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为获得高效的合成孔径激光雷达信号,提出一种通过精密控制谐振腔提高激光线性调频信号有效功率的方法,并描述了激光器的调频实现。首先,分析驱动信号获得其傅里叶谱,获知调腔信号有效功率低的原因在于调腔器件对信号高次谐波响应较差;通过在谐振腔驱动电路中引入了高次谐波响应模块,最终有效地减小了信号调频波形下降沿,提高了合成孔径激光雷达信号的有效功率。对所获得的调频信号性能指标进行了测试,结果表明,调频周期为1 ms时,调频带宽达到了789 MHz,信号功率中有用功率由72%提高到92%以上。
In order to obtain efficient synthetic aperture lidar signals, a method to improve the effective power of the laser chirp signal through precise control of the resonant cavity is proposed, and the implementation of the frequency modulation of the laser is described. First of all, the analysis of the drive signal to obtain its Fourier spectrum, learned that the effective power of the modulated signal is low due to the cavity modulator response to the higher harmonic signal is poor; by introducing the resonant cavity driver circuit higher harmonic response module , Which effectively reduces the falling edge of the FM waveform and increases the effective power of the synthetic aperture lidar signal. The performance of the obtained FM signal was tested. The results show that the FM bandwidth reaches 789 MHz when the FM period is 1 ms, and the useful power in the signal power is increased from 72% to over 92%.