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提出了一种四Gm-APD单次探测的激光雷达系统,该系统采用2×2的光纤阵列同时接收回波脉冲,利用四通道实时比对得到目标的距离信息。计算了该系统探测概率、虚警概率和测距精度,并与传统单Gm-APD四次累积探测激光雷达系统进行相互比较。结果表明,四Gm-APD激光雷达系统不仅能够使探测速度提高到4倍,其探测性能也都明显优于单Gm-APD四次累积探测的激光雷达。探测概率从60.6%提高到了91.6%,虚警概率从1.9%下降到了0.2%,测距精度从1.771 m提高到了0.440 m。最后,分别对两个系统进行了64×64像素的距离像仿真,仿真结果验证了该方法的正确性。
A four-Gm-APD single-probe Lidar system is proposed. The system uses a 2 × 2 fiber array to receive echo pulses at the same time, and uses the four-channel real-time alignment to obtain the target distance information. The detection probabilities, false alarm probabilities and ranging accuracy of the system are calculated and compared with the traditional single Gm-APD quadrupole detection Lidar system. The results show that the four-Gm-APD laser radar system can not only improve the detection speed by 4 times, but also have better detection performance than the lidar with 4 times cumulative detection of single Gm-APD. The probability of detection increased from 60.6% to 91.6%, the probability of false alarm dropped from 1.9% to 0.2%, and the ranging accuracy increased from 1.771 m to 0.440 m. Finally, the distance simulation of 64 × 64 pixels was carried out on the two systems respectively. The simulation results verify the correctness of the method.