Issue 6,2013 Table of Contents

1 A Study on Radar Detection Range in Evaporation Duct Conditions

HUANGFu Yijiang

2013(6):1-4.

[Abstract](4871) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
First, shipborne radar detecting range in evaporation duct conditions is studied, and the mechanism and parmeter of duct conditions is described in this paper. Then, the detection condition of shipborne is analyzed,and the equation of detection range is given. Last, evaporation duct split-step Fourier transformation method for parabolic equation is used to analyze electromagnetic wave spread loss and the model for boundary and initialization condition is provided. The results show that higher duct height,higher target height and lower transmit angle will leads larger radar detection range.

2 A Study on Maintainability Test Methods for Radar Equipment

JIAO Zhining , DING Xueyi , SONG Guodong , TANG Xing , YU Qunning

2013(6):5-8.

[Abstract](4578) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
In order to improve the maintenance and reduce life cycle cost of the radar equipment, it is necessary to develop maintainability test methods. In this paper, the traditional test methods from GJB are introduced. Based on the features of radar equipment, the correct processing methods of sample distribution and test result are discussed. Then small example maintainability test methods used Bayes theory are provided. These methods can be adopted to make the maintainable demonstration result to be more scientific and rational.

3 Problems on Engineering Realization of DPCMAB Technique in Sapceborne SAR

FEI Jun , LIU Guangyan , HE Dongyuan

2013(6):9-11.

[Abstract](4553) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
The basic principle of the spaceborne DPCMAB SAR with the characteristics of high azimuth resolution and wide swath imaging is discussed firstly, whereas, the performance will be degraded due to the amplitude and phase imbalance among the multiple azimuth beams. By properly choosing the phase reference of the subarray and precisely calibrating the channel imbalance, an effective method is proposed to mitigate the imbalance in this paper, which is of great practical value.

4 Overview of Waveform Design Methods for MIMO Radar

LI Hongwei

2013(6):12-14.

[Abstract](4580) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
Multi-input multi-output (MIMO) radar is a new technology of active radar detection. Due to waveform diversity, MIMO radar achieves lots of advantages via waveform design. In this paper, waveform design methods are overviewed for MIMO radar. Three issues are firstly reviewed and then discussed, which are orthogonal waveform design, transmit beam鄄pattern matching design and transmit signal waveform synthesis. Finally, the future research topics are figured out for MIMO radar waveform design.

5 Method of Angle Error Extraction in Leading Edge Tracking

CHEN Fengyou , FENG Baohua , SHI Yiming

2013(6):15-18.

[Abstract](4397) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
The reflex pulse radar can’t stable track in the process of rocket aircraft first and second stage separation, a new method of angle error extraction is proposed. The method has weighted optimization to the leading edge tracking,which is different from the conventional method. Through the simulator tracking test,especially the application to the rocket first and second stage separation,it sucessfully sovled the problem of radar continuous and stable track the rocket in the stage separation.

6 A Modified Nonlinear Chirp Scaling Algorithm Based on Four-order Phase Model for High Squint Mode Airborne SAR Imaging

XIAO Jing , HU Xuecheng , ZHANG Hong

2013(6):19-23.

[Abstract](4596) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
On the condition of the squint mode imaging, there exits the serious phase coupling effect between the range and azimuth dimension in the echoes of synthetic aperture radar (SAR), which will have bad impact on high-resolution focusing. Nonlinear chirp scaling (NCS) algorithm performs a three-order phase filtering in the two-dimensional frequency and compensates the linear range variance on secondary range compression (SRC), which ameliorates the focusing performance to a certain extent. But with the increase of the squint angle, the influence that four-order and above phase and nonlinear range variance on SRC exert on high-resolution focusing is also augmented, which will deteriorate the imaging effect. A refined NCS based on the four-order phase polynomial model is proposed in this paper. The algorithm performs the three and four-order phase filtering in the two-dimensional frequency to compensate the phase coupling at the reference range and meanwhile compensates nonlinear range variance on SRC. The imaging results of simulation and live data demonstrate the feasibility and validity of the method are proposed in this paper.

7 Primary Analysis of the Comparision Test of Domestic Wind Profilers

WU Lei , CHEN Hongbin , GAO Yuchun , CAI Zuojin

2013(6):24-28.

[Abstract](4657) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
By analyzing the data in the comparison test of wind profiler from July 2005 to October, the basic technical index and feature of hardware and software of troposphere wind profilers and boundary layer wind profilers made in China was described in this paper. The availability of these data was calculated and comparison with L-band upper-air sounding system had been done. In this comparison test, the measuring performance of the wind profiler developed by China independently was acquired, which was the basis of type selection of Chinese operational wind profiler network. The results showed that the technique of wind profiler made in China was mature and could meet the operational demand basically.

8 A Study on Multi-object Detection for LFMEW Radar

ZHANG Jun , ZHOU Xu

2013(6):29-33.

[Abstract](4638) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
The chirp non-linearity in linear frequency modulated continuous wave (LFMCW) radar systems causes range resolution and capability of object detection deterioration. A new software method for non-linearity is proposed in this paper. Based on the analysis of the frequency control characteristics of current the VCO components, the affection of non linearity of frequency modulation to the beat frequency echo signal is discussed. The detection of objects in radar which has the non-linearity of frequency modulation can be converted to the detection of the frequency modulation components in beat frequency echo signal. Use the energy aggregation property of fractional fourier transform (FRFT) to LFM signal, the method for multi objects detection based FRFT is presented. The simulation results show that not only the range resolution but the resolution capability of multi-object is largely improved.

9 Radar Signal Denoising Via Adaptive Iterative Sparsity Decomposition

FAN Fuhua

2013(6):34-37.

[Abstract](4718) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
Sparse decomposition is effective in separating signal and noise, and it can be used to remove noise. In this paper, a redundancy match dictionary is designed for radar echo signal sparse representation, and the signal sparsity is equal to the detecting target number. As the stop threshold of the sparsity adaptive matching pursuit(SAMP) algorithm is not applicable for sparse decomposition in low signal to noise ratio(SNR) conditions, the iteration adaptive matching pursuit(IAMP) algorithm is proposed using normalized residual difference as stop condition, making sparse decomposition adaptively stop according to noise level. Signal sparsity estimation is implemented by way of successive approximation, and much improvement on decomposition accuracy is obtained. Extensive simulation results show that the IAMP algorithm is effective in radar echo signal sparse decomposition in low SNR conditions without sparsity information, and the SNR of sparse decomposition signal is largely improved.

10 Wideband Radar Signal Denoising Method Based on Modulus Maximum

FENG Ganzhong , HE Zhiming

2013(6):38-41.

[Abstract](4662) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
Classic Mallat wavelet modulus maxima denoising method is difficult to meet the performance requirements for wideband radar signal processing because of its high degree of complexity of the procedure and the large amount of calculation. An improved modulus maxima denoising algorithm based on “path”is proposed according to the basic principles of classic WTMM, which includes adaptive threshold estimation and piecewise polynomial interpolation. Choosed LFM signal for wideband radar transmitter signal, the high-resolution image (HRRP) of a broadband radar target is denoised with the improved modulus maxima denoising method. Matlab simulation results showed that the improved modulus maxima denoising algorithm turns in a good performance of signal denoising, with which the SNR of broadband radar echos can be increased effectively and the most of target feature information can be retained.

11 Beam Position Sequence Dynamic Arrangement Algorithm of Anti-saturation-attack in Phased Array Radar

HOU Zexin , TU Gangyi , WU Shaopeng , HOU Jiao

2013(6):42-45.

[Abstract](4489) [HTML](0) [PDF 0.00 Byte](3)

Abstract:
For the problem of phased array radar's limited resources in saturation-attack, a beam position sequence dynamic arrangement algorithm based on target detection probability calculation under guidance of target's cuing information is presented. This algorithm divided the guide-searching space based on target's cuing information and boundary constraint conditions. Then the beam position arrangement model is chosen by the task's type, the probability of target discovery of different beam positions is calculated.The dynamic beam position search sequence model is constructed through pre-estimating the radar's resources to ensure the number and sequence of the beam position's irrational under the principle of maximizing the probability of target discovery. The simulation results show that the algorithm is effective to reduce the phased array radar resources requirements, and that the phased array radar's ability to detect and track the multi-target in saturation-attack case has been improved.

12 Design of the Mismatch-filter for Long M Sequences and Its Performance Analysis

WANG Zhiguang , HE Qiang , HAN Zhuangzhi , CUI Peipei

2013(6):46-49.

[Abstract](4699) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
Long M sequences have large time-bandwith products and LPI have advantage in the radar confront, but the development of long M Sequences are blocked because of its high time sidelobes. The pesk sidelobe level is successfully suppressed by the mismatch filter in time dominate. But the performance's variations of mismatch filter that based on SNR and Doppler frequence is unknown. At last, the influence of the SNR and Doppler frequence for the mismatch filter is analysed in this paper, and there is a conclution that the mismatch filter would have a good job while the environment has a high SNR.

13 Implemenation of the Microwave Anechoic Chamber Automatic Measuring System Based on VISA and Mint

LI Ruiyang , WEI Gao , HAN Xu , FU Li

2013(6):50-53.

[Abstract](4674) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
In order to realize efficient automatic antenna and RCS measurement, a microwave anechoic chamber automatic measurement system has been established, using the computer to control the vector network analyzer and the test turntable. In visual C++ development environment, the multithread technology is used to combine the vector network analyzer with the test turntable. The vector network analyzer is auto-controlled by VISA and SCPI command; the test turntable is auto-controlled by Mint ActiveX control technology. The methods are easy to efficiently synchronize the two devices. The actual measurement shows that the system is easy to control, and has high measurement efficiency, high precision, and high automaticity. The controlling method has broad application prospects for it has good universality and is easy to expand.

14 Fractal Absorbing Body Design and Its Application in Microstrip Antenna

SHANG Kai , CAO Xiangyu , GAO Jun , YANG Huanhuan , ZHENG Qiurong

2013(6):54-57.

[Abstract](4641) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
A metamaterial absorber based on hilbert fractal structure is designed with miniaturization,slim, high absorptivity and no surface ullage layer. Its unit size is only 0. 071λ, the thickness is about 0. 02λand the absorber can exhibit absorption of 99. 3%. It is conformed on microstrip antenna to preparation of a novel metamaterial antenna. Compared with the conventional microstrip antenna, the proposed antenna has a obvious monstatic and bistatic radar cross section reduction at the working frequency band.the greatest decrement can amounted to 7. 2 dB,while the radiation performance is kept, which proves that the absorber had an excellent absorptivity. The simulation and measured resultes are in good agreement ,indicating that the absorbing body can be applied to microstrip antennas to achieve in-band stealth.

15 Design of Control System for Ferrite Phase Shifter

TANG Ningsheng

2013(6):58-60.

[Abstract](4602) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
First of all. A control system for ferrite phase shifter is described, which contains beam-steering and phase shifter driver circuit. Then from the viewpoint of project design, a design method of beam-steering circuit based on FPGA and the relationship between bits of the phase shifter and unit pulse wide are introduced in detail. And finally the work principle of phase shifter and the components of phase shifter driver circuit are demonstrated.

16 Test and Analysis of Wireless USB System on UWB Propagation Channel

YANG Runfeng , GAO Ye , LI Mingzhao

2013(6):61-64.

[Abstract](4671) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
Wireless USB system is regarded as one of the key technologies for the next generation of wireless personal area network and it has been standardised by MB-OFDM based on ultra-wideband (UWB) radio platform. The proposed Wireless USB system has been tested in 4 different UWB propagation channels with setting 100 channel realizations per channel. Experimental results show that the proposed system can be achieved indoor multipath propagation performance of 10 meters at low data rate 200 Mb/ s and 4 meters at high data rate 480 Mb/ s, which has met the requirement of high speed wireless personal network technology.

17 Design of 2. 2 kW SSPA Module in S Band ATC Radar

FAN Ningsong , XIA Da , HE Hui

2013(6):65-68.

[Abstract](4662) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
Differed with the design of traditional power amplifier, power amplifiers of air traffic control (ATC) radar take on high power and intelligence. The design of power amplifier module in ATC radar is taken as an example. The key problems such as the design of transmitter chain, BITE function, cooling system, replacement on-line, electromagnetic compatibility (EMC), and so on. Some solutions of the key design problems of high power intelligent amplifier module in ATC radar are provided. These solutions have already been used in the ATC radar transmitter and have wide prospect in engineering application.

18 Mathematical Modeling of Cross-eye Jamming

CAO Fei , LIU Qingyun , XIN Zengxian

2013(6):69-72.

[Abstract](4565) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
A rigorous mathematical analysis of cross-eye jamming in a radar system scenario and an expression for the induced angular error due to the cross-eye jammer are presented. The simulation results show that there is a Doppler difference between jamming and target return. The Doppler difference increases with the decrease of the distance between the monopulse radar and the platform protected by cross-eye jammer. When the power of target return is not small enough with respect to the power of jamming transmitted by one of the two sources, maybe the sign of the indicated angle is uncontrollable. The simulation results also show that al though the cross-eye gain is maximized if two jamming signals are equal amplitude and antiphase. Though the cross-eye gain is maximized if two jamming signals are equal anplitude and antiphase, this condition shouldn't be satisfied in practice

19 Design of a Digital T / R Module Automatic Measuring System

PEI Ying

2013(6):73-76.

[Abstract](4592) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
Digital T/ R module is core of digital active phased array antenna, its automatic measuring of different parameters is very important. The T/ R module automatic measuring system is introduced in this paper, including equipment composition, software design, test method and procedure, etc. By using the system, the different parameters of digital T/ R module can be measured automatically. The system has been applied to debug various radar systems, and the application show that the system have shortened cycle to test radar greatly and have improved process to debug the radar receiver.

20 Modeling and Analysis of Errors on Array Hardware-in-the-loop RF Simulation System

LI Hua , ZHOU Jianjiang , GONG Shufeng , BEN De

2013(6):77-81.

[Abstract](4583) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
Array hardware-in-the-loop simulation system is an ideal environment for weapon direction system carrying out the antijamming trial. It plays an important role in the development of the weapon direction system. The accuracy of the target location is a critical indicator of the array hardware-in-the-loop simulation system. Error factors and the reasons of error are analysed from many aspects, such as basement infrastructure, steel structure, array antenna, microwave link, calibration system and others correlated, which all may arouse the accuracy of the target location. What's more, the corresponding improvement actions are proposed.

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