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The method of phased array altimeter beamforming based on rotation platform

机译：基于旋转平台的相控阵测高仪波束赋形方法

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In this paper, a phased array beamforming method based on the rotational platform is proposed. According to this method, the height of a platform can be measured accurately by adjusting the azimuth and elevation angles to keep the beam always point to the nadir point. Thus, the phased array altimeter needs to compensate the intersection change of the beam-point and the nadir point as a consequence of the platform translation and rotation. This paper deduces functions of angle error and phase compensation to calibrate the beam-point by establishing motion model of the platform, provides the method of weight calculating, and analyzes the update rate of weight. The curves illustrating the changes in directions of beam point as azimuth and elevation change respectively are provided by simulating. Finally, by means of simulation, making comparison between compensated and non-compensated antenna beam direction, we find the non-compensated beam is off nadir point with the changing motion of platform, while after compensating, the beam can be calibrated and pointed to the nadir again.
机译：提出了一种基于旋转平台的相控阵波束形成方法。根据此方法，可以通过调整方位角和仰角以使光束始终指向最低点来准确地测量平台的高度。因此，由于平台平移和旋转，相控阵高度计需要补偿波束点和最低点的相交变化。通过建立平台的运动模型，推导了角度误差和相位补偿功能，对光束点进行标定，提供了权重的计算方法，并分析了权重的更新率。通过仿真，分别提供了表示波束点方向随方位角和仰角变化而变化的曲线。最后，通过仿真，对补偿后的和未补偿的天线波束方向进行比较，发现随着平台的运动变化，未补偿的波束偏离了最低点，而经过补偿后，可以将波束校准并指向天线。再次达到最低点。

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