JPS6022835A - Transmitter of information for mobile body - Google Patents

Abstract

PURPOSE:To eliminate the interference of a radio wave near the boundary of LCXes (leakage coaxial cables) and to reduce the radio frequency used for position detection by selecting a sole LCX section and transmitting a radio wave from the said LCX section only. CONSTITUTION:When a mobile body 101 moves to the vicinity of the boundary between the LCXes 12 and 13, while the mobile body 101 exists in the detecting section of a position detector 52, a radio wave is transmitted from the LCX12 only through the operation of a logical circuit 61, and when the mobile body 101 enters the detecting section of a position detector 53, the position detector 53 detects the mobile body 101 and inputs its information to the logical circuit 61. Thus, the logical circuit 61 controls a radio output control circuit 42 to stop feeding an output of a ground radio set 22 to the LCX12 and controls simultaneously a radio output control circuit 43 to feed an output of a ground radio set 23. Thus, an on-vehicle antenna 3 receives a radio wave from a sole LCX only and has only to use one radio frequency only for position detection.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mobile information transmission device that transmits information such as ATC to a moving body such as a train using a leaky coaxial cable (hereinafter referred to as LCX).

A conventional device of this type is shown in FIG. In the figure, 101 is a moving object such as a train, ■ is a front radio transceiver, 2 is a front information transmission device, 3 is a front on-board antenna,
4 is a rear radio transmitter/receiver, 5 is a rear information transmission device, 6 is a rear on-board antenna, ■1.12, 13.14 are LCXs installed along the track corresponding to the blocked sections, respectively, 21,
22゜23.24 is a terrestrial radio transceiver that uses the corresponding LCXs 11 to 14 as antennas, 31, 32, 33゜34 corresponds to each LCX section, and is an on-board information transmission device 2 of a mobile object existing in each section. A ground information transmission device 60 sends and receives information to and from 5, and 60 grasps the positions of the moving objects in each section, which is necessary for controlling the moving objects, and specifies the speed of the moving objects based on the relative positions of the moving objects. It is a logic circuit that

Next, the operation will be explained. Assume that the moving object 101 is now traveling at the position shown in FIG. The mobile body 101 outputs a mobile body front signal from its front information transmission device W2 and a mobile body rear signal from its rear information transmission device 5, and outputs a radio frequency signal from its front radio transceiver 1 and rear radio transceiver 4, respectively. , the front on-board antenna 3 and the rear on-board antenna 6
The above signals are transmitted from time to time.

These radio waves are transmitted to the terrestrial radio transceiver 22.23 via the LCXs 12 and 13 corresponding to the blocked section, and are subjected to ifim at the terrestrial radio transceiver 22.23.
2.33 to the logic circuit 60. Although the logic circuit 60 illustrated only the blocked sections 12, 13, and 14 where the moving object 101, that is, the train, exists based on the input information,
The logic circuit 60 also grasps the position information of other moving objects necessary for controlling the moving object 101, and controls the ground information transmission equipment 31, 32, 33, and 34 to locate the closed section where each moving object exists. transmits a permitted speed signal corresponding to the position of the vehicle. The terrestrial radio transceivers 21, 22, 23, and 24 are constantly transmitting radio waves, convert these permitted speed signals into radio frequencies, and transmit them to the corresponding LCXll, 12, 13, and 14.

Then, the mobile object 101 receives the radio waves from the LCX in the blocked section where it is located using the front onboard antenna 3, demodulates them using the front wireless transceiver 1, and transmits the upper limit signal of the allowable speed from the front information transmission device 2. The traveling speed of the moving body 101 is controlled by inputting it to an operation control device (not shown) of the moving body 101.

Such conventional devices are useful for transmitting location information of moving objects to ground equipment, and transmitting control information from ground equipment to moving objects on railways where lightning track circuits cannot be used due to noise, etc. However, since it is a method in which high-quality radio waves are transmitted from each LCX divided into each blocked section, the radio waves emitted from adjacent LCXs at the boundary of the LCX cause mutual interference, causing interference from ground equipment. This has the disadvantage that it may interfere with information transmission to moving objects. In addition, in order to identify the position of a moving object by continuously transmitting the moving object front signal fl and the moving object rear signal f2, the radio frequency used is two waves ( fl, [2), had the disadvantage that it required one wave (F), a total of three waves, to transmit mobile control information from the ground.

This invention was made to eliminate the drawbacks of the conventional ones as described above, and is the only LC that does not detect the position of a moving object with a position detector and send out transmission information to the moving object.
By selecting the X section and transmitting radio waves only from the relevant LCX section and not transmitting radio waves from other LCX sections, radio wave interference near the LC and It is an object of the present invention to provide a mobile information transmission device that can smoothly transmit information to and reduce the number of radio frequencies used for position detection.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, 101 is a mobile object, 1 is a front radio transceiver, 2 is a front information transmission device, 3 is a front on-vehicle antenna, and 5 is a front radio transmitter/receiver.
1, 52, 53, and 54 are mobile body position detectors provided corresponding to each closed section and detecting the position of the mobile body 101;
1, 12, 13, and 14 are LCXs connected to the front on-vehicle antenna 3 of the mobile object 101, which are divided corresponding to each closed section, and at the boundaries thereof, adjacent LCXs partially overlap. It is installed along the track. 21, 22
．． 23 and 24 are terrestrial radio transceivers using the corresponding Lcxil-14 as antennas, 31, 32, 33.34 are each L
Ground information transmission equipment corresponding to the CX section and transmitting and receiving information with the on-board information transmission equipment 2 of mobile objects existing in each section; A radio output control circuit 61 controls the transmission output of 24, and 61 grasps the position of the moving objects in each section, which is necessary for controlling the moving objects, and uses the relative positions of the moving objects to control the ground information transmission devices 31 to 34. The terrestrial radio transceiver 2 is transmitted only to the LCX connected to the on-vehicle antenna 3 of the mobile object 101.
Each wireless output control circuit 4 is configured to feed outputs 1 to 24.
This is a logic circuit that controls 1 to 44. This logic circuit 61
and the wireless output control circuits 41 to 44 constitute a wireless output control means.

Next, the operation will be explained.

When the moving object 101 enters the detection section of the position detector 52 corresponding to the closed section, the position detector 52 detects that the moving object 101 is present in the section, and inputs the detection result to the logic circuit 61. The logic circuit 61 selects the terrestrial radio device 22 that should transmit radio waves to the movable object 101 based on the position information of the movable object 101, and controls the radio output control circuit 42 that controls the output of the radio device 22 to transmit the radio wave to the terrestrial radio device 101. The output of the machine 22 is fed to the LCX 12 in the section. At this time, other terrestrial radio devices do not transmit radio waves due to the operation of their respective radio output control circuits.

On the other hand, since the ground information transmission device 32 transmits the permitted speed signal corresponding to the section 52 under the control of the logic circuit 61, the front radio transceiver 1 of the mobile object 101 transmits the radio wave F on which the permitted speed signal is superimposed. The signal is received, demodulated, input to the front information transmission device 2, and a permitted speed signal is output to a control device (not shown) of the moving body 101, thereby controlling the running speed of the moving body 101.

Next, when the moving body 101 moves close to the boundary between the LCXs 12 and 13, the LCX
When the moving object 101 enters the detection zone of the position detector 53, the position detector 53 detects the moving object 101 and inputs the information to the logic circuit 61.

When the mobile object presence information from the position detector 53 is input, the logic circuit 61 controls the radio output control circuit 42 to stop feeding the output of the terrestrial radio 22 to the LCXI 2,
At the same time, the wireless output control circuit 43 is controlled to feed the output of the terrestrial wireless device 23 to the LCX 13.

Here, at the LCX boundary point, adjacent LCXs are laid partially overlapping, but by appropriately selecting the boundaries of the detection sections of the position detectors 51 to 54, the front on-vehicle antenna of the moving object 101 can be installed. 3 receives radio waves only from the only LCX even near the boundary between adjacent LCXs, and can smoothly receive transmission information from the ground information transmission devices 31 to 34.

Furthermore, in the above embodiment, since the position of the moving body 101 is detected by the position detectors 51 to 54, only one radio frequency is required for position detection, which reduces the radio frequency used compared to the conventional method. can do.

In addition, in the above embodiment, A is sent from the ground equipment to the moving object.
Although the case of transmitting TC information has been described, the same effects as in the above embodiment can be obtained for transmitting other analog and digital information such as voice and data.

Also, conversely, audio is transmitted from a mobile object to ground equipment.

The same effects as in the above embodiments can also be achieved for the transmission of analog and digital information such as data.

As described above, according to the present invention, a part of the adjacent CX is laid overlappingly to eliminate a receiving station for a moving object at the LCX boundary point, and a moving object detector is provided, and the boundary of the detection section is By appropriately selecting
In all the sections that a moving object travels, only the LCXI section will always transmit radio waves to the moving object.
To be able to eliminate radio wave interference due to radio wave reception from multiple LCXs, to always obtain a good receiving electric field even at LCX boundary points, and to perform information transmission to a mobile object using LCXs satisfactorily over the entire range mentioned above. It has the effect of Furthermore, since a moving object detector is provided to detect a moving object, it is possible to reduce the number of radio frequencies used for position detection.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a mobile information transmission apparatus that transmits mobile control information using a conventional LCX, and FIG. 2 is a block diagram of a mobile information transmission apparatus according to an embodiment of the present invention. 101... Mobile object, 11-14... Leaky coaxial cable, 21-24... Terrestrial radio transceiver, 51-54.
. . . Mobile body position detector, 41 to 44 . . . Wireless output control circuit (wireless output control means), 61 . . . logic circuit (wireless output control means). In the drawings, the same reference numerals indicate the same or equivalent parts. Agent Masuo Oiwa Figure 1 Figure 2 Procedure amendment (voluntary) 1. Indication of the case: Japanese Patent Application No. 58-132270 2, Name of the invention: Mobile body 1n information transmission device N 3, Person making the amendment Representative Kata Yuhito Department 4, Agent 5, Detailed description of the invention in the specification to be amended Explanation column 6, details of correction. (2) In the 4th line of page 9, "1/J!i is sufficient," is corrected to "It is no longer needed."I"2

Claims (1)

[Claims] (1) A leaky coaxial cable that corresponds to each blockage section and is laid separately in the moving direction of the moving object so that adjacent parts partially overlap at the boundary points, and a U" is installed for each of the leaky coaxial cables." (ii) a terrestrial radio transceiver that transmits and receives information to and from the mobile body; a mobile body position detector that detects the closed section in which the mobile body is located; 1 to send a signal to a mobile object
1. A mobile information transmission device comprising: wireless output control means for selecting one of two leaky coaxial cables and controlling the output of the terrestrial wireless transceiver so as to transmit radio waves only from the leaky coaxial cable.