基于改进调制宽带转换器的射电天文信号采样及恢复  

Sampling and recovery of radio astronomy signals based on improved Modulation Broadband Converter

作　　者：吴海龙[1] 柏正尧[1] 张瑜[1] 刘丹妮 檀磊[1] 

机构地区：[1]云南大学信息学院,云南昆明650500

出　　处：《云南大学学报（自然科学版）》2017年第5期739-746,共8页Journal of Yunnan University(Natural Sciences Edition)

基　　金：国家自然科学基金(U1231122);云南大学第八届研究生科研创新项目

摘　　要：为解决调制宽带转换器(Modulated Wideband Converter,MWC)在实现过程中{+1/-1}伪随机周期序列硬件电路难以实现的问题,提出了一种硬件电路容易实现的{0/Vs_max}伪随机周期序列,取消电压偏移电路,直接对信号发生模块输出信号进行放大处理,通过调节放大器参数产生需求的{0/Vs_max}周期伪随机序列.利用云南天文台实测的射电天文信号数据进行仿真实验,验证MWC系统对信号的重构性能.仿真结果表明,MWC系统采用{0/Vs_max}伪随机周期序列时降低了重构信号的均方误差,提高了重构精度,直接证明新提出的{0/Vs_max}伪随机周期序列在通道数大于16时MWC系统对原始信号重构的优异特性.In order to solve the problem that the { ＋ 1/-1 } pseudo-random cycle sequence is difficult to re-alize in the modulation broadband converter hardware circuit, {O/Vs_max}apseudo-random periodic sequencerealization in hardware circuit is proposed, cancel the voltage offset circuit, amplify the signal generation moduleoutput signal directly,by adjusting the amplifier parameters to generate {O/Vs_max} perioclic pseudo-randomseguence.The simulation experiment on the radio astronomy signals measured by the Yunnan Observatory is car-ded out to verify the reconstruction performance of the MWC sampling system.The simulation results show that theMWC system using {O/Vs_max} pseudo-random period sequence has better signal reconstruction performance,and directly proves that the proposed {O/Vs_max} pseudo-random periodic sequence is excellent for signal re-construction in MWC system. Key word： Sub-Nyquist sampling; Modulation Broadband Converter （ MWC ） ; radio astronomical signal ; sig-nal reconstruction

关 键 词：亚奈奎斯特采样 调制宽带转换器 射电天文信号 信号重构 

分 类 号：TN911[电子电信—通信与信息系统]