1980 IEEE International Symposium on Electromagnetic Compatibility最新文献

{"title":"Remote Identification of Salt Water Wedges Using a Monocycle Radar","authors":"C. Bertram","doi":"10.1109/ISEMC.1980.7567313","DOIUrl":"https://doi.org/10.1109/ISEMC.1980.7567313","url":null,"abstract":"This study, funded by ONR on contract N00014-79-C-0160, investigates the characteris­ tics of a single sinusoidal variation or single square pulse of electromagnetic energy called a monocycle pulse. The study shows that the dispersion of the monocycle pulse is character­ ized by the materials from which it is reflected. The implication is that it is possible to detect and identify a salt water under dissipative fresh water by examining the reflected monocycle pulse. INTRODUCTION A monocycle pulse is either half or one full cycle of a harmonic wave or square wave. It is the limiting of the harmonic wave or square wave in time that gives it its broadband characteris­ tics. The broadband is not shifted up in fre­ quency by a carrier because the monocycle is \"carrierless\". The duration of a monocycle pulse can be microseconds, nanoseconds or picoseconds. Its harmonic analysis (Fourier transform from the time domain to the frequency domain) represents a broadband pulse that does not have a carrier. The characteristics of a single cycle of short sinusoidal or square pulse of electromag­ netic radiation are significantly different from the widely studied characteristics of single fre­ quency pulse modulated continuous electromagnetic waves. Such a monocycle pulse undergoes a dis­ persion and a change in amplitude when it is re­ flected from a boundary between media of differ­ ent electrical conductivities, capacitivities (dielectric constants) and/or specific induc­ tivities (permeabilities). The dispersion and amplitude change and consequently the resulting shape of the monocycle pulse depends on these differences in a, e and p. COMPUTER MODEL A computer model was developed to simulate a monocycle radar in air 15 meters over a layer of fresh water which is over a layer of salt water. The material the layer consists of can be changed by changing the value of dielectric constant and conductivity, the constitutive parameters of the medium. The study using the computer model shows that it is possible to deter­ mine the difference between the transmitted mono­ cycle pulse, the pulse reflected from the air/ fresh water interface and the fresh water/salt water interface by examining their shapes. (See Figure 1). The salt water layer was changed to simulate a sandy bottom and the pulse was com­ pared to one reflected from the salt water layer. The pulses differed in both amplitude and shape inplying it is possible to determine the differ­ ence between a salt water wedge and a sandy bottom by comparing the reflected pulses. (See Figure 2). The computer model modified to simulate the temperature and salinities of the West Gotland Basin showed that for a 100 ns pulse propagating through 5 meters of water with a conductivity of 1.2 mhos/meter, 28 mV/meter returned to the mono­ cycle radar antenna on the surface of the water. The model also showed that when the conduction current dominates the displacement current delays in propagation as high as a factor of 80 can","PeriodicalId":448304,"journal":{"name":"1980 IEEE International Symposium on Electromagnetic Compatibility","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1980-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122133656","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":"New and Known Methods of the Application of Transforms to Quasiperiodic Biomedical Signals","authors":"B. Meffert, D. Schubert, T. Lazarus, R. Poll, R. Henssge","doi":"10.1109/ISEMC.1980.7567314","DOIUrl":"https://doi.org/10.1109/ISEMC.1980.7567314","url":null,"abstract":"A systematization of the application of transformations for the analysis of biomedical signals is discussed. It distinguishes between the trans­ formation of the total period or the partial period and also between the categories medical-diagnostic clas­ sification and technical wave re­ cognition. This systematization shows that the complete data pro­ cessing can be accomplished in the spectral domain or that preferably only sections of it are processed by transformation.","PeriodicalId":448304,"journal":{"name":"1980 IEEE International Symposium on Electromagnetic Compatibility","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1980-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115313316","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":"On Radiated EMI Measurement in the VHF/UHF Frequency Range","authors":"R. German, R. Calcavecchio","doi":"10.1109/ISEMC.1980.7567270","DOIUrl":"https://doi.org/10.1109/ISEMC.1980.7567270","url":null,"abstract":"","PeriodicalId":448304,"journal":{"name":"1980 IEEE International Symposium on Electromagnetic Compatibility","volume":"256 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1980-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122467747","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":"Effective Grounding - The Key to Personnel Protection and Proper Equipment Operation","authors":"E. C. Cantwell","doi":"10.1109/ISEMC.1980.7567289","DOIUrl":"https://doi.org/10.1109/ISEMC.1980.7567289","url":null,"abstract":"G r o u n d i n g i s o n e o f t h e m o s t i m p o r t a n t a n d l e a s t u n d e r s t o o d a s p e c t s o f a n e l e c t r i c a l s y s t e m . T h i s p a p e r w i l l e x a m i n e t h e v a r i o u s c o m p o n e n t s o f a g r o u n d i n g s y s t e m a n d r e m o v e t h e c l o u d i n e s s a s t o w h a t i s s p e c i f i c a l l y r e q u i r e d t o a c h i e v e e f f e c t i v e ' g r o u n d i n g . T h e i m p o r t a n c e o f e f f e c t i v e g r o u n d i n g a s i t r e l a t e s t o p e r s o n n e l p r o t e c t i o n a n d p r o p e r e q u i p ­ m e n t o p e r a t i o n w i l l b e a n a l y z e d . A p r o c e d u r e t o p r o v i d e p e r s o n n e l p r o t e c t i o n u n d e r w o r s t c a s e g r o u n d f a u l t c o n d i t i o n s t h r o u g h d e t e r m i n a t i o n o f t h e m ax im um a l l o w a b l e i m p e d a n c e f o r t h e e q u i p m e n t g r o u n d i n g c o n d u c t o r i s e s t a b ­ l i s h e d . F i n a l l y , a r e c o m m e n d e d m e t h o d o f t e s t i n g a n d e v a l u a t i o n o f t h e i m p e d a n c e o f e q u i p m e n t g r o u n d s i s g i v e n . INTRODUCTION T o c l e a r l y u n d e r s t a n d t h e p u r p o s e a n d f u n c ­ t i o n o f g r o u n d i n g e l e c t r i c a l s y s t e m s a n d e q u i p ­ m e n t , g r o u n d i n g m u s t b e s u b d i v i d e d i n t o t w o c a t ­ e g o r i e s : (1 ) E q u i p m e n t G r o u n d i n g , a n d (2 ) E a r t h G r o u n d i n g . T h e s e tw o c a t e g o r i e s a r e o f t e n i n t e r ­ c h a n g e d a n d t h e r e s u l t a n t m i s a p p l i c a t i o n o f e a r t h a n d e q u i p m e n t g r o u n d i n g p r a c t i c e s c a n l e a d t o a s y s t e m t h a t i s i n e f f i c i e n t a n d e v e n u n s a f e . T o i n s u r e m ax im um p o s s i b l e e f f i c i e n c y o f t h e s y s t e m t o p r o v i d e p r o p e r e q u i p m e n t o p e r a t i o n a s w e l l a s p e r s o n n e l a n d f i r e p r o t e c t i o n , a r e v i e w o f t h e p r u p o s e o f e a r t h g r o u n d i n g a n d e q u i p m e n t g r o u n d i n g i s g i v e n . EARTH GROUNDING T h e b a s i c p u r p o s e o f e a r t h g r o u n d i n g i s t o p r o t e c t t h e e l e c t r i c a l s y s t e m a n d e q u i p m e n t f r o m s u p e r i m p o s e d v o l t a g e s c a u s e d b y l i g h t n i n g a n d a c c i d e n t a l c o n t a c t w i t h h i g h e r v o l t a g e s y s t e m s . E a r t h g r o u n d i n g i s a l s o r e q u i r e d t o p r e v e n t t h e b u i l d u p o f s t a t i c c h a r g e s o n s y s t e m s a n d e q u i p ­ m e n t . A d e t a i l e d d i s c u s s i o n o f e a r t h g r o u n d i n g p r i n c i p l e s a n d p r a c t i c e s i s c o n t a i n e d i n R e f e r e n c e 1 . P r o p e r e a r t h g r o u n d i n g i s r e q u i r e d f o r p e r ­ s o n n e l a n d s y s t e m p r o t e c t i o n i n m e d iu m a n d h i g h v o l t a g e","PeriodicalId":448304,"journal":{"name":"1980 IEEE International Symposium on Electromagnetic Compatibility","volume":"21 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1980-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132359059","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":"RF and Microwave Emissions from a Video Display Terminal, a Color TV Receiver, and a Monochrome TV Receiver","authors":"Albert A. Smith","doi":"10.1109/ISEMC.1980.7567257","DOIUrl":"https://doi.org/10.1109/ISEMC.1980.7567257","url":null,"abstract":"Emissions from an IBM 3277 Model 2 Video Display Terminal were measured in the radio frequency and microwave regions. For comparison, the emissions from a color TV receiver and a monochrome TV receiver were also measured. Magnetic,field spectrums from 1 kHz to 30 MHz and electric field spectrums from 10 kHz to 10 GHz, measured at a distance of 25 cm from the face of the cathode ray tubes, are given. The measured emissions are compared with the ANSI and USSR exposure standards. This work was part of a comprehensive study encompassing the entire electro­ magnetic spectrum up to the X-ray region, and was prompted by concerns of potential biological damage from ionizing and non-ionizing radiation from video display terminals.","PeriodicalId":448304,"journal":{"name":"1980 IEEE International Symposium on Electromagnetic Compatibility","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1980-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127787659","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":"On the Logic Design Using Multiplexers and Spectral Techniques","authors":"A. B. Ektare, D. Mital","doi":"10.1109/ISEMC.1980.7567309","DOIUrl":"https://doi.org/10.1109/ISEMC.1980.7567309","url":null,"abstract":"","PeriodicalId":448304,"journal":{"name":"1980 IEEE International Symposium on Electromagnetic Compatibility","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1980-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133273246","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":"Computer Simulation of TV Signal Reception Under Noisy Conditions","authors":"K. Wong, O. K. Gashus, V. Aatre, D. Myer","doi":"10.1109/ISEMC.1980.7567326","DOIUrl":"https://doi.org/10.1109/ISEMC.1980.7567326","url":null,"abstract":"Computer simulations have been carried out to simulate the transmission of a colour TV signal and to investigate the reception of the signal under various types of noise at different power levels. The susceptibility of the various components of the television signal was observed and the signal to noise ratio calculated. It was found that, in general, the blue gun yields the poorest S/N ratio while the green gun yields the best. These S/N ratios have also been found to be very much dependent on the type of input noise. segments, the colour of each of which is chosen from the following — white, blue, yellow, green, red, cyan and megenta. These segments are chosen such that the three primary colours red, green and blue have equal occurrence within the period T. The following is the mathematical formulation of the transmission and reception of the TV signal.","PeriodicalId":448304,"journal":{"name":"1980 IEEE International Symposium on Electromagnetic Compatibility","volume":"222 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1980-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133352903","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":"FCC Controls Digital Equipment","authors":"A. Wall, Robert Bromery","doi":"10.1109/ISEMC.1980.7567287","DOIUrl":"https://doi.org/10.1109/ISEMC.1980.7567287","url":null,"abstract":"","PeriodicalId":448304,"journal":{"name":"1980 IEEE International Symposium on Electromagnetic Compatibility","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1980-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124170943","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":"Construction of Fast Unitary Transforms Which are Equivalent to Karhunen-Loeve Spectral Representations","authors":"E. Trachtenberg","doi":"10.1109/ISEMC.1980.7567322","DOIUrl":"https://doi.org/10.1109/ISEMC.1980.7567322","url":null,"abstract":"We consider in this paper the suboptimal usage of unitary transforms in digital sig­ nal processing subject to performance and computational constraints. Considering the cases of filtering and coding, it was sug­ gested (see [1,2,3])'to look for a compro­ mising unitary transform between the two extremes: the Karhunen-Loeve transform (KLT) which diagonalizes the covariance matrix of the input n-vector i.e. it is statistically optimal but its implementa­ tion requires of the order of n^ computer operations and the identity transform (ITthe (nxn)-identity matrix) which is compu­ tationally optimal but does not decorre­ late the covariance matrix of the input. That is, it is desirable for a given input to find a transform which is \"close\" to its KLT and does not have the KLT' s disadvan­ tages .","PeriodicalId":448304,"journal":{"name":"1980 IEEE International Symposium on Electromagnetic Compatibility","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1980-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130978755","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":"Australian Standard as 2279-1979: A Specification Setting Network Harmonics Limits","authors":"Theodore L. Baitch","doi":"10.1109/ISEMC.1980.7567286","DOIUrl":"https://doi.org/10.1109/ISEMC.1980.7567286","url":null,"abstract":"","PeriodicalId":448304,"journal":{"name":"1980 IEEE International Symposium on Electromagnetic Compatibility","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1980-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130827865","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}