Laser signal recovery module, multipoint alignment underwater laser communication system and multipoint alignment underwater laser communication method

Abstract

The invention discloses a laser signal recovery module, a multipoint alignment underwater laser communication system and a multipoint alignment underwater laser communication method. A complex underwater environment is a main factor influencing underwater laser communication distance and bit error rate. The laser signal recovery module comprises a DAC circuit, a voltage-controlled amplification circuit, an ADC sampling circuit, a pulse peak holding circuit, an autocorrelation circuit and an adjustable threshold comparator circuit, wherein the DAC circuit, the voltage-controlled amplification circuit, the ADC sampling circuit and the pulse peak holding circuit form an automatic gain control circuit; laser signals subjected to water attenuation and scattering interference are recovered through a signal conditioning technology, so that a relatively high communication rate is achieved under a longer communication distance, and a technical guarantee is provided for underwater wireless videotransmission and other applications. According to the laser signal recovery module disclosed in the invention, automatic alignment of any two underwater laser communication systems is realized by using the holder, and therefore laser communication among a plurality of spatially separated underwater targets can be realized.

Description

technical field [0001] The invention belongs to the technical field of underwater wireless communication, and in particular relates to a laser signal recovery module, an underwater laser communication system and method for multi-point alignment. Background technique [0002] Wireless communication technologies generally include microwave communication, acoustic communication, and optical communication. Due to the large attenuation of microwave in water, it is not suitable for underwater wireless communication; underwater acoustic communication is currently widely used in the field of underwater wireless communication, and the transmission distance is long, but there are slow transmission rate, poor anti-interference performance, and poor performance. However, it is difficult to meet the high-speed data transmission requirements in current ocean exploration. Underwater wireless optical communication is an emerging underwater wireless communication technology. The light source...

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Problems solved by technology

In addition, when the received signal is too strong, the bit error rate will also be affected by the signal pulse broadening, so the gain will be reduced when the signal is too strong

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