摘要
为了进一步改善智能嵌入式多媒体终端控制系统在车辆中的应用性能,提高系统定位准确性以及系统可靠性,提出基于策略推导的嵌入式多媒体终端控制系统设计方案;创建嵌入式多媒体文件传输协议,利用差错修复机制,简化嵌入式接收端工作流程,通过速率控制策略推导方法明确是否产生数据传输丢包事件;运用包对法预测链路带宽,完成多媒体终端高效率数据传输;采用Windows CE 5.0操作系统,以飞思卡尔i.MX31处理器为核心,构建支持多媒体播放、全球定位系统定位导航、可视倒车及倒车距离实时报警、车载蓝牙通话、调幅/调频收音机功能于一体的嵌入式车载多媒体终端控制系统。系统测试结果表明:该控制系统平均定位偏差为19%,与实际定位结果的偏差较小,有效地提高了车辆定位的准确性;不同时间段倒车影像的屏幕播放帧率均值为13.9 s^(-1),满足实际车载多媒体的应用需求。
To further improve application performances of intelligent embedded multimedia terminal control systems in vehicles,and improve system positioning accuracy as well as system reliability,a design scheme of embedded multimedia terminal control systems based on strategy derivation was proposed.An embedded multimedia file transfer protocol was created and error repair mechanism was used to simplify workflow of embedded receiving.Through rate control strategy derivation method,it was clear whether there was a data transmission packet loss event.Packet pair method was used to predict link bandwidth so as to complete efficient data transmission of multimedia terminals.By using Windows CE 5.0 operating system with Freescale i.MX31 processor as the center,an embedded vehicle-mounted multimedia terminal control system was constructed,which supported multimedia playback,positioning navigation by using global positioning system,real-time alarm of visual reversing and reversing distance,vehicle-mounted Bluetooth communication,and amplitude modulation/frequency modulation radio functions.The system test results show that the average positioning deviation of the control system is 19%,and the deviation from actual positioning results is small,which effectively improves accuracy of vehicle positioning.The average screen playing frame rate of reversing images in different time periods is 13.9 s-1,which meets application requirements of actual vehicle-mounted multimedia.
作者
薛峰
张跃进
XUE Feng;ZHANG Yuejin(College of Communication and Art Design,University of Shanghai for Science and Technology,Shanghai 200093,China;School of Information Engineering,East China Jiaotong University,Nanchang 330013,Jiangxi,China)
出处
《济南大学学报（自然科学版）》
CAS
北大核心
2021年第5期439-445,共7页
Journal of University of Jinan(Science and Technology)
基金
国家自然科学基金项目(11862006)
江西省自然科学基金重点(杰出青年)项目(2018ACB21032)。
关键词
多媒体终端
终端控制系统
策略推导
信息传输
multimedia terminal
terminal control system
strategy derivation
information transmission
