given. The conclusions presented in this paper will offer some advice for choosing the parameter and collocation of the netted radars and have important reference value for the design the 3D radar to 3D radar guiding and cueing systems.

3 A Study on Relationship Between Power Range of Radar and Flight Path in Visualization Simulation

ZHANG Yang , ZHANG Jia-wei , GAO Jun-shan , CUI Xin-feng

2012, 34(4):15-18.

[Abstract](9248) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
In allusion to solve the problem how to calculate the point of intersection between power range of radar and flight path in the three-dimensional space,on the base of air force visualization simulation production in existence,the relationship between power range of radar and flight path is studied, then the function expression for the power range of radar and the flight path equation which is based on the geographic coordinates are established. Meanwhile the parametric equation transform arithmetic is given, which converts the function expression and the flight path equation to the orthogonal coordinates and uses the numerical solution to solve the transcendental equations problem. Using Matlab to simulate and validate,the feasibility and validity is indicated.

4 Design of Sampling Interval and Power Based on Radio Frequency Stealth

ZHANG Zhen-kai , ZHOU Jian-jiang , TIAN Yu-bo , YANG Qing

2012, 34(4):19-23.

[Abstract](9161) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
Adaptive design of sampling interval and power is studied in this paper. A novel method of adaptive sampling interval design is proposed based on interacting multiple models (IMM) tracking algorithm and covariance control method. Desired tracking accuracy is set for every target firstly, and then the algorithm selects the largest sampling interval from the interval sequence. On the condition of constant detection probability, an adaptive method for emitting power is given based on target distance and radar cross section(RCS). The simulation results show that the method is effective.

5 Applications of Sparse Regularization in Bistatic ISAR Range Profile Imaging

HAN Ning , LIU Wei , HE Qiang , DONG Jian

2012, 34(4):24-27.

[Abstract](9006) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
In bistatic inverse synthetic aperture radar (ISAR) imaging, resolution of one-dimensional range profile decreases because of the bistatic angle. To solve this problem, algorithm for bistatic one-dimensional range profile imaging is researched. Based on the analysis of sparse characteristic of baseband echo, the problem of range profile imaging is converted to the signal sparse decomposition in noisy environment. With the alterable time-delay cell, regularization parameter is chosen by L-curve method. Then the sparse decomposition coefficients are estimated via generalized regularized focal undetermined system solver (FOCUSS) algorithm. Based on the coefficients, one-dimensional range profile is created. Resolution of range profile created through this algorithm could not be effected by bistatic angle and is totally decided by the time-delay cell. Simulation experiments validate the algorithm.

6 Design and Implementation of High-performance DPC Based on HuaRui-1

ZHOU Hai-bin , LIU Gang , LI Ming

2012, 34(4):28-31.

[Abstract](9652) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
HuaRui-1 is a low-power, high-performance embedded processor developed by NRIET. The 4 cores MPU with Vector Processing Unit (VPU) can be applied to most field which has massive data to be processed. A set of special vector instructions for butterfly operation of FFT is elaborated in this paper. Test result showed that 1 024 point FFT and DPC based on single core of HuaRui-1 can be accomplished in 6.12 μs and 15.36 μs. It can be used for radar signal processing and electronic countermeasure to meet the real-time requirements.

7 Software Radar Based on Software Product Line Technology

XIA Dong , CHA Hao , ZHANG Wei , XIA Kui

2012, 34(4):32-35.

[Abstract](9065) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
Software radar is the application of software defined radio in radar domain. With performance improvement of electronic instrument, hardware platfor's performance will not restrict the development of software radar any more, and it means software radar developing based on software engineering becomes more and more important, and it can accelerate development of software system of radar. However,the research of software radar halt on the realization of hardware platform now, and the research of utility of advanced software engineering technology to improve developing efficiency and reliability is few. The significance of software engineering theoretic applied in radar system developing was summarized, and software product line technology was introduced to the software developing. Domain engineer modeling of software radar was done, and domain analysis model as well as domain software architecture were generated which would be used in domain design process. Software radar developing with software product line could make full reuse of system's developing process, requirement analysis, SA, domain components, etc. which could improve developing efficiency and software quality effectively.

8 Three-dimensional Tracking and Location Algorithm for Single 2D Sensor Based on Elevation Information

LEI Yu , FENG Xin-xi , ZHU Can-bin , LI Bin-bin

2012, 34(4):36-39.

[Abstract](8965) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
According to the scan characteristic and observation information of 2D sensor, the observation model for three-dimensional moving target using single station was built, and an elevation parameterized extended kalman filter (EPEKF) algorithm for target in three-dimensional constant velocity was presented. Firstly, the elevation region of the sensor was divided into several subintervals. Then, the algorithm performs parallel absolute extended Kalman filter in each subinterval and the weights of each filter was updated according to the tracking result. Finally, the estimation from each filter was fused to obtain the final state estimation of the target. The accuracy and stability of the proposed tracking and location algorithm for the target in 3D space can be confirmed by the simulation results.

9 A Study on Convolutive Blind Separation Algorithm Based on Radar Anti-jamming

WEN Yuan-yuan , CHEN Hao

2012, 34(4):40-44.

[Abstract](9319) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
It is an important problem that the increase of the performance of radar anti-jamming for a long time in radar signal processing. Separation convolutive mixture of source signals is a challeng of blind source separation (BSS). In this paper, the algorithms of convolative mixtare BSS is used to separate the received signals of the radar to the jamming and the useful signal and realize the aim of radar anti-jamming. A new algorithm for convolutive mixture BSS by using the Householder transformation to realize the joint diagonalization of high-order cumulant and operation in the frequency domain is proposed. Using the algorithms of convolutive BSS the received signals of radar systems are separated to the radar signals and the jamming. Simulation results show that the novel method of radar anti-jamming can realize the separating of radar signals and the jamming and have the better performance of separating.

10 A Study on Ship Target Recognition Based on Outline Image

WANG Chun-hua , KANG Meng , HAO Ming

2012, 34(4):45-47.

[Abstract](9546) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
The theory of forming ship outline image is studied in this paper. Target recognition based on radar outline image synthesizes advantages of one dimension range image and echo sequence relativity. Firstly, three ship models are founded. Outline image data is simulated and multi-characters are extracted by transformed gray level Image. Then, the problem of character choise is studied based on best enlarged distance between different classes and reduced distance within same class. Finally, SNR effect and target aspect angle effect are discussed. The simulative recognition result proposes the appropriate SNR and samples to constitute templates. The analysis shows that radar outline image has good target recognition ability.

11 A Novel Autofocus Algorithm Based on Variable Step Searching and Golden Section Method

QIU Yi , LIU Zheng , LIU Qin

2012, 34(4):48-52.

[Abstract](9059) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
In order to obtain a high resolution synthetic aperture radar (SAR) image, it is necessary to use the autofocus algorithm for SAR image processing. In this paper, theory of contrast optimization autofocus (COA) algorithm is introduced. The process of COA is described as an optimal one dimension searching model. Then, theory of variable step searching and golden section algorithm is presented. First, convergence region is set by variable step searching. Then, by means of iteration, the golden section method is applied. And the iterative process may be continued until the end condition is met. Finally, the optimal estimation of Doppler chirp rate is acquired. Compared with the existing methods, the proposed algorithm has the advantages of fast convergence speed and strong robust ability. The obtained results prove the validity of this algorithm.

12 Weak Signal Estimation in Chaotic Clutter Using Fuzzy System Based on Reproducing Kernel Theory

LIU Xiang-dong

2012, 34(4):53-55.

[Abstract](9467) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
A novel fuzzy system whose fuzzy membership functions are the reproducing kernel functions is established to detect weak signals from a chaotic clutter by employing the approximating property of the reproducing kernel functions, which can generate the best structure automatically and avoid falling into local minimum with global convergence. Parameter learning is restricted to the antecedent. The proposed fuzzy system is applied to the estimation of the weak signal in chaotic clutter. The results show that the weak signals in chaotic clutter are accurately detected, which demonstrates the effectiveness of the systems.

13 Analysis of Ferrite-LHM Applied in Microwave Domain

FAN Bing

2012, 34(4):56-58.

[Abstract](9800) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
Left handed material (LHM) has the electromagnetism characteristics of negative permittivity and negative permeability simultaneously, ferrite essentially has a negative permeability. Therefore ferrite-LHM can be designed negative permittivity material. Recently this research subject is well concerned, it is mainly applied in isolator, filter and phase shifters. It has widely application foreground in microwave systems. Basis theory and performance characteristics of ferrite-LHM are presented, and its application in microwave domain is discussed tentatively.

14 Principle and Design of Plasma Antennas

WU Ge-min , LIANG Zhi-wei

2012, 34(4):59-62.

[Abstract](9259) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
The advantage of radar stealth,dynamic reconfiguration and ultra wide bandwidth brings great prospect of military applications on multifunction radar and electronic countermeasure. Plasma antennas include plasma column dielectric antenna and plasma mirror antenna. The design of plasma column antenna system is realized based on the propagation characteristics of surface wave in plasma. And the design of plasma mirror antenna system is realized based on the microwave reflection characteristics on plasma. The detailed analysis of fundamental theory and configuration of plasma antennas provides helpful theoretical and technological preparations for the further application on plasma antenna.

15 Design of a Ultra-Wideband Filter With Dual Band鄄Notched Characteristics

SUN Rong-hui , GAO Wei-dong , LIU Han , JIN Zhen-xing , LI Le

2012, 34(4):63-66.

[Abstract](9192) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
A novel ultra-wideband (UWB) bandpass filter with dual band-notched characteristics at 5. 21 GHz and 7.95 GHz is proposed in this paper according to that UWB system is easy to be interfered with the narrow-band signals. Dual band-notched characteristics of the UWB filter is realized by the method of introducing complementary split-ring resonator (CSRR), CSRR has simple structure, easy to be fabricated and integrated with microstrip plane circuit. Relations between the physical size of CSRR single structure and the filter's transmission characteristic is discussed in detail using simulation software. The proposed UWB filter is fabricated, it is in good agreement between simulations and measurements, which verify the effectiveness and correction of the design.

16 Design of High Power Microstrip Directional Coupler

LIU Zhi-hong , LI Bing

2012, 34(4):67-70.

[Abstract](9361) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
An implementation scheme and test results of 25 dB high power microstrip directional coupler is proposed. In order to test high power microwave signal accurately, microstrip coupler should have strong anti-cross interfere capability,good band flatness,low insertion loss. In this paper, compensation techniques of inductor are adopted to poise the odd mode and even mode. Design parameters are obtained by binary concept and capacitive compensation theory. The simulation and optimization are completed by soft using Ansoft HFSS. High performance and high power microstrip directional coupler is implemented. Microstrip circuit is made by substrate using Rogers RT/ duroid 6002. Solid state transmitter of 10 W and 300 W are used to test anti-cross interfere capability. The results show that, within the operating frequency range, the insertion loss is less than 0.3 dB, and the ripple level of the coupling factor better than 1 dB, and the directivity more than 9 dB.

17 Design of Radar IF Amplifier with Linear and Logarithmic Characteristics

WEI Xu-hui , YAO Zhen-dong

2012, 34(4):71-73.

[Abstract](9144) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
An IF pre-amplifier is necessary in the digital IF receiver for radar. A logarithmic amplifier for radar echo monitor is needed too. RF (Radio Frequency) transformer is employed for constructing input impedance match network. High-performance, low-noise and wide band differential amplifier AD8350 is carried on the linear amplification circuit. Double resonance band pass network acts as IF filter. Power splitter is consisted of ‘Magic T'structure. High dynamic range, wide band logarithmic amplifier AD8309 is made up the major logarithm channel chip. So, radar IF amplifier with linear and logarithmic Characteristics has been designed. Experiments show that, the amplifier operates at 50 Ωinput impedance, 30 MHz center frequency and 4 MHz band width. It possess 18 dB gain and 98 dB (1 dB compression point -90 dBm and +8 dBm) output dynamic range in linear channel. Its output voltage range is 0.19 V to 2.06 V when input power is at -68 dBm to -8 dBm in logarithm channel.

18 Wind Shear Signal Simulation of the Airborne Weather Radar

WU Ren-biao , MENG Zhi-chao , FAN Yi , SU Zhi-gang , LU Xiao-guang , HUANG Jing-xiong

2012, 34(4):74-78.

[Abstract](9177) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
Wind shear is one of the most important factors causing air accidents. It can be detected by airborne forward-looking weather radar, which is key equipment for safeguarding air transportation. With great danger and short duration, the real radar data of wind shear is difficult to acquire. So the echo simulation of the wind shear is important to the research of the wind shear detection. In the paper, a new idea for simulating the echo signal of wind shear is proposed. Firstly, a high-fidelity wind shear field is produced from the wind shear model with wind field simulation software. Then it is used to generate the time series data of radar by simulating radar operation. Finally the analysis of the simulation results demonstrates that the simulation is reasonable.

19 A Design of Embedded Video Process Circuit

ZHANG Xiao-ming

2012, 34(4):79-81.

[Abstract](9969) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
The article describes a system architecture and design of embedded video process circuit. With high performance processor and large scale programmable device, the design implement collection and transfers of TV/IR video and radar video by high speed bus. The design possesses the following characteristics: high performance, multifunction, integrative. The design has high reliability with easy maintenance and is suitable for the display terminals of ground and car carrier.

Volume 0,Issue 4,2012 Table of Contents

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