JP2007233458A - High-speed wireless measuring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-speed wireless measuring system which enables vehicles passing at high speed to receive data of sensors which are installed on the wall surface of a tunnel or in the vicinity of a road-side zone. <P>SOLUTION: The high-speed wireless measuring system is composed of; a plurality of sensors which are set to capture measured values, as linear voltages, in prescribed measurement ranges; a plurality of transmitters which transmit the output of the sensors as transmission data, are connected to antennas, and have embedded CPUs; and a receiver which receives radio waves transmitted from the transmitters. In this case, the transmitters collectively transmit their own IDs and the data which the CPUs receive from the plurality of sensors, and the output of the sensors is set so that the receivers may not capture the transmission data, as data, in intermediate points among the antennas connected to the plurality of transmitters. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a high-speed wireless communication system capable of receiving, for example, data transmitted wirelessly from different types of sensors installed along a specific track such as a tunnel or a road at a speed of 300 km / h.

  Conventionally, a contactless IC card or the like has avoided a problem by preventing a collision even if a plurality of tags enter the same area by using a congestion control function. For the congestion control function, the order of recognition is logically determined by using an algorithm prepared in the reading device, or a limited number of slots are assigned in a first-come-first-served manner by the pulse slot method.

  For example, in the identification wireless tag, when communicating with an LC resonance circuit composed of a coil and a capacitor, the identification wireless communication device in the configuration of the collision prevention means, the information storage means, and the control means for recognizing individual signals without interference from a plurality of signals Since the identification collision preventing means for identifying the signal is provided in the tag, the identification data stored in the information storage means can be transmitted to the identification wireless tag reader without causing interference, so that a large number of identification wireless tags that can be identified Techniques for forming are known. (Patent Document 1)

  Further, in order to prevent collision in communication between the reader / writer and the IC card, and to improve the efficiency and speed of communication, individual information and attributes of the IC card are displayed in the memory in order to identify the IC card. A technique is also known in which attribute information is stored, and the control unit uses the individual information and attribute information of the IC card stored in the memory as an identifier for the collision of communication. (Patent Document 2)

  Furthermore, for the purpose of easily confirming the environmental impact in the package distribution process and performing quality assurance, the central processing unit CPU, multiple sensors on the data carrier, A / D conversion means, memory means, real-time clock, infrared data Using a communication interface, the output from the plurality of sensors is converted into a digital signal by the A / D conversion means via a signal conditioner, and then data processing is performed by the CPU. A technique for reading out is also known. (Patent Document 3)

However, none of the above Patent Documents 1 to 3 disclose or suggest a technique for high-speed reading from a data carrier connected to a sensor (for example, 300 km / h).
JP 2001-134729 A Japanese Patent Laying-Open No. 2005-084926 JP 2000-302111 A

  The problem to be solved is that high-speed communication, for example, when a reading device is mounted on a vehicle that travels at a speed of 300 km / h or more like the Shinkansen and receives radio waves from a transmitting device provided in the tunnel. If the transmitting device emits radio waves necessary for high-speed reception, it takes time to control congestion, and it is difficult to reliably receive data from the transmitting device.

  In order to perform high-speed wireless communication of data measured by the sensor, the present invention transmits a plurality of sensors set so that measurement values can be taken out as linear voltages in a predetermined measurement range, and outputs the outputs of these sensors as transmission data. A high-speed wireless measurement system including a plurality of transmitters connected to an antenna and incorporating a CPU, and a receiver that receives transmission radio waves from the transmitter, wherein the transmitter includes its own ID data and the Transmitting the data acquired by the CPU from a plurality of sensors in a batch, and at the midpoint between the antennas connected to the plurality of transmitters, the receiver does not capture the transmission data as data. The output of the transmitter was set.

  The high-speed wireless measurement system of the present invention bundles data from a plurality of sensors with a transmitter in a place where a track such as a tunnel or a highway is fixed, and these bundle data together with ID data of the transmitter. By transmitting from two antennas, high-speed wireless communication can be ensured. For example, by installing a receiver on a Shinkansen traveling at 300 km / h or a highway inspection vehicle traveling at 150 km / h, maintenance data for tunnels and highways Collection and feedback to abnormal locations can be implemented in a short time.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings. In the following description, components having the same function are denoted by the same reference numerals, and repeated description thereof is omitted.

  FIG. 1 shows an installation example of data measurement in a tunnel such as a highway. An iron plate 2 and a probe 3 are attached to the tunnel inner wall 9 with a tunnel inner wall crack 10 in between. An eddy current is generated in the iron plate 2 by radio waves transmitted from the probe 3, and the eddy current is detected by the probe 3. 1, the distance between the iron plate 2 and the probe 3 is measured, cached as distance data in the transmitter 1, and wirelessly transmitted from the transmission antenna 4 in accordance with the transmission timing of the transmitter 1.

  The radio wave carrying the distance data is received by the receiver 7 from the receiving antenna 6 when the measuring instrument-equipped vehicle 5 passes through, and sent to the PC 8 as received data for data processing.

  FIG. 2 is a functional block diagram of the transmitter 1. Here, the eddy current generated in the iron plate 2 is detected by the probe 3, and the measurement data is sent to the transmission side CPU 11 via the connector 3a. In addition to the measurement data from the probe 3, the connector 3a has three terminals. By closing (grounding) or opening (opening) these three bit terminals, seven probes other than all three bits being opened ID is generated. By detecting the probe ID by the transmission side CPU 11, it is possible to linearly correct the output data level of the transmitter 1 using the probe profile previously installed in the transmission side CPU 11.

  As a result, not only the eddy current sensor but also different types of sensors, such as a temperature sensor, a humidity sensor, a water level sensor, etc. are connected to the transmission side CPU 11 so that necessary calibration (for example, zero point calibration, etc.) can be performed appropriately. Therefore, the receiver 7 side can perform high-speed processing without extra calculations. For example, by providing an alarm display on the transmitter 1 side, the reference value set in the transmission-side CPU 11 may be exceeded. When data is detected, it is possible to mark the transmitter 1 that has transmitted data exceeding the reference value by transmitting a signal for setting the alarm display.

  A memory 12 is connected to the transmission side CPU 11, and data from a plurality of probes 3 is temporarily stored, and when all the data is collected, the data is sent from the transmission side CPU 11 to the transmission RF circuit 13. By performing the batch transmission, the cycle time required for completing the data transmission from all the sensors is shorter than when the data from the individual probes 3 are transmitted alone.

  Here, in addition to the use as a cache memory, the memory 12 accumulates a plurality of data, and if processed by the transmission side CPU 11, for example, if it is a temperature, the average temperature or maximum / minimum every predetermined time (for example, 3 hours) It is also possible to transmit temperature and the like.

  In FIG. 2, the transmission RF circuit 13 and the antenna 4 are only shown one by one with solid lines, but as indicated by the dotted lines, a plurality of pairs of them are transmitted simultaneously at different frequencies, so that various radio wave environments can be obtained. Or, it becomes possible to correspond to the 5 speed of the vehicle equipped with the measuring instrument.

  In other words, even when the speed of the measuring instrument-equipped vehicle 5 exceeds 200 km and the reception error rate is high, if a plurality of carrier frequencies are used, the transmitter 1 has a pair of antennas matched to the plurality of carrier frequencies. By attaching the RF circuit, it is conceivable to transmit the same signal at a plurality of frequencies at the same time using frequency hopping. In this way, correct data can be extracted by collating a plurality of data received from a plurality of antennas that transmit simultaneously, so that data can be reliably received even if a vehicle equipped with a measuring instrument travels at a high speed of, for example, 300 km or more. It becomes like this.

  FIG. 3 is a functional block diagram of the receiver 7. The radio wave received by the antenna 6 is demodulated by the reception RF circuit 14, the signal is intermediately processed by the reception side CPU 15, and data processing and screen display are performed by the cable-connected PC 8.

  Although only one antenna 6 is shown in the solid line, the accuracy of reception can be improved by providing a plurality of antennas and the reception RF circuit 14 like the antenna 6 indicated by the dotted line.

That is, even when the speed of the measuring instrument-equipped vehicle 5 exceeds 200 km and the reception error rate becomes high, if a plurality of antennas are used, it is possible to receive radio waves emitted from the antenna 4 of the transmitter 1 multiple times. , The probability of receiving more increases. In addition, as described above, if frequency hopping using a plurality of carrier frequencies is used on the transmission side, the influence of nearby spurious and the like can be reduced, thereby further improving the accuracy of reception.

  In the above, the receiving side CPU 15 is only through the intermediate processing of the signal and the data contents are passed through. However, the receiving side memory 16 is temporarily stored in, for example, a flash memory, and then connected to the PC 8 later. A method of transmitting the data stored in the receiving side memory 16 to the PC 8 is also conceivable.

  Further, a certain amount (for example, 100 times) of information from sensors such as each probe 3 is accumulated in the transmission side memory 12, and the maximum value, minimum value, etc. therein are calculated by the transmission side CPU 11, and periodically. It is also conceivable that these data are transmitted to the receiver 7. This is because, for example, after collecting data by high-speed cruise, advanced data can be obtained by acquiring detailed data of a specific sensor such as the probe 3 in which an abnormality is observed.

  The above example assumes a highway tunnel, but this is the same for a railway tunnel, and is not limited to a tunnel, but a transmitter or sensor is installed on the roadside area of a highway or general road. Can use the same system.

  Further, in the above description, the receiver 7 received data from the transmitter 1 and analyzed the data by the receiving CPU 15. As a result, the abnormal part was specified. It is also conceivable that each transmitter 1 makes an abnormality determination by providing. In this case, the determination reference data may be set in advance in the transmission side CPU 11 or the transmission side memory 12 before the transmitter 1 is installed, or may be transmitted using the transmitter 1 after the installation.

  In addition, in the above, it is conceivable that the sensor is mounted not on the tunnel but on a cracked part of an apartment to perform periodic measurement. In this case, if an antenna with high directivity is used, it is easy to acquire measurement data of cracks at high positions, and even when measuring cracks on the veranda part of an apartment, a rotating means is provided. Measurements can be made by simply moving the antenna up and down from the top, and it is not necessary for the clerk to enter the apartment room, so it is possible to measure cracks without compromising the privacy of the residents.

  By laying the high-speed wireless measurement system of the present invention in a railway or highway tunnel or in a roadside belt, it is possible to regularly manage cracks, temperature and humidity in the tunnel, so that unforeseen accidents can occur. In railway tunnels, it is possible to safely operate high-speed trains using high-speed Shinkansen or linear motors, which contributes to the development of high-speed transportation systems.

Installation example of data measurement in highway tunnels Functional block diagram of transmitter Functional block diagram of the receiver

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Transmitter, 2 ... Iron plate, 3 ... Probe, 3a ... Connector, 4 ... Transmitting antenna, 5 ... Measuring instrument mounting vehicle, 6 ... Receiving antenna, 7 ... Receiver, 8 ... PC, 9 ... Tunnel wall surface, 10 ... Tunnel wall crack, 11 ... transmission side CPU, 12 ... transmission side memory, 13 ... transmission RF circuit, 14 ... reception RF circuit, 15 ... reception side CPU, 16 ... reception side memory.

Claims (2)

A plurality of sensors set so that measured values can be taken out as linear voltages in a predetermined measurement range, the outputs of these sensors are transmitted as transmission data, a plurality of transmitters connected to an antenna and incorporating a CPU, and this transmission A high-speed wireless measurement system configured with a receiver that receives radio waves transmitted from a machine, wherein the transmitter transmits its own ID data and data acquired by the CPU from the plurality of sensors in a batch; A high-speed wireless measurement system, wherein an output of the transmitter is set so that the receiver does not capture the transmission data as data at an antenna intermediate point connected to the plurality of transmitters. 2. The high-speed wireless measurement system according to claim 1, wherein the CPU of the transmitter has a discriminating unit for discriminating the type of sensor, and the firmware previously incorporated in the CPU built in the transmitter by the discriminating unit. The high-speed wireless measurement system is characterized in that calibration of data processing from the sensor is executed.