机载调频无线电高度表敏感特性分析

Researches on Sensitive Feature of Aircraft FM Radio Altimeter

在国际国内频谱资源有限性、稀缺性日益凸显的大背景下,多种业务共用频段已是必然。通过试验和仿真分析方法研究机载调频无线电高度表对雷达脉冲信号的敏感特性,期望实现二者的同频段共用。研究结果表明,处于同一频段的雷达脉冲信号会对机载调频无线电高度表产生有害干扰,雷达脉冲信号会影响高度表指示,使高度表示值不断增大直至满刻度,从而危及飞行安全。

In the background that the limited scarcity of the international and domestic spectrum resources is becoming more and more scarce,the common frequency band of various services is inevitable. This paper studies the sensitive characteristics of airborne FM radio altimeter to radar pulse signal through experiment and simulation analysis,and expects to achieve the same frequency band sharing between the two. The research results show that the radar pulse signal at the same frequency band will cause harmful interference to the airborne FM radio altimeter,and the radar pulse signal will affect the altimeter indication and increase the height indication value until the full scale,thus endangering the flight safety.