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Maximum usable frequency calculating method for shortwave links during ionospheric storms

A frequency calculation, ionospheric technology, applied in electrical components, transmission monitoring, transmission systems, etc., can solve problems such as lack of regular understanding

Active Publication Date: 2018-04-13
中国电波传播研究所
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Problems solved by technology

[0004] It can be seen that in the prior art, there is still a lack of regular understanding of the change characteristics and predictability of ionospheric parameters during ionospheric storms, as well as the changes in shortwave link parameters caused by them

Method used

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  • Maximum usable frequency calculating method for shortwave links during ionospheric storms
  • Maximum usable frequency calculating method for shortwave links during ionospheric storms
  • Maximum usable frequency calculating method for shortwave links during ionospheric storms

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Embodiment 1

[0042] Example 1, such as figure 2 As shown, this embodiment discloses a method for calculating the highest available frequency of a shortwave link during an ionospheric storm, including the following steps:

[0043] Step 1. Select 5 high-quality oblique measurement links nationwide as background links;

[0044] Step 2. Use the vertical survey data fof2, foE and M(3000)F2 factors of 14 domestic radio wave observation stations, and obtain the vertical survey data fof2, foE and M( 3000) F2 factor, the above fof2 refers to the ionosphere F 2 The critical frequency of the ionosphere, foE refers to the critical frequency of the E layer of the ionosphere;

[0045] Step 3. Obtain the 3 vertical survey data and the highest available frequency MUF data of the oblique survey link at the midpoint of the 5 background links during the historical ionospheric storm, and preprocess the background link data as the following step 4 training samples;

[0046] Described step 3 specifically c...

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Abstract

The invention discloses a maximum usable frequency calculating method for shortwave links during ionospheric storms. The method comprises the steps that 1 five high-quality oblique links are preferably nationwide and are used as background links; 2 fof2, foE and M(3000)F2 factors of vertical survey data of 14 radio wave observing stations in China are used; 3 three vertical survey data and the oblique link maximum usable frequency MUF data of the midpoint of five background links during historical ionospheric storms are acquired; and 4 the vertical survey data, which are interpolated in the step 3, of the midpoint of the links during ionospheric storms are used as the input in the ITU-R P533 recommended calculation formula of the maximum usable frequency of shortwaves. According to the maximum usable frequency calculating method for shortwave links during ionospheric storms, the maximum usable frequency of shortwave links during ionospheric storms is acquired; and based on the ITU-R P.533 recommended shortwave link maximum usable frequency calculating formula, the ionospheric state information during ionospheric storms is combined to establish the maximum usable frequency calculating method suitable for shortwave links during ionospheric storms.

Description

technical field [0001] The invention relates to the technical fields of short-wave communication and radar, in particular to a method for calculating the highest available frequency of short-wave links during ionospheric storms. Background technique [0002] High-frequency radio signals emitted upward from the ground can be reflected by the ionosphere, which is the main mode of propagation of short-wave sky-wave signals. When high-frequency radio signals are reflected by the ionosphere, there is a maximum usable frequency (MUF) related to the reflected electron density. If the frequency is higher than this value, the radio waves will penetrate the ionosphere and never return to the ground. By interpreting the vertical ionization map and obtaining parameters such as fof2 and M(3000)F2 factors, the MUF reflected above the observation station on the 3000km path can be obtained. At the same time, the ionospheric oblique detection also realizes the short-wave detection between t...

Claims

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Application Information

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IPC IPC(8): H04B17/382
CPCH04B17/382
Inventor 王飞飞盛冬生孙树计刘玉梅
Owner 中国电波传播研究所
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