随着汽车智能化、网联化、共享化、电动化的发展,汽车软件迭代频繁且车内通信数据激增,传统总线无法满足需求,需引入以太网通信。远程在线升级(Over the Air,OTA)需告知用户升级内容,涉及大量数据传输,故采用基于以太网的IP面向服务可...随着汽车智能化、网联化、共享化、电动化的发展,汽车软件迭代频繁且车内通信数据激增,传统总线无法满足需求,需引入以太网通信。远程在线升级(Over the Air,OTA)需告知用户升级内容,涉及大量数据传输,故采用基于以太网的IP面向服务可扩展通信协议(SOME/IP)。本文结合OTA升级功能,介绍基于SOME/IP协议的开发流程与方法,为车载以太网网络开发提供指导。展开更多
随着汽车“新四化”的发展,汽车软件更新迭代频繁,传统的离线升级功能已无法满足用户及车企需求,因此需要开发汽车远程空中下载(Over the air,OTA)升级功能。通过OTA升级,车企可实时向车辆推送新功能,持续优化用户的产品体验。然而,OTA...随着汽车“新四化”的发展,汽车软件更新迭代频繁,传统的离线升级功能已无法满足用户及车企需求,因此需要开发汽车远程空中下载(Over the air,OTA)升级功能。通过OTA升级,车企可实时向车辆推送新功能,持续优化用户的产品体验。然而,OTA升级过程涉及车端、云端、通信链路多环节的数据交互,使车辆面临网络攻击的风险。本文从升级包安全、车云链路安全、车端安全存储及安全监测与应急响应四个维度,系统介绍商用汽车OTA功能开发中的信息安全应对方案,为商用汽车OTA安全落地提供技术参考。展开更多
For 5G millimeter wave(mm-Wave)user equipments(UEs),all test cases must be evaluated in Over-The-Air(OTA)manner.Test time increases dramatically compared to Sub-6 GHz.Therefore,test time reduction is of great signific...For 5G millimeter wave(mm-Wave)user equipments(UEs),all test cases must be evaluated in Over-The-Air(OTA)manner.Test time increases dramatically compared to Sub-6 GHz.Therefore,test time reduction is of great significance for 5G mm-Wave OTA testing.Among all test cases,beam peak search is the most time-consuming,taking up the majority of the overall test time.Therefore,the objective of this work is to determine a suitable beam peak search grid for 5G mm-Wave UEs with satisfactory accuracy and efficiency.Through radiation property investigation of 5G mm-Wave commercial UEs,more reasonable reference array configuration(4×2)and reference deployment scenario(composite beam)are proposed for beam peak search grid analysis.The effect of different grid configurations on beam peak search precision are characterized quantitatively.The determination of associated measurement uncertainty(MU)term along with quantitative analysis approach are proposed based on statistical analysis.Finally,the recommended minimum number of beam peak search grid points is 182 based on the proposed 4×2 array under composite beam scenario.Compared with currently-required 1106 points in 3GPP/CTIA specifications,over 80%reduction can be achieved without increasing the MU limit.The feasibility of the proposed MU analysis as well as the recommended grids is demonstrated through measurements.展开更多
This paper introduces a mixed-mode biquad employing OTAs （operational trans-conductance amplifiers） and grounded capacitors. The circuit can perform mixed-mode operation by selecting the input and output terminals. ...This paper introduces a mixed-mode biquad employing OTAs （operational trans-conductance amplifiers） and grounded capacitors. The circuit can perform mixed-mode operation by selecting the input and output terminals. Additionally, the circuit enables low-pass, band-pass, high-pass, band-stop and all-pass transfer functions suitably choosing the input terminals. The circuit parameters ω0 and Q can be tuned orthogonally through adjusting the trans-conductance gains of the OTAs. The biquad enjoys very low sensitivities with respect to the circuit active and passive components. The achievement examples are given together with simulation results by PSPICE.展开更多
A novel current mode active-only universal filter using four dual current output Operational Transconductance Amplifiers (OTAs) and three Operational Amplifiers (OAs) is presented. The circuit can realize low pass and...A novel current mode active-only universal filter using four dual current output Operational Transconductance Amplifiers (OTAs) and three Operational Amplifiers (OAs) is presented. The circuit can realize low pass and high pass filter characteristics by choosing the suitable current output branches. The filter performance factors natural frequency (ω0), bandwidth , quality factor Q and transconductance gain gm are electronically tunable. The proposed circuit has very low sensitivities with respect to circuit active elements. From sensitivity analysis, it has been clearly shown that the proposed circuit has very low sensitivities with respect to the circuit active elements. The gain roll-off of high pass and low pass configuration is 18 dB/oc- tave. The proposed circuit facilitates integrability, programmability and ease of implementation.展开更多
随着汽车电子化、智能化发展,电子电气架构向计算中央化、数据和能源区域化演进,车载计算平台的集中化使相关需求指数级提升。智能中央计算平台作为汽车电子架构核心,其刷写技术对提升汽车性能、优化用户体验意义重大。本文探讨该平台...随着汽车电子化、智能化发展,电子电气架构向计算中央化、数据和能源区域化演进,车载计算平台的集中化使相关需求指数级提升。智能中央计算平台作为汽车电子架构核心,其刷写技术对提升汽车性能、优化用户体验意义重大。本文探讨该平台软件刷写总体方案,深入研究基于互联网的诊断协议(Diagnostics over Internet Protocol,DoIP)升级、空中下载技术主控制器、智能部件刷写等关键技术。结果表明,其具备高性能处理、低延迟跨核通信等优势,能有效提升汽车模块更新效率,可为汽车智能化发展提供技术支撑。展开更多
文摘随着汽车智能化、网联化、共享化、电动化的发展,汽车软件迭代频繁且车内通信数据激增,传统总线无法满足需求,需引入以太网通信。远程在线升级(Over the Air,OTA)需告知用户升级内容,涉及大量数据传输,故采用基于以太网的IP面向服务可扩展通信协议(SOME/IP)。本文结合OTA升级功能,介绍基于SOME/IP协议的开发流程与方法,为车载以太网网络开发提供指导。
文摘随着汽车“新四化”的发展,汽车软件更新迭代频繁,传统的离线升级功能已无法满足用户及车企需求,因此需要开发汽车远程空中下载(Over the air,OTA)升级功能。通过OTA升级,车企可实时向车辆推送新功能,持续优化用户的产品体验。然而,OTA升级过程涉及车端、云端、通信链路多环节的数据交互,使车辆面临网络攻击的风险。本文从升级包安全、车云链路安全、车端安全存储及安全监测与应急响应四个维度,系统介绍商用汽车OTA功能开发中的信息安全应对方案,为商用汽车OTA安全落地提供技术参考。
基金supported by the Beijing Natural Science Foundation under Grant L253002.
文摘For 5G millimeter wave(mm-Wave)user equipments(UEs),all test cases must be evaluated in Over-The-Air(OTA)manner.Test time increases dramatically compared to Sub-6 GHz.Therefore,test time reduction is of great significance for 5G mm-Wave OTA testing.Among all test cases,beam peak search is the most time-consuming,taking up the majority of the overall test time.Therefore,the objective of this work is to determine a suitable beam peak search grid for 5G mm-Wave UEs with satisfactory accuracy and efficiency.Through radiation property investigation of 5G mm-Wave commercial UEs,more reasonable reference array configuration(4×2)and reference deployment scenario(composite beam)are proposed for beam peak search grid analysis.The effect of different grid configurations on beam peak search precision are characterized quantitatively.The determination of associated measurement uncertainty(MU)term along with quantitative analysis approach are proposed based on statistical analysis.Finally,the recommended minimum number of beam peak search grid points is 182 based on the proposed 4×2 array under composite beam scenario.Compared with currently-required 1106 points in 3GPP/CTIA specifications,over 80%reduction can be achieved without increasing the MU limit.The feasibility of the proposed MU analysis as well as the recommended grids is demonstrated through measurements.
文摘This paper introduces a mixed-mode biquad employing OTAs （operational trans-conductance amplifiers） and grounded capacitors. The circuit can perform mixed-mode operation by selecting the input and output terminals. Additionally, the circuit enables low-pass, band-pass, high-pass, band-stop and all-pass transfer functions suitably choosing the input terminals. The circuit parameters ω0 and Q can be tuned orthogonally through adjusting the trans-conductance gains of the OTAs. The biquad enjoys very low sensitivities with respect to the circuit active and passive components. The achievement examples are given together with simulation results by PSPICE.
文摘A novel current mode active-only universal filter using four dual current output Operational Transconductance Amplifiers (OTAs) and three Operational Amplifiers (OAs) is presented. The circuit can realize low pass and high pass filter characteristics by choosing the suitable current output branches. The filter performance factors natural frequency (ω0), bandwidth , quality factor Q and transconductance gain gm are electronically tunable. The proposed circuit has very low sensitivities with respect to circuit active elements. From sensitivity analysis, it has been clearly shown that the proposed circuit has very low sensitivities with respect to the circuit active elements. The gain roll-off of high pass and low pass configuration is 18 dB/oc- tave. The proposed circuit facilitates integrability, programmability and ease of implementation.
文摘随着汽车电子化、智能化发展,电子电气架构向计算中央化、数据和能源区域化演进,车载计算平台的集中化使相关需求指数级提升。智能中央计算平台作为汽车电子架构核心,其刷写技术对提升汽车性能、优化用户体验意义重大。本文探讨该平台软件刷写总体方案,深入研究基于互联网的诊断协议(Diagnostics over Internet Protocol,DoIP)升级、空中下载技术主控制器、智能部件刷写等关键技术。结果表明,其具备高性能处理、低延迟跨核通信等优势,能有效提升汽车模块更新效率,可为汽车智能化发展提供技术支撑。
