CN105644585A - Length measurement device and method for hump marshalling station - Google Patents

Abstract

The invention discloses a length measurement device for a hump marshalling station. The length measurement device comprises a multi-frequency signal source. The output end of the multi-frequency signal source is connected to a power amplifying circuit. The output end of the power amplifying circuit is connected to an isolation transformer. The length measurement device further comprises a digital phase discriminator which is connected with an isolation filter. The first input end of the isolation filter is connected with the first output end of the isolation transformer. The first output end of the isolation transformer serves as the first output end of the length measurement device. The second input end of the isolation filter serves as the second output end of the length measurement device. The second output end of the isolation transformer is grounded. The length measurement device further comprises a central DSP which is connected with an interface of an upper computer. The first output end of the length measurement device is connected to one end of one track in a length measurement track circuit, and the second output end of the length measurement device is connected to the other corresponding end of the other track in the length measurement track circuit.

Description

Long Apparatus and method for surveyed by a kind of hump marshalling station

Technical field

The invention belongs to railway signal technology field, survey long Apparatus and method for particularly to a kind of hump marshalling station.

Background technology

Hump is surveyed long equipment and is used to measure the vacant measurement of length device of each bar shunting line in railway classification yard. It is one of fundamental equipments of hump control system, the vacant length of shunting line is the important evidence selecting release speed at retarder, occurring inaccurate if surveying long equipment, may result in over-speed coupling or the phenomenon put in a skylight, affect disintegration efficiency, security incident even occurs.

At present, the length measurement system of domestic and international marshaling yard application, no matter it is that power frequency is surveyed long or audio frequency survey is long, their principle is all the impedance measuring long track circuit, this impedance changes along with surveying standing vehicle position difference on long track circuit, thus extrapolating the length surveying long track circuit, the track clear length that namely we need.

The core of this measurement scheme is the functional relationship surveying long track circuit impedance with idle length, and existing way is to arrange one or several functional relationships according to typical case, then carries out matching primitives. There is a problem in that the parameter surveying long track circuit is a time-varying system, such as electric capacity between ballast aggregate bleeder resistance between two rail, rail, not only relevant with the self-condition of circuit (insulating properties etc. of ballast aggregate composition, sleeper classification and unit length quantity, concrete pillow fastener), relevant with vehicle and the situation that contacts of rail (light car, loaded vehicle, rail level get rusty unclean etc.), and along with the impact of the external factor such as weather (humidity, temperature, railway roadbed pollution condition) changes greatly. The change of track circuit parameter makes the impedance of survey long track circuit change, and necessarily causes the error that length measurement system is measured. This is the inherent shortcoming of this metering system, it is impossible to solve. Added up the actually used situation of certain establishment field, same actual idle track length, the idle length of measurement is measured when being rain when becoming a fine day one times, very big difficulty was caused for field operation.

Summary of the invention

It is an object of the invention to provide a kind of hump marshalling station and survey long Apparatus and method for, to solve the prior art inaccurate problem of measurement.

The technical scheme is that, long equipment surveyed by a kind of hump marshalling station, and including multiple-frequency signal source, the outfan in this multiple-frequency signal source accesses power amplifier, and the outfan of power amplifier accesses isolating transformer,

The long equipment of described survey also includes digital phase discriminator, this digital phase discriminator connects separation filter, the first input end of described separation filter is connected with the first outfan of described isolating transformer, and the first outfan of described isolating transformer is as the first outfan of the long equipment of described survey

Second input of described separation filter as the second outfan of the long equipment of described survey,

Second output head grounding of described isolating transformer,

The long equipment of described survey also includes central authorities and processes DSP, and these central authorities process DSP and are connected with host computer interface,

First outfan of the long equipment of described survey accesses surveys one end of a track in long track circuit, and the second outfan of the long equipment of described survey accesses surveys the corresponding other end of another root track in long track circuit.

Rectangular method surveyed by a kind of hump marshalling station, adopts following methods:

One signal generator is set, every an interval T1, exports the signal of telecommunication comprising multi-frequency, this signal of telecommunication is delivered to one end of track circuit, also enters into the first input end of a latency measurement circuit simultaneously;

The other end of track circuit accesses the second input of described latency measurement circuit;

Described latency measurement circuit obtains time delay �� t,

According to based on the signal of telecommunication in the functional relationship of time delay �� t and track clear length L surveying long track circuit:

�� t=L/V (1)

Wherein, �� t is propagation delay time, and L is track clear length, and V is the electromagnetic wave transmission speed at track circuit,

C is the light velocity,

�� is the relative dielectric constant of material, relevant with the material of rail, can be obtained by system calibrating,

The track clear length L surveying long track is obtained according to formula (1).

Rectangular method surveyed by a kind of hump marshalling station, adopts the described long equipment of survey, comprises the following steps:

Multiple-frequency signal source, every an interval T1, exports the signal of telecommunication comprising multi-frequency, this signal of telecommunication is delivered to one end of track circuit, also enters into the first input end of separation filter simultaneously;

The other end of track circuit accesses the second input of described separation filter;

Separation filter and digital phase discriminator composition latency measurement circuit,

Described latency measurement circuit obtains time delay �� t,

According to based on the signal of telecommunication in the functional relationship of time delay �� t and track clear length L surveying long track circuit:

�� t=L/V (1)

Wherein, �� t is propagation delay time, and L is track clear length, and V is the electromagnetic wave transmission speed at track circuit,

C is the light velocity,

�� is the relative dielectric constant of material, relevant with the material of rail, can be obtained by system calibrating,

The track clear length L surveying long track is obtained according to formula (1).

Being compared with the prior art, advantages of the present invention has:

A) certainty of measurement is high, and measurement error is less than 1 meter, far above the error criterion of existing equipment 10 meters.

B) measurement result good stability, not by the impact of the environmental factorss such as season, weather, vehicle, track.

C) measurement result real-time is good, and the result once accurately measured just can draw at Millisecond. And existing equipment needs repetitive measurement result is compared and computing just can be obtained a result, it is generally required within 10 seconds, just there is a reliable result.

D) traveling speed of coupling vehicle can be measured.Owing to can measure idle length in real time, thus can measuring the speed of coupling vehicle, this is that the long equipment of existing survey is irrealizable. Current marshalling yard uses Doppler radar to measure this data, if this equipment is reached the standard grade, Doppler radar avoids the need for.

E) energy consumption is low. Existing measurement device is that big electric current is transported to track current always, and power consumption is very big, and a station track needs more than 1 kilowatt. This equipment uses batch (-type) to measure, simply the energy consumption of watt level.

Accompanying drawing explanation

Fig. 1 is that the present invention surveys long equipment theory of constitution schematic diagram.

Detailed description of the invention

As shown in Figure 1, long equipment surveyed by the hump marshalling station of the present invention, including multiple-frequency signal source, the outfan in this multiple-frequency signal source accesses power amplifier, the outfan of power amplifier accesses isolating transformer, the long equipment of described survey also includes digital phase discriminator, this digital phase discriminator connects separation filter, the first input end of described separation filter is connected with the first outfan of described isolating transformer, first outfan of described isolating transformer is as the first outfan of the long equipment of described survey, second input of described separation filter is as the second outfan of the long equipment of described survey, second output head grounding of described isolating transformer, the long equipment of described survey also includes central authorities and processes DSP, these central authorities process DSP and are connected with host computer interface, first outfan of the long equipment of described survey accesses surveys one end of a track in long track circuit, second outfan of the long equipment of described survey accesses surveys the corresponding other end of another root track in long track circuit.

Arranging length meter in the establishment station equipment room of the present invention or outdoor equipment case, two holding wires of length meter access the head surveying long track circuit with plug pin. Inside length meter, processed DSP formed by multiple-frequency signal source, power amplifier, isolating transformer, separation filter, digital phase discriminator, central authorities.

Based on the signal of telecommunication functional relationship in time delay and the idle length of surveying long track circuit:

�� t=L/V

Wherein:

�� t is propagation delay time,

L is idle length,

V is the electromagnetic wave transmission speed at track circuit,C is the light velocity, and �� is the relative dielectric constant of material.

Owing to the relative dielectric constant of rail is relevant with the material of rail, would not change once rail has laid, can demarcate in Practical Project. As can be seen from the above equation, as long as we can measure �� t just can extrapolate idle length.

Concrete technical scheme is to arrange a signal generator, at regular intervals, one signal of telecommunication comprising multi-frequency of interrupted output, this signal is delivered to one end of track circuit, also enters into an input of latency measurement circuit simultaneously; The another one input of the other end access delay measuring circuit of track circuit.

The signal of every kind of frequency is regarded as the measurement of measurement, is referred to as " survey chi ". Modulation frequency is more big, and certainty of measurement is more high. Owing to surveying the cycle repeatability of chi signal, use one to survey chi and can not realize the accurate measurement of length. Thus use one group (two or more) to survey chi and measure three together, can ensure precision and the scope measured to obtain accurate measurements simultaneously. Latency measurement circuit is by measuring the phase contrast of every kind of frequency signal of two inputs, it is possible to calculate accurate time delay.

The demarcation of system is when track clear, determines that the position of length is by track circuit short circuit, measures the time delay in this situation, thus extrapolating the relative dielectric constant of material at certain.

Idle track length can be calculated by proven relative dielectric constant and time delay.

Claims (3)

1. long equipment surveyed by a hump marshalling station, it is characterised in that includes multiple-frequency signal source, and the outfan in this multiple-frequency signal source accesses power amplifier, and the outfan of power amplifier accesses isolating transformer,

The long equipment of described survey also includes digital phase discriminator, this digital phase discriminator connects separation filter, the first input end of described separation filter is connected with the first outfan of described isolating transformer, and the first outfan of described isolating transformer is as the first outfan of the long equipment of described survey

Second input of described separation filter as the second outfan of the long equipment of described survey,

Second output head grounding of described isolating transformer,

The long equipment of described survey also includes central authorities and processes DSP, and these central authorities process DSP and are connected with host computer interface,

First outfan of the long equipment of described survey accesses surveys one end of a track in long track circuit, and the second outfan of the long equipment of described survey accesses surveys the corresponding other end of another root track in long track circuit.

2. rectangular method surveyed by a hump marshalling station, it is characterised in that adopt following methods:

One signal generator is set, every an interval T1, exports the signal of telecommunication comprising multi-frequency, this signal of telecommunication is delivered to one end of track circuit, also enters into the first input end of a latency measurement circuit simultaneously;

The other end of track circuit accesses the second input of described latency measurement circuit;

Described latency measurement circuit obtains time delay �� t,

According to based on the signal of telecommunication in the functional relationship of time delay �� t and track clear length L surveying long track circuit:

�� t=L/V (1)

Wherein, �� t is propagation delay time, and L is track clear length, and V is the electromagnetic wave transmission speed at track circuit,

$V=C/\sqrt{\mathrm{\ϵ}},$ C is the light velocity,

�� is the relative dielectric constant of material, relevant with the material of rail, can be obtained by system calibrating,

The track clear length L surveying long track is obtained according to formula (1).

3. rectangular method surveyed by a hump marshalling station, it is characterised in that adopts the long equipment of survey as claimed in claim 1, comprises the following steps:

Multiple-frequency signal source, every an interval T1, exports the signal of telecommunication comprising multi-frequency, this signal of telecommunication is delivered to one end of track circuit, also enters into the first input end of separation filter simultaneously;

The other end of track circuit accesses the second input of described separation filter;

Separation filter and digital phase discriminator composition latency measurement circuit,

Described latency measurement circuit obtains time delay �� t,

According to based on the signal of telecommunication in the functional relationship of time delay �� t and track clear length L surveying long track circuit:

�� t=L/V (1)

Wherein, �� t is propagation delay time, and L is track clear length, and V is the electromagnetic wave transmission speed at track circuit,

$V=C/\sqrt{\mathrm{\ϵ}},$ C is the light velocity,

�� is the relative dielectric constant of material, relevant with the material of rail, can be obtained by system calibrating,

The track clear length L surveying long track is obtained according to formula (1).