RU2278795C2 - Device for measuring parameters of signals of automatic cab signaling - Google Patents

Abstract

FIELD: railway transport; signaling and communication.

SUBSTANCE: invention relates to devices for measuring parameters of signals of continuously-controlled automatic cab signaling and common continuously-controlled automatic cab signaling. Device has channel for separation of envelope of ac pulses, time interval duration selector, pulse shaper, reset device, two counters, decoder, three multiplexers, second counter control device, standard frequency generator, code converter unit, indicator device, signal preliminary processing channel, control unit, three permanent memories, summer, switch, register and correlator. Channel for separation of envelope of ac pulses consists of analog-digital converter, digital band-pass filter, module calculation unit digital low-frequency filter, second multiplexer, threshold calculation unit and digital threshold device. Channel for preliminary processing of signals includes intake device, attenuator, low-frequency filter, third multiplexer, control unit, analog-digital converter and automating amplification control unit.

EFFECT: improved accuracy of measurements, enlarged functional capabilities of device owing to provision of decoding of coded signals of continuously-controlled automatic cab signaling and decoding and indication of coded signals of common continuously-controlled automatic cab signaling and indication of characteristics of motion.

2 cl, 1 dwg

Description

The invention relates to railway automation, and in particular to devices for measuring the parameters of automatic locomotive signaling ALSN and multi-valued automatic locomotive signaling ALS-EN.

Known devices for measuring the parameters of the signals ALSN (1, 2). Their common disadvantages are the lack of accuracy in measuring time intervals associated with the use of the differentiation mechanism of the leading and trailing edges of the signals to determine their duration, and limited functionality due to the lack of decoding of the ALSN system fire code signals and the inability to decode and indicate the type of code signals and display motion indicators multi-valued automatic locomotive signaling continuous ALS-EN. In addition, the device (2) is characterized by the complexity of processing the input signal.

A device for measuring the time parameters of the numerical code ALSN (3). It has the following disadvantages:

- measurement of the time parameters of the ALSN signals in the form of AC voltage pulses is not provided;

- decoding of ALSN fire code signals is not provided.

As a prototype of the claimed technical solution, a device for measuring the temporal parameters of pulse code signals was selected, which contains an ac pulse envelope extraction unit, a pulse shaper of the edges of the signal and its edges, the first and second delay elements, a pulse distributor containing a counter and a decoder, a switch (multiplexer) , the selector of the longest time interval between the pulses of the signal under study, the synchronization trigger and the coincidence block forming the functions On the other hand, a pulse distributor counter reset device, a cycle trigger, a time interval generator, a pulse generation unit with a reference frequency, an indication unit containing a counter, a code conversion device and an indicator, and a control unit that performs the counter control functions of the indication unit (4).

The known device allows you to measure the time parameters of the code signals of an automatic locomotive signaling continuous type ALSN.

The disadvantages of the prototype device are the lack of accuracy in measuring the time parameters of the ALSN system code signals, due to the lack of correction of the duration of time intervals, and the limited functionality due to the lack of decoding of ALSN fire code signals and the inability to decode and display code signals and display motion indicators of a multi-valued automatic locomotive signaling ALS-EN.

The problem solved by the invention is to increase the accuracy of measuring the time parameters of ALSN code signals and expand the functionality of the device by providing decoding ALSN fire code signals and decoding and indicating code signals and indicating ALS-EN motion indicators.

This problem is solved in that the device for measuring the parameters of the automatic locomotive signaling, comprising a channel for emitting an envelope of alternating current pulses, the output of which is connected to the inputs of a selector for the duration of time intervals and a pulse shaper, and the output of the selector for the duration of time intervals is connected to the first input of the reset device, the output of which connected to the input of the installation in "0" of the first counter, and the output of the pulse shaper is connected to the counting input of the first counter, with connected to the output of the decoder, the output of which is connected to the first input of the first multiplexer, connected by the output to the first input of the second counter control device, the second input of which is connected to the output of the reference frequency generator, the first output is connected to the counting input of the second counter, and the second output is connected to the input setting to “0” a second counter, a code conversion unit and an indicator device, equipped with a signal preprocessing channel; the channel for enveloping the envelope of AC pulses is made in the form of an analog-to-digital converter, the input of which is the input of the device, and the output is connected to the first input of the digital bandpass filter, the output of which is connected to the input of the module calculation unit, a digital low-pass filter, the input connected to the output of the calculation unit module, and the output to the first input of the second multiplexer, the second input of which is connected to the output of the analog-to-digital converter, and the output is connected to the input of the threshold calculation unit and the first the input of the digital threshold device, the second input of which is connected to the output of the threshold calculation unit, and the output is the output of said channel; in addition, the device is equipped with a control unit, the input of which is connected to the output of the reference frequency generator, the first output is connected to the second input of the digital bandpass filter, the second output is connected to the third input of the second multiplexer, and the third output is connected to the second input of the first multiplexer and the input of the first permanent memory a device whose output is connected to the first input of the adder, the second input of which is connected to the output of the second counter; a switch, the first input of which is connected to the fourth output of the control unit, and the second input to the output of the adder; a register, the data input of which is connected to the output of the first counter, the recording input is connected to the output of the selector for the duration of time intervals, and the output is connected to the third input of the switch; a correlator, the first input of which is connected to the output of the digital band-pass filter, the second input is connected to the output of the second read-only memory, and the output is connected to the input of the third read-only memory and the fourth input of the switch, the fifth input of which is connected to the output of the third read-only memory, the switch is connected to the input of the code converter block, the output of which is connected to the indicator device, and the second input of the reset device is connected to the digital output th threshold device. The signal pre-processing channel includes an input device, the output of which is connected to the first input of the attenuator; low-pass filter, the input of which is connected to the output of the attenuator; the third multiplexer, the first input of which is connected to the output of the low-pass filter, the second input is connected to the output of the attenuator, the third input is connected to the second output of the control unit, and the output is connected to the input of the analog-to-digital converter of the channel for selecting the envelope of alternating current pulses of an alternating current, and the automatic gain control unit connected by the input to the output of the analog-to-digital converter, and the output - with the second input of the attenuator.

The invention is illustrated in the drawing, which shows a structural electrical diagram of the inventive device.

A device for measuring parameters of a locomotive signaling system of a continuous type includes an input device 1, an attenuator 2, a low-pass filter (LPF) 3, a third multiplexer 4, an analog-to-digital converter (ADC) 5, an automatic gain control unit (AGC) 6, a digital bandpass filter ( CPF) 7, module 8 calculation unit, digital low-pass filter (DSP) 9, second multiplexer 10, digital threshold device 11, threshold calculation unit 12, time interval selector 13, reset device 14, pulse shaper 15, per a high counter 16, a decoder 17, a first multiplexer 18, an “I” element 19, a reset pulse generator 20, a second counter 21, an adder 22, a register 23, a reference frequency generator 24, a control unit 25, a first read-only memory (ROM) 26, second ROM 27, correlator 28, third ROM 29, switch 30, code conversion unit 31, display 32.

The inventive device operates as follows.

1. The mode of measuring the time parameters of the ALSN code signals. The ALSN input code signal in the form of pulses of direct current or in the form of pulses of alternating current with a frequency of 25 Hz, 50 Hz or 75 Hz, generated by railway automation devices, is fed to the input of input device 1, the functions of which include overvoltage protection and primary analog signal filtering . The control unit 25 switches the multiplexers 4, 10 and 18, creating the corresponding circuits for the passage of pulses of direct and alternating current, regulates the central frequency of the DSP 7 and switches the switch 30 to the measurement mode of the time parameters of the ALSN code signals. From the output of the input device 1, the signal enters the attenuator 2, which serves to control the attenuation of the input signal and match the input signal range with the ADC conversion range 5. In LPF 3, the signal is pre-filtered and output from the LPF 3 is fed to the first input of multiplexer 4. If the input signal is a DC pulse, the signal from the output of the attenuator 2 is fed directly to the second input of the multiplexer 4, bypassing the low-pass filter 3. From the output of the multiplexer 4, the signal is fed to the input of the ADC 5, which is the input of the channel for extracting the envelope of the alternating current pulses, which, in addition to the ADC 5, includes a DSP 7, a module calculation unit 8, a low-frequency filter 9, a threshold calculation unit 12, and a digital threshold device 11. In addition, the attenuator 2, multiplexer 4, The ADC 5 and the digitally controlled AGC 6 form a system for automatically adjusting the gain of the input signal. The ADC 5 converts the signal from analog to digital. The calculation unit of module 8 calculates the module of the bipolar sinusoidal signal and converts it to unipolar. In DPSF 9, a digital signal is filtered. From the output of the DPSF 9, the signal is supplied to the first input of the multiplexer 10. In the case when the input signal is a DC pulse, it is fed to the second input of the multiplexer 10 from the output of the ADC 5. The threshold calculation unit 12 automatically sets the threshold value equal to half the amplitude of the video signal and in the digital threshold device 11, the video signal is selected in accordance with the value of the set threshold. From the output of the threshold device 11, a rectangular video signal is supplied to the inputs of the selector of the duration of time intervals 13 and the pulse shaper 15. In the selector 13, the duration of the time intervals between the pulses of the ALSN signal is compared with a predetermined threshold value of the duration and the signal is formed at the moment of equality of the indicated durations. The output signal of the selector 13 is fed to the input of the reset device 14, which generates a signal input to the installation at “0” of the counter 16. The pulse shaper 15 generates pulses of the edges of the video signal arriving at its input and feeds them to the counter input of the counter 16. Counter 16 generates a code corresponding to the sum of the numbers of pulses and intervals of the code signal. At the output of the decoder 17 pulses are formed, the duration of which is equal to the duration of the pulses and intervals of the code signal. Using the multiplexer 18, the output of the decoder 17 is connected to the second input of the “And” element 19, the first input of which is supplied with pulses of the reference frequency from the output of the reference frequency generator 24. The “And” 19 together with the reset pulse generator 20 form the control device of the second counter 21. The reset pulse generator 20 sets the counter 21 to “0”, and the reference frequency pulses arrive at the first input of the counter 21 from the output of the element “I” 19 during the duration of the measured element of the code signal.

Since the filters — CPF 7 and CFF 9 — have a finite passband, as a result of filtering the studied signals, their shape is distorted, which ultimately leads to a decrease in the accuracy of measurements of the temporal parameters of code signals. To avoid this, ROM 26 and an adder 22 are introduced into the device. Correction data are entered into the ROM 26 at the device calibration stage, taking into account errors introduced into the measurement of time parameters of ALSN code signals during their filtering. In the adder 22, the measurement results of the counter 21 and the correction data from the ROM 26 are added to the second input of the adder 22. The result is an increase in the accuracy of measuring the time parameters of the ALSN code signals.

From the output of the adder 22, the signal through the switch 30 is fed to the code conversion unit 31, and after decryption, the measurement results are displayed on the display screen 32.

To decode the signals of the fire code, a register 23 is entered into the device, the data input of which is connected to the output of the counter 16, the recording input is connected to the output of the selector for the duration of time intervals 13, and the output is connected to the fifth input of the switch 30. For example, the fire code (“KZh” code) consists of two short pulses alternating with longer (longer) intervals between them. The decoding process is as follows. The selector of the duration of the time intervals 13 detects the appearance of a long pause and gives the corresponding signal to the input of the register register 23. Since the long interval is preceded by one pulse, the shaper 15 generates two pulses corresponding to the front and the fall of the first short pulse of the “QOL” code, and feeds them to the counting input of the counter 16, the output of which appears the code "2", transferred to the input of the register data 23. The appearance on the inputs of the register 23 information about the long interval and code "2" indicates the fire code "KZh". From the output of register 23, the signal is supplied to the third input of the switch 30 and then to the code conversion unit 31. The decoded signal is displayed on the display screen 32.

Similarly, the fire code "G" is determined, which corresponds to the code "4" at the output of the counter 16, and the fire code "3", which corresponds to the code "6" at the output of the counter 16.

2. The decoding mode of the signals ALS-EN. The input signal ALS-EN, which is a coded sinusoidal signal with double phase difference modulation, is fed to the input of the input device 1. The control unit 25 switches the multiplexer 4, adjusts the center frequency of the DSP 7 and switches the switch 30 to the measurement mode of the signal parameters ALS-EN. From the output of the PSC 7, the ALS-EN signal is fed to the first input of the correlator 28, the second input of which from the output of the ROM 27 receives possible copies of the ALS-EN signals. The correlator 28 compares the current signal with the copies stored in the ROM 27 and, if the ALS-EH signal matches one of the copies, issues the ALS-EH signal code to the fourth input of the switch 30 and the ROM input 29, which stores information about the motion indicators corresponding to the signal codes ALS-EN. From the output of the ROM 29, information about the motion indicators corresponding to the decoded signal ALS-EN is supplied to the fifth input of the switch 30. Unit 31 decodes the codes and the decoded signal ALS-EH and the corresponding motion indicators are displayed on the display screen 31.

The advantages of the claimed device compared to the prototype device are:

- improving the accuracy of measuring the time parameters of the ALSN code signals by introducing correction data;

- expansion of functionality due to decoding of ALSN code signals and decoding and indication of ALS-EN code signals and indication of ALS-EN motion indicators.

LITERATURE

1. USSR author's certificate No. 1028547, cl. B 61 L 3/20, 1983

2. USSR copyright certificate No. 1411202, cl. B 61 L 25/06, 1988

3. RF patent No. 2092356, cl. B 61 L 25/06, 1997

4. Copyright certificate of the USSR No. 785797, cl. G 01 R 29/02, 1980 (prototype).

Claims (2)

1. A device for measuring parameters of signals of an automatic locomotive alarm, comprising a channel for selecting an envelope of alternating current pulses, the output of which is connected to the inputs of a selector for the duration of time intervals and a pulse former, and the output of the selector for the duration of time intervals is connected to the first input of the reset device, the output of which is connected to the input setting to “0” the first counter, and the output of the pulse former is connected to the counting input of the first counter connected to the input by the input a decoder house, the output of which is connected to the first input of the first multiplexer, connected by the output to the first input of the second counter control device, the second input of which is connected to the output of the reference frequency generator, the first output is connected to the counting input of the second counter, and the second output is connected to the installation input in 0 "of the second counter, code conversion unit and indicator device, characterized in that it is equipped with a signal preprocessing channel; the channel for selecting the envelope of the AC pulses is made in the form of an analog-to-digital converter connected by an output to the first input of a digital band-pass filter, the output of which is connected to the input of the module calculation unit; digital low-pass filter, the input connected to the output of the module calculation unit, and the output to the first input of the second multiplexer, the second input of which is connected to the output of the analog-to-digital converter, and the output is connected to the input of the threshold calculation unit and the first input of the digital threshold device, the second input which is connected to the output of the threshold calculation unit, and the output is the output of said channel; in addition, the device is equipped with a control unit, the input of which is connected to the output of the reference frequency generator, the first output is connected to the second input of the digital bandpass filter, the second output is connected to the third input of the second multiplexer, and the third output is connected to the first input of the first multiplexer and the input of the first permanent memory a device whose output is connected to the first input of the adder, the second input of which is connected to the output of the second counter; a switch, the first input of which is connected to the fourth output of the control unit, and the second input to the output of the adder; a register, the data input of which is connected to the output of the first counter, the recording input is connected to the output of the selector for the duration of time intervals, and the output is connected to the third input of the switch; a correlator, the first input of which is connected to the output of the digital band-pass filter, the second input is connected to the output of the second read-only memory, and the output is connected to the input of the third read-only memory and the fourth input of the switch, the fifth input of which is connected to the output of the third read-only memory, the switch is connected to the input of the code converter block, the output of which is connected to the indicator device, and the second input of the reset device is connected to the digital output th threshold device. 2. A device for measuring parameters of signals of an automatic locomotive alarm according to claim 1, characterized in that the channel for preliminary signal processing includes an input device, the output of which is connected to the first input of the attenuator; low-pass filter, the input of which is connected to the output of the attenuator; the third multiplexer, the first input of which is connected to the output of the low-pass filter, the second input is connected to the output of the attenuator, the third input is connected to the second output of the control unit, and the output is connected to the input of the analog-to-digital converter of the channel for selecting the envelope of alternating current pulses of an alternating current, and the automatic gain control unit connected by the input to the output of the analog-to-digital converter, and the output - with the second input of the attenuator.