Neural network method for precisely determining tropospheric delay in region

Abstract

The invention discloses a neural network method for precisely determining tropospheric delays in a region; the neural network method comprises the following steps of: A1. obtaining an approximate true value of a tropospheric wet delay in a control point observation station; A2. establishing a tropospheric wet delay computation module in the region through the analogy computation of a neutral network; A3. computing a tropospheric dry delay in the region; A4. computing a tropospheric total delay in the region; and for other points in the region, obtaining delta 0<w>, delta +<w> and delta<w> through respective computation according to formulas (5), (7) and (8) as long as four ground meteorological parameters (P0, T0, h0 and e0) are obtained through meteorological observation, then obtaining delta<d> through computation according to a formula (9), and finally obtaining delta according to the formula (10). The invention puts forward a method for precisely determining a tropospheric delay modification module in the region by using an aerological sounding balloon for observing the appropriate true value of the tropospheric delay in the information extraction region and adopting a neutral network technology.

Description

technical field [0001] The present invention obtains the true value of the tropospheric delay (approximately) by combining a small amount of high-altitude sounding balloon data in the region, and uses neural network technology to establish a regional tropospheric delay correction model, which belongs to the "geodesysy" of the "surveying and mapping science and technology" discipline. "Technology field. Background technique [0002] In the past 30 years, with the rapid development of modern scientific and technological means such as electronics, communication and aerospace, the research and application of many science and technology are closely related to the influence of the atmosphere on radio wave propagation, and the troposphere in the atmosphere has become the entire earth space environment affecting human production. and one of the important factors of life. A regional tropospheric delay correction model is established to improve the accuracy of atmospheric tropospheri...

AI Technical Summary

Problems solved by technology

[0008] a. Although the traditional empirical model is a universal model, its calculation accuracy (especially the accuracy of wet delay) is not high when it is specific to the area;

[0009] b Although the second estimation method can obtain higher precision, it is difficult to determine the number of parameters, and it will affect the simulation results; in addition, the parameter estimation method is generally realized by post-event adjustment calculation, and the real-time performance is poor;

[0010] c Although the third external correction method can directly measure the influence of water vapor on the signal propagation path on the satellite signal propagation path, its disadvantages of heavy equipment, high cost, and difficult operation also limit its popularization in practical applications

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