一种基于相控阵天线的前向机载防撞系统

A Forward Traffic Alert and Collision Avoidance System Based on Phased Array Antenna

由于传统飞机的机载防撞系统天线突出飞机表面,对飞机天线布局和气动有一定在影响,且监视距离较近。设计了一种基于相控阵天线的前向机载防撞系统,综合利用飞机机翼等结构共形设计,与飞机同频段功能天线实现共用,降低了天线布局压力及对飞机气动影响。同时由于采用数字相控阵形成和/差波束的单脉冲测角的方式进行目标方位测算,相对于传统的双通道比幅/比相的测角方式,能够较大地提高系统对目标的测角精度,有效提升机载防撞系统性能。

Because the antenna of traditional aircraft s Traffic Alert and Collision Avoidance System(TCAS)protrudes from the surface of the aircraft,it has a certain influence on the antenna layout and aerodynamics of the aircraft,and the monitoring distance is relatively short.Through a forward TCAS based on phased array antenna,the conformal design of aircraft wing and other structures is comprehensively utilized,which can be shared with the functional antenna in the same frequency band of the aircraft,thus reducing the pressure of antenna layout and its aerodynamic influence on the aircraft.At the same time,monopulse angle measurement with sum-difference beam forming is used for its excellent performance in high precision of angle measurement,compared with traditional way of double-channel amplitude/phase ratio,the angle measurement accuracy of the system to the target can be greatly improved,and the performance of TCAS can be effectively improved.