The 771 microprocessor is used as the main control processor for the Mast Mounted Sight (MMS) on the Bell Helicopter OH-58A helicopter for the US Army Advanced Helicopter Improvement Programme (AHIP). The 771 and its test set/development system were designed in January 1977. These 10-year-old designs currently have a wide range of problems in production, test, and software development. To increase system performance, lower manufacturing costs, and improve software development efforts, an upgraded 771 processor and development system has been developed. The new processor, the 771C, is implemented using ASIC (application-specific integrated circuit) and VLSI technology. The 771C increases memory and I/O capability, reduces board and part counts, and increases throughput by up to 73%. The author describes the 771C and its development system implementation performed at McDonnell Douglas Astronautics Company, Huntington Beach, California.<>
{"title":"The mast mounted sight 771 processor upgrade program","authors":"L.M. Tiberia","doi":"10.1109/AERO.1989.82410","DOIUrl":"https://doi.org/10.1109/AERO.1989.82410","url":null,"abstract":"The 771 microprocessor is used as the main control processor for the Mast Mounted Sight (MMS) on the Bell Helicopter OH-58A helicopter for the US Army Advanced Helicopter Improvement Programme (AHIP). The 771 and its test set/development system were designed in January 1977. These 10-year-old designs currently have a wide range of problems in production, test, and software development. To increase system performance, lower manufacturing costs, and improve software development efforts, an upgraded 771 processor and development system has been developed. The new processor, the 771C, is implemented using ASIC (application-specific integrated circuit) and VLSI technology. The 771C increases memory and I/O capability, reduces board and part counts, and increases throughput by up to 73%. The author describes the 771C and its development system implementation performed at McDonnell Douglas Astronautics Company, Huntington Beach, California.<<ETX>>","PeriodicalId":414116,"journal":{"name":"IEEE Aerospace Applications Conference","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122646721","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 describe a breadboard radar system that is being designed and tested at the Johnson Space Center for dealing with the space debris problem that could present a growing threat to the planned Space Station Freedom. The major problems that the design of such a system faces are due to the small radar cross section (RCS) of such debris (below -30 dBm/sup 2/), the high closing velocities of the particles with respect to the space station (10 km/sec and higher), and the stringent constraints imposed on its implementation as a spaceborne system. These constraints include weight, prime power consumption, maintenance, and reliability. The authors discuss the preliminary implementation of a ground demonstration radar for testing concepts, technologies, and performance envelopes that will eventually carry over to the space-borne debris detection and tracking radar. Simulation results and techniques developed for predicting system performances and for evaluating antenna parameters are given. The design process of the electronically steered phased array antenna is briefly described and block diagrams for the implementation of the radar system are given.<>
{"title":"Design of an orbital debris radar ground demonstration","authors":"I. Paz, J. R. Carl, R. Shaw, J. Kovitz, G. Arndt","doi":"10.1109/AERO.1989.82427","DOIUrl":"https://doi.org/10.1109/AERO.1989.82427","url":null,"abstract":"The authors describe a breadboard radar system that is being designed and tested at the Johnson Space Center for dealing with the space debris problem that could present a growing threat to the planned Space Station Freedom. The major problems that the design of such a system faces are due to the small radar cross section (RCS) of such debris (below -30 dBm/sup 2/), the high closing velocities of the particles with respect to the space station (10 km/sec and higher), and the stringent constraints imposed on its implementation as a spaceborne system. These constraints include weight, prime power consumption, maintenance, and reliability. The authors discuss the preliminary implementation of a ground demonstration radar for testing concepts, technologies, and performance envelopes that will eventually carry over to the space-borne debris detection and tracking radar. Simulation results and techniques developed for predicting system performances and for evaluating antenna parameters are given. The design process of the electronically steered phased array antenna is briefly described and block diagrams for the implementation of the radar system are given.<<ETX>>","PeriodicalId":414116,"journal":{"name":"IEEE 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":"123741172","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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