echo ranging [测] 回声测距 ; [测] 回波测距 ; 回波测距法回声测距 ; 回音测距
echo ranging sonar 回声测距声纳 ; 回声定位声纳 ; [声] 回声测距声呐
echo ranging apparatus 回声测距仪
echo-ranging equipment 回声测距设备
explosive echo ranging 爆炸回声定位
echo-ranging system 回声测距系统
combined echo ranging echo sounding 统一的回声测距与测深
As an important feature, the characteristics of echo stretching affects SNR of received laser echo signal and ranging accuracy.
脉冲展宽特性是激光回波的重要特性，其影响到回波接收信噪比和测距精度。
Theprinciples of the laser active reconnaissance are explained via the comparison of the echo signal. target ranging isrealized by adopting the principle the pulse laser ranging.
通过对比研究激光对漫反射大目标、小目标和“猫眼”光学镜头的回波信号，给出激光主动侦察原理：对目标的距离测量应用脉冲激光测距原理实现；
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。
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