【摘要】 针对北斗卫星导航系统（BDS）发射的信号可能受到强烈干扰的问题，本文提出了一种用于北斗的时间调制阵列（TMA）。信号通过各个阵元所配备的开关按照给定的调制时序被调制至指定幅度、相位，阵列所需的延迟线的相移由圆极化微带天线的4个能够激励具有不同相位的圆极化波的端口提供。此设计对比现有的时间调制阵列方案减少了天线后端开关的数量，一定程度降低了系统的插入损耗。对比相控阵，该阵列使用开关替代了移相器，使得其具有较低的成本。通过对1×4均匀直线阵进行实验测试，验证了该系统的有效性。更多还原

【Abstract】 In this article, an anti-jamming time-modulated array(TMA) for Beidou satellite navigation system(BDS)is proposed to address potential strong interference issues. The TMA structure is constructed using multiple fixed delay lines and a pair of single-pole-four-throw(SP4T) radio frequency(RF) switches. Each element is equipped with two SP4T RF switches, which excite the square microstrip antenna in different ports to generate circularly polarized wave. The number of RF switches in each channel is reduced to one to get a better insertion loss. In each modulation period, no more than three selected equivalent delay lines are connected successively with proper pulse durations to keep the switches in ON states constantly and ensure maximum efficiency in the feeding network. Compared to phased arrays, the TMA uses switches instead of phase shifters, making it cheaper. Measurement results indicate that the TMA has the ability of beam scanning.更多还原