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A Photon Counting Lidar Based on True Random Coding

A technology of photon counting and laser radar, which is applied to the re-radiation of electromagnetic waves, instruments, and measuring devices, can solve problems such as difficult engineering applications, low practicability, and poor ranging performance, so as to reduce measurement time and improve correlation , Improve the effect of ranging ability

Active Publication Date: 2022-07-19
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention aims to solve the problems that the traditional pseudo-random coded photon counting laser radar is limited by expensive signal generators, and is affected by the dead time of the detector, the ranging performance is poor, the practicability is not high, and the engineering application is difficult. For the first time, the Geiger As a true random signal generator, the mode avalanche photodetector not only reduces the cost and reduces the cost, but more importantly, the interval between any two '1' symbols generated by the Geiger mode photodetector is greater than that of the detector Dead time, therefore, cleverly solves the problem of poor ranging performance of traditional pseudo-randomly coded photon counting lidars affected by detector dead time

Method used

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  • A Photon Counting Lidar Based on True Random Coding
  • A Photon Counting Lidar Based on True Random Coding
  • A Photon Counting Lidar Based on True Random Coding

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specific Embodiment approach 1

[0019] Specific implementation mode 1: see figure 1 This embodiment will be described. The photon counting lidar with true random encoding described in this embodiment includes a first Geiger mode avalanche photodiode 1, a pulse shaping circuit 2, a laser 3, an optical system 4, a second Geiger mode Mode avalanche photodiode 5, external clock 6, photon counting module 7 and signal processing module 8; the first Geiger mode avalanche photodiode 1 responds to thermal noise or background light noise, and its output is connected to the pulse shaping circuit. The input terminals are connected, and the pulse shaping circuit 2 shapes the electrical pulses to obtain a random sequence of narrow pulses. One of its output terminals is connected to the first channel of the photon counting module 7 to obtain the reference template a(n) of the random sequence, and the other The output end is connected to the input end of the laser 3. The laser 3 receives the electrical pulses from the pulse...

specific Embodiment approach 2

[0020] Embodiment 2: The difference between this embodiment and the photon-counting lidar with random encoding described in Embodiment 1 is that the specific process of generating a real machine code sequence is as follows:

[0021] When the first Geiger mode avalanche photodiode 1 is powered on, due to the thermal noise of the detector itself, even in the dark room, there will be pulses, which are called dark counts, and the number of dark counts is the same as that of the first Geiger mode avalanche. The operating temperature of the photodiode is related. At the same time, the first Geiger mode avalanche photodiode 1 also responds to the incident background light. Through the response to dark noise and background light noise, the final periodic output pulse random sequence. The periodic output of the pulse sequence is mainly realized by adding a gate control circuit to the first Geiger mode avalanche photodiode 1. The first Geiger mode avalanche photodiode 1 is in an enable...

specific Embodiment approach 3

[0022] Embodiment 3: The difference between this embodiment and the photon counting lidar with true random encoding described in Embodiment 2 is that the photon counting lidar system with true random encoding described in Embodiment 3 implements specific ranging. The process is:

[0023] The laser 3 receives the electrical pulse sequence generated from the second embodiment, modulates the continuous laser light into a random optical pulse sequence according to the input random electrical pulse sequence, and the output optical pulse sequence is irradiated to the target through the optical system 4, and is scattered by the target. A part of the laser echo signal will be returned to the optical system 4, and sent to the second Geiger mode avalanche photodiode 5 through the optical system 4, and the second Geiger mode avalanche photodiode 5 will output electrical pulses in response to the laser echo signal, and The electrical pulse signal of the second Geiger mode avalanche photod...

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Abstract

The invention discloses a photon counting laser radar based on true random coding, which belongs to the technical field of laser radar. True random coding greatly reduces the size and cost of the system, and overcomes the dead time of the detector to measure the distance of the system while retaining the advantages of the traditional pseudo-random coding photon counting lidar system with low transmit power, fast imaging speed, and overcoming distance ambiguity. At the same time, the true random encoding photon counting lidar system has extremely high anti-crosstalk ability. The radar mainly includes two Geiger mode avalanche photodiodes, pulse shaping circuits, lasers, optical systems, external clocks, photon counting modules, and signal processing modules. Replacing the traditional signal generator with a single photon detector greatly improves the practical value of the system, and is widely used in the field of target ranging and imaging.

Description

technical field [0001] The invention relates to the technical field of laser radar, in particular to a photon counting laser radar based on true random coding. Background technique [0002] The photon counting lidar with true random coding uses a Geiger mode avalanche photodiode as a detector, which has single-photon detection capability and can measure long-distance weak signal targets. It can improve the signal-to-noise ratio of the radar signal. On the other hand, the target distance can be obtained in one detection without multiple accumulation, which greatly reduces the imaging time and can detect high dynamic targets. Therefore, it has attracted the attention of researchers and has become a Research hotspots in the field of lidar. However, the photon counting lidar system of the common encoding method uses a signal generator to generate the required encoded signal, and this method has two disadvantages. First, the symbol width corresponding to the required coded sign...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/14G01S7/487
CPCG01S17/10G01S7/487
Inventor 于洋刘博陈臻王华闯
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI