窄带色散系统的群时延与包络时延的关系
发布时间：2018-11-12 13:56
【摘要】：该文探讨了调制信号经过色散窄带系统时,群时延与相关时延之间的关系,分析了色散对系统时延校准的影响。当信号经过系统时,信号包络的时延主要由上升沿与下降沿的变形引起。对矩形脉冲调制、三角脉冲调制、余弦脉冲调制以及线性调频脉冲调制的研究表明,相关时延不等于系统在载波频率点的群时延,近似为群时延的加权平均,加权值为信号频谱分布与系统幅度响应的乘积。利用群时延对系统相关时延校准时,系统相位响应的线性度越好,校准精度越高。
[Abstract]:In this paper, the relationship between group delay and correlated delay when modulation signal passes through a dispersive narrowband system is discussed, and the influence of dispersion on system delay calibration is analyzed. When the signal passes through the system, the delay of the envelope is mainly caused by the deformation of the rising and descending edges. The researches on rectangular pulse modulation, triangular pulse modulation, cosine pulse modulation and linear frequency modulation show that the correlation delay is not equal to the group delay at the carrier frequency point, but is approximately the weighted average of the group delay. The weighted value is the product of the signal spectrum distribution and the amplitude response of the system. The better the linearity of phase response of the system is, the higher the calibration accuracy is when the group delay is used to calibrate the correlated delay of the system.
【作者单位】： 清华大学电子工程系;空军空降兵学院二系;
【基金】：国家973计划项目(2013CB329002) 国家自然科学基金(61371012)资助课题
【分类号】：TN911.3
[Abstract]:In this paper, the relationship between group delay and correlated delay when modulation signal passes through a dispersive narrowband system is discussed, and the influence of dispersion on system delay calibration is analyzed. When the signal passes through the system, the delay of the envelope is mainly caused by the deformation of the rising and descending edges. The researches on rectangular pulse modulation, triangular pulse modulation, cosine pulse modulation and linear frequency modulation show that the correlation delay is not equal to the group delay at the carrier frequency point, but is approximately the weighted average of the group delay. The weighted value is the product of the signal spectrum distribution and the amplitude response of the system. The better the linearity of phase response of the system is, the higher the calibration accuracy is when the group delay is used to calibrate the correlated delay of the system.
【作者单位】： 清华大学电子工程系;空军空降兵学院二系;
【基金】：国家973计划项目(2013CB329002) 国家自然科学基金(61371012)资助课题
【分类号】：TN911.3
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