CN112622980B - Response positioning system suitable for shunting locomotive - Google Patents
Response positioning system suitable for shunting locomotive Download PDFInfo
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- CN112622980B CN112622980B CN202011291040.8A CN202011291040A CN112622980B CN 112622980 B CN112622980 B CN 112622980B CN 202011291040 A CN202011291040 A CN 202011291040A CN 112622980 B CN112622980 B CN 112622980B
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L1/00—Devices along the route controlled by interaction with the vehicle or train
- B61L1/02—Electric devices associated with track, e.g. rail contacts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L15/00—Indicators provided on the vehicle or train for signalling purposes
- B61L15/0018—Communication with or on the vehicle or train
- B61L15/0027—Radio-based, e.g. using GSM-R
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L23/00—Control, warning or like safety means along the route or between vehicles or trains
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L25/00—Recording or indicating positions or identities of vehicles or trains or setting of track apparatus
- B61L25/02—Indicating or recording positions or identities of vehicles or trains
- B61L25/025—Absolute localisation, e.g. providing geodetic coordinates
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- Automation & Control Theory (AREA)
- Train Traffic Observation, Control, And Security (AREA)
Abstract
The invention discloses a response positioning system suitable for a shunting locomotive, which comprises the following components: the system comprises a vehicle-mounted inquiry host, a vehicle-mounted antenna and a ground transponder; wherein: the vehicle-mounted inquiring host transmits carrier energy to the point transponder through a vehicle-mounted antenna to trigger the ground transponder to work; the ground transponder works to read pre-stored message data, performs PSK phase modulation and then sends the message data outwards; the vehicle-mounted inquiring host receives the modulated message data through the vehicle-mounted antenna, decodes and restores the message data in a PSK mode, and sends the message data to the vehicle-mounted STP control system after verification. The system uses a low-frequency wireless radio frequency technology aiming at the on-site low-speed environment of track shunting, adopts a PSK phase modulation mode to wirelessly transmit data, improves anti-interference performance, can also be used as timing information to synchronize clocks of a transmitter and a receiver by phase change, and plays a role in doubling transmission rate.
Description
Technical Field
The invention relates to the technical field of rail transit, in particular to a response positioning system suitable for a shunting locomotive.
Background
Along with the development of informatization construction of the marshalling stations, real-time tracking and positioning of the marshalling station shunting locomotives can be realized, support can be provided for marshalling station scheduling decision management, and safety protection information can be provided for site construction operators. The current railway rolling stock positioning technology mainly comprises a global GPS or Beidou system communication satellite positioning technology, a line electronic tag and rolling stock reader positioning technology, a ground transponder and rolling stock reader positioning technology and the like.
The positioning technology based on the ground transponder and the locomotive reader is an automatic recognition technology based on electromagnetic coupling excitation, the ground transponder encodes line data information, and is transmitted upwards in real time along with the passing of the train operation, instead of being stored on the locomotive and extracted according to the train operation coordinates, so that errors affecting the driving safety due to errors or human factors of stored data in the locomotive can be avoided. At present, the method has wide application in high-speed railways (the speed per hour is more than 250 kM/h) and urban rail transit systems at home and abroad, but is suitable for the research of response positioning transmission technology of shunting control (the speed per hour is less than 40 kM/h) of a railway marshalling station, and is still blank.
Disclosure of Invention
The invention aims to provide a response positioning system suitable for a shunting locomotive, which fills up the blank of a response positioning technology in shunting of a marshalling station and improves the anti-interference and digital transmission accuracy of wireless transmission;
the invention aims at realizing the following technical scheme:
a responsive positioning system for a shunting locomotive, comprising: the system comprises a vehicle-mounted inquiry host, a vehicle-mounted antenna and a ground transponder; wherein:
the vehicle-mounted inquiring host transmits carrier energy to the point transponder through a vehicle-mounted antenna to trigger the ground transponder to work; the ground transponder reads pre-stored message data to perform PSK phase modulation and then sends the message data outwards; the vehicle-mounted inquiring host receives the modulated message data through the vehicle-mounted antenna, decodes and restores the message data in a PSK mode, and sends the message data to the vehicle-mounted STP control system after verification.
According to the technical scheme provided by the invention, a low-frequency-band wireless radio frequency technology is used for a field low-speed environment of the track shunting, a PSK phase modulation mode is adopted for wireless data transmission, the anti-interference performance is improved, the phase change can also be used as timing information for synchronizing clocks of a transmitter and a receiver, and the transmission rate is doubled.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a response positioning system suitable for a shunting locomotive, provided by an embodiment of the invention;
FIG. 2 is a working schematic diagram of a response positioning system suitable for a shunting locomotive according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a crystal oscillator clock circuit according to an embodiment of the present invention;
fig. 4 is a schematic signal waveform diagram of an input/output rectifying and frequency dividing chip according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a driving circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of signal waveforms according to an embodiment of the present invention;
FIG. 7 is a graph of a positive and negative voltage waveform at two input ends of a transformer measured by an oscilloscope stylus according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a vehicle antenna according to an embodiment of the present invention;
FIG. 9 is a simplified schematic diagram of an electromagnetic transmitting portion according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a waveform extraction circuit according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of a waveform amplifying circuit according to an embodiment of the present invention;
fig. 12 is a schematic diagram of a waveform shaping and sampling circuit and a phase sampling circuit according to an embodiment of the present invention;
FIG. 13 is a diagram of an original data waveform and a demodulated data waveform according to an embodiment of the present invention;
FIG. 14 is a schematic view of a ground transponder according to an embodiment of the present invention;
FIG. 15 is a schematic diagram of a transponder inductive power supply circuit according to an embodiment of the present invention;
fig. 16 is a circuit diagram of a ground transponder according to an embodiment of the present invention, including reading, modulating, and transmitting message data;
fig. 17 is a schematic diagram of phase change in data change according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
The embodiment of the invention provides a response positioning system suitable for a shunting locomotive, which is a technical scheme of a railway locomotive vehicle positioning technology suitable for a wireless shunting locomotive signal monitoring system (STP system for short). The wireless shunting locomotive signal and monitoring System (STP) is used for the safety protection of shunting operation of railway stations, and is now a core component of the railway shunting safety protection technical system in China. In the STP technical system, train position identification is a basic and core technology for realizing shunting control. The ground response positioning transmission technology based on track installation is the optimal scheme for STP train position identification.
As shown in fig. 1, it mainly includes: the system comprises a vehicle-mounted inquiry host, a vehicle-mounted antenna and a ground transponder; wherein:
the vehicle-mounted inquiring host transmits carrier energy to the point transponder through a vehicle-mounted antenna to trigger the ground transponder to work; the ground transponder reads pre-stored message data to perform PSK phase modulation and then sends the message data outwards; the vehicle-mounted inquiring host receives the modulated message data through the vehicle-mounted antenna, decodes and restores the message data in a PSK mode, and sends the message data to the vehicle-mounted STP control system after verification.
The following exemplary technical indexes of the answer positioning system are given:
1) The vehicle-mounted equipment transmits an energy carrier frequency signal: 256Khz;
modulation mode of transmission signal: PSK (phase shift keying);
vehicle-mounted antenna: a full duplex rectangular directional antenna;
operating voltage of the device: 110VDC
Communication interface: communication rate between RS-485 and station host unit is 9600bps
2) Ground transponder: rectangular directional antenna
The data processing mode is as follows: PSK signal demodulation and data processing;
data uplink propagation rate: 128kbps
Carrier frequency: 1.664Mhz
The system for positioning the shunting locomotives of the marshalling stations is considered, the speed of the shunting locomotives is limited in the marshalling stations according to the characteristics of the railways, the running paths of the shunting locomotives are relatively fixed, namely, the positioning data of the transponders are fixed, and the ground transponders can be conveniently installed.
In the embodiment of the invention, the ground transponder is a passive transponder, the ground transponder is activated to work through carrier energy, an uplink signal carrying a response positioning message is sent out after the ground transponder is activated, the vehicle-mounted inquiring host receives the signal through an air gap by a vehicle-mounted antenna, an error-free transponder message is formed through a demodulation and decoding functional module in the vehicle-mounted inquiring host, and transponder information is provided for a vehicle-mounted computer through a serial interface. The response positioning system can be applied to a railway station shunting safety protection system, can adapt to safety protection aiming at shunting operation of a plurality of locomotives at the same station, and can realize accurate positioning of locomotive positions. The vehicle-mounted control computer can calculate the braking distance from the front protection point according to the train position information, the current speed and other information, and calculate the current control mode curve according to the braking distance. When the speed of the locomotive exceeds the speed limit value of the mode curve, a braking instruction is sent out, and the safety protection function is achieved.
In the embodiment of the invention, a PSK (phase shift keying) technology is adopted, and the technology utilizes the change of the relative phase of carriers between symbols before and after a modulated signal to transfer information. The performance of the chaotic communication system can be effectively improved, and the signal hiding performance can be improved. The PSK modulation technology has stronger anti-interference capability than the traditional FSK (frequency shift keying) response technology, is suitable for playing the function of data transmission in a complex railway station shunting environment, can be used as timing information for synchronizing clocks of a transmitter and a receiver, and has the effect of doubling the transmission rate.
As shown in fig. 2, the main operation principle of the system is shown, and the internal structure of each component is described in detail below in combination with the operation principle.
1. And a vehicle-mounted part.
The vehicle-mounted part comprises a vehicle-mounted inquiry host and a vehicle-mounted antenna.
The vehicle-mounted inquiry host comprises: a carrier energy generating circuit, a decoding circuit and a control circuit; the carrier energy generating circuit and the vehicle-mounted antenna are combined to form a carrier energy transmitting circuit for transmitting carrier energy; the decoding circuit is used for decoding the restored message data in a PSK mode; and the control circuit is used for verifying the restored message data and transmitting the verified message data to the vehicle-mounted STP control system.
1. And a carrier energy transmitting circuit.
The carrier energy transmitting circuit adopts a special power module to convert the power supplied by the external locomotive into various voltages required by the internal circuit. The carrier energy generating circuit mainly includes: the device comprises a crystal oscillator, a rectifying and frequency dividing chip, a D trigger, an MOS tube, a transformer, a capacitor and an inductor.
As shown in fig. 3, a standard square wave signal (for example, a 4.096Mhz square wave signal) is initially generated by a crystal oscillator, the signal (as shown in fig. 4, the upper part is an input signal waveform, the lower part is an output signal waveform) is rectified and divided by a rectifying and frequency dividing chip (CD 4001, CD 4022), the signal is frequency-locked by a D trigger to generate a 256Khz waveform signal to drive a MOS tube, as shown in fig. 5, the signal waveform is a push-pull driving circuit, as shown in fig. 6, the CLK2 is a 512Khz waveform with a front-stage frequency division duty ratio of 1:8, the Q2 and Q2' are positive and negative waveforms output from the CLK2 waveform to the 1:1 generated by the D trigger, the J3 and J4 waveforms in fig. 6 are the output from the D trigger and the CLK2 waveform to enter the CD4001 for non-processing, the 256Khz waveform with a duty ratio of 7:16 is generated, the driving waveform duty ratio is less than 50%, and direct short circuit of power supply after two MOS tubes are simultaneously conducted is prevented.
The MOS tube forms an H bridge circuit to generate positive and negative voltage signals, and then the positive and negative voltage signals are isolated by a transformer T4, and a shaping loop is formed by a capacitor and an inductor to shape square waves into sine wave signals. As shown in fig. 7, a graph of positive and negative voltage waveforms across the input of the transformer is measured for an oscilloscope stylus.
Then, the capacitance and inductance of the vehicle antenna are subjected to resonance amplification to generate carrier energy. In the embodiment of the invention, the capacitance and the inductance of the vehicle-mounted antenna adopt an LC resonance mode, the voltage amplitude is increased, and the inductance is a coil wound on the soft magnet by the enameled wire; when the electromagnetic wave power generation device works, the voltage of the induction coil changes according to the 256Khz frequency of the sine wave, and the electromagnetic wave power is converted into a magnetic field mode to transmit carrier energy; the capacitance of the vehicle-mounted antenna determines the capacitance value according to the following formula:
wherein L is the inductance value (uH) of the vehicle-mounted antenna; c is the capacitance (pF), fo is the carrier energy (MHz).
As shown in fig. 8, which is a schematic diagram of a vehicle-mounted antenna, the upper part in fig. 8 is a ferrite core around which enameled wires are wound to form an inductor, a middle coil and CA 1-CA 2 form a 256Khz energy transmitting antenna, and two side winding coils and CB 1-CB 3 form a 1.664Mhz receiving antenna. The lower PCB in fig. 8 is used to solder fix the capacitor. As shown in fig. 9, a simplified schematic diagram of the electromagnetic transmitting portion is provided. The winding inductance value of the magnetic field energy transmission loop of the middle coil on the soft magnetic body is actually measured to be about L=390 uH, the inductance value is related to the tightness degree of the winding process, and once the winding inductance value is wound, the winding inductance value is not adjustable. At this time, in order to assist resonance, a proper capacitance value of the capacitor on the vehicle antenna needs to be selected according to a formula, and when fo is 256khz and l=390 uH, the capacitance value CA1+ CA 2=992 pF is obtained by taking the above formula.
2. A decoding circuit.
The decoding circuit includes: a waveform extraction circuit, a waveform amplification circuit, a waveform shaping and sampling circuit, and a phase sampling circuit; the waveform extraction circuit extracts the waveform of the message with the frequency of 1.664Mhz by utilizing an LC resonance principle, the waveform is amplified by the waveform amplification circuit, the waveform shaping and sampling circuit samples the data waveform by utilizing the synchronization of the sampling frequency of 3.33Mhz, the position of the phase change of 1.664Mhz is analyzed, the phase sampling circuit extracts the actual message data with the frequency of 128KHZ, and the demodulation process of PSK is completed. Specifically:
the waveform extraction circuit adopts capacitance and inductance to carry out first-stage resonance to separate out a frequency band of 1.664Mhz, and a resonance calculation formula is as follows:
as shown in fig. 10, the T0 transformer in fig. 10 connects the isolation external connection with the internal circuit of the board, ensures the circuit safety, enhances the driving capability through the triode Q1, forms the first-stage resonance with the input side inductor of the transformer T1 by adopting the capacitors VC1 and C7 on the board, and isolates the waveform after resonance into the TP0 signal through the magnetic coupling of the transformer. LC resonance extracts and amplifies the 1.664Mhz signal, and adopts the capacitor c=c7+vc1=200f+5=68pf=268 PF, and the adjustable range of the inductance value at the input side of the transformer T1 is 32 to 39uH. The inductance T1 is taken to be a typical value of 34uH, and is brought into the above formula to obtain fo approximately 1.664MHz.
The useful signal extracted at this time has a weak amplitude, and is amplified 13 times by the operational amplifier AD8055 in the waveform amplifying circuit and subjected to second-stage resonance amplification, as shown in fig. 11. In fig. 11, the capacitor C8 filters out the dc component in the TP0 signal, and the op-amp AD8055 uses a 12V single power supply, so that the op-amp input signal is designed to be 6V dc, and r6=100deg.OMEGA, r7=1200Ω, which constitutes a 13-fold op-amp, and the capacitors VC2 and C12 and the inductor 1L form a second-stage resonance to amplify the signal, and output the signal TP1.
As shown in fig. 12, the signal TP1 subjected to the secondary resonance enters a waveform shaping and sampling circuit, is shaped by a schmitt trigger, drives a transformer T2 to generate an energy driving crystal to generate a synchronous square waveform TP3 of 3.33Mhz, and is frequency-locked by a D trigger U2 to form a synchronous sampling signal of 1.664 Mhz; the phase sampling circuit performs exclusive or calculation phase comparison on the waveform of 1.664Mhz of the message to extract effective data waveforms. The data waveform is sent to the control circuit and converted into a digital signal by the FPGA chip.
As shown in fig. 13, channel 2 is the original waveform of 1.664Mhz extracted in the first-stage resonance, and channel 1 is the read valid data waveform.
3. And a control circuit.
The control circuit includes: the data shaping circuit, the FPGA chip, the singlechip and the data interface; the demodulated data waveform output by the decoding circuit is sent to the FPGA chip for collection after passing through the data shaping circuit, then the singlechip judges whether the data is correct or not, and the correct data is output to the vehicle-mounted STP control system by using the data interface.
The FPGA chip may use parallel data buses P0-P7 to transmit to the single-chip microcomputer ATMEGA64, where the single-chip microcomputer checks the message data, determines whether the message is correct, and sends the correct message to the STP control system through the serial port (RS 485). The serial circuit adopts a high-speed optocoupler to carry out voltage isolation, and the MAX485 chip carries out voltage conversion, so that the safety of data transmission is ensured, and the internal circuit is protected.
2. A ground transponder.
In the embodiment of the invention, the ground transponder is a passive transponder, and as shown in fig. 14, the ground transponder is a physical schematic diagram. In fig. 14, the upper part is a ferrite core, the enameled wire is wound on the ferrite core to form an inductance, the middle coil and the capacitor in the lower part PCB board form a 256Khz energy receiving antenna, and the two side winding coils and the capacitor in the board form a 1.664Mhz signal transmitting antenna. The lower PCB in fig. 14 is the energy harvesting, message storage, signal modulation and transmission circuit board. The passive transponder is charged by adopting an electromagnetic induction principle, receives magnetic field energy emitted by a train-mounted antenna, converts the magnetic field energy into electric energy and supplies power for the circuit board.
The ground transponder mainly comprises: coil inductance, capacitance, inductive circuit, phase-locked loop circuit, EEPROM chip, exclusive-OR gate, and three-stage tube around the soft magnetic body.
The ground transponder is matched with the coil inductor by adopting a capacitor, and inductive carrier energy generates electric energy to supply power for the ground transponder.
The induction circuit is shown in fig. 15, and the circuit adopts an in-board CA capacitor and 7 pins and 10 pins of a coil inductor L wound on a soft magnet, magnetic field energy emitted by an induction receiving antenna is converted into a voltage signal, the voltage signal is shaped through a diode V2, a voltage stabilizing tube V3 is stabilized and a capacitor C01 is filtered to generate a stable direct current voltage to carry out voltage conversion on TPS7113QP, and then the first-stage TPS7113QP is connected to carry out secondary voltage stabilization, so that the voltage is more stable.
In addition, the message data is written into an EEPROM chip (93 LC 86) in a wired mode through a response positioning reader-writer in advance, an energy carrier signal emitted by a receiving antenna is sensed during operation, the locator rectifies the energy carrier to generate the required 3.3V voltage in the board, the board is electrified to start operation, the message data of the EEPROM chip is automatically transmitted, and the magnetic field is generated through a soft magnet to radiate outwards after carrier processing. Specifically, as shown in fig. 16, the message data is written into the EEPROM chip IC5 through the CX1 aviation interface by wire, the 256Khz energy carrier induced by the intermediate coil during operation generates a 128Khz square wave signal after frequency division and frequency locking by the D flip-flop IC1, then generates a carrier wave waveform (TP 1) of 1.664MHz and a data clock waveform (TP 2) of 128Khz by a phase-locked loop circuit (composed of 74HC4046 chips), and reads the message data stored in the EEPROM chip by using the 128Khz data clock waveform, specifically: TP2 (128 Khz) enters a clock pin CLK of the EEPROM chip after being shaped, and under the conditions that power supply is normal and an enabling pin is effective, 4 pins of the EEPROM output stored message data DO, and the message data transmission rate is 128Khz. And (3) after being shaped, the data signal DO output by the EEPROM chip and the 1.664Mhz carrier wave waveform are subjected to PSK phase modulation through an exclusive-OR gate, the modulated waveform signal drives a triode, the voltage change of a transmitting coil is changed, and the magnetic field outwards radiates message data.
As shown in two parts (a) to (b) of fig. 17, the waveform diagram of data modulation is that the channel 2 at the bottom is a standard 1.664Mhz waveform, the channel 3 at the middle is a data waveform, and the channel 1 at the top is a modulated waveform after exclusive or gate. It can be seen that PSK phase modulation produces a phase change as the data changes.
It should be noted that the specific circuit structures of the circuits provided in the embodiments of the present invention are examples, and are not limiting; in practical applications, a user may select a circuit with a specific structure to perform related operations or processing flows according to practical situations.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (5)
1. A responsive positioning system for a shunting locomotive, comprising: the system comprises a vehicle-mounted inquiry host, a vehicle-mounted antenna and a ground transponder; wherein:
the vehicle-mounted inquiring host transmits carrier energy to the point transponder through a vehicle-mounted antenna to trigger the ground transponder to work; the ground transponder reads pre-stored message data to perform PSK phase modulation and then sends the message data outwards; the vehicle-mounted inquiring host receives the modulated message data through the vehicle-mounted antenna, decodes and restores the message data in a PSK mode, and sends the message data to the vehicle-mounted STP control system after verification;
wherein, on-vehicle inquiry host computer includes: the carrier energy generating circuit is combined with the vehicle-mounted antenna to form a carrier energy transmitting circuit for transmitting carrier energy; the carrier energy generation circuit includes: the device comprises a crystal oscillator, a rectifying and frequency dividing chip, a D trigger, an MOS tube, a transformer, a capacitor and an inductor; the method comprises the steps of generating a standard square wave signal by a crystal oscillator, rectifying and dividing the standard square wave signal by a rectifying and dividing chip, driving an MOS tube to generate a positive voltage signal and a negative voltage signal after frequency locking by a D trigger, isolating the positive voltage signal by a transformer, and forming a shaping loop by a capacitor and an inductor to shape the square wave into a sine wave signal; then, carrying out resonance amplification by using the capacitance and the inductance of the vehicle-mounted antenna to generate carrier energy;
the vehicle-mounted query host computer further comprises: the control circuit is used for verifying the restored message data and sending the verified message data to the vehicle-mounted STP control system; the control circuit includes: the data shaping circuit, the FPGA chip, the singlechip and the data interface; the demodulated data waveform output by the decoding circuit is sent to the FPGA chip for collection after passing through the data shaping circuit, then the singlechip judges whether the data is correct or not, and the correct data is output to the vehicle-mounted STP control system by using the data interface.
2. The response positioning system for a shunting locomotive according to claim 1, wherein the on-board inquiring host further comprises: a decoding circuit;
the decoding circuit is used for decoding the restored message data in a PSK mode.
3. A responsive positioning system for a shunting locomotive as defined by claim 1, wherein,
the crystal oscillator generates a 4.096Mhz square wave signal, and the D trigger generates a 256Khz waveform signal after frequency locking;
the capacitance and the inductance of the vehicle-mounted antenna adopt an LC resonance mode, the voltage amplitude is increased, and the inductance is a coil wound on the soft magnet by the enameled wire; when the electromagnetic wave power generation device works, the voltage of the induction coil changes according to the 256Khz frequency of the sine wave, and the electromagnetic wave power is converted into a magnetic field mode to transmit carrier energy; the capacitance of the vehicle-mounted antenna determines the capacitance value according to the following formula:
wherein L is the inductance value of the vehicle-mounted antenna; c is the capacitance value, fo is the carrier energy value.
4. A responsive positioning system for a shunting locomotive as defined by claim 2, wherein said decoding circuit comprises: a waveform extraction circuit, a waveform amplification circuit, a waveform shaping and sampling circuit, and a phase sampling circuit;
the waveform extraction circuit extracts the waveform of the message with the frequency of 1.664Mhz by utilizing an LC resonance principle, the waveform is amplified by the waveform amplification circuit, the waveform shaping and sampling circuit samples the data waveform by utilizing the synchronization of the sampling frequency of 3.33Mhz, the position of the phase change of 1.664Mhz is analyzed, the phase sampling circuit extracts the actual message data with the frequency of 128KHZ, and the demodulation process of PSK is completed.
5. A transponder positioning system for a shunting locomotive according to claim 1, wherein the ground transponder comprises: coil inductance, capacitance, induction circuit, phase-locked loop circuit, EEPROM chip, exclusive-OR gate and triode wound on the soft magnetic body;
the ground transponder is matched with the coil inductor by adopting a capacitor, and inductive carrier energy generates electric energy to supply power for the ground transponder;
the sensing circuit and the phase-locked loop circuit generate a carrier waveform of 1.664MHz and a data clock waveform of 128Khz, the data clock waveform of 128Khz is utilized to read message data stored in the EEPROM chip, the data signal DO output by the EEPROM chip and the carrier waveform of 1.664Mhz are subjected to PSK phase modulation through an exclusive-OR gate, the modulated waveform signal drives a triode, the voltage change of the coil inductance is changed, and the message data is radiated outwards by a magnetic field.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011291040.8A CN112622980B (en) | 2020-11-18 | 2020-11-18 | Response positioning system suitable for shunting locomotive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011291040.8A CN112622980B (en) | 2020-11-18 | 2020-11-18 | Response positioning system suitable for shunting locomotive |
Publications (2)
| Publication Number | Publication Date |
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| CN113928373A (en) * | 2021-11-09 | 2022-01-14 | 交控科技股份有限公司 | Train positioning method and system |
| CN114954575B (en) * | 2022-06-29 | 2024-03-12 | 宁波极晋科技开发有限公司 | Vehicle-ground information transmission system and accurate positioning method |
| CN115240295B (en) * | 2022-07-25 | 2024-03-22 | 沈阳铁路信号有限责任公司 | Data recording and processing method of vehicle-mounted response locator receiving module |
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