基于改进调制宽带转换器的射电天文信号采样及恢复

发布时间：2018-02-01 03:44

本文关键词： 亚奈奎斯特采样调制宽带转换器射电天文信号信号重构　出处：《云南大学学报(自然科学版)》2017年05期 　论文类型：期刊论文

【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.
[Abstract]:In order to solve the modulation wideband converter Modulated Wideband Converter. The hardware circuit of {1 / 1} pseudorandom periodic sequence is difficult to realize in the process of implementation of MWC. A kind of {0 / Vsmax} pseudorandom periodic sequence which is easy to be realized by hardware circuit is proposed. Canceling the voltage offset circuit and directly amplifying the output signal of the signal generation module. By adjusting the amplifier parameters to generate {0 / Vsmax} periodic pseudorandom sequence, the simulation experiment is carried out using the radio astronomical signal data measured by Yunnan Observatory. The simulation results show that the MWC system reduces the mean square error of the reconstructed signal and improves the reconstruction accuracy when using the {0 / Vsstmax} pseudorandom periodic sequence. It is proved directly that the new {0 / V _ S _ max} pseudorandom periodic sequence has excellent characteristics for the reconstruction of the original signal in the MWC system with a channel number greater than 16:00.
【作者单位】：云南大学信息学院;
【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
【分类号】：P161;TN911.7
【正文快照】： 天文观测是探究宇宙奥秘最为重要手段之一,随着科学技术迅猛发展和高精新仪器的出现,对射电天文学的观测研究呈现向低频和甚高频发展的趋势[1],射电天文信号谱线有多条,且谱线频率都很高,从MHz到GHz的谱线频率都存在[2],在这种情况下,现有模数转换芯片在硬件上难以满足超高采

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