Underwater acoustic communication method based on very minimum chirp keying modulation

A linear frequency modulation, keying modulation technology, applied in the field of digital communication, can solve the problem of not using underwater acoustic communication, and achieve the effects of great economic value and social benefits, high frequency band utilization, and fast information transmission rate

Inactive Publication Date: 2012-02-15
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are several existing ultra-narrowband modulation techniques: H.R.Walker first proposed Very Minimum Shift Keying (VMSK) in 1997, and then Wu Lenan proposed very small waveform difference ke

Method used

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  • Underwater acoustic communication method based on very minimum chirp keying modulation
  • Underwater acoustic communication method based on very minimum chirp keying modulation
  • Underwater acoustic communication method based on very minimum chirp keying modulation

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Experimental program
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Effect test

Embodiment 1

[0043] see image 3 , the underwater acoustic communication method based on very small chirp keying modulation, which is characterized in that the transmitting end uses the ultra-narrowband signal modulated by very small chirp keying as the transmission signal source to drive the underwater acoustic transducer to generate chirp longitudinal waves, Transmission in water; the receiving end converts the acoustic signal into an electrical signal through a transducer and then demodulates it.

Embodiment 2

[0045] This embodiment is basically the same as Embodiment 1, and more detailed descriptions are as follows:

[0046] Sending circuit:

[0047] 1) The data information is input into the FPGA, and the data storage and transmission module is controlled on the FPGA to send the waveform representing "0" or "1", and the D / A module converts the digital information output by the FPGA into an analog waveform to generate Up-Chirp and Down-Chirp Two VMCK signals.

[0048] The ultra-narrowband signal expression of VMCK is:

[0049] (5)

[0050] in, Represents the VMCK signal of one symbol, its expression is:

[0051] (6)

[0052] In the formula, or Indicates the up change or down change of the frequency of the VMCK signal, which is used to represent different transmission signals "1" (Up-chirp) or "0" (Down-chirp), respectively. Indicates the bit transfer rate, Represents the chirp coefficient, which reflects the frequency change degree of very sma...

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Abstract

The invention relates to an underwater acoustic communication method based on very minimum chirp keying modulation. The method comprises that: a transmitter drives an underwater acoustic transducer by using a very minimum chirp keying modulated ultra-narrowband signal as a transmission signal source to generate chirped longitudinal waves for transmission in water; and a receiver converts an acoustic signal into an electric signal for demodulation by the transducer. By the method, a frequency band utilization rate is extremely high. The communication method is applied to underwater acoustic communication and aims to explore a new technical path for the underwater acoustic communication, realize high-speed underwater acoustic information transmission and increase the frequency band utilization rate in a signal transmission process. The method is expected to be applied to future submarine military communication.

Description

technical field [0001] The invention belongs to the technical field of digital communication, in particular to an underwater acoustic communication method modulated by very small chirp keying. Background technique [0002] The attenuation of light waves and electromagnetic waves in water is extremely large. Even the blue-green light with the least attenuation has an attenuation degree of 40dB / km. Therefore, their propagation distance in seawater is very limited, which is far from meeting the needs of human ocean activities. For example, even with very low frequency (less than 10kHz) electromagnetic waves, coupled with megawatt-level transmission power and huge antennas, the penetration in seawater is no more than 100m, and the data transmission rate reaches 100b / s. At very low frequencies (below 200Hz), sound waves can travel hundreds of kilometers in the ocean, and even 20kHz sound waves have only 2-3dB / km attenuation in water, so underwater communications generally use sou...

Claims

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Application Information

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IPC IPC(8): H04L27/12H04B13/02
Inventor 刘雅君卢佳欣郑国莘骆钟频刘宇周倩怡谈莹戴胜辰
Owner SHANGHAI UNIV
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