Research on the algorithm of identifying track circuit occupation in simulation platform of high-speed train control system

In the simulation platform of high-speed train control system, it is necessary to simulate the track circuit occupation in order to provide basic conditions for other simulated equipment to calculate movement authority or generate track circuit code. A problem with the simulation of track circuit is that there may be more than one track circuit sections corresponding to one kilometer post. To solve this problem, this paper proposes an algorithm to precisely identify the occupied track circuit sections. In this algorithm, by using the signal machine as a reference origin, in combination with the the route information received from the simulated computer based interlocking equipment, train mileage is increased or decreased based on train running direction to find the occupied track circuit sections. The reference origin is always changing and the occupied track circuits inside or outside the station are identified by a unified “route”. This algorithm can find the occupied track circuit in a route of any complexity and reduce the accumulated error by using the changing reference origin and clearing the train mileage, thus solving the difference between the real and simulated track circuit. This algorithm reduces the complexity of simulating the occupation state of track circuit and lays a foundation for the construction of high-speed train control system simulation platform.