Issue 11,2017 Table of Contents

1 Review of the Mapping Parameters of InSAR Instruments

WU Danqin , LIU Guoxiang , LI Tao , CHEN Qianfu , GAO Xiaoming

2017(11):1-6.

[Abstract](5357) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
InSAR has been proven useful to calculate high-precision digital elevation model (DEM) using single look complex (SLC) image pairs. Kinds of airborne and spaceborne InSAR instruments have been produced and used in surveying and mapping application with high precision positioning capability. And SRTM and TanDEM-X are the most famous two. Taking SRTM and TanDEM-X for in-stance, parameters and applications are introduced using InSAR to map the earth topography in this paper. It's expected to provide references for the design of China domestic InSAR sastellites.

2 A Study on Synthetic Electronic Instrument of High Resolution SAR

JIANG Tao , LI Minhui , LIU Jin

2017(11):7-10.

[Abstract](5557) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
A high resolution airborne synthetic aperture radar (SAR) of the big azimuth scanning angle is introduced and the technique of synthetic electronic instrument is studied deeply in allusion to high bandwidth generating, multi-subbands receiving, high original phase stability of wideband pulse signal and so on. Later, anticipative phase-amplitude characteristics and pulse compression characteristics are analysed,the design essential and technical capability of synthetic electronic instrument of high bandwidth transmitting and multi-subbands receiving have been validated by airborne flight experiment and high quality SAR image after imaging processing.

3 Analysis of Airborne Passive Location Precision Based on Multi-static Cooperation

LI Chaoqiang , LI Xiaobo , ZHANG Jing , CAO Chen

2017(11):11-14.

[Abstract](5406) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
A multi-static cooperative airboren passive location system is proposed in this paper. This system can locate the target by locating the measured in formation of the same target in the airspace. The system can overcome the shortcoming of short baseline of single static, and realize high-precision location. The GDOP positioning precision and the response time of different positioning methods of the single-/multi-static systems are analyzed. The simulation results show that the response speed of the system can be increased by more than ten times.

4 Fast Target Recognition of Key Radar Electronic Target

ZHU Yongcheng , PAN Jifei , JIN Tianxiang , SHEN Jiahuang , LIU Xin

2017(11):15-20.

[Abstract](5469) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
Aiming at the problem that the existing radar countermeasure reconnaissance system is less targeted for the specific radar electronic target recognition, a fast target recognition method of radar target is presented. Parallel processing flow is adopted, which can process multiple radar objects simultaneously. Firstly, a small sample pulse sequence is constructed by using the prior information of radar electronic target. Secondly, a new algorithm is realized which can match the radar target quickly based on the small sample pulse sequence. This method bypasses the sorting of traditional radar signals. This method not only has good recognition effect on the key radar signal, but also improves the processing speed effectively. Finally, a computer simulation has been carried out. Both theoretical analysis and simulation results show that the fast target recognition algorithm can effectively overcome the shortcomings of the less-targeted identification methods and rigid processing flow of the existing radar emitter identification method.

5 Performance Analysis of STAP with Arbitrary Synthetic Structure of Transmitted Waveform for Airborne MIMO Radar

GUO Yiduo , ZHANG Yongshun , GONG Jian , JIN Hubing

2017(11):21-26.

[Abstract](5484) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
Signal-clutter-noise ratio out ( SCNRout) is an important index that decides the performance of space time adaptive processing ( STAP) in airborne multiple input multiple output ( MIMO) radar, but its theoretic analytic formulation can not be given precisely for the existed STAP algorithms. To solve this problem, the precise theoretic analytic formulation of MIMO STAP algorithm is researched with arbitrary synthetic structure of transmitted waveform. Firstly, based on the direct relationship between the cross-correlation matrix of transmitted waveform and the performance of MIMO STAP, the theoretic analytic formulations of SCNRout, which are used to judge the STAP performance of airborne MIMO radar are deduced. Then based on the comparison and analysis on the theoretic analytic formulations, the STAP performances character of ideal MIMO radar, MIMO phased array ( PA) radar and PA radar are represented through arbitrary synthetic structure of transmitted waveform. Finally, the simulations indicate that the deduced theoretic analytic formulations are consistent precise with the simulated results, and the superiority of MIMO STAP is demonstrated and analyzed. The deduced theoretic analytic formulations are significant for the design of optimal transmitted waveform.

6 A Method of Range and Velocity Measurement for MFSK Automobile Radar

JIANG Liubin , SONG Yongkun , CHE Li

2017(11):27-33.

[Abstract](5444) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
In view of the questions that traditional linear frequency modulated (LFM) continuous wave and frequency shift keying (FSK) wave are existing in automobile radar system, a multiple frequency shift keying wave(MFSK) radar measurement method combined with LFM and FSK wave is discussed in this paper. Firstly, the measurement principle of MFSK system is deduced theoretically, then all phase FFT (apFFT) algorithm is used to improve the phase estimation accuracy. The system signal processing method is designed by apFFT algorithm, then the performance of the system is compared and analyzed. Simulation results show that the designed MFSK automobile radar system has high measurement resolution, it could measure unambiguously and avoid any ghost target situation. In a word, the performance of this algorithm could meet the requirements of automobile radar measurement system.

7 Dynamic Programming Track before Detect Algorithm Based on Neural Network

ZHANG Peinan , ZHENG Jian , ZENG Zebin , GUO Yunfei

2017(11):34-38.

[Abstract](5138) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
In order to address the problem of detecting and tracking low signal-to-noise-ratio targets, a neural network based dynamic programming track-before-detect (NNDP-TBD) algorithm is proposed. First, the training samples are selected from the raw measurements, and the weights of neural network are trained using these samples. Second, all raw measurements are classified into two categories with the clustering analysis. The amplitudes of measurements which belong to the clutter set are set to zero. That of measurements which belong to the target set, however, are increased by a scaling factor. Third, a multiple criteria decision making based backtracking algorithm is proposed to extract again the initial tracks set, which helps to decrease the acceptance probabilities of the false tracks. Simulation results verify the effectiveness of the proposed method.

8 A Study on Adaptive Signal Processing Frameworks for Radar Reconnaissance

WANG Pei , QIU Zhaoyang , ZHU Jun , TANG Bin

2017(11):39-44.

[Abstract](5486) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
To satisfy the requirements of adaptive signal processing for radar reconnaissance in modern complex electromagnetic environment, several adaptive signal processing frameworks are studied based on the modeling and analysis of radar reconnaissance problem. For signal processing modules and algorithms, structures such as adaptive feature detection and analysis frameworks, and adaptive signal deinterleaving framework are designed to enhance the capabilities of processing newly emerging low probability of recognition signals. For signal processing flow of the reconnaissance system, the capabilities of dynamic situation awareness are expanded based on corresponding adaptive tracing and prediction frameworks. For the cooperation between a radar reconnaissance system and other subsystems, adaptive cooperation frameworks are designed to work together with a radar system and a jamming system respectively for different requirements, so that the overall operational effectiveness is improved. It is assumed to provide some helpful ideas for further researches in adaptive radar countermeasures.

9 Direction-of-arrival Estimation Algorithm of Sparse Fusion in Spatial Domain and Performance Analysis

JI Zhengyan , CHEN Hui , ZHANG Jiajia , LI Shuai , LU Xiaofei

2017(11):45-52.

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

Abstract:
In the estimation of direction-of-arrival (DOA) based on compressive sensing, the construction of manifold matrix is the foundation of subsequent estimates. Firstly, this paper proposes the theoretical analysis about orthogonality of adjacent vector in manifold matrix. The results about the analysis show that the manifold matrix with equal angle interval is superior to that with equal sine interval in normal direction, and the manifold matrix with equal sine interval is superior to the one with equal angle interval in beam direction in the end. Respectively they both perform a better DOA estimation. Then this paper deduces systematically critical value of equal sine interval and equal angle interval, and discusses the influence of the number of array element and division number to the orthogonality. On this basis, a better sparsity model is designed, and a DOA estimation algorithm named sparse fusion in spatial domain (SFSD) is proposed based on the combination of equal sine interval and equal angle interval. Compared with the two other DOA estimation algorithms, the proposed algorithm has the better DOA estimation robustness, lower signal-to-noise ratio threshold and higher estimation precision. Finally, the superiority of the theoretical model and the efficiency of the algorithm are validated by computer simulation.

10 Singleobserver Bearingonly Tracking Method Based on Joint Estimation of Measurements and Prediction

SHENG Hu , ZHANG Yuan , ZHAO Wenbo , ZHANG Xiong , AN Zhen

2017(11):53-56.

[Abstract](5151) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
In this paper, a modified best linear unbiased estimation (BLUE) filter is proposed for single-observer bearing-only system. Though widely used in radar target tracking, conventional BLUE filter requires the full set of nonlinear measurements to construct converted measurements in Cartesian coordinate. Single-observer bearing-only system only provides bearing measurement, so it can't use BLUE filter directly. To solve this problem, the target state prediction is used to construct the predicted range. After deriving the error statistics of the predicted range, the predicted range and bearing measurement are combined to form the converted measurements, then relevant filter model for single-observer bearing-only system is derived. Simulation results verify the proposed BLUE filter is superior to other algorithms in performance and computational complexity, which makes it potentially competitive.

11 A Study on the Ambiguity and Non-solution Areas of Passive TDOA Location System

WANG Ting

2017(11):57-62.

[Abstract](5424) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
The basic principle of 2D and 3D TDOA location system is introduced first. Based on this principle, simulation and analysis is carried out for the ambiguity and non-solution phenomena of the 3-sation 2D location system and 4-sation 3D TDOA location system. According to the results of simulation, the correlation of the ambiguity and non-solution areas is received with the placement of stations, target height and measuring error. Finally, some effective methods are proposed to solve the problems such as the ambiguity and non-solution phenomena.

12 The Verification of Precession Period Extraction Method of Ballistic Missile Based on RCS Sequence

YAO Xiaoqiang , HOU Zhisen , GUO Xiangke

2017(11):63-67.

[Abstract](5291) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
For the problems of the traditional method of micro feature extraction, such as low accuracy of data source, not considering the warhead translatory motion, the distributed authentication system of feature extraction is built and the commonly used precession period extraction method is verified. Firstly, the motion characteristic of the middle warhead and warhead radar cross section (RCS) template is generated by using the software of STK and FEKO. Secondly, the high-precision RCS sequence of warhead during middle course is generated by compositing the movement characteristics and the RCS template. Finally, the extraction effect of the common algorithm is verified based on the generated sequence. The simulation shows that the accuracy of pecession period extration method is not only subject to noise intensity but also closely related to the average aspect angle,the ACF algorithm gains more than two times accuracy than the CAUTOC algorithm when the average aspect angle is less than 35°.

13 Analysis of Maximum Efficiency of High Power Microwave Bomb

ZHU Minpeng , HOU Deting , CHEN Dan , JIANG Teng

2017(11):68-72.

[Abstract](5332) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
The concepts of "waist" and "damage cross section" of high power microwave bomb (HPMB) power density surface are presented. The maximum damage area analysis procedure of the HPMB is established. The expression of the equal power density surface is determined by combining the power, gain and half width of the microwave pulse. By using equivalent surface modeling of equal power density surface, the error of this method is smaller compared with the traditional conical modeling. The area of the damage cross section is analyzed by using the fixed microwave beam and rotating ground coordinate system. Combining the specific HPMB model and the radar equipment model, the maximum damage area of the HPMB at different angles against the radar equipment, the corresponding microwave bomb detonation height and the best match angle of the microwave bomb to the radar net attack are analyzed and the feasibility of the method is verified.

14 A Study on Churning Torque of Radar Pedestal Reduction Gearbox at Low Temperature

CHEN Cheng

2017(11):73-76.

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

Abstract:
The excessive resistance moment problem of azimuth reduction gearbox encountered in low-temperature experiment of a meteorological radar is focused on, variety of gearbox power loss models proposed by domestic and foreign literature are compared. The mathematic model of the churning torque of the gearbox at low temperature is built by least squares fitting. The resistance torque that the motor needs to overcome and the corresponding output current are obtained under the different speeds and temperature conditions, which can guide further motor re-selection and the system design.

15 Design of a Single-chip Active Switch Filter Bank

XIE Shushan

2017(11):77-79.

[Abstract](5223) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
The trend of integration development is one of the important trends of radio frequency (RF) system. A common combination unit of active switch and passive filter bank has been widely used in the RF integration broadband system. Usually,because of the different manufacturing processes, the processing technology and material composition are different, so the high density integration of the two must be with the help of other media. Based on the progress of integrated passive device technology and system in package technology,a S band single-chip active switch filter bank design, with size of 7.0 mm×5.5 mm×1.14 mm, is introduced in this paper,including integrated blocking capacitance and power decoupling capacitors. The miniaturization and light weight have been achieved at the same time, and its technical application will be convenient.

16 A Kind of Full Duplex and High Performance T/R Module Operating on S Band

DONG Zhelun , HAN Guodong , CHEN Jianmin

2017(11):80-84.

[Abstract](5349) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
A kind of full duplex T/R module operating on S band is designed. The module has series of characteristics: high isolation, low noise figure and continuous wave output-power. According to the requirement, the receiving and transmitting channel are designed and the key components are chosen to analyze the performance of the module. The module is fabricated and tested. The output power of the transmitting channel can be up to 1 W,the gain of the receiving channel is more than 50 dB,the noise figure is less than 2. 1 dB,the isolation is more than 90 dB and dimension is 50 mm×40 mm×12 mm. The modules can be applied in satellite communication and navigation fields.

17 A Study on Antenna Pattern Based on MIMO Radar Signal Model

WANG Ning , CHEN Yi , YU Junpeng , LI Yuanji , ZHU Huan

2017(11):85-89.

[Abstract](5304) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
Based on the signal model of the multiple-input multiple-output (MIMO) radar, the antenna patterns of different type radar systems are compared. Firstly, the signal model of the MIMO radar is built, and the antenna pattern of the model is obtained by deriving the method of beamforming. Then, the antenna patterns of MIMO radar, phased array radar and synthetic aperture radar are analyzed and compared. Finally, simulation result is given and the characteristics of different type radar systems'antenna patterns are summarized.

18 False Track Discrimination of Air Surveillance Radar Based on Speed Difference Detection

HUANG Siyuan , LIU Dongsheng

2017(11):90-96.

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

Abstract:
In order to distinguish the false track produced by digital radio frequency memory to air surveillance radar, a novel method is proposed by analyzing the change of speed between points of the track. According to the different principles of generating track between true targets and jammer on radar plan position indicator display, the discrimination issue is determined to be the problem of speed difference detection, and the formula is deduced. MATLAB is used to write simulation and discrimination procedures for calculating the judge threshold, and the method is verified with the experimental results of simulation. This method can provide a new solution to distinguish the false track.

19 Tactics Application of Dual-source Jamming in Single Naval Ship Anti-missile Defense Operation

DU Jiandong , KE Kai

2017(11):97-100.

[Abstract](5257) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
The theory of dual-source jamming was presented in the paper. Based on the physical truth of the new phased array jamming equipment, two kinds of structuring methods and the tactics application of the non-coherent dual-source jamming were proposed. By means of the formula derivation and the theoretical calculation of the structuring, feasibility and service conditions for single-ship settings were especially elaborated. The results showed that the dual-source jamming using phased array system equipment was able to be effectively used in the unborn anti-missile defense operation for the navy ship.

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