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星载网状天线反射面作为大口径天线的重要结构部件,其面型精度直接影响天线的电性能。针对主要由抛物肋板、充气环、张力系统、中心鼓结构构成的网状天线反射面,采用数字摄影测试技术建立了反射面面型精度测试方案,获得了抛物肋板上普通标志点的空间坐标以及与最优抛物面之间的偏差,并开展了反射面面型精度的分析。为了提高网状天线反射面面型精度,提出了分阶段地依据各普通标志点偏差方向和大小调节肋板上节点至地面垂直距离的反射面面型调整方法。在阶段1至4中经过调整之后反射面面型精度分别提高了75.0%、54.3%、36.6%和37.4%,表明该天线面型调整方法的有效性。阶段4中网面的安装大大降低了抛物肋板的面型精度,同时抛物肋板的偏差趋势与阶段2偏差相近,所以前期阶段肋板的调整尤为重要,而反射面抛物肋板上的偏差主要分布于副肋。
As the important structural component of the large-aperture antenna, the reflection performance of the satellite-borne mesh antenna directly affects the electrical performance of the antenna. Aiming at the reticulated antenna reflector mainly composed of parabolic ribs, inflatable ring, tension system and central drum structure, a digital photogrammetric technique was used to establish the surface accuracy test scheme of reflective surface. The space of ordinary marker points on the parabolic ribbed plate was obtained Coordinates and the deviation from the optimal parabola, and analyzed the surface accuracy of the reflective surface. In order to improve the surface type accuracy of the mesh antenna, a method to adjust the surface shape of the reflective surface is proposed, which adjusts the vertical distance from the node on the rib to the ground according to the direction and size of each common marker. After being adjusted in the stages 1 to 4, the surface accuracy of the reflecting surfaces increased by 75.0%, 54.3%, 36.6% and 37.4%, respectively, indicating the effectiveness of the antenna surface adjustment method. The installation of the mesh in stage 4 greatly reduces the profile accuracy of the parabolic ribbed plate, and the deviation tendency of the parabolic rib plate is similar to that of the phase 2 deviation. Therefore, the adjustment of the rib plate is particularly important in the early stage, while the deflection on the parabolic ribbed plate Mainly distributed in the ribs.