摘要： 航天测控地面站的系统品质因数(G/T值)测量一般采用对塔测量、对射电星测量及对同步卫星测量等方法。目前国内大部分用于接收低轨卫星Ka频段宽带数据的12 m口径地面站均无法采用常规方法进行G/T值测量，同时传统的计算公式在Ka频段也无法满足G/T值测量精度的要求。针对该问题，提出了利用无人机在满足远场和仰角条件下的测试方法，给出了待误差修正的计算公式，对该方法下的大气损耗、无人机定位精度、信标功率修正及指向精度等影响因素进行了分析和计算，在试验场进行了对比试验，证明利用该方法测量Ka频段的G/T值可行且精度满足要求，解决了目前大部分地面站Ka频段G/T值无法准确测量的问题。

中图分类号： V556.1
文献标识码： A
DOI：10.16157/j.issn.0258-7998.222680
中文引用格式： 盛保印. 地面站Ka频段G/T值测量方法研究[J].电子技术应用，2022，48(8)：140-144.
英文引用格式： Sheng Baoyin. The research of Ka-band G/T measurement method for TT&C system[J]. Application of Electronic Technique，2022，48(8)：140-144.

The research of Ka-band G/T measurement method for TT&C system

Abstract： The TT&C system usually use calibration tower，radio star or geostationary satellite for G/T measurement.Now our country build a group of TT&C systems for the data reception of low earth orbit Ka-band satellites.The size of these antennas ie 12 meter in diameter.Most of these TT&C systems can not use conventional methods for G/T measurement.At the same time,general formula can not meet the accuracy requitement for Ka-band G/T calculation.To solve the problem,this paper gave a formula and solution with drone for Ka-band G/T calculation.Under the method,this paper analyzed and calculated the effects of atmospheric attenution，positioning accuracy of drone，radio beacon′s signal amplitude variation and antenna′s pointing accuracy.The effectiveness of this method was verified in a proving ground.The method sovles the problem that most TT&C systems can not measure G/T at Ka-band.

Key words : G/T measurement；Ka-band；atmospheric attenution