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1996 IEEE Aerospace Applications Conference. Proceedings最新文献

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Development of a ground-based, polarimetric synthetic aperture radar 陆基偏振合成孔径雷达的研制
1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.499408
J. Bennett, K. Morrison
{"title":"Development of a ground-based, polarimetric synthetic aperture radar","authors":"J. Bennett, K. Morrison","doi":"10.1109/AERO.1996.499408","DOIUrl":"https://doi.org/10.1109/AERO.1996.499408","url":null,"abstract":"A description of an indoor SAR measurement facility is given and a series of results is presented to demonstrate the imaging properties of the system. The aim of the work is to understand better the microwave backscatter characteristics of vegetation and soils. Based around a vector network analyser, the system uses synthetic pulse techniques to obtain high resolution images. The principles of the technique are presented, together with a description of the imaging algorithm used. Calibration procedures are implemented successfully and the images provide useful quantitative RCS information. The polarimetric capability of the system is demonstrated for both metallic and vegetation targets. The system is a precursor to an outdoor polarimetric ground-based synthetic aperture radar (GB-SAR), designed to be easily and rapidly deployable at widely separated measurement sites.","PeriodicalId":262646,"journal":{"name":"1996 IEEE Aerospace Applications Conference. Proceedings","volume":"11 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":"122182211","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
On the role of program understanding in re-engineering tasks 论程序理解在再造任务中的作用
1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.495930
A. V. Mayrhauser, M. Vans
{"title":"On the role of program understanding in re-engineering tasks","authors":"A. V. Mayrhauser, M. Vans","doi":"10.1109/AERO.1996.495930","DOIUrl":"https://doi.org/10.1109/AERO.1996.495930","url":null,"abstract":"This paper reports on a software understanding experiment during re-engineering of large-scale software. Participants were professional software maintenance engineers. The paper explains the general understanding process, the information needs of these software engineers during their tasks, and the tool capabilities that would help them to be more productive.","PeriodicalId":262646,"journal":{"name":"1996 IEEE Aerospace Applications Conference. Proceedings","volume":"35 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":"122936862","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: 12
Speaker dependent speech compression for low bandwidth communication 基于说话人的低带宽通信语音压缩
1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.495940
H.D. Pfister, H.L. Pfister
{"title":"Speaker dependent speech compression for low bandwidth communication","authors":"H.D. Pfister, H.L. Pfister","doi":"10.1109/AERO.1996.495940","DOIUrl":"https://doi.org/10.1109/AERO.1996.495940","url":null,"abstract":"Standard Object Systems has developed novel signal processing method for the compression and decompression of speech signals. The approach provides a dramatic reduction in communication bandwidth requirements for speech data by using a two phase process. In the first phase, a speaker dependent voice information file is created to model the speaker. This file is used in the second phase to both compress the speaker's speech at the transmitter and decompress the speaker's speech at the receiver. This speech compression has demonstrated communications quality speech at bit rates as low as 500 bits per second. Current aerospace applications employ standards such as multi band excitation as used on INMARSAT-M (MBE) at 4,150 BPS, as code excited linear prediction (CELP) for the U.S. DoD 4800 BPS STU III system, or the North American digital cellular standard using vector sum excited LPC (VSELP) at 8000 BPS.","PeriodicalId":262646,"journal":{"name":"1996 IEEE Aerospace Applications Conference. Proceedings","volume":"25 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":"126765459","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
DTEMS interferometric SAR design and method of baseline tilt determination DTEMS干涉SAR设计及基线倾斜确定方法
1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.499406
H. Malliot
{"title":"DTEMS interferometric SAR design and method of baseline tilt determination","authors":"H. Malliot","doi":"10.1109/AERO.1996.499406","DOIUrl":"https://doi.org/10.1109/AERO.1996.499406","url":null,"abstract":"The Digital Terrain Elevation Mapping System (DTEMS) is a Lockheed Martin Missiles and Space (LMMS) commercial system for collection processing and archive of digital terrain matrix (DTM) and geometrically corrected ortho-rectified digital polarimetric radar imagery. DTEMS uses an ER-2 aircraft with an interferometric synthetic aperture radar (IFSAR) and differential GPS to develop a DTM in WGS84 rectangular coordinates with three meter post intervals. This paper describes the DTEMS X-band IFSAR design and presents the results of a system simulation which predicts that, for 45 degree or less terrain slope, DTEMS will achieve an average one /spl sigma/ relative elevation precision of 0.3 meter and absolute one /spl sigma/ elevation precision of 0.6 meter. The ER-2/IFSAR combination can provide up to 190,000 km/sup 2/ of single flight area coverage. With this coverage DTEMS will be able to map the state of California in two flights and the entire United States, including Alaska, in 49 flights. SAR interferometer geometric baseline (IGB) tilt error is the major contributor to terrain elevation error. GPS interferometry (GPSI) and recursive IGB tilt estimation is used to reduce the IGB tilt knowledge error to less than 0.001 degree. The DTEMS implementation of GPSI uses GPS antennas installed on the top of each wing pod at positions just above the radar receiver antennas. In these positions the antennas have rigid coupling to the radar antennas and the 8.5 meter GPS IGB is close and parallel to the 8.5 m SAR IGB between the radar antenna phase centers. Consequently measurement of the GPS IGB attitude constitutes indirect measurement of the SAR IGB attitude.","PeriodicalId":262646,"journal":{"name":"1996 IEEE Aerospace Applications Conference. Proceedings","volume":"31 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":"115511704","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: 10
Genetic algorithm optimization for aerospace electromagnetic design and analysis 遗传算法优化航空航天电磁设计与分析
1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.495874
J.M. Johnson, Y. Rahmat-Samii
{"title":"Genetic algorithm optimization for aerospace electromagnetic design and analysis","authors":"J.M. Johnson, Y. Rahmat-Samii","doi":"10.1109/AERO.1996.495874","DOIUrl":"https://doi.org/10.1109/AERO.1996.495874","url":null,"abstract":"This paper provides a tutorial overview of a new approach to optimization for aerospace electromagnetics known as the Genetic Algorithm. Genetic Algorithm (GA) optimizers are robust, stochastic search methods modeled on the concepts of natural selection and evolution. The relationship between traditional optimization techniques and GA is discussed and the details of GA optimization implementation are explored. The tutorial overview is followed by a number of applications in which GA has proved useful. The applications discussed include the design of lightweight, broad-band microwave absorbers, the reduction of array sidelobes in thinned arrays, the design of shaped beam antenna arrays, and the extraction of natural resonance modes of radar targets from the backscattered response data. Genetic Algorithm Optimization is shown to be suitable for optimizing a broad class of problems of interest to aerospace antennas and related electromagnetics.","PeriodicalId":262646,"journal":{"name":"1996 IEEE Aerospace Applications Conference. Proceedings","volume":"6 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":"121217984","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: 39
Application of error correction technologies to near-field antenna measurement systems 误差校正技术在近场天线测量系统中的应用
1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.495879
D. Fooshe
{"title":"Application of error correction technologies to near-field antenna measurement systems","authors":"D. Fooshe","doi":"10.1109/AERO.1996.495879","DOIUrl":"https://doi.org/10.1109/AERO.1996.495879","url":null,"abstract":"Near-field antenna measurement systems have been adopted by nearly all major aerospace companies as the preferred method of measuring antenna performance. This paper presents an overview of the latest application of patented optical and thermal error correction technologies to improve the measurement accuracy of large near-field scanners. A patented optical measurement system will be discussed which measures X and Y position, and X, Y and Z position errors. A patented motion tracking interferometer (MTI) technique has also been developed to compensate for thermally induced structural deformation.","PeriodicalId":262646,"journal":{"name":"1996 IEEE Aerospace Applications Conference. Proceedings","volume":"515 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":"116216558","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
Space radiation effects in high performance fiber optic data links for satellite data management 卫星数据管理用高性能光纤数据链路中的空间辐射效应
1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.499677
P. Marshall, C. Dale, K. Label, M. Flanegan
{"title":"Space radiation effects in high performance fiber optic data links for satellite data management","authors":"P. Marshall, C. Dale, K. Label, M. Flanegan","doi":"10.1109/AERO.1996.499677","DOIUrl":"https://doi.org/10.1109/AERO.1996.499677","url":null,"abstract":"Fiber optic based technologies are relatively new to satellite applications, and are receiving considerable attention for planned applications in NASA, DOD, and commercial space sectors. We review various activities in recent years aimed at understanding and mitigating radiation related risk in deploying fiber based data handling systems on orbit. Before concluding that there are no critical barriers to designing survivable and reliable systems, we analyze several possible types of radiation effects. Particular attention is given to the subject of particle-induced bit errors in InGaAs p-i-n photodiodes. Based on the test data, we present suggestions for error mitigation and present a method for on-orbit error rate prediction.","PeriodicalId":262646,"journal":{"name":"1996 IEEE Aerospace Applications Conference. Proceedings","volume":"51 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":"116376291","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: 54
Progress report on Mars Pathfinder Project approach 火星探路者计划的进展报告
1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.495888
A. Spear
{"title":"Progress report on Mars Pathfinder Project approach","authors":"A. Spear","doi":"10.1109/AERO.1996.495888","DOIUrl":"https://doi.org/10.1109/AERO.1996.495888","url":null,"abstract":"The Mars Pathfinder Project, one of NASA's first Discovery Class missions, will launch on December 2, 1996 and land on Mars on July 4, 1997 at low cost, fixed price, and on a short development schedule. This paper summarizes the mission, its science return and progress to date on its innovative \"Cheaper, Better, Faster\" project implementation approach.","PeriodicalId":262646,"journal":{"name":"1996 IEEE Aerospace Applications Conference. Proceedings","volume":"124 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":"128787983","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 software power model for a spin-stabilized LEO spacecraft utilizing V/T charge control 利用V/T电荷控制的自旋稳定LEO航天器的软件功率模型
1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.496065
B. Jackson
{"title":"A software power model for a spin-stabilized LEO spacecraft utilizing V/T charge control","authors":"B. Jackson","doi":"10.1109/AERO.1996.496065","DOIUrl":"https://doi.org/10.1109/AERO.1996.496065","url":null,"abstract":"A software power model has been developed which characterizes the performance of the electrical power subsystem of a spin-stabilized LEO spacecraft which uses an eight-level V/T controller to perform the charge control function. The model accurately simulates the operational performance of the solar array and power control unit, the charge/discharge characteristics of the batteries, and the time-varying nature of various electrical loads. The end result is a prediction of battery state-of-charge as a function of time for a specified period of operations. This allows mission planners to perform operational trades relating to payload usage, and enables more efficient payload tasking without endangering vehicle health.","PeriodicalId":262646,"journal":{"name":"1996 IEEE Aerospace Applications Conference. Proceedings","volume":"249 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":"121946598","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
Experiences with automated system testing and sleuth 有自动化系统测试和侦查的经验
1996 IEEE Aerospace Applications Conference. Proceedings Pub Date : 1996-02-03 DOI: 10.1109/AERO.1996.499671
T. Figliulo, A. von Mayrhauser, M. Shumway, R. Karcich
{"title":"Experiences with automated system testing and sleuth","authors":"T. Figliulo, A. von Mayrhauser, M. Shumway, R. Karcich","doi":"10.1109/AERO.1996.499671","DOIUrl":"https://doi.org/10.1109/AERO.1996.499671","url":null,"abstract":"Software system testing can be time consuming and tedious. While tool support exists, it does not always improve matters. This paper presents an approach towards tool-assisted software system testing using a variety of tools for automating tedious and time consuming tasks. We also integrated a new test suite generation tool into the system testing process. The paper reports on the experiences with this testing environment from the professional testers' perspective. Testing encompasses a variety of different approaches, including detailed feature-oriented testing, suspicion based investigation, and random testing. It also includes volume, stress, and operational profile testing. We were particularly interested in how well the new test generation tool performed for such widely varying test objectives.","PeriodicalId":262646,"journal":{"name":"1996 IEEE Aerospace Applications Conference. Proceedings","volume":"68 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":"121557377","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
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