Method for geolocating interference source in communication-based transport system
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.
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.