TACAN beacon transmits pulse amplitude modulation signals in all direction, including bearing and distance information relative to the beacon.
塔康信标台全向发射脉冲幅度调制信号，隐含空中目标相对于信标台的方位和距离信息。
The model of radar target is composed of distance, bearing, speed, heading and amplitude of echo, fluctuation.
目标模型包括船舶的距离、方位、速度和回波幅度、幅度起伏。
The previous view was that when the sandstone contains oil, the velocity will reduce, and the well oil-bearing reservoir should show weak amplitude feature in the seismic section.
过去一直认为：砂岩含油气后，速度降低，含油性好的储层在地震剖面上就表现为弱振幅特征。
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