RU39561U1 - TONAL RAIL CHAIN RECEIVER - Google Patents

Abstract

The utility model relates to devices of railway automation and telemechanics, namely to receivers of tonal rail circuits that monitor the condition of the railway track. The tone rail circuit receiver comprises a first bandpass filter, an amplitude demodulator, an amplitude limiter, a first buffer stage, a second bandpass filter, a second buffer stage, a first solver, an amplifier, a third bandpass filter, a rectifier, a second solver, and the output of the bandpass filter is connected to the input buffer cascade, the output of which is connected to the input of the demodulator, the output of which is connected to the input of the first solver, the output of the latter through the amplifier is connected to the input of the second solver separating apparatus. It additionally includes a symmetric amplitude limiter, a frequency demodulator, a shift register, a phase-locked loop, a digital comparator, an expected codeword block and a key, the input of a symmetric amplitude limiter connected to the output of the first band-pass filter, the input of the frequency demodulator connected to the output of a symmetric amplitude limiter, the first input of the shift register is connected to the output of the frequency demodulator, the input of the phase locked loop is connected to the output of the frequency demodulator, and the output is to the second input of the shift register, the first input of the digital comparator is connected to the output of the shift register, the output of the expected codeword block is connected to the second input of the digital comparator, the first key input is connected to the output of the digital comparator, the second to the output of the first decoding device, the output which

Description

The utility model relates to devices of railway automation and telemechanics, namely to receivers of tonal rail circuits that monitor the condition of the railway track.

A known tone rail circuit receiver comprising a first bandpass filter, an amplitude demodulator, an amplitude limiter, a first buffer stage, a second bandpass filter, a second buffer stage, a first solver, an amplifier, a third bandpass filter, a rectifier, and a second solver.

The first bandpass filter, which is the input bandpass filter, extracts the carrier signal of the tone rail circuit, the amplitude demodulator extracts the modulating frequency from the carrier signal of the rail circuit, the amplitude limiter stabilizes the sensitivity of the receiver, the first buffer stage matches the output of the amplitude limiter with the input of the second bandpass filter, the second bandpass filter suppresses stray products of demodulation and amplitude limitation and isolates the modulating signal of the rail circuit, the second buffer The cascade matches the output of the bandpass filter with the input of the first solver, the first solver detects the presence of a rail signal, the amplifier amplifies the output signal of the first solver, and the third bandpass filter conductively decouples the output of the amplifier and the input of the second solver and suppresses the industrial frequency currents and its harmonics , the rectifier selects the constant component of the signal at the output of the third band-pass filter, the second solver takes the final availability statement

(absence) of a tone rail signal at the receiver input. (Methodological materials for the course "Devices, operation and maintenance of automatic locking systems with tonal frequency rail circuits." - GUL VNIIAS MPS of Russia, M., 2001).

The disadvantage of this tonal rail circuit receiver is that it has insufficient electromagnetic compatibility with transmitters of adjacent and adjacent tonal rail circuits, as well as a relatively low noise immunity to various kinds of interference, for example, from traction current and parallel railway automation and telemechanics systems, which It is connected with the amplitude modulation and detection method of the tone rail circuit signal.

This technical solution is selected as a prototype.

The technical result of the proposed device is to increase the reliability of information about the state of the monitored sections of the track by increasing the level of its electromagnetic compatibility and noise immunity.

The technical result is achieved by the fact that in the receiver of the tone rail circuit containing a bandpass filter, a buffer stage, an amplitude demodulator, a first solver, an amplifier, a second solver, the output of the bandpass filter is connected to the input of the buffer stage, the output of which is connected to the input of the demodulator, the output which is connected to the input of the first solver, the output of the latter through an amplifier is connected to the input of the second solver, a symmetric amplitude limit is additionally introduced b, the input of which is connected to the output of the bandpass filter; frequency demodulator, the input of which is connected to the output of a symmetric amplitude limiter; shift register, the first input of which is connected to the output of the frequency

demodulator; a phase locked loop, the input of which is connected to the output of the frequency demodulator, and the output to the second input of the shift register; a digital comparator, the first input of which is connected to the output of the shift register; an expected codeword block, the output of which is connected to the second input of the digital comparator; a key, the first input of which is connected to the output of the digital comparator, the second to the output of the first solver, and the output through the amplifier to the input of the second solver.

The drawing shows a functional diagram of the receiver tone rail circuit.

The receiver of the tone rail circuit contains a bandpass filter 1, a buffer stage 2, an amplitude demodulator 3, a first solver 4, a key 5, a symmetric amplitude limiter 6, a frequency demodulator 7, a shift register 8, a phase locked loop 9, a digital comparator 10, an expected block codeword 11, amplifier 12, second resolver 13.

The receiver tone rail circuit operates as follows. The signal of the tone rail circuit is fed to the input of the bandpass filter 1, which selects the carrier signal of the tone rail circuit. From the output of the bandpass filter 1, the signal is fed to the input of the amplitude demodulator 3 through the buffer stage 2 and to the input of the symmetric amplitude limiter 6. The signal from the output of the amplitude demodulator 3 is fed to the input of the first solver 4, which makes a decision on the presence or absence of the carrier signal of the tone rail circuit and in accordance with this controls the key 5.

The signal from the output of the symmetric amplitude limiter 6, which suppresses spurious filtering products, is fed to the input of the frequency demodulator 7, which, in turn, extracts the code component of the signal of the tone rail circuit. From the output of the frequency

demodulator 7, the signal is fed to the first input of the shift register 8 and to the input of the phase locked loop 9. The phase locked loop 9 extracts a clock signal from the received code component, by which the code word is entered into shift register 8. From the output of shift register 8, the received code word is received to the first input of the digital comparator 10, which compares it with the code word recorded in the block of the expected code word 11. When the received code word coincides with the expected signal from the output of the digital comparator 10 and is supplied to the second input switch 5.

If the first solver 4 makes a decision on the presence of a carrier signal at the input of the receiver, the key 5 is opened and the signal from the output of the digital comparator 10 is fed through an amplifier 12 to the input of the second solver 13, which makes the final decision on the presence (absence) of the tone rail circuit signal on receiver input.

The inventive receiver rail rail circuit can be successfully used in devices with automatic locking rail rail circuits.

The use of the proposed receiver rail track circuit will improve the stability of the systems of interval regulation of train traffic.

Claims (1)

A tone rail circuit receiver comprising a first bandpass filter, an amplitude demodulator, an amplitude limiter, a first buffer stage, a second bandpass filter, a second buffer stage, a first solver, an amplifier, a third bandpass filter, a rectifier, a second solver, the output of the bandpass filter being connected to the input of the buffer stage, the output of which is connected to the input of the demodulator, the output of which is connected to the input of the first solver, the output of the latter through the amplifier is connected to the input of the second a computing device, characterized in that it additionally includes a symmetric amplitude limiter, a frequency demodulator, a shift register, a phase-locked loop, a digital comparator, an expected codeword block and a key, the input of a symmetric amplitude limiter connected to the output of the first band-pass filter, the input of the frequency the demodulator is connected to the output of the symmetric amplitude limiter, the first input of the shift register is connected to the output of the frequency demodulator, the input of the phase self-sustaining unit frequency clock is connected to the output of the frequency demodulator, and the output is to the second input of the shift register, the first input of the digital comparator is connected to the output of the shift register, the output of the expected codeword block is connected to the second input of the digital comparator, the first key input is connected to the output of the digital comparator, the second to the output of the first solver, the output of which is connected through an amplifier to the input of the second solver.