Clutter is connatural condition of signal measuring and processing, which affect the radar's detectability and tracking ability of low-altitude target seriously.
杂波是雷达信号检测和处理的固有环境，严重影响了雷达低空目标探测与跟踪的性能。
We study the performance of turbocharged diesel engine working in different altitude regions by a computerized atmospheric simulation and comprehensive measuring system.
采用微机化大气模拟测控系统对增压柴油机在不同海拔地区的性能进行了大量的专题试验研究。
By measuring the refraction of this radio beam, we will be able to plot the temperature and density profile of Pluto's atmosphere from high altitude down to the surface.
借由测量无线电波的折射，我们可以描绘出冥王星大气层(从高空一直到表面)的温度与密度分布轮廓。
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