Ionosphere TEC (Total Electron Content) anomaly detection method

Abstract

The invention discloses an ionosphere TEC (Total Electron Content) anomaly detection method, which mainly comprises the steps of forming an ionosphere TEC time sequence, performing decomposition and reconstruction by using SSA calculate a background value, adopting a sliding quartile range method for an absolute value of the difference of the background value and an observed value to calculate a tolerance value at each moment of the detection day, and thus calculating an upper limit value and a lower limit value of the detection day. Singular spectrum analysis is adopted and slides day by day to calculate ionosphere TEC anomalies on the other days. The ionosphere TEC anomaly detection method performs ionosphere IEC anomaly detection based on a sliding singular spectrum analysis method, not only considers the background value of the ionosphere TEC at the detection moment, but also applies the traditional sliding quartile range method to the absolute value of the difference of the time sequence observed value and the background value to calculate the upper limit value and the lower limit value at each moment of the detection day, so that the accuracy and precision of an ionosphere TEC anomaly detection result are greatly improved by using robust statistical mathematical features of the sliding quartile range method, and the ionosphere TEC anomaly detection method has a characteristic of being universal.

Description

technical field [0001] The invention relates to an ionospheric TEC anomaly detection method, in particular to a method for ionospheric TEC anomaly detection using a sliding singular spectrum analysis method. Background technique [0002] The ionosphere (Ionosphere) is an ionized region of the Earth's atmosphere. Due to the ionization of neutral atoms and air molecules by extra-terrestrial rays, especially solar radiation, the earth's atmosphere above 60km from the earth's surface is in a state of partial ionization or complete ionization. The partially ionized region of the atmosphere is the ionosphere, and the fully ionized region is called the magnetosphere. There are a large number of free electrons and ions in the ionosphere, so it has special physical and chemical properties. The generation, movement and neutralization of free electrons lead to complex physical mechanisms of the ionosphere. The ionosphere is constantly moving and changing, and the main parameter char...

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Problems solved by technology

[0006] Among them, the average value method and the median method are static detection methods, and the control and detection data have covered the effects before and after the time point in time, and the abnormal data in the sample data cannot be eliminated, making the calculated background value very unreasonable

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