CN112653690A - Analog demodulation circuit for acquiring message by C interface of ground electronic unit - Google Patents
Analog demodulation circuit for acquiring message by C interface of ground electronic unit Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention provides a simulation demodulation circuit for acquiring messages by a C interface of a ground electronic unit, which comprises: the interface circuit unit is connected with the ground electronic unit C interface and used for receiving the C interface signal; the mutual inductor T1 is connected with the interface circuit unit and is used for collecting voltage induction signals; the C1 signal analog demodulation unit is connected with the mutual inductor T1 and is used for filtering a C1 signal from the voltage induction signal and generating a DBPL code signal; the C6 signal energy detection unit is connected with the mutual inductor T1 and is used for filtering a C6 signal from the voltage induction signal and detecting the energy of the C6 signal; and the signal processing unit is respectively connected with the C1 signal analog demodulation unit and the C6 signal energy detection unit and is used for decoding the DBPL coded signal generated by the C1 signal analog demodulation unit and judging whether the energy of the C6 signal meets the requirement or not. The invention can realize the analog demodulation and the logic decoding of the C1 message signal and simultaneously realize the energy detection of the C6 signal.
Description
Technical Field
The invention relates to the technical field of railway communication signals, in particular to a simulation demodulation circuit for acquiring messages by a C interface of a ground electronic unit.
Background
In a railway signal system, a ground electronic unit (LEU) is key equipment for transmitting variable messages in a transponder system, and forms a point type signal transmission system together with a ground transponder and a vehicle-mounted antenna, so that trackside equipment and vehicle-mounted equipment can transmit information at scattered points.
The LEU needs to send the ground data to the automatic train protection system (ATP) via the C1 signal and the C6 signal. The C1 signal is a message sent by the LEU to the active transponder, and the C6 signal provides energy to the active transponder interface circuit for the LEU.
The interface C is an interface between an LEU and an active responder and is mainly responsible for transmitting a C1 message signal and a C6 energy signal.
In actual debugging, a professional instrument is needed to detect whether the two signals are normal or not, detect whether a C6 energy signal meets an energy requirement or not, and realize DBPL decoding of a C1 message signal, so that the requirements of field LEU message sending verification and C6 energy signal detection are met. However, such specialized meters are costly.
Disclosure of Invention
The invention aims to provide a ground electronic unit C interface acquisition message analog demodulation circuit, which realizes analog demodulation and logic decoding of a C1 message signal, realizes detection of C6 signal energy and reduces the cost.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
a demodulation analog circuit for acquiring a message by a C interface of a ground electronic unit comprises:
the interface circuit unit is connected with the ground electronic unit C interface and used for receiving the C interface signal;
the mutual inductor T1 is connected with the interface circuit unit and is used for collecting voltage induction signals;
the C1 signal analog demodulation unit is connected with the mutual inductor T1 and is used for filtering a C1 signal from the voltage induction signal and generating a DBPL code signal;
a C6 signal energy detecting unit connected to the mutual inductor T1 for filtering the C6 signal from the voltage sensing signal and detecting the energy of the C6 signal;
and the signal processing unit is respectively connected with the C1 signal analog demodulation unit and the C6 signal energy detection unit and is used for decoding the DBPL coded signal generated by the C1 signal analog demodulation unit and judging whether the energy of the C6 signal meets the requirement or not.
Further, in the above-mentioned analog demodulation circuit for acquiring a message at the interface C of the ground electronic unit, the interface circuit unit includes: TVS protection tube, LC band-pass filter module and matched resistance, wherein, LC band-pass filter module with matched resistance after establishing ties with the TVS protection tube is parallelly connected, matched resistance with mutual inductance coil T1's input is parallelly connected.
Furthermore, in the above-mentioned analog demodulation circuit for acquiring messages at the interface C of the ground electronic unit, an FPGA is used as the signal processing unit.
Further, in the above-mentioned ground electronic unit C interface acquisition message analog demodulation circuit, the C1 signal analog demodulation unit includes a high-pass filter circuit module, a dc blocking ac capacitor and a comparison circuit module, which are connected in sequence;
the high-pass filter circuit module is connected with the output end of the mutual inductor T1, the voltage induction signal is filtered out to be a C1 signal through the high-pass filter circuit module, and the voltage induction signal is connected to the comparison circuit module to generate and output a DBPL coding signal after passing through the blocking AC capacitor.
Further, in the above-mentioned analog demodulation circuit for obtaining a message at the C interface of the ground electronic unit, the high-pass filter circuit module includes two branches connected in parallel, where one branch includes a resistor R1 and a capacitor C1 connected in series, the other branch includes a resistor R2, and the impedances of the two branches are different.
Further, in the above-mentioned analog demodulation circuit for acquiring a message at the C interface of the ground electronic unit, the comparison circuit module includes a first dc bias circuit, a second dc bias circuit, and a comparator, where the first dc bias circuit generates a first bias voltage, the second dc bias circuit generates a second bias voltage, the first bias voltage is accessed by the C1 signal of the dc blocking ac capacitor, and the DBPL encoded signal is generated by the comparator and output through a pull-up resistor together with the second bias voltage.
Further, in the above-mentioned analog demodulation circuit for acquiring a message at the interface C of the ground electronic unit, the signal energy detection unit C6 includes a rectifier circuit module, a filter circuit module and a comparator connected in sequence;
the rectifying circuit module is connected with the output end of the mutual inductor T1, the voltage induction signal generates a unipolar level signal through the rectifying circuit module, the unipolar level signal is connected to the filter circuit module to filter out a C6 signal, and then the unipolar level signal is compared with a preset level signal through the comparator to detect the energy of the C6 signal.
Further, in the above-mentioned analog demodulation circuit for acquiring a message at the interface C of the ground electronic unit, the rectifier circuit module includes a full-bridge diode.
Further, in the above-mentioned analog demodulation circuit for acquiring a message at the interface C of the ground electronic unit, the filter circuit module includes two parallel branches, one of the branches includes two LC circuits connected in series, and the other branch includes a filter capacitor C3.
Compared with the prior art, the invention has the following advantages:
1) the invention innovatively designs the C1 signal analog demodulation unit, realizes the analog demodulation and the logic decoding of the C1 message signal, and has the characteristics of low cost, strong practicability and the like, and simultaneously, the invention also innovatively designs the C6 signal energy detection unit, realizes the energy detection of the C6 signal, and has unique advantages compared with other equipment manufacturers;
2) the demodulation circuit provided by the invention is simpler and more efficient, can be used for conveniently manufacturing a test instrument, is applied to field engineering debugging and checking of C interface signals, can realize real-time demodulation and judgment of the accuracy or the error rate of a message sent by an LEU (line terminal Unit) by simulating demodulation and logic decoding of a C1 message signal, is added with a C6 signal energy detection circuit, and enriches the test completeness of the C interface.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are an embodiment of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts according to the drawings:
fig. 1 is a block diagram of a ground electronic unit C interface acquisition message analog demodulation circuit according to an embodiment of the present invention;
fig. 2 is a block diagram of a C1 signal analog demodulation unit;
fig. 3 is a diagram illustrating the result of filtering the waveform of the C signal in the C1 signal analog demodulation unit;
FIG. 4 is a schematic diagram of the generation of a DBPL square wave by a comparator in a C1 signal analog demodulation unit;
fig. 5 is a block diagram of a C6 signal energy detection unit.
Detailed Description
The analog demodulation circuit for acquiring messages by the C interface of the ground electronic unit according to the present invention will be described in detail with reference to fig. 1 to 5 and the detailed description thereof. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise scale for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention. To make the objects, features and advantages of the present invention comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.
As shown in fig. 1, the analog demodulation circuit for acquiring a message through a C interface of a ground electronic unit according to an embodiment of the present invention includes an interface circuit unit 100, a mutual inductor T1, a C1 signal analog demodulation unit 200, a C6 signal energy detection unit 300, and a signal processing unit 400.
Specifically, the interface circuit unit 100 is connected to a ground electronic unit C interface, and is configured to receive a C interface signal;
the mutual inductor T1 is connected with the interface circuit unit 100 and used for collecting voltage induction signals;
the C1 signal analog demodulation unit 200 is connected to the mutual inductor T1 and is used for filtering a C1 signal from the voltage induction signal and generating a DBPL coded signal;
the C6 signal energy detecting unit 300, connected to the mutual inductor T1, for filtering the C6 signal from the voltage sensing signal and detecting the energy of the C6 signal;
the signal processing unit 400 is respectively connected with the C1 signal analog demodulation unit 200 and the C6 signal energy detection unit 300, and is used for decoding the DBPL coded signal generated by the C1 signal analog demodulation unit 200 and judging whether the energy of the C6 signal meets the requirement.
Preferably, the signal processing unit 400 may employ an FPGA to reduce cost.
The external LEU device accesses the C interface signal to the interface circuit unit 100 to realize the interface end filtering and impedance matching, and the voltage induction signal is collected by the mutual inductor T1 and is respectively sent to the C1 signal analog demodulation unit 200 and the C6 signal energy detection unit 300. Specifically, the interface circuit unit 100 includes: TVS protection tube D2, LC band-pass filtering module LC and matching resistance R8, wherein, LC band-pass filtering module LC with matching resistance R8 after establishing ties with TVS protection tube D2 is parallelly connected, matching resistance R8 with mutual inductor T1's input is parallelly connected.
Preferably, the C1 signal analog demodulation unit 200 is implemented by using a low-cost RC circuit and a comparator. As shown in fig. 2, the C1 signal analog demodulation unit 200 includes a high-pass filter circuit module 201, a dc blocking ac capacitor C2, and a comparison circuit module 202, which are connected in sequence, where the high-pass filter circuit module 201 is connected to an output end of the mutual inductor T1, and the voltage sensing signal filters out a C1 signal through the high-pass filter circuit module 201, and after passing through the dc blocking ac capacitor C2, is connected to the comparison circuit module 202 to generate a DBPL encoded signal and output the DBPL encoded signal.
Specifically, the high-pass filter circuit module 201 includes two branches connected in parallel, one branch includes a resistor R1 and a capacitor C1 connected in series, the other branch includes a resistor R2, and the impedances of the two branches are different. The voltage sensing signal is processed by the high-pass filter circuit module 201, and a C6 signal (8.8Khz sine wave) is suppressed, so that a C1 signal (564Khz/282Khz square wave) is filtered out.
The filtered C1 signal passes through the dc blocking ac capacitor C2 and then finally enters the comparison circuit module 202, where the comparison circuit module 202 includes a first dc bias circuit and a second dc bias circuit and a comparator U1, the first dc bias circuit generates a first bias voltage Vref1(R3/R4 division), the second dc bias circuit generates a second bias voltage Vref2(R5/R6 division), the C1 signal passing through the dc blocking ac capacitor C2 is introduced into the first bias voltage Vref1, and the second bias voltage Vref2 generates a DBPL encoded signal through the comparator U1 and outputs the DBPL encoded signal through a pull-up resistor R7. Wherein Vref1 and Vref2 are equal in voltage value.
After being conditioned by the conditioning RC circuit, the waveform filtering result of the C signal is shown in fig. 3, where VM1 is the input signal of the high-pass filter circuit module 201, VM3 is the output signal of the high-pass filter circuit module 201, the left side in fig. 3 is the waveform input to the high-pass filter circuit module 201, and the right side in fig. 3 is the waveform output by the high-pass filter circuit module 201. As can be seen from fig. 3, the C6 signal (8.8Khz sine wave) is significantly suppressed, and the amplitude is attenuated by about 4 times. The attenuation of the C1 signal (564Khz/282Khz square wave) was small.
The DBPL square wave generated by comparator U1 after dc biasing is shown in fig. 4.
As shown in fig. 5, the C6 signal energy detection unit 300 includes a rectifier circuit module 301, a filter circuit module 302, and a comparator U2, which are connected in sequence, wherein the rectifier circuit module 301 is connected to an output end of the mutual inductance coil T1, the voltage sensing signal generates a unipolar level signal through the rectifier circuit module 301, the unipolar level signal is connected to the filter circuit module 302 to filter out a C6 signal, and then the unipolar level signal is compared with a preset level signal through the comparator U2 to detect the energy of the C6 signal.
Preferably, the rectifier circuit module 301 includes a full bridge diode D1, and the filter circuit module 302 includes two parallel branches, one of which includes two LC circuits connected in series, and the other of which includes a filter capacitor C3.
In this embodiment, the voltage induction signal collected by the mutual inductor T1 generates a single polarity level U0 through a full-bridge diode D1 of the rectifier circuit module 301, the voltage signal U0 is connected to the filter circuit module 302, and is filtered through L1/C4 band rejection and L2/C5 band rejection to remove main frequency sections 564K and 287K of the C1 signal, and then the high frequency interference is removed through a filter capacitor C3. And finally, level inversion is generated between the voltage level inversion circuit and a preset level signal Vref3 through a comparator U2, wherein a high level represents that the energy of the C6 is insufficient, and a low level represents that the energy of the C6 signal meets the requirement.
In summary, the C interface acquisition message analog demodulation circuit of the ground electronic unit provided by the invention innovatively designs the C1 signal analog demodulation unit, and has the characteristics of low cost, strong practicability and the like for realizing analog demodulation and logic decoding of a C1 message signal, and simultaneously, the C6 signal energy detection unit is innovatively designed in the invention, so that energy detection of a C6 signal is realized, and the circuit has unique advantages compared with other equipment manufacturers.
The ground electronic unit C interface message acquisition simulation demodulation circuit provided by the invention is simpler and more efficient, can be used for conveniently manufacturing a test instrument, is applied to field engineering debugging and checking of C interface signals, can realize real-time demodulation and judgment of the accuracy or error rate of a message sent by an LEU (electronic equipment unit) by performing simulation demodulation and logic decoding on the C1 message signals, is added with a C6 signal energy detection circuit, and enriches the test completeness of the C interface.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (9)
1. A demodulation analog circuit for acquiring a message by a C interface of a ground electronic unit is characterized by comprising:
the interface circuit unit is connected with the ground electronic unit C interface and used for receiving the C interface signal;
the mutual inductor T1 is connected with the interface circuit unit and is used for collecting voltage induction signals;
the C1 signal analog demodulation unit is connected with the mutual inductor T1 and is used for filtering a C1 signal from the voltage induction signal and generating a DBPL code signal;
a C6 signal energy detecting unit connected to the mutual inductor T1 for filtering the C6 signal from the voltage sensing signal and detecting the energy of the C6 signal;
and the signal processing unit is respectively connected with the C1 signal analog demodulation unit and the C6 signal energy detection unit and is used for decoding the DBPL coded signal generated by the C1 signal analog demodulation unit and judging whether the energy of the C6 signal meets the requirement or not.
2. The ground electronic unit C interface acquisition message analog demodulation circuit of claim 1, wherein the interface circuit unit comprises: TVS protection tube, LC band-pass filter module and matched resistance, wherein, LC band-pass filter module with matched resistance after establishing ties with the TVS protection tube is parallelly connected, matched resistance with mutual inductance coil T1's input is parallelly connected.
3. The ground electronic unit C-interface acquisition message analog demodulation circuit according to claim 1, wherein an FPGA is adopted as the signal processing unit.
4. The analog demodulation circuit for message acquisition at interface C of ground electronic unit according to claim 1, wherein said analog demodulation circuit for C1 signal comprises a high-pass filter circuit module, a dc blocking ac capacitor and a comparison circuit module connected in sequence;
the high-pass filter circuit module is connected with the output end of the mutual inductor T1, the voltage induction signal is filtered out to be a C1 signal through the high-pass filter circuit module, and the voltage induction signal is connected to the comparison circuit module to generate and output a DBPL coding signal after passing through the blocking AC capacitor.
5. The ground electronic unit C interface acquisition message analog demodulation circuit as claimed in claim 4, wherein the high-pass filter circuit module comprises two branches connected in parallel, wherein one branch comprises a resistor R1 and a capacitor C1 connected in series, the other branch comprises a resistor R2, and the impedances of the two branches are different.
6. The analog demodulation circuit for message acquisition at C interface of ground electronic unit according to claim 4, wherein the comparing circuit module comprises a first dc bias circuit and a second dc bias circuit and a comparator, the first dc bias circuit generates a first bias voltage, the second dc bias circuit generates a second bias voltage, the first bias voltage is connected to the C1 signal through the dc blocking ac capacitor, and the DBPL encoded signal is generated by the comparator and output through a pull-up resistor together with the second bias voltage.
7. The analog demodulation circuit for acquiring the message by the C interface of the ground electronic unit according to claim 1, wherein the C6 signal energy detection unit comprises a rectification circuit module, a filter circuit module and a comparator which are connected in sequence;
the rectifying circuit module is connected with the output end of the mutual inductor T1, the voltage induction signal generates a unipolar level signal through the rectifying circuit module, the unipolar level signal is connected to the filter circuit module to filter out a C6 signal, and then the unipolar level signal is compared with a preset level signal through the comparator to detect the energy of the C6 signal.
8. The ground electronics unit C-interface captured message analog demodulation circuit of claim 7, wherein the rectifier circuit module comprises a full bridge diode.
9. The ground electronic unit C-interface captured message analog demodulation circuit of claim 7, wherein said filter circuit module comprises two parallel branches, one of which comprises two LC circuits in series, the other of which comprises a filter capacitor C3.
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