JP2001270440A - Train detection apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a train detection apparatus for detecting the approach of a train with high accuracy. SOLUTION: A spectrum diffused electric wave is emitted from a train detection apparatus body 1 and the train is detected from the distance to an object 6 and the level of reception from the object 6, depending on the reflected wave. A reflector 2 is installed and the operation of the apparatus is always checked on the basis of reflections from the reflector.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a train detection device that measures the distance and speed to a train and detects that the train has approached.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 5-254432, for example, a train detecting device using a track circuit has a block section formed by dividing rails (tracks) into predetermined lengths. Is a part of the track circuit, and a transmitter for transmitting a signal of a predetermined frequency is connected to the start end of the block section (the side from which the train enters), and the end side of the block section (the train enters). Receiver) for receiving signals.

[0003] In the above configuration, when a train is present in the block section and the rail is short-circuited by the axle (wheel) of the train, the output level of the receiver decreases, while no train exists in the block section. At times, the output of the receiver is maintained at a predetermined height. Therefore, the orbit relay is turned on at the output of the receiver.
If N and OFF are set, the presence or absence of a train in the block section can be detected in the ON and OFF states.

The block section is electrically insulated from an adjacent block section by an impedance bond or the like with respect to an AC signal so as not to interfere with a train detection signal in the adjacent block section. It is devised. Also,
If the AC signal is formed so as to be electrically non-insulated, interference is prevented by making the frequencies of the detection signals used in adjacent block sections different from each other.

[0005]

However, in the above-described conventional train detection device using a track circuit, the rails forming a part of the track circuit have an S / N ratio that is low due to an environment susceptible to noise. Easy, and change the carrier frequency to eliminate mutual interference with adjacent tracks.
There is a disadvantage in that the circuit configuration becomes complicated because a resonance circuit is provided at the orbit boundary. Further, the maintenance vehicle has a disadvantage that it cannot be detected by the track circuit system because the axle is insulated.

A train detection device according to the present invention has been made in order to solve the above-mentioned problems, and uses a radio wave.
Less affected by external noise and weather (rain, fog, snow, etc.)
An object of the present invention is to provide a train detection device capable of reliably detecting a vehicle including a maintenance vehicle by improving the detection accuracy of the train within the detection range.

[0007]

A train detecting apparatus according to the present invention comprises: a transmitting / receiving unit having a transmitting antenna for emitting a radio wave and a receiving antenna for receiving a reflected wave of the radio wave from an object existing within a measurement range; In the train detection device including a signal processing unit that calculates a distance and a speed from the reflected wave received by the receiving antenna to the object and a logic processing unit that determines whether the object is a train, A reflector is provided at a desired position within the range and reflects the radio wave emitted from the transmitting antenna, and the reflected wave from the reflector is received by the receiving antenna, whereby the radio wave is transmitted from the transmitting antenna. This is to confirm that it was fired.

[0008] Further, a code-modulated radio wave is emitted from the transmission antenna, a radio wave received by the reception antenna is demodulated to extract a modulation code, and the extracted modulation code and the radio wave emitted from the transmission antenna are extracted. By comparing with a modulation code, it is possible to determine whether or not a radio wave received by the receiving antenna is a reflected wave of a radio wave emitted from the transmitting antenna.

The logic processing unit determines whether the object is a train based on the distance to the object calculated by the signal processing unit.

The logic processing section determines whether or not the object is a train based on the reception level of the reflected wave from the object.

When a plurality of lines are adjacent to each other,
A reflector is installed between any adjacent lines of the plurality of lines, and the distance to the object calculated by the signal processing unit and the distance to the reflector are compared, and the object is It is possible to determine on which of a plurality of tracks the vehicle is located.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a configuration diagram of the train detection device according to the first embodiment. In this figure, reference numeral 1 denotes a train detection device main body, each of which has a logic processing unit 1a for judging a train approaching based on distance and speed data to a measured object, and 1b from a reflected wave from the object to an object. A signal processing unit for calculating the distance and the speed of the signal, and the signal processing unit 1b includes an SS modulation / demodulation unit for performing spread spectrum (SS) modulation / demodulation. Reference numeral 1c denotes a transmitting antenna for emitting a modulated radio wave, 1d denotes a receiving antenna for receiving a reflected wave from an object, 1e denotes a transmitting / receiving unit composed of them, and 1f denotes an LED lamp for display. Reference numeral 2 denotes a reflector that reflects radio waves, and is installed at a desired position.

FIG. 2 shows an example of installation of a train detection device. In this figure, 1 is a train detection device main body, 2 is a reflector, 3 is a transmission device for transmitting approach information to another device, 4
Is a guidance control device of another device, 5 is a railroad crossing control device, and 6 is an object such as a train to be measured.

The operation will be described with reference to FIGS. In the SS modulator / demodulator, a spread spectrum modulated radio wave is emitted from the transmitting antenna 4 to the outside by a PN code generated by a PN (pseudo noise) code generator, and the emitted radio wave hits the object 6 and its reflected wave is returned. Come. The reflected wave is received by the receiving antenna 5 and demodulated (despread) by the SS modulator / demodulator. At this time, the distance and the speed to the object 6 can be obtained in the signal processing unit by taking the autocorrelation.

In FIG. 2, when the reflector 2 does not exist, only the reflected wave of the object 6 returns. However, when the object 6 does not exist, no reflection returns. 4 cannot be distinguished from a state in which radio waves are not emitted. In order to solve this problem, the reflector 2 is installed, and even when the object 6 does not exist, the self-check is always performed by a closed loop of transmission-reflector reflection-reception so as to receive the reflected wave of the reflector 2.

Even if a radio wave other than the radio wave emitted by itself is received, this apparatus performs code modulation by the PN code, and therefore, the radio wave modulated by a code other than the code modulated by itself (other than the code modulation). Modulation by the modulation method or non-modulation is excluded during demodulation (during despreading), and non-reflection is treated the same as. This makes it possible to distinguish between a case where the object 6 does not exist and a state where no radio wave is emitted due to a failure of the transmission antenna 4 or the like.

The reflector 2 is installed at the boundary between the up line and the down line. As a result, the position (distance) relationship between the detection range and the object not to be detected becomes clearer than the inside of the reflector installation position, and it is possible to reliably determine whether the train is an up-train or a down-train.

FIG. 3 is a diagram showing a measurement range and a train detection range in the train detection device. The signal processing unit calculates the distance and the speed to the object within the next measurement distance, and outputs them to the logic processing unit. The measurement distance (horizontal direction) is 0 m from the transmitting antenna 1c and the receiving antenna 1d to the reflector installation position. The reflector is located 40 m ± 1 m from the transmitting antenna 1c and the receiving antenna 1d. In FIG. 3, a hatched portion is a detection range in which the logic processing unit in the entire measurement range determines that the object is a train. This detection range is 20 m to 40 m ± 1 m. The measurement distance (vertical direction) is in the range of 0.8 m to 3 m above the ground. The reflector 2 is mounted at a height of 0.9 m above the ground surface, and the transmitting antenna 1c and the receiving antenna 1d are mounted at a height of 2.5 m above the ground surface.

Here, in this train detection device, as a self-diagnosis, the position of the reflector 2 installed at the boundary of the measurement range is constantly measured to check the soundness. Then, the monitoring information is constantly transmitted to the logic processing unit at a constant period. still,
If there is no object within the measurement range, the reflected wave of the reflector is measured.If there is a train (at the time of detection), the reflected wave from the train is measured. Measure the reflected wave from a small object.

FIG. 4 shows the relationship between the reception level and the distance.
FIG. 5 shows the lighting range of the LED lamp. The operation of setting the detection distance of the logical processing unit 1a and detecting the train will be described below with reference to FIGS.

The logic processing section (CPU section) 1a adjusts the position of the reflector 2 so that the level of the reflector 2 becomes maximum. Then, if the level is at the threshold level of the train detection, the LED lamp "setting" blinks. Above the threshold,
As the reflector standard reception level is approached, the blinking interval is shortened to facilitate setting. If the installation distance (40 m) of the reflector 2 matches the standard reception level, the LED lamp "setting" is turned on. The reflector installation location is determined based on the “set” distance. “Setting” is the reflector 2
Blinks and lights with only reflection level.

The logic processing section (CPU section) 1a detects the presence or absence of a train and detects the direction based on the distance and speed data from the signal processing section 1b to the object as a train detection function. The detection distance is 20 m from the transmitting antenna 1c and the receiving antenna 1d to the reflector installation position. The position where the reflector is installed is 40 m ± 1 m from the transmitting antenna 1c and the receiving antenna 1d.

In the logic processing unit (CPU unit) 1a, measurement data outside the detection distance of 40 m or more from the transmitting antenna 1c and the receiving antenna 1d far from the reflector 2
Shall be ignored. In addition, a train to be detected and an animal, a car, a person, and the like not to be detected are determined based on a difference in reception level. When it is within the detection distance and is equal to or more than the threshold value, it is determined that the train is detected, and the detection relay is dropped. Based on the speed of the object, it is determined whether the object is approaching or moving away. If it is within the detection distance and is approaching, the approach relay is dropped. If so, drop the remote relay. At the time of detection, the LED lamp “detection” is turned on. When approach is detected, “approach” is lit. When far away is detected, “far” is lit. In addition, "detection""approach"
The lamp at the time of “far” is turned on according to the reception level of the reflected wave from the detection target, and excludes the reflected wave from the reflector 2.

Here, an object in the detection exclusion range is not determined as a train detection, but is used for a soundness check in the sensor unit. In addition, the reflection of the reflector is higher than the threshold value, but is used not for the detection range but for the soundness check.
Also, Lmi is transmitted from the transmitting antenna 1c and the receiving antenna 1d.
n. In the detection exclusion range of the distance range of ２０20 m, the reception level is used for the soundness check. 0 to Lmin. The short-range unstable measurement distance range up to (the accuracy of the distance does not matter) is the failure determination range.

The relationship between the reception level and the distance in FIG. 4 will be further described below. FIG. 6 shows a case without a train.
In this case, only the reflected wave from the reflector 2 is received.
This is the state of regular health check when there is no train. FIG. 7 shows a case where there is a train within the detection distance of 20 to 40 m. In this case, it is determined that the train is detected when the reception level is equal to or higher than the threshold. FIG. 8 shows a case where an object (for example, a human) other than a train exists within a detection distance of 20 to 40 m in the track. In this case, it is not determined that the train is detected because the reception level is less than the threshold value, but the reflected wave from the reflector 2 is used for the soundness check. FIG. 9 illustrates a case where an object (for example, a human) other than a train exists at a distance shorter than 20 m. In this case, although the detection is not determined from the detection exclusion range, the reflected wave from the person is used for the soundness check instead of the reflected wave from the reflector 2.

[0026]

According to the present invention, there is provided a train detecting apparatus comprising: a transmitting / receiving unit having a transmitting antenna for emitting a radio wave, a receiving antenna for receiving a reflected wave of the radio wave from an object existing within a measurement range, and a receiving antenna for receiving the signal. A signal processing unit for calculating a distance and a speed from the reflected wave to the object and a logic processing unit for determining whether the object is a train; Is provided at a position and reflects a radio wave emitted from the transmitting antenna, and by receiving a reflected wave from the reflector by the receiving antenna, the radio wave is emitted from the transmitting antenna. , The influence of external noise and weather is small, the accuracy of train detection within the measurement range is improved, and the train can be reliably detected.

Further, a code-modulated radio wave is emitted from the transmission antenna, a radio wave received by the reception antenna is demodulated to extract a modulation code, and the extracted modulation code and the radio wave emitted from the transmission antenna are extracted. By comparing with a modulation code, it is possible to determine whether or not the radio wave received by the receiving antenna is a reflected wave of the radio wave emitted from the transmitting antenna, so that the radio wave other than the radio wave emitted from the transmitting antenna can be determined. , The radio wave can be excluded, and therefore, it can be surely confirmed that the radio wave is emitted from the transmission antenna, so that the train can be detected more reliably.

Further, the logic processing section determines whether or not the object is a train based on the distance to the object calculated by the signal processing section, so that the train can be detected more reliably.

Further, the logic processing section determines whether or not the object is a train based on the reception level of the reflected wave from the object, so that the train can be detected more reliably.

When a plurality of lines are adjacent to each other,
A reflector is installed between any adjacent lines of the plurality of lines, and the distance to the object calculated by the signal processing unit and the distance to the reflector are compared, and the object is Since it is possible to determine on which of the plurality of tracks the train is located, the train can be detected more reliably.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a train detection device according to a first embodiment.

FIG. 2 is an installation example of the train detection device according to the first embodiment.

FIG. 3 is a diagram illustrating a measurement range of the train detection device according to the first embodiment.

FIG. 4 is a diagram illustrating a reception level of the train detection device according to the first embodiment.

FIG. 5 is a diagram showing a lighting range of the LED lamp according to the first embodiment.

FIG. 6 is a diagram illustrating a reception level of the train detection device according to the first embodiment when there is no train;

FIG. 7 is a diagram illustrating a reception level of the train detection device according to the first embodiment when there is a train;

FIG. 8 is a diagram illustrating a reception level of the train detection device according to the first embodiment when there is a human;

FIG. 9 is a diagram illustrating a reception level of the train detection device according to the first embodiment when a human is present at a short distance.

[Description of Signs] 1 Train detection device main body, 1a Logical processing device, 1b
Signal processing unit, 1c transmitting antenna, 1d receiving antenna, 1e transmitting / receiving unit, 1f LED lamp, 2
Reflector, 3 transmission device, 4 guidance control device, 5
Railroad crossing control device, 6 objects.

Continued on the front page F term (reference) 5H161 AA01 BB02 BB06 BB09 CC13 DD21 MM02 MM14 NN11 5J070 AB07 AC02 AC06 AE03 AF01 AK22

Claims (5)

[Claims] A transmitting / receiving unit having a transmitting antenna for emitting a radio wave and a receiving antenna for receiving a reflected wave of the radio wave from an object existing within a measurement range; In a train detection device including a signal processing unit that calculates a distance and a speed, and a logic processing unit that determines whether the object is a train, a signal processing unit that is installed at a desired position in the measurement range and transmits from the transmission antenna Equipped with a reflector that reflects the emitted radio waves, and
A train detection device configured to receive a reflected wave from the reflector by the reception antenna to confirm that a radio wave has been emitted from the transmission antenna. 2. A code-modulated radio wave is emitted from a transmission antenna, a radio wave received by a reception antenna is demodulated to extract a modulation code, and the extracted modulation code and a radio wave emitted from the transmission antenna are extracted. The train detection device according to claim 1, wherein a comparison is made with a modulation code to determine whether or not the radio wave received by the reception antenna is a reflected wave of a radio wave emitted from the transmission antenna. 3. The train detection device according to claim 1, wherein the logic processing unit determines whether the object is a train based on the distance to the object calculated by the signal processing unit. 4. The train detection device according to claim 1, wherein the logic processing unit determines whether the object is a train based on a reception level of a reflected wave from the object. 5. When a plurality of lines are adjacent to each other, a reflector is installed between any of the plurality of adjacent lines, and a distance to an object calculated by a signal processing unit and the reflection are determined. The train detection device according to claim 1, wherein it is possible to determine on which of the plurality of tracks the object is located by comparing the distance to a vessel.