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CN-122017760-A - Low latitude high frequency radar ionosphere monitoring data product generation method and system

CN122017760ACN 122017760 ACN122017760 ACN 122017760ACN-122017760-A

Abstract

The invention provides a method and a system for generating low-latitude high-frequency radar ionosphere monitoring data products, which comprise the steps of receiving echo signals of a low-latitude high-frequency radar ionosphere, carrying out quadrature demodulation and digital sampling on the echo signals to generate original in-phase and quadrature data, carrying out beam synthesis on the original in-phase and quadrature data according to receiving channels of a main array and an auxiliary array to obtain two paths of beam in-phase and quadrature records, forming time delay combined data according to the two paths of beam in-phase and quadrature records, carrying out phase fitting on the time delay combined data to generate a fitting autocorrelation function, and drawing a scattered echo fast view of the low-latitude high-frequency radar ionosphere according to the fitting autocorrelation function.

Inventors

  • ZHANG MIN
  • LI RUI

Assignees

  • 商海(北京)人工智能技术研究院有限公司

Dates

Publication Date
20260512
Application Date
20260206

Claims (10)

  1. 1. A method for generating low latitude high frequency radar ionosphere monitoring data products, comprising: receiving echo signals of a low-latitude high-frequency radar ionosphere, and carrying out quadrature demodulation and digital sampling on the echo signals to generate original in-phase quadrature data; carrying out wave beam synthesis on the original in-phase and quadrature data according to the receiving channels of the main array and the auxiliary array to obtain two paths of wave beam in-phase and quadrature records; forming time delay combination data according to the two paths of wave beam in-phase and quadrature records, and performing phase fitting on the time delay combination data to generate a fitting autocorrelation function; And drawing a scattered echo fast view of the low latitude high frequency radar ionosphere according to the fitting autocorrelation function.
  2. 2. The method of claim 1, wherein forming delay combination data from the two-beam in-phase-quadrature recordings comprises: Respectively extracting sampling sequences corresponding to the same group of non-equidistant pulses from the two paths of wave beam in-phase and quadrature records; And respectively grouping the two paths of sampling sequences according to a preset non-fuzzy combination sequence to obtain time delay combination data corresponding to each path of sampling sequence.
  3. 3. The method of claim 2, wherein the sampling sequence contains echo amplitude and phase information corresponding to each detection distance; the non-fuzzy combination sequence is designed based on the transmission time sequence and the detection resolution of non-equidistant pulses and is used for eliminating the superposition interference of different pulse echoes; The time delay combination data are sequentially arranged according to preset time delay intervals.
  4. 4. The method of claim 1, wherein said phase fitting the delay combination data to generate a fitted autocorrelation function comprises: carrying out phase extraction on the effective time delay in the time delay combination data based on a preset fitting algorithm to obtain phase information corresponding to each effective time delay; Identifying phase cycle slip according to the change characteristics of the phase information, and eliminating the phase cycle slip through phase difference correction of adjacent effective time delay to obtain a continuous phase sequence; and generating a fitting autocorrelation function according to the continuous phase sequence.
  5. 5. The method of claim 4, wherein said generating a fitted autocorrelation function from said continuous phase sequence comprises: fitting the continuous phase sequence by adopting a least square linear fitting method to obtain a phase change characteristic; inverting echo signal-to-noise ratio, doppler speed and Doppler spectrum width based on the phase change characteristics; And integrating the echo signal-to-noise ratio, the Doppler speed and the Doppler spectrum width with the effective time delay in a correlation way to generate a fitting autocorrelation function.
  6. 6. The method of claim 1, wherein said mapping a scattered echo snapshot of the low latitude high frequency radar ionosphere according to the fitted autocorrelation function comprises: Extracting a fitting autocorrelation function of east detection and a fitting autocorrelation function of west detection from the fitting autocorrelation functions; Performing time sequence arrangement on the fitted autocorrelation function of the western detection after performing distance value inversion on the fitted autocorrelation function of the eastern detection to obtain a fitted autocorrelation function with time sequence; and drawing a scattered echo fast view of the low latitude high frequency radar ionosphere according to the fitted autocorrelation function of the elapsed time sequence.
  7. 7. The method of claim 6, wherein said mapping a scattered echo snapshot of the low latitude high frequency radar ionosphere from the fitted autocorrelation function of the elapsed time ordering comprises: Extracting echo signal-to-noise ratio, doppler speed and Doppler spectrum width parameters corresponding to each time node and each range gate from the fitted autocorrelation function of the time sequence; Constructing a sub-graph structure of a scattered echo rapid view according to a preset layout rule according to echo signal-to-noise ratio, doppler speed and Doppler spectrum width parameters corresponding to each time node and each range gate; Performing tone mapping on the sub-picture structure to obtain image pixel color information; and drawing a scattered echo fast view of the low latitude high frequency radar ionosphere according to the preset pixel size according to the image pixel color information.
  8. 8. A low latitude high frequency radar ionosphere monitoring data product generation system, comprising: the signal modulation module is used for receiving echo signals of the low-latitude high-frequency radar ionosphere, carrying out quadrature demodulation and digital sampling on the echo signals, and generating original in-phase quadrature data; the beam synthesis module is used for carrying out beam synthesis on the original in-phase and quadrature data according to the receiving channels of the main array and the auxiliary array to obtain two paths of beam in-phase and quadrature records; the phase fitting module is used for forming time delay combination data according to the two paths of wave beam in-phase and quadrature records, and carrying out phase fitting on the time delay combination data to generate a fitting autocorrelation function; And the product drawing module is used for drawing a scattered echo fast view of the low latitude high frequency radar ionosphere according to the fitting autocorrelation function.
  9. 9. The system of claim 8, wherein the phase fitting module comprises: The sequence extraction submodule is used for respectively extracting sampling sequences corresponding to the same group of non-equidistant pulses from the two paths of wave beam in-phase quadrature records; And the sequence grouping sub-module is used for respectively grouping the two paths of obtained sampling sequences according to a preset non-fuzzy combination sequence to obtain time delay combination data corresponding to each path of sampling sequence.
  10. 10. The system of claim 9, wherein the sampling sequence contains echo amplitude and phase information corresponding to each probe distance; the non-fuzzy combination sequence is designed based on the transmission time sequence and the detection resolution of non-equidistant pulses and is used for eliminating the superposition interference of different pulse echoes; The time delay combination data are sequentially arranged according to preset time delay intervals.

Description

Low latitude high frequency radar ionosphere monitoring data product generation method and system Technical Field The invention relates to the technical field of space environment foundation monitoring, in particular to a method and a system for generating low-latitude high-frequency radar ionosphere monitoring data products. Background Currently, the ionosphere is an important component of the earth's atmosphere, and its dynamic changes (e.g., inhomogeneity generation, drift, dissipation) have a significant impact on human activities such as radio communications, navigation positioning, satellite measurement and control, etc. The ionosphere in low latitude areas is affected by geomagnetic field configuration, solar radiation, atmospheric fluctuation and other multiple factors, and changes are more complex, so that the ionosphere is very important to develop high-precision and long-time sequence monitoring. Current low latitude ionosphere monitoring mainly relies on devices such as high frequency radar, VHF radar, but the prior art has the following disadvantages: 1. The data product system is incomplete, most monitoring devices only output original observation data (such as IQ signals) or single intermediate data (such as power spectrum), a grading system from the original data (L0) to inversion parameters (L2) to visual products (L2Q) is lacking, the differentiated requirements of different users (such as equipment maintainers, scientific researchers and engineering application personnel) cannot be met, the product definition is ambiguous, and the product definition is difficult to be used as a unified basis for cross-system cooperation; 2. The data processing flow is not standard, in the existing processing method, the combination logic of non-equidistant pulses and the identification of bad time delay (distance gate cross interference and emission shielding interference) in the self-correlation function calculation lack of a standardized scheme, so that the result difference of the same observed data processed by different methods is larger; 3. The prior art is weak in data quality control, wherein the prior art is mostly dependent on single hardware calibration (such as channel amplitude and phase correction), lacks of a full-link quality control scheme of hardware inspection, data verification and multi-equipment comparison, and does not have an explicit quality control index (such as qualified data proportion), so that the data reliability is difficult to evaluate, and part of abnormal data (such as invalid echo caused by antenna fault) is mixed into effective data to influence subsequent application; 4. The space-time and file specification is lost, namely, a time system (such as local time and UTC time) and a coordinate system (such as radar station coordinates and geographic coordinates) adopted by different monitoring equipment are not uniform, file naming rules are disordered, so that multi-station data are spliced, cross-platform sharing efficiency is low, and a large-scale ionosphere monitoring data set is difficult to form; in summary, the lack of standardized data product systems, standardized data processing flows, full link quality control schemes, and unified space-time and file management specifications in the prior art, results in the technical problems of insufficient reliability of low-latitude ionosphere monitoring data quality, difficulty in meeting differentiated application requirements, and low cross-system sharing efficiency. Disclosure of Invention In order to solve the technical problems, the invention provides a method for generating low latitude high frequency radar ionosphere monitoring data products, which comprises the following steps: receiving echo signals of a low-latitude high-frequency radar ionosphere, and carrying out quadrature demodulation and digital sampling on the echo signals to generate original in-phase quadrature data; carrying out wave beam synthesis on the original in-phase and quadrature data according to the receiving channels of the main array and the auxiliary array to obtain two paths of wave beam in-phase and quadrature records; forming time delay combination data according to the two paths of wave beam in-phase and quadrature records, and performing phase fitting on the time delay combination data to generate a fitting autocorrelation function; And drawing a scattered echo fast view of the low latitude high frequency radar ionosphere according to the fitting autocorrelation function. Optionally, the forming delay combination data according to the two-path beam in-phase and quadrature records includes: Respectively extracting sampling sequences corresponding to the same group of non-equidistant pulses from the two paths of wave beam in-phase and quadrature records; And respectively grouping the two paths of sampling sequences according to a preset non-fuzzy combination sequence to obtain time delay combination data corresponding to each path of sam