Long-wave ground wave propagation delay time-varying characteristic prediction method applied to long distance

Abstract

The invention discloses a long-wave ground wave propagation delay time-varying characteristic prediction method applied to a long distance, and the method comprises the steps: firstly building a long-term monitoring system of long-wave ground wave propagation delay, and obtaining long-wave ground wave propagation delay data; selecting proper position points near the propagation path, and acquiringthree kinds of meteorological data of temperature, humidity and atmospheric pressure of the position points; preprocessing the acquired propagation time delay data and meteorological data; and finally, according to the preprocessed propagation time delay data and meteorological data, using a generalized regression neural network (GRNN) for prediction, and obtaining long-distance long-wave groundwave propagation time delay time-varying characteristics. According to the invention, high-precision prediction of long-distance long-wave ground wave propagation delay time-varying characteristics isrealized, and the precision of a land-based long-wave navigation / time service system is improved.

Description

technical field [0001] The invention belongs to the technical field of ground-based long-wave navigation / timing, and in particular relates to a long-distance long-wave ground wave propagation time-delay variable characteristic prediction method. Background technique [0002] Long-wave ground wave signals are widely used in navigation, positioning and timing systems due to their high transmit power, strong anti-interference ability, wide coverage, and stable propagation. When a long-wave ground wave signal propagates along the earth's surface, the atmospheric refractive index on the propagation path and the electrical properties of the earth's surface will change with the change of climate and weather conditions, so that the propagation delay exhibits complex time-varying characteristics. [0003] In the prior art, when the propagation distance is short, the prediction accuracy of the long-wave ground wave propagation delay has been significantly improved, but when the propag...

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, the prediction accuracy of long-wave ground wave propagation delay has been significantly improved when the propagation distance is relatively short, but there are relatively few studies on the prediction of long-wave ground-wave propagation delay when the propagation distance is long. The wave propagation delay is the result of the comprehensive effect of various meteorological factors on the entire propagation path.

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