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Proceedings of the 1988 IEEE National Radar Conference最新文献

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An RCS analysis of generic airborne vehicles dependence on frequency and bistatic angle 基于频率和双基地角的通用飞行器RCS分析
Proceedings of the 1988 IEEE National Radar Conference Pub Date : 1988-04-20 DOI: 10.1109/NRC.1988.10960
C. Cha, J. Michels, E. Starczewski
{"title":"An RCS analysis of generic airborne vehicles dependence on frequency and bistatic angle","authors":"C. Cha, J. Michels, E. Starczewski","doi":"10.1109/NRC.1988.10960","DOIUrl":"https://doi.org/10.1109/NRC.1988.10960","url":null,"abstract":"A radar cross section (RCS) prediction program (SRCRCS), developed to assist in corroboration of RCS measurements and theoretical treatments used to verify airborne vehicle signatures, is reviewed. Emphasis is placed on the use of the first-order, high-frequency asymptotic techniques of physical optics and an equivalent current formulation of the physical theory of diffraction (PTD). The code has been utilized to provide both narrowband and wideband signatures of airborne vehicles in the frequency range from upper UHF to C-bands. The prediction capability includes bistatic geometries from monostatic to forward scattering. Recently, the code has been extended to include a moment-method solution to the electric field integral equation (EFIE). This capability enabled the consideration of electrically small bodies, extending the analytical capability to lower frequencies for the targets of interest. Results that demonstrate a few of the capabilities of the software program are discussed.<<ETX>>","PeriodicalId":237192,"journal":{"name":"Proceedings of the 1988 IEEE National Radar Conference","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129753459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On radar polarization mixed target state decomposition techniques 雷达极化混合目标状态分解技术研究
Proceedings of the 1988 IEEE National Radar Conference Pub Date : 1988-04-20 DOI: 10.1109/NRC.1988.10967
W. Holm, R. Barnes
{"title":"On radar polarization mixed target state decomposition techniques","authors":"W. Holm, R. Barnes","doi":"10.1109/NRC.1988.10967","DOIUrl":"https://doi.org/10.1109/NRC.1988.10967","url":null,"abstract":"The mathematical representations of mixed target states using Mueller, covariance, and density matrices are discussed, and the relationship between these matrices is shown. A decomposition technique due to J.R. Huynen (1970) is considered, and a simple algorithm for calculating it is demonstrated. It was shown that, in addition to the Huynen decomposition, exactly two other decompositions exist whose mixed-target-state components possess the same roll-invariant property as the distributed N-target mixed-target-state component in the Huynen decomposition. The mixed-target-state components of all three of these Huynen-type decompositions were shown to correspond to targets with circular polarization nulls. The characteristic decomposition was then discussed and applied to a simple example which demonstrated that its pure-state component provides the average target representation. It is noted that this decomposition may have applications to stationary target identification.<<ETX>>","PeriodicalId":237192,"journal":{"name":"Proceedings of the 1988 IEEE National Radar Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127638087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 113
Distortion free SAR imagery and change detection 无失真SAR图像和变化检测
Proceedings of the 1988 IEEE National Radar Conference Pub Date : 1988-04-20 DOI: 10.1109/NRC.1988.10937
J. Wood, R. White, C. Oliver
{"title":"Distortion free SAR imagery and change detection","authors":"J. Wood, R. White, C. Oliver","doi":"10.1109/NRC.1988.10937","DOIUrl":"https://doi.org/10.1109/NRC.1988.10937","url":null,"abstract":"Sources of defocusing and azimuth distortion in synthetic-aperture radar (SAR) imagery are outlined. It is shown how autofocus measurements can be used to measure the aircraft track, and provide phase corrections to the raw SAR data. When the phase-corrected data is processed, correctly focussed imagery, free of any azimuth distortions, is produced. For low look-angle systems, range distortion due to terrain height variation is generally negligible, and therefore the system described produces distortion-free SAR imagery. The change detection problem is also considered: given two SAR images of the same area, locate changes that have occurred in the time between the images being obtained. Two approaches to this problem are described. The first applies a simple featuring operation to the two images, followed by hard limiting and image differencing. This is found to detect changed targets well. In the second method, the two images are segmented, and the segmentation descriptions are compared for inconsistencies indicating changes. This approach allows one to identify changes in targets having distinctive characteristics, such as shape or size.<<ETX>>","PeriodicalId":237192,"journal":{"name":"Proceedings of the 1988 IEEE National Radar Conference","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114567844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Synthesis of arbitrary and conformal arrays using non-linear optimization techniques 利用非线性优化技术合成任意和共形阵列
Proceedings of the 1988 IEEE National Radar Conference Pub Date : 1988-04-20 DOI: 10.1109/NRC.1988.10927
M. Banach, J. Cunningham
{"title":"Synthesis of arbitrary and conformal arrays using non-linear optimization techniques","authors":"M. Banach, J. Cunningham","doi":"10.1109/NRC.1988.10927","DOIUrl":"https://doi.org/10.1109/NRC.1988.10927","url":null,"abstract":"Two related synthesis problems associated with coherent sensor array processing are discussed. The first problem concerns the determination of the geometric arrangement of a fixed number of array elements to achieve an optimal response; the other is to find a set of shading weights for an array of predetermined geometry. The case of an array of sensors with arbitrary 3-D geometry or conformity to a curved sheet in space, which in general do not have analytic solutions, is treated. These synthesis problems are solved by the application of nonlinear optimization techniques. Methods are presented that are suitable for configuring arrays of arbitrary geometry, applicable for most coherent signal-processing algorithms, along with a method for determining weights useful for conventional beamforming. As with most nonlinear optimization problems, the solutions represent only local optimality and not global optimality. The usual technique of reoptimization with random or perturbed initial values should be used to insure that suitable local minima are found.<<ETX>>","PeriodicalId":237192,"journal":{"name":"Proceedings of the 1988 IEEE National Radar Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124055075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
A computation compression technique for SAR based on vector quantization 基于矢量量化的SAR计算压缩技术
Proceedings of the 1988 IEEE National Radar Conference Pub Date : 1988-04-20 DOI: 10.1109/NRC.1988.10944
C. Read, D. Arnold, D. M. Chabries, R. Christiansen
{"title":"A computation compression technique for SAR based on vector quantization","authors":"C. Read, D. Arnold, D. M. Chabries, R. Christiansen","doi":"10.1109/NRC.1988.10944","DOIUrl":"https://doi.org/10.1109/NRC.1988.10944","url":null,"abstract":"A technique for data compression of synthetic-aperture radar (SAR) imagery using vector quantization (VQ) is described that provides a reduction in processing requirements for SAR focusing over traditional fast Fourier transform (FFT) implementations. The computation compression technique (CCT) used is a method of trading computations for memory. By using larger memories, the amount of computation time required to implement a function can be reduced. Results show approximately a three-fold speedup over FFT implementations using an HP 350 processor. It is noted that the CCT is much more easily parallelized than the FFT approach, which can further reduce computation times.<<ETX>>","PeriodicalId":237192,"journal":{"name":"Proceedings of the 1988 IEEE National Radar Conference","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125959204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Calibration considerations in a large bistatic angle airborne radar system for ground clutter measurements 大双基地角机载雷达系统对地杂波测量的标定考虑
Proceedings of the 1988 IEEE National Radar Conference Pub Date : 1988-04-20 DOI: 10.1109/NRC.1988.10963
S. Anthony, F. Stremler, M. Wicks
{"title":"Calibration considerations in a large bistatic angle airborne radar system for ground clutter measurements","authors":"S. Anthony, F. Stremler, M. Wicks","doi":"10.1109/NRC.1988.10963","DOIUrl":"https://doi.org/10.1109/NRC.1988.10963","url":null,"abstract":"Calibration considerations and the performance analysis of an L-band airborne clutter measurement system are discussed. The measurement system is designed to collect simultaneous bistatic and monostatic clutter measurements in support of the hybrid bistatic radar (HBR) system. The analysis techniques used to define the experiment geometry and resulting resolution cells, calibration considerations, and the impact on the ability to determine clutter radar cross sections are described. The calibration techniques selected involved the transfer of calibration data from optimal geometries for calibration, to the geometries of interest in this program.<<ETX>>","PeriodicalId":237192,"journal":{"name":"Proceedings of the 1988 IEEE National Radar Conference","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131075079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Applications of knowledge based systems to surveillance 基于知识的系统在监控中的应用
Proceedings of the 1988 IEEE National Radar Conference Pub Date : 1988-04-20 DOI: 10.1109/NRC.1988.10950
V. Vannicola, J. Mineo
{"title":"Applications of knowledge based systems to surveillance","authors":"V. Vannicola, J. Mineo","doi":"10.1109/NRC.1988.10950","DOIUrl":"https://doi.org/10.1109/NRC.1988.10950","url":null,"abstract":"The use of artificial intelligence (AI) tools to enhance radar signal processing is discussed. Knowledge-based trackers, a knowledge-based target identification system, and an expert system for operating and controlling the modes and parameters of an advanced multifunction surveillance system are presented. In the case of the track detector, a low threshold criterion is set for the incoming signal, which consequently allows a high probability of false alarm. Through use of a knowledge base and constraints on the target dynamics, realistic trajectories are sorted out to establish a declaration/detection for a track. For identification, a variety of signal features depicting different targets are matched with features derived from the received signal. A target is identified when the received signal is found to contain that set of features which is unique to a feature set in the knowledge base. A radar operator expert system assesses radar scenario situations and responds by controlling the parameters, modes and resources to optimize the overall performance and mission.<<ETX>>","PeriodicalId":237192,"journal":{"name":"Proceedings of the 1988 IEEE National Radar Conference","volume":"262 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121327689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 29
A coherent model of radar weather clutter 雷达天气杂波的相干模型
Proceedings of the 1988 IEEE National Radar Conference Pub Date : 1988-04-20 DOI: 10.1109/NRC.1988.10966
R. Miller
{"title":"A coherent model of radar weather clutter","authors":"R. Miller","doi":"10.1109/NRC.1988.10966","DOIUrl":"https://doi.org/10.1109/NRC.1988.10966","url":null,"abstract":"A coherent model of radar weather clutter is considered that is based on the analysis of digitally recorded radar data. Analysis of such data shows that weather clutter can be clearly non-Rayleigh in its amplitude statistics. However, the clutter spectrum does not vary appreciably with spatial position. In the coherent model for weather clutter subsequently described, the clutter return is expressed in terms of amplitude-modulated Gaussian time-series. An application of this model to the analysis of the performance of coherent signal processors is discussed.<<ETX>>","PeriodicalId":237192,"journal":{"name":"Proceedings of the 1988 IEEE National Radar Conference","volume":"59 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120922631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
An overview of MMW radar reflectivity 毫米波雷达反射率概述
Proceedings of the 1988 IEEE National Radar Conference Pub Date : 1988-04-20 DOI: 10.1109/NRC.1988.10964
T. L. Lane, C. Scheer, N. Currie
{"title":"An overview of MMW radar reflectivity","authors":"T. L. Lane, C. Scheer, N. Currie","doi":"10.1109/NRC.1988.10964","DOIUrl":"https://doi.org/10.1109/NRC.1988.10964","url":null,"abstract":"An overview is given of millimeter-wave (MMW) reflectivity data that is being used to form a reflectivity database for radar systems' developers. A summary of land reflectivity at 35 GHz and 95 GHz is presented. The material discussed is limited to land clutter reflectivity at 35 GHz and 95 GHz in terms of its spatial distributions, i.e. averages (means) and standard deviations. These are compared as a function of type or class of land clutter. The dependence on incident angle, frequency, frequency bandwidth, polarization, and resolution is described. The data consistency problems are noted. This summary is based on readily available reports and articles generated over the last 10 years. The general dependencies seen in the data, the type of information available, and caution which the user must exercise when applying the data are discussed.<<ETX>>","PeriodicalId":237192,"journal":{"name":"Proceedings of the 1988 IEEE National Radar Conference","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124753843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
MMW radar cross section range characterizes targets 毫米波雷达的截面距离表征目标
Proceedings of the 1988 IEEE National Radar Conference Pub Date : 1988-04-20 DOI: 10.1109/NRC.1988.10959
J. Scheer, W. E. Chastain, N. T. Alexander, J. Bruder, C. Scheer, M. Horst, J. Trostel
{"title":"MMW radar cross section range characterizes targets","authors":"J. Scheer, W. E. Chastain, N. T. Alexander, J. Bruder, C. Scheer, M. Horst, J. Trostel","doi":"10.1109/NRC.1988.10959","DOIUrl":"https://doi.org/10.1109/NRC.1988.10959","url":null,"abstract":"Examples of high-resolution millimeter-wave radar images of radar targets and the facilities, equipment, and techniques required to obtain these images are presented. Unique inverse synthetic-aperture radar (ISAR), fully polarimetric data collected on the Georgia Tech Research Institute (GTRI) Electromagnetic Test Facility (EMTF) are discussed. An overview is given of the EMTF, which includes a lookdown target radar cross section (RCS) measurement range that comprises: a very stable 100-foot tower with associated elevatable radar platform; a 100-ton-capacity target turntable located 150 ft from the base of the tower; several measurement radars covering the microwave and millimeter-wave (MMW) spectrum; and a target data processing facility.<<ETX>>","PeriodicalId":237192,"journal":{"name":"Proceedings of the 1988 IEEE National Radar Conference","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116215590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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