...学影像论坛] R图像分割方法及其进展 根据磁共振成像原理，通过不同的脉冲时间（time of repeat，TR）和回波时间（time of echo，TE），可以获得信号强度不同的T 1 、T 2 和质子密度（proton density，PD）三种加权像...
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光子计数成像激光雷达需要测量一个激光主波和与之对应的多个回波之间的时间间隔，并具有高精度。
The time intervals between laser main pulse and the corresponding multiple echoes were needed to measure in photon counting imaging lidar, and the system had to have high precision.
这些信号分别为模拟回波信号的生成提供了天线增益大小、时间基准、相位基准和载波频率大小等重要的参考信息。
These signals provide an important reference of the gain of antenna, the time reference, the phase reference and the frequency of carrier wave for generating stimulant echo signal.
较强的降水时段和有效的连续降水将大幅度消弱回波强度，并使其较长时间地维持在低指数状态，其相应能见度也大为改善。
Relatively strong rainfall period and effectively continuous rainfall can make the echo intensity decrease greatly and remain the low index for a long time, and the visibility turns well.
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