CN-121980165-A - GeO and SSO cross-platform satellite high-energy proton data collaborative calibration method based on solar proton event

CN121980165ACN 121980165 ACN121980165 ACN 121980165ACN-121980165-A

Abstract

The invention discloses a solar proton event-based GEO and SSO cross-platform satellite high-energy proton data collaborative calibration method which comprises the steps of obtaining GEO and SSO high-energy proton observation data and space environment disturbance parameter data, preprocessing to obtain unified flux type high-energy proton data, satellite space-time position data and environment parameters, defining and screening high-energy proton data during an event according to the solar proton event, obtaining a plurality of event data sets and grouping, carrying out alignment processing on the screened GEO and SSO high-energy proton data, constructing an energy matching relation of each energy channel of the GEO and the SSO based on power law spectrum characteristics of the solar proton event, determining effective energy and energy intervals of each energy channel of the SSO through point-by-point spectrum fitting and statistical inversion, calculating differential flux of the GEO in corresponding energy channels again by utilizing the calibrated effective energy, establishing a point-by-point scattered point matrix of the two types of satellite data, and carrying out linear fitting and correlation analysis to realize calibration.

Inventors

WANG CHUNQIN
SHEN GUOHONG
HOU DONGHUI
SUN YING
ZHANG HUANXIN

Assignees

中国科学院国家空间科学中心

Dates

Publication Date: 20260505
Application Date: 20251222

Claims (9)

1. A GEO and SSO cross-platform satellite high-energy proton data collaborative calibration method based on solar proton events comprises the following steps: Step 1, acquiring high-energy proton observation data and space environment disturbance parameter data of a geosynchronous orbit satellite and a solar geosynchronous orbit satellite, and preprocessing to obtain high-energy proton data, satellite space-time position data and environment parameters of a unified flux type; step 2, defining high-energy proton data during the screening event according to solar proton event to obtain a plurality of event data sets, and grouping the data sets according to solar wind dynamic pressure and geomagnetic Dst indexes; Step 3, aligning the high-energy proton data of the screened geosynchronous orbit and solar geosynchronous orbit satellites; Step 4, based on the power law spectrum characteristics of the solar proton event, constructing an energy matching relation between the geosynchronous orbit satellite and each energy channel of the solar geosynchronous orbit satellite, and determining the effective energy and energy interval of each energy channel of the solar geosynchronous orbit satellite through point-by-point spectrum fitting and statistical inversion; And 5, recalculating differential flux of the geosynchronous orbit satellite in the corresponding energy channel by using the calibrated effective energy, establishing a point-by-point scattered point matrix of the two types of satellite data, and carrying out linear fitting and correlation analysis to obtain a calibration relation of the cross-platform flux.
2. The method for collaborative calibration of GEO and SSO cross-platform satellite high-energy proton data based on solar proton events according to claim 1, wherein the step 1 of obtaining high-energy proton observation data and spatial environment disturbance parameter data of geosynchronous orbit satellites and solar geosynchronous orbit satellites comprises: high-energy proton observation data of the geosynchronous orbit satellite and the solar geosynchronous orbit satellite in different energy channels; The observation time, the observation position and the observation direction data of the geosynchronous orbit satellite and the solar synchronous orbit satellite; the spatial environment disturbance parameter data at least comprises solar wind speed, solar wind proton mass density and geomagnetic Dst index.
3. The method for collaborative calibration of GEO and SSO cross-platform satellite high energy proton data based on solar proton events according to claim 1, wherein step 3 comprises: The quasi-in-situ measurement sequence alignment processing is used for eliminating the modulation influence of the magnetic layer and obtaining high-energy proton observation data meeting the same solar proton event; Time alignment processing, which is used for mapping the observation data of the solar synchronous orbit satellite to a unified time sequence in a weighted average mode by taking a fixed sampling time interval of the solar synchronous orbit satellite as an alignment grid; The method comprises the steps of determining an event time window, calculating a 5-minute counting average value of 24 hours before an event for each proton energy channel respectively as a background value, subtracting the background value of the corresponding channel from the observed count of each frame in the event window to obtain a preliminary net flux, and carrying out data cleaning to obtain a net proton observed flux sequence with physical significance.
4. The solar proton event based GEO and SSO cross-platform satellite high energy proton data collaborative calibration method according to claim 3, wherein the quasi-in-situ measurement sequence alignment process comprises: Screening proton data of a quasi-open magnetic line area from western observation data by combining a magnetic layer model or geomagnetic activity index from geosynchronous orbit satellite data; and determining the position of an open magnetic line based on the change of a proton flux-magnetic shell parameter L by combining a magnetic layer model or geomagnetic activity index from solar synchronous orbit satellite data, and screening out proton data of a quasi-open magnetic line area.
5. The solar proton event based GEO and SSO cross-platform satellite high energy proton data collaborative calibration method according to claim 3, wherein the time alignment process comprises: Taking a fixed sampling time interval of a geosynchronous orbit satellite as an alignment grid, constructing a central moment t_k, taking each t_k as a center, intercepting a solar geosynchronous orbit satellite original data point in a time window, wherein the time window is +/-30 seconds, and the change of a magnetic shell parameter L value in the time window is less than 0.05; And calculating inverse time weight for each data point in the time window, and respectively carrying out weighted average on the observation time and the proton flux based on the weight to obtain the equivalent observation time and the equivalent flux at the time t_k.
6. The solar proton event based GEO and SSO cross-platform satellite high energy proton data collaborative calibration method according to claim 3, wherein the determination of event time windows in the background processing includes: When the high-energy channel is triggered, searching that the count of 3 continuous data points is larger than the average value +3σ of the static day, and taking the moment corresponding to the first data point as the starting moment, wherein the average value of the static day is the count average value of the first 24 hours, and σ is the standard deviation; when the high-energy channel is not triggered, the degradation is triggered, the secondary low-energy channel is switched, a looser statistical threshold and a set absolute channel lower limit are adopted as criteria, and on the degradation channel, the moment of a first data point of continuous 3 data points meeting the criteria is the starting moment; starting from the starting moment, searching for the count of 6 continuous data points which are all larger than the average value of the static day +1σ, and taking the moment corresponding to the last data point as the ending moment; And determining an event time window according to the starting time and the ending time.
7. The solar proton event based GEO and SSO cross-platform satellite high energy proton data collaborative calibration method according to claim 6, wherein the background processing further comprises: Within the determined event time window, the following processing is performed: calculating a 5-minute count average value 24 hours before an event for each proton energy channel as a background value of the energy channel; Subtracting the background value of the corresponding channel from the observed count of each frame in the event window to obtain a preliminary net flux; If the preliminary net flux is <0 or < 2σ, then zero the value; Thereby obtaining a net proton observed flux sequence after background subtraction and data washing.
8. The method for collaborative calibration of GEO and SSO cross-platform satellite high-energy proton data based on solar proton events according to claim 1, wherein step 4 comprises: step 4-1, adopting a geometric mean value as geometric center energy of each energy channel of the geosynchronous orbit satellite; Step 4-2, carrying out overlap length calculation on the nominal energy interval of each energy channel of the solar synchronous orbit satellite and the energy interval of each channel of the geosynchronous orbit satellite, and selecting the first 3 geosynchronous orbit channels according to the descending order of the overlap length to complete energy matching; Step 4-3, for each alignment time point, obtaining the spectrum index and intercept of the corresponding alignment time point through power law spectrum fitting by utilizing the flux of 3 geosynchronous orbit channels matched with each energy channel of the solar geosynchronous orbit satellite and the geometric center energy thereof; and 4-4, determining the effective energy, the lower energy limit and the upper energy limit of each energy channel of the solar synchronous orbit satellite through statistical inversion.
9. The method for collaborative calibration of GEO and SSO cross-platform satellite high energy proton data based on solar proton events according to claim 1, wherein step 5 comprises: Setting weight coefficient 1, The energy is inversely solved by the following relation : ; Wherein, the Flux is observed for protons at the nominal energy track i of the solar synchronous orbit, Effective energy in geosynchronous orbit Proton flux observed at and with the SSO nominal energy channel Proton observation flux corresponding to the same time; all of them are reversely solved Counting according to preset step length segments, taking the median value of the highest frequency segment as the final effective energy of the energy channel ; By adjusting the weighting coefficients 0.5 And 1.5, and repeating the above processes to obtain the lower energy limit of the energy channel Upper limit of energy 。

Description

GeO and SSO cross-platform satellite high-energy proton data collaborative calibration method based on solar proton event Technical Field The invention belongs to the technical field of space environment monitoring, and particularly relates to a solar proton event-based GEO and SSO cross-platform satellite high-energy proton data collaborative calibration method. Background The high-energy proton radiation detection is a core technical means for constructing a space weather early warning and on-orbit protection system. The real-time detection data directly drive the emergency response decision of the aerospace task, including the on-off instruction of the effective load, the cabin-out activity scheduling of manned aerospace and the like, and provide a key quantitative basis for the radiation protection design of the spacecraft. Meanwhile, the long-term observation data has irreplaceable value for inverting the solar activity rule and the cognitive radiation dynamic evolution rule, and is a scientific basis for supporting deep space exploration, manned aerospace and long-distance mission planning. At present, due to inherent differences of detection instruments in physical design, manufacturing process and the like, performance evolution can occur under the influence of factors such as space radiation environment and the like during in-orbit operation, unavoidable differences exist between ground calibration conditions and real space environment, and the factors commonly cause systematic deviation which is difficult to neglect on observation data of different instruments, even different track platforms, in the same space environment. The systematic deviation restricts the effective fusion and mutual verification of the multi-source detection data, directly reduces the accuracy and reliability of the space environment state assessment, and becomes a main obstacle for realizing high-precision space weather early warning and deepening space physical science research. Geosynchronous orbit satellites and solar geosynchronous orbit satellites constitute important struts of a spatial environment monitoring network. The solar synchronous orbit satellite is used as a fixed-point whistle, can continuously monitor the initiation, the intensity and the time evolution of a solar proton event, and can effectively detect the sedimentation process of high-energy protons along magnetic force lines of polar regions. The two can be complemented in function, but due to the systematic deviation, the observation data of the two track platforms are difficult to be subjected to deep fusion and collaborative analysis on a unified physical standard at present, so that the complete cognition and accurate prediction of the full-chain physical process of solar proton event propagation from solar dome layers and magnetic layer invasion to polar region settlement are limited. Disclosure of Invention The invention aims to overcome the defects of the prior art and provides a GEO and SSO cross-platform satellite high-energy proton data collaborative calibration method based on solar proton events. GEO (Geostationary Earth Orbit) is a geosynchronous orbit, and SSO (Sun-Synchronous Orbit) is a solar synchronous orbit. In view of this, the invention provides a GEO and SSO cross-platform satellite high-energy proton data collaborative calibration method based on solar proton events, comprising: Step 1, acquiring high-energy proton observation data and space environment disturbance parameter data of a geosynchronous orbit satellite and a solar geosynchronous orbit satellite, and preprocessing to obtain high-energy proton data, satellite space-time position data and environment parameters of a unified flux type; step 2, defining high-energy proton data during the screening event according to solar proton event to obtain a plurality of event data sets, and grouping the data sets according to solar wind dynamic pressure and geomagnetic Dst indexes; Step 3, aligning the high-energy proton data of the screened geosynchronous orbit and solar geosynchronous orbit satellites; Step 4, based on the power law spectrum characteristics of the solar proton event, constructing an energy matching relation between the geosynchronous orbit satellite and each energy channel of the solar geosynchronous orbit satellite, and determining the effective energy and energy interval of each energy channel of the solar geosynchronous orbit satellite through point-by-point spectrum fitting and statistical inversion; And 5, recalculating differential flux of the geosynchronous orbit satellite in the corresponding energy channel by using the calibrated effective energy, establishing a point-by-point scattered point matrix of the two types of satellite data, and carrying out linear fitting and correlation analysis to obtain a calibration relation of the cross-platform flux. As an improvement of the above method, the step 1 of obtaining high-energy proton observation data and spa