Pub Date : 1994-05-23DOI: 10.1109/NAECON.1994.332911
H. Hanson, J. Christensen, J. Crabbe, R. Angle, A. Schlier, L. Peters
The Department of Defense (DoD) and Original Equipment Manufacturers (OEMs) face an increasingly difficult time supporting fielded systems due to a variety of factors. The generalized emulation microcircuit (GEM) program applies modern technology to provide an economical, rapid alternative to traditional redesign approaches. GEM provides form, fit, and function (FFF) replacement devices for unavailable microcircuits. GEM employs a modern BiCMOS gate array technology to produce these nonavailable devices. The GEM program utilizes specially designed gate arrays covering the range of specification requirements of the original device families. GEM parts are fabricated using modern, industry standard fabrication equipment employing statistical process control methods. The GEM design system employs commercial computer aided design, simulation, and verification tools in all phases of design.<>
{"title":"GEM-contemporary system support solutions","authors":"H. Hanson, J. Christensen, J. Crabbe, R. Angle, A. Schlier, L. Peters","doi":"10.1109/NAECON.1994.332911","DOIUrl":"https://doi.org/10.1109/NAECON.1994.332911","url":null,"abstract":"The Department of Defense (DoD) and Original Equipment Manufacturers (OEMs) face an increasingly difficult time supporting fielded systems due to a variety of factors. The generalized emulation microcircuit (GEM) program applies modern technology to provide an economical, rapid alternative to traditional redesign approaches. GEM provides form, fit, and function (FFF) replacement devices for unavailable microcircuits. GEM employs a modern BiCMOS gate array technology to produce these nonavailable devices. The GEM program utilizes specially designed gate arrays covering the range of specification requirements of the original device families. GEM parts are fabricated using modern, industry standard fabrication equipment employing statistical process control methods. The GEM design system employs commercial computer aided design, simulation, and verification tools in all phases of design.<<ETX>>","PeriodicalId":281754,"journal":{"name":"Proceedings of National Aerospace and Electronics Conference (NAECON'94)","volume":"22 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133812896","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}
Pub Date : 1994-05-23DOI: 10.1109/NAECON.1994.333055
Haixin Chen, Zhenkang Shen, Huihuang Chen
In spite of many advances of IR imaging technology that have been achieved, the detection of dim point target from infrared clutter backgrounds still remains a key problem in real-time IR system. We present a new detection scheme based on a linear detector and an improved probabilistic neural network classifier for small SNR, moving point targets detection in strong infrared noise and clutter backgrounds. Computer simulation was conducted, and simulation results confirmed the validity of the detection scheme.<>
{"title":"Detecting dim point target in infrared image sequences using probalilistic neural network","authors":"Haixin Chen, Zhenkang Shen, Huihuang Chen","doi":"10.1109/NAECON.1994.333055","DOIUrl":"https://doi.org/10.1109/NAECON.1994.333055","url":null,"abstract":"In spite of many advances of IR imaging technology that have been achieved, the detection of dim point target from infrared clutter backgrounds still remains a key problem in real-time IR system. We present a new detection scheme based on a linear detector and an improved probabilistic neural network classifier for small SNR, moving point targets detection in strong infrared noise and clutter backgrounds. Computer simulation was conducted, and simulation results confirmed the validity of the detection scheme.<<ETX>>","PeriodicalId":281754,"journal":{"name":"Proceedings of National Aerospace and Electronics Conference (NAECON'94)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129698778","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}
Pub Date : 1994-05-23DOI: 10.1109/NAECON.1994.332918
K. Das, M. Arif, A. Haider, M. S. Alam
Precise measurement of refractive index profile of an optical fiber is crucial for the measurement of different characteristics, such as the signal bandwidth of the fiber. We present a simple and inexpensive method for mapping the refractive index profile of an optical fiber. This method uses an interferometric technique to map the refractive index profile of a fiber. Comparing the index profile simulated theoretically with the experimental one, the difference between the refractive index of clad and that at the center of core for a graded index fiber was found to be 0.018. This technique also enables one to determine whether the fiber is a step index fiber or a graded index fiber.<>
{"title":"An interferometric technique for measuring the refractive index profile of a graded index optical fiber","authors":"K. Das, M. Arif, A. Haider, M. S. Alam","doi":"10.1109/NAECON.1994.332918","DOIUrl":"https://doi.org/10.1109/NAECON.1994.332918","url":null,"abstract":"Precise measurement of refractive index profile of an optical fiber is crucial for the measurement of different characteristics, such as the signal bandwidth of the fiber. We present a simple and inexpensive method for mapping the refractive index profile of an optical fiber. This method uses an interferometric technique to map the refractive index profile of a fiber. Comparing the index profile simulated theoretically with the experimental one, the difference between the refractive index of clad and that at the center of core for a graded index fiber was found to be 0.018. This technique also enables one to determine whether the fiber is a step index fiber or a graded index fiber.<<ETX>>","PeriodicalId":281754,"journal":{"name":"Proceedings of National Aerospace and Electronics Conference (NAECON'94)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129747694","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}
Pub Date : 1994-05-23DOI: 10.1109/NAECON.1994.333008
Gang-Yao Kuang, Zhongliang Lu, Su-yi
A method for characterizing radar signatures using HOMM (high-order moments modelling) is developed based on the high-order moments theory. This method consists of extracting radar target natural resonant frequencies by estimating the model of the radar target impulse response. In this paper,we analysed UWB radar target impulse response using high-order moments character on the base of the singularity expanding method, and made use of the total least squares method coupled with singularity value decomposition to accurately estimate the parameters of a rational of the impulse response.<>
{"title":"High-order moments modeling algorithm of radar target impulse response","authors":"Gang-Yao Kuang, Zhongliang Lu, Su-yi","doi":"10.1109/NAECON.1994.333008","DOIUrl":"https://doi.org/10.1109/NAECON.1994.333008","url":null,"abstract":"A method for characterizing radar signatures using HOMM (high-order moments modelling) is developed based on the high-order moments theory. This method consists of extracting radar target natural resonant frequencies by estimating the model of the radar target impulse response. In this paper,we analysed UWB radar target impulse response using high-order moments character on the base of the singularity expanding method, and made use of the total least squares method coupled with singularity value decomposition to accurately estimate the parameters of a rational of the impulse response.<<ETX>>","PeriodicalId":281754,"journal":{"name":"Proceedings of National Aerospace and Electronics Conference (NAECON'94)","volume":"74 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132055214","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}
Pub Date : 1994-05-23DOI: 10.1109/NAECON.1994.332951
M.J. Miedlar, W. Koenig
Generating real-time aircraft simulation software requires continuous access to personnel trained in specialized technical disciplines. These personnel may not be directly related to the intended use of the simulator or to the mission of the organization constructing the simulator. This paper discusses research performed under a Phase I Small Business Innovative Research (SBIR) into software that mould simplify the design and development of math model code and aerodynamic model code. The software uses Graphical User Interfaces (GUI) and a mouse for its interface. Prototype software was developed on a PC class machine running under Microsoft Windows.<>
{"title":"Automatic code generation for aerodynamic/math models","authors":"M.J. Miedlar, W. Koenig","doi":"10.1109/NAECON.1994.332951","DOIUrl":"https://doi.org/10.1109/NAECON.1994.332951","url":null,"abstract":"Generating real-time aircraft simulation software requires continuous access to personnel trained in specialized technical disciplines. These personnel may not be directly related to the intended use of the simulator or to the mission of the organization constructing the simulator. This paper discusses research performed under a Phase I Small Business Innovative Research (SBIR) into software that mould simplify the design and development of math model code and aerodynamic model code. The software uses Graphical User Interfaces (GUI) and a mouse for its interface. Prototype software was developed on a PC class machine running under Microsoft Windows.<<ETX>>","PeriodicalId":281754,"journal":{"name":"Proceedings of National Aerospace and Electronics Conference (NAECON'94)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114143609","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}
Pub Date : 1994-05-23DOI: 10.1109/NAECON.1994.332930
R. B. Bond
Grid sequencing, a technique used to reduce run times of solutions in computational fluid dynamics, was studied. A technique was developed to determine the time at which the solution should be transferred from one grid to another. The technique produced sequences that were either the fastest sequence or very close to the fastest sequence on multiple flow solvers using inviscid calculations. The method by which data is transferred from one grid to another was also tested. It was found that for the inviscid calculations, use of the fourth order interpolator and the linear interpolator produced results with insignificant differences in the same number of iterations.<>
{"title":"The possible time reduction of CFD solutions resulting from grid sequencing","authors":"R. B. Bond","doi":"10.1109/NAECON.1994.332930","DOIUrl":"https://doi.org/10.1109/NAECON.1994.332930","url":null,"abstract":"Grid sequencing, a technique used to reduce run times of solutions in computational fluid dynamics, was studied. A technique was developed to determine the time at which the solution should be transferred from one grid to another. The technique produced sequences that were either the fastest sequence or very close to the fastest sequence on multiple flow solvers using inviscid calculations. The method by which data is transferred from one grid to another was also tested. It was found that for the inviscid calculations, use of the fourth order interpolator and the linear interpolator produced results with insignificant differences in the same number of iterations.<<ETX>>","PeriodicalId":281754,"journal":{"name":"Proceedings of National Aerospace and Electronics Conference (NAECON'94)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132139186","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}
Pub Date : 1994-05-23DOI: 10.1109/NAECON.1994.332945
S. Walters
Real-time aircraft and avionics simulation computing is the foundation of systems used for testing embedded avionics software, for flight training simulation, and for engineering research simulation. Distribution of the simulation software over a set of smaller, inexpensive computers, in lieu of a traditional mainframe has been shown to dramatically reduce the cost of building a real-time simulation architecture. A true distributed architecture is also more cost effective than the latest generation of multiprocessor mainframes. The Advanced Multi-Purpose Support Environment (AMPSE), developed by the Avionics Logistics Branch of the Wright Laboratory (WL/AAAF) on the Embedded Computer Resources Support Improvement Program (ESIP), is an architecture and design methodology for distributed real-time simulation. It is a generic architecture that emphasizes modularity, reconfigurability, expandability, and software reuse. Other recent attempts at distributed real-time simulation systems have encountered significant performance difficulties due to inefficiencies in the approaches used for inter-processor communications and for scheduling and coordination of the distributed software execution. The systems engineering effort by WL/AAAF during AMPSE development focused on a careful design of these mechanisms. The resulting system achieves outstanding real-time performance through very efficient software scheduling and inter-processor communications while retaining a very modular, flexible, and reusable architectural approach.<>
{"title":"Practical techniques for distributed real-time simulation","authors":"S. Walters","doi":"10.1109/NAECON.1994.332945","DOIUrl":"https://doi.org/10.1109/NAECON.1994.332945","url":null,"abstract":"Real-time aircraft and avionics simulation computing is the foundation of systems used for testing embedded avionics software, for flight training simulation, and for engineering research simulation. Distribution of the simulation software over a set of smaller, inexpensive computers, in lieu of a traditional mainframe has been shown to dramatically reduce the cost of building a real-time simulation architecture. A true distributed architecture is also more cost effective than the latest generation of multiprocessor mainframes. The Advanced Multi-Purpose Support Environment (AMPSE), developed by the Avionics Logistics Branch of the Wright Laboratory (WL/AAAF) on the Embedded Computer Resources Support Improvement Program (ESIP), is an architecture and design methodology for distributed real-time simulation. It is a generic architecture that emphasizes modularity, reconfigurability, expandability, and software reuse. Other recent attempts at distributed real-time simulation systems have encountered significant performance difficulties due to inefficiencies in the approaches used for inter-processor communications and for scheduling and coordination of the distributed software execution. The systems engineering effort by WL/AAAF during AMPSE development focused on a careful design of these mechanisms. The resulting system achieves outstanding real-time performance through very efficient software scheduling and inter-processor communications while retaining a very modular, flexible, and reusable architectural approach.<<ETX>>","PeriodicalId":281754,"journal":{"name":"Proceedings of National Aerospace and Electronics Conference (NAECON'94)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128523575","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}
Pub Date : 1994-05-23DOI: 10.1109/NAECON.1994.332873
P. Donoghue, G. L. Larson, S. Dondoe
This paper highlights the development of a full authority electronic drive control system (commonly termed "drive-by-wire"). The system is designed to operate within the larger integrated vehicle electronic system (vetronic) architecture established for ground vehicles. It employs a number of modes which control the vehicle dynamics, track tension, suspension, and ride qualities. Through a dual-redundant computer architecture, drive-by-wire (DBW) affects all aspects of the vehicle dynamics, control, and mobility. One of the most significant aspects of this control system is it's capability to alter the maneuverability and handling qualities of the vehicle through dynamic compensation DBW control laws provide improved stability and shape the driver control commands through active feedback. The vehicle's augmented dynamics significantly extend the performance capabilities as well as enhance the safety characteristics.<>
{"title":"Extending technology to drive by wire control","authors":"P. Donoghue, G. L. Larson, S. Dondoe","doi":"10.1109/NAECON.1994.332873","DOIUrl":"https://doi.org/10.1109/NAECON.1994.332873","url":null,"abstract":"This paper highlights the development of a full authority electronic drive control system (commonly termed \"drive-by-wire\"). The system is designed to operate within the larger integrated vehicle electronic system (vetronic) architecture established for ground vehicles. It employs a number of modes which control the vehicle dynamics, track tension, suspension, and ride qualities. Through a dual-redundant computer architecture, drive-by-wire (DBW) affects all aspects of the vehicle dynamics, control, and mobility. One of the most significant aspects of this control system is it's capability to alter the maneuverability and handling qualities of the vehicle through dynamic compensation DBW control laws provide improved stability and shape the driver control commands through active feedback. The vehicle's augmented dynamics significantly extend the performance capabilities as well as enhance the safety characteristics.<<ETX>>","PeriodicalId":281754,"journal":{"name":"Proceedings of National Aerospace and Electronics Conference (NAECON'94)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134338786","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}
Pub Date : 1994-05-23DOI: 10.1109/NAECON.1994.332928
M. Alam
In this paper, a simple recoded trinary signed-digit (TSD) number representation for parallel optical computing is proposed. This technique performs multi-digit carry-free addition and borrow-free subtraction in constant time using only 50% of the minterms required in the most recently reported TSD arithmetic technique.<>
{"title":"Optical carry-free addition and borrow-free subtraction using signed-digit numbers","authors":"M. Alam","doi":"10.1109/NAECON.1994.332928","DOIUrl":"https://doi.org/10.1109/NAECON.1994.332928","url":null,"abstract":"In this paper, a simple recoded trinary signed-digit (TSD) number representation for parallel optical computing is proposed. This technique performs multi-digit carry-free addition and borrow-free subtraction in constant time using only 50% of the minterms required in the most recently reported TSD arithmetic technique.<<ETX>>","PeriodicalId":281754,"journal":{"name":"Proceedings of National Aerospace and Electronics Conference (NAECON'94)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122069604","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}
Pub Date : 1994-05-23DOI: 10.1109/NAECON.1994.332946
H. Maney
By far, the most popular applications for object-oriented programming (OOP) are those dealing with graphical user interfaces. This is not surprising. An association between a visible element on a display and a computer language object seems natural. In the field of radar signal processing, however, the use of objects is less common. A primary reason for the lack of popularity of OOP for signal processing is the perception that OOP languages generate slower executing code than procedural languages. As OOP languages mature and computers become faster, this becomes less of a concern. The tools of OOP (data encapsulation, inheritance, polymorphism,) can be just as useful to radar signal processor developers as they are to user interface developers. They increase the level of abstraction available to the developer, allowing him or her to concentrate more on the solution to a problem and less on the implementation of it. The tools allow the developer to produce truly reusable code, reducing the amount of debugging needed in later projects. The end result can be higher developer productivity and more reliable code. This paper describes an implementation of a complete synthetic aperture radar (SAR) processor in C++. Raw radar data collected using the Norden AN/APG-76 Multi-mode Radar aboard Norden's Gulfstream II test aircraft were used as input to the C++ processor. The processor was evaluated for speed and accuracy in comparison with an equivalent FORTRAN processor and the AN/APG-76 processor. This test indicated that the APG-76 processing speed was equivalent to 70 SGI/MIPS R4000 50/100's programmed in FORTRAN or C++. The ease or difficulties encountered in porting the processor to several machine types are documented. The resulting high-resolution radar image is compared with the AN/APG-76 real-time image. The major classes are described. Rationale for class designs is provided and the overall benefits of OOP are evaluated.<>
{"title":"An object-oriented synthetic aperture radar processor implemented using C++ classes","authors":"H. Maney","doi":"10.1109/NAECON.1994.332946","DOIUrl":"https://doi.org/10.1109/NAECON.1994.332946","url":null,"abstract":"By far, the most popular applications for object-oriented programming (OOP) are those dealing with graphical user interfaces. This is not surprising. An association between a visible element on a display and a computer language object seems natural. In the field of radar signal processing, however, the use of objects is less common. A primary reason for the lack of popularity of OOP for signal processing is the perception that OOP languages generate slower executing code than procedural languages. As OOP languages mature and computers become faster, this becomes less of a concern. The tools of OOP (data encapsulation, inheritance, polymorphism,) can be just as useful to radar signal processor developers as they are to user interface developers. They increase the level of abstraction available to the developer, allowing him or her to concentrate more on the solution to a problem and less on the implementation of it. The tools allow the developer to produce truly reusable code, reducing the amount of debugging needed in later projects. The end result can be higher developer productivity and more reliable code. This paper describes an implementation of a complete synthetic aperture radar (SAR) processor in C++. Raw radar data collected using the Norden AN/APG-76 Multi-mode Radar aboard Norden's Gulfstream II test aircraft were used as input to the C++ processor. The processor was evaluated for speed and accuracy in comparison with an equivalent FORTRAN processor and the AN/APG-76 processor. This test indicated that the APG-76 processing speed was equivalent to 70 SGI/MIPS R4000 50/100's programmed in FORTRAN or C++. The ease or difficulties encountered in porting the processor to several machine types are documented. The resulting high-resolution radar image is compared with the AN/APG-76 real-time image. The major classes are described. Rationale for class designs is provided and the overall benefits of OOP are evaluated.<<ETX>>","PeriodicalId":281754,"journal":{"name":"Proceedings of National Aerospace and Electronics Conference (NAECON'94)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122215647","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}
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