Method, system, and computer-readable medium comprising software code for communicating data from a transmitter to a receiver via a physical transmission medium, and related railway track circuit

Patent metadata

Field	Value
Publication number	US-11352033-B2
Application number	US-201916686533-A
Country	US
Kind code	B2
Filing date	Nov 18, 2019
Priority date	Nov 18, 2019
Publication date	Jun 7, 2022
Grant date	Jun 7, 2022

Abstract

Method and system for communicating data between a transmitter and a receiver via a physical transmission medium interposed there between, wherein the transmitter outputs over the transmission medium towards the receiver, a predefined precursor signal followed by a target signal carrying data packet. Based on the precursor signal received at the receiver, estimated values of actual electrical parameters of the physical transmission medium are computed via a predetermined model of the physical transmission medium, wherein the computed estimated values of the electrical parameters are indicative of a distortion caused by the physical transmission medium on the predefined precursor signal outputted by the transmitter. The data packets originally outputted by the transmitter are estimated based on the computed estimated values of the actual electrical parameters and on the target signal received at the receiver.

First claim

What is claimed is:

1. A method for communicating data between a transmitter and a receiver via a physical transmission medium interposed there between, the method comprising at least the following steps:
outputting, by the transmitter over said transmission medium towards the receiver, a predefined precursor signal followed by a target signal carrying at least one data packet;
based on the precursor signal received at the receiver, computing estimated values of one or more actual electrical parameters of the physical transmission medium via a predetermined model of the physical transmission medium, wherein the computed estimated values of said one or more actual electrical parameters are indicative of a distortion caused by the physical transmission medium on the predefined precursor signal outputted by the transmitter;
estimating the at least one data packet originally outputted by the transmitter based on at least the computed estimated values of the one or more actual electrical parameters of the physical transmission medium and the target signal received at the receiver.

2. The method for communicating data according to claim 1 , wherein said step of computing estimated values of one or more actual electrical parameters comprises computing estimated values of one or more actual electrical parameters of the physical transmission medium by modifying in real time one or more settings of the predetermined model of the physical transmission medium and correspondingly calculating one or more simulated received precursor signals in order to match the precursor signal received at the receiver with one of the simulated received precursor signals.

3. The method for communicating data according to claim 1 , wherein said step of computing estimated values of one or more actual electrical parameters comprises comparing the actual precursor signal received at the receiver with a table of received predefined precursor signals pre-computed by using the predetermined model of the physical transmission medium.

4. The method for communicating data according to claim 1 , wherein said step of estimating the at least one data packet originally outputted by the transmitter comprises applying at least one corrective coefficient indicative of a further distortion caused, by environmental noise external to and associated with the physical transmission medium, on the outputted predefined precursor signal and/or data packet.

5. The method for communicating data according to claim 1 , wherein the predefined precursor signal carries information independent from the at least one data packet carried by the target signal.

6. The method for communicating data according to claim 1 , wherein the predefined precursor signal and the target signal have corresponding shapes different from each other, the precursor signal having preferentially a different frequency spectrum than the target signal.

7. The method for communicating data according to claim 1 , wherein it comprises at least the further step of:
decoding the estimated at least one data packet originally outputted by the transmitter.

8. The method for communicating data according to claim 7 , wherein said step of decoding the estimated at least one data packet originally outputted by the transmitter comprises a first sub-step of parsing the estimated at least one data packet into a plurality of digital bits indicative of the data content outputted by the transmitter.

9. The method for communicating data according to claim 8 , wherein said step of decoding further comprises a second sub-step of validating the decoded estimated at least one data packet originally outputted by the transmitter and wherein, if the sub-step of validating fails, it further comprises recursively modifying the estimated values of the one or more actual electrical parameters of the physical transmission medium until the sub-step of validating succeeds.

10. The method for communicating data according to claim 1 , wherein said physical transmission medium include a track section of a track circuit comprising said transmitter and said receiver, said track section being formed by a plurality of rails, and wherein said step of computing estimated values of one or more actual electrical parameters of the physical transmission medium comprises computing one or more electrical parameters of the group comprising an electrical resistance of ballast associated with the track section, the electrical resistance of the rails forming the track section, the electrical inductance of the rails forming the track section, the electrical resistance of one or more wires of the track circuit, the electrical capacitance of the track section.

11. The method for communicating data according to claim 10 , wherein said step of outputting comprising using as the outputted predefined precursor signal a coded DC signal used by said track circuit for detecting the presence of a railway vehicle.

12. The method for communicating data according to claim 1 , wherein it comprises a step of calibrating the track circuit based on the actually computed estimated electrical parameters.

13. A computer-readable medium comprising software code stored therein which, when executed by a processor, execute or make execute a method according to claim 1 .

14. A system for communicating data, comprising at least:
a transmitter;
a receiver;
a physical transmission medium which is interposed between the transmitter and the receiver and is suitable to transmit signals outputted by the transmitter to the receiver; and
a controller;
wherein the transmitter is configured to transmit over said transmission medium towards the receiver, a predefined precursor signal followed by a target signal carrying at least one data packet; and
wherein the controller is configured to compute, based on the precursor signal received at the receiver, estimated values of one or more actual electrical parameters of the physical transmission medium via a predetermined model of the physical transmission medium, the computed estimated values of said one or more actual electrical parameters being indicative of a distortion caused by the physical transmission medium on the predefined precursor signal outputted by the transmitter, the controller being further configured to estimate the at least one data packet originally outputted by the transmitter based on at least the computed estimated values of the one or more actual electrical parameters of the physical transmission medium and the target signal received at the receiver.

15. A track circuit for a railway line, comprising at least:
a plurality of rails coupled to form a track section having a predefined length;
a transmitter coupled to the track section at a first end of the track section, the transmitter being configured to output over said track section a predefined precursor signal followed by a target signal carrying at least one data packet;
a receiver coupled to the track section at a second end of the track section, the receiver being configured to receive the precursor signal followed by the target signal outputted by the transmitter and transmitted via the track section;
a controller configured to compute, based on the precursor signal received at the receiver, estimated values of one or more actual electrical parameters of the track section via a predetermined model of the track section, the computed estimated values of said one or more actual electrical parameters being indicative of a distortion caused by the track section on the predefined precursor signal outputted by the transmitter, the controller being further configured to estimate

Assignees

• Alstom Transp Tech

Inventors

• Ross John
• Fries Jeffrey

Classifications

• H04B3/60 Primary

  Systems for communication between relatively movable stations, e.g. for communication with lift (H04B3/54 takes precedence) · CPC title

• H04L12/40045

  Details regarding the feeding of energy to the node from the bus · CPC title

• B61L1/188 Primary

  Use of coded current · CPC title

• B61L15/0036

  Conductor-based, e.g. using CAN-Bus, train-line or optical fibres · CPC title

• B61L15/0072

  On-board train data handling · CPC title