This paper presents embedded system design of the In-Vehicle System (IVS) for the European Union (EU) emergency call (eCall) system. The IVS transmitter modules are designed, developed and implemented on a field progr...This paper presents embedded system design of the In-Vehicle System (IVS) for the European Union (EU) emergency call (eCall) system. The IVS transmitter modules are designed, developed and implemented on a field programmable gate array (FPGA) device. The modules are simulated, synthesized, and optimized to be loaded on a reconfigurable device as a system-on-chip (SoC) for the IVS electronic device. All the modules of the transmitter are designed as a single embedded module. The bench-top test is completed for testing and verification of the developed modules. The hardware architecture and interfaces are discussed. The IVS signal processing time is analyzed for multiple frequencies. A range of appropriate frequency and two hardware interfaces are proposed. A state-of-the-art FPGA design is employed as a first implementation approach for the IVS prototyping platform. This work is used as an initial step to implement all the modules of the IVS on a single SoC chip.展开更多
eCall是欧盟计划在2015年完成部署的一套车载自动紧急呼叫系统,在发生严重交通事故后,即使司机和乘客失去知觉不能拨打电话,这一系统也能够自动拨叫欧洲统一的紧急救援电话112,并报告事故车辆所处的位置。罗德与施瓦茨公司的R&S?CMW...eCall是欧盟计划在2015年完成部署的一套车载自动紧急呼叫系统,在发生严重交通事故后,即使司机和乘客失去知觉不能拨打电话,这一系统也能够自动拨叫欧洲统一的紧急救援电话112,并报告事故车辆所处的位置。罗德与施瓦茨公司的R&S?CMW500和R&S?SMBV100A仪表,配合R&S?CMWKA094 e Call应用软件,为客户提供了一套理想的e Call车载系统可靠性测试方案。展开更多
The change of hit record set affects re call ratio and pertinency ratio greatly in the computer information retrieval.In this paper,the regularity of hit record set in the computer information retriev al is studied in...The change of hit record set affects re call ratio and pertinency ratio greatly in the computer information retrieval.In this paper,the regularity of hit record set in the computer information retriev al is studied in theory and in practice.It’s found both in the specific retriev al examples that the hit record set may remain unchanged,decrease,increase or be the combination of them with the increase or decrease of the retrieval facets in queries.It provides an essential basis for the research on the relations betwee n recall ratio and pertinency ratio.展开更多
文摘This paper presents embedded system design of the In-Vehicle System (IVS) for the European Union (EU) emergency call (eCall) system. The IVS transmitter modules are designed, developed and implemented on a field programmable gate array (FPGA) device. The modules are simulated, synthesized, and optimized to be loaded on a reconfigurable device as a system-on-chip (SoC) for the IVS electronic device. All the modules of the transmitter are designed as a single embedded module. The bench-top test is completed for testing and verification of the developed modules. The hardware architecture and interfaces are discussed. The IVS signal processing time is analyzed for multiple frequencies. A range of appropriate frequency and two hardware interfaces are proposed. A state-of-the-art FPGA design is employed as a first implementation approach for the IVS prototyping platform. This work is used as an initial step to implement all the modules of the IVS on a single SoC chip.
文摘eCall是欧盟计划在2015年完成部署的一套车载自动紧急呼叫系统,在发生严重交通事故后,即使司机和乘客失去知觉不能拨打电话,这一系统也能够自动拨叫欧洲统一的紧急救援电话112,并报告事故车辆所处的位置。罗德与施瓦茨公司的R&S?CMW500和R&S?SMBV100A仪表,配合R&S?CMWKA094 e Call应用软件,为客户提供了一套理想的e Call车载系统可靠性测试方案。
文摘The change of hit record set affects re call ratio and pertinency ratio greatly in the computer information retrieval.In this paper,the regularity of hit record set in the computer information retriev al is studied in theory and in practice.It’s found both in the specific retriev al examples that the hit record set may remain unchanged,decrease,increase or be the combination of them with the increase or decrease of the retrieval facets in queries.It provides an essential basis for the research on the relations betwee n recall ratio and pertinency ratio.
