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CN-122017759-A - Method and system for generating very high frequency coherent scattering radar data product

CN122017759ACN 122017759 ACN122017759 ACN 122017759ACN-122017759-A

Abstract

The invention provides a method and a system for generating a very high frequency coherent scattering radar data product, wherein the method comprises the steps of carrying out multi-channel signal synthesis, radio frequency interference suppression, IQ sampling and digital filtering, coherent accumulation, autocorrelation analysis and power spectrum calculation and parameter extraction on ionosphere echo signals acquired by a very high frequency coherent scattering radar to obtain standardized processing data, generating a four-stage data product based on the standardized processing data, carrying out full-flow quality control on the four-stage data product, carrying out standardized labeling on the four-stage data product subjected to quality control by adopting a unified space-time reference, and outputting the very high frequency coherent scattering radar data product.

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 a very high frequency coherent scatter radar data product, comprising: Acquiring an ionospheric echo signal by a very high frequency coherent scattering radar; Sequentially performing multi-channel signal synthesis, radio frequency interference suppression, IQ sampling and digital filtering, coherent accumulation, autocorrelation analysis, power spectrum calculation and parameter extraction on the echo signals to obtain standardized processing data; Generating four-level data products sequentially corresponding to the original data, the processing data, the application parameters and the visualized products based on the standardized processing data; performing full-flow quality control on the four-stage data product to obtain a four-stage data product subjected to quality control; The four-stage data products subjected to quality control are standardized and marked by adopting a unified space-time reference, and standardized very high frequency coherent scattering radar data products are output; The four-level data product respectively comprises echo original information, spectrum characteristic information, core application parameters and visual visualization results.
  2. 2. The method of claim 1, wherein the very high frequency coherent scattering radar is adapted to preset hardware parameters and is deployed with an antenna array for acquiring backscatter echo signals of ionosphere E and F inhomogeneities; The preset hardware parameters comprise one or more of working frequency, transmitting power, pulse parameters, beam width and detection range configuration; The pulse parameters include one or more of pulse width, duty cycle, and pulse repetition frequency; the antenna array is an array structure formed by a plurality of rows of multi-group three-unit yagi antennas.
  3. 3. The method of claim 1, wherein radio frequency interference rejection of the signal synthesized by the multichannel signal comprises: Filtering fixed interference signals outside the working frequency band of the very high frequency coherent scattering radar through band-pass filtering; Random interference signals in echo signals synthesized by the multichannel signals are restrained through adaptive filtering.
  4. 4. The method of claim 1, wherein IQ sampling and digital filtering the radio frequency interference suppressed signal comprises: Carrying out high-speed IQ sampling on the signals subjected to radio frequency interference suppression to obtain in-phase I signals and quadrature Q signals; And carrying out downsampling treatment on the sampling signal by adopting a preset decimation factor, and combining matched filtering and amplitude phase weighting to output a single-channel IQ echo signal.
  5. 5. The method of claim 4 wherein coherently accumulating the single-path IQ echo signals comprises: Acquiring an operation mode of the very high frequency coherent scattering radar; When the operation mode operates in the E area mode, adopting a first preset number of pulses to perform coherent accumulation; When the operation mode operates in the F area mode, adopting a second preset number of pulses to perform coherent accumulation; when the operation mode is operated in the scanning mode, adopting a third preset number of pulses to perform coherent accumulation; wherein the coherent accumulation achieves signal energy superposition by arithmetic summation.
  6. 6. The method of claim 1, wherein performing autocorrelation analysis and power spectrum calculation and parameter extraction on the coherently accumulated signals comprises: Partitioning the signals subjected to coherent accumulation according to a preset distance gate partitioning rule, and calculating an autocorrelation function of the signals in each distance gate; performing discrete Fourier transform on the autocorrelation function to obtain a power spectrum; fitting the power spectrum by adopting a Gaussian function, and extracting core application parameters; wherein the core application parameters include one or more of echo intensity, signal-to-noise ratio, spectral width, and Doppler velocity.
  7. 7. The method of claim 1, wherein performing full-process quality control on the four-stage data product results in a quality-controlled four-stage data product, comprising: Performing error correction on the four-stage data product to obtain an error corrected four-stage data product; Performing file verification on the four-stage data product after error correction to obtain a four-stage data product after file verification; performing anomaly identification on the four-stage data product after file verification, and marking numerical anomalies exceeding a preset parameter value range to obtain a quality-controlled four-stage data product; The error correction comprises hardware sampling error correction and spectrum leakage error correction; the hardware sampling error correction comprises AD sampling nonlinear correction and antenna phase deviation correction; The file verification comprises file name format verification, file header information verification, file size verification and data point number verification.
  8. 8. The method of claim 1, wherein the unified space-time reference comprises a time reference, a spatial reference, and a velocity reference; the time reference adopts a universal coordinated time UTC format and is used for marking the file name of the product and the time of the file content; the space reference adopts a geographic coordinate system GEO to mark the longitude and latitude of a site, and adopts a geodetic system WGS84 to mark the altitude; The speed reference is Doppler speed and the direction far away from the very high frequency coherent scatter radar is positive direction.
  9. 9. A very high frequency coherent scatter radar data product generation system, comprising: the signal acquisition module is used for acquiring ionospheric echo signals through the very high frequency coherent scattering radar; The standardized processing module is used for sequentially carrying out multichannel signal synthesis, radio frequency interference suppression, IQ sampling and digital filtering, coherent accumulation, autocorrelation analysis, power spectrum calculation and parameter extraction on the echo signals to obtain standardized processing data; the data processing module is used for generating four-level data products sequentially corresponding to the original data, the processing data, the application parameters and the visual products based on the standardized processing data; The quality control module is used for carrying out full-flow quality control on the four-stage data product to obtain a quality-controlled four-stage data product; The product output module is used for carrying out standardized marking on the four-level data products subjected to quality control by adopting a unified space-time reference and outputting standardized very high frequency coherent scattering radar data products; The four-level data product respectively comprises echo original information, spectrum characteristic information, core application parameters and visual visualization results.
  10. 10. The system of claim 9, wherein the very high frequency coherent scatter radar is adapted with preset hardware parameters and is deployed with an antenna array for acquiring backscatter echo signals of ionosphere E and F inhomogeneities; The preset hardware parameters comprise one or more of working frequency, transmitting power, pulse parameters, beam width and detection range configuration; The pulse parameters include one or more of pulse width, duty cycle, and pulse repetition frequency; the antenna array is an array structure formed by a plurality of rows of multi-group three-unit yagi antennas.

Description

Method and system for generating very high frequency coherent scattering radar data product Technical Field The invention relates to the technical field of ionosphere space weather observation, in particular to a method and a system for generating a very high frequency coherent scattering radar data product. Background At present, the ionosphere is used as a key component of the earth atmosphere, and the distribution, movement and evolution characteristics of the non-uniform body directly influence the stability of technical systems such as radio communication, navigation positioning, satellite measurement and control and the like. The low latitude ionosphere is subject to the complex actions of geomagnetic field, solar radiation and atmospheric circulation, and the heterogeneous body is active, so that the low latitude ionosphere is a core object for monitoring the space environment foundation. The Very High Frequency (VHF) coherent scattering radar is used as a core device for low latitude ionosphere observation, and the scientificity and standardability of data processing and product generation directly determine the application value of observation data. However, the existing very high frequency coherent scattering radar data processing and product generation technologies have a plurality of outstanding problems, and severely restrict the usability and application range of the data: The existing scheme outputs original IQ data or single power spectrum data, lacks a full chain grading system from the original data to processing data, application parameters and visual products, cannot meet the deep analysis requirement of scientific researchers on the original data and the rapid use requirement of engineering application personnel on visual parameters and visual results, and has limited data application scenes; The processing flow is not standard, the data consistency is poor, the key processing steps such as radio frequency interference suppression, coherent accumulation, autocorrelation analysis, power spectrum calculation and the like lack unified standards, the core processing parameters are not clearly defined, the processing flows and the parameter settings of different sites and different time periods are different, the data consistency is insufficient, and the research requirements such as multi-site joint analysis, long-term sequence comparison and the like are difficult to meet; The quality control mechanism is missing, the data reliability is insufficient, the means of the prior art for correcting data errors, checking file formats and identifying abnormal data are single, a quality control system covering the whole data processing process is not formed, the problems of easy residual hardware errors, spectrum leakage, abnormal values and the like in the data are solved, and the data reliability can not meet the requirements of high-precision observation and application; The space-time reference is not uniform, the data compatibility is poor, the time annotation format is not standard, the space coordinate system is inconsistent, the space-time correlation of the observed data of different sites and different time periods is poor, the observed data cannot be effectively integrated into the data system, and therefore the space-time correlation analysis of the cross sites and the cross time periods is difficult to realize. Disclosure of Invention In order to solve the above problems, the present invention provides a method for generating a very high frequency coherent scatter radar data product, comprising: Acquiring an ionospheric echo signal by a very high frequency coherent scattering radar; Sequentially performing multi-channel signal synthesis, radio frequency interference suppression, IQ sampling and digital filtering, coherent accumulation, autocorrelation analysis, power spectrum calculation and parameter extraction on the echo signals to obtain standardized processing data; Generating four-level data products sequentially corresponding to the original data, the processing data, the application parameters and the visualized products based on the standardized processing data; performing full-flow quality control on the four-stage data product to obtain a four-stage data product subjected to quality control; The four-stage data products subjected to quality control are standardized and marked by adopting a unified space-time reference, and standardized very high frequency coherent scattering radar data products are output; The four-level data product respectively comprises echo original information, spectrum characteristic information, core application parameters and visual visualization results. Optionally, the very high frequency coherent scattering radar is adapted to preset hardware parameters and is provided with an antenna array for acquiring backscattering echo signals of non-uniform bodies in an ionosphere E area and an ionosphere F area; The preset hardware parameters comprise one o