通信卫星不同带宽数字群时延测试技术实现

群时延特性是通信卫星转发器分系统重要的测试项目，目前通信卫星主要采用数字群时延测试方法，该算法设计之初是为了满足10 MHz量级转发器带宽的测试。随着通信卫星有效载荷技术的不断发展，通信带宽也呈现出多样化，从军用卫星的窄带通信（带宽10 kHz量级）到高通量卫星的宽带通信（带宽100 MHz量级），不同带宽对群时延测试指标和测试技术提出了不同的要求。本文在数字群时延测试方法的基础上，通过理论分析、MATLAB仿真和卫星工程测试验证等环节，对不同通信带宽下的转发器群时延测试系统、参数及算法进行优化设计，使其算法能够满足不同转发器带宽下的群时延特性测试。

Implementation of Different Bandwidth Digital Group Delay Test Technology for Telecommunication Satellite

The group delay characteristic is the important test item of transponder payload in telecommunication satellite, and the digital method of group delay test is mainly used for the level of 10MHz bandwidth transponder test. With the development of satellite payload technology, the bandwidth of communication is also diversified rang from narrowband transmission of military satellites (level of 10kHz bandwidth) to high-throughput satellite (level of 100MHz bandwidth). The difference of the transponder bandwidth puts forward higher requirements for group delay test system design. Through theoretical analysis, MATLAB simulation and hardware test and verification, the paper is mainly to optimize the algorithm and parameter of test technology to meet the different transponder bandwidth test requirements.