Echoband consisting of convective clouds has different echo structure in different evolution stages. Water surface and mountains have an effect on it's evolution.
对流云回波带在初生、成熟和消散三个不同的演变阶段结构特征不同，下垫面对回波带的演变有一定的影响。
2
Includes fade-in, fade-out, volume normalize, band pass, chorus, flanger, echo and speed.
包括淡入，淡出，音量正常化，带通，合唱，镶边，回声和速度。
3
The target echo of passive radar based on FM signal has the characteristics of low SCR and narrow band. Only the receiver with large dynamic range can receive the weak echo signal.