一种多通道观测系统数字接收技术研究  

Research on digital receiving technology for a multi-channel observation system

作　　者：韩雪莲[1] 童智勇[2] 杨汝良[2] 

机构地区：[1]国家知识产权局专利审查协作北京中心,北京100190 [2]中国科学院电子学研究所,北京100190

出　　处：《现代电子技术》2015年第7期52-57,共6页Modern Electronics Technique

摘　　要：太阳射电观测系统提出信号频段跨度大、观测频点多且频率及频点带宽可变、高精度多通道信号时间同步等要求。在此研究并采用奈奎斯特中频采样、多通道并行数字正交解调、滤波抽取得到数字基带信号。给出适合高倍率抽取的级联高效滤波器结构和易于工程使用的CIC滤波器幅度补偿方法。采用可编程延迟器实现系统高精度时间同步要求。完成了基于FPGA的硬件编程与硬件资源评估,使用线性调频信号作为测试信号在评估板上进行实际测试。结果表明在不同工作模式下,400 MHz带宽信号在脉冲重复时间内可被滤波抽取输出16路带宽可变的窄带正交基带信号,通带幅度平坦度、相位正交度等指标符合系统要求。最后讨论了硬件资源使用情况和潜在的性能升级空间。Solar radio heliograph observation system is a multi-bandwidth,multi-mode and high precise multi-channel syn-chronization system. Nyquist IF sampling,multi-channel parallel digital quadrature demodulation,multi-rate decimating are used to acquire the base-band digital signal in this paper. A modified frequency response compensation approach suitable for CIC filter is presented. A programmable delay device is used to realize high precise multi-channel signal synchronization. VHDL programming and hardware resource assessment based on FGPA were achieved. The actual test on a evaluation board shows that the intermediate frequency signal with the bandwidth of 400 MHz can be filtered and decimated to 16-channel narrow quadrature baseband signal which bandwidth can be changed according to the system operation mode. The amplitude flatness and phase or-thogonality of the output signal can satisfy the requirements of the system. At last,the consumption of the hardware resource and capacity of potential upgrade are discussed.

关 键 词：多通道观测系统 数字接收机 数字正交解调 现场可编程门阵列 

分 类 号：TN957.523.4[电子电信—信号与信息处理]