In order to provide simulated data source for LFMICW radar altimeter height detection algorithm, terrain return of LFMICW altimeter needs to be modeled and simulated.

为了给LFMICW雷达高度计高度提取算法提供计算机模拟数据源，需要对高度计的大地回波进行建模和仿真。

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Radar target environment needs to be deeply studied to improve properties of height detection algorithm, thus terrain return properties need to be analyzed and studied.

为了对雷达目标环境进行深入研究，以提高高度提取算法的性能，需要对回波特性进行分析研究。

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Unlike the familiar three of length, breadth and height, these extra dimensions are curled up so tightly that they elude detection (though scientists are trying to prise them open in particle accelerators like the Large Hadron Collider near Geneva).

ECONOMIST: Cosmology