Radio astronomy interference signal reduction method, apparatus, and system and computer device

Patent metadata

Field	Value
Publication number	US-12308906-B2
Application number	US-202318242531-A
Country	US
Kind code	B2
Filing date	Sep 6, 2023
Priority date	Mar 15, 2023
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

The present disclosure relates to a radio astronomy interference signal reduction method, apparatus, and system and a computer device. The method includes: acquiring at least two beam signals, and obtaining a covariance matrix between all the beam signals according to the beam signals, wherein the beam signals include subsignals from at least two directions; performing eigen-decomposition processing on the covariance matrix to obtain signal eigenvectors and eigenvalues corresponding to the subsignals, and extracting interference eigenvectors corresponding to interference signals from the signal eigenvectors based on the eigenvalues; and obtaining a target reduction result for the interference signals according to the signal eigenvectors and the interference eigenvectors. With the method, the problem of low accuracy of radio astronomy interference signal reduction in the related art can be solved.

First claim

What is claimed is:

1. A radio astronomy interference signal reduction method, comprising:
acquiring at least two beam signals, and obtaining a covariance matrix between all the beam signals according to the beam signals, wherein the beam signals comprise subsignals from at least two directions;
performing eigen-decomposition processing on the covariance matrix to obtain signal eigenvectors and eigenvalues corresponding to the subsignals, and extracting interference eigenvectors corresponding to interference signals from the signal eigenvectors based on the eigenvalues;
obtaining a target reduction result for the interference signals according to the signal eigenvectors and the interference eigenvectors.

2. The method of claim 1 , wherein the interference eigenvectors form an interference subspace; and the obtaining the target reduction result for the interference signals according to the signal eigenvectors and the interference eigenvectors comprises:
calculating an interference subspace projection matrix based on the interference subspace;
performing projection transformation processing on the covariance matrix based on the interference subspace projection matrix to obtain a covariance projection matrix;
subtracting the covariance projection matrix from the covariance matrix to obtain the target reduction result.

3. The method of claim 2 , wherein the subtracting the covariance projection matrix from the covariance matrix to obtain the target reduction result comprises:
subtracting the covariance projection matrix from the covariance matrix to obtain a spatially filtered covariance matrix;
performing signal recovery processing based on the spatially filtered covariance matrix to obtain a de-interference beam signal, and obtaining the target reduction result based on the de-interference beam signal.

4. The method of claim 1 , wherein the extracting the interference eigenvectors corresponding to the interference signals from the signal eigenvectors based on the eigenvalues comprises:
acquiring a preset eigenvalue threshold;
comparing each of the eigenvalues with the preset eigenvalue threshold, determining interference eigenvalues from the eigenvalues based on comparison results, and determining the corresponding interference eigenvectors from the signal eigenvectors based on the interference eigenvalues.

5. The method of claim 1 , wherein the acquiring the at least two beam signals further comprises:
acquiring at least two initial beam signals;
performing system noise calibration processing on each of the initial beam signals to obtain the beam signals; wherein the system noise calibration processing comprises removing baselines in the beam signals.

6. The method of claim 1 , wherein the beam signals comprise frequency information, and the obtaining the covariance matrix between all the beam signals according to the beam signals comprises:
classifying the beam signals into at least one frequency channel according to the frequency information, and extracting frequency data corresponding to the frequency channel in the beam signals according to the frequency information; and inputting the frequency data into the corresponding frequency channel for calculation to obtain the covariance matrix.

7. The method of claim 1 , wherein the acquiring the at least two beam signals further comprises:
acquiring a preset time interval;
acquiring the at least two beam signals based on the preset time interval.

8. A radio astronomy interference signal reduction apparatus, comprising:
an acquisition module configured to acquire at least two beam signals, and obtain a covariance matrix between all the beam signals according to the beam signals, wherein the beam signals comprise subsignals from at least two directions;
a calculation module configured to perform eigen-decomposition processing on the covariance matrix to obtain signal eigenvectors and eigenvalues corresponding to the subsignals, and extract interference eigenvectors corresponding to interference signals from the signal eigenvectors based on the eigenvalues;
a generation module configured to obtain a target reduction result for the interference signals according to the signal eigenvectors and the interference eigenvectors.

9. A radio astronomy interference signal reduction system, comprising: a radio astronomy device and a main control device;
the radio astronomy device being configured to receive at least two beam signals and transmit the beam signals to the main control device;
the main control device being configured to perform steps of the method of claim 1 .

10. A computer device, comprising a memory and a processor, the memory storing a computer program, wherein the processor, when executing the computer program, implements steps of the method of claim 1 .

Assignees

• Zhejiang Lab

Inventors

• Wang Yu
• Duan Ran
• Feng Yi
• Li Di

Classifications

• H04B7/0857

  using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS] · CPC title

• H04B17/22

  for calibration of the receiver components · CPC title

• Y02D30/70

  in wireless communication networks · CPC title

• H04B1/1036

  with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters (H04B1/123 takes precedence; filter circuits H03H) · CPC title

• H04B7/043 Primary

  using best eigenmode, e.g. beam forming or beam steering · CPC title