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介绍了基于连续波调制的激光雷达探测原理;通过分析激光传输的能量转换过程,按照激光器光强调制输出、空间传输与目标反射、光电探测器接收和电混频过程建立了FM/CW激光雷达方程;基于系统的探测概率、虚警概率和信噪比的关系确定了发射功率的表达式,得到了影响发射功率的主要因素;在满足系统器件参数和应用背景下对发射功率进行了仿真,并分析了混频效率和调制深度对发射功率的影响。仿真结果表明:通过提高混频效率和调制深度可以降低系统对发射功率的要求,能够尽可能地实现系统最优化,较好地解决了激光雷达设计时对激光器发射功率确定的问题。
The principle of laser radar detection based on CW modulation is introduced. By analyzing the energy conversion process of laser transmission, the FM / CW laser radar is established based on the laser intensity modulation output, spatial transmission and target reflection, photodetector reception and electrical mixing process Based on the relationship between probing probability, false alarm probability and signal-to-noise ratio of the system, the expression of transmit power is determined and the main factors affecting the transmit power are obtained. The transmit power is simulated under the condition of meeting the system parameters and application. The influence of mixing efficiency and modulation depth on transmitting power is analyzed. The simulation results show that the system can reduce the system transmit power by increasing the mixing efficiency and modulation depth, and can optimize the system as much as possible, which solves the problem of determining the laser transmit power when designing the laser radar.