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Laser link loss calculating method under complex weather

A technology of link loss, calculation method, applied in electrical components, electromagnetic wave transmission systems, transmission systems, etc.

Inactive Publication Date: 2012-07-11
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these algorithmic models or computing software, which separate the issues and discuss them one by one, are often only used as an auxiliary tool.

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  • Laser link loss calculating method under complex weather
  • Laser link loss calculating method under complex weather
  • Laser link loss calculating method under complex weather

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Embodiment 1, take light rain as an example.

[0073] Calculate the attenuation factor:

[0074] Choose a laser with a wavelength of 488nm (because the attenuation of rain is not greatly disturbed by the wavelength, you can also choose lasers with other wavelengths), refer to the meteorological data, take the rain speed of light rain as 2.5mm / h, and substitute it into the attenuation coefficient model The value of the attenuation coefficient obtained is 1.26km -1 .

[0075] Calculate power loss:

[0076] Substituting the attenuation value into the power loss model per kilometer L(λ)=10lgexp(-μ(λ))dB / km, the loss at this time is 5.49dB / km, because the cloud layer height in light rain weather is usually 1km , so after multiplying this attenuation distance, the power loss value in light rain is 5.49dB.

[0077] In addition, the cloud type in light rainy weather is usually stratocumulus, with a thickness of about 100m, and its attenuation coefficient is 0.045m -1 Also...

Embodiment 2

[0079] Embodiment 2, taking heavy fog as an example.

[0080] Calculate the attenuation factor:

[0081] Choose a laser with a wavelength of 488nm, the visibility V b The upper limit of the foggy weather is 200m, and the calculation formula of the attenuation coefficient of the fog is Among them, the value of A is 2.21, and the attenuation coefficient in heavy fog is 11.05km -1 .

[0082] Calculate power loss:

[0083] Substituting the attenuation value into the power loss model per kilometer L(λ)=10lgexp(-μ(λ))dB / km, the loss at this time is 47.99dB / km, if the thickness of the fog is 1km at this time, then get The power loss value in foggy weather is 47.99dB. At this time, if the attenuation of the cloud layer is further considered, the power attenuation value of the corresponding cloud layer can also be superimposed. Obviously, compared with the light rain before, the communication conditions in the foggy weather are much worse.

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Abstract

The invention discloses a laser communication link loss calculating method under complex weather conditions. The method comprises the following steps of: establishing a simplified laser signal transmission model; establishing attenuation models under various weather conditions; establishing a power loss model; establishing a signal-to-noise ratio (SNR) model; establishing a bit error ratio (BER) model; calculating power loss value analysis results; calculating SNR value analysis results; calculating BER value analysis results; making a data table; and comparing power allowance. According to the method, a series of models of transmission, attenuation coefficient, power loss, SNR, BER and the like are applied, the power loss model, the SNR model, the BER model and the transmission model are systematically combined together by fully using parameters associated with the attenuation coefficient, and typical weather conditions defined and divided by the meteorology are introduced, so that the aims of quantitatively analyzing the losses of power, SNR, BER and the like of laser communication under the specific weather conditions and even intuitively judging whether the link is smooth are fulfilled.

Description

technical field [0001] The invention belongs to the field of wireless communication, in particular to a method for calculating laser link loss under complex weather conditions. Background technique [0002] With the improvement of people's requirements for wireless communication transmission rate and the increasingly tight spectrum resources, microwave communication has been difficult to meet people's needs, which urgently requires the emergence of a new wireless communication method. Wireless laser communication combines the advantages of microwave communication and optical communication. It has the advantages of high bandwidth, high confidentiality, and low power consumption. It transmits with light waves with a frequency of hundreds of THz. The communication rate is as high as 10Gb / s, and it does not occupy traditional spectrum resources. , has a good application prospect. Countries are paying more and more attention to it, and more and more research scholars are devotin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/08H04B10/07
Inventor 宋琳刘海燕刘春玲陈波钟雷
Owner DALIAN UNIV
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