The authors review several areas in which microwave components and/or systems have been integrated with digital electronics to provide enhanced performance of the microwave hardware or functions which were previously unattainable. Several areas in which this combined microwave/digital technology is already being used or in which usage is proposed are discussed. Particular attention is given to the application of this combined technology to high-speed logic, measurement equipment, electronic countermeasures, computer-aided design, radars and adaptive systems, digital radio, and automated production testing. In addition, specific applications of digital enhancement to microwave attenuation, a phase shifter, and oscillators are presented.<>
{"title":"Digital enhancement of microwave component performance","authors":"H. Endler, A. Madni, P. Vuong","doi":"10.1109/AERO.1988.38660","DOIUrl":"https://doi.org/10.1109/AERO.1988.38660","url":null,"abstract":"The authors review several areas in which microwave components and/or systems have been integrated with digital electronics to provide enhanced performance of the microwave hardware or functions which were previously unattainable. Several areas in which this combined microwave/digital technology is already being used or in which usage is proposed are discussed. Particular attention is given to the application of this combined technology to high-speed logic, measurement equipment, electronic countermeasures, computer-aided design, radars and adaptive systems, digital radio, and automated production testing. In addition, specific applications of digital enhancement to microwave attenuation, a phase shifter, and oscillators are presented.<<ETX>>","PeriodicalId":260452,"journal":{"name":"IEEE Digest on Aerospace Applications Conference","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121982460","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}
The authors report the results of a study of present and planned microelectronic products intended for the aerospace industry. Major US and Japanese electronics manufacturers were contacted and in-depth interviews were conducted with key personnel from each firm included in the study. A study of the Japanese firms was done in Japan over a three month period during the second half of 1987. A question in the study of primary concern to aerospace engineers is of how the rapidly changing electronic industry is approaching their needs. Emphasis in the study was on advanced microelectronic products. Attention was focused on high-reliability and extended-temperature-range parts, as well as full military specification and radiation-hardened parts. The results indicate that a great deal of work is being done by both US and Japanese microelectronic firms to meet the needs of the aerospace industry.<>
{"title":"Advanced microelectronic products for the aerospace industry","authors":"E. Jackson, A. Jackson","doi":"10.1109/AERO.1988.38675","DOIUrl":"https://doi.org/10.1109/AERO.1988.38675","url":null,"abstract":"The authors report the results of a study of present and planned microelectronic products intended for the aerospace industry. Major US and Japanese electronics manufacturers were contacted and in-depth interviews were conducted with key personnel from each firm included in the study. A study of the Japanese firms was done in Japan over a three month period during the second half of 1987. A question in the study of primary concern to aerospace engineers is of how the rapidly changing electronic industry is approaching their needs. Emphasis in the study was on advanced microelectronic products. Attention was focused on high-reliability and extended-temperature-range parts, as well as full military specification and radiation-hardened parts. The results indicate that a great deal of work is being done by both US and Japanese microelectronic firms to meet the needs of the aerospace industry.<<ETX>>","PeriodicalId":260452,"journal":{"name":"IEEE Digest on Aerospace Applications Conference","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132113927","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}
A MIL-STD-1750A development environment has been developed. This environment addresses the needs of real-time software development and hardware integration. A set of compatible tools executing on a general-purpose computer, with interfaces to target hardware, will remove many problems and annoyances associated with embedded real-time systems development. With all software tools hosted on VAX/VMS computers, the user is not forced to learn different operating systems, to transfer load modules from one medium to another, or to have poorly matched tools talk to one another. The user can symbolically debug his work and manipulate the MIL-STD-1750A computer, whether actual or simulated, with a powerful command language. With a nonintrusive monitor, code can be executed in real-time without the need for target-resident debug software and hardware.<>
{"title":"An integrated hardware/software development environment for MIL-STD-1750A real-time applications","authors":"L.M. Tiberia","doi":"10.1109/AERO.1988.38667","DOIUrl":"https://doi.org/10.1109/AERO.1988.38667","url":null,"abstract":"A MIL-STD-1750A development environment has been developed. This environment addresses the needs of real-time software development and hardware integration. A set of compatible tools executing on a general-purpose computer, with interfaces to target hardware, will remove many problems and annoyances associated with embedded real-time systems development. With all software tools hosted on VAX/VMS computers, the user is not forced to learn different operating systems, to transfer load modules from one medium to another, or to have poorly matched tools talk to one another. The user can symbolically debug his work and manipulate the MIL-STD-1750A computer, whether actual or simulated, with a powerful command language. With a nonintrusive monitor, code can be executed in real-time without the need for target-resident debug software and hardware.<<ETX>>","PeriodicalId":260452,"journal":{"name":"IEEE Digest on Aerospace Applications Conference","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114897224","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}
A generic application for nonvolatile mass memory on the order of 2 Gb is discussed for space applications. This system would be large enough to store satellite data for readout to the ground over readout sites. The memory should be block-addressable, so it can be used as a magnetic disk replacement. It is concluded that only 4-Mb magnetic bubble memories are currently able to replace spaceborne magnetic tape recorders for gigabit-size memories, with no penalty in size and only 50% higher weight. Since bubble memories have longer inherent life than tape recorders, additional size and weight savings could result. As far as EEPROMs (electronically erasable programmable read-only memories) are concerned, a lightweight, 2-Gb memory will have to await development of wafer-scale integration. Otherwise, the 2000 to 16000 separate chips required to supply two gigabits of storage require excessive complexity of fabrication and wiring.<>
{"title":"A comparison of nonvolatile memory technologies for spacecraft applications","authors":"P. J. Stoll","doi":"10.1109/AERO.1988.38666","DOIUrl":"https://doi.org/10.1109/AERO.1988.38666","url":null,"abstract":"A generic application for nonvolatile mass memory on the order of 2 Gb is discussed for space applications. This system would be large enough to store satellite data for readout to the ground over readout sites. The memory should be block-addressable, so it can be used as a magnetic disk replacement. It is concluded that only 4-Mb magnetic bubble memories are currently able to replace spaceborne magnetic tape recorders for gigabit-size memories, with no penalty in size and only 50% higher weight. Since bubble memories have longer inherent life than tape recorders, additional size and weight savings could result. As far as EEPROMs (electronically erasable programmable read-only memories) are concerned, a lightweight, 2-Gb memory will have to await development of wafer-scale integration. Otherwise, the 2000 to 16000 separate chips required to supply two gigabits of storage require excessive complexity of fabrication and wiring.<<ETX>>","PeriodicalId":260452,"journal":{"name":"IEEE Digest on Aerospace Applications Conference","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116968480","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}
The author explores the application of RISC (reduced instruction set computer) processors in massively parallel computer (MPC) designs for aerospace simulation. The MPC approach is shown to be well adapted to the needs of aerospace simulation. It is shown that any of the three common types of interconnection schemes used with MPCs are effective for general-purpose simulation, although the bus- or switch-oriented machines are somewhat easier to use. For partial differential equation models, the hypercube approach at first glance appears more efficient because the nearest-neighbor connections required for three-dimensional models are hardwired in a hypercube machine. However, the data broadcast ability of a bus system, combined with the fact that data can be transmitted over a bus as soon as it has been updated, makes the bus approach very competitive with the hypercube approach even for these types of models.<>
{"title":"RISC-type microprocessors may revolutionize aerospace simulation","authors":"A. Jackson","doi":"10.1109/AERO.1988.38663","DOIUrl":"https://doi.org/10.1109/AERO.1988.38663","url":null,"abstract":"The author explores the application of RISC (reduced instruction set computer) processors in massively parallel computer (MPC) designs for aerospace simulation. The MPC approach is shown to be well adapted to the needs of aerospace simulation. It is shown that any of the three common types of interconnection schemes used with MPCs are effective for general-purpose simulation, although the bus- or switch-oriented machines are somewhat easier to use. For partial differential equation models, the hypercube approach at first glance appears more efficient because the nearest-neighbor connections required for three-dimensional models are hardwired in a hypercube machine. However, the data broadcast ability of a bus system, combined with the fact that data can be transmitted over a bus as soon as it has been updated, makes the bus approach very competitive with the hypercube approach even for these types of models.<<ETX>>","PeriodicalId":260452,"journal":{"name":"IEEE Digest on Aerospace Applications Conference","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126116377","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}
The superconducting phenomenon is briefly explained. The historical background to superconductivity research is presented, and the discovery of high-temperature superconductors is described. Possible application of superconductors in the aerospace field is discussed. Problems connected with the use of superconductors are briefly discussed, with emphasis on failures at the interconnect point.<>
{"title":"Impact of high-temperature superconductors in aerospace applications","authors":"D. Reudink","doi":"10.1109/AERO.1988.38671","DOIUrl":"https://doi.org/10.1109/AERO.1988.38671","url":null,"abstract":"The superconducting phenomenon is briefly explained. The historical background to superconductivity research is presented, and the discovery of high-temperature superconductors is described. Possible application of superconductors in the aerospace field is discussed. Problems connected with the use of superconductors are briefly discussed, with emphasis on failures at the interconnect point.<<ETX>>","PeriodicalId":260452,"journal":{"name":"IEEE Digest on Aerospace Applications Conference","volume":"490 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132407394","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}
An L-band space communications tube (8537H) has been developed that provides 80 to 100 W power with about 60% efficiency, while maintaining excellent phase-linearity characteristics. At saturation the differential phase shift is 35 degrees , while the AM/PM (amplitude modulation/pulse modulation) conversion factor is 3.5 degrees /dB at the 80-W power level. The third-order intermodulation distortion provides a C/I (carrier/intermodulation) value of 23 dB at 7-dB output power backoff level. The tube is relatively small in size and weight, with a tube length of 23.6 in, and a weight of only 5.75 lb. (2.6 kg). The tube has a very long life expectancy, estimated to 120000 hours (14 y).<>
{"title":"A high efficiency traveling-wave tube for L-band aeronautical, maritime, and mobile satellite communication systems","authors":"O. Sauseng, J. M. Johnston, C.M. Leigh","doi":"10.1109/AERO.1988.38662","DOIUrl":"https://doi.org/10.1109/AERO.1988.38662","url":null,"abstract":"An L-band space communications tube (8537H) has been developed that provides 80 to 100 W power with about 60% efficiency, while maintaining excellent phase-linearity characteristics. At saturation the differential phase shift is 35 degrees , while the AM/PM (amplitude modulation/pulse modulation) conversion factor is 3.5 degrees /dB at the 80-W power level. The third-order intermodulation distortion provides a C/I (carrier/intermodulation) value of 23 dB at 7-dB output power backoff level. The tube is relatively small in size and weight, with a tube length of 23.6 in, and a weight of only 5.75 lb. (2.6 kg). The tube has a very long life expectancy, estimated to 120000 hours (14 y).<<ETX>>","PeriodicalId":260452,"journal":{"name":"IEEE Digest on Aerospace Applications Conference","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128042043","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}
The authors examine a variety of novel techniques for assessing the stability robustness of linear multivariable feedback control systems. The conservatism of various robustness tests is discussed. A nonconservative measure of robustness called the structured singular value test is introduced. An interconnected structure that applies to real and complex stability tests is demonstrated. Some remarks are made concerning the computability of various tests. It is concluded that structured singular values are less conservative than singular values, but are still conservative when compared to algorithms that attempt to compute an exact stability margin for a combination of parameter variations.<>
{"title":"A structured singular value approach to missile autopilot analysis","authors":"G. Hewer, R. Klabunde, C. Kenney","doi":"10.1109/AERO.1988.38673","DOIUrl":"https://doi.org/10.1109/AERO.1988.38673","url":null,"abstract":"The authors examine a variety of novel techniques for assessing the stability robustness of linear multivariable feedback control systems. The conservatism of various robustness tests is discussed. A nonconservative measure of robustness called the structured singular value test is introduced. An interconnected structure that applies to real and complex stability tests is demonstrated. Some remarks are made concerning the computability of various tests. It is concluded that structured singular values are less conservative than singular values, but are still conservative when compared to algorithms that attempt to compute an exact stability margin for a combination of parameter variations.<<ETX>>","PeriodicalId":260452,"journal":{"name":"IEEE Digest on Aerospace Applications Conference","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115122234","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}
The applicability of a parallel computing architecture to the solution of a large-scale moment-method code is investigated. Specifically, the NEC (Numerical Electromagnetics Code) method-of-moments scattering program is implemented on a hypercube parallel processor. The accuracy and the increase in the speed of execution on this parallel architecture are demonstrated. The results show a very large reduction in execution time for large problems. The great potential of this parallel processor is shown for interactive solution of large NEC problems as well as other moment-method techniques such as the finite-element method.<>
{"title":"Application of the hypercube parallel processor to a large-scale moment method code","authors":"F. Manshadi, P. Liewer, J. Patterson","doi":"10.1109/AERO.1988.38668","DOIUrl":"https://doi.org/10.1109/AERO.1988.38668","url":null,"abstract":"The applicability of a parallel computing architecture to the solution of a large-scale moment-method code is investigated. Specifically, the NEC (Numerical Electromagnetics Code) method-of-moments scattering program is implemented on a hypercube parallel processor. The accuracy and the increase in the speed of execution on this parallel architecture are demonstrated. The results show a very large reduction in execution time for large problems. The great potential of this parallel processor is shown for interactive solution of large NEC problems as well as other moment-method techniques such as the finite-element method.<<ETX>>","PeriodicalId":260452,"journal":{"name":"IEEE Digest on Aerospace Applications Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133653202","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：