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Robust mismatched filtering algorithm for passive bistatic radar using worst-case performance optimization Research Articles

Gang Chen, Jun Wang,chengang_xidian@163.com,wangjun@xidian.edu.cn

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 7,   Pages 963-1118 doi: 10.1631/FITEE.1900150

Abstract: detects targets by exploiting available local broadcasters and communication transmissions as illuminators, which are not designed for radar. The signal usually contains a time-varying structure, which may result in high-level range ambiguity sidelobes. Because the mismatched filter is effective in suppressing sidelobes, it can be used in a . However, due to the in the reference signal, the sidelobe suppression performance seriously degrades in a system. To solve this problem, a novel algorithm is developed using . In this algorithm, the influence of the low energy level in the reference signal is taken into consideration, and a new cost function is built based on . With this optimization, the mismatched filter weights can be obtained by minimizing the total energy of the ambiguity . Quantitative evaluations and simulation results demonstrate that the proposed algorithm can realize sidelobe suppression when there is a low-energy reference signal. Its effectiveness is proved using real data.

Keywords： 外辐射源雷达；距离副峰；低信噪比；失配滤波；最差性能最优    

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Joint compressed sensing imaging and phase adjustment via an iterative method for multistatic passive radar None

Jue WANG, Jun WANG

Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 4,   Pages 557-568 doi: 10.1631/FITEE.1601423

Abstract: The resolution of the multistatic passive radar imaging system (MPRIS) is poor due to the narrow bandwidth of the signal transmitted by illuminators of opportunity. Moreover, the inaccuracies caused by the inaccurate tracking system or the error position measurement of illuminators or receivers can deteriorate the quality of an image. To improve the performance of an MPRIS, an imaging method based on the tomographic imaging principle is presented. Then the compressed sensing technique is extended to the MPRIS to realize high-resolution imaging. Furthermore, a phase correction technique is developed for compen-sating for phase errors in an MPRIS. Phase errors can be estimated by iteratively solving an equation that is derived by minimizing the mean recovery error of the reconstructed image based on the principle of fixed-point iteration technique. The technique is nonparametric and can be used to estimate phase errors of any form. The effectiveness and convergence of the technique are confirmed by numerical simulations.

Keywords： Multistatic passive radar     Compressed sensing     Phase adjustment     Fixed-point iteration technique    

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Doppler ambiguity analysis and suppression for LTE-based passive bistatic radars Research Articles

Luo Zuo, Jun Wang, Gang Chen,zuoluo_xidian@163.com,wangjun@xidian.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 8,   Pages 1140-1152 doi: 10.1631/FITEE.2000143

Abstract: In this study, we provide a detailed analysis of the frequency division duplex long term evolution downlink (FDD LTE DL) signal for passive bistatic radars that use the signal as an illuminator of opportunity. In particular, we analyze the cross-ambiguity function and illustrate its undesired deterministic peaks in the Doppler dimension due to the specific structure of the FDD LTE DL signal. A new adaptive mismatched filtering method is proposed for pre-processing the original reference signal to suppress these undesired deterministic peaks in the . The effectiveness of our proposed method is demonstrated via simulations following robustness analysis, showing that all undesired peaks are suppressed below −40 dB, with only 1.7 dB reduction in the main peak.

Keywords： 外辐射源雷达（PBR）；长期演进（LTE）；多普勒模糊副峰；距离多普勒二维联合    

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High-accuracy target tracking for multistatic passive radar based on a deep feedforward neural network Research Article

Baoxiong XU, Jianxin YI, Feng CHENG, Ziping GONG, Xianrong WAN,jessiexu@whu.edu.cn,jxyi@whu.edu.cn,cwing@whu.edu.cn

Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 8,   Pages 1214-1230 doi: 10.1631/FITEE.2200260

Abstract: In radar systems, errors are mainly from motion models and nonlinear measurements. When we evaluate a tracking algorithm, its is the main criterion. To improve the , in this paper we formulate the tracking problem into a regression model from measurements to target states. A tracking algorithm based on a modified (MDFNN) is then proposed. In MDFNN, a is introduced to describe the temporal sequence relationship of the input measurement sequence, and the optimal measurement sequence size is analyzed. Simulations and field experimental data of the show that the accuracy of the proposed algorithm is better than those of extended Kalman filter (EKF), unscented Kalman filter (UKF), and recurrent neural network (RNN) based tracking methods under the considered scenarios.

Keywords： Deep feedforward neural network     Filter layer     Passive radar     Target tracking     Tracking accuracy    

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Frequency-hopping transmitter fingerprint feature recognition with kernel projection and joint representation Research Articles

Ping SUI, Ying GUO, Kun-feng ZHANG, Hong-guang LI

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 8,   Pages 1133-1146 doi: 10.1631/FITEE.1800025

Abstract: Frequency-hopping (FH) is one of the commonly used spread spectrum techniques that finds wide applications in communications and radar systems because of its inherent capability of low interception, good confidentiality, and strong antiinterference. However, non-cooperation FH transmitter classification is a significant and challenging issue for FH transmitter fingerprint feature recognition, since it not only is sensitive to noise but also has non-linear, non-Gaussian, and non-stability characteristics, which make it difficult to guarantee the classification in the original signal space. Some existing classifiers, such as the sparse representation classifier (SRC), generally use an individual representation rather than all the samples to classify the test data, which over-emphasizes sparsity but ignores the collaborative relationship among the given set of samples. To address these problems, we propose a novel classifier, called the kernel joint representation classifier (KJRC), for FH transmitter fingerprint feature recognition, by integrating kernel projection, collaborative feature representation, and classifier learning into a joint framework. Extensive experiments on real-world FH signals demonstrate the effectiveness of the proposed method in comparison with several state-of-the-art recognition methods.

Keywords： Frequency-hopping     Fingerprint feature     Kernel function     Joint representation     Transmitter recognition    

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Generalized labeled multi-Bernoulli filter with signal features of unknown emitters Research Article

Qiang GUO, Long TENG, Xinliang WU, Wenming SONG, Dayu HUANG

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 12,   Pages 1871-1880 doi: 10.1631/FITEE.2200286

Abstract:

A novel algorithm that combines the (GLMB) filter with signal features of the unknown emitter is proposed in this paper. In complex electromagnetic environments, emitter features (EFs) are often unknown and time-varying. Aiming at the unknown feature problem, we propose a method for identifying EFs based on of data fields. Because EFs are time-varying and the probability distribution is unknown, an improved algorithm is proposed to calculate the correlation coefficients between the target and measurements, to approximate the EF likelihood function. On this basis, the EF likelihood function is integrated into the recursive GLMB filter process to obtain the new prediction and update equations. Simulation results show that the proposed method can improve the tracking performance of multiple targets, especially in heavy clutter environments.

Keywords： Multi-target tracking     Generalized labeled multi-Bernoulli     Signal features of emitter     Fuzzy C-means     Dynamic clustering    

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Impact of Recent Regional Wars on Requirements of Ground based Air Defense Radars

Peng Jiating

Strategic Study of CAE 1999, Volume 1, Issue 2,   Pages 19-23

Abstract:

In light of tasks creating before ground based air defense radar in recent regional conflicts, this paper outlines features of modern miscellaneous targets as well as the combat environment and ECCM environment of air defense radars, and analyzes briefly the position and function of ground based mid and low altitude defense systems in modem air defense. The author believes that these air defense systems can play an important role in modem air defense and would be the preferred weapon especially against such targets as the cruise missile, attack helicopter, lowaltitude aircraft (including stealthy ones) and anti-radiation missile. The article concludes the new requirement of ground based mid and low altitude defense radars, mainly including good ECCM performance, good low altitude property, the required capability of small target detecting for weapon systems, capability of rapid search and acquisition. The realizability of these requirements in ground based mid and low altitude defense systems is also discussed in brief in this paper.

Keywords： low altitude     air defense radar     anti-stealth     anti-cruise missile     anti-antiradiation missile    

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China Microwave Remote Sensing Technology Facing to 21st Century

Jiang Jingshan

Strategic Study of CAE 1999, Volume 1, Issue 2,   Pages 78-82

Abstract:

Microwave Remote Sensing has developed rapidly during last decades, and become a leading method in remote sensing techniques, since its unique features, capability to penetrate clouds and to some extent rain due to its independence from the sun as a source of illumination and other important properties different from visible and IR frequency bands. Microwave remote sensing became a key means for obtaining information from ocean, atmosphere and land in global scale. The frequency range using for microwave remote sensing is extending to millimeter and submillimeter bands.To meet the wide requirements, China enhanced the microwave remote sensing research during last two decades and has got many achievements.In this paper, the microwave remote sensing activities, its achievement, and the state of the arts are described, some strategic suggestions in future development given. Some concepts of space borne system are discussed, and the research areas to which should give priority to develop in national R&D plan suggested. A new concept of remote sensing —a comprehensive electromagnetic sensing system has been suggested to improve remote sensing capability.

Keywords： microwave remote sensing     space technology     electromagnetic wave     radar     scatterometer     altimeter     radiometer    

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Active and passive microwave remote sensing technology of the HY-2A ocean satellite mission

Jiang Xingwei,Lin Mingsen,Song Qingtao

Strategic Study of CAE 2013, Volume 15, Issue 7,   Pages 4-11

Abstract:

The paper summarized the capabilities, performance, and technical characteristics of the 4 payloads onboard the HY-2A satellite including radar altimeter, microwave scatterometer, scanning microwave radiometer and microwave calibration radiometer. The HY-2A satellite is marked as a significant breakthrough for microwave remote sensing technology of China, a milestone for China's own ocean dynamic environment satellite that plays a crucial role in maritime applications, and a role model for China's future ocean satellite missions.

Keywords： HY-2A satellite     microwave remote sensing     ocean remote sensing     radar altimeter     microwave scatterometry     microwave radiometry    

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Study on Strengthening Technique with Prestressed PBO Fiber Sheets

Wu Zhishen,Iwashita Kentaro,Niu Hedong

Strategic Study of CAE 2005, Volume 7, Issue 9,   Pages 18-24

Abstract:

The application of externally bonded fiber reinforced polymer (FRP) laminates to the exposed faces of concrete members provides an innovative and efficient rehabilitation method for strengthening and upgrading structurally inadequate or functionally obsolete concrete structures. However, FRP laminates unlike the cold worked steel exhibit elastic-rupture behavior and also the limited bond capacity of FRP-concrete interface often fails the retrofitted system in an undesirable brittle manner, which leaves FRP material unused with more reserves. Moreover, enhancements in cracking and yield load due to FRP bonding are not significant. To take full advantage of FRP laminates, more gains can be achieved by prestressing the fibers prior to bonding them. Traditional practice is to pretension fiber sheets impregnated with adhesive or FRP plate, which is time-consuming, difficult to apply in the field and ensure a perfect bond at the interface. A newly-developed PBO fiber possesses high modulus, high strength and higher energy absorption capability as compared to carbon and aramid fibers, and PBO fiber sheet can be pretensioned to over 70% of its tensile strength without being impregnated with adhesive. All these make such material suitable to be prestressed for strengthening concrete structures. Based on the experiments and theoretical studies, a comprehensive strengthening method with prestressed PBO sheet is established including concept, working principle and corresponding countermeasures, whose strengthening effect is validated by both laboratory and field experiments.

Keywords： fiber reinforced polymers (FRP)     PBO fiber sheet     retrofit/repair     bond     prestressing     anchorage    

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Study on motion compensation method for MMW Chirp － SF radar

Wang Guili,Li Xingguo

Strategic Study of CAE 2008, Volume 10, Issue 7,   Pages 184-187

Abstract:

MMW Chirp - SF radar is a kind of radar to get high range resolution, but the problem of rangevelocity coupling is serious. So it is necessary to carry out the motion compensation in order to increase the range resolution of moving target. This paper puts forward a velocity measurement method compounding the Pulse Doppler velocity measurement and the time-domain correlation method based on Chirp - SF signal. The simulations results show that this method can be used to measure velocity accurately with simple arithmetic and high speed.

Keywords： MMW radar     Chirp - SF     Doppler     motion compensation    

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China New TT&C System

Shi Changjie

Strategic Study of CAE 1999, Volume 1, Issue 1,   Pages 63-66

Abstract:

This paper has introduced a new Chinese TT&C system. This system includes telemetry, remote control, orbit measurement sub-systems. It has passed Reception Appraisal Meeting and got higher level appraisal. It can be used under mirror reflection enviroment condition to overcome the multipath fading effect of low height flight target and can stable capture & track target with high reliability. It also may be used for other conditions. This paper has introduced the principle of operation with the brief block diagrams. It introduces the technical features which includes the methods to overcome the multipath fading, the methods to get high reliability. This system is very flexible and may be suitable to other enviroment conditions. On the target there is a transponder. This transponder has overcome the difficulty of high level and low level signals transmitting over the same channel. This transponder has used many technologies to reduce diamension and it has overcome the low phase noise problem of crystal. This system has used new open feature telemetry system. In this paper has given important data of transmission channel. At the end of this paper it has given： the end user test result, the appraisal of the Receiption Appraisal Meeting. This system is the highest level system of the same kind low angle receiving system in China.

Keywords： telemetry     remote control     orbit measurement    

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Design new ideas and engineering practice of high-pressure water-rich fault “outside block and inside strenghthen grouting”

Zhang Minqing,Zhang Mei

Strategic Study of CAE 2009, Volume 11, Issue 12,   Pages 26-34

Abstract:

Qiyue Mountain Tunnel F11 fault on Yichang-Wuanzhou Railway is formed by breccia, broken rocks and fault gouge composition. It is rich in high-pressure water, with the biggest single whole water inflow of 1 800 m3/h and water pressure of 2.5 MPa. In earlier stage, F11 fault followed the principle of "mainly blocking up and limiting discharge"  and grouted the whole cross-section, the construction quantity was huge and the progress was slow. To overcome F11 fault early, the construction technology of "grouting to make solid, using water segrating, excavating and sealing quickly, strengthening monitoring and managing comprehensively"  was proposed and whole cross-section grouting was changed into "outside block and inside strengthen grouting" . The common design for high-pressure water-rich fault is thicker reinforced ring and stronger reinforced body. While "outside block and inside solid grouting"  assumes the distribution of surrounding rock, water quantity and pressures is uneven, then finds out weak water area and strong water area through advanced prospecting holes, and adopts normal grouting for weak water area and strengthened grouting for strong water area, following the principle of "blocking cracks to reduce water quantity, strengthening supporting rock and improving strata" . Firstly, unconstrained grouting is used through area location holes to effectively control water quantity in strata, then grouting is adopted abiding by the principle of "appropriate drawing pace, blocking water flow, from outside to inside, finding water source by interval holes, and adding holes in necessary areas" . Engineering practices show that "outside block and inside solid grouting"  can effectively blocking water and strengthen. The grouting holes and grouting quantity of "outside block and inside solid grouting"  are 50 % less than those of whole cross section grouting, and the grouting speed is 80 % higher when water quantity is large, at least 50 % higher in usual condition.

Keywords： high-pressure water-rich fault     unevenness     blocking water and strengthen by grouting     outside block and inside solid grouting     innovation    

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Stepped frequency chirp signal imaging radar jamming using two-dimensional nonperiodic phase modulation Research Article

Qihua WU, Feng ZHAO, Tiehua ZHAO, Xiaobin LIU, Junjie WANG, Shunping XIAO

Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 3,   Pages 433-446 doi: 10.1631/FITEE.2200298

Abstract: obtains high-resolution radar images by synthesizing multiple narrowband chirp pulses. It has been one of the most commonly used waveforms due to its lower demand for radar instant bandwidth. In this paper, we propose a method using two-dimensional against imaging radar. Using the unique property of , the proposed method can generate high-level sidelobes that perform as a special blanket jamming along both the range and azimuth directions and make the target unrecognizable. Then, the influence of different modulation parameters, such as the code width and duty ratio, are further discussed. Based on this, the corresponding parameter design principles are presented. Finally, the validity of the proposed method is demonstrated by the Yake-42 plane data simulation and measured unmanned aerial vehicle data experiment.

Keywords： Radar jamming     Stepped frequency chirp signal     Nonperiodic phase modulation     Wideband radar    

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Wind profiler radar to monitor the dust weather

Wei Wenshou,Wang Minzhong,He Qing

Strategic Study of CAE 2012, Volume 14, Issue 10,   Pages 51-56

Abstract:

The Urumqi Institute of Desert Meteorology of China Meteorological Administration (CMA) carried out an atmospheric scientific experiment on the detection of dust weather using a wind profiler radar in the hinterland of the Taklimakan Desert in April 2010. Based on the wind profiler radar data obtained from this experiment, this paper analyzes the characteristics of the horizontal wind field and vertical velocity of a breaking dust weather in a desert hinterland, calculates and gives the radar echo intensity and vertical distribution of a dust storm, blowing sand and floating dust weather, and discusses the atmospheric dust counts/concentration derived from the wind profiler radar data. Studies show that a wind profiler radar is an upper air atmospheric remote sensing system that effectively detects and monitors dust. It captures the beginning and ending of a dust weather process as well as monitors the sand and dust being transported in the air in terms of height, thickness and vertical intensity. The echo intensity of a blowing sand and dust storm weather episode in Taklimakan is about -3~10dBZ while that of floating dustis -15~-3 dBZ, indicating that the dust echo intensity is significantly weaker than that of precipitation while stronger than that of clear air.

Keywords： wind profiler radar     dust weather     echo intensity     monitoring    

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Title Author Date Type Operation

Robust mismatched filtering algorithm for passive bistatic radar using worst-case performance optimization

Gang Chen, Jun Wang,chengang_xidian@163.com,wangjun@xidian.edu.cn

Journal Article

Joint compressed sensing imaging and phase adjustment via an iterative method for multistatic passive radar

Jue WANG, Jun WANG

Journal Article

Doppler ambiguity analysis and suppression for LTE-based passive bistatic radars

Luo Zuo, Jun Wang, Gang Chen,zuoluo_xidian@163.com,wangjun@xidian.edu.cn

Journal Article

High-accuracy target tracking for multistatic passive radar based on a deep feedforward neural network

Baoxiong XU, Jianxin YI, Feng CHENG, Ziping GONG, Xianrong WAN,jessiexu@whu.edu.cn,jxyi@whu.edu.cn,cwing@whu.edu.cn

Journal Article

Frequency-hopping transmitter fingerprint feature recognition with kernel projection and joint representation

Ping SUI, Ying GUO, Kun-feng ZHANG, Hong-guang LI

Journal Article

Generalized labeled multi-Bernoulli filter with signal features of unknown emitters

Qiang GUO, Long TENG, Xinliang WU, Wenming SONG, Dayu HUANG

Journal Article

Impact of Recent Regional Wars on Requirements of Ground based Air Defense Radars

Peng Jiating

Journal Article

China Microwave Remote Sensing Technology Facing to 21st Century

Jiang Jingshan

Journal Article

Active and passive microwave remote sensing technology of the HY-2A ocean satellite mission

Jiang Xingwei,Lin Mingsen,Song Qingtao

Journal Article

Study on Strengthening Technique with Prestressed PBO Fiber Sheets

Wu Zhishen,Iwashita Kentaro,Niu Hedong

Journal Article

Study on motion compensation method for MMW Chirp － SF radar

Wang Guili,Li Xingguo

Journal Article

China New TT&C System

Shi Changjie

Journal Article

Design new ideas and engineering practice of high-pressure water-rich fault “outside block and inside strenghthen grouting”

Zhang Minqing,Zhang Mei

Journal Article

Stepped frequency chirp signal imaging radar jamming using two-dimensional nonperiodic phase modulation

Qihua WU, Feng ZHAO, Tiehua ZHAO, Xiaobin LIU, Junjie WANG, Shunping XIAO

Journal Article

Wind profiler radar to monitor the dust weather

Wei Wenshou,Wang Minzhong,He Qing

Journal Article