摘要
对线性调频(LFM)信号的三种主要数字产生方法进行分析,提出一种基于波形存储直读法的超宽带线性调频脉冲压缩信号数字产生系统方案。探讨了系统数字基带中的幅度量化位数和采样频率、正交调制器的非理想性、倍频电路中的误差因素和中频LFM信号有时域畸变时对输出信号性能的影响,为超宽带系统工程实现时参数选择、性能评估和性能优化提供重要的理论依据和经验参考。
Three main digital methods for linear frequency modulated （LFM） waveform generation are compared and analyzed. On the basis of the waveform storage method, a digital generation system scheme for ultra wide-band LFM pulse compression signals is proposed in this paper. The performances of the digital system is investigated in detail including the effects of amplitude quantization bits and the sampling frequency at digital base-band, the non-idealization of the quadrature modulator, spurs involved in the frequency multiplier, and the distortion of intermediate frequency LFM signals in time domain on the performance of output signals. The results are f＇mally proved by computer simulations and therefore provide important theoretical bases and experiential references for parameters selection, performance evaluation, and performance optimization of ultra wide-band systems.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2008年第2期210-213,共4页
Journal of University of Electronic Science and Technology of China
关键词
误差分析
倍频器
脉冲压缩
正交调制器
超宽带线性调频信号
波形存储直读法
errors analysis
frequency multiplier
pulse compression
quadrature modulator
ultra wide-band linear frequency modulated signals
waveform storage method
