Wayside to railway vehicle communication method and device
A wayside to railway vehicle communication method including providing a first wayside device with a transmitter device capable of transmitting a data packet message to a railway vehicle travelling along a section of a railway track, through an electric waveform put into a rail of the section, and sending at least one message from the transmitter device to the railway vehicle, wherein the at least one message corresponds to the conversion of the data packet into a modulated electric waveform, the data packet including several data bits providing information relative to a plurality of speed limits the railway vehicle has to respect while travelling along respective portions of the section.
1. A wayside to railway vehicle communication method comprising transmitting, by a wayside device to a railway vehicle travelling along a section of a railway track, through an electric waveform put into a rail of the section, at least one message corresponding to a conversion of a data packet into a modulated electric waveform, the data packet including several data bits providing information relative to a plurality of speed limits the railway vehicle has to respect while travelling along respective portions of the section, and wherein the at least one message comprises: Block ID, Block Speed, End Speed, wherein Block ID represents a unique identifier for the section, and Block Speed and End Speed represent the allowable speed at an entry and end points of the section, respectively.
2. The wayside to railway vehicle communication method according to claim 1 , wherein the at least one message further comprises Work Zone Present, Work Zone Location, Work Zone Speed, wherein Work Zone Present, Work Zone Location and Work Zone Speed identify if there is a speed restriction area related to railway workers on the section, the relative location of the area within the section, and speed limit within the area respectively.
3. The wayside to railway vehicle communication method according to claim 1 , wherein the modulated electric waveform comprises a series of offset root raised cosine (RRC) pulses.
4. The wayside to railway vehicle communication method according to claim 3 , wherein the modulated electric waveform comprises twenty-two RRC pulses with each pulse modulated by four levels, to support two data bits per pulse, so that the data packet of the transmitted message contains 44 data bits.
5. The wayside to railway vehicle communication method according to claim 3 , wherein the modulated electric waveform comprises twenty-two RRC pulses with each pulse modulated by M levels, M being greater than four.
6. The wayside to railway vehicle communication method according to claim 1 , further comprising line coding on the modulated electric waveform to remove DC from the modulated electric waveform.
7. The wayside to railway vehicle communication method according to claim 1 , wherein the modulated electric waveform is further modulated with a carrier frequency applicable to a length of a track circuit associated with the section.
8. The wayside to railway vehicle communication method according to claim 1 , further including splitting the data bits into a first stream of bits applied to a first intermediate waveform running at one half of the symbol rate of the modulated electric waveform and then modulated with a sine wave carrier, and into a second stream of bits applied to a second intermediate waveform running at one half of the symbol rate and then modulated with a cosine wave carrier.
9. The wayside to railway vehicle communication method according to claim 8 , wherein the first and the second stream of bits each contain the same number of bits.
10. A wayside communication device comprising a transmitter transmitting to a railway vehicle travelling along a section of a railway track, through an electric waveform put into a rail of the section, at least one message corresponding to a conversion of a data packet into a modulated electric waveform, the data packet including several data bits providing information relative to a plurality of speed limits the railway vehicle has to respect while travelling along respective portions of the section, and wherein the at least one message comprises: Block ID, Block Speed, End Speed, wherein Block ID represents a unique identifier for the section, and Block Speed and End Speed represent the allowable speed at an entry and end points of the section, respectively.
11. A wayside to railway vehicle communication method comprising transmitting, by a wayside device to a railway vehicle travelling along a section of a railway track, through an electric waveform put into a rail of the section, at least one message corresponding to a conversion of a data packet into a modulated electric waveform, the data packet including several data bits providing information relative to a plurality of speed limits the railway vehicle has to respect while travelling along respective portions of the section, wherein the modulated electric waveform is further modulated with a carrier frequency applicable to a length of a track circuit associated with the section.
12. A wayside communication device comprising a transmitter transmitting to a railway vehicle travelling along a section of a railway track, through an electric waveform put into a rail of the section, at least one message corresponding to a conversion of a data packet into a modulated electric waveform, the data packet including several data bits providing information relative to a plurality of speed limits the railway vehicle has to respect while travelling along respective portions of the section, wherein the modulated electric waveform is further modulated with a carrier frequency applicable to a length of a track circuit associated with the section.