Research And Implementation Of Software Algorithm For All Electronic High-voltage Impulse Track Circuit Receiver

In the electrified section of track circuit, the track circuit to ensure that whether the trainoccupies in the section or the station, and reflect the cleared state of track circuit, it not only isone of the important facilities in relation to the railway transportation and traffic safety, butalso is the important interlocking equipment of railway signal and communication system inthe station. High voltage pulse track circuit relative to the existing line track circuit, itsstability, anti-interference ability and shunting sensitivity are better, and improve thereliability and safety of track circuit. The high voltage pulse track circuit is used widely in theelectrified section that it has the few quantity of travelling, the rail surface has seriouscorrosion, and the ballast resistance is higher. although it has many advantages, there is existsome defects that cannot be ignored, the main problem is that when the sending end has noload, the higher pressure can cause damage to components that it effects the normal sendingcode, two element two position differential relay of receiver is mechanized, so its reliabilityand security will be relatively lower, so it has been unable to meet the current needs of trackcircuit.Paper aimed at some defects and shortcomings as mentioned above, it improves thestructure of track circuit receiver, the transmitting end and the receiving end of the trackcircuit are connected through the sensor, to form a closed-loop system, and it can improve thereliability. Electronizes the receiver module of track circuit, to replace some mechanizedmodule, and improve the work performance. Simulating the track circuit receiver by usingfast algorithm of software, arithmetic speed is faster, high accuracy can correctly reflect thecleared or occupation conditions of track section, the reliability and safety are higher, whichalso complies with the development needs of modern railway communication signals.This paper through the research of the software algorithm to realize the track circuitreceiver, the receiver has been optimized from the system structure, one sensor is connectedbetween the transmitting end and the receiving end, and the sensor receives the pulse signalfrom the sending end and sends to the receiving end. So pulse signal receiving end receivesthe pulse signal from the sensor and from the track circuit which have the same operation, andthen the two kinds of signals are compared and output. Therefore, the focus of this thesis ondesigning two sets of the CPU of receiver, and the two sets of CPU use two different softwarealgorithm which are called FFT algorithm and Mallat algorithm, both of them use the fastalgorithm, the processing speed is faster, high accuracy, good real-time performance, highreliability. Also need to filter the high voltage pulse signal, which is the essential link, aButterworth filter and Chebyshev filter separately on the50HZ harmonic and some clutter,and those algorithms are analyzed. The theory and method which is put forward in this paper complete the electronic designof high-voltage pulse track circuit receiver, and the anti-jamming analysis, the conclusionshows that the scheme is feasible, the degree of automation compared to the originalequipment is much faster, the maintenance speed is much higher, and it will have a goodapplication prospect.