Remote laser distance measuring system based on high-speed pseudo-random code modulation and photon counting

A pseudo-random code and photon counting technology, applied in the field of long-distance laser ranging systems, can solve the problems of high coherence requirements of emitting laser light sources, low range resolution and ranging accuracy, and increased system volume and power consumption. Improve detection density, compact structure, and high SNR

Inactive Publication Date: 2013-02-13
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

The laser works at high peak power and high energy for a long time, which will reduce the stability of the system and increase the size and power consumption of the system
In order to avoid distance ambiguity, the system can only work at low repetition frequency, resulting in sparse measurement points and low distance resolution.
Compared with the direct distance measurement method, the phase measurement method has a complex structure and higher requirements for the coheren...

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  • Remote laser distance measuring system based on high-speed pseudo-random code modulation and photon counting

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with example and accompanying drawing, but should not limit protection scope of the present invention with this.

[0027] The schematic diagram of the entire long-range laser ranging system based on high-speed pseudo-random code modulation and photon counting is shown in figure 1 As shown, it can be seen from the figure that the remote laser ranging system based on high-speed pseudo-random code modulation and photon counting in the present invention includes a seed light source 1, a pseudo-random code generator 2, a pseudo-random code modulator 3, an optical fiber amplification system 4, and a transmitting telescope 5. 45° total reflection mirror group 6, optical filter 7, receiving telescope 8, single photon detector 9, photon counting card 10, computer 11. The specific working process is: the seed light source 1 is connected to the pseudo-random code modulator 3, and the pseudo-random code generator ...

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Abstract

The invention provides a remote laser distance measuring system based on high-speed pseudo-random code modulation and photon counting. A basic principle is as follows: a high-speed pseudo-random code is used for modulating continuous optical fiber laser; modulated signal light is emitted through a transmitter-telescope system; and target reflection light is received by the transmitter-telescope system and enters a single-photon detector. A photon counting card is used for carrying out pulse identification and threshold value judgment on a signal output by the detector to obtain an echo code element sequence; and distance information is obtained by carrying out related calculation on an original pseudo-random code sequence. The remote laser distance measuring system has the characteristics of realizing high repetition frequency and high precision remote laser distance measurement.

Description

technical field [0001] The invention relates to laser radar, which is a long-distance laser ranging system based on high-speed pseudo-random code modulation and photon counting. Background technique [0002] At present, the commonly used laser ranging methods mainly include time-of-flight pulse direct ranging method and phase measurement method. The pulse direct ranging method based on time-of-flight is the most widely used. The ranging principle is to obtain distance information by measuring the time interval between the transmitter and the measurement point. This method is simple to implement, but the ranging accuracy is low. When this method is used for long-range laser ranging, high peak power, narrow-pulse solid-state lasers and large-aperture receiving telescopes are usually used. The laser works at high peak power and high energy for a long time, which will reduce the stability of the system and increase the volume and power consumption of the system. In order to a...

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Application Information

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IPC IPC(8): G01S11/12
Inventor 杨芳陈卫标张鑫贺岩
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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