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Terahertz frequency band atmospheric transmission characteristic library building method for signal distortion compensation

A technology of atmospheric transmission and signal distortion, which is applied in database indexing, scattering propagation systems, special data processing applications, etc. It can solve the problems of manpower and material resources, difficulty in selecting and assigning variable parameters in database time, and achieve the effect of compensating distorted signals.

Active Publication Date: 2021-04-09
BEIHANG UNIV
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Problems solved by technology

[0016] Due to the changeable atmospheric conditions, there is a large difference between the atmospheric conditions during the actual measurement and the atmospheric conditions during the experimental test, so it is difficult to select and assign variable parameters when establishing a database
In addition, because there are many combinations of variables in the database, it is both manpower and resource-intensive and unnecessary to conduct measurement experiments for each variable combination.

Method used

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  • Terahertz frequency band atmospheric transmission characteristic library building method for signal distortion compensation
  • Terahertz frequency band atmospheric transmission characteristic library building method for signal distortion compensation
  • Terahertz frequency band atmospheric transmission characteristic library building method for signal distortion compensation

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0048] The block diagram of a method for building a database of atmospheric transmission characteristics in the terahertz frequency band for signal distortion compensation of the present invention is as follows figure 1 As shown, the specific steps are as follows:

[0049] Step 1: Deduce the calculation formula of atmospheric absorption and phase shift coefficient.

[0050] After the terahertz pulse is transmitted through the atmosphere, it can be expressed in the frequency domain as:

[0051] E(f,l)=E(f,0)·exp[-α(f)l]·exp[iβ(f)l] (1)

[0052] In the formula, E represents the terahertz pulse; f is the frequency; l is the transmission distance; i is the imaginary number symbol; α is the amplitude attenuation coefficient; β is the phase shift coefficient.

[0053] It can be seen from formula (1) that the influence of atmospheric transmission ...

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Abstract

The invention discloses a terahertz frequency band atmospheric transmission characteristic library building method for signal distortion compensation, and solves the problem of terahertz signal atmospheric transmission distortion compensation. The method comprises the following steps: deriving a terahertz frequency band gas absorption and phase shift coefficient calculation formula according to an atmospheric transmission theory; calculating terahertz frequency band absorption and phase shift coefficients of different gas components under the same atmospheric condition by utilizing a formula, and determining main contribution components; analyzing the relationship between the meteorological condition and the atmospheric component parameter, and determining a database variable; finally, selecting a variable combination to calculate atmospheric absorption and phase shift coefficients, and establishing a database. The method has the advantages that universality is achieved, and distortion signals are compensated through a database matching search method and are not limited by atmospheric conditions during measurement; atmospheric condition parameter inversion can be realized by matching a theoretical curve and an actual measurement curve, and then distortion signals are compensated.

Description

technical field [0001] The invention relates to the fields of atmospheric transmission characteristic calculation and atmospheric transmission compensation, in particular to a method for building a terahertz frequency band atmospheric transmission characteristic database for signal distortion compensation. Background technique [0002] The terahertz frequency band usually refers to the frequency range of 0.1-10THz. Compared with the microwave frequency band system, the terahertz frequency band system can use a wider bandwidth. Therefore, in theory, the channel capacity of the terahertz wireless communication system is much larger than that of the existing communication system, and the terahertz radar imaging system can use a wider bandwidth to generate a high-resolution one-dimensional range image. [0003] However, terahertz signals are more easily affected by gas molecules and suspended particles in the atmosphere, and amplitude attenuation and phase shift occur after bein...

Claims

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Application Information

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IPC IPC(8): G06F16/22H04B7/22
CPCG06F16/2291H04B7/22
Inventor 何晓雨许小剑
Owner BEIHANG UNIV
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