IEEE Transactions on Military Electronics最新文献

On Detection and Estimation of Wave Fields for Surveillance 监测用波场的检测与估计

IEEE Transactions on Military Electronics Pub Date : 1966-05-01 DOI: 10.1109/TME.1965.4323175

H. Urkowitz

{"title":"On Detection and Estimation of Wave Fields for Surveillance","authors":"H. Urkowitz","doi":"10.1109/TME.1965.4323175","DOIUrl":"https://doi.org/10.1109/TME.1965.4323175","url":null,"abstract":"This paper considers the detection and estimation of a signal field in the presence of a noise field. The wave field, which is a continuous space-time function, is converted into a discrete set of time functions by an array of transducer elements which convert the physical field quantities into other quantities appropriate for processing. The resulting set of time functions makes up a vector random process. A generalization of the one-dimensional Karhunen-Loeve expansion applied to the vector random process yields a series representation with uncorrelated coefficients. The effects of complex element weighting and of internal noise are considered in describing the noise and signal vector processes. If the noise field is Gaussian, the conditional probability density functions of the vector processes, under the hypotheses of noise alone and of signal pulse noise, are straightforwardly written, leading directly to the likelihood ratio for a completely known signal. The operation to obtain a test statistic based upon the likelihood ratio is interpreted as a set of filtering operations, time-varying in the general case where the noise field is not wide-sense stationary. When the noise field is wide-sense stationary, the field may be described by a spectral density matrix whose elements are the cross-spectral densities of the total noise at the transducers taken in pairs. The operation to obtain the test statistic is now interpreted as a set of filtering operations described by a filtering matrix.","PeriodicalId":199455,"journal":{"name":"IEEE Transactions on Military Electronics","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1966-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121791947","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: 3

Part II: Degradation of Detectability Due to Clipping 第二部分:由于裁剪导致的可探测性退化

IEEE Transactions on Military Electronics Pub Date : 1965-07-01 DOI: 10.1109/TME.1965.4323212

P. Schultheiss, F. Tuteur

引用次数: 7

Delay Line Secondaries in Phase-Modulated Sweep Integrators 相位调制扫描积分器中的二次延迟线

IEEE Transactions on Military Electronics Pub Date : 1965-07-01 DOI: 10.1109/TME.1965.4323210

H. Urkowitz

{"title":"Delay Line Secondaries in Phase-Modulated Sweep Integrators","authors":"H. Urkowitz","doi":"10.1109/TME.1965.4323210","DOIUrl":"https://doi.org/10.1109/TME.1965.4323210","url":null,"abstract":"A video sweep integrator is a device for adding successive radar returns of transmitted pulses. One type of sweep integrator uses an ultrasonic delay line for storage, requiring that the delay line transmission be in the form of a modulated carrier. Addition is obtained by means of a closed regenerative loop that operates for a finite time to provide uniformly weighted addition or operates continuously with exponentially decaying memory. The former type of operation is called iteration to distinguish it from the continuous operation called integration. This paper treats the case of phase modulation imposed upon the carrier. Delay line secondary, or spurious, responses result from multipath propagation through the delay line. The cumulative effect of these secondaries after circulation in the sweep integrator or iterator may set a severe limitation on dynamic range. This paper treats two cases of secondary buildup: 1) the coherent buildup case in which relative buildup of secondaries is much greater than that of the signal, and 2) noncoherent buildup in which the built-up secondary effect is less than in the coherent case. It is suggested that it is possible to assure noncoherent secondary buildup by changing the carrier frequency in an irregular manner upon each circulation around the regenerative loop.","PeriodicalId":199455,"journal":{"name":"IEEE Transactions on Military Electronics","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1965-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134110665","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

Optimum and Suboptimum Detection of Directional Gaussian Signals in an Isotropic Gaussian Noise Field Part I: Likelihood Ratio and Power Detectors 各向同性高斯噪声场中定向高斯信号的最优和次优检测第一部分:似然比和功率检测器

IEEE Transactions on Military Electronics Pub Date : 1965-07-01 DOI: 10.1109/TME.1965.4323211

P. Schultheiss, F. Tuteur

引用次数: 10

Statistical Description of Nonlinear Signal Processing in Array Antenna Systems 阵列天线系统非线性信号处理的统计描述

IEEE Transactions on Military Electronics Pub Date : 1965-07-01 DOI: 10.1109/TME.1965.4323215

J. J. Kovaly

引用次数: 2

Optimum Signal Design and Processing for Reverberation-Limited Environments 限制混响环境的最佳信号设计和处理

IEEE Transactions on Military Electronics Pub Date : 1965-07-01 DOI: 10.1109/TME.1965.4323213

H. V. Trees

引用次数: 32

Automatic Correction of Timing Errors in Magnetic Tape Recorders 磁带录音机定时误差的自动校正

IEEE Transactions on Military Electronics Pub Date : 1965-07-01 DOI: 10.1109/TME.1965.4323216

W. Hannan, J. Schanne, D. J. Woywood

引用次数: 13

Radar System Performance Charts 雷达系统性能图

IEEE Transactions on Military Electronics Pub Date : 1965-07-01 DOI: 10.1109/TME.1965.4323217

D. K. Barton

{"title":"Radar System Performance Charts","authors":"D. K. Barton","doi":"10.1109/TME.1965.4323217","DOIUrl":"https://doi.org/10.1109/TME.1965.4323217","url":null,"abstract":"The fundamental limits to radar performance in search and tracking can be expressed on three charts, in terms of products involving transmitted power, antenna gain, and effective aperture area. Locations of past and present radar systems on these charts disclose evolutionary trends in system design and indicate regions of practical and economic balance between transmitter and antenna complexity, in terms of ratios of power to gain and aperture. The basis of choice for operating frequency is clarified for different applications of radar, such as air surveillance, precision tracking, weapon control, and combinations of these tasks. It is suggested that these historical trends, derived from a large sample of successful radar systems, will furnish a better guide to economic optimization than will empirical cost equations. They are also helpful in comparing diverse approaches to radar system design, and in estimating the dependence of proposed systems upon new component and technique developments. The examples used in this paper are drawn primarily from ground-based radar systems, and serve to clarify the relationships between conventional and phased-array radar systems used for aircraft and missile detection, tracking, and weapon control.","PeriodicalId":199455,"journal":{"name":"IEEE Transactions on Military Electronics","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1965-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130709199","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

A Two-Step Sequential Procedure for Improving the Cumulative Probability of Detection in Radars 一种提高雷达累积探测概率的两步序贯方法

IEEE Transactions on Military Electronics Pub Date : 1965-07-01 DOI: 10.1109/TME.1965.4323219

L. Brennan, F. Hill

{"title":"A Two-Step Sequential Procedure for Improving the Cumulative Probability of Detection in Radars","authors":"L. Brennan, F. Hill","doi":"10.1109/TME.1965.4323219","DOIUrl":"https://doi.org/10.1109/TME.1965.4323219","url":null,"abstract":"Sequential detection procedures, which may be used with phased-array radars, can provide a significant improvement in search capability as compared to uniform scanning. This paper discusses the improvement in cumulative detection probability (the probability that an approaching target is detected before it reaches a given range) which can be obtained with the two-step sequential test, first described by Finn [6]. In this test, a first pulse is transmitted in each beam position. If a threshold crossing is observed in any range cell, a second pulse of higher energy is transmitted and the returns compared with a higher threshold. A target is declared present if and only if threshold crossings are observed on both pulses in the same range cell. Curves of cumnulative detection probability vs. range are given for a nonfluctuating target and for two of the target fluctuation models considered by Swerling [7]. Results are given for three values of range resolution, and the radar parameters that optimize performance are tabulated in each case. In practical cases where the range resolution is from one to ten percent of the range, the sequential test considered here yields an energy saving of 3 to 4 dB as compared with uniform scanning.","PeriodicalId":199455,"journal":{"name":"IEEE Transactions on Military Electronics","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1965-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124658608","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: 20

Activated Delay-Line Receiving Arrays 激活延迟线接收阵列

IEEE Transactions on Military Electronics Pub Date : 1965-07-01 DOI: 10.1109/TME.1965.4323220

H. Schimmel

引用次数: 0