摘要
该设计利用FPGA的嵌入式软核NiosⅡ处理器,通过嵌入式操作系统μC/OS-Ⅱ,实现了在FPGA内的自相关计算器;利用FPGA强大的并行运算功能和自带存储器实现的"乒乓"RAM,通过软核NiosⅡ输出控制字实时切换调用两个"乒乓"RAM的存储和读取功能,使之同时完成对采集数据的缓冲存储和向乘法器提供计算数据的功能,使芯片的整个数字处理链路连续化。另外,采用多比特进行自相关运算较之于现在天文台使用的1 b量化自相关器,能有效地提高SNR退化比。
The autocorrecting computing makes use of the Nios Ⅱ software processor with embedded system μC/OS-Ⅱ.Taking advantage of FPGA′s powerful parallel computing function and the embedded memory in FPGA can get the ＂Ping-Pang＂ RAM.changing the ＂Ping-Pang＂ RAM′s storage and reading functions by the controlling of Nios Ⅱ software processor to make the RAMs achieving the data sampling and supplying data to multiplication functions,what lead the processor′s processing continuously.In addition,comparing to the 1-bit sampling which some observatories are using this design which use the 12 - bits sampling can increase the SNR degradation proportion effectively.
出处
《现代电子技术》
2009年第18期20-24,共5页
Modern Electronics Technique
基金
国家973计划资助项目:日地空间灾害性天气的发生
发展和预报研究(2006CB806300)
