Photon counting laser radar 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 low practicability, difficult engineering application, and poor ranging performance, so as to improve correlation and reduce measurement time , Improve the effect of ranging ability

Active Publication Date: 2019-08-23
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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  • 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

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  • Photon counting laser radar based on true random coding

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specific Embodiment approach 1

[0019] Specific implementation mode one: see figure 1 Describe this embodiment mode, a photon counting laser radar with true random coding described in this embodiment mode, it 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 terminal 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 puls...

specific Embodiment approach 2

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

[0021] When the first Geiger mode avalanche photodiode 1 is energized, due to the thermal noise of the detector itself, there will be pulses even in the case of a dark room, which is called dark count, and the number of dark counts is the same as that of the first Geiger mode avalanche The operating temperature of the photodiode is dependent. 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 gating circuit to the first Geiger mode avalanche photodiode 1. The high level of the first Geiger mode avalanche photodiode...

specific Embodiment approach 3

[0022] Specific embodiment three: the difference between this embodiment and the photon counting laser radar with true random coding described in specific embodiment two is that the photon counting laser radar system with true random coding described in specific embodiment three realizes specific ranging The process is:

[0023] The laser 3 receives the electric pulse sequence generated in the second embodiment, modulates the continuous laser light into a random light pulse sequence according to the input random electric pulse sequence, and the output light pulse sequence irradiates the target through the optical system 4, and is scattered by the target Part of the laser echo signal will return to the optical system 4, and then transmitted to the second Geiger mode avalanche photodiode 5 through the optical system 4, and the second Geiger mode avalanche photodiode 5 responds to the laser echo signal by outputting an electric pulse, and The electrical pulse signal of the second...

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Abstract

The invention discloses a photon counting laser radar based on true random coding, and belongs to the technical field of the laser radar. The true random coding greatly reduces the system volume and cost and overcomes the influence on the system ranging performance by the detector dead time while reserving the advantage that the traditional pseudo random coding photon counting laser radar system is low in transmitting power, fast in imaging speed and capable of overcoming distance ambiguity, and the true random coding photon counting laser radar system has extremely high crosstalk-resisting capacity. The radar mainly comprises two avalanche photodiodes in Geiger model, a pulse shaping circuit, a laser device, an optical system, an external clock, a photon counting module, and a signal processing module. The traditional signal generator is replaced with the single-photon detector, the practical value of the system is greatly improved, and the laser radar is extensively applied to the target ranging and imaging field.

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 truly random coded photon counting lidar 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 accumulations, which greatly reduces the imaging time and can detect high-dynamic targets. Therefore, it has attracted the attention of scientific researchers and has become Research hotspots in the field of lidar. However, the photon counting laser radar system of the common coding method uses a signal generator to generate the required coding signal, and this method has two disadvantages. First of all, the symbol width corresponding to the requ...

Claims

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Application Information

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