Moving block signaling headway calculation system

1. A moving block signaling headway calculation system that calculates a headway value in a running section of a train whose operation is controlled irrespective of blockage, the system comprising:

a processor; and

a memory electrically coupled to the processor and configured to store instructions executable by the processor,

wherein the processor is configured to:

acquire calculation distance interval data, refinement granularity data and headway value variation amount threshold value data, the calculation distance interval data representing a reference value of an interval between points at which a headway value is to be calculated, the refinement granularity data representing a limit value with which the interval is allowed to be subdivided, the headway value variation amount threshold value data representing a threshold value of an amount of variation in headway value between adjacent two points; and

obtain a headway value distribution curve in the running section by:

setting the reference value represented by the calculation distance interval data to the interval as an initial value; and

recursively executing a process until the interval reaches a limit value indicated by the refinement granularity data, the process including;

calculating headway values for a plurality of points on the running section for each interval;

extracting a section between the adjacent two points, in which an amount of variation in the headway values between the adjacent two points exceeds the threshold value represented by the headway value variation amount threshold value data, a section between the adjacent two points before and after a front point and an end point of a point or a section where a headway value changes from rise to fall, or a section between the adjacent two points before and after a front point and an end point of a point or a section where a headway value changes from fall to rise; and

subdividing the interval in the extracted sections to calculate the headway value.

2. The moving block signaling headway calculation system of claim 1 , wherein the processor is further configured to input a calculation condition of headway value by presenting a screen to set the calculation condition, the calculation condition including the calculation distance interval data, the refinement granularity data, and the headway value variation amount threshold value data.

3. The moving block signaling headway calculation system of claim 1 , wherein the processor is further configured to present a screen on which a headway value distribution curve of the running section is placed, the headway value distribution curve being obtained from the headway values calculated by the headway value calculator and being placed on the screen while a first axis represents a distance and a second axis represents orthogonal to the first axis represents time.

4. The moving block signaling headway calculation system of claim 3 , wherein the processor is further configured to place a list of headway values on the screen together with the headway value distribution curve, the headway values being calculated at different intervals within the running section by the headway value calculator.

5. The moving block signaling headway calculation system of claim 4 , wherein the processor is further configured to place a train performance curve of the running section on the screen together with the headway value distribution curve and the list of headway values, the train performance curve being placed on the screen while the first axis represents a distance and the second axis represents a speed.