27th IEEE Vehicular Technology Conference最新文献_第3页

Radiated noise due to individual spark events in an internal combustion engine 内燃机中单个火花事件引起的辐射噪声

27th IEEE Vehicular Technology Conference Pub Date : 1977-03-16 DOI: 10.1109/VTC.1977.1622421

W. Johnson, H.A. Piper, J.E. Amay

{"title":"Radiated noise due to individual spark events in an internal combustion engine","authors":"W. Johnson, H.A. Piper, J.E. Amay","doi":"10.1109/VTC.1977.1622421","DOIUrl":"https://doi.org/10.1109/VTC.1977.1622421","url":null,"abstract":"Due to increasing concern about emissions from internal combustion engines that cause radio frequency interference (RFI), investigations are being made to identify sources of the interference and into possible methods of remedying them. In the investigations, it is useful to have a system by which a correlation can be made between the time at which a particular event in the ignition sequence occurs and the RFI produced at that time. See. Fig. 1 for a definition of the ignition events. A system is described in the paper which permits this correlation by obtaining synchronization signals from the engine's ignition system. The synchronization signals are used to view the video output of an RFI receiver or spectrum analyzer as a function of time on an oscilloscope. This allows for discrimination of the ignition related RFI to a time resolution determined by the bandwidth of the receiver being used. A particular advantage of this technique is that it permits a more accurate assessment of the effect of individual component modification in a complex system and, in addition, it permits discrimination against RFI sources unrelated to the automobile being tested.","PeriodicalId":105804,"journal":{"name":"27th IEEE Vehicular Technology Conference","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134463559","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}

引用次数: 3

Personal radio planning at the federal communications commission 联邦通信委员会的个人无线电规划

27th IEEE Vehicular Technology Conference Pub Date : 1977-03-16 DOI: 10.1109/VTC.1977.1622416

R. Stone

引用次数: 0

Vehicular communications 2500 feet underground 车辆通讯在地下2500英尺

27th IEEE Vehicular Technology Conference Pub Date : 1977-03-16 DOI: 10.1109/VTC.1977.1622436

R. Chufo

引用次数: 3

Automatic vehicle location Dallas test results 自动车辆定位达拉斯测试结果

27th IEEE Vehicular Technology Conference Pub Date : 1977-03-16 DOI: 10.1109/VTC.1977.1622434

A. Riccio

{"title":"Automatic vehicle location Dallas test results","authors":"A. Riccio","doi":"10.1109/VTC.1977.1622434","DOIUrl":"https://doi.org/10.1109/VTC.1977.1622434","url":null,"abstract":"The FCC allocation of a wide band channel at 900 MHz for an Automatic Vehicle Monitoring (AVM) service presented the opportunity to Hazeltine to develop a vehicle locating system that can support 5,000 vehicles with high location accuracy information and rapid two-way data message transmissions. The system is configured to have variable up-date rate of information dependent on user requirements while providing a moving vehicle location accuracy of 300 feet (95% confidence). The basic system utilizes pulse trilateration with an automatic computer inverse hyperbolic location solution-The vehicles are polled sequentially and reply to multiple fixed receivers. Time difference of arrival data is collected and processed automatically. The solution of the intersection of hyperbolic lines via a Newton-Raphson iteration method is utilized in the computer location process. The receiver sites are configured in a triangular cell pattern lending the system to graceful growth capability. Test results obtained in the Phase I program performed for the City of Dallas have demonstrated the accuracy and general feasibility of the location technique in the Dallas Police Departments Southwest Patrol District. A single interrogation locating performance of 270 feet for 95% of the locations and 60 feet for 50% of the locations has been documented. Better than 90% of the randomly distributed vehicle positions were successfully located within the accuracy distribution limits. Moving vehicle plots showing the reported vehicle positions in relation to the traversed roads gives a pictorial presentation of the frequency of error vs. magnitude of error of the histogram plots.","PeriodicalId":105804,"journal":{"name":"27th IEEE Vehicular Technology Conference","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128244489","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}

引用次数: 1

Mospower: Will it be the universal replacement for high-frequency power bipolars? Mospower:它会成为高频功率双极的普遍替代品吗?

27th IEEE Vehicular Technology Conference Pub Date : 1977-03-16 DOI: 10.1109/VTC.1977.1622441

E. Oxner

引用次数: 0

Mobile radio performance for a 2-branch equal-gain combining receiver with correlated signals at the land site 陆基2支路等增益组合接收机与相关信号的移动无线电性能

27th IEEE Vehicular Technology Conference Pub Date : 1977-03-16 DOI: 10.1109/VTC.1977.1622442

W.C.-Y. Lee

{"title":"Mobile radio performance for a 2-branch equal-gain combining receiver with correlated signals at the land site","authors":"W.C.-Y. Lee","doi":"10.1109/VTC.1977.1622442","DOIUrl":"https://doi.org/10.1109/VTC.1977.1622442","url":null,"abstract":"It has generally been accepted that in a two-branch diversity receiver a near maximum diversity advantage is realized when the cross-correlation between the two branches is less than 0.7. Based on this figure, space diversity reception at the mobile presents little problem since the antenna separation distances that achieve this amount of decorrelation in the mobile environment are very small (≤20 centimeter at 850 MHz). However, the space diversity antenna separation requirement at the land site necessary to achieve the same amount of signal decorrelation is in the range of 10 wave-lengths or more at antenna elevations of 150 feet or greater. Therefore, a comprehensive characterization of the effect of changing the cross-correlation between the two received signals at the land site is important to effective system design. This paper describes the performance of the two-branch equal-gain diversity system as a function of the cross-correlation between the two received signals from the diversity antennas. The cumulative probability distributions, level crossing rates and duration of fades from a two-branch equal-gain combined diversity signal with variable correlation between the two branches are described.","PeriodicalId":105804,"journal":{"name":"27th IEEE Vehicular Technology Conference","volume":"148 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133829882","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}

引用次数: 0

Integrated circuits for mobile radio 移动无线电用集成电路

27th IEEE Vehicular Technology Conference Pub Date : 1977-03-16 DOI: 10.1109/VTC.1977.1622439

J. M. Bryant

引用次数: 0

Television interference associated with the proposed class E 220 MHz Citizens Radio Service 与拟议的E级220兆赫公民无线电服务相关的电视干扰

27th IEEE Vehicular Technology Conference Pub Date : 1977-03-16 DOI: 10.1109/VTC.1977.1622419

R. Brandel

引用次数: 1

Energy deposition in biological tissue near portable radio transmitters at VHF and UHF 甚高频和超高频便携式无线电发射机附近生物组织中的能量沉积

27th IEEE Vehicular Technology Conference Pub Date : 1977-03-16 DOI: 10.1109/VTC.1977.1622417

Q. Balzano, O. Garay, R. Steel

引用次数: 10

An interference free multi-vehicular repeater system 一种无干扰多车中继器系统

27th IEEE Vehicular Technology Conference Pub Date : 1977-03-16 DOI: 10.1109/VTC.1977.1622447

L. Bennett, T. Faulkner

引用次数: 0