GPS remote sensing flood early warning method based on artificial intelligence decision tree

Abstract

The invention discloses a GPS remote sensing flood prediction method based on an artificial intelligence decision tree. The method comprises the following steps: S1, reading an original observation value of a GPS satellite; s2, preprocessing an original observation value; s3, generating flood detection quantity by adopting information of pseudo-range difference, carrier phase difference and epoch time interval between epochs, wherein the flood detection quantity comprises first detection quantity and second detection quantity; s4, establishing a flood detection model based on satellite and frequency by adopting an artificial intelligence decision tree algorithm; s5, flood is detected by combining the first detection quantity and the second detection quantity of the GPS dual-frequency signal, and a result is marked according to a detection threshold value; and S6, performing flood early warning or updating and iterating the flood detection model according to a detection result. A high-precision flood detection model is established based on an artificial intelligence decision tree algorithm, the correlation between the detection amount and other auxiliary characteristic parameters is deeply excavated, the false detection rate is reduced, and the accuracy and stability of flood detection are ensured.

Description

technical field [0001] The invention relates to the technical field of navigation satellite remote sensing inversion, in particular to a GPS remote sensing flood prediction method based on an artificial intelligence decision tree. Background technique [0002] With global warming and changes in urban hydrological effects caused by urbanization, extreme heavy rainfall is extremely likely to cause urban waterlogging and local flooding in cities and towns, increasing the risk of urban flood disasters. For example, the urban flood that occurred in Wuhan City, Hubei Province in early July 2016, the urban and rural local flood disaster that occurred in Hami City, Xinjiang in July 2018, and the local urban flood disaster that occurred in Xinxiang, Henan Province in July 2021, caused dozens of People died, and the direct economic loss was as high as 3 billion yuan. It can be seen that short-term local waterlogging and floods in the city seriously threaten the lives and property safe...

AI Technical Summary

Problems solved by technology

[0003] At present, flood detection methods based on navigation satellite inversion can be mainly divided into two categories from the perspective of observation values. The first category is flood early warning detection based on signal carrier-to-noise ratio observations, but the performance of carrier-to-noise ratio in different arcs The difference is large, especially in the process of flood detection, the CNR fluctuation is more obvious in the high arc section (the altitude angle is greater than 60 degrees) than in the low arc section (the altitude angle is lower than 30 degrees), which leads to the conventional The efficiency of the detection method with low arc carrier-to-noise ratio is reduced

In addition, the detection method based on carrier-to-noise ratio is severely restricted by the type of receiver

For example, the observed value of carrier-to-noise ratio output by receivers of different manufacturers is very different, making it difficult to establish a uniform and standardized detection threshold

However, some carrier-to-noise ratios use approximate output, resulting in lower resolution of the carrier-to-noise ratio, which seriously reduces the accuracy of flood detection.

In addition, some receivers do not have the function of outputting carrier-to-noise ratio, which will make this method invalid

The second type is flood detection and early warning based on pseudorange and carrier phase observations, but the existing methods are based on the combination of pseudorange and carrier phase observations, and the combination of observations will cause noise and other errors (such as tropospheric residuals and ionospheric residuals), resulting in low accuracy of existing detection methods based on pseudorange and carrier phase observations

In addition, the current method does not take into account the influence of gross errors on the observed values, resulting in a low detection success rate, while the establishment of the detection model ignores the correlation of characteristic parameters, which also leads to a high false detection rate in the existing method, resulting in excessive false alarm

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