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 engine plume is a kind of high-temperature, high-pressure gas, which emits a strong infrared signal, and is widely used in target detection and recognition. This paper takes a liquid rocket engine as the research object, and uses the unsteady Navier-Stokes equation to simulate the working process from engine ignition to stable combustion. Based on the calculation results of plume flow field, the infrared radiation characteristics of the unsteady working process are calculated by the line-by-line integration method and the light of sight method. The time scale of the engine from ignition to stable combustion is very small, and at the same time, the radiation brightness distribution and the radiation intensity distribution in the process are given.
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