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.
The total impulse of the disc type laser ablation thruster is linearly related to the number of ablation points on the target plate and improving the utilization rate of the target plate is beneficial to obtain more ablation points on the limited target plate surface. In this paper, the structure of the laser ablation micro-thruster was designed, two ablation paths for thruster were put forward and analyzed, namely the circle path and the spiral path. The distribution of the ablation point on the target plate was theoretically modeled. Through calculation, the influence law on the utilization rate of the target plate by the size of the target plate and the size of the ablation point under the two paths is analyzed and compared. The results show that, the target utilization theory of circle path and spiral path can reach up to 78.54%; The research in this paper provides theoretical guidance and design reference for the utilization of the target plate of the disc laser ablation thruster.
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