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Infrared chaotic laser secret communication method in free space and communication system thereof

A chaotic laser and free space technology, applied in the direction of secure communication through chaotic signals, free space transmission, optical transmission system, etc., can solve the problems of large weather influence and limited information demodulation quality, and achieve high quality and safe demodulation information The effect of high-speed information bearing

Pending Publication Date: 2021-08-13
TAIYUAN UNIV OF TECH
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Problems solved by technology

At present, chaotic lasers in the bands of 0.7 μm and 1.5 μm are greatly affected by the weather when transmitting in free space, and the quality of information demodulation is limited

Method used

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  • Infrared chaotic laser secret communication method in free space and communication system thereof

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Embodiment Construction

[0035] like figure 1 As shown, a method for secure communication of infrared chaotic laser in free space of the present invention comprises the following steps:

[0036] Step 1: Generate broadband chaotic laser C by emitting laser T (t);

[0037] Step 2: Modulate the digital signal m(t) onto the current of the information-loaded laser to obtain the mid-infrared light signal m(t);

[0038] Step 3: Through unidirectional injection, the receiving laser and the transmitting laser output synchronously, and the chaotic laser output by the receiving laser is C R (t);

[0039] Step 4: Cover the mid-infrared light signal m(t) in the chaotic laser C T In (t), it is transmitted to the receiving end through the atmospheric channel, and the receiving laser uses chaotic filtering to demodulate the information, and the recovered information obtained is m’(t) = C T (t)+ m(t)-C R (t), realizing free-space chaotic laser secure communication.

[0040] In the step one, the broadband chaoti...

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Abstract

The invention discloses an infrared chaotic laser secret communication method in a free space and a communication system thereof, and belongs to the technical field of chaotic laser secret communication. The technical problem to be solved is to provide the improvement of the infrared chaotic laser secret communication method in the free space. According to the technical scheme, the method comprises the following steps that broadband chaotic laser CT (t) is generated through a transmitting laser; a digital signal m (t) is modulated to the current of an information loading laser to obtain a mid-infrared light signal m (t); a receiving laser and the transmitting laser output synchronously through one-way injection, wherein the chaotic laser output by the receiving laser is CR (t); a mid-infrared light signal m (t) is hidden in chaotic laser CT (t) and transmitted to a receiving end through an atmospheric channel, chaotic filtering is used for information demodulation at the receiving laser, obtained recovery information is m '(t)=CT (t)+m (t)-CR (t), and free space chaotic laser secret communication is achieved. The invention is applied to secret communication.

Description

technical field [0001] The invention discloses a free-space mid-infrared chaotic laser secure communication method and a communication system thereof, belonging to the technical field of free-space mid-infrared chaotic laser secure communication. Background technique [0002] Ground battlefield mobile command communications based on free-space laser communications require extremely high security, but unprotected information transmission and open communication channels may cause signal eavesdropping without interrupting communications, resulting in information security threats. As the first layer of protection to ensure information security, the security of information transmission is particularly important. [0003] Chaos security is a promising high-speed information encryption technology, which can be used for laser security transmission in free space. At present, the bottleneck restricting the development of free-space chaotic optical communication is the lack of broadba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/11H04B10/85H04L9/00
CPCH04B10/11H04B10/85H04L9/001
Inventor 韩红程旭敏李丽贾志伟常朋发张建国王安帮
Owner TAIYUAN UNIV OF TECH
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