A recovery method for time-intensity information of single photon detection

Abstract

The invention discloses a method for recovering single-photon detection time-intensity information, which includes: cumulatively averaging the number of photons obtained by multiple detections; and counting the number of background photon noises detected by the first x detection time interval units within the detection distance gate. Carry out averaging; Calculate the first estimated value of the total number of echo photons received in the detection range gate; Calculate the second estimated value of the total number of echo photons received in the detection range gate; Perform the first estimated value and the second estimated value weighted summation; obtain the initial estimated value of the echo intensity distribution probability; perform recovery iterative estimation on the number of echo photons received in each detection time interval unit in the detection range gate; and calculate the total number of echo photons in the detection range gate; Judging whether the total number of echo photons in the range gate is between the first threshold and the second threshold; obtaining a time-intensity probability distribution function of the recovered signal. The invention can recover the depth echo information of the target during single photon detection.

Description

technical field [0001] The invention belongs to the technical field of laser radar, and in particular relates to a method for recovering single-photon detection time-intensity information. Background technique [0002] Single-photon lidar has the advantages of high detection sensitivity and long effective range, and has achieved considerable development in recent years. At present, the main problems of single-photon lidar in the acquisition of target information are: [0003] (1) The first photon imaging mode is mainly adopted when acquiring target information, that is, the target distance information is determined by recording the arrival time of the first echo photon of the target, and then imaging is realized. When detecting a deep target, the target echo signal shows an intensity distribution along the time dimension, and the target depth information cannot be obtained only by first photon imaging. In addition, due to noise and the random effect of echo photons, random...

AI Technical Summary

Problems solved by technology

When detecting a deep target, the target echo signal shows an intensity distribution along the time dimension, and the target depth information cannot be obtained only through the first photon imaging

In addition, due to noise and echo photon randomness effects, the trigger time of the first photon is randomly jittered, which affects the accurate measurement of the target distance

[0004] (2) The time-varying information of the number of echo photons can be obtained by accumulating multiple photon counting signals, but due to the influence of the dead time of the single-photon detector, the direct accumulation signal will be distorted and cannot reflect the accurate time of the target echo- Intensity change information, it is difficult to accurately advance the target depth information on this basis

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