摘要
激光脉冲信号通过大气等介质时,受到大气中各种天气因素影响,将导致波形形变、脉冲宽度发生变化以及时域展宽。一般在大气散射和湍流的介质中,脉冲的传播很适宜用双频互相干函数来表示。利用双频相关函数求解雾对10.6μm激光数字信号传输的幅频和相频函数以及双频互相关函数的影响,并结合雾对激光影响的散射理论,得出脉冲的起伏特征,模拟不同能见度下激光脉冲的展宽。结果表明雾的能见度对脉冲的展宽具有明显的影响。
When the laser pulse signal transmits through the mediums such as atmosphere,it may be affected by various weather factors,which will result in the waveform and pulse width change and the time domain stretch.Commonly it is adaptive to use the two-frequency mutual coherence function to express the pulse transmission in the atmosphere scattering and turbulence mediums.This article utilizes two-frequency correlation function to calculate the influence of fog on the amplitude-frequency and phase-frequency function two-frequency mutual coherence function of 10.6 μm laser digital signal transmission,and educes the pulse undulation characteristic combining with the scattering theory of the influence of fog on the laser,simulates the pulse stretch in different visibility.The results indicate that the fog visibility can affect the pulse stretch evidently.
出处
《舰船电子对抗》
2011年第1期55-57,98,共4页
Shipboard Electronic Countermeasure
关键词
激光脉冲信号
信号传输
雾
双频互相关函数
laser pulse signal
signal transmission
fog
two-frequency mutual coherence function
