用于激光回波信号模拟的脉宽-强度调制方式

Pulse Width-Intensity Modulation for Simulation of Laser Echo Signals

激光探测系统连接的功能模块能否正常工作,由探测系统对探测目标的识别能力决定。针对实验室条件下高速交会的目标回波信号的模拟,提出了脉宽-强度调制方式。该方式通过控制输入脉冲信号的脉宽改变输出光脉冲的峰值,可用于模拟回波信号的脉冲峰值变化。设计了电路实现形式,采用该电路驱动860 nm半导体激光器并进行测试。测试结果表明,脉宽为8~16 ns的输入脉冲信号对应峰值功率为3.7~8.3 W的输出光脉冲信号。将脉宽-强度调制模块作为基本的物理实现单元,提出了回波信号的高阶模拟方案,模拟目标回波信号更多的信息。该调制方式原理简单、电路实现容易且成本低,为激光探测系统的目标识别功能的设计与检验提供新的方向。

The ability of a detection system to recognize detection targets determines whether or not the functional modules connected to the laser detection system can work normally. A pulse width-intensity modulation scheme is proposed to simulate crossing target echo signals at high speed in the laboratory. This scheme can change the peak value of the output light pulse by controlling the pulse width of an input pulse signal and simulate the peak value changes of echo signals. In addition, the circuit implementation is designed to drive an 860 nm semiconductor laser for testing. The test results reveal that the input pulse signal with a pulse width of 8-16 ns corresponds to the output pulse signal with the peak power of 3. 7-8. 3 W. Taking the pulse width-intensity modulation module as the basic physical realization unit, we present a high-order simulation scheme of echo signals to simulate more information of target echo signals. This modulation method is simple in the principle, easy in circuit implementation, and low in costs, which provides a new direction for the design and inspection of the target recognition function of a laser detection system.