Railway code generation and signaling system and method

摘要

A first unit configured to generate and transmit a code of positive and negative DC pulses through a first rail of a railway. A second unit spaced from the first unit and configured to sense the code, which includes a leading code word, having a positive or negative timing pulse followed after a first data interval by a positive or negative data pulse, followed by a modifying code word. The modifying code word consists of a second positive or negative timing pulse followed after a second data interval by a second positive or negative data pulse. The second timing pulse starts after one code cycle from the start of the leading code word timing pulse. The second timing pulse and the second data pulse duplicate the timing pulse and the data pulse of the same polarity, but invert the timing pulse and the data pulse of opposite polarities.

主权项

1. A system comprising:
a track section, which is made up of two parallel rails, a first unit configured for connection to at least one rail of the track section and further configured to generate and transmit a tandem message of positive and negative DC pulses through the at least one rail for reception by a spaced-apart second unit connected to the at least one rail; wherein the first unit is configured to transmit the tandem message as comprising a leading code word followed by a modifying code word, the modifying word being required by the second unit for confirming validity of the leading code word and for completing the meaning of the tandem message, the leading code word comprises a first positive or negative timing pulse followed after a first data interval by a first positive or negative data pulse, the modifying code word comprises a second positive or negative timing pulse followed after a second data interval by a second positive or negative data pulse, the second positive or negative timing pulse starting after a time delay of one code cycle from the start of the first timing pulse of the leading code word, in case the first timing pulse and the first data pulse are of a same polarity then the second data interval and the second data pulse are duplicates of the first data interval and the first data pulse, and in case the first timing pulse and the first data pulse are of an opposite polarity then the second timing pulse and the second data pulse are of opposite polarities from, respectively, the first timing pulse and the first data pulse the second unit is able to validate that each tandem message comes from the same track section and to read the meaning of each tandem message on the basis of the time delay of the code cycle and of the polarities of the second timing pulse and of the second data pulse.