摘要
在实验室进行雷达模拟时,需要产生高信噪比的调制在中频或射频的宽带雷达信号。宽带雷达信号的产生包括2个方面:信号重构和调制。在数字正交调制原理的基础上,宽带信号的产生问题实际上转换为如何得到高采样率下的时域基带信号。本文提出了一种频域补零的内插方法来重构高采样率下的基带信号,简捷、快速、精确。利用快速傅里叶变换(FFT)的算法原理适当改进后,采用优化算法进行傅里叶反变换,极大地减少了运算量。最后,通过计算机仿真,证实了该重构方法的可行性。
As radar simulating in laboratory, it needs to generate the wide-band radar signal modulated by intermediate or radio frequency signal with high ratio of signal to noise. The procedure of wide-band radar signal generation includes two parts：signal reconstruction and modulation. Based on the principle of digital orthogonal modulation, the generation question of wide-band signal is factually identical with how to generate base-band signal with high sampling in time domain. In the paper, a method of reconstructing high sampling base-band signal was proposed, which was the simplified interpolation by zero augmented spectrum. It has characteristics of concise, fast and accurate. By the principle of fast Fourier transform algorithm, an optimized algorithm is utilized to carry out inverse discrete Fourier transform. So the operand is reduced enormously, which is advantageous for enhancing system property of timeliness. Finally, the computer simulation indicates that they are available and feasible.
出处
《电子测量技术》
2007年第3期29-31,共3页
Electronic Measurement Technology
关键词
宽带信号
数字正交调制
重构
内插
FFT
wide-band signal
digital orthogonal modulation
reconstruction
interpolation
FFT
