1996 IEEE Aerospace Applications Conference. Proceedings最新文献_第2页

Doppler analysis of low PRF radars 低PRF雷达的多普勒分析

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.499407

S. Hovanessian, N. Marechal, L. Ostroy

引用次数: 1

Surface reconstruction from serial cross sections 从连续截面重建表面

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.499674

M. Ahmed, E. Hemayed, E. Jansing, A. Farag

引用次数: 2

Continuous media and machine vision distributed, active stereo reconstruction 连续介质和机器视觉分布，主动立体重建

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.499673

W. Seales

引用次数: 0

Application of spacecraft system modeling techniques for the assessment of technology insertion 航天器系统建模技术在技术插入评估中的应用

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.496064

G. Law, K. Bell

引用次数: 0

Aperture sharing between low-background infrared sensors and ladar sensors 低背景红外传感器与雷达传感器孔径共享

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.499683

W. T. Roberts, P. Levan

引用次数: 0

Simulating the operation of a novel variable camber hydrofoil 模拟一种新型变弧度水翼的运行

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.496068

S. Fagg, X. Velay

引用次数: 3

A novel design technique for beam-waveguide antennas 一种新的波束波导天线设计技术

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.495876

W. Imbriale, M. Esquivel

{"title":"A novel design technique for beam-waveguide antennas","authors":"W. Imbriale, M. Esquivel","doi":"10.1109/AERO.1996.495876","DOIUrl":"https://doi.org/10.1109/AERO.1996.495876","url":null,"abstract":"The poor low-frequency performance of geometrically designed beam-waveguide antennas is shown to be caused by the diffraction phase centers being far from the geometrical optics mirror focus, resulting in substantial spillover and defocusing loss. To generate a new solution by a straightforward analytical design would prove cumbersome because of the large number of scattering surfaces required for the computation. Rather, a unique application was made of the conjugate phase-matching techniques to obtain the desired solution. A plane wave was used to illuminate the main reflector and the fields from the currents induced on the subreflector propagated through the BWG to a plane centered on the input focal point. By taking the complex-conjugate of the currents induced on this plane and applying the radiation integral, the far-field pattern was obtained for a theoretical horn that maximizes the antenna gain. To synthesize a horn quickly and inexpensively, the theoretical horn was matched as well as possible by an appropriately sized circular corrugated horn and the new feed system has been implemented in the JPL Research and Development BWG as part of a dual S/X-band feed system. The new S-band feed system is shown to perform significantly better than the original geometrically designed system.","PeriodicalId":262646,"journal":{"name":"1996 IEEE Aerospace Applications Conference. Proceedings","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114848535","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: 6

Principal component background suppression 主成分背景抑制

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.496057

J.A. Kirk, M. Donofrio

{"title":"Principal component background suppression","authors":"J.A. Kirk, M. Donofrio","doi":"10.1109/AERO.1996.496057","DOIUrl":"https://doi.org/10.1109/AERO.1996.496057","url":null,"abstract":"We have developed an adaptable background suppression algorithm, based on the statistical technique of principal components, to mitigate the effects of sensor line of sight motion (clutter) across structured background scenes. The central idea is construction of a \"background space\" as a linear vector subspace modeling the background being viewed. We have applied our algorithm to two test cases which were constructed by simulating random motion of a staring array focal plane over a high resolution scene. The first test case, with clutter noise only, found a low-intensity signal (S/N=0.05) with a 245-fold enhancement by projecting out a background space using 40 principal components. The second test case added Gaussian electronic noise and found the signal with a 34-fold increase in signal-to-noise using 16 principal components. This is believed to closely represent the actual problem encountered in staring array focal planes. Our results show that increasing the number of principal components increases the algorithm's ability to suppress clutter up to the point where electronic noise becomes dominant. We give a heuristic argument for determining the proper number of principal components for maximum signal-to-noise enhancement.","PeriodicalId":262646,"journal":{"name":"1996 IEEE Aerospace Applications Conference. Proceedings","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114851440","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: 4

The Space and Missile Tracking System contribution to Planetary Defense: detection of asteroids and comets with Earth-crossing orbits 空间和导弹跟踪系统对行星防御的贡献:探测轨道与地球相交的小行星和彗星

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.499661

R. Wright, C. Hoult

{"title":"The Space and Missile Tracking System contribution to Planetary Defense: detection of asteroids and comets with Earth-crossing orbits","authors":"R. Wright, C. Hoult","doi":"10.1109/AERO.1996.499661","DOIUrl":"https://doi.org/10.1109/AERO.1996.499661","url":null,"abstract":"Describes the capability of the Space and Missile Tracking System (SMTS), formerly called Brilliant Eyes (BE), to discover and track near Earth objects (NEOs)-asteroids and comets-as part of the defense of our planet. SMTS will consist of many identical small satellites in low Earth orbit. Each satellite will be equipped with multicolor passive sensors which include visible light, short-wave infrared (SWIR) and long-wave infrared (LWIR) wavebands (among others). After outlining the nature of the NEO impact hazard, the paper describes the SMTS program, and SMTS's role in support of the Air Force Space Command's Space Surveillance and Planetary Defense missions. Data on SMTS's NEO detection range as a function of NEO size is provided for a range of conditions for both the visible and LWIR bands. SMTS's capability to observe the celestial sphere as a by-product of Space Surveillance operations is estimated. This result is used to estimate the probability of observing a NEO during a single pass for a variety of encounters. Finally, SMTS's capability to supply state and intensity estimates for meteors during atmospheric entry using stereo SWIR observations is discussed.","PeriodicalId":262646,"journal":{"name":"1996 IEEE Aerospace Applications Conference. Proceedings","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124688221","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 regression analysis of a Space Shuttle software failure data set 航天飞机软件故障数据集的回归分析

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.499670

R. Karcich, G. Knafl, J. A. Morgan

{"title":"A regression analysis of a Space Shuttle software failure data set","authors":"R. Karcich, G. Knafl, J. A. Morgan","doi":"10.1109/AERO.1996.499670","DOIUrl":"https://doi.org/10.1109/AERO.1996.499670","url":null,"abstract":"Regression methods are employed in analyzing a Space Shuttle failure data set. A class of models based on transforms of cumulative time and cumulative failures is considered. It is used to predict both current as well as future log transformed failure intensity. This class includes several popular software reliability models including the exponential, logarithmic, and power models. It also includes models based on transforms of the time per failure, the time-varying analogue to the mean time between failures. Models are compared on the basis of their predictive performance as measured by the predicted residual sum of squares (PRESS) criterion. Time per failure is included as one of the independent variables in the models identified as having the lowest PRESS score, both when predicting current as well as future log failure intensity. Analyses are conducted using failures within a final subset of the observation interval. This subset is chosen through inspection of the plot of time per failure in terms of cumulative time. The impact of the choice of this subset is assessed by comparing results for analyses of that subset with analyses of the data in the complete observation interval.","PeriodicalId":262646,"journal":{"name":"1996 IEEE Aerospace Applications Conference. Proceedings","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127134417","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