Satellite navigation wide area augmentation system-based shortwave frequency selection method and system

Abstract

The invention discloses a satellite navigation wide area augmentation system-based shortwave frequency selection method and system. The shortwave frequency selection method comprises the following steps of: calculating a path intermediate point between a first position and a second position of a communication link; receiving wide area augmentation information through a satellite navigation receiver, and acquiring ionized layer grid point sequencing information and a corresponding ionized layer vertical transmission delay value; finding out a plurality of ionized layer grid points closest to the path intermediate point of the communication link; finding out the ionized layer vertical transmission delay value corresponding to the plurality of ionized layer grid points; calculating a weighted ionized layer vertical transmission delay value of the path intermediate point of the communication link; converting the weighted ionized layer vertical transmission delay value to a total ionized layer electron concentration content value; converting the total ionized layer electron concentration content value to a value of critical frequency of an F2 ionized layer; and calculating the corresponding shortwave communication frequency according to the critical frequency of the F2 ionized layer. As in comparison with the traditional method, the invention has the advantages of high precision and real time, great reduction of calculation amount and data quantity and capability of overcoming the difficulty of insufficient ionized layer reference in China.

Description

technical field [0001] The present invention relates to a selection method and system of short-wave communication frequency, in particular to a selection method and system of short-wave communication frequency based on satellite navigation wide-area augmentation system. Background technique [0002] Short-wave communication is a communication that uses the reflection or scattering of the high-altitude ionosphere, which can realize long-distance communication transmission. According to the distribution of electrons, the ionosphere is usually divided into three layers, which are called D layer, E layer, and F layer (divided into F1 and F2 layers during the day) from bottom to top according to height. Due to irregular changes in the ionosphere, short-wave communication links are likely to be unstable. In order to establish reliable short-wave communication, a frequency cannot be arbitrarily selected within the short-wave frequency band. On a path with a given distance and dir...

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but this data has not been used to select frequencies for shortwave communications

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