摘要
计算了δ脉冲在等离子体中传播不同距离的波形 ,并用时频分析的方法研究了它们的时频特性。发现在信号到达的早期时频图存在若干显著的水平谱线 ,类似于离散谱 ,在信号到达的晚期时频图上有一条双曲形的曲线 ,对应于等离子体的频率 -群时延曲线。认识信号的时频特性对于从信号中提取等离子体的参数很有帮助。
In this paper, propagated δ pulses through different distance of plasma are calculated, and their time-frequency characteristics are studied using CWD (Choi-William Distribution). It is found that several horizontal spectrums appear at early arrival time like discrete spectrum, and at late time a hyperbolic curve lies in the time-frequency spectrum which corresponds to the frequency-group delay curve of plasma. To understand the time-frequency property of a signal is helpful for obtaining plasma parameters.
出处
《系统工程与电子技术》
EI
CSCD
2000年第8期31-33,共3页
Systems Engineering and Electronics
基金
国家自然科学基金资助课题 !(69831 0 2 0 )
