JPS6338759B2 - - Google Patents

Description

[Detailed Description of the Invention] A. Object of the Invention (a) Industrial Application Field The present invention relates to a communication device that exchanges information within a limited range between a mobile object and a ground station.

(b) Conventional technology In the conventional communication system between mobile body and ground station,
A method is known in which communications are sent and received through electromagnetic induction coupling between an antenna installed on the roof of a vehicle and a pole-mounted antenna on the road surface.
It is disclosed in Publication No. 11878 "Specified Vehicle Operation System".

(c) Problems to be solved by the invention In vehicle operation management and traffic control, vehicles that can run on free tracks on the ground, whether on public roads or private roads, are used at fixed points (e.g., parking lots, cargo handling areas, parking lots, etc.). etc.) It is important to know in which direction the vehicle was traveling.

Particularly in bus operation management, which requires strict implementation of the operation schedule (route and time), knowing the direction of travel of the buses that have actually passed is an extremely important management element. However, in the past, it was unclear which direction the bus was actually heading based only on passing point information, and it was only assumed that the bus was heading in the direction according to the schedule. This estimation does not pose much of a problem at general passing points, but when entering and exiting from a garage, there are cases where buses enter and leave for refueling or other purposes, and it is difficult to tell whether the bus is in the premises or not just from passing information. happens. According to the present invention, such problems are solved.

B. Structure of the Invention (a) Means for Solving the Problem Two or more roadside antennas are provided at fixed points on the vehicle's travel route, each with an antenna number assigned to them, and arranged in the direction of travel of the vehicle. A roadside antenna is connected to one roadside transceiver, and the plurality of roadside antennas are sequentially switched in a predetermined order to enable communication with a vehicle, and the roadside antenna that first communicates with a vehicle approaching a fixed point is This method is characterized by identifying the traveling direction of the vehicle based on the antenna number and arrangement, with the antenna installation direction as the approaching direction of the vehicle.

A specific example of the configuration of the present invention is shown in FIG.

In the figure, numeral 1 represents a moving object such as a bus or truck that is operated along a fixed route. Reference numeral 2 denotes an on-vehicle transceiver, which enters a transmitting state upon receiving a start signal (called a trigger signal) issued by the on-road transceiver 5, and sends signals such as its own vehicle number and destination to the on-road transceiver. 3 is the antenna of the on-board transceiver. 4
are pillars supporting the roadside antennas 6, 7 and 6', 7'. Reference numeral 5 denotes a roadside transmitter/receiver connected to the roadside antennas 6, 7 and 6', 7' by lines. Further, the on-road transceiver 5 switches the on-road antennas in a fixed order to transmit and receive weak inductive radio waves.

6, 7 and 6', 7' are on-road antennas that can be used for two round trips.
This is an example of the layout for lanes, and for one lane, 6,
It may be only 7. The road antennas are arranged so that the communication area of the weakly guided radio waves covers a predetermined road surface without overlapping each antenna. 8 is a communication line connecting the on-road transceiver and the central control device 9; 9 is a central control device that receives a signal from the on-road transceiver 5 and analyzes and processes the signal;
Reference numeral 10 denotes an output device from the central control device 9, such as a printer. Further, 11 is a communication line used for data supply with other control systems.

(b) Effect The effect of the present invention will be explained with reference to FIG. 1 following the previous section.

Communication between the on-road transceiver 5 and the on-vehicle transceiver 2 is performed as follows.

The roadside transceiver 5 constantly transmits a trigger signal while sequentially switching over four antennas: roadside antennas 6, 7 and 6', 7'. There are six possible switching patterns for the roadside antenna, including 6→7→6'→7', but any order is acceptable. The switching cycle is set to, for example, 50 times/second, taking into account vehicle speed, antenna spacing, etc. The distance traveled by the bus during one switching cycle is approximately 6 cm at a speed of 10 km/h.

On the other hand, when a vehicle approaches a fixed point along the route shown in the figure, it enters the communication area of the roadside antenna 6. When the on-board antenna 3 receives a trigger signal emitted from the roadside antenna and the signal reaches the on-board transceiver 2, communication is immediately established and the on-board transceiver transmits vehicle identification information that has been entered in advance, such as the vehicle number and destination. do. The roadside antenna 6 receives this signal and transmits it to the roadside transceiver 5. The on-road transceiver transmits signals such as the vehicle identification information, the communication antenna number, and other point information to the central control center through the communication line 8. The central control center has a central control unit 9 with a data processing function, which identifies from which direction a vehicle is approaching a fixed point based on vehicle identification information and the antenna number that first communicated with the vehicle, and determines the direction of travel of the vehicle. The results of identification and communication are recorded on the output device 10, and data from other control systems is supplied via the interconnection communication line 11.

C. Effect of the invention It goes without saying that identifying passing vehicles in communication systems between mobile and fixed stations, such as bus operation management, is extremely important for accurately transmitting control commands from the operation management data processing center. Conventional technologies for identifying vehicles require high equipment costs, such as underground radio and directional antennas, and there are many restrictions on installation locations and methods. In this regard, according to the method of the present invention, existing equipment such as general utility poles and sign posts on roadsides can be used, and the equipment can be changed by simply installing an arm several meters long on the pole and attaching two antennas. It can be implemented easily, and the above-mentioned constraints can be solved relatively easily.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a mobile/fixed station communication device according to the present invention. In the figure, 1... Bus, 2... On-vehicle transceiver, 3... On-vehicle antenna, 4... Pillar, 5... Road transceiver, 6, 6', 7, 7'... Road antenna, respectively. 8...Communication line, 9...Central control unit,
10...Output device, 11...Interconnection communication line.

Claims (1)

[Claims] 1. An on-board antenna and an on-board transmitter/receiver are mounted on a moving body such as a vehicle, and a roadside antenna and a roadside transmitter/receiver are installed at fixed points on the vehicle's travel route to act as fixed stations and exchange information, and The communication information is transmitted from the on-road transmitting/receiving device to a traffic management data processing center via a communication line to manage the operation of vehicles. The plurality of roadside antennas are connected to one roadside transmitter/receiver which is arranged along the traveling direction of the vehicle and can switch between the plurality of roadside antennas to receive and transmit signals, and communicate with the vehicle by sequentially switching the plurality of roadside antennas in a predetermined order. A mobile/fixed station communication device characterized by: 2. Two roadside antennas, each assigned an antenna number, are arranged in a limited range near a fixed point and along the direction of vehicle travel, and one roadside antenna can receive and transmit by switching between the two roadside antennas. Connected to a transmitter/receiver, the roadside antennas are alternately switched to communicate with the vehicle, and the communication information is transmitted to a traffic management data processing center through a communication line, and the traveling direction of the vehicle is identified from the first communication roadside antenna number and arrangement position. A communication device between a mobile body and a fixed station according to claim 1.