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在相位式激光测距中，接收光功率的大小直接决定了测量信噪比，从而决定了测量范围和测量精度，因此如何准确地计算出接收光功率的大小，是测距技术中一个非常重要的问题。对普遍使用的计算接收光功率公式的适用范围进行了讨论，指出了其不适用于非合作目标短距离测量的原因。提出了适于非合作目标相位式激光测距的计算接收光功率的新方法，推导了计算公式，并进行了仿真计算。
In the phase laser rangefinder, the size of the received optical power directly determines the measurement signal to noise ratio, which determines the measurement range and measurement accuracy, so how to accurately calculate the size of the received optical power is a very important technology in ranging The problem. The application of the commonly used method for calculating the received optical power is discussed, and the reason why it is unsuitable for short-range non-cooperative target measurement is pointed out. A new method of calculating received optical power which is suitable for non-cooperative target phase laser ranging is proposed. The calculation formula is deduced and the simulation calculation is carried out.