Laser interception device based on correlation detection technology

Abstract

The invention provides a laser interception device based on a correlation detection technology. The laser interception device based on the correlation detection technology comprises a focusing mirror, a modulation laser signal emission source, a modulation signal generator, a filter lens, a laser signal receiver, a correlation detector, a power amplifier and a loudspeaker, wherein an output end of the modulation signal generator is connected with the modulation laser signal emission source and provides laser modulation signals, the modulation laser signal emission source generates and emits modulation laser signals according to the laser modulation signals, the other output end of the modulation signal generator is connected with an input end of the correlation detector; the laser signal receiver receives reflected laser signals, the reflected laser signals are pre-processed and then input to the other input end of the correlation detector, an output end of the correlation detector is connected with an input end of the power amplifier, and an output end of the power amplifier is connected with the loudspeaker. By means of the laser interception device based on the correlation detection technology, the influence of external environment factors on the interception device can be remarkably reduced, the dynamic range of the receiver can be increased, the signal to noise ratio of interception signals can be increased, and audio interception effects are improved.

Description

technical field [0001] The present invention relates to the technical field of interception equipment, in particular to a laser interception equipment. Background technique [0002] Voice communication is a direct, effective and credible way of information transmission. Voice interception is an important way to obtain information about the object of concern, and it is also an important source of various intelligence. It is used in criminal investigation, military, public safety and national security. And many other fields have a wide range of applications. Sound is transmitted outward through the vibration of the air, and the sound wave will cause the vibration of the surrounding obstructions. Therefore, the laser signal is used to detect the vibration caused by the sound wave, and the sound restoration can be realized. Laser itself also has the advantages of good directionality, slow attenuation, and long propagation distance. Therefore, as an emerging non-contact and trac...

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Problems solved by technology

[0005] The present invention aims to overcome the disadvantages of existing laser interception devices such as being easily affected by the environment, high noise, and poor practicability, and proposes a laser interception device that is less affected by the environmental optical background, has a high signal-to-noise ratio, and has a good interception effect

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