一种多星测控下行多址干扰分析方法

摘要

Aim at the problem of TT&C during the launch of one vehicle with multi-satellite,a method of downlink multiple-access interference analysis for the TT&C link of multi-satellite to Earth station is proposed.A simplified model of electromagnetic simulation of satellite-rocket combinations is constructed.The method of combining the electromagnetic simulation and multi-satellite interference intensity analysis is used to evaluate the upper bound of the jam-to-signal ra-tio of the disturbed signal,and to verify the compatibility of the system.As an example,one ve-hicle with double satellites of medium earth orbit with series structure,according to the complex constraints of configuration layout and the use of time in launching phase,this method is used to evaluate and analyze the downlink code division multiple-access interference intensity of the spread spectrum TT&C signal with a single station is simultaneous receiving the downlink signals of double satellites,and the flight test of double satellites in launching phase is carried out.The results show that the method can effectively analyze the intensity of multiple-access in-terference intensity,and meet the practical requirements.The method provides effective support for verifying the compatibility of the system design of the double satellites and ground station and the use strategy of the ground station during the flight control of satellite and rocket.It can pro-vide reference for similar multi-obj ective TT&C engineering application.%针对一箭多星发射过程中的多星测控问题,提出了一种适用于多星星地测控链路的下行码分多址干扰分析方法,构建了星箭联合体电磁仿真简化模型,并采用电磁仿真预测与多星干扰强度分析相结合的方法,评估受干扰信号的干信比上限,检验系统的兼容性.以构型为串联结构形式一箭双星发射的某中高度轨道双星为例,根据其主动段双星所处的构型布局和使用时机的复杂约束,分析评估单站同时接收双星下行码分多址扩频测控信号的多址干扰强度,并进行了双星主动段的在轨飞行试验.结果表明:该方法可有效分析多址干扰强度,满足工程实际应用需求.电磁仿真预测与多星干扰强度分析相结合的方法,为检验星地系统参数的兼容性,以及星箭飞行控制过程中地面站的使用策略提供了有效的支撑,可为类似的多目标工程应用提供参考.