CN201457422U

CN201457422U - Spot responder based on CTCS standard

Info

Publication number: CN201457422U
Application number: CN2009201099269U
Authority: CN
Inventors: 陈小英; 柴书灵; 张智彬; 贺觅知
Original assignee: BEIJING XIDIAN INFORMATION TECHNOLOGY Co Ltd
Current assignee: Beijing Jinhong Xidian Information Technology Co., Ltd.
Priority date: 2009-07-10
Filing date: 2009-07-10
Publication date: 2010-05-12
Anticipated expiration: 2019-07-10

Abstract

A spot responder based on the CTCS (China Train Control System) standard comprises an induction antenna unit, a filter unit with the bandstop of 27.095 MHz, a filter unit with the bandstop of 4.234 MHz, a rectification unit, a FSK transmission unit, an energy overload protection unit and a responser control unit, wherein the FSK transmission unit comprises an oscillator unit, a variable capacity modulation unit and a responser fixing and heat preservation generation unit; signal data generated by the responser is in the form of sinusoidal wave after passing through a variable capacity modulation circuit and the oscillator unit; the variable capacity modulation unit is a resonance circuit, and the capacitance of the resonance circuit consists of a first capacitance, a second capacitance and a third capacitance which are connected in series. The spot responder has the advantages of simple and compact structure, strong anti-interference capability, low cost and power consumption, and quick respondance.

Description

Dot-mode transponder based on the CTCS standard

Technical field

The utility model is mainly concerned with the control field of railway locomotive safety apparatus, refers in particular to a kind of dot-mode transponder based on the CTCS standard.

Background technology

Along with improving constantly of train running speed, the further increasing of operation density, railway transportation is more and more higher to the requirement of train control system, and existing installation is because with low content of technology, and its controllable function but fails to obtain best performance.In the rail transportation system abroad, basically all be to use special-purpose wayside equipment that the absolute location information of train is provided to onboard system, this equipment is exactly the TV responser, ERTMS/ETCS (the European railway transport administration system/European Train Control System) system in Europe is most advanced in the world at present, the train control system of system, the railway department has been formulated the standard (CTCS standard) of Chinese train control system with reference to the requirement of ERTMS/ETCS, in this standard, dot-mode transponder is a key device in the system in the fix information responser of ground, because the degree of automation that it will make Train Control system vomit that is further enhanced, page or leaf will make the development level of China ATC system stride forward to higher level.

But present dot-mode transponder generally exists power consumption big, and the corresponding time is long, cost is high, complex structure and other problems.

The utility model content

The problem that the utility model exists at prior art, the utility model provide a kind of simple and compact for structure, antijamming capability is strong, cost is low, power consumption is little, corresponding fast and modulation and one a kind of based on CTCS standard dot-mode transponder.

Based on the dot-mode transponder of CTCS standard, form by induction antenna unit, band resistance 27.095MHz filter cell, band resistance 4.234MHz filter cell, rectification unit, FSK transmitting element, energy overload protection unit, responser control unit; The induction antenna unit is connecting band resistance 27.095MHz filter cell, band resistance 4.234MHz filter cell respectively, band resistance 4.234MHz filter cell is connected successively with, rectification unit, responser control unit, FSK transmitting element, and band hinders the 27.095MHz filter cell and is connected with the FSK transmitting element;

It is characterized in that the FSK transmitting element comprises fixedly message generation unit of oscillator unit, transfiguration modulating unit and responser; The signal that sends out behind signal data process transfiguration modulation circuit that responser generates and the oscillating unit is the sinusoidal waveform form; The transfiguration modulating unit is a resonant tank, and the electric capacity of described resonant tank is composed in series by first capacitor bank, second capacitor bank and the 3rd capacitor bank.Described energy overload protection unit is connected on the band resistance 4.234MHz filter cell; Be connected with the responser control unit by rectification unit successively by band resistance 4.234MHz filter cell after the induction antenna unit received signal, after information data is handled, send to train by FSK transmitting element, band resistance 27.095MHz filter cell antenna element successively.

In the described transfiguration modulating unit, the second capacitor bank two ends are connected to form the path with switching effect by the circuit that MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-oxide layer-quartz conductor-field-effect transistor) forms.

Oscillator unit in the described FSK transmitting element is a pierce circuit, and electric signal is a sinusoidal waveform through the data that oscillating circuit directly sends.

That the main control chip of described responser control circuit is selected for use is the FPGAAGL060 of the IGLOO series of Actel production.

The advantage of the dot-mode transponder based on the CTCS standard described in the utility model is: simple in structure, with low cost, all need oscillator in most of at present dot-mode transponder product based on the CTCS standard, and the information transceiving device of the dot-mode transponder based on the CTCS standard described in the utility model does not need oscillator, with oscillator design is pierce circuit, reduce cost, and information data is through directly forming sinusoidal waveform behind the oscillating circuit; Owing in the FSK transmitting element, increased the transfiguration modulating unit, make the dot-mode transponder based on the CTCS standard described in the utility model structurally simpler, cost is also lower; Increased the energy overload protection unit of being made up of many groups diode in band resistance 4.234MHz filter cell, actv. has consumed overcurrent, guarantees the safe handling of equipment; The choose reasonable of responser control unit chip has reduced energy consumption and corresponding time.

Description of drawings

Fig. 1 is the framed structure scheme drawing based on the dot-mode transponder of CTCS standard

Fig. 2 is the transfiguration modulating unit structural representation based on the dot-mode transponder of CTCS standard

Fig. 3 is the responser control unit schematic circuit diagram based on the dot-mode transponder of CTCS standard

In Fig. 2: 1, first capacitor bank; 2, second capacitor bank; 3 the 3rd capacitor bank.

Embodiment

As shown in Figure 1, dot-mode transponder based on the CTCS standard is made up of induction antenna, band resistance 27.095MHz filter cell, band resistance 4.234MHz filter cell, rectification unit, FSK transmitting element, energy overload protection unit, responser control unit, and wherein the FSK transmitting element comprises fixedly message generation unit of oscillator unit, transfiguration modulating unit and responser; Energy overload protection unit is connected on the band resistance 4.234MHz filter cell; Be connected with the responser control unit by rectification unit successively by band resistance 4.234MHz filter cell after the induction antenna received signal, after information data is handled, send to train by FSK transmitting element, band resistance 27.095MHz filter cell induction antenna successively.

As shown in Figure 2, the transfiguration modulating unit is an oscillation circuit, the electric capacity of described oscillation circuit is made up of first capacitor bank, second capacitor bank and three groups of electric capacity of the 3rd capacitor bank, the second capacitor bank two ends are connected to form the circuit with switching effect by the circuit that MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-oxide layer-quartz conductor-field-effect transistor) forms.

The responser control unit produces the data of the required transmission of responser, drive with described data and to be connected the circuit that the second capacitor bank two ends have switching effect, when switch closure, with the capacitor bank of switch in parallel by short circuit, the total capacitance value of resonant tank becomes big so, thereby the resonant frequency of whole resonant tank diminishes, and forms lower side frequency 3.951MHz; When switch opens, be linked in the middle of the resonant tank with the capacitor bank of switch in parallel, the total capacitance value of resonant tank diminishes so, and is big thereby the resonant frequency of whole resonant tank becomes, and forms upper side frequency 4.516MHz; Under the control of responser controller unit, the oscillation frequency of oscillating circuit will change along with the difference of data, thereby has realized the FSK modulation.

In this device, fixedly form by message generation circuit, transfiguration modulation circuit and pierce circuit by responser for the FSK transmitting element, signal data by responser fixedly message produce circuit and produce the coherent signal data,, after directly becoming the sinusoidal waveform form with signal data, oscillating circuit sends on the train through band resistance 27.095MHz filter cell, induction antenna successively then through the transfiguration modulation circuit.

Responser causes damage in order to prevent that transient energy is excessive to responser at work; in the energy loop, need to add overload protecting circuit; described circuit adopts diode rectifier circuit to carry out rectification to receiving energy signal; after the rectification direct current signal is added to P-MOSFET and goes up the negative pole of a termination rectifying circuit diode of the source electrode of metal-oxide-semiconductor and resistance; the grid connecting resistance other end of metal-oxide-semiconductor also connects the negative pole of a zener diode; the drain electrode of metal-oxide-semiconductor and the positive pole of zener diode are received the positive pole of rectifying circuit diode; between the grid of metal-oxide-semiconductor and source electrode, just formed a negative voltage so; when this negative voltage reaches certain value; the metal-oxide-semiconductor conducting; the capacitor bank in parallel with metal-oxide-semiconductor will be by short circuit; the former part that belongs to antenna energy loop matching circuit of this capacitor bank; when capacitor bank by short circuit; matching circuit is destroyed; antenna just can not absorb energy efficiently so, has so just reached the effect of protective circuit.

As shown in Figure 3, this figure is based on the responser control unit schematic circuit diagram in the information transceiving device of the dot-mode transponder of CTCS standard.That main control chip is selected for use is FPGA (the Field-Programmable Gate Array of super low-power consumption, field programmable gate array), this part circuit is made up of power supply, ferroelectric memory, clock shaping circuit and FPGA, and wherein the model selected for use of ferroelectric memory is FM25L04.Concrete working process is: when responser receives energy signal 27.095MHz, produce direct supply by coupling with resonant tank and rectifying circuit, power for whole responser with this power supply, to take out the master clock of clock signal 27.095MHz from antenna simultaneously as sequential circuit, because the signal on the antenna is near sinusoidal waveform, and FPGA need of work dagital clock signal, so the 27.095MHz signal that antenna need be received is made into digital signal by shaping circuit, this clock signal is just as the work clock of FPGA afterwards, and the radical function of FPGA reads from the memory device ferroelectric memory exactly fixedly that message sends by the FSK modulation circuit.Interface between FPGA and the ferroelectric memory is SP worker's mode, and this chip is the work in series mode, and external interface is exactly SPI, and FPGA reads fixedly message rear drive FSK circuit the message modulation is sent, and so far responser has been finished once action.

Claims

1. based on the dot-mode transponder of CTCS standard, form by induction antenna unit, band resistance 27.095MHz filter cell, band resistance 4.234MHz filter cell, rectification unit, FSK transmitting element, energy overload protection unit, responser control unit; The induction antenna unit is connecting band resistance 27.095MHz filter cell, band resistance 4.234MHz filter cell respectively, band resistance 4.234MHz filter cell is connected successively with, rectification unit, responser control unit, FSK transmitting element, band resistance 27.095MHz filter cell is connected with the FSK transmitting element, and the protecting energy unit is connected on the band resistance 4.234MHz filter cell;

It is characterized in that the FSK transmitting element comprises fixedly message generation unit of oscillator unit, transfiguration modulating unit and responser; The signal that sends out behind signal data process transfiguration modulation circuit that responser generates and the oscillating unit is the sinusoidal waveform form; The transfiguration modulating unit is a resonant tank, and the electric capacity of described resonant tank is composed in series by first capacitor bank, second capacitor bank and the 3rd capacitor bank.

2. the dot-mode transponder based on the CTCS standard as claimed in claim 1 is characterized in that in the described transfiguration modulating unit, the circuit that the second capacitor bank two ends are made up of MOSFET is connected to form the path with switching effect.

3. the dot-mode transponder based on the CTCS standard as claimed in claim 1 is characterized in that the oscillator unit in the described FSK transmitting element is a pierce circuit.

4. the dot-mode transponder based on the CTCS standard as claimed in claim 1, that it is characterized in that the main control chip of described responser control circuit selects for use is the FPGA AGL 060 of the Actel IGLOO series of producing.