(页数:4字数:2559)摘 要： 在利用直接数字合成方法产生周期性宽带通信对抗背景信号时,信号的频率分辨率、带宽及频谱复杂度直接受限于合成系统的工作频率和存储容量.本文提出两种波形序列,能够在不改变合成系统工作频率和存储容量并且不影响合成信号的幅频包络和基本时域特性的情况下将其频率分辨率提高四倍以上,并且可以提高合成信号的频谱复杂度和可变性.这两种序列还可用于其它高频率分辨率周期信号的直接数字合成.
关键词： 通信对抗；直接数字合成；频率分辨率；幅频包络
Two Waveform Sequences for Improving the Frequency Resolutions of Direct Digitally Synthesized Communication Signals
TIAN Xin-guang1,3, GAO Li-zhi2,3, ZHANG Er-yang1
(1. School of Electronic Science and Engineering, National University of Defense Technology, Changsha, Hunan 410073,China；
2. Department of Electronic Engineering, Tsinghua University, Beijing 100084, China；
3. Research Institute of Beijing Capitel Group Corporation, Beijing 100016, China)
Abstract: In the direct digital synthesis of periodic communication signals for communication countermeasure experiments, the frequency resolutions, bandwidths and spectral complexities of the synthesized signals are limited by the working frequency and data capacity of the synthesizing system. This paper presents two waveform sequences applied to improve the frequency resolutions and spectral complexities of the synthesized periodic signals without changing their spectral envelopes and basic time-domain properties under the condition of fixed working frequency and data capacity. The two sequences are applicable to the digital synthesis of some other periodic signals.
Key words: communication countermeasure；direct digital synthesis；frequency resolution；spectral envelope
目录:
1 引言
2 直接数字合成原理及信号频谱分析
3 两种波形序列及其DFT分析
4 结论
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