机载惯导精度对动中通天线跟踪的影响分析

Effect Analysis of Airborne INS Precision on Antenna SOTM Tracking

随着各种低剖面平板天线的出现,机载卫星通信得到迅猛发展。在使用较高频段（如Ka或Ku频段）的卫星通信系统中,天线的波瓣宽度很窄。为保证天线在载体高速运动过程中严格对准卫星,必须采取一定的方法对波束进行跟踪。地面常用的方法有单脉冲跟踪、圆锥扫描跟踪和步进跟踪,这三种方法在地面动中通卫星通信系统中得到了广泛应用。但是航空电子对设备的体积、重量以及可靠性有着极为苛刻的要求。这三种方法有一个共同的特征,跟踪伺服机构复杂,体积重量以及可靠性很难满足航空电子的要求。鉴于目前绝大多数飞机都采用了激光惯导系统,能够很好的提供高精度的载体姿态信息,为论证采用惯导信息天线实现开环跟踪的可行性,本文专门针对一种即将装机的机载Ku频段动中通天线,分析了惯导的精度和输出刷新速率对天线跟踪的影响。

With the emergence of a variety of low profile panel antenna, the airborne satellite commu- nication has developed fast. In the higher frequency band （e. g. Ka or Ku band） satel- lite communication system, the antenna beam width is very narrow. To ensure the strict alignment of antenna to the satellite during the fast moving of the carrier, some methods must be taken to track the beam. Monopulse tracking, conical-scanning tracking and step trackingl are the most popular tracking methods used in ground mobile satellite communi- cation systems. But the airborne electronics has extremely stringent requirements for the size, weight and reliability of the devices, which these tracking methods cannot reach.Nowadays most aircrafts can provide high-precision attitude information by the laser inertial navigation system. In order to prove the feasibility of the open-loop track method using the INS information antenna, this paper analyzes the effect of the precision and output fre- quency of the INS in the airborne Ku-band antenna SOTM tracking