阅读说明：本技术 应答器监测装置 (Transponder monitoring device ) 是由 熊飞 于 2020-05-28 设计创作，主要内容包括：本发明涉及一种应答器监测装置,包括有第一选频滤波放大电路,鉴频解调电路,第二选频滤波放大电路,检波整流电路,微处理器和输出电路。本发明通过第一选频滤波放大电路接收应答器发出的电磁波信号,通过第二选频滤波放大电路接收车载BTM发出的电磁波信号,本发明可对应答器和车载BTM进行实时监测,不需要携带示波器人工逐个检查,不改变原有设施的工作状态,即使发生极端特殊事件,可控制检测装置处于不工作的状态,对应答器和车载BTM的正常工作没有影响。本发明无电磁波震荡电路,仅接收BTM和应答器的射频信号,对外界没有射频信号辐射或泄露,不会干扰外部其它设施,同时需要在原有的设备基础上增加的外围部件数量较少,成本较低。(The invention relates to a transponder monitoring device, which comprises a first frequency-selecting filtering amplification circuit, a frequency discrimination demodulation circuit, a second frequency-selecting filtering amplification circuit, a detection rectification circuit, a microprocessor and an output circuit. The invention receives the electromagnetic wave signal sent by the responder through the first frequency-selecting filtering amplification circuit and receives the electromagnetic wave signal sent by the vehicle-mounted BTM through the second frequency-selecting filtering amplification circuit, can monitor the responder and the vehicle-mounted BTM in real time, does not need to carry an oscilloscope to manually check one by one, does not change the working state of original facilities, can control the detection device to be in the non-working state even if extreme special events occur, and has no influence on the normal working of the responder and the vehicle-mounted BTM. The invention has no electromagnetic wave oscillating circuit, only receives the radio frequency signals of the BTM and the transponder, has no radio frequency signal radiation or leakage to the outside, does not interfere other external facilities, and simultaneously has less peripheral parts which need to be added on the basis of the original equipment and lower cost.)

1. A transponder monitoring device, comprising:

the first frequency-selecting filtering amplification circuit is coupled with the frequency discrimination demodulation circuit and used for receiving the electromagnetic wave signal sent by the responder, and sending the electromagnetic wave signal to the frequency discrimination demodulation circuit after frequency-selecting filtering amplification;

the frequency discrimination demodulation circuit is coupled with the first frequency-selecting filtering amplification circuit, connected with the microprocessor and used for identifying the received electromagnetic wave signal and outputting an FSK output signal;

the second frequency-selecting filtering amplification circuit is coupled with the detection rectification circuit and used for receiving the electromagnetic wave signal sent by the vehicle-mounted BTM, carrying out frequency-selecting filtering amplification and then sending to the detection rectification circuit;

the detection rectifying circuit is coupled with the second frequency-selective filtering amplifying circuit, connected with the microprocessor and used for identifying the received electromagnetic wave signal and outputting an RF output signal;

the microprocessor is connected with the frequency discrimination demodulation circuit, the detection rectification circuit and the output circuit, and is used for receiving the FSK output signal sent by the frequency discrimination demodulation circuit and the RF output signal sent by the detection rectification circuit, performing corresponding logic processing and controlling the output circuit to output corresponding signals to the outside; and

and the output circuit is connected with the microprocessor and used for controlling the output circuit to output corresponding signals to the outside under the control of the microprocessor.

2. The transponder monitoring device of claim 1, wherein the output circuit outputs an alarm signal a if the electromagnetic wave signal from the vehicle-mounted BTM is detected abnormally, an alarm signal B if the electromagnetic wave signal from the transponder is detected abnormally, and a normal signal C if the electromagnetic wave signals from the transponder and the vehicle-mounted BTM are detected normally under the control of the microprocessor.

3. The transponder monitoring device according to claim 1, wherein the first frequency selective filter amplifying circuit is formed by connecting an inductor L2 and a capacitor C2 in parallel for receiving electromagnetic wave signals transmitted from the transponder, one end of the first frequency selective filter amplifying circuit is connected in series with a parallel circuit of an inductor L21 and a capacitor C21, a resistor R21 and a non-inverting input terminal of an operational amplifier OP22, the other end of the first frequency selective filter amplifying circuit is connected in series with a parallel circuit of an inductor L22 and a capacitor C22, a resistor R22 and a non-inverting input terminal of an operational amplifier OP21,

an inductor L23 is connected at a series node between the parallel circuit of the inductor L21 and the capacitor C21 and the resistor R21, the inductor L23 is connected at a series node between the parallel circuit of the inductor L22 and the capacitor C22 and the resistor R22 through a capacitor C23,

the inverting input terminal of the operational amplifier OP22 is connected to the output terminal of the operational amplifier OP22 through a resistor R24,

the inverting input terminal of the operational amplifier OP21 is connected to the output terminal of the operational amplifier OP21 through a resistor R25,

the inverting input terminal of the operational amplifier OP22 is connected to the inverting input terminal of the operational amplifier OP21 via a resistor R23,

the output terminal of the operational amplifier OP21 is connected to the output terminal of the operational amplifier OP22 via a coil mutually coupled to the frequency discrimination adjusting circuit.

4. The transponder monitoring device according to claim 1, wherein the second frequency selective filter amplifying circuit is a parallel circuit of an inductor L11 and a capacitor C11, a resistor R11 and a non-inverting input terminal of an operational amplifier OP12, and the other end of the second frequency selective filter amplifying circuit is a parallel circuit of an inductor L12 and a capacitor C12, a resistor R12 and a non-inverting input terminal of an operational amplifier OP11, after the inductor L1 and the capacitor C1 which receive the electromagnetic wave signal transmitted by the vehicle-mounted BTM are connected in parallel,

an inductor L13 is connected at a series node between the parallel circuit of the inductor L11 and the capacitor C11 and the resistor R11, the inductor L13 is connected at a series node between the parallel circuit of the inductor L12 and the capacitor C12 and the resistor R12 through a capacitor C13,

the inverting input terminal of the operational amplifier OP12 is connected to the output terminal of the operational amplifier OP12 through a resistor R14,

the inverting input terminal of the operational amplifier OP11 is connected to the output terminal of the operational amplifier OP11 through a resistor R15,

the inverting input terminal of the operational amplifier OP12 is connected to the inverting input terminal of the operational amplifier OP11 via a resistor R13,

an output terminal of the operational amplifier OP12 is connected to an output terminal of the operational amplifier OP11 via a coil mutually coupled to the detection rectification circuit.

5. The transponder monitoring device of claim 1 wherein the frequency discrimination demodulation circuit comprises two series coils coupled to the coils of the first frequency selective filter amplifier circuit, one end of the two series coils being connected to the inverting input of the operational amplifier components through the anode of the diode D21 and the resistor R26, the other end of the two series coils being connected in series to the cathode of the diode D22 and the resistor R27 and then being connected to the inverting input of the operational amplifier components; a diode D23 and a diode D24 which are connected in parallel and have opposite polarity directions are connected between the same-direction input end and the inverting input end of the operational amplifier comparator; the series node of the two series coils is divided into five paths, one path is grounded, the other path is connected with the anode of a diode D21 through a capacitor C24, the other path is connected with the cathode of a diode D22 through a capacitor C25, the other path is connected with the series node of a diode D21 and a resistor R26 through a capacitor C26, and the other path is connected with the series node between the diode D22 and the resistor R27 through a capacitor C27; the output terminal of the operational amplifier compactors is the output terminal of the frequency discrimination demodulation circuit.

6. The transponder monitoring device of claim 1, wherein the detector-rectifier circuit comprises two series coils coupled to the coils of the second frequency-selective filter-amplifier circuit, one end of each series coil is connected to the anode of a diode D11 and then connected to the output end of the detector-rectifier circuit, and the other end of each series coil is connected to the anode of a diode D12 and then connected to the output end of the detector-rectifier circuit; the series node of the two series coils is divided into two paths, one path is grounded, and the other path is connected to the output end of the detection rectification circuit through a capacitor C14.

7. The transponder monitoring device according to claim 1, wherein the microprocessor is an STM8AF6223 microprocessor, the FSK output signal sent by the detection and rectification circuit is connected to the terminal No. 19 of the STM8AF6223 microprocessor, and the RF output signal sent by the detection and rectification circuit is connected to the terminal No. 20 of the STM8AF6223 microprocessor.

8. The transponder monitoring device of claim 6 wherein the output circuit employs a chip AD421 as an output circuit, connecting terminals 20, 21 and 22 of the STM8AF6223 microprocessor.

Technical Field

The invention relates to the technical field of transponder detection, in particular to a transponder monitoring device.

Background

The traditional railway embeds marks for marking railway line parameters at the side of the railway for visual observation of train drivers. The high-speed railway is not suitable for visual observation of the line marks on the sides of the railway due to the high running speed. In order to overcome the defects, the method is upgraded to automatically read the electronic mark stored with the railway line parameters by a train control system at the present stage, and the high-speed railway train control system comprises two parts, namely ground equipment and vehicle-mounted equipment. The transponder is one of important components of the ground equipment, and the vehicle-mounted transponder information receiving module (vehicle-mounted BTM) is one of important components of the vehicle-mounted equipment.

The Chinese train control system has 5 application levels which are CTCS-0 to CTCS-4 levels respectively. The transponder and the vehicle-mounted BTM will be described below using the CTCS-2 train control system as an example. The transponder is used for ground-to-train information transmission, and provides point information including line length, line gradient, line temporary speed limit, access information and the like. The transponder delivers information to the locomotive in a fixed format-messages. Transponders are of two types, passive transponders and active transponders. The passive transponder mainly transmits fixed information (such as line length information and line gradient information) on the ground, and the message is written by the wireless reader-writer. The active transponder is connected with a ground electronic unit (LEU) through a cable and is responsible for transmitting real-time variable information (such as temporary speed limit information, station route information and the like) to the train, and messages of the active transponder are transmitted to the train through the LEU by equipment such as a train control center, a station interlock and the like.

The train bottom is provided with vehicle antenna, and when the train passed through transponder (including active transponder and passive transponder) top, when vehicle antenna was located the transponder top promptly, the transponder received vehicle antenna (behind the electromagnetic energy of transmission, electronic circuit work, and the data message circulation of storage is sent away, and the energy disappears thereupon.

The vehicle-mounted antenna transmits the received data message to the vehicle-mounted BTM, the vehicle-mounted BTM decodes the received data message to become a user message, and then the user message is transmitted to a safety computer in a train control vehicle-mounted host machine for processing, and the safety computer integrates, analyzes and processes the information received from each module (including the BTM module) according to the information to generate a target distance mode curve and control the train to run. The method for acquiring the track parameters of the running train is that an electromagnetic wave of 27.095MHz is emitted to the track direction by a vehicle-mounted BTM unit (transponder system vehicle-mounted device). And a transponder placed on the ground track receives 27.095MHz electromagnetic waves transmitted by the vehicle-mounted BTM, and a circuit in the transponder receives and processes the electromagnetic waves to be used as an operating power supply of the circuit in the transponder. And simultaneously, a transmitting circuit in the transponder is started, and electromagnetic waves with another frequency are used for transmitting stored information such as the track and the running parameters to the train. If the responder breaks down, the train cannot receive the track parameter information, and the normal operation of the train is influenced.

In the existing equipment and method for detecting the transponder, the detection process is complex, the detection coil is single, the stability is insufficient, the detection accuracy is low, and the detection unit has radio frequency signal radiation or leakage to generate interference to the outside. In order to achieve the detection accuracy, a signaler is required to carry an oscilloscope to the field to read the data of the transponder, and the manual and mechanical costs are high.

Disclosure of Invention

The invention aims to provide a transponder monitoring device to solve the problem of inaccurate transponder detection in the prior art.

The invention is realized by the following steps: a transponder monitoring device comprising:

the first frequency-selecting filtering amplification circuit is coupled with the frequency discrimination demodulation circuit and used for receiving the electromagnetic wave signal sent by the responder, and sending the electromagnetic wave signal to the frequency discrimination demodulation circuit after frequency-selecting filtering amplification;

the frequency discrimination demodulation circuit is coupled with the first frequency-selecting filtering amplification circuit, connected with the microprocessor and used for identifying the received electromagnetic wave signal and outputting an FSK output signal;

the second frequency-selecting filtering amplification circuit is coupled with the detection rectification circuit and used for receiving the electromagnetic wave signal sent by the vehicle-mounted BTM, carrying out frequency-selecting filtering amplification and then sending to the detection rectification circuit;

the detection rectifying circuit is coupled with the second frequency-selective filtering amplifying circuit, connected with the microprocessor and used for identifying the received electromagnetic wave signal and outputting an RF output signal;

the microprocessor is connected with the frequency discrimination demodulation circuit, the detection rectification circuit and the output circuit, and is used for receiving the FSK output signal sent by the frequency discrimination demodulation circuit and the RF output signal sent by the detection rectification circuit, performing corresponding logic processing and controlling the output circuit to output corresponding signals to the outside; and

and the output circuit is connected with the microprocessor and used for controlling the output circuit to output corresponding signals to the outside under the control of the microprocessor.

The output circuit outputs an alarm signal A when the electromagnetic wave signal sent by the vehicle-mounted BTM is detected abnormally under the control of the microprocessor, outputs an alarm signal B when the electromagnetic wave signal sent by the responder is detected abnormally, and outputs a normal signal C when the electromagnetic wave signal sent by the responder and the electromagnetic wave signal sent by the vehicle-mounted BTM are detected normally.

The first frequency-selecting filtering amplifying circuit is formed by connecting an inductor L2 and a capacitor C2 which receive electromagnetic wave signals sent by a transponder in parallel, then connecting one end of the first frequency-selecting filtering amplifying circuit in series with a parallel circuit of an inductor L21 and a capacitor C21, a resistor R21 and the non-inverting input end of an operational amplifier OP22, connecting the other end of the first frequency-selecting filtering amplifying circuit in series with a parallel circuit of an inductor L22 and a capacitor C22, a resistor R22 and the non-inverting input end of an operational amplifier OP21,

an inductor L23 is connected at a series node between the parallel circuit of the inductor L21 and the capacitor C21 and the resistor R21, the inductor L23 is connected at a series node between the parallel circuit of the inductor L22 and the capacitor C22 and the resistor R22 through a capacitor C23,

the inverting input terminal of the operational amplifier OP22 is connected to the output terminal of the operational amplifier OP22 through a resistor R24,

the inverting input terminal of the operational amplifier OP21 is connected to the output terminal of the operational amplifier OP21 through a resistor R25,

the inverting input terminal of the operational amplifier OP22 is connected to the inverting input terminal of the operational amplifier OP21 via a resistor R23,

the output terminal of the operational amplifier OP21 is connected to the output terminal of the operational amplifier OP22 via a coil mutually coupled to the frequency discrimination adjusting circuit.

The second frequency-selecting filtering amplification circuit is formed by connecting an inductor L1 and a capacitor C1 which receive electromagnetic wave signals sent by the vehicle-mounted BTM in parallel, then connecting one end of the second frequency-selecting filtering amplification circuit in series with a parallel circuit of an inductor L11 and a capacitor C11, a resistor R11 and the non-inverting input end of an operational amplifier OP12, connecting the other end of the second frequency-selecting filtering amplification circuit in series with a parallel circuit of an inductor L12 and a capacitor C12, a resistor R12 and the non-inverting input end of an operational amplifier,

an inductor L13 is connected at a series node between the parallel circuit of the inductor L11 and the capacitor C11 and the resistor R11, the inductor L13 is connected at a series node between the parallel circuit of the inductor L12 and the capacitor C12 and the resistor R12 through a capacitor C13,

the inverting input terminal of the operational amplifier OP12 is connected to the output terminal of the operational amplifier OP12 through a resistor R14,

the inverting input terminal of the operational amplifier OP11 is connected to the output terminal of the operational amplifier OP11 through a resistor R15,

the inverting input terminal of the operational amplifier OP12 is connected to the inverting input terminal of the operational amplifier OP11 via a resistor R13,

an output terminal of the operational amplifier OP12 is connected to an output terminal of the operational amplifier OP11 via a coil mutually coupled to the detection rectification circuit.

The frequency discrimination demodulation circuit comprises two series coils coupled with the coils of the first frequency-selecting filtering amplification circuit, one end of each series coil is connected with the reverse input end of the operational amplifier through the anode of the diode D21 and the resistor R26, and the other end of each series coil is connected with the cathode of the diode D22 and the same-direction input end of the operational amplifier after being connected with the resistor R27 in series; a diode D23 and a diode D24 which are connected in parallel and have opposite polarity directions are connected between the same-direction input end and the inverting input end of the operational amplifier comparator; the series node of the two series coils is divided into five paths, one path is grounded, the other path is connected with the anode of a diode D21 through a capacitor C24, the other path is connected with the cathode of a diode D22 through a capacitor C25, the other path is connected with the series node of a diode D21 and a resistor R26 through a capacitor C26, and the other path is connected with the series node between the diode D22 and the resistor R27 through a capacitor C27; the output terminal of the operational amplifier compactors is the output terminal of the frequency discrimination demodulation circuit.

The detection rectification circuit comprises two series coils coupled with the coils of the second frequency-selective filtering amplification circuit, one end of each series coil is connected with the anode of the diode D11 and then connected to the output end of the detection rectification circuit, and the other end of each series coil is connected with the anode of the diode D12 and then connected to the output end of the detection rectification circuit; the series node of the two series coils is divided into two paths, one path is grounded, and the other path is connected to the output end of the detection rectification circuit through a capacitor C14.

The microprocessor is an STM8AF6223 microprocessor, an FSK output signal sent by the detection and rectification circuit is connected with the No. 19 terminal of the STM8AF6223 microprocessor, and an RF output signal sent by the detection and rectification circuit is connected with the No. 20 terminal of the STM8AF6223 microprocessor.

The output circuit adopts a chip AD421 as an output circuit and is connected with the No. 20 terminal, the No. 21 terminal and the No. 22 terminal of the STM8AF6223 microprocessor.

The invention receives the electromagnetic wave signal sent by the transponder through the first frequency-selecting filtering amplification circuit, and receives the electromagnetic wave signal sent by the vehicle-mounted BTM through the second frequency-selecting filtering amplification circuit. The invention has no electromagnetic wave oscillating circuit, only receives the radio frequency signals of the BTM and the transponder, has no radio frequency signal radiation or leakage to the outside, does not interfere other external facilities, and has less peripheral parts which need to be added on the basis of the original equipment and lower cost.

Drawings

Fig. 1 is a circuit diagram of a first frequency-selective filter amplifier circuit of the present invention.

Fig. 2 is a circuit diagram of a second frequency-selective filter amplifier circuit of the present invention.

FIG. 3 is a circuit diagram of a microprocessor of the present invention.

Fig. 4 is a state diagram of the monitoring device of the present invention in use.

Detailed Description

The device comprises a first frequency-selecting filtering amplification circuit, a frequency discrimination demodulation circuit, a second frequency-selecting filtering amplification circuit, a detection rectification circuit, a microprocessor and an output circuit.

As shown in fig. 1, the first frequency selective filter amplifier circuit is coupled to the frequency discrimination demodulator circuit, and is configured to receive an electromagnetic wave signal from the transponder, perform frequency selective filter amplification, and send the amplified signal to the frequency discrimination demodulator circuit. The first frequency-selecting filtering amplifying circuit is that after an inductor L2 and a capacitor C2 which receive electromagnetic wave signals sent by a transponder are connected in parallel, one end of the first frequency-selecting filtering amplifying circuit is connected in series with a parallel circuit of an inductor L21 and a capacitor C21, a resistor R21 and a non-inverting input end of an operational amplifier OP22, the other end of the first frequency-selecting filtering amplifying circuit is connected in series with a parallel circuit of an inductor L22 and a capacitor C22, a resistor R22 and a non-inverting input end of an operational amplifier OP21, an inductor L23 is connected at a series node between the parallel circuit of the inductor L21 and the capacitor C21 and the resistor R21, an inductor L23 is connected at a series node between the parallel circuit of the inductor L23 and the capacitor C23 and the resistor R23, an inverting input end of the operational amplifier OP 23 is connected at an output end of the operational amplifier OP 23 through the resistor R23, an inverting input end of the operational amplifier OP 23 is connected at an inverting input end of the operational amplifier 23, the output terminal of the operational amplifier OP21 is connected to the output terminal of the operational amplifier OP22 via a coil that is mutually coupled to the frequency discrimination adjusting circuit.

The frequency discrimination demodulation circuit is coupled with the first frequency selection filtering amplification circuit, connected with the microprocessor and used for identifying the received electromagnetic wave signal and outputting an FSK output signal. The frequency discrimination demodulation circuit comprises two series coils coupled with the coil of the first frequency-selecting filtering amplification circuit, one end of each series coil is connected with the reverse input end of the operational amplifier comparator through a diode D21 and a resistor R26, and the other end of each series coil is connected with the cathode of a diode D22 and the same-direction input end of the operational amplifier comparator after being connected with a resistor R27 in series; a diode D23 and a diode D24 which are connected in parallel and have opposite polarity directions are connected between the same-direction input end and the reverse-phase input end of the operational amplifier comparator; the series node of the two series coils is divided into five paths, one path is grounded, the other path is connected with the anode of a diode D21 through a capacitor C24, the other path is connected with the cathode of a diode D22 through a capacitor C25, the other path is connected with the series node of a diode D21 and a resistor R26 through a capacitor C26, and the other path is connected with the series node between the diode D22 and the resistor R27 through a capacitor C27; the output terminal of the operational amplifier compactors is the output terminal of the frequency discrimination demodulation circuit.

As shown in fig. 2, the second frequency-selective filtering and amplifying circuit is coupled to the detection and rectifying circuit, and is configured to receive the electromagnetic wave signal transmitted by the vehicle-mounted BTM, perform frequency-selective filtering and amplifying, and transmit the amplified signal to the detection and rectifying circuit. The second frequency-selecting filtering and amplifying circuit is characterized in that after an inductor L1 and a capacitor C1 which receive electromagnetic wave signals sent by the vehicle-mounted BTM are connected in parallel, one end of the second frequency-selecting filtering and amplifying circuit is connected in series with a parallel circuit of an inductor L11 and a capacitor C11, a resistor R11 and a non-inverting input end of an operational amplifier OP12, the other end of the second frequency-selecting filtering and amplifying circuit is connected in series with a parallel circuit of an inductor L12 and a parallel circuit of a capacitor C12, a resistor R12 and a non-inverting input end of an operational amplifier OP11, an inductor L13 is connected at a series node between the parallel circuit of the inductor L11 and the capacitor C11 and the resistor R11, the inductor L13 is connected at a series node between the parallel circuit of the inductor L13 and the capacitor C13 and the resistor R13, an inverting input end of the operational amplifier OP 13 is connected at an inverting input end of the operational amplifier OP 13 through the resistor R13, an inverting input end of the operational amplifier OP 13 is connected at, an output terminal of the operational amplifier OP12 is connected to an output terminal of the operational amplifier OP11 via a coil mutually coupled with the detection rectification circuit.

The detection rectification circuit is coupled with the second frequency-selecting filtering amplification circuit, is connected with the microprocessor and is used for identifying the received electromagnetic wave signals and outputting RF output signals. The detection rectifying circuit comprises two series coils coupled with the coils of the second frequency-selecting filtering amplifying circuit, one end of each series coil is connected to the output end of the detection rectifying circuit through a diode D11, and the other end of each series coil is connected to the output end of the detection rectifying circuit through a diode D12; the series node of the two series coils is divided into two paths, one path is grounded, and the other path is connected to the output end of the detection rectification circuit through a capacitor C14.

As shown in fig. 3, the microprocessor is connected to the frequency discrimination demodulation circuit, the detection rectification circuit and the output circuit, and is configured to receive the FSK output signal sent by the frequency discrimination demodulation circuit and the RF output signal sent by the detection rectification circuit, perform corresponding logic processing, and control the output circuit to output a corresponding signal to the outside. The microprocessor is an STM8AF6223 microprocessor, an FSK output signal sent by the detection and rectification circuit is connected with the No. 19 terminal of the STM8AF6223 microprocessor, and an RF output signal sent by the detection and rectification circuit is connected with the No. 20 terminal of the STM8AF6223 microprocessor.

The output circuit is connected with the microprocessor and used for controlling the output circuit to output corresponding signals to the outside under the control of the microprocessor. The output circuit outputs an alarm signal A when the electromagnetic wave signal sent by the vehicle-mounted BTM is detected abnormally under the control of the microprocessor, outputs an alarm signal B when the electromagnetic wave signal sent by the responder is detected abnormally, and outputs a normal signal C when the electromagnetic wave signals sent by the responder and the vehicle-mounted BTM are detected normally. The output circuit adopts the chip AD421 as a 4-20mA/1-5V output circuit, and is connected with the No. 21 terminal, the No. 22 terminal and the No. 23 terminal of the STM8AF6223 microprocessor. The output signal may be in the form of: switching values, analog values, or data information communicated via a serial interface. The invention adopts the switching value as a signal, the No. 15 terminal, the No. 16 terminal and the No. 17 terminal of the microprocessor are connected with the relay circuit, the relay switch is controlled to suck up and fall down under the control of the microprocessor, and the alarm signal A, the alarm signal B and the normal signal C of the transponder are respectively indicated to display through the relay actions of the switching values J1, J2 and J3 in the relay circuit, so that the purpose of monitoring whether the transponder has a fault or not through the device is achieved.

The serial communication conversion circuit is connected with the No. 2 terminal and the No. 3 terminal of the STM8AF6223 microprocessor. The serial interface of the serial communication conversion circuit selects an ADM3251 chip and is used for transmitting data frame information of the transponder, namely the data frame information transmitted by the transponder is transmitted to an upper computer (an industrial calculator) through the serial communication conversion circuit and can be further analyzed.

As shown in fig. 4, the detection device of the present invention is placed on the transponder side inside the track and can be connected by a cable to an alarm controller installed in a remote control room, specifically in an electrical box outside the track or on a utility pole outside the track.