The principle of direct sequence spread spectrum ranging is introduced and the echo model of near field ranging is discussed.
论述了直接序列扩频测距的原理，研究了近距离测距的回波模型。
High frequency ground wave radar for near ocean inspection and ocean remote sensor is a method that use ocean echo wave Dopier spectrum to deduce the parameters of ocean situation.
高频地波雷达近海监测和海态遥感技术是一种利用海洋回波多普勒谱反演海态参数的方法。
Strong echo produces outflow near the surface.
强回波区的降水会在近地面产生出流。
Doubletalk detection(DTD) is used to sense whether the far-end speech is corrupted by the near-end speech in echo cancellation.
声回波对消中，双端语音检测用以判定远端语音是否混和有近端语音。
Doubletalk detection(DTD) is used to sense whether the far-end speech is corrupted by the near-end speech in echo cancellation.
声回波对消中，双端语音检测用以判定远端语音是否混和有近端语音。
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