Methods and system of automating track circuit calibration

A track circuit comprising:

• a receive processing unit coupled to a first end of a track section;
• wherein the receive processing unit is configured to receive a current signal over the track section, the current signal related to a voltage signal applied to the track section by a transmit processing unit coupled to a second end of the track section and a leakage resistance between the first end and the second end of the track section;
• and
• wherein the receive processing unit is configured to transmit to the transmit processing unit a communication corresponding to a status of the leakage resistance, the communication including a pulse pair signal.

A track circuit comprising:

• a transmit processing unit coupled to a first end of a track section;
• wherein the transmit processing unit is configured to apply a voltage signal to the track section for reception of a current signal corresponding to the voltage signal by a receive processing unit coupled to a second end of the track section;
• wherein the transmit processing unit is configured to receive a communication from the receive processing unit corresponding to a status of a leakage resistance between the first end and the second end of the track section, the communication including a pulse pair signal;
• and
• wherein the transmit processing unit is configured to adjust the voltage signal based on the pulse pair signal received from the receive processing unit to compensate for the leakage resistance.

A track circuit comprising:

• a remote system;
• and
• a transmit processing unit and a receive processing unit, said remote system configured for communication with at least one of said transmit processing unit or said receive processing unit;
• wherein the transmit processing unit is coupled to a first end of a track section, the track section comprising a plurality of rails coupled in series and having the first end and a second end, and wherein the receive processing unit is coupled to the second end of the track section;
• said transmit processing unit configured to apply a first voltage to said track section during a track circuit calibration operation, said receive processing unit configured to detect a first current related to the first voltage and a leakage resistance between the first end and the second end, said receive processing unit configured to transmit a pulse pair to the transmit processing unit indicative of a state of adjustment necessary in said first voltage to compensate for the leakage resistance;
• and
• said receive processing unit configured to timingly separate the pulses of said pulse pair, the timing of the separation indicating a status of the first current relative to a predetermined range.

A track circuit comprising:

• a transmit processing unit and a receive processing unit for cooperatively monitoring and calibrating a track circuit, said transmit processing unit coupled to a first end of a track section, and said receive processing unit coupled to a second end of the track section;
• said transmit processing unit configured to apply a first voltage to said track section, said receive processing unit configured to detect a first current related to the first voltage and a leakage resistance between the first end and the second end of the track section;
• said receive processing unit being configured to transmit a pulse pair signal to said transmit processing unit indicating the status of the first current relative to a predetermined range;
• and
• said transmit processing unit configured to apply a different, second voltage to said track section if the first current is outside the predetermined range.