A Calculation Method of Occasional Shortwave Field Strength in the E-Layer in Middle Latitudes

Abstract

The invention discloses a method for calculating accidental E-layer short wave field strength of a mid-latitude region. The method includes the following steps that A, according to position information of a receiving and transmitting point, a great circle distance and a reflecting point position of a short wave link and the electronic cyclotron frequency of the short wave link are calculated, anda radio wave radiation elevation is calculated based on the equivalent theorem; B, depending on a radio wave environment observation station of the science and technology industry of national defense,an ionized layer vertical sounding diagram and an ionized layer inclined sounding diagram of the reflecting point position are obtained; C, if there are no ionized layers foE and foEs which can be directly observed at the reflecting point position, firstly, an MUFEs value of inclined sounding is converted into an foEs value at a middle point of an inclined sounding link; D, according to short wave communication features, occurrence conditions of strong Es are determined, the ionized layer absorption loss of the reflecting point position is calculated, and accordingly the accidental E-layer field strength is worked out. According to method for calculating the accidental E-layer short wave field strength of the mid-latitude region, ionized layer vertical sounding and inclined sounding datacan be comprehensively utilized, and the foEs value of the reflecting point position is worked out.

Description

technical field [0001] The invention belongs to the field of ionospheric environment monitoring research, in particular to a method for calculating the occasional E-layer short-wave field strength in the mid-latitude region in the field. Background technique [0002] The sporadic E layer (Es layer) is the sudden inhomogeneous structure of the E layer, which is named for its indeterminate appearance time. Usually, the Es layer exists in the daytime in the equatorial region, and there is not much seasonal variation; the value of foEs in the mid-latitude region is relatively low, and there is obvious seasonal variation. It is especially worth noting that the southeastern region of my country is a high-occurrence area of ​​the Es layer. In the summer of the year with a low sunspot number, Es often appears, and the value of foEs is very high. The radio signal reflected by the Es layer is usually strong, but if the reflective layer is translucent, it may cause trouble for communi...

AI Technical Summary

Problems solved by technology

The disadvantage is: for the communication link, the calculation method of the signal field strength in the middle and low end of the HF band is not included; in practical applications, the foE observation value is different from the foE value definition of a given occurrence rate, and cannot Simply using the foE observation value to replace the foE value of a given occurrence rate, the current research on the change law of the ionospheric radio environment is far from meeting the requirements of Es communication calculations, and the prediction accuracy of the occasional E-layer field strength is difficult to meet the actual needs

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