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Find the Hochalpines Institut Ftan AG style guide with brand assets such as logos, colors, fonts, and more.

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FTAN (frequency-time analysis)是一种由两个台站之间互相关函数求出群、相速度频散的方法。 群到时 \tau (\omega_ {0}) 是高斯滤波器的中心频率（由 包络函数 的峰值确定中心频率）的函数，使得群速度 U (\omega_ {0})=r/\tau (\omega_ {0}) ，其中r为站间距。 定义 瞬时频率 为Analitic signal在时间τ时的相位变化的速率，使用瞬时频率代替中心频率。 \phi_ {a}=2\pi N,N=0,\pm1,\pm2..... 对于噪声互相关来说 \phi_ {a}=2\pi N-\pi/4,N=0,\pm1,\pm2.....