In order to realize the weak signal accurate imaging of ultra-long range target, a single photon detection imaging system is established. The detection technology of neighborhood second-order spatiotemporal correlation is proposed, and the detection probability and false alarm probability of neighborhood second-order spatiotemporal correlation algorithm are analyzed. The simulation analysis of the neighborhood second-order spatiotemporal correlation algorithm shows that for more than 90% detection success rate, the average photon number required by the conventional method is 0.77, which is reduced to 0.0375. The results show that it can basically meet the requirements of high imaging accuracy, low false alarm rate and fast imaging speed for ultra-long range targets.
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