针对目前控制器局域网(Controller Area Network, CAN)总线技术通信速度较慢、带宽有限以及可扩展性差等弊端,利用车载以太网技术实现车内控制器与车联网控制单元T-Box的局域网通信,以实现数据的存储和收集。在嵌入式平台STM32F429VIT6...针对目前控制器局域网(Controller Area Network, CAN)总线技术通信速度较慢、带宽有限以及可扩展性差等弊端,利用车载以太网技术实现车内控制器与车联网控制单元T-Box的局域网通信,以实现数据的存储和收集。在嵌入式平台STM32F429VIT6移植FreeRTOS操作系统和LwIP网络协议栈,通过OTA技术完成系统软件的远程升级。测试结果表明:系统能够为用户实时提供汽车电池各项数据,系统响应指令的时间约为6 ms,且具有局域网内的OTA升级功能,实现了设计目标。展开更多
This paper presents a systematic investigation and demonstration of a K-band circularly polarized liquidcrystal-based phased array(LCPA),including the design,over-the-air(OTA)in-array calibration,and experimental vali...This paper presents a systematic investigation and demonstration of a K-band circularly polarized liquidcrystal-based phased array(LCPA),including the design,over-the-air(OTA)in-array calibration,and experimental validation.The LCPA contains 16 phase-shifting radiating channels,each consisting of a circularly polarized stacked patch antenna and a liquid-crystal-based phase shifter(LCPS)based on a loaded differential line structure.Thanks to its slow-wave properties,the LCPS exhibits a maximum phase-shifting range of more than 360°with a figure of merit of 78.3(°)·dB^(-1)based on a liquid crystal layer with a thickness of only 5μm.Furthermore,an automatic OTA calibration based on a state ergodic method is proposed,which enables the extraction of the phase-voltage curve of every individual LCPA channel.The proposed LCPA is manufactured and characterized with a total profile of only 1.76 mm,experimentally demonstrating a scanned circularly polarized beam from-40°to+40°with a measured peak gain of 12.5 dBic and a scanning loss of less than 2.5 dB.The bandwidth of the LCPA,which satisfies the require-ments of port reflection(|S_(11)|)<-15 dB,an axial ratio(AR)<3 dB,beam squinting<3°,and a gain variation<2.2 dB,spans from 25.5 to 26.0 GHz.The total efficiency is about 34%,which represents a new state of the art.The use of the demonstrated low-profile LCPA to support circularly polarized scanning beams,along with the systematic design and calibration methodology,holds potential promise for a variety of millimeter-wave applications.展开更多
基于无人驾驶领域的飞速发展,为提高道路行人目标检测的速度和精度,提出一种基于YOLOv5网络改进的YWYOLO的道路行人目标检测方法,在YOLOv5模型的neck结构中改入RepGFPN,充分交换高级语义信息和低级空间信息,添加自适应融合机制,引入SimA...基于无人驾驶领域的飞速发展,为提高道路行人目标检测的速度和精度,提出一种基于YOLOv5网络改进的YWYOLO的道路行人目标检测方法,在YOLOv5模型的neck结构中改入RepGFPN,充分交换高级语义信息和低级空间信息,添加自适应融合机制,引入SimAM注意力模块机制,提高算法的特征提取能力,在损失函数方面,使用Optimal Transport Assignment优化损失函数。实验结果表明,所提算法与原算法相比,在道路行人类别数据集上识别精确率由38.1%提升到52.6%,检测速度由29.4 fps提高到30.8 fps,具有更好的检测效果。展开更多
2023年12月10日,理想汽车正式发布OTA 5.0,并宣布计划于12月19日开启全量用户推送。通过智能驾驶(AD Max 3.0)、智能空间(SS3.0)和智能增程(REV 3.0)三大软件升级,OTA 5.0为理想L系列车型带来产品力全面进化,成为理想汽车史上最强OTA。...2023年12月10日,理想汽车正式发布OTA 5.0,并宣布计划于12月19日开启全量用户推送。通过智能驾驶(AD Max 3.0)、智能空间(SS3.0)和智能增程(REV 3.0)三大软件升级,OTA 5.0为理想L系列车型带来产品力全面进化,成为理想汽车史上最强OTA。智能驾驶平台方面,理想L系列的Max车型升级为AD Max 3.0,全场景智能驾驶(NOA)、全场景辅助驾驶(LCC)、智能泊车和主动安全能力全面升级。展开更多
文摘针对目前控制器局域网(Controller Area Network, CAN)总线技术通信速度较慢、带宽有限以及可扩展性差等弊端,利用车载以太网技术实现车内控制器与车联网控制单元T-Box的局域网通信,以实现数据的存储和收集。在嵌入式平台STM32F429VIT6移植FreeRTOS操作系统和LwIP网络协议栈,通过OTA技术完成系统软件的远程升级。测试结果表明:系统能够为用户实时提供汽车电池各项数据,系统响应指令的时间约为6 ms,且具有局域网内的OTA升级功能,实现了设计目标。
基金supported in part by the National Natural Science Foundation of China(NSFC62122019 and 62293492)+2 种基金the National Key Research and Development Program of China(2019YFB2204704)the Fundamental Research Funds for the Central Universitiesthe Zhishan Scholar Program of Southeast University(2242022R40038).
文摘This paper presents a systematic investigation and demonstration of a K-band circularly polarized liquidcrystal-based phased array(LCPA),including the design,over-the-air(OTA)in-array calibration,and experimental validation.The LCPA contains 16 phase-shifting radiating channels,each consisting of a circularly polarized stacked patch antenna and a liquid-crystal-based phase shifter(LCPS)based on a loaded differential line structure.Thanks to its slow-wave properties,the LCPS exhibits a maximum phase-shifting range of more than 360°with a figure of merit of 78.3(°)·dB^(-1)based on a liquid crystal layer with a thickness of only 5μm.Furthermore,an automatic OTA calibration based on a state ergodic method is proposed,which enables the extraction of the phase-voltage curve of every individual LCPA channel.The proposed LCPA is manufactured and characterized with a total profile of only 1.76 mm,experimentally demonstrating a scanned circularly polarized beam from-40°to+40°with a measured peak gain of 12.5 dBic and a scanning loss of less than 2.5 dB.The bandwidth of the LCPA,which satisfies the require-ments of port reflection(|S_(11)|)<-15 dB,an axial ratio(AR)<3 dB,beam squinting<3°,and a gain variation<2.2 dB,spans from 25.5 to 26.0 GHz.The total efficiency is about 34%,which represents a new state of the art.The use of the demonstrated low-profile LCPA to support circularly polarized scanning beams,along with the systematic design and calibration methodology,holds potential promise for a variety of millimeter-wave applications.
文摘基于无人驾驶领域的飞速发展,为提高道路行人目标检测的速度和精度,提出一种基于YOLOv5网络改进的YWYOLO的道路行人目标检测方法,在YOLOv5模型的neck结构中改入RepGFPN,充分交换高级语义信息和低级空间信息,添加自适应融合机制,引入SimAM注意力模块机制,提高算法的特征提取能力,在损失函数方面,使用Optimal Transport Assignment优化损失函数。实验结果表明,所提算法与原算法相比,在道路行人类别数据集上识别精确率由38.1%提升到52.6%,检测速度由29.4 fps提高到30.8 fps,具有更好的检测效果。
文摘2023年12月10日,理想汽车正式发布OTA 5.0,并宣布计划于12月19日开启全量用户推送。通过智能驾驶(AD Max 3.0)、智能空间(SS3.0)和智能增程(REV 3.0)三大软件升级,OTA 5.0为理想L系列车型带来产品力全面进化,成为理想汽车史上最强OTA。智能驾驶平台方面,理想L系列的Max车型升级为AD Max 3.0,全场景智能驾驶(NOA)、全场景辅助驾驶(LCC)、智能泊车和主动安全能力全面升级。
