1996 IEEE Aerospace Applications Conference. Proceedings最新文献

An advanced spacecraft avionics architecture 一种先进的航天器航空电子结构

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.495887

J. Borky, B.K. Singaraju, K. B. Stevens

引用次数: 8

Angular stepped frequency target detection technique 角阶跃频率目标检测技术

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.495939

B. Mahafza, D. Knight, N. Audeh

引用次数: 0

Bandwidth and modulation techniques under study by NASA NASA正在研究的带宽和调制技术

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.495989

J. C. Morakis, W. Miller

{"title":"Bandwidth and modulation techniques under study by NASA","authors":"J. C. Morakis, W. Miller","doi":"10.1109/AERO.1996.495989","DOIUrl":"https://doi.org/10.1109/AERO.1996.495989","url":null,"abstract":"As NASA programs demand higher data rates, the need for more bandwidth-efficient high-rate modulation schemes grows. This is of special interest to NASA if they are to reduce future users' required communication bandwidth and minimize spacecraft contact time to the ground stations. Currently, the Tracking and Data Relay Satellite System (TDRSS) KSA channel operates with Quadrature Phase Shift Keying and a rate 1/2 convolutional code. One of the strongest candidates for increasing-data throughput without increasing the required bandwidth is Octal Phase Shift Keying (8PSK). Eight phase Trellis Coded Modulation using a rate 2/3 convolutional code, for example, will double the throughput without any change in the bandwidth requirements when compared to the current system. Other coding schemes can be employed for higher throughput or coding gain depending on the program requirements. In order to ensure that NASA can support high data rate programs through TDRSS, the error-rate performance of 8PSK operated through the telecommunication link at 450 Mega-bits per second (Mbps) was measured by the New Mexico State University (NMSU). Octal phase-shift keying was chosen because it has proven to be the strongest candidate for upcoming systems, exhibiting a higher information rate than QPSK for the same transition bandwidth. Channel measurements were made at the White Sands Ground Terminal (WSGT) and are summarized.","PeriodicalId":262646,"journal":{"name":"1996 IEEE Aerospace Applications Conference. Proceedings","volume":"42 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":"125071221","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

Fault tolerant system design in the concept exploration stage of a mission critical computing system 关键任务计算系统概念探索阶段的容错系统设计

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.495893

T. Monaghan

{"title":"Fault tolerant system design in the concept exploration stage of a mission critical computing system","authors":"T. Monaghan","doi":"10.1109/AERO.1996.495893","DOIUrl":"https://doi.org/10.1109/AERO.1996.495893","url":null,"abstract":"As the DoD enters a new era of weapon systems procurement it faces the critical question of how to manage and procure dependable and cost effective, mission critical computing systems. Program offices must, within the extreme time pressures of modern weapon systems development, apply fault tolerant systems design principles early in the design cycle before major resources are committed to a particular systems architecture. This paper describes the dependability evaluations and trade studies that should be done in the concept exploration stage of a mission critical computing system. These studies are considered from the point of view of a government program office in charge of the RFP requirements and Statement Of Work (SOW) design review and milestone deliverables. This paper will describe a dependability paradigm that involves the interplay between the analysis of field failure data, analytic and functional modeling and fault injection experiments. The paper will then outline the dependability requirements and evaluation criteria for the System Requirements Review (SRR) and System Design Review (SDR) that flow from this paradigm.","PeriodicalId":262646,"journal":{"name":"1996 IEEE Aerospace Applications Conference. Proceedings","volume":"54 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":"126867188","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

Geosynchronous space based radar concept development for theater surveillance 用于战区监视的地球同步天基雷达概念发展

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.499404

S. Fiedler, B. Preiss

引用次数: 11

Beyond SIR-C/X-SAR 除了SIR-C / X-SAR

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.495964

D. Evans, A. Freeman

{"title":"Beyond SIR-C/X-SAR","authors":"D. Evans, A. Freeman","doi":"10.1109/AERO.1996.495964","DOIUrl":"https://doi.org/10.1109/AERO.1996.495964","url":null,"abstract":"SAR data provide unique information about the health of the planet and its biodiversity, as well as critical data for natural hazards and resource assessments. Based on the success of the Spaceborne Imaging Radar and X-band Synthetic Aperture Radar (SIR-C/X-SAR) missions, an evolving U.S. Flight program leading to long-term environmental monitoring and commercial applications is being developed to meet the needs of the science community and operational and commercial users. Requirements have been collected from a variety of sources, both nationally and internationally. The Committee on Earth Studies of the National Research Council Space Studies Board has provided recommendations on science priorities. An Interagency ad hoc working group on SAR has established requirements for the U.S. Operational user community, and an International SAR Working Group has the task of recommending an integrated approach to global SAR observations. Implementation approaches have been developed that focus on cost-effective means to meet these needs. Fundamental to the resulting program are the acquisition of a globally consistent digital topographic data base, continuity of calibrated multiparameter SAR data, support for airborne SAR campaigns, and infusion of new technology. In addition, international outreach programs have been initiated to increase the user base for SAR data. Mission concepts included in this scenario are a Shuttle Radar Topography Mapper (SRTM), a LightSAR Technology validation mission, and an International SAR (ISAR) constellation.","PeriodicalId":262646,"journal":{"name":"1996 IEEE Aerospace Applications Conference. Proceedings","volume":"32 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":"123918781","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

RAMOS near term observations RAMOS近期观测

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.496055

C. Beeler, C. H. Humphrey, A. Lepage, M.E. Pitkanen, O. Shepherd, B. Tilton

{"title":"RAMOS near term observations","authors":"C. Beeler, C. H. Humphrey, A. Lepage, M.E. Pitkanen, O. Shepherd, B. Tilton","doi":"10.1109/AERO.1996.496055","DOIUrl":"https://doi.org/10.1109/AERO.1996.496055","url":null,"abstract":"The Russian American Observational Satellites (RAMOS) program is a joint US-Russian experiment designed to collect simultaneous stereo imagery in the visible and IR wavelength regions in support of clutter measurements and environmental monitoring. The classic RAMOS experiment utilizes complementary sensors on board two dedicated, extended-lifetime satellites, an American Observational Satellite (AOS) and a Russian Observational Satellite (ROS), which are in the same low Earth orbit. In preparation for the launch of these dedicated satellites, the RAMOS program is currently making use of existing US and Russian assets in a series of near term observations. These observations are designed to accomplish the milestones that lead RAMOS to its goals of developing a data base of three-dimensional background radiance and spatial structure statistics, and of obtaining the ability to monitor environmental trends and specific atmospheric events, such as hurricanes. The intermediate goals of the RAMOS program and how they will be accomplished through these near-term observations are discussed. The first set of assets used for these observations is the NASA-owned WB-57 aircraft for the U.S. and either one of two Russian satellites, Resource 1 or MIR. Two simultaneous data collection events have occurred thus far. The U.S. sensors include an infrared multi-spectral imager, IR imagers, and visible cameras. The Russian satellites feature visible line scanners, visible and IR imagers, and video cameras. This paper includes discussions of both recent and future RAMOS near-term data collections and analysis, and presents data collected during the recent simultaneous measurements.","PeriodicalId":262646,"journal":{"name":"1996 IEEE Aerospace Applications Conference. Proceedings","volume":"50 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":"114320684","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

A database for an integrated software maintenance toolkit 用于集成软件维护工具包的数据库

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.495979

A. von Mayrhauser, K. Archie

引用次数: 0

A scheduling tool for parallel and distributed systems 并行和分布式系统的调度工具

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.496067

B. Shirazi, J. Marquis

引用次数: 1

A software blackbox recorder 一个软件黑匣子记录器

1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.499669

J. Munson

引用次数: 12