Modeling method for low-frequency ground wave propagation delay variable characteristics

A technology of low-frequency ground wave and propagation delay, which is applied in the field of modeling of low-frequency ground wave propagation delay and time-varying characteristics, can solve the problems that the influence of propagation delay cannot be ignored, and the research on propagation delay system is less, so as to achieve the simplification of analysis , Accurate prediction, and the effect of improving accuracy

Active Publication Date: 2019-06-18
XIAN UNIV OF TECH
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Benefits of technology

This patented technology helps analyze the variations caused by atmospherically varying temperatures or moisture levels during the course of an astronomy mission's operation. It uses various techniques like radar reflection measurements from spacecraft to predict how long it takes between launches at different locations. By analyzing these variables, we aimed towards developing better ways to improve satellite location system performance.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the precision with which small waves (LFW) travel through different media under various conditions during signal reception or communication processes.

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  • Modeling method for low-frequency ground wave propagation delay variable characteristics
  • Modeling method for low-frequency ground wave propagation delay variable characteristics
  • Modeling method for low-frequency ground wave propagation delay variable characteristics

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[0063] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0064] Such as figure 1 As shown, a modeling method of the time-varying characteristics of low-frequency ground wave propagation delay in the present invention is specifically implemented according to the following steps:

[0065] Step 1: Build a long-term experimental detection system for low-frequency ground wave propagation delay, obtain propagation delay data and preprocess the data; (eg figure 2 shown)

[0066] The specific process of preprocessing is as follows: first remove the possibly invalid data; then denoise by wavelet filtering method to extract effective propagation delay measurement data; among them, the possibly invalid data includes the data when the GPS receiver is out of lock, the data of the long-wave receiver Data that is not locked and fails to decode, data that jumps during the measurement process, sudden data caused by

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Abstract

The invention discloses a modeling method for low-frequency ground wave propagation delay time-varying characteristics, and the method is specifically implemented according to the following steps: step 1, building a long-term experiment detection system of low-frequency ground wave propagation delay, obtaining propagation delay data, and carrying out the preprocessing of the data; step 2, acquiring meteorological data of three meteorological factors of temperature, humidity and wind speed of an area where a receiving point is located; step 3, analyzing the time-varying characteristics of the low-frequency ground wave propagation delay according to the propagation delay data obtained in the step 1 and the temperature, humidity and wind speed meteorological data obtained in the step 2; and step 4, establishing a propagation delay prediction model by using a BP neural network method. According to the invention, the precision of the low-frequency ground wave positioning navigation and timeservice system is improved.

Description

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Owner XIAN UNIV OF TECH
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