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.
Geiger mode avalanche photodiode arrays(G-APDs) is emerging high-sensitivity laser signal detectors in recent years, which can be applied to photon-level lidar detection, guidance and imaging. Because of its photon-level detection sensitivity, it is greatly affected by the strong skylight background and its own dark count. In order to reduce the noise interference such as dark count and strong skylight background, based on the detection techniques such as spectral filtering, spatial filtering and temporal filtering, a noise filtering technique based on neighboring pixel threshold detection is proposed. Through modeling analysis and related experiments, it is verified that the noise filtering technique based on neighboring pixel threshold detection can effectively improve the detection probability and ranging accuracy of laser single-pulse echo signals.
KEYWORDS: Sensors, Signal to noise ratio, Signal detection, Interference (communication), Neodymium, Electrons, Fiber couplers, Signal attenuation, Optical filters, Beam splitters
Study the noise by detectors and background light ,we find that the influence of background noise on the detection is more than that of itself. Therefore, base on the fiber coupled beam splitting technique, the small area detector is used to replace the large area detector. It can achieve high signal-to-noise ratio (SNR) and reduce the speckle interference of the background light. This technique is expected to solve the bottleneck of large field of view and high sensitivity.
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