摘要
无人机数据链路由于多径传输,其信道为频率选择性衰落,码间干扰是影响数据传输速率的主要因素;采用正交频分多址(OFDM)调制技术是对抗多径传输、提高传输速率的主要方法;在对系统架构和各项指标研究分析后,提出了一种基于TI开放式多媒体应用平台(OMAP1621)架构的宽带无线通信-无人机地空通信系统高速实时数据采集及传输设计方案,重点介绍了数据传输设计方案的硬件设计、驱动及时序控制,并给出了CPLD中串并和并串数据转换的仿真结果;根据该设计方案完成的数据采集系统在实际的样机演示中表现出了良好的性能,各项指标均满足系统设计要求,达到了预期的效果。
Mobile radio communication channels from an unmanned aerial vehicle （UAV） to ground stations are time--varying multipath channels. These frequency--selective fading channels may result in serious intersymbol interference, and consequently limit the rate of communication data. Using orthogonal frequency--division multiplexing （OFDM） can combat the intersymbol interference to increase the symbol rate. A data acquisition scheme is presented for a data transmission between UAV and ground stations. The scheme is based on OMAP1621 （open multimedia application platform）. Focuses on the design of the hardware, corresponding to software driver and timing sequence control of the acquisition system. At same time, present the CPLD--based simulation results of data parallel--to--series and series--to--parallel transformation. After being measured, the actual acquisition system accomplished dependent on our scheme have perfect performance, and all specifications satisfy the design requirements.
出处
《计算机测量与控制》
CSCD
2008年第10期1502-1505,1509,共5页
Computer Measurement &Control
基金
陕西省自然科学基金项目(2006F38)
