JP3118067B2 - Train position detection device - Google Patents

Train position detection device

Info

Publication number
JP3118067B2
JP3118067B2 JP8970792A JP8970792A JP3118067B2 JP 3118067 B2 JP3118067 B2 JP 3118067B2 JP 8970792 A JP8970792 A JP 8970792A JP 8970792 A JP8970792 A JP 8970792A JP 3118067 B2 JP3118067 B2 JP 3118067B2
Authority
JP
Japan
Prior art keywords
signal
code
train
circuit
block
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP8970792A
Other languages
Japanese (ja)
Other versions
JPH05254432A (en
Inventor
健二 中田
章二 入江
淳 菅原
Original Assignee
日本信号株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本信号株式会社 filed Critical 日本信号株式会社
Priority to JP8970792A priority Critical patent/JP3118067B2/en
Publication of JPH05254432A publication Critical patent/JPH05254432A/en
Application granted granted Critical
Publication of JP3118067B2 publication Critical patent/JP3118067B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a train position detecting device, and more particularly to a device using a track circuit.

[0002]

2. Description of the Related Art Conventionally, a train position detecting device using a track circuit has a block of a track section formed by dividing a rail (track) for each predetermined length as a part of a track circuit, and the block section of the block. A transmitter for transmitting a signal of a predetermined frequency is connected to the starting end of the train (the side on which the train enters), and a receiver for receiving the signal is connected to the end side of the block section (the side on which the train enters). It is configured.

[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 that time, the output of the receiver is maintained at a predetermined height. Therefore, if the track relay is turned on and off by the output of the receiver, the presence or absence of the train in the block section can be detected in the on / off state.

[0004] The above-mentioned 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 low because the environment is 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.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a train position detecting apparatus according to the present invention comprises a signal spreading means for spreading a predetermined transmission signal with a PN code, and a signal spreading means for spreading the signal by the signal spreading means. Sending means for sending the spread signal to the starting end of the rail forming the track circuit, receiving means for receiving the spread signal from the end of the rail, and transmitting the spread signal received by the receiving means to the predetermined position. Extracting means for demodulating and using the transmission signal to extract the PN code; detecting a matching state between the extracted signal extracted by the extracting means and the PN code; And detecting means for detecting the presence of

[0007]

In the above arrangement, the spread signal spread by the signal spreading means is supplied to the starting end of the rail forming the track circuit by the sending means. When there is no train on the rail, the reception signal received from the end of the rail is demodulated using the transmission signal to extract the PN code used by the signal spreading means. Next, the PN code extracted by the detecting means and the PN code used by the signal spreading means are used.
When the code matches, the presence of a train is detected. On the other hand, when a train is present on the rail, the reception level of the receiving means is low, and thus the PN code is not extracted by the extracting means. For this reason, the detecting means detects the presence of a train on the condition that there is no PN code matching state.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a train position detecting device according to one embodiment, in which a track (corresponding to a rail of the present invention, sometimes referred to as a rail hereinafter) T is a block section at predetermined intervals (FIG. In FIG. 1, in order to simplify the drawing, the block T
Only three block sections centered on i are shown. ) T
i , Ti-1 and Ti + 1 .

Each block section T i , T i-1 , T i + 1 may be a section using a known impedance bond, or may be a non-insulated section in which a capacitor or the like is interposed between rails.

[0010] The example apparatus, since it is placed in each block section, will be described below train position detection device corresponding to the block section T i.

[0011] The block section T i start end side of the rail T of the (train a the block section T advance to the side from i) Lee, the termination side (the side train a enters the block section T i) Russia and the equipment room b Is electrically connected to

A transmission / reception facility is installed in the equipment room b so that the position of the train a in the block section T i can be detected.

First, as the transmission equipment, the signal generator 1,
A spreading circuit 2 and a transmitter 3 are provided. The signal generator 1 outputs a carrier wave (corresponding to a transmission signal of the present invention) (f ci ) obtained by modulating a non-modulated or predetermined transmission signal into a normal AM, FM, or the like by a modulation circuit. Is configured.

The spreading circuit 2 has a predetermined PN code (PN
i ′i ″ )) from the PN code generator 4
After spreading the carrier (f ci ) using the N code, it is configured to output to the next transmitter 3.

The transmitter 3 is formed of a known amplifier, and is configured to supply its output to the starting end A of the rail T.

Next, as the receiving equipment, a receiver 5, a demodulation circuit 6, a filter circuit 7, and a detection circuit 8 are provided. This receiver 5 is formed by a well-known amplifier circuit.
The output signal is configured to be output to the demodulation circuit 6.

The demodulation circuit 6 is configured to perform a division process using the carrier (f ci ) transmitted from the signal generator 1 to the spreading circuit 2.

The filter circuit 7 is formed of a well-known low-pass filter, and is configured to filter the output from the demodulation circuit 6 and output the processed signal to the detection circuit 8.

The detection circuit 8 is formed of a well-known correlation matched filter circuit, and receives the PN signal from the PN code generator 4.
A code (PN i ′i ″ )) is input, and a matching state with the PN code (PN i ′i ″ )) from the filter circuit 7 is detected. It is configured to drive the TR.

Since the detection circuit 8, the spreading circuit 2, the PN code generator 4 and the signal generator 1 are installed in the same equipment room b and connected by wire, the synchronization process can be performed very easily. it can. Therefore, there is no need to provide any complicated synchronizing circuit or the like as in ordinary spread spectrum communication in which transmission / reception facilities are isolated.

In the apparatus of this embodiment having the above configuration, the block T
Of course, the present invention can be applied even when i is electrically insulated from an AC signal by an impedance bond or the like.
However, in the case of the non-insulated type having no such insulation equipment, the frequency of the carrier (f ci ) and the PN code are used in order to prevent interference between adjacent block sections T i + 1 and T i-1. , And one of the phases of the PN code, or two of them, and all of them are different from those used in the adjacent block sections T i + 1 and T i-1 .

The frequency of the carrier wave (f ci ) is made different from the adjacent block sections T i-1 and T i + 1 , which is the same as that of the conventional train position detecting device using the track circuit.
Differentiating the type of code or the phase of the PN code is a feature that can be provided by the configuration of the present invention.

[0023] Here, to differentiate the type of PN code, for example, when using one PN code of the m-sequence code in block section T i is the block section T i-1 to the right, The PN code is to use another code of the m series having the same code length. In order to make the phase of the PN code different, as shown in FIG.
When the same PN code or different types of PN codes are used for i , T i-1 , and T i + 1 , for example, they are different from the adjacent block sections T i-1 and T i + 1 by Δθ. It is.

In the apparatus of this embodiment, the carrier wave (f ci )
Is different from the adjacent block sections T i−1 , T i + 1, and the PN code is set to each block section T i , T i + 1.
Different PN codes PN i ′ are used for i−1 and T i + 1 and the phases are shifted from each other by Δθ. Therefore, transmission and reception can be performed without interference between adjacent block sections. In order to simplify the apparatus, one or two of the carrier (f ci ), the PN code (PN i ′ ), and the phase of the PN code (θ i ″ ) can be changed. Even in this case, mutual interference with adjacent orbits can be reduced to a certain extent.

Next, the detection operation of the apparatus of this embodiment will be described. First, a description will be given of a case where the block section T i no trains a.

The carrier (f ci ) transmitted from the signal generator 1 is subjected to a PN code (PN i ′i ″ )) by the spreading circuit 2.
The signal is spread by using the signal A, and the spread signal is supplied to the starting end A of the rail T via the transmitter 3.

At the terminal end b of the rail T, there is a spread signal including a carrier with attenuation due to the length of the rail T. The spread signal is amplified by the receiver 5 and then demodulated by the demodulation circuit 6 using the carrier (f ci ) to extract the spread signal (PN i ′ ). Then, the original PN code (PN i ′ ) is extracted.

Thereafter, the detector 8 lifts the track relay TR when the PN code (PN i ' ) is present at the output of the filter circuit 7. At this time, for example, even if noise due to the commercial power supply harmonics or noise transmitted from a train running on another track adjacent to the track T exists in the block section T i , the output of the filter circuit 7 is not changed. PN code (P
When N i ′ ) is included, the detection output can be obtained ignoring the noise, so that the train position detection with extremely high noise resistance can be performed.

On the other hand, when the train a exists in the block section T i , the rail T is short-circuited by the axle of the train a, so that the level of the spread signal on the terminal side B is small, and the output level of the receiver 5 is also small. . Therefore, the detector 8 cannot maintain the lifting of the track relay TR and falls. Train a by falling of the track relay TR is able to know that that existed block section T i. Of course, even when the train a is detected, the output of the detector 8 is a PN code (PN
Since the matching state of i ′ ) is observed, noise is effectively removed.

In the above-described embodiment, the carrier wave, the type of the PN code, and the phase of the PN code are all different from the adjacent block sections, but one or two of them are different. Similarly, it is possible to detect the train position with high noise resistance and without mutual interference with the adjacent track circuit.

[0031]

The train position detecting device according to the present invention comprises: a signal spreading means for spreading a predetermined transmission signal with a PN code;
Sending means for sending the spread signal spread by the signal spreading means to the starting end of the rail forming the track circuit; receiving means for receiving the spread signal from the end side of the rail; and receiving means for receiving the spread signal. Extracting means for demodulating the spread signal using the predetermined transmission signal to extract the PN code; and extracting the PN code with the extracted signal extracted by the extracting means.
A train position detecting device having excellent noise resistance can be provided because it comprises a detecting means for detecting a sign matching state and detecting the presence of a train on the rail based on the presence or absence of the matching state. In particular, the matching state of the PN codes, that is, the correlation, can be more distinguished from noise by increasing the code length, and a large noise resistance can be obtained. Therefore, the noise resistance can be further improved as compared with the method of extracting the transmission signal by the despreading process, and the train position detecting device having no mutual interference with the adjacent track circuit can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a phase difference of a PN code.

[Explanation of symbols]

 Reference Signs List 1 signal generator 2 spreading circuit (spreading means) 3 transmitter (sending means) 4 PN code generator 5 receiver 6 demodulation circuit (extraction means) 8 detection circuit (detection means)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-211162 (JP, A) JP-A-59-1458 (JP, A) JP-A-60-4340 (JP, A) (58) Field (Int.Cl. 7 , DB name) B61L 1/00-29/32

Claims (1)

(57) [Claims]
1. A signal spreading means for spreading a predetermined transmission signal with a PN code, a sending means for sending a spread signal spread by the signal spreading means to a starting end of a rail forming a track circuit, and the rail Receiving means for receiving the spread signal from the terminal side of the receiving means; extracting means for demodulating the spread signal received by the receiving means using the predetermined transmission signal to extract the PN code; Detecting means for detecting a state of coincidence between the extracted signal extracted in step (a) and the PN code, and detecting the presence of a train on the rail based on the presence or absence of the state of coincidence.
JP8970792A 1992-03-13 1992-03-13 Train position detection device Expired - Fee Related JP3118067B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8970792A JP3118067B2 (en) 1992-03-13 1992-03-13 Train position detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8970792A JP3118067B2 (en) 1992-03-13 1992-03-13 Train position detection device

Publications (2)

Publication Number Publication Date
JPH05254432A JPH05254432A (en) 1993-10-05
JP3118067B2 true JP3118067B2 (en) 2000-12-18

Family

ID=13978254

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8970792A Expired - Fee Related JP3118067B2 (en) 1992-03-13 1992-03-13 Train position detection device

Country Status (1)

Country Link
JP (1) JP3118067B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101667634B1 (en) * 2012-01-19 2016-10-19 엘에스산전 주식회사 Track circuit apparatus for train

Also Published As

Publication number Publication date
JPH05254432A (en) 1993-10-05

Similar Documents

Publication Publication Date Title
CA2091785C (en) Synchronous spread spectrum communications system and method
CA1246709A (en) Receiver apparatus for three-phase power line carrier communications
CA1278060C (en) Spread spectrum power line communications
US6215437B1 (en) Procedure for reading the data stored in a transponder and a transponder system for the execution of the procedure
EP0074848A2 (en) Method and apparatus for data transmission using chirped frequency-shift-keying modulation
US6795490B2 (en) Signal detection in a direct-sequence spread spectrum transmission system
JP4125956B2 (en) Data transmission method and apparatus for at least one energy supply line
KR940000703B1 (en) Satellite receiver
US4926440A (en) Spread-spectrum communication apparatus
DK165091B (en) Procedure and connection to synchronizing the receiver equipment in a digital multiple power transmission system
US4457019A (en) System for separately receiving multiple station audio-tour signals
JPH02207630A (en) Spread spectrum communication equipment
JPH07123232B2 (en) Synchronous tracking device for spread spectrum communication
GB2190255A (en) Electrical filter
JPH05103024A (en) Automatic gain control method
EP0084400B1 (en) Detection system
JP2661534B2 (en) Spread spectrum receiving method and receiver
JP5461589B2 (en) Delay detection circuit and receiver
US4475208A (en) Wired spread spectrum data communication system
US6246729B1 (en) Method and apparatus for decoding a phase encoded data signal
EP0360476A3 (en) Homodyne-type spread spectrum transmitter/receiver
CA2141654A1 (en) Data Demodulation Circuit and Method for Spread Spectrum Communication
EP0887990A3 (en) Modem unit
KR960003192A (en) Synchronous transmission and reception device of spread spectrum communication method
CZ294978B6 (en) Method of transmitting and receiving data, system and receiver therefor

Legal Events

Date Code Title Description
FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20071006

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20081006

Year of fee payment: 8

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20081006

Year of fee payment: 8

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20091006

Year of fee payment: 9

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20101006

Year of fee payment: 10

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20111006

Year of fee payment: 11

LAPS Cancellation because of no payment of annual fees