精密柔索传动天线座结构设计

通信技术向高频段、窄波束方向发展，对天线的指向精度提出了更高的要求。传动回差对天线的指向精度具有重要影响，为满足未来通讯技术的发展需求，文中研制了具有低空回特性的精密柔索传动天线座。基于柔索摩擦的欧拉公式推出了钢丝绳预紧力和天线座负载的关系，进而根据天线座负载力矩计算出钢丝绳的结构参数和预紧用碟形弹簧的结构参数。结构布局选用传统的俯仰–方位型座架，方位位于俯仰上方。张紧装置采用碟形弹簧从钢丝绳的端部进行预紧，可对多股存在长度误差的钢丝绳同时实现预紧。对原理样机的回差检测结果显示，该天线座具有明显的低空回特性，因此精密柔索传动在提升天线指向精度方面具有很大的应用潜力。

Structure Design of an Antenna Pedestal Based on Precise Cable Drive

With the development of communication technology in the direction of high frequency and narrow beam, higher requirements for pointing accuracy of antennas are put forward. In order to meet the requirements of the communication technology in the future, an antenna pedestal driven by precise cable with smaller transmission backlash, which has an important influence on the pointing accuracy, is developed in this paper. The relationship between wire rope preload and antenna load is presented based on the Euler formula for cable friction, and then the structure parameters of the wire rope and disk spring for pre tightening are calculated according to the load moment of the antenna. The layout of the pedestal is the elevation over azimuth. A set of disc springs that tenses the wire rope from its end is used as a tensioner, which can tense multiple wire ropes with different length errors simultaneously. The backlash detection results of the principle prototype show that the antenna pedestal has obvious smaller transmission backlash. Therefore, precise cable drive has great application potential in improving the pointing accuracy.