Single-photon detection-based multi-phase pseudorandom sequence quick generation and decoding method

A pseudo-random sequence and single-photon detection technology, which is applied in the field of rapid generation and decoding of multi-phase pseudo-random sequences, can solve problems such as rate mismatch and fixed encoding form, and achieve the effect of improving computing speed, improving system performance, and being easy to produce.

Active Publication Date: 2018-03-13
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI +1
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Problems solved by technology

[0009] In order to solve the problems such as the rate mismatch between the code generation rate and the laser repetition rate caused by high-speed code modulation in single-photon detection, and the code form is fixed, the present invention proposes a multi-phase pseudo-random sequence based on single-photon detection. Decoding method, the pseudo-random sequence produced by the present invention also has multiple advantages such as being able to obtain any code pattern, carrying strength information (polyphase sequence), good autocorrelation, and easy generation

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  • Single-photon detection-based multi-phase pseudorandom sequence quick generation and decoding method

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[0051] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the bold symbols in the specification represent vectors.

[0052] Such as figure 1 , the pseudo-random sequence of the present invention is quickly generated by the following:

[0053] Step 1: Set the pseudo-random sequence length L according to the parameters of the single-photon detection system S , the proportion of modulation position P, the intensity series i and its division interval (T 1 , T 2 ),(T 2 , T 3 ),…(T i-1 , T i ) and the buffer bit buff used for laser energy storage time;

[0054] Step 2: Set the parameters of the Mersenne Twister algorithm: codeword length w, recursion degree n, intermediate value m, codeword cutting point r, initialization parameter f, and rotation linear shift feedback register tempering bit mask and tempering displacement b, c , s, t, u, d, l;

[0055] Step 3: Set a w-bit long...

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Abstract

The invention discloses a single-photon detection-based multi-phase pseudorandom sequence quick generation and decoding method. The method mainly comprises the following steps of firstly generating ahigh-quality random number through a Mersenne Twister algorithm, and according to the generated random number and a preset threshold, judging a value of a bit to obtain a modulation position; and if the bit is the modulation position, jointly determining the value of the bit according to a preset intensity division interval and the generated random number, thereby obtaining intensity coding information. When one modulation position occurs, multiple later bits need to be crossed and the step is repeated to ensure that a laser device has sufficient energy storage time. A generated pseudorandom sequence is related to a received pseudorandom sequence, thereby calculating out a target distance. The method solves the problem of mismatch of high-speed modulation and a repetition frequency of thelaser device in single-photon detection, can realize coding of any code pattern and has the advantages of good autocorrelation, good noise suppression capability and the like.

Description

technical field [0001] The invention belongs to the technical field of laser radar, in particular relates to the field of extremely weak light detection, and specifically relates to a method for rapidly generating and decoding multi-phase pseudo-random sequences based on single-photon detection. Background technique [0002] Single-photon detection can detect long-distance non-cooperative targets under the condition of extremely low energy (the average energy of each pulse echo is less than one photon), and obtain high-precision ranging results. It greatly improves the performance of the lidar system under limited resources, and is a cutting-edge technology in the field of lidar. [0003] In order to quickly obtain target information, system designers often use high-repetition-frequency lasers. However, high repetition-frequency lasers cannot distinguish the correspondence between echo signals and transmitted signals during long-distance ranging, that is, they do not meet th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/14G01J11/00
Inventor 郝伟陈松懋苏秀琴李哲汪书潮朱文华张占鹏夏爱利
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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