METHOD AND APPARATUS FOR ESTIMATING LOCATION OF SIGNAL SOURCE

• US 20200132800A1
• Filed: 08/15/2019
• Published: 04/30/2020
• Est. Priority Date: 10/30/2018
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: KIM, JUNG-BIN
• Granted Patent: US 11,079,465 B2
• Time in Patent Office: Days
• CPC Class Codes: G01S 3/46 using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems
• CPC Class Codes: G01S 3/74 Multi-channel systems specially adapted for direction-finding, i.e. having a single antenna system capable of giving simultaneous indications of the directions of different signals systems in which the directions of different signals are determined sequentially and displayed simultaneously G01S3/04, G01S3/14
• CPC Class Codes: G01S 5/04 Position of source determined by a plurality of spaced direction-finders
• CPC Class Codes: H04B 7/028 Spatial transmit diversity using a single antenna at the transmitter
• CPC Class Codes: H04B 7/0482 Adaptive codebooks
• CPC Class Codes: H04W 64/003 locating network equipment

Abstract

Disclosed is a method and apparatus for estimating a signal source, the method including receiving, in at least one receiving node, a signal emitted from a signal source, extracting a steering matrix corresponding to a virtual antenna array by vectorizing the signal received in the at least one receiving node, and estimating a location of the signal source based on the steering matrix.

Claims

1. A method of estimating a location of a signal source, the method comprising:

receiving, in at least one receiving node, a signal emitted from a signal source;

extracting a steering matrix corresponding to a virtual antenna array by vectorizing the signal received in the at least one receiving node; and

estimating a location of the signal source based on the steering matrix.

2. The method of claim 1, wherein the extracting comprises:

calculating a coefficient included in the steering matrix based on information on a reception location in which the signal is received by the at least one receiving node and an electromagnetic-wave propagation model; and

extracting the steering matrix based on the coefficient.

3. The method of claim 2, wherein the calculating comprises:

calculating a distance between the reception location and each of candidate locations of the signal source;

calculating a phase of the coefficient; and

calculating a magnitude of the coefficient using the distance and the electromagnetic-wave propagation model.

4. The method of claim 3, wherein the calculating of the phase comprises:

calculating the phase based on a carrier frequency of the signal source, a propagation time of the signal, and a propagation speed of the signal.

5. The method of claim 3, wherein the calculating of the magnitude comprises:

calculating a magnitude of the coefficient using a pathloss model based on the distance.

6. The method of claim 1, wherein the extracting comprises:

calculating a coefficient included in the steering matrix based on a reference signal received from the signal source; and

extracting the steering matrix based on the coefficient.

7. The method of claim 6, wherein the calculating of the coefficient comprises:

calculating the coefficient by periodically or aperiodically receiving a constant signal corresponding to the reception location based on an orthogonal or non-orthogonal method.

8. The method of claim 1, wherein the extracting comprises:

vectorizing the signal by time shift of the signal when a difference between distances from the signal source to the at least one receiving node is greater than or equal to a predetermined value.

9. The method of claim 1, wherein the estimating comprises:

calculating a covariance matrix from a time sample of the vectorized signal;

extracting an eigenvalue and an eigenvector from the covariance matrix; and

estimating a location of the signal source based on the eigenvector and the steering matrix.

10. The method of claim 9, wherein the estimating of the location of the signal source based on the eigenvector comprises:

estimating, as a location of the signal source, a point corresponding to a peak value of a spatial power spectrum based on the steering matrix and the eigenvector.

11. An apparatus for estimating a location of a signal source, the apparatus comprising:

a receiver configured to receive, in at least one receiving node, a signal emitted from a signal source; and

a processor configured to extract a steering matrix corresponding to a virtual antenna array by vectorizing the signal received in the at least one receiving node and estimate a location of the signal source based on the steering matrix.

12. The apparatus of claim 11, wherein the processor is configured to calculate a coefficient included in the steering matrix based on information on a reception location in which the signal is received by the at least one receiving node and an electromagnetic-wave propagation model, and extract the steering matrix based on the coefficient.

13. The apparatus of claim 12, wherein the processor is configured to calculate a distance between the reception location and each of candidate locations of the signal source, calculate a phase of the coefficient, and calculate a magnitude of the coefficient using the distance and the electromagnetic-wave propagation model.

14. The apparatus of claim 13, wherein the processor is configured to calculate the phase based on a carrier frequency of the signal source, a propagation time of the signal, and a propagation speed of the signal.

15. The apparatus of claim 13, wherein the processor is configured to calculate a magnitude of the coefficient using a pathloss model based on the distance.

16. The apparatus of claim 11, wherein the processor is configured to calculate a coefficient included in the steering matrix based on a reference signal received from the signal source and extract the steering matrix based on the coefficient.

17. The apparatus of claim 16, wherein the processor is configured to calculate the coefficient by periodically or aperiodically receiving a constant signal corresponding to the reception location based on an orthogonal or non-orthogonal method.

18. The apparatus of claim 11, wherein the processor is configured to vectorize the signal by time shift of the signal when a difference between distances from the signal source to the at least one receiving node is greater than or equal to a predetermined value.

19. The apparatus of claim 17, wherein the processor is configured to calculate a covariance matrix from a time sample of the vectorized signal, extract an eigenvalue and an eigenvector from the covariance matrix, and estimate a location of the signal source based on the eigenvector and the steering matrix.

20. The apparatus of claim 19, wherein the processor is configured to estimate, as a location of the signal source, a point corresponding to a peak value of a spatial power spectrum based on the steering matrix and the eigenvector.