Precise time calibration method and system for electromagnetic field observation data of Zhang Heng No.1 satellite

Abstract

The invention provides a precision time calibration method and system technology for electromagnetic field observation data of the Zhang Heng No.1 satellite. The method comprises the following steps: carrying out preprocessing of filtering, interpolation and resampling on EFD waveform data; for the SCM waveform data and the preprocessed EFD data, using a sliding window extremum detection method to carry out automatic detection of spatial phenomena and parameter setting; setting a window with a set length by taking the detected event mark position as a center, and performing matching between SCM and EFD by using JS divergence; selecting a window serial number with the highest similarity, obtaining an optimal matching position, and taking the optimal matching position as a time calibration value; and completing time synchronization between the SCM data and the EFD data according to the time calibration value. According to the Zhang Heng No.1 satellite electromagnetic field observation data precision time calibration method and system provided by the invention, matching type time calibration can be carried out by adopting an event automatic detection method.

Description

Technical field [0001] The present invention relates to a remote telemetry technology, and particularly relates to a precision time calibration method and system for electromagnetic Zhangheng first satellite observations. Background technique [0002] Zhang Heng first satellite into orbit in February 2018 to run for the country's first electromagnetic monitoring test satellite, carried by the electric field detector (EFD) and induction magnetometer (SCM), using different time collector, the found that two or more loads observation data error exists in the time stamp, and the electromagnetic fields in the observed data physics research applications such as analysis of the wave vector space, the electromagnetic field about the precise time calibration method of observation data on the relevant journals not been reported . Inventive content [0003] The present invention is to solve the technical problem of providing a first satellite Heng precise time calibration data field observ...

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Problems solved by technology

[0002] The Zhangheng-1 satellite was launched into orbit in February 2018. It is my country's first electromagnetic monitoring test satellite. The electric field detector (EFD) and induction magnetometer (SCM) carried by it use different time collectors respectively. The study found that the observation data of the above two loads has errors in the time label, and it affects the research and application of electromagnetic field observation data in space physics such as wave vector analysis. The precise time calibration method of electromagnetic field observation data has not yet been reported in related journals

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