JPS62275874A - Moving-body position transducer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a mobile body position detecting device using radio waves, which is used to control a mobile body such as a train.

[Conventional technology]

FIG. 2 is a diagram showing a conventional mobile body position detecting device using radio waves disclosed in Japanese Patent Laid-Open No. 60-24470. In the figure, 1 is a moving object, 5 is a front antenna installed at the front of the moving object 1, and receives a radio signal transmitted by a radio wave f3 from a waveguide cable (leaky coaxial cable), 9
4 is a radio receiver that demodulates the radio signal received by the front antenna 5 and outputs a section identification signal specific to the waveguide cable; 4 is the section identification signal transmitted from the radio receiver 9 through the lead-in line 8; A wireless transmitter that transmits a modulated radio wave f2 (the frequency is different from the frequency of the radio wave f3), 6 is a mobile object 1
This is a rear antenna that is installed at the rear of the antenna and transmits radio waves r2 from the wireless transmitter 4 to the waveguide cable. The radio wave r2 is a radio wave for transmitting the section identification signal received by the front antenna 5 of the mobile object 1 to a radio receiver on the ground, and the radio wave r3 is a radio wave for transmitting the section identification signal to the front antenna 5 through a waveguide cable. . 12.13.14 is a waveguide cable that is divided and installed in the moving direction of the moving body 1 corresponding to each closed section of the trajectory on which the moving body 1 moves; 22.32.42
is connected to the waveguide cable 12.13.14, and the moving body 1
f2 demodulates the section identification signal transmitted from the radio wave [2]
70 is an interface circuit for inputting the section identification signal output from the radio receiver 22.32.42 to the logic circuit 51; 72.73.74 is the section identification signal output from the interface circuit 70; Signal lines 82, 83, and 84 that transmit the data to the logic circuit 51 are section identification signal devices 23.33 that output section identification signals a, b, and c corresponding to the waveguide cables 12, 13, and 14, respectively.
．． 43 is a radio transmitter that transmits radio waves f3 modulated with section identification signals a, b, and c, respectively; 60 is radio waves f2 and f
This is a duplexer that separates 3.

Next, the operation of this conventional device will be explained.

Assume that the moving object 1 is now on the waveguide cable 13. The waveguide cable 13 to which the front antenna 5 of the moving body 1 is connected receives the section identification signal from the section identification signal device 83, and the radio wave f3 modulated by the radio transmitter 33 is transmitted via the splitter 60. Power is being supplied.

The front antenna 5 of the moving body 1 receives this radio wave f3 and inputs it to the radio receiver 9, which demodulates it and transmits it to the radio transmitter 4, which receives this radio wave f3. The radio wave f2 modulated with the identification signal is transmitted to the waveguide cable 13 coupled to the rear antenna 6. The radio wave f2 input to the waveguide cable 13 is inputted to the radio reception [32] via the splitter 60, demodulates the section identification signal of the waveguide cable 13 from the section identification signal device 83, and sends it to the interface circuit. 7
0 to the logic circuit 51 through the signal line 73. The logic circuit 51 detects the input section identification signal S and the signal '1a73 into which the signal S is introduced, and detects the front position of the moving body 1 by the former and the rear position of the moving body 1 by the latter, The respective position information is stored and held in correspondence with the waveguide cable 13 sections. Next, when the moving body 1 moves and the front antenna 5 enters the section of the adjacent waveguide cable 14 and the rear antenna 6 reaches a position where it remains in the section of the waveguide cable 13,
The signal line 73 that introduces the section identification signal into the logic circuit 51 remains the same, but the section identification signal input to the logic circuit 51 is not the section identification signal of the waveguide cable 13, but is replaced by the section identification signal generator 84. A section identification signal C of the waveguide cable 14 is input from the waveguide cable 14. The logic circuit 51 thereby stores and holds the front position information of the moving body 1 in correspondence with the section of the waveguide cable 14, and at the same time stores the front position information of the moving body 1 corresponding to the previously stored section of the waveguide cable 13. A moving body 1 corresponding to an adjacent waveguide cable 14 in the moving direction of the moving body
The front position information is deleted on the condition that it has been stored. When the moving body 1 moves further and both its front antenna 5 and rear antenna 6 enter the section of the waveguide cable 14,
The logic circuit 51 stores and holds the rear position information of the moving object 1 in correspondence with the section of the waveguide cable 14, and at the same time stores the rear position information of the moving object 1 corresponding to the section of the waveguide cable 3 previously stored. Adjacent waveguide cable 1 in the moving direction of the moving object
It is deleted on the condition that the rear position information of the mobile object 1 corresponding to section 4 has been stored.

[Problem that the invention seeks to solve]

In this type of device, the radio wave f3 is modulated with a section identification signal corresponding to each section of the waveguide cable, but the switching of the terrestrial radio transmitter that controls this modulation is difficult if these are of a constant transmission type. There is a risk that mutual interference may occur at the boundary point of the R-wave cable section, and these radio transmitters may
Even in the case of a transmission switching method in which the wireless transmitter of the previous waveguide cable section is switched to the wireless transmitter of the next waveguide cable section on the condition that the section identification signal of the previous waveguide cable is not received, the switching is extremely difficult. There was a problem in that the system was unstable and could malfunction due to momentary interruptions in radio waves.

This invention was made in order to solve the above-mentioned conventional problems, and is a method for transmitting section identification signals on the ground without causing malfunctions at the boundaries of waveguide cable sections.
It is an object of the present invention to provide a moving object position detecting device that can reliably switch between IIIA machines and has improved reliability compared to conventional devices.

[Means to solve the problem]

In order to achieve the above object, the present invention uses a radio device at the front of the moving body that receives radio waves from the ground as a radio transmitter/receiver, and connects a signal generator to the radio transmitter/receiver. The radio device that transmits the identification signal is used as a radio transceiver, and both radio transceivers are controlled to alternately switch between transmission and reception, and when the radio transceiver on the ground side receives the front signal output from the signal generator, The wireless transmitter/receiver starts alternating transmission/reception switching control, and the other wireless transmitter/receiver on the ground side, which was performing alternate transmission/reception operation, is fixed to the receiving mode.

[Effect]

A radio device mounted on the front of a mobile body is a transceiver that alternately transmits and receives signals to and from the ground, and a radio device is installed on the ground to receive radio signals transmitted from the transceiver to the ground. If the mobile object enters a new waveguide cable section, the transmission controller switches the terrestrial radio device when the radio device starts receiving the radio signal transmitted to the ground. , Earthless! a. The device can reliably switch from the radio in the previous waveguide cable section to the radio in the new waveguide cable section without malfunction.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the present invention. In the figure, fl is a radio wave that alternately transmits a section identification signal specific to the waveguide cable section from the ground to the mobile body 1 and a signal from the mobile body 1 to the ground. 2 is a signal generator,
A front signal (modulated signal) is sent to a wireless transceiver 7 installed at the front of the moving body 1. Reference numeral 3 denotes a transmission controller, which controls intermittent transmission to alternately switch the transmission and reception operations of the wireless transceiver 7. The radio transmitter/receiver 7 demodulates the radio signal received by the front antenna 5 and sends out a section identification signal, and also sends the radio wave f modulated to the frequency of the front signal to the front antenna 5.
Sends 1. Reference numerals 24, 34, and 44 are radio transceivers of the ground equipment, which have the function of transmitting radio waves f1 modulated with section identification signals a, b, and c to a waveguide cable, and the radio transceiver 7 transmits them through the waveguide cable. It has the function of receiving the above-mentioned front signal through a waveguide cable.

25. 35 and 45 are transmission controllers, respectively.
It controls intermittent transmission control and transmission switching control (described later) that alternately switches the transmission and reception operations of the wireless transceivers 24, 34, and 44. Since the other configurations are the same as those in FIG. 2, the same reference numerals are given and the explanation thereof will be omitted.

Next, the operation of this device will be explained.

Assume that the moving object 1 is now on the waveguide cable 13. The waveguide cable 13 to which the front antenna 5 of the mobile body 1 is connected is supplied with a section identification signal from the section identification signal device 83 and a radio wave f1 modulated by the wireless transmission/reception a34 via the duplexer 60. has been done. The front antenna 5 of the mobile object 1 receives this radio wave 1 and inputs it to the radio transmitter/receiver 7. A transmission mode in which a signal is transmitted to the ground is alternately repeated.A transmission controller 3 is provided to control this intermittent transmission, and the wireless transceiver 7, for example, if the transmission mode is continued for one second, the next one is transmitted. On the other hand, the radio transceiver 7 on the ground is also controlled by the transmission controller 35 so that if the radio transceiver 34 continues to be in the receiving mode for one second, it will be in the transmitting mode for the next second. The transmission is controlled synchronously with and in the opposite mode, and the transmission is performed while always checking the radio wave f1 from the mobile object 1.
Intermittent transmission is controlled to prevent interruptions. The transmission controller 35 not only has this intermittent transmission control function, but also has a switching function (described later) for the terrestrial wireless transceivers 24, 34, and 44.
It also has The radio transceiver 7 on the mobile body 1 that received the radio wave r1 demodulates it and transmits it to the radio transmitter 4, and the radio transmitter 4 modulates the radio wave f2 with this zone identification signal and sends it to the rear aerial cotton 6. It is transmitted to the coupled waveguide cable 13. The radio wave r2 inputted to the waveguide cable 13 is sent to the branching filter 6.
0 to the radio receiver 32, demodulates the section identification signal of the waveguide cable 13 from the section identification signal device 83, and inputs it from the interface circuit 70 to the logic circuit 51 through the signal line 73. The logic circuit 51 detects the input section identification signal and the signal line 73 into which the signal is introduced, and uses the former to detect the front position of the moving body 1 and the latter to detect the rear position of the moving body 1. The position information corresponding to the waveguide cable section 13 is stored and held. Next, when the moving object l moves and the front antenna 5 enters the section of the adjacent waveguide cable 14 and the rear antenna 6 reaches a position where it remains in the section of the waveguide cable 13, the wireless The transceiver 44 comes to receive the radio wave f1 modulated by the output of the signal generator 2 from the mobile object 1 to the ground.

Under the condition of this reception, the transmission controller 45 sends a command to the transmission controller 35 to stop the transmission of the wireless transceiver 34 in the previous cable section (the section of the waveguide cable 13) and fix it in the reception mode. At the same time, the wireless transmitter/receiver 44 is enabled to transmit, and the wireless transmitter 44 is subjected to the above-mentioned intermittent transmission control.The signal line 73 that inputs the section identification signal to the logic circuit 51 remains the same. The identification signal input to the logic circuit 51 is erased by the section identification signal C of the waveguide cable 13, and in its place, the section identification signal C of the waveguide cable 14 from the section identification signal device 84 is input.Logic circuit 51 As a result, the front position information of the moving object 1 is stored and retained in correspondence with the section of the waveguide cable 14, and at the same time, the front position information of the moving object 1 corresponding to the section of the waveguide cable 13 stored last time is stored as the moving object progresses. Directional adjacent waveguide cable 14
The information is deleted on the condition that the front position information of the moving body 1 corresponding to is stored. When the moving object 1 moves further and its front antenna 5 and rear antenna 6 enter the section of the waveguide cable 14, the logic circuit 51 corresponds the rear position information of the moving object 1 to the section of the waveguide cable 14. At the same time, the rear position information of the movable body 1 corresponding to the section of the waveguide cable 13 previously stored is changed to the rear position information of the movable body 1 corresponding to the section of the adjacent waveguide cable 14 in the moving direction of the movable body. will be deleted on the condition that it has been memorized.

In this way, in this embodiment, the radio transceiver 24 on the ground side
．． 34 and 44, when the front part of the moving body 1 is on the waveguide cable to which each of them is connected, the front part signal from the moving body 1 is intermittently received, so the mobile body 1 When the front part of the mobile body 1 moves and enters a new waveguide cable section, the radio transmitter/receiver of the new waveguide cable section receives the front part signal. Entering the wave cable section is detected. On the condition that this detection has occurred, in this embodiment, the wireless transceiver of the previous waveguide cable section through which the front part of the moving object 1 passed is stopped, and at the same time, the wireless transceiver of the new waveguide cable section is activated. Therefore, the wireless transceivers corresponding to adjacent waveguide cables can be automatically switched without causing mutual interference of radio waves at the boundary between waveguide cable sections.

〔Effect of the invention〕

As explained above, this invention uses a wireless device mounted on the front of a mobile body as a transmitter/receiver, and transmits and receives signals to and from the ground alternately, and receives radio signals transmitted from the transmitter/receiver to the ground. When a mobile device is installed on the ground and the radio device on the ground begins to receive radio signals transmitted to the ground, the terrestrial radio device is switched. When entering a section, it is possible to reliably switch the terrestrial radio device from the non-YA device in the previous waveguide cable section to the radio device in the new waveguide cable section without malfunction, improving the reliability of position detection compared to conventional methods. can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional moving body position detection device. In the figure, 1--mobile body, 2-signal generator, 3-transmission controller, 4--radio transmitter, 5.6-- antenna,
12-14 - Leaky coaxial cable, 7.24.34.44
---Radio transceiver, 25.35.45--Transmission controller, 51-Logic circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In a mobile object position detection device that detects the position of a mobile object moving on a track divided into multiple closed sections, it includes antennas installed at the front and rear, a signal generator that sends a front signal, and a front antenna. a radio transceiver that demodulates the signal received through the front antenna and transmits a radio wave modulated by the front signal through the front antenna; a transmission controller that alternately controls the transmission and reception mode of the radio transceiver; a mobile body equipped with a radio transmitter that modulates radio waves of a different frequency from the received radio waves and transmits them from the rear antenna;
Waveguide cables are laid separately in the direction of movement of the mobile object corresponding to each of the closed sections, and section identification is provided corresponding to each waveguide cable and sends a section identification signal unique to each waveguide cable. a signal device, a radio transceiver that transmits the section identification signal to a corresponding waveguide cable and receives radio waves transmitted from the front antenna through the waveguide cable, and alternately controls the transmission/reception mode of the radio transceiver. Ground equipment having a transmission controller, and section identification means that inputs a signal from the rear antenna received by the waveguide cable and identifies a blocked section in which the mobile object is located;
On the condition that the radio transceiver of the above-mentioned ground equipment receives the above-mentioned front signal, it starts an alternate transmission/reception operation, and at the same time, the other radio transceivers on the ground side that were performing the alternating transmission/reception operation are fixed to reception mode. Characteristic mobile object position detection device.