本文用711测雨雷达实测的冰雹云过程回波资料，分析了大小回波在雹暴形成中的演变过程以及回波强度和回波高度间的关系。
The evolvement of echo during the formation of hail storm and the relation of echo intensity with its height are analyzed by use of echo data. of the 711 rain radar.
推导了雾、霾、云、大气的衰减随高度变化的规律，给出了云层激光回波特性的计算公式。
We get rules of the attenuation of fog, cloud, haze and atmosphere as the height changes, and give the calculation formula of the laser scattering character of cloud layer.
介绍采用数字信号处理的超声端点反射回波声程测量裂纹高度的方法研究和结果。
The measurement of crack height by ultrasonic edge peak echo method and digital signal processing was described, and the results were given.
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