Method for geolocating interference source in communication-based transport system

Patent metadata

Field	Value
Publication number	US-12372601-B2
Application number	US-202117918695-A
Country	US
Kind code	B2
Filing date	Apr 13, 2021
Priority date	Jun 5, 2020
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

A method for geolocating an interference source in a communication-based transport system, wherein the communication-based transport system comprises: —a plurality of interference sources, distributed in a space and respectively emitting signal, —a vehicle, moving along a known trajectory, receiving the signal from the interference sources, and measuring the signal strength of the signal of only one interference source at a time instance; the method comprising: —separating the interference sources by clustering the signal strength of the signal with a clustering method; —estimating the locations of the interference sources in the space based on the separated interference sources.

First claim

The invention claimed is:

1. A method for geolocating an interference source in a communication-based transport system, wherein the communication-based transport system comprises:
a plurality of interference sources, distributed in a space and respectively emitting signal,
a vehicle, moving along a known trajectory, receiving the signal from the interference sources, and measuring the signal strength of the signal of only one interference source at a time instance;
the method comprising:
separating the interference sources by clustering the signal strength of the signal with a clustering method;
estimating the locations of the interference sources in the space based on the separated interference sources.

2. The method according to claim 1 , wherein the communication-based transport system is a communications-based train control system, and the vehicle is a train.

3. The method according to claim 1 , wherein the known trajectory comprises known position, velocity and direction of the at least one vehicle.

4. The method according to claim 1 , wherein at any time instance, only one interference source emits the signal, so as to avoid collision between the interference sources.

5. The method according to claim 1 , wherein the interference sources emit signal using CSMA/CA or CSMA/CD protocols.

6. The method according to claim 1 , wherein the interference sources are randomly activated.

7. The method according to claim 1 , wherein separating the interference sources and estimating the location of the interference sources are iteratively applied.

8. The method according to claim 7 , wherein separating the interference sources uses K-mean clustering method, and estimating the location of the interference sources uses maximum-likelihood estimation.

9. The method according to claim 1 , wherein separating the interference sources and estimating the location of the interference sources are sequentially applied.

10. The method according to claim 9 , wherein separating the interference sources uses joint Bayesian clustering method, and estimating the location of the interference sources uses Maximum-A-Posteriori (MAP) estimation.

11. The method according to claim 10 , wherein separating the interference sources is progressively applied from a previous known knowledge of an interference source.

12. The method according to claim 11 , wherein the method further comprising:
geometrically dividing the measurements of the signal strength into successive clusters;
estimating the locations of the interference sources in one cluster;
exploiting the estimated locations of the interference sources in the cluster as the prior knowledge to another cluster in the successive clusters; and
filtering significant interference sources from a neighbour to another.

13. The method according to claim 11 , wherein the vehicle has a plurality of travels along the known trajectory, and the method further comprises:
estimating the locations of the interference sources in one travel;
exploiting the estimated locations of the interference sources in the travel as the prior knowledge to other travels.

14. A communication-based transport system for geolocating an interference source, wherein the communication-based transport system comprises:
a plurality of interference sources, distributed in a space and respectively emitting signal,
a vehicle, moving along a known trajectory and having a radio module, which is capable of receiving the signal from the interference sources and measuring the signal strength of the signal of only one interference source at a time instance;
a controller, configured to:
separate the interference sources by clustering the measured signal strength of the signal with clustering method;
estimate the location of the interference sources in the space by the separated interference sources.

15. A non-transitory computer readable medium storing a computer program comprising program code to be executed by a processor, the program code being adapted to performance of a method as claimed in claim 1 when executed by the processor.

Assignees

• Mitsubishi Electric Corp

Inventors

• Nguyen Viet Hoa
• Gresset Nicolas

Classifications

• H04B1/1027

  assessing signal quality or detecting noise/interference for the received signal · CPC title

• B61L25/025

  Absolute localisation, e.g. providing geodetic coordinates · CPC title

• B61L2027/204

  using Communication-based Train Control [CBTC] · CPC title

• B61L27/20

  Trackside control of safe travel of vehicle or train, e.g. braking curve calculation · CPC title

• G01S5/0249

  Determining position using measurements made by a non-stationary device other than the device whose position is being determined · CPC title