Pub Date : 1991-05-20DOI: 10.1109/NAECON.1991.165760
R.G. Kaseta
A critical factor in long-term data reliability in a rigid disk drive, namely an accurate head positioning system that can cope with mechanical problems induced by the environment, is examined. It is noted that ensuring reliable data recovery under harsh environments requires the application of new techniques in servo positioning. A way to compensate for many of the errors is to provide some method of position feedback from each data head in addition to the position feedback available from the dedicated servo surface. If a data head misposition relative to its data track can be determined then the appropriate position correction can be applied. Several approaches available to the disk drive designer to provide position feedback from each data head are discussed. The achievement of tolerance to transmitted shock and vibration is also considered.<>
{"title":"Rigid disk drive data reliability in harsh environments","authors":"R.G. Kaseta","doi":"10.1109/NAECON.1991.165760","DOIUrl":"https://doi.org/10.1109/NAECON.1991.165760","url":null,"abstract":"A critical factor in long-term data reliability in a rigid disk drive, namely an accurate head positioning system that can cope with mechanical problems induced by the environment, is examined. It is noted that ensuring reliable data recovery under harsh environments requires the application of new techniques in servo positioning. A way to compensate for many of the errors is to provide some method of position feedback from each data head in addition to the position feedback available from the dedicated servo surface. If a data head misposition relative to its data track can be determined then the appropriate position correction can be applied. Several approaches available to the disk drive designer to provide position feedback from each data head are discussed. The achievement of tolerance to transmitted shock and vibration is also considered.<<ETX>>","PeriodicalId":247766,"journal":{"name":"Proceedings of the IEEE 1991 National Aerospace and Electronics Conference NAECON 1991","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126262163","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 : 1991-05-20DOI: 10.1109/NAECON.1991.165735
Yisu Xu, Zhaoda Zhu
The authors describe an arc projection algorithm applied to radar imaging in a near-field case. In a close area, the samples of echo signal are no longer pure frequency-domain data due to wavefront curvature. In such cases, it is not proper to process echo signals by utilizing traditional imaging methods. The authors propose the idea of near-field correction. Combining it with the convolution backprojection (CBP) algorithm, an arc projection algorithm is obtained. Computer simulation results obtained by processing echo signals in the near-field using the arc projection algorithm and the conventional CBP algorithm are presented and compared.<>
{"title":"An arc projection algorithm applied to near-field radar imaging","authors":"Yisu Xu, Zhaoda Zhu","doi":"10.1109/NAECON.1991.165735","DOIUrl":"https://doi.org/10.1109/NAECON.1991.165735","url":null,"abstract":"The authors describe an arc projection algorithm applied to radar imaging in a near-field case. In a close area, the samples of echo signal are no longer pure frequency-domain data due to wavefront curvature. In such cases, it is not proper to process echo signals by utilizing traditional imaging methods. The authors propose the idea of near-field correction. Combining it with the convolution backprojection (CBP) algorithm, an arc projection algorithm is obtained. Computer simulation results obtained by processing echo signals in the near-field using the arc projection algorithm and the conventional CBP algorithm are presented and compared.<<ETX>>","PeriodicalId":247766,"journal":{"name":"Proceedings of the IEEE 1991 National Aerospace and Electronics Conference NAECON 1991","volume":"159 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113983929","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 : 1991-05-20DOI: 10.1109/NAECON.1991.165900
K. Kastella
It is demonstrated that simulated annealing (SA) is a viable optimization method for use in route optimization for aircraft flying in tactical attack roles at low altitude deep in enemy territory. It is found that adaptive control of the temperature based on a heuristic measure of equilibrium greatly reduces the algorithm's sensitivity to the cooling rate while giving a 5- to 10-fold speed-up with no adverse impact on the quality of the solutions produced. These results scale nearly linearly with problem size.<>
{"title":"Aircraft route optimization using adaptive simulated annealing","authors":"K. Kastella","doi":"10.1109/NAECON.1991.165900","DOIUrl":"https://doi.org/10.1109/NAECON.1991.165900","url":null,"abstract":"It is demonstrated that simulated annealing (SA) is a viable optimization method for use in route optimization for aircraft flying in tactical attack roles at low altitude deep in enemy territory. It is found that adaptive control of the temperature based on a heuristic measure of equilibrium greatly reduces the algorithm's sensitivity to the cooling rate while giving a 5- to 10-fold speed-up with no adverse impact on the quality of the solutions produced. These results scale nearly linearly with problem size.<<ETX>>","PeriodicalId":247766,"journal":{"name":"Proceedings of the IEEE 1991 National Aerospace and Electronics Conference NAECON 1991","volume":"360 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114008376","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 : 1991-05-20DOI: 10.1109/NAECON.1991.165899
A. Selvam
It is noted that the observed long-range spatio-temporal correlations of real-world dynamical systems are governed by quantum-like mechanics with inherent nonlocal connections. Microscopic-scale local fluctuations form a unified self-organized adaptive network manifested as the macroscale dynamical system with implicit ordered energy flow between the larger and smaller scales. Such a concept of ladder networks may find applications in the design of artificial intelligence systems. Deterministic chaos and quantum-like mechanics in atmospheric flows is considered. Data from summer monsoon (June-September) rainfall values for 29 meteorological sub-divisions for 115 years (1871-1985) were analyzed.<>
{"title":"Deterministic chaos: a signature of quantum-like mechanics in self-organized adaptive network","authors":"A. Selvam","doi":"10.1109/NAECON.1991.165899","DOIUrl":"https://doi.org/10.1109/NAECON.1991.165899","url":null,"abstract":"It is noted that the observed long-range spatio-temporal correlations of real-world dynamical systems are governed by quantum-like mechanics with inherent nonlocal connections. Microscopic-scale local fluctuations form a unified self-organized adaptive network manifested as the macroscale dynamical system with implicit ordered energy flow between the larger and smaller scales. Such a concept of ladder networks may find applications in the design of artificial intelligence systems. Deterministic chaos and quantum-like mechanics in atmospheric flows is considered. Data from summer monsoon (June-September) rainfall values for 29 meteorological sub-divisions for 115 years (1871-1985) were analyzed.<<ETX>>","PeriodicalId":247766,"journal":{"name":"Proceedings of the IEEE 1991 National Aerospace and Electronics Conference NAECON 1991","volume":"204 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123860003","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 : 1991-05-20DOI: 10.1109/NAECON.1991.165791
G. Prescott, J. M. Bargallo
The performance of a trellis coded four phase differential phase shift keying (TC QDPSK) modem with symbol decoding is compared with a continuous phase frequency shift keying (CPFSK) modem using noncoherent detection. The bit error rate (BER) performance as a function of signal-to-noise ratio per bit is obtained by simulation of both systems. It is shown that the trellis coded system provides a better BER performance for a given signal-to-noise ratio per bit. The bandwidth requirements for both systems are analyzed and compared. The TC 4DPSK system trades off part of the maximum achievable coding gain for a simpler implementation.<>
{"title":"Compared performances of trellis coded QDPSK modulation and CPFSK modulation with discrimination detection","authors":"G. Prescott, J. M. Bargallo","doi":"10.1109/NAECON.1991.165791","DOIUrl":"https://doi.org/10.1109/NAECON.1991.165791","url":null,"abstract":"The performance of a trellis coded four phase differential phase shift keying (TC QDPSK) modem with symbol decoding is compared with a continuous phase frequency shift keying (CPFSK) modem using noncoherent detection. The bit error rate (BER) performance as a function of signal-to-noise ratio per bit is obtained by simulation of both systems. It is shown that the trellis coded system provides a better BER performance for a given signal-to-noise ratio per bit. The bandwidth requirements for both systems are analyzed and compared. The TC 4DPSK system trades off part of the maximum achievable coding gain for a simpler implementation.<<ETX>>","PeriodicalId":247766,"journal":{"name":"Proceedings of the IEEE 1991 National Aerospace and Electronics Conference NAECON 1991","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122083810","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 : 1991-05-20DOI: 10.1109/NAECON.1991.165778
Yuan Cheng, J. Hung
In the case when a satellite launch vehicle is required to perform both large pitch and yaw angles in the coasting flight phase, one can utilize the programmed pitch around the outer gimbal axis of the platform and torquing the inner gimbal gyro simultaneously to realize it. In this case, it is not necessary to use the complicated four gimbal platform to fulfil the flight mission. The relationships between the vehicle's attitude angles are discussed in detail. The design scheme for implementation of stable-element precession is also presented.<>
{"title":"On the control of the inertial platform for a satellite launch vehicle having large attitude angles","authors":"Yuan Cheng, J. Hung","doi":"10.1109/NAECON.1991.165778","DOIUrl":"https://doi.org/10.1109/NAECON.1991.165778","url":null,"abstract":"In the case when a satellite launch vehicle is required to perform both large pitch and yaw angles in the coasting flight phase, one can utilize the programmed pitch around the outer gimbal axis of the platform and torquing the inner gimbal gyro simultaneously to realize it. In this case, it is not necessary to use the complicated four gimbal platform to fulfil the flight mission. The relationships between the vehicle's attitude angles are discussed in detail. The design scheme for implementation of stable-element precession is also presented.<<ETX>>","PeriodicalId":247766,"journal":{"name":"Proceedings of the IEEE 1991 National Aerospace and Electronics Conference NAECON 1991","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122096834","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 : 1991-05-20DOI: 10.1109/NAECON.1991.165801
J. Anderson
The author discusses the effects of pump displacement on electro-hydrostatic actuator (EHA) performance characteristics and the possible advantages of using a variable displacement pump in an EHA. Issues discussed are heating, size, and stiffness. It is noted that the EHA offers the possibility of varying the coupling ratio by varying the pump displacement. The variable coupling ratio could be used to increase actuator stiffness, to decrease package size, and to decrease package heating. An EHA employing a variable displacement pump has been designed and built, and the actuator will be tested once assembly of the package is completed.<>
{"title":"Variable displacement electro-hydrostatic actuator","authors":"J. Anderson","doi":"10.1109/NAECON.1991.165801","DOIUrl":"https://doi.org/10.1109/NAECON.1991.165801","url":null,"abstract":"The author discusses the effects of pump displacement on electro-hydrostatic actuator (EHA) performance characteristics and the possible advantages of using a variable displacement pump in an EHA. Issues discussed are heating, size, and stiffness. It is noted that the EHA offers the possibility of varying the coupling ratio by varying the pump displacement. The variable coupling ratio could be used to increase actuator stiffness, to decrease package size, and to decrease package heating. An EHA employing a variable displacement pump has been designed and built, and the actuator will be tested once assembly of the package is completed.<<ETX>>","PeriodicalId":247766,"journal":{"name":"Proceedings of the IEEE 1991 National Aerospace and Electronics Conference NAECON 1991","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116913002","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 : 1991-05-20DOI: 10.1109/NAECON.1991.165923
M. J. Barche, W. Rieder
Attention is given to the Automated Explosive Site Planner (AESP), a software system developed at Headquarters Air Force Logistics Command (HQ AFLC) to tackle many of the problems encountered with developing an explosives site plan and completing AFLC Form 333, 'Explosives Authorization For Sited Munitions Facility'. This system consists of three separate, but coordinated, programs that maintain a site database containing information on structures in and around the explosives storage area; establish minimum quantity-distance separations between the proposed structure and surrounding structures based on Air Force regulation 127-100, chapter 5; identify previously sited structures whose maximum net explosive weights must be reduced due to the introduction/placement of the proposed structure; and complete AFLC Form 333. Programs 1 and 3 of this system were designed using conventional techniques and coded in a conventional programming language (TURBO Pascal). Program 2 employs artificial intelligence techniques and was coded using expert system development software (M.1).<>
{"title":"Automated Explosive Site Planner: a software system for siting explosives","authors":"M. J. Barche, W. Rieder","doi":"10.1109/NAECON.1991.165923","DOIUrl":"https://doi.org/10.1109/NAECON.1991.165923","url":null,"abstract":"Attention is given to the Automated Explosive Site Planner (AESP), a software system developed at Headquarters Air Force Logistics Command (HQ AFLC) to tackle many of the problems encountered with developing an explosives site plan and completing AFLC Form 333, 'Explosives Authorization For Sited Munitions Facility'. This system consists of three separate, but coordinated, programs that maintain a site database containing information on structures in and around the explosives storage area; establish minimum quantity-distance separations between the proposed structure and surrounding structures based on Air Force regulation 127-100, chapter 5; identify previously sited structures whose maximum net explosive weights must be reduced due to the introduction/placement of the proposed structure; and complete AFLC Form 333. Programs 1 and 3 of this system were designed using conventional techniques and coded in a conventional programming language (TURBO Pascal). Program 2 employs artificial intelligence techniques and was coded using expert system development software (M.1).<<ETX>>","PeriodicalId":247766,"journal":{"name":"Proceedings of the IEEE 1991 National Aerospace and Electronics Conference NAECON 1991","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115066208","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 : 1991-05-20DOI: 10.1109/NAECON.1991.165822
P. H. Luckey, R. M. Pittman
In response to a trainer system contract opportunity, the Trainer and Simulation department located at IBM's Owego, NY facility undertook a transition from a more traditional software development approach to an integrated environment comprising state-of-the-art hardware, tools, and a selected software development methodology. The pre-integration development environment is discussed. The chosen environment implementation is also discussed, including the CASE (computer-aided software engineering) Real-Time Curriculum. This curriculum describes a software requirement and design development method applied to develop reusable, object-oriented domain models. Technical considerations driving the implementation of the heterogeneous environment comprising IBM and vendor products are addressed. The 1997 status of the CASE environment, with a look towards its future capabilities, is also discussed.<>
{"title":"Improving software quality utilizing an integrated CASE environment","authors":"P. H. Luckey, R. M. Pittman","doi":"10.1109/NAECON.1991.165822","DOIUrl":"https://doi.org/10.1109/NAECON.1991.165822","url":null,"abstract":"In response to a trainer system contract opportunity, the Trainer and Simulation department located at IBM's Owego, NY facility undertook a transition from a more traditional software development approach to an integrated environment comprising state-of-the-art hardware, tools, and a selected software development methodology. The pre-integration development environment is discussed. The chosen environment implementation is also discussed, including the CASE (computer-aided software engineering) Real-Time Curriculum. This curriculum describes a software requirement and design development method applied to develop reusable, object-oriented domain models. Technical considerations driving the implementation of the heterogeneous environment comprising IBM and vendor products are addressed. The 1997 status of the CASE environment, with a look towards its future capabilities, is also discussed.<<ETX>>","PeriodicalId":247766,"journal":{"name":"Proceedings of the IEEE 1991 National Aerospace and Electronics Conference NAECON 1991","volume":"652 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127540517","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 : 1991-05-20DOI: 10.1109/NAECON.1991.165915
W. D. Willis, L.J. Duchesneau
SMARTNet-2 was developed to provide a high-speed shared memory network for support of real-time parallel processing. Rapid prototyping put early versions of the SMARTNet-2 Diagnostic Software on the various computers being used for hardware board development and testing. This provided quick feedback to the hardware design engineers and ensured that all addressable hardware could be accessed by the software. As the hardware matured and new parts were added it was fairly simple to update the software to accommodate the new hardware. The authors detail the unique aspects of the design and implementation of the SMARTNet-2 diagnostic software. In addition, they discuss the command language and the methods used to achieve fault isolation testing.<>
{"title":"Diagnostic software for SMARTNet-2","authors":"W. D. Willis, L.J. Duchesneau","doi":"10.1109/NAECON.1991.165915","DOIUrl":"https://doi.org/10.1109/NAECON.1991.165915","url":null,"abstract":"SMARTNet-2 was developed to provide a high-speed shared memory network for support of real-time parallel processing. Rapid prototyping put early versions of the SMARTNet-2 Diagnostic Software on the various computers being used for hardware board development and testing. This provided quick feedback to the hardware design engineers and ensured that all addressable hardware could be accessed by the software. As the hardware matured and new parts were added it was fairly simple to update the software to accommodate the new hardware. The authors detail the unique aspects of the design and implementation of the SMARTNet-2 diagnostic software. In addition, they discuss the command language and the methods used to achieve fault isolation testing.<<ETX>>","PeriodicalId":247766,"journal":{"name":"Proceedings of the IEEE 1991 National Aerospace and Electronics Conference NAECON 1991","volume":"48 2 Suppl 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121195669","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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