Information

ParentUnit China Electronics Technology Group Corporation

Unit Nanjing Research Institute of Electronics Technology

PublishHouse Modern Radar Editorial Office

PrintingPlant

DomesticPublishHouse

PostID

ExternalPublishHouse

ServiceTel 025-51821080/81/83/85/86/88

Email modernradar@126.com

Address Editorial department of Modern Radar, No.8 Guorui Road, Yuhuatai District, Nanjing 210039, P. R. China

  • Current Issue
  • Online First
  • Archive
  • Most Downloaded
    Select AllDeselectExport
    Display Method:
    2021(9):1-5, DOI:
    Abstract:
    The influence of relative phase and amplitude ratio on radar resolutions has been investigated theoretically. Firstly, the echo of two targets is established in time, Doppler and angle domains, uniformly. Then, the radar resolution is defined mathematically. A novel conception of resolvable area in complex plan is brought forth to describe the influence of relative phase and amplitude
    2021(9):6-13, DOI:
    Abstract:
    It is inevitable that the radar cannot resolve multiple targets even though the radar resolution is greatly improved. Such a set of multiple targets, also called as unresolved targets, are unresolved when directly using the conventional linear processing and widespread in the radar application, e. g. air defense and anti-missile fields. Radar performance is greatly limited by the unresolved targets. In this paper, the radar resolution mechanism is given. It is deduced that the parametric model owns the super resolution capability. Then the consistence between array monopulse and maximum likelihood is analyzed. On this basis, considering the scenarios of multiple targets where the targets number is pre-known, two approaches of adaptive monopulse and four-channel monopule for accurate angle measurement of multiple targets are introduced.
    2021(9):14-19, DOI:
    Abstract:
    Towed radar active decoy(TRAD)is a typical angle deception jamming and mainlobe jamming. To improve the anti-TRAD ability of radar seeker, Firstly, the experiments on decoy identification by four-channel monopulse system are verified; Secondly, from the idea of mainlobe jamming suppression, the adaptive angle estimation algorithm is studied in this paper. Moreover, the system processing flow is proposed. The results indicate that the proposed methods are effective.
    2021(9):20-23, DOI:
    Abstract:
    A breakup event may produce large number of detectable targets for radar while tracking a space object. In a short time after the event, the breakups will stay close and keep unresolvable in radar angles which make great difficulties for target correlation and tracking, and false or unstable tracks frequently occurs during this time. In order to deal with the problem, a correction algorithm based on distance shift is proposed, simulation shows that it greatly improves the tracking results for space dense targets.
    2021(9):24-30, DOI:
    Abstract:
    Aircrafts in formation has become main combat mode in future air war. Memberships in formation are spaced closely and mutual overshadowed, which results in discontinuity in detection. Hence, how to resolve the formation targets and continually tracking under a presented radar working band has become an urgent problem. To solve this problem, this paper first induce the mean shift clustering algorithm to calculate the formation center using detection data and extract the clustering, then we adaptively adopts the censored mean level detector constant false alarm ratio (CMLD-CFAR) detection algorithm to improve the detection ability for formation targets. Lastly, by using the measurements, we obtain the histogram distribution and estimate the detection probability. Then, the formation center is used to maintain tracking. The algorithm adaptively chooses the tracking result between formation center and individual target according to the detection probability, which can make the situation clear and ensure individual target′s tracking precision. Simulation results show that the proposed algorithm greatly increases the resolving time and the resolving ability is up to 25??. Targets in formation are consecutively tracked without batch confusion, which provides a new detecting and tracking method for dense targets in formation.
    2021(9):31-36, DOI:
    Abstract:
    Unresolved targets are great challenges in radar detection. In this paper, machine learning is introduced into radar detection. The autoencoder is used to carry out unsupervised learning on how the targets are distinguished. The subspace decomposition and sparse representation methods are also combined to optimize the model, and the alternating direction multiplier method is used to solve the problem for precision and efficiency. The experimental results on holographic subsurface radar show that this method can effectively mitigate the strong clutter in radar images with the target images clear and integral. The signal-to-clutter ratio improvement of the proposed method is over 15 dB higher than that of other comparison method. Through experimental research, a promising solution is provided for the indiscernibility of targets in radar detection.
    2021(9):37-45, DOI:
    Abstract:
    Integration of radar and communication has played an increasingly important role in the military and civilian fields for decades. Its essence is to realize radar and communication functions on a unified hardware platform. The respective development trends of radar waveforms, communication waveforms and integrated waveforms are presented in this paper. The state-of-the-art of SSPARC project is also discussed. Compared to previous summaries, this paper reviews the entire trends that drive the development of integrated radar communication design, providing references for further improving related concepts and research in this field and applying to appropriate scenarios.
    2021(9):46-53, DOI:
    Abstract:
    SSPARC project is also discussed. Compared to previous summaries, this paper reviews the entire trends that drive the development
    2021(9):54-58, DOI:
    Abstract:
    The radar range resolution of conventional matched filter is limited strictly by the signal bandwidth. In order to obtain super-resolution within limited signal bandwidth, a range super-resolution imaging for radar targets using compressive sensing is proposed. he theoretical model and algorithm for range super-resolution are presented. The performance analysis on different conditions of SNR (Signal-to-Noise Ratio) is researched by simulations. Moreover, experimental results are presented. The simulation and experimental results indicate that the range super-resolution can be improved more than six-times than traditional pulse compress processing with estimation error less than -10 dB, when target′s SNR is larger than 20 dB.
    2021(9):59-62, DOI:
    Abstract:
    A time domain side lobe blanking (SLB) method which can be applied to high integration phased array has been proposed, whose working principle and working process are illustrated in detail and this approach has been successfully applied to a millimeter wave phased array radar. Specifically, reception antenna works with two different weights being used in turn, one with wide beam and anther, narrow beam. The ratio of the amplitude of the wide beam reception signal to that of the narrow beam reception signal is used to evaluate whether the target echo was the result of the main lobe irradiation, by which, side lobe blanking has been achieved without a dedicated blanking antenna, and thus contradiction between the complexity of the SLB system and high integration has been alleviated. 3-antenna-element and 8-antenna-element time-domain SLB have all been considered and put into practice in the development process. Working mechanism and advantages and disadvantages are compared. The results suggest that, benefiting from the wide beam, the SLB effect of 3-antenna-element time-domain SLB was satisfactory with only signal of the SLB sum beam being used, but due to poor echo energy and high power dividing loss, when the target was far away from the radar, the SLB signal would be submerged by noise and lead to malfunction of the time-domain SLB; while when 8-antenna-element timedomain SLB was adopted, good SLB effect was achieved with signals from both the SLB sum and difference beam.
    2021(9):63-68, DOI:
    Abstract:
    This paper discusses the collection and processing of traffic abnormal data, and designs a radar information collection system based on airborne lida. When processing the original data of airborne lidar, it identifies the abnormal data by identifying the original data, and applies threshold theory and traffic flow theory to solve the problem of missing data. In order to correct the wrong data, etkin interpolation algorithm is used to verify the effectiveness; After the data correction of airborne lidar, an example is analyzed. The detection data is from the second ring road of a city in Liaoning Province, and the investigation period is 16 hours. The time period of data research is determined as 7∶00∶00-22∶57∶00 on July 22, 2020. Results at 08∶27∶00, the correct data was 68. 89≤vt≤71. 77. Taking the fifth order interpolation result as the starting point, after detection, it is determined that the fourth-order interpolation result rate is within the error range, and the error data is corrected to 68. 979 8 at 08∶27∶00, which solves the problem of traffic abnormal data collection and correction.
    2021(9):69-72, DOI:
    Abstract:
    Improvement of the spectral purity, thus reduction of the phase noise of transmitting signal is a target of the modern airborne radar. Based on optoelectronic oscillator, a microwave-photonic local oscillator source provides much more pure signal than a traditional microwave local oscillator. There are quite few researches on the vibration response of the microwave-photonic local oscillator source, while the environmental suitability of the airborne radar is extremely strict, which will reduce the practicality of microwave-photonic local oscillator source. This paper gives theoretical analysis and numerical simulation of the phase noise of the microwave-photonic local oscillator source in the vibrating environment. An empirical formula is constructed to describe its vibration response and verified by comparing the theoretical and experimental results. This work provides improvement direction of the microwave-photonic local oscillator source and has laid a good foundation of its engineering application.
    2021(9):73-79, DOI:
    Abstract:
    In this paper, aiming at the problem of multipath suppression and clutter suppression in the elevator shaft, combined with the clutter characteristics of the radar system in the elevator shaft, the suspected tracking method is used to analyze the propagation characteristics of the electromagnetic wave signal in the shaft. The results show that there is a serious multipath fading in the elevator shaft, at each car stop, the multipath fading changes obviously. Multipath radar signals are transmitted and received formally from the transponder in the shaft, which changes with the change of electromagnetic wave frequency and its spatial position. The clutter of elevator shaft comes from the echo of shaft wall. According to the key problem of static background clutter in the process of elevator shaft, a scientific suppression method based on scattering similarity is proposed.
    2021(9):80-85, DOI:
    Abstract:
    Under the background of the requirement of integrated radar electronic warfare, a detection-jamming integrated signal design of pseudo-random composite modulation is proposed in this paper to solve the problems of single function, easy to be detected and low energy utilization of jamming signal. The detection-jamming integrated signal model of pseudo-random composite modulation was constructed, and the ambiguity function, the related characteristics of pseudo-random sequence and the interference characteristics of theoretical analysis. The simulation experiments show that the integrated signal style with a good ambiguity function and spectrum characteristics, the collaboration receives the signal present strong noise interference, while the local receiver through the matched filtering, successfully detection, has good detection performance.
    2021(9):86-92, DOI:
    Abstract:
    Aiming at the disadvantages of the slow convergence speed of the traditional genetic algorithm and the limited population diversity in the calculation of the array antenna, a hybrid algorithm for sparsely processing the linear array and the rectangular planararray is proposed. The main program uses genetic algorithm as the global searcher for global optimization, and the harmony search algorithm as the local searcher. By continuously generating new individuals to replace the worst individual in the population, the genetic characteristics of individuals are improved and avoided premature convergence of the algorithm to the local optimal solution. A genetic algorithm adaptive function is constructed, and a hybrid crossover strategy is adopted to improve the diversity of the population. The simulation results show that the proposed hybrid algorithm improves the convergence speed of the sparse array antenna algorithm and reduces the sidelobe level of the array antenna, which is feasible.
    2021(9):93-98, DOI:
    Abstract:
    With the rapid development of high-speed digital signal processing, cancellation while sampling can be realized by the adaptive sidelobe cancellation (ASLC) system of modern phased array radar. The traditional jamming method based on jamming time constant and cancellation time constant is no longer effective. Based on the basic principle and weight optimization algorithm of ASLC of phased array radar, the anti-jamming performance of ASLC system is simulated and analyzed. Based on the signal detection process and sample selection principle of phased array radar, the leading smart noise jamming is adopted to compensate the jamming response time, so that the jamming signal completely covers the real target signal in the time domain and destroys the jamming sample selection of ASLC system. Simulation results show the effectiveness of the method.
    2021(9):99-104, DOI:
    Abstract:
    Aiming at the problem that the traditional simulation methods based on time flow are not precise enough, a DRFM jamming digital flow simulation system based on SystemVue is designed. First, the structure of the DRFM jamming system is designed, and the module building of the radar and jamming parts is realized by using SystemVue software. Then, simulation experiments are carried out on three jamming styles of DRFM false target, radio frequency noise and interrupted-sampling jamming. The processing results under different jamming parameters are compared and analyzed, and the simulation error analysis of the false target amplitude ratio of interrupted-sampling jamming is performed. The simulation demonstrates the feasibility of the entire jamming system, which is of reference significance for equipment experiment and evaluation, and also proves the modularity and digital advantages of the SystemVue simulation system and its powerful radio frequency simulation capabilities.
    2021(9):99-104, DOI:
    Abstract:
    With the rapid development of high-speed digital signal processing, cancellation while sampling can be realized by the adaptive sidelobe cancellation (ASLC) system of modern phased array radar. The traditional jamming method based on jamming time constant and cancellation time constant is no longer effective. Based on the basic principle and weight optimization algorithm of ASLC of phased array radar, the anti-jamming performance of ASLC system is simulated and analyzed. Based on the signal detection process and sample selection principle of phased array radar, the leading smart noise jamming is adopted to compensate the jamming response time, so that the jamming signal completely covers the real target signal in the time domain and destroys the jamming sample selection of ASLC system. Simulation results show the effectiveness of the method.
    2021(9):99-104, DOI:
    Abstract:
    Aiming at the problem that the traditional simulation methods based on time flow are not precise enough, a DRFM jamming digital flow simulation system based on SystemVue is designed. First, the structure of the DRFM jamming system is designed, and the module building of the radar and jamming parts is realized by using SystemVue software. Then, simulation experiments are carried out on three jamming styles of DRFM false target, radio frequency noise and interrupted-sampling jamming. The processing results under different jamming parameters are compared and analyzed, and the simulation error analysis of the false target amplitude ratio of interrupted-sampling jamming is performed. The simulation demonstrates the feasibility of the entire jamming system, which is of reference significance for equipment experiment and evaluation, and also proves the modularity and digital advantages of the SystemVue simulation system and its powerful radio frequency simulation capabilities.
    2021(9):99-104, DOI:
    Abstract:
    With the rapid development of high-speed digital signal processing, cancellation while sampling can be realized by the adaptive sidelobe cancellation (ASLC) system of modern phased array radar. The traditional jamming method based on jamming time constant and cancellation time constant is no longer effective. Based on the basic principle and weight optimization algorithm of ASLC of phased array radar, the anti-jamming performance of ASLC system is simulated and analyzed. Based on the signal detection process and sample selection principle of phased array radar, the leading smart noise jamming is adopted to compensate the jamming response time, so that the jamming signal completely covers the real target signal in the time domain and destroys the jamming sample selection of ASLC system. Simulation results show the effectiveness of the method.
    2021(9):99-104, DOI:
    Abstract:
    Aiming at the problem that the traditional simulation methods based on time flow are not precise enough, a DRFM jamming digital flow simulation system based on SystemVue is designed. First, the structure of the DRFM jamming system is designed, and the module building of the radar and jamming parts is realized by using SystemVue software. Then, simulation experiments are carried out on three jamming styles of DRFM false target, radio frequency noise and interrupted-sampling jamming. The processing results under different jamming parameters are compared and analyzed, and the simulation error analysis of the false target amplitude ratio of interrupted-sampling jamming is performed. The simulation demonstrates the feasibility of the entire jamming system, which is of reference significance for equipment experiment and evaluation, and also proves the modularity and digital advantages of the SystemVue simulation system and its powerful radio frequency simulation capabilities.
    Select AllDeselectExport
    Display Method:
    Select AllDeselectExport
    Display Method:
    2011,33(3), DOI:
    Abstract:
    Collaborative R&D platform on which processes,tools,data and knowledge were integrated was built through analyzing radar R&D problems.Unified design environment,unified process system,unified data space that composed radar R&D system were described.Three-tier structure of radar R&D platform was present.Management platform on collaborative tier provides the ability of task transition across organization and discipline.Design platform on application tier integrates knowledge and tool.Data platform on data tie...
    2011,33(3), DOI:
    Abstract:
    In computational electromagnetic field,the moment method based on surface integral equations for analysis of electromagnetic scattering by 3-D homogenous dielectric and PEC objects is a hot topic all through.In this paper,the EFIE integral equation is built on the surface and PMCHW integral equations is constructed based on the surface of homogenous dielectric object.Combined with adaptively modified characteristic basis function method(AMCBFM) that is based on dividing the object geometry into distinct blo...
    2011,33(3), DOI:
    Abstract:
    The sorties determination principle is discussed for narrowband coherent radar targets with non-rigid-structure based on a long coherent integration time in this paper.Firstly a novel signal model is proposed and some new concepts are put forward,such as common rotation Doppler,radial Doppler,chirp Doppler.And then it is pointed out that the initial frequency of target time-frequency distribution is decided by the sum of common rotation Doppler and radial Doppler,the trend is decided by chirp Doppler.Accord...
    2011,33(3), DOI:
    Abstract:
    Aiming at the complicated electromagnetic environment in informationization,Based on frame,function and character of the air-based command and control system and aerial denfence weapon network battle system,the concentrated,the distributed and the composite netting frame of the air-ground multi-sensor system fitting the dissimilar flat are proposed.Data fusion system model of the air-ground cooperation network aerial defense campaign system is constructed in this paper,which can improve the capability for a...
    2011,33(3), DOI:
    Abstract:
    Convolution jamming has become an important jamming for its high utilizable efficiency of energy,admirable interference effect and flexible control.Based on the forming mechanisms,the interference performances and characteristics of different kinds of noise convolution jammings is analyzed.According to the difference of waveforms and phases between noise convolution jamming and ordinary pulse convolution jamming,the character factors are extracted,and then fuzzy pattern recognition has been used to recogniz...
    2008,30(7), DOI:
    Abstract:
    对小波包分解和高阶统计量理论进行了阐述,提出一种基于高阶统计量特征和小波包分析相结合的雷达伺服传动系统故障诊断方法.当传动系统故障发生时,振动信号一般是非平稳和非高斯分布的信号,通常包含较强的噪声.用小波包分析对故障信号进行有针对性分解,并提取出故障特征频率带,然后运用高阶谱对故障特征信号进行分析,能够有效地实现故障诊断.
    2011,33(3), DOI:
    Abstract:
    Radar system state evaluation involves many factors,and most of the factors have fuzzy uncertainty.On the basis of establishing evaluation index system,an evaluation method of radar system state based on analytic hierarchy process(AHP) and fuzzy is proposed in this paper.For the problem that multi-factor comparison matrix is difficult to meet consistency is achieved by transfer matrix theory,then the comprehensive weight of each index is obtained.Aiming at difference of various indexes,methods of measuring ...
    2011,33(3), DOI:
    Abstract:
    Because the operation frequency of high frequency surface wave radar(HFSWR) for target detection is selected by the monitoring of outside noise level,the optimal detection performance can not be achieved.To solve the problem,the multiple factors that affect the target detection performance are analyzed based on HF surface wave radar equation,and then a frequency selection method is presented by numerical simulation to calculate the relationship curve between SNR(SCR) and frequency.With the operation frequen...
    2011,33(3), DOI:
    Abstract:
    A new algorithm is proposed to solve the problem of quick target tracking initialization in clutter.The advantages of a new track initial model and one-step delay approach are integrated.An intermediate stage is added to the current common track initiation model.The one-step delay approach is used in processing the intermediate track.Two scan measurements is used for calculating the cumulative innovation and eliminating the false tracks.By this algorithm,the design flexibility is improved and that probabili...
    2008,30(7), DOI:
    Abstract:
    以Si双极型功率晶体管为代表的第一代半导体功率器件和以GaAs场效应晶体管为代表的第二代半导体功率器件为雷达发射机的大规模固态化和可靠性提高做出了贡献.近年来以SiC场效应功率晶体管和GaN高电子迁移率功率晶体管为代表的第三代半导体--宽禁带半导体功率器件具有击穿电压高、功率密度高、输出功率高、工作效率高、工作频率高、瞬时带宽宽、适合在高温环境下工作和抗辐射能力强等优点.人们寄希望于宽禁带半导体功率器件来解决第一代、第二代功率器件的输出功率低、效率低和工作频率有局限性以至于无法满足现代雷达、电子对抗和通信
    2011,33(3), DOI:
    Abstract:
    Dim signal detection is chanllenging due to the fact that the signal is submerged by the powerful sidelobe clutter,while the pulse Dopple(PD) radar is following the target.Stochastic resonance principle is made good use of to improve the signal noise ratio and the detection performance.Firstly,the basic principle of stochastic resonance is introduced,and the frequency spectrum characteristic of the return signals is analyzed while the radar is after the target.Then a novel approach based upon stochastic res...
    2011,33(3), DOI:
    Abstract:
    Ambiguity resolution is necessary in signal process as a consequence of the range ambiguity in ground-based radar of PD system.So,a novel method,PRI staggering and wobbling,for resolving range ambiguity is presented.Comparison to the routine 3/7 detection criterion,this algorithm can meet the capability of PD and improve the radar data rate consumedly.Then the application fields of this method is shown in the paper,which can provide some guiding significance for this algorithm.
    2009,31(8), DOI:
    Abstract:
    微波复合介质板是现代电子设备重要的基础材料之一.文中介绍了微波复合介质板系列国产化的研究开发情况,突破介质板材料开发和工程化制造技术,成功研制出3类聚四氟乙烯微波复合介质板.该复合介质板的性能指标达到了预期要求,通过应用对比试验表明了其已等效进口介质板的性能.
Search
Key Item
Keyword
Search
Archive