JP2006060434A - Train wireless communication system, and ground station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To configure a train wireless communication system having stabilized wireless circuit quality by eliminating the impact of noise, e.g. multipath fading. <P>SOLUTION: In the train wireless communication system comprising a ground system 10 provided in a station, or the like, and a system 30 mounted on a train 20. The ground system 10 is provided with a radar 12 for measuring the distance to the train 20, and a memory 17 storing combination information of communication frequencies causing no multipath fading depending on the distance to the train. Information is transferred stably by wireless communication between the vehicle mounted system 30 and the ground system 10 without causing multipath fading regardless of movement of the train 20 when an optimal working frequency is read out from the memory 17 depending on the distance to the train 20 measured by means of the radar 12 and switched. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a train radio communication system and a ground station constituting the train radio communication system, and more particularly to a technology effective when applied to train operation management at a station.

  In recent years, complicated operation management has become necessary for the purpose of improving the safety of users at stations. For example, the opening and closing control of the safety fences of the home linked to the arrival, departure, passage of trains, etc. It is getting done.

FIGS. 11A and 11B are a schematic side view and a schematic plan view showing a station platform door fence opening / closing system as a reference technique of the present invention.
The ground system includes a ground element 301, a ground element 302, an information transmission device 303, and a movable station platform fence control device 304, and the moving train 305 has an onboard element 306, an information transmission device 307, and a cab device. 308 is provided.

  When the train 305 passes or stops, the vehicle upper element 306 passes or stops on the ground element 301 and the ground element 302, and information is transmitted in this state.

The ground element 301 is mainly used to notify the vehicle upper element 306 of the absolute position, and is installed at a necessary place on the train track (rail 309).
The ground unit 302 transmits and receives data to and from the on-board system, confirms with the ground unit 302 that the train 305 has stopped at a fixed position, and controls the opening and closing of the station platform door fence by data communication from the cab device 308.

  The ground unit 302 and the vehicle upper unit 306 are used not only as a station platform door opening / closing system but also as an ATS (Automatic Train Stop) to ensure the safety of train operation.

  On the other hand, recently, more advanced various control using data communication such as transmission / reception of various data such as train number information and driver ID and transmission / reception of various data for passing trains in the contents of data communication performed on the ground system and on-board system. The need to do is increasing.

  As a method for inexpensively transmitting and receiving various data to and from passing trains and stopped trains, it is conceivable to use wireless transceivers for the ground system and on-board system, but when using microwave transceivers and millimeter-wave transceivers Multipath fading is expected to occur.

  Conventional methods for dealing with multipath fading include spatial diversity, polarization diversity, angle diversity, frequency diversity, etc. As a basic combined reception method, a comparison circuit that compares the received input level of each branch is used. Equipped with a selective synthesis method, a phase detection circuit and a phase circuit, and an equal gain synthesis method that combines the phases of the fading wave and a comparison circuit, phase detection circuit, and phase circuit to reduce the contribution of fading waves close to noise Thus, a maximum ratio combining method for receiving and combining is known.

  In addition, in recent years, as a vehicle position detection device, an in-vehicle radar using a low-cost and high-performance FM-CW method using a millimeter wave band is mounted on a general passenger car, and the relative distance and relative speed with the preceding vehicle are measured. It is used as a safety technique to reduce damage in the event of a collision with the vehicle ahead.

  In addition, as in Patent Document 1, correlation coefficient antenna switching information regarding spatial diversity control of each antenna with respect to the current position information of the train is stored in the memory of the antenna control device, and antenna switching is performed from a line monitor (line quality measuring device). A control system is known that reads out antenna switching information from its memory according to the current position information of a train and switches an antenna switching switch when a request is raised.

  The station platform door opening and closing system is a system that stops the train at a fixed position of the station platform by performing position notification to the train and data communication, and allows passengers to get on and off the train safely. When installing this system in Fig. 11 (b), it is necessary to lay the cable 301a such as the signal line and the power line and the cable 302a under the rail 309 when installing the ground elements 301 to 302. There are problems such as enormous construction costs.

  As a means for solving this cost problem, a method of constructing a station platform door rail opening / closing system by providing a wireless transmission / reception device to the ground system and the on-board system and transferring control information is conceivable. When a radio transmission / reception apparatus in the band or millimeter wave band is used, multipath fading due to a station structure or the like is expected.

  As a method of dealing with multipath fading, it is conceivable to use a selective combining method, an equal gain combining method, or a maximum ratio combining method for a wireless device, but in order to perform each method, a comparison circuit, a phase detection circuit, and a phase circuit are mounted. Therefore, there are problems such as an increase in circuit scale, an increase in size of the apparatus, and an increase in price.

  In the above-mentioned Patent Document 1, it is necessary to mount a circuit such as a position detection device, a timer, a distance calculator, a correlation coefficient calculator, a line monitor, etc. in order to configure the system. There are issues such as higher prices and higher prices.

Also, in the method of extracting the train position from the pulse obtained by the train passing the distance reference point with the distance calculator and the speed at that time and the elapsed time with the timer, when the rail gets wet due to ascending slope or rain An error may occur in the distance calculation due to the idling of the driving wheel, and the antenna switching may malfunction.To prevent the malfunction, a separate device for correcting the distance calculation due to idling is required, and the system configuration is more than necessary. To be complicated.
JP 7-162349 A

  The object of the present invention is to eliminate the influence of noise such as multipath fading without increasing the circuit scale of the wireless transmission / reception device, increasing the size of the device, and increasing the price, and stable wireless communication of train quality. The system is configured.

  Another object of the present invention is to provide a train radio communication system capable of constructing a train operation management system at low cost.

A first aspect of the present invention is a train radio communication system that performs radio communication between a ground station installed on the ground side and a mobile station mounted on the train side,
The ground station includes a wireless communication device capable of switching a communication frequency with the mobile station to an arbitrary frequency, distance measuring means for measuring a relative distance from a train, and communication at the relative distance for each communication frequency. A train radio comprising: a memory device for storing a situation; and a control means for switching the communication frequency with the mobile station based on the stored contents of the memory device and the relative distance actually measured by the distance measuring means. A communication system is provided.

A second aspect of the present invention is a ground station that constitutes a train radio communication system that is installed on the ground side and performs radio communication with a mobile station mounted on the train side,
A wireless communication device capable of switching a communication frequency with the mobile station to an arbitrary frequency, distance measuring means for measuring a relative distance to a train, and a memory for storing a communication state at the relative distance for each communication frequency There is provided a ground station including a device, and control means for switching the communication frequency with the mobile station based on the stored contents of the memory device and the relative distance actually measured by the distance measuring means.

  According to the present invention, train radio communication with stable radio channel quality is achieved by eliminating the influence of noise such as multipath fading without increasing the circuit scale of the radio transmission / reception apparatus, increasing the size of the apparatus, and increasing the price. The system can be configured.

  It is also possible to construct a train operation management system at a low cost.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a conceptual diagram showing an example of the configuration of a train radio communication system according to an embodiment of the present invention, and FIG. 2 is a memory provided in the ground system constituting the train radio communication system of the present embodiment. It is explanatory drawing which shows an example of the information stored in an apparatus.

In the embodiment of FIG. 1, a case where an active method is used as a wireless method will be described.
The train radio communication system of the present embodiment includes a ground system 10 installed on the ground side such as a station building and an on-vehicle system 30 installed on the train 20.

  The ground system 10 includes a control device 11, a memory device 17, a distance measuring means including, for example, a radar device 12 and a radar antenna 12a, a wireless transmission device including a transmission unit 13c, a modulation unit 13a, and a VCO (Voltage Control Oscillator) 13b. 13, a radio receiver 14 including a receiver 14 a, a demodulator 14 c, and a VCO 14 b, a circulator 15, and a communication antenna 16 common to the radio transmitter 13 and the radio receiver 14.

  The modulation unit 13a of the wireless transmission device 13 uses a modulation scheme such as FSK (Frequency Shift Keying) and PSK (Phase Shift Keying), and the transmission unit 13c receives a local oscillation frequency in an RF (Radio Frequency) band from the VCO 13b. A configuration is used in which unnecessary waves are removed by a BPF (Band Pass Filter) after frequency conversion of the modulation signal to the RF band.

  The demodulation unit 14c of the wireless reception device 14 uses a demodulation method such as FSK or PSK, and after the unnecessary wave is removed by the BPF in the reception unit 14a, the local oscillation frequency of the RF band is received from the VCO 14b and the reception wave of the RF band is received. The structure etc. which frequency-convert are used.

Further, the VCO 13 b and VCO 14 b of the wireless transmission device 13 and the wireless reception device 14 can be set to desired frequencies under the control of the control device 11.
As illustrated in FIG. 2, the memory device 17 of the ground station (ground system 10) stores information on the relative distance 17a to the radar device 12 for each train (train number 17c) and the used frequency CH17b. 17d and stored for each reception frequency 17e.

  As for the information on the relative distance 17a to the radar device 12 for each train 20 and the transmission frequency 17d to be used, the data packet reception status or reception level for the relative distance 17a is measured in advance for each transmission frequency CH. Information to be stored in the memory device 17 is input.

  The control device 11 calculates the relative distance from the on-board system 30 at the time of data packet transmission / reception performed thereafter from the relative distance 17a of the train 20 input from the radar device 12 and the distance measurement result of the relative speed.

  After that, the control device 11 controls the transmission / reception frequency CH of the ground system 10 based on the calculated relative distance and the information on the used frequency CH stored in the memory device 17 and multipath fading avoidance frequency information (reception frequency). A data packet including a value (17d) and a transmission frequency value (17e) is generated and a transmission operation is performed.

In addition, notice time information may be included in the multipath fading avoidance frequency information.
The on-board system 30 includes a control device 31, a wireless transmission device 32, a wireless reception device 33, a circulator 34, and a communication antenna 35 common to the wireless transmission device 32 and the wireless reception device 33.

  The wireless transmission device 32 and the wireless reception device 33 use devices having the same configuration as the ground system 10. That is, the wireless transmission device 32 includes a modulation unit 32a, a VCO 32b, and a transmission unit 32c. The wireless reception device 33 includes a reception unit 33a, a VCO 33b, and a demodulation unit 33c.

  The control device 31 analyzes the received data packet and controls the VCO 32b of the wireless transmission device 32 and the VCO 33b of the wireless reception device 33 according to the contents of the multipath fading avoidance frequency information.

If the notice time information is included in the multipath fading avoidance frequency information, the switching control of the VCO 32b and the VCO 33b is performed after the notice time has elapsed.
According to the system configuration of the present embodiment described above, a train radio communication system that avoids multipath fading by a notice switching method without increasing the circuit scale of the radio transmission / reception apparatus, increasing the size of the apparatus, and increasing the price. Can be configured.

  Further, when a device capable of two-dimensional or three-dimensional beam scanning of the radar beam by a method such as mechanical scanning or electronic scanning is used as the radar device 12, the two-dimensional data is stored in the memory device 17 of the ground station (ground system 10). Alternatively, when the radio frequency CH that can be communicated with the position of the three-dimensional mobile station (on-vehicle system 30) is stored in advance, the movement of the mobile station (on-vehicle system 30) becomes two-dimensional or three-dimensional. However, a system that avoids multipath fading can be configured.

  FIG. 3 is a conceptual diagram showing a modification of the train radio communication system of the present embodiment. In the modification of FIG. 3, a case where a passive method and a transmission / reception antenna separation method are used as a wireless method will be described.

  The ground system 10 includes a control device 11, a memory device 17, a radar device 12, a radar antenna 12a, a radio transmission device 13 including a transmission unit 13c, a modulation unit 13a, and a VCO 13b, a reception unit 14a, and a demodulation unit 14c. A wireless receiving device 14, a transmitting antenna 16a, and a receiving antenna 16b.

  The wireless transmission device 13 uses, for example, FSK modulation for the modulation unit 13a and ON / OFF control of the RF signal from the VCO 13b using the RF band AMP for the transmission unit 13c, thereby performing FSK / AM (Frequency Shift Keying / Amplitude modulation) is used. Further, it is possible to set the desired transmission frequency by controlling the VCO 13b under the control of the control device 11.

The wireless receiver 14 receives the local oscillation frequency signal 13d from the VCO 13b of the wireless transmitter 13 and performs homodyne detection.
The on-board system 30 includes a control device 31, a wireless transmission device 32, a wireless reception device 33, a transmission antenna 35b, and a reception antenna 35a.

For example, the wireless reception device 33 has a configuration in which an envelope detection circuit is used for the reception unit 33a and FSK demodulation is used for the demodulation unit 33c.
Since the wireless transmission device 32 is supplied with the wireless carrier 40a from the ground system 10 and transmits data packets, the frequency information of the reception frequency 17e for avoiding multipath fading in the memory device 17 in the configuration of FIG. 1 is unnecessary. It becomes.

  3, the route of the direct wave 40 and the route of the reflected wave 41 from the ground system 10 to the on-board system 30, and the route of the direct wave 40 and the route of the reflected wave 41 from the on-vehicle system 30 to the ground system 10 Since the routes are different, it is necessary to select a transmission frequency 17d in which both radio propagations are not affected by multipath fading at each relative distance.

  According to the system configuration illustrated in FIG. 3 above, a train that avoids multipath fading by a notice switching method while suppressing an increase in the circuit scale and cost of the wireless transmission / reception apparatus further than in the configuration of FIG. A wireless communication system can be configured.

  Further, by using a system device in which the functions of the radar device 12 and the communication functions of the wireless transmission device 13 and the wireless reception device 14 are integrated, the ground station (ground system 10) can be further configured at low cost. Become.

  Further, the radar wave is amplified and returned to the on-board system 30 of the train 20 that receives the radar wave from the radar device 12, so that the distance to the train 20 and identification can be performed at a higher level. An active target function may be provided.

  When a large number of train numbers 17c (train IDs) are stored in the memory device 17, the mobile station installation ground height information indicating the installation ground height in the train 20 of the mobile station (on-board system 30) and the center of the train 20 are used. The lateral offset distance information indicating the lateral offset distance of the on-vehicle system 30 is included in the transmission packet from the mobile station (on-vehicle system 30), and the control device 11 on the ground station (ground system 10) side uses the mobile station. The installation ground height information and the lateral offset distance information from the train center are analyzed, and the installation position information of the mobile station (on-board system 30) is extracted.

By storing the installation position information and the transmission frequency information at the relative distance in the memory device 17 of the ground station (ground system 10), the storage capacity required for the memory device 17 can be reduced.
In addition, as described below, the switching between the radio frequency CH with respect to the relative distance d and the reception antenna of space diversity may be used in combination.

  FIG. 4 is a conceptual diagram showing a configuration example of a train radio communication system which is still another modified example of the present embodiment, and is an example using switching of the radio frequency CH and the spatial diversity reception antenna with respect to the relative distance d. .

In the description of FIG. 4, a case where a passive method and a transmission / reception antenna separation method are used as a wireless method will be described.
The radio reception device 14 of the ground system 10 includes a plurality of reception antennas 16c, a reception antenna 16d, and a changeover switch 14d. By switching the connection of the reception antenna 16c and the reception antenna 16d to the reception unit 14a, spatial diversity is achieved. It is carried out.

  FIG. 5 shows the relative distance 17a to the radar device 12 with respect to each train 20, the use frequency CH17b, and the use reception stored in the memory device 17 of the ground station (ground system 10) in the embodiment of FIG. It is the example of information which set the antenna 17f.

  Information on the relative distance d, the used transmission frequency, and the used receiving antenna 17f for each train 20 with respect to the radar apparatus 12 is received in advance for data packet reception for the relative distance d for all combinations of the individual used frequencies CH17b and the used receiving antennas 17f. The situation or the reception level is measured, and information stored in the memory device 17 is input based on the measurement result.

  The control device 11 calculates the relative distance from the on-board system 30 at the time of subsequent data packet transmission / reception from the relative distance d of the train 20 and the relative speed measurement result input from the radar device 12.

  Thereafter, the control device 11 determines the transmission frequency CH of the ground system 10 and the reception antenna 16c to be used based on the calculated relative distance d, the use frequency CH17b stored in the memory device 17, and the information of the use reception antenna 17f. Or the selection of 16d is controlled.

Other basic configurations of the ground system 10 and the on-vehicle system 30 are the same as the configuration example of FIG. 3 described above.
According to the system configuration described above, a train radio communication system that avoids multipath fading by a notice switching method while suppressing an increase in circuit scale and cost of the radio transceiver device than the configuration example of FIG. it can.

  Further, by using the distance measurement result of the radar apparatus 12 to control the spatial diversity for switching the reception antenna to be used to the reception antenna 16c or 16d, the means for avoiding multipath fading increases.

  With reference to FIG. 6, a configuration example when the train radio communication system of the present embodiment is applied to a station platform door fence opening / closing system will be described. In this case, as an example, the train radio communication system illustrated in FIG. 3 is used for the ground station and the mobile station.

  A platform 61 is provided at the station 60, and a rail 62 on which the train 20 travels is laid along the platform 61. A safety fence 54 is provided at an end edge along the rail 62 of the home 61. The safety fence 54 is provided with a plurality of station platform doors 53 at positions corresponding to a plurality of entrances (not shown) of the train 20 that stops at the platform 61. Each station platform door 53 is configured to be opened and closed by being driven by a drive motor 52.

  This drive motor 52 is connected to a movable station platform door fence control device 51 constituting the station management system 50, and the movable station platform door fence control device 51 can open and close individual station platform doors 53. It is controlled.

The ground station 10 (ground station) illustrated in FIG. 3 is connected to the movable station platform door fence control device 51.
The train 20 that travels on the rail 62 is provided with a cab device 21 that manages the operation of the train 20. The cab device 21 includes an on-board system 30 that constitutes a train radio communication system together with the ground system 10. Is connected.

  The movable station platform door fence control device 51 transmits / receives a door opening / closing signal to / from the cab device 21 of the train 20 via the train radio communication system and drives the drive motor 52 when receiving a door opening signal. The station platform door 53 is opened.

  The train radio communication system stores in advance the relative distance d between the train 20 approaching the station 60 and the ground system 10 and each radio frequency CH used in the memory device 17 of the ground station (ground system 10) before operation. There is a need. For this reason, the packet reception measurement of each radio frequency CH with respect to the relative distance shown in each of FIGS. 7 (a) to 7 (d) is performed, and as shown in FIGS. The selection result of the radio frequency CH that does not cause noise such as path fading is extracted and stored in the memory device 17.

  That is, in FIGS. 7A to 7D, the radio between the on-board system 30 of the train 20 approaching the station 60 and the ground system 10 for each of a plurality of radio frequencies (for example, CH1 to CH4). A packet reception state (reception power) of communication is measured, and a distance range in which the reception power is lower than a predetermined threshold due to, for example, multipath fading is defined as “reception interruption” (that is, an unusable range) (FIG. 7). (Hatching part of packet reception state).

  Then, as shown in FIG. 8A, the data of the actual measurement results of the packet reception states (reception power) of the plurality of frequencies CH1 to CH4 are arranged with the relative distance axes aligned, as shown in FIG. 8B. When these data are viewed in a direction crossing the relative distance axis, the memory device 17 uses the use frequency CH17b corresponding to the relative distance 17a so that CH1 to CH4 are switched while avoiding the hatched “reception interruption” distance range. Set.

  When the train radio communication system is actually operated, the use frequency CH17b for the relative distance 17a stored in the memory device 17 is read using the distance measurement result of the relative distance d of the radar device 12 of the ground station to the train 20, Each radio frequency CH is switched.

  In the case of the terrestrial system 10 having the configuration shown in FIG. 4, the received power is measured for each of the receiving antenna 16c and the receiving antenna 16d, and the memory device 17 including information on the used receiving antenna 17f as shown in FIG. And control to switch to a receiving antenna that does not cause “reception interruption”.

An operation flowchart of the ground system 10 during actual operation is shown in FIG. 9, and an operation flowchart of the on-board system is shown in FIG.
That is, the ground system 10 transmits a call packet to the on-board system 30 (on-board station) of the train 20 approaching the station 60 (step 201), and performs distance measurement on the train 20 by the radar device 12. (Step 202), the response packet from the on-board system 30 is received and it is determined whether the ID of the train 20 can be extracted (Step 203). It is determined whether the distance d and the relative speed have been detected (step 204). If the detection is successful, the relative distance L after T seconds is calculated from the relative distance d and the relative speed (step 205).

  Then, the use frequency CH17b corresponding to the ID of the train 20 and the value of the relative distance L is read from the memory device 17, and the frequency (CH) used for wireless communication between the ground system 10 and the onboard system 30 is switched. (Step 206), and the L and ID are reset (step 207).

  Then, information from the movable station platform door fence control device 51 is transmitted as an information packet to the on-board system 30 of the train 20 (step 208), an information packet of a response from the on-board system 30 is received, and the train 20 It is determined whether the ID has been extracted (step 209). If the extraction is successful, the received information (for example, information such as the type of train, operation diagram, destination) is transmitted to the movable station platform door fence control device 51 ( Step 210). Based on this information, for example, the movable station platform door fence control device 51 prepares for opening / closing the station platform door 53 corresponding to the entrance / exit of the train 20, and the arrival notice of the train 20 on the electric bulletin board on the platform 61. Control such as display, announcement, transmission of the image of the home 61 to the cab 21 of the train 20 is performed.

  If extraction of the ID of the train 20 fails in step 203 described above, the mobile station platform door fence control device 51 is notified of the failure of detection of the on-board system 30 (step 212), and the radio frequency to be used (CH) is switched cyclically and the processing after step 201 is retried (step 213).

  If the detection of the relative distance d and the relative speed with respect to the train 20 fails in step 204 described above, the mobile station platform door fence control device 51 is notified of the ranging failure (step 211), and the processing after step 201 is performed. Try again.

  On the other hand, as shown in the flowchart of FIG. 10, the on-board system 30 determines whether or not a call packet is received from the ground system 10 (step 221). A response packet including the ID of the train 20) is transmitted (step 222).

  If the call packet is not received from the ground system 10 in step 221, the reception of the information packet from the ground system 10 is determined (step 223). If the information packet is received, the information received from the ground system 10 is operated. The information is transmitted to the platform device 21 (step 224), and the information from the cab device 21 is transmitted to the ground system 10 as information including the ID of the own station (step 225).

If no information packet is received from the ground system 10 in step 223, step 221 and the subsequent steps are retried.
As described above, according to the embodiment of the present invention, the ground station (ground system 10) fixed on the ground and the mobile station (on-vehicle system 30) fixed on the train 20 traveling on the track such as the rail 62 are provided. ) Between the distance measured by the radar device 12 installed on the ground station and the relative speed, etc., and the relationship between the distance set in advance in the memory device 17 and the communication status. Based on the information, multipath fading occurs by predicting the occurrence and duration of multipath fading occurring in the structure of the station 60 with respect to the position of the mobile station, and switching the radio communication frequency CH. The train radio communication system between the station 60 and the train 20 can be configured with stable radio channel quality while avoiding the influence of the above as much as possible.

  Thus, for example, when a station management system 50 including a movable station platform door fence control device 51 is newly introduced into an existing station 60, a train that is not affected by multipath fading as in this embodiment. By exchanging various types of information between the station management system 50 and the train 20 in a wireless communication system, a complicated and expensive operation that requires a long period of time, such as newly installing a ground unit or cable on the track, etc. Is completely unnecessary, and the station management system 50 can be realized in a short time at a low cost.

  Further, in the present embodiment, the occurrence of multipath fading is predicted based on the measurement results of the distance and relative speed by the radar device 12 provided in the ground system 10, and the reception antenna for frequency CH and space diversity is switched. Therefore, stable wireless communication can be achieved without increasing the circuit scale, increasing the size of the device, and increasing the price in order to avoid multipath fading in the wireless transmission / reception device of the on-board system 30 mounted on the train 20 as a circuit. There is an effect that a train wireless communication system of line quality can be configured.

  Further, by performing all control of the radio frequency CH only on the ground system 10 side, the mobile station (on-board system 30) can be configured with a minimum number of radio transmission / reception devices and transmission / reception antennas. There is an effect that it can be made a small mobile station that is inexpensive and portable.

  Further, as in the configuration example of FIG. 4 of the present embodiment, the antenna directivity is switched by switching the frequency scanning method for switching the frequency used in the information set in the memory device 17 and the reception antenna 16c and the reception antenna 16d. In addition to avoiding the occurrence of multipath fading, the antenna directivity characteristics of the ground station and the mobile station can be changed by switching the radio frequency CH, thereby adjusting the communication opportunity with respect to the relative distance. Yes.

Needless to say, the present invention is not limited to the configuration exemplified in the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
(Appendix 1)
A train radio communication system that performs radio communication between a ground station installed on the ground side and a mobile station mounted on the train side,
The ground station includes a wireless communication device capable of switching a communication frequency with the mobile station to an arbitrary frequency, distance measuring means for measuring a relative distance from a train, and communication at the relative distance for each communication frequency. A memory device for storing the situation, and a control means for switching the communication frequency with the mobile station based on the stored contents of the memory device and the relative distance actually measured by the distance measuring means. A train radio communication system.

(Appendix 2)
In the train radio communication system according to appendix 1, the memory device stores a transmission frequency and a reception frequency as the communication frequency, and the control means does not generate the multipath fading according to the relative distance. A train radio communication system, wherein a radio frequency is selected by selecting a transmission frequency and / or a reception frequency.

(Appendix 3)
In the train radio communication system according to attachment 1, the mobile station has a function of transmitting installation position information indicating an installation position of the antenna of the mobile station in the train to the ground station together with the identification information of the mobile station. ,
The memory device stores identification information of the mobile station, transmission frequency and reception frequency as the communication frequency, and the installation position information,
The control means performs the wireless communication by selecting the transmission frequency and / or reception frequency at which the multipath fading does not occur according to the installation position information corresponding to the identification information and the relative distance. A train radio communication system.

(Appendix 4)
The train radio communication system according to claim 1, wherein the distance measuring means is a radar device.

(Appendix 5)
The train radio communication system according to appendix 1, wherein the distance measuring unit includes a radar device, and the radar device and the radio communication device are integrally formed.

(Appendix 6)
A ground station that constitutes a train radio communication system that is installed on the ground side and performs radio communication with a mobile station mounted on the train side,
A wireless communication device capable of switching a communication frequency with the mobile station to an arbitrary frequency, distance measuring means for measuring a relative distance to the train, and a communication state at the relative distance for each communication frequency are stored. A ground unit comprising: a memory device; and a control unit that switches the communication frequency with the mobile station based on the stored contents of the memory device and the relative distance actually measured by the ranging unit. Bureau.

(Appendix 7)
The ground station according to attachment 6, wherein the memory device stores a transmission frequency and a reception frequency as the communication frequency, and the control means transmits the transmission frequency at which the multipath fading does not occur according to the relative distance. And / or performing a radio communication by selecting a reception frequency.

(Appendix 8)
In the ground station according to appendix 6, the mobile station has a function of transmitting installation position information indicating an installation position of the antenna of the mobile station in the train to the ground station together with the identification information of the mobile station,
The memory device stores identification information of the mobile station, transmission frequency and reception frequency as the communication frequency, and the installation position information,
The control means performs the wireless communication by selecting the transmission frequency and / or reception frequency at which the multipath fading does not occur according to the installation position information corresponding to the identification information and the relative distance. A featured ground station.

(Appendix 9)
The ground station according to claim 6, wherein the distance measuring means comprises a radar device.

(Appendix 10)
The ground station according to appendix 6, wherein the distance measuring means comprises a radar device, and the radar device and the wireless communication device are integrally formed.

(Appendix 11)
The ground station according to any one of appendix 6 to appendix 10, wherein the ground station is installed in a station and uses information transmitted to and received from the train in the train radio communication system. A ground station that manages the station in arrival, departure, and passage.

It is a conceptual diagram which shows an example of a structure of the train radio | wireless communications system which is one embodiment of this invention. It is explanatory drawing which shows an example of the information stored in the memory apparatus with which the ground system which comprises the train radio | wireless communications system which is one embodiment of this invention is equipped. It is a conceptual diagram which shows the modification of the train radio | wireless communications system which is one embodiment of this invention. It is a conceptual diagram which shows the structural example of the train radio | wireless communications system which is another modification which is one embodiment of this invention. It is explanatory drawing which shows an example of the information stored in the memory apparatus with which the ground system which comprises the train radio | wireless communications system which is one embodiment of this invention is equipped. It is a conceptual diagram which shows the structural example at the time of applying the train radio | wireless communications system which is one embodiment of this invention to a station platform door fence opening / closing system. (A)-(d) is a diagram which shows the example of a measurement of the receiving state in each radio frequency. (A) And (b) is explanatory drawing which shows an example of the method of determining the use frequency in each distance from the measurement result of FIG. 7, and setting to a memory device. It is a flowchart which shows an example of operation | movement of the ground system which comprises the train radio | wireless communications system which is one embodiment of this invention. It is a flowchart which shows an example of operation | movement of the on-board system which comprises the train radio | wireless communications system which is one embodiment of this invention. (A) and (b) are a schematic side view and a schematic plan view showing a station platform door rail opening and closing system which is a reference technique of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Ground system 11 Control apparatus 12 Radar apparatus 12a Radar antenna 13 Radio transmission apparatus 13a Modulator 13b VCO
13c Transmitter 13d Local oscillation frequency signal 14 Wireless receiver 14a Receiver 14b VCO
14c Demodulator 14d Changeover switch 15 Circulator 16 Communication antenna 16a Transmission antenna 16b Reception antenna 16c Reception antenna 16d Reception antenna 17 Memory device 17a Relative distance 17b Frequency used CH
17c Train number 17d Transmission frequency 17e Reception frequency 17f Use receiving antenna 20 Train 21 Driver's cab device 30 On-board system 31 Controller 32 Radio transmitter 32a Modulator 32b VCO
32c transmitter 33 wireless receiver 33a receiver 33b VCO
33c Demodulator 34 Circulator 35 Communication antenna 35a Reception antenna 35b Transmission antenna 40 Direct wave 40a Radio carrier wave 41 Reflected wave 50 Station management system 51 Mobile station platform door fence controller 52 Drive motor 53 Station platform door 54 Safety fence 60 Station 61 Home 62 Rail 301-302 Ground element 301a-302a Cable 303 Information transmission device 304 Movable station platform fence control device 305 Train 306 Car upper member 307 Information transmission device 308 Driver's cab device 309 Rail

Claims (5)

A train radio communication system that performs radio communication between a ground station installed on the ground side and a mobile station mounted on the train side,
The ground station includes a wireless communication device capable of switching a communication frequency with the mobile station to an arbitrary frequency, distance measuring means for measuring a relative distance from a train, and communication at the relative distance for each communication frequency. A memory device for storing the situation, and a control means for switching the communication frequency with the mobile station based on the stored contents of the memory device and the relative distance actually measured by the distance measuring means. A train radio communication system.   2. The train radio communication system according to claim 1, wherein the memory device stores a transmission frequency and a reception frequency as the communication frequency, and the control unit does not generate the multipath fading according to the relative distance. A train radio communication system, wherein the radio communication is performed by selecting the transmission frequency and / or the reception frequency. The train radio communication system according to claim 1, wherein the mobile station has a function of transmitting installation position information indicating an installation position of the mobile station antenna in the train together with the identification information of the mobile station to the ground station. Prepared,
The memory device stores identification information of the mobile station, transmission frequency and reception frequency as the communication frequency, and the installation position information,
The control means performs the wireless communication by selecting the transmission frequency and / or reception frequency at which the multipath fading does not occur according to the installation position information corresponding to the identification information and the relative distance. A train radio communication system. A ground station that constitutes a train radio communication system that is installed on the ground side and performs radio communication with a mobile station mounted on the train side,
A wireless communication device capable of switching a communication frequency with the mobile station to an arbitrary frequency, distance measuring means for measuring a relative distance to the train, and a communication state at the relative distance for each communication frequency are stored. A ground unit comprising: a memory device; and a control unit that switches the communication frequency with the mobile station based on the stored contents of the memory device and the relative distance actually measured by the ranging unit. Bureau.   5. The ground station according to claim 4, wherein the memory device stores a transmission frequency and a reception frequency as the communication frequency, and the control means performs the transmission in which the multipath fading does not occur according to the relative distance. A ground station that performs radio communication by selecting a frequency and / or a reception frequency.