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利用脉冲调制雷达信号的间歇性工作特点,不同波长的激光与雷达信号进行时分调制。啁啾光纤光栅将已调制射频信号的一串光脉冲序列进行反射延时,不同波长的激光序列在不同位置反射后产生不同时延。对载波频率等于4GHz的脉冲雷达信号进行实验测量,结果表明4个阵元的延时值与波束指向的理论延迟值一致,满足系统设计要求。
The use of pulse modulated radar signal intermittent characteristics of different wavelengths of laser and radar signals for time-division modulation. The chirped fiber grating reflects a series of optical pulse sequences of the modulated RF signal, and the laser sequences of different wavelengths reflect at different positions to generate different delays. The experimental measurement of the pulse radar signal whose carrier frequency is equal to 4GHz shows that the delay values of the four elements are consistent with the theoretical delay values of beam pointing to meet the system design requirements.