摘要
针对测速应答机中信号转发的相位误差问题,提出一种在计算相参转发频率的过程中增加计算变量位宽,从而降低信号相位误差的方法,同时对转发性能进行了分析,数字中频处理过程中环路振荡器频率、DDS输出频率以及转发比量化误差为影响测速应答机相位误差的主要因素。仿真验证及试验结果表明,在满足产品设计指标的条件下,可适当提高该变量的计算位数,能有效降低数字量化导致的相位误差,提高转发精度,使相位误差主要受限于频率源稳定度指标,该方法可在通过工程实践验证后推广应用至数字收发信机中。
By increasing the variable bits width during calculation of the coherent transmitting frequency,an approach to reducing the signal phase induced by velocity measurement transponder is proposed.The transmitting performance is also analyzed.The major factors that influence the phase error are loop oscillator frequency,DDS output frequency and transmitting ratio quantization error during digital intermediate frequency processing.The simulation verification and experimental results indicate that appropriately increasing the calculated bit width of these variables can effectively reduce the phase error caused by digital quantization and improve the transmitting signal precision.Then the phase error is mainly limited by the stability of frequency source.This method can be applied to digital transceiver after being verified by engineering practice.
作者
叶雷
李忞詝
梁琴琴
崔颖升
YE Lei;LI Minzhu;LIANG Qinqin;CUI Yingsheng(Shanghai Aerospace Electronic Technology Institute,Shanghai 201109,China)
出处
《无线电工程》
北大核心
2021年第2期123-128,共6页
Radio Engineering
基金
国家部委基金资助项目。
关键词
测速应答机
数字信号处理
相参转发
相位误差
精度
velocity measurement transponder
digital signal processing
coherent transmitting
phase error
precision
