Proceedings of the IEEE 1998 National Aerospace and Electronics Conference. NAECON 1998. Celebrating 50 Years (Cat. No.98CH36185)最新文献

{"title":"Polarization radar target recognition based on optimal curve fitting","authors":"Tao Huamin, Y. Jianjun, Zhao Chunlei","doi":"10.1109/NAECON.1998.710148","DOIUrl":"https://doi.org/10.1109/NAECON.1998.710148","url":null,"abstract":"In this paper, the conception of VOPS (Velocity of Polarization State) is presented to describe the dynamic characteristics of radar target's polarization structure in the frequency domain an the polarimetric and high-resolution radar system. An improved simulated annealing method is presented to estimate the global optimal parameters of fitting curves of target's dynamic distributions. Furthermore, recognition experiment has been made on four kinds of aircraft and good results are achieved.","PeriodicalId":202280,"journal":{"name":"Proceedings of the IEEE 1998 National Aerospace and Electronics Conference. NAECON 1998. Celebrating 50 Years (Cat. No.98CH36185)","volume":"280 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123067790","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}

{"title":"Adaptive connection management for mission critical applications over ATM networks","authors":"A. Sahoo, B. Devalla, Y. Guan, R. Bettati, W. Zhao","doi":"10.1109/NAECON.1998.710107","DOIUrl":"https://doi.org/10.1109/NAECON.1998.710107","url":null,"abstract":"This paper focuses on connection management for mission critical real-time applications over ATM networks. Traditional connection management generally requires Quality-of-Service (QoS) parameters to be specified as fixed values, and can only provide a QoS that is constant throughout the lifetime of an admitted connection. Such simplistic specification and consequent resource management offer no flexibility to user applications. The applications cannot receive the best possible QoS, and system resources are grossly under-utilized. We take an adaptive approach. With our adaptive connection management, QoS of connections is specified over a range of values. Resources are reallocated and redistributed in response to dynamic fluctuations in resource availability. With our adaptive strategy, we demonstrate dramatic improvements in both the offered QoS to applications, and the effective utilization of system resources. Our approach is practical and compatible with current networking standards. We have implemented adaptive connection management in a newer version of our real-time toolkit, NetEx NetEx provides delay guaranteed communication services for mission critical real-time applications over high-speed networks.","PeriodicalId":202280,"journal":{"name":"Proceedings of the IEEE 1998 National Aerospace and Electronics Conference. NAECON 1998. Celebrating 50 Years (Cat. No.98CH36185)","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114825676","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}

{"title":"The manufacturing development guide: a new Air Force paradigm for best value weapon system acquisition","authors":"R. M. Craven","doi":"10.1109/NAECON.1998.710098","DOIUrl":"https://doi.org/10.1109/NAECON.1998.710098","url":null,"abstract":"This paper introduces the 1998 version of the Air Force Aeronautical Systems Center's Manufacturing Development Guide (MDG). The new MDG is a complete rewrite of a breakthrough acquisition guide first published in 1993. It is the culmination of a three year effort to produce a comprehensive guidance document to help identify and implement on weapon system acquisition programs the appropriate systems, processes, tools, and techniques that facilitated the quality revolution in the commercial sector. As acquisition reform, having the same ultimate objective, continues to gain momentum, the MDG will also serve to provide guidance on implementing numerous new initiatives related to this \"New Way of Doing Business\" (June 1994). The expected audience for the MDG includes Air Force personnel working in weapon system acquisition program offices and their defense contractor counterparts.","PeriodicalId":202280,"journal":{"name":"Proceedings of the IEEE 1998 National Aerospace and Electronics Conference. NAECON 1998. Celebrating 50 Years (Cat. No.98CH36185)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114491692","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}

{"title":"Information assessment of SAR data for ATR","authors":"Erik Blasch, M. Bryant","doi":"10.1109/NAECON.1998.710144","DOIUrl":"https://doi.org/10.1109/NAECON.1998.710144","url":null,"abstract":"Without successful adaptive multisensor fusion or online registration techniques, automatic target recognition (ATR) algorithms are prone to poor object classifications. Multisensor fusion for a given situation assessment includes identifying measurement information for task completion and reducing image uncertainty in the presence of clutter. By extracting synthetic aperture radar (SAR) image informational features, image registration and target classification is achievable. This paper examines SAR information-theoretic features for a target orientation and proposes a method for target classification.","PeriodicalId":202280,"journal":{"name":"Proceedings of the IEEE 1998 National Aerospace and Electronics Conference. NAECON 1998. Celebrating 50 Years (Cat. No.98CH36185)","volume":"417 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124191081","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}

{"title":"Applications of unsupervised clustering algorithms to aircraft identification using high range resolution radar","authors":"D. T. Pham","doi":"10.1109/NAECON.1998.710121","DOIUrl":"https://doi.org/10.1109/NAECON.1998.710121","url":null,"abstract":"Identification of aircraft from high range resolution (HRR) radar range profiles requires a database of information capturing the variability of the individual range profiles as a function of viewing aspect. This database can be a collection of individual signatures or a collection of average signatures distributed over the region of viewing aspect of interest. An efficient database is one which captures the intrinsic variability of the HRR signatures without either excessive redundancy (over-characterization) typical of single-signature databases or without the loss of information (under-characterization) common when averaging arbitrary group of signatures. The identification of \"natural\" clustering of similar HRR signatures provides a means for creating efficient databases of either individual signatures or of signature templates. Using a k-means and the Kohonen self-organizing feature net, we identify the natural clustering of the HRR radar range profiles into groups of similar signatures based on the match quality metric (Euclidean distance) used within a Vector quantizer (VQ) classification algorithm. This greatly reduces the redundancy in such databases while retaining classification performance. Such clusters can be useful in template-based algorithms where groups of signatures are averaged to produce a template. Instead of basing the group of signatures to be averaged on arbitrary regions of viewing aspect, the averages are taken over the signatures contained in the natural clusters which have been Identified. The benefits of applying natural cluster identification to individual-signature HRR data preparation are decreased algorithm memory and computational requirements with a consequent decrease in the time required to perform identification calculations. When applied to template databases the benefits are improved identification performance. This paper describes the techniques used for identifying HRR signature clusters and describes the statistical properties of such clusters.","PeriodicalId":202280,"journal":{"name":"Proceedings of the IEEE 1998 National Aerospace and Electronics Conference. NAECON 1998. Celebrating 50 Years (Cat. No.98CH36185)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129093163","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}

{"title":"Output power characteristics of cooled power PHEMT MMICs","authors":"V. Sokolov, T. Childs, R. Dwarkin, P. Cheung","doi":"10.1109/NAECON.1998.710221","DOIUrl":"https://doi.org/10.1109/NAECON.1998.710221","url":null,"abstract":"Saturated power output characteristics of monolithic microwave (and mm-wave) integrated circuit (MMIC) power amplifiers incorporating double heterojunction InGaAs-channel PHEMTs (pseudomorphic high electron mobility transistors) operating at different base plate temperatures are compared. While it is generally expected that ideal PHEMTs have greater output power at lower temperatures, it is shown experimentally that this is not always the case. Indeed, the saturated output power does not necessarily follow the same trends with temperature as the corresponding small signal gain characteristics. In some cases the saturated output power is less at lower temperatures despite and increase in the corresponding small signal gain. Furthermore, the same monolithic circuit design may behave differently with temperature depending on the specific PHEMT wafer from which it was fabricated. Guidelines are presented for the selection of suitable PHEMT epitaxial material for increasing saturated output power at lower temperatures.","PeriodicalId":202280,"journal":{"name":"Proceedings of the IEEE 1998 National Aerospace and Electronics Conference. NAECON 1998. Celebrating 50 Years (Cat. No.98CH36185)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115675945","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}

{"title":"3-D interconnected porous AlN composite: a viable substrate for electronic packaging","authors":"J. Y. Kim, P. Kumta","doi":"10.1109/NAECON.1998.710225","DOIUrl":"https://doi.org/10.1109/NAECON.1998.710225","url":null,"abstract":"A simple conventional ceramic processing method was used. To fabricate 3-D interconnected porous aluminum nitride composites. To demonstrate this and show their applicability as substrates in electronic packaging aluminum nitride powders were cold pressed and sintered under controlled conditions of temperature and time to initiate particle necking and coarsening, but with minimum shrinkage. Initial densification studies show the formation of porous ceramics (/spl sime/30% porosity) containing contiguous pores. The composite exhibits a maximum, thermal conductivity of 40 W/m-K and a dielectric constant of 4.73. The thermal conductivity of these composites, however, tends to increase drastically with an increase in the sintering temperature and time, while maintaining the volume fraction of aluminum nitride nearly constant. On the other hand the dielectric constant appears to be independent of the sintering temperature and time. Borsphosphosilicate glass was also infiltrated into the porous AlN composite to form a partially glass-infiltrated 3-D interconnected porous AlN composite. These composites were characterized at room temperature for their thermal conductivity and dielectric constant. Results of these studies show the potential of such composites for use as substrata in electronic packaging.","PeriodicalId":202280,"journal":{"name":"Proceedings of the IEEE 1998 National Aerospace and Electronics Conference. NAECON 1998. Celebrating 50 Years (Cat. No.98CH36185)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131488216","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}

{"title":"Air target algorithm development (ATAD)","authors":"B. Overfield, Jason Thomas, M. Cohen, V. Sylvester, R. Rogers, D. Morgan","doi":"10.1109/NAECON.1998.710104","DOIUrl":"https://doi.org/10.1109/NAECON.1998.710104","url":null,"abstract":"The Combat Air Forces have invested heavily in a sensor and weapon capability to detect and attack air targets at long ranges. Unfortunately, the ability to identify these targets lags behind these capabilities. Under the Air Force sponsored Air Target Algorithm Development (ATAD) program, model-based reasoning (MBR) fusion algorithms have been developed and demonstrated for improved air target identification (ID). The expected payoff is a robust ID algorithm that offers improved timelines, increased ID confidence, enhanced target aspect performance, robustness to countermeasures, and longer ID ranges. The technology is applicable to all current and future fighter aircraft.","PeriodicalId":202280,"journal":{"name":"Proceedings of the IEEE 1998 National Aerospace and Electronics Conference. NAECON 1998. Celebrating 50 Years (Cat. No.98CH36185)","volume":"168 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123467726","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}

{"title":"An overview of the IRIDIUM (R) low Earth orbit (LEO) satellite system","authors":"C. Fossa, R. Raines, G. Gunsch, Michael A. Temple","doi":"10.1109/NAECON.1998.710110","DOIUrl":"https://doi.org/10.1109/NAECON.1998.710110","url":null,"abstract":"This paper provides a tutorial overview of the IRIDIUM(R) low earth orbit (LEO) satellite system. Section I contains an introduction to the IRIDIUM(R) network as well as the system specifications. Section II discusses the satellite constellation design, orbital parameters, and horizontal pointing angles between satellites. Section III introduces the idea of time dependent connectivity in a mobile network, and analyzes the cycle of network connectivity for IRIDIUM(R). Section IV discusses the IRIDIUM(R) Time Division Multiple Access (TDMA) and Frequency Division Multiple Access (FDMA) schemes and uses these to calculate the overall system capacity. Section V examines the call processing procedure to include user location and call set up. Finally, Section VI analyzes the network performance in terms of end-to-end delay and hop count.","PeriodicalId":202280,"journal":{"name":"Proceedings of the IEEE 1998 National Aerospace and Electronics Conference. NAECON 1998. Celebrating 50 Years (Cat. No.98CH36185)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128150272","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}

{"title":"Affordable software design for an open systems hardware architecture","authors":"J.P. Janzer, R.N. Ladage","doi":"10.1109/NAECON.1998.710115","DOIUrl":"https://doi.org/10.1109/NAECON.1998.710115","url":null,"abstract":"With shrinking defense budgets, creating affordable software without decreasing performance is quickly becoming a requirement for obtaining new government contracts. Minimizing life cycle cost (LCC) becomes a key goal in achieving affordability. In a modern world with technology advances occurring at an exponential rate, it is becoming increasingly more difficult to design an embedded system architecture that can withstand significant design impacts to accommodate changes in the hardware it controls. This is the challenge proposed by the Integrated Sensor System (ISS) program, which utilizes Open Systems Architecture (OSA) concepts for designing an integrated Radio Frequency (RF) avionics system. ISS envisions a shared resource concept for performing RF functions and has been designed to easily accept advances in technology to enhance RF performance throughout the life of the host aircraft. This paper outlines the ISS control software architecture developed by an inter-company team of software engineers led by Boeing. The paper identifies how the architecture minimizes LCC by reducing software impacts resulting from hardware changes and emphasizes how the design could be applied successfully for any resource-sharing system.","PeriodicalId":202280,"journal":{"name":"Proceedings of the IEEE 1998 National Aerospace and Electronics Conference. NAECON 1998. Celebrating 50 Years (Cat. No.98CH36185)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121477002","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}