CN106276533A - The method and apparatus controlling light curtain - Google Patents

Abstract

The present invention relates to a kind of method and apparatus controlling light curtain, the method includes: obtain the distance between transmitting terminal and receiving terminal；If described distance is less than the distance threshold preset, opens the launch point of more than two group of number simultaneously and receive point；Gather the signal of telecommunication receiving some reception launch point transmitting signal that described receiving terminal is opened；Judge that the signal intensity of the signal of telecommunication of described collection, whether less than corresponding signal of telecommunication threshold value, if at least the signal intensity of a signal of telecommunication is less than corresponding signal of telecommunication threshold value, then judges that described light curtain is blocked respectively；The present invention is less than, when the transmitting terminal of elevator light curtain and the distance of receiving terminal, the distance threshold preset, and opens the launch point of more than two group of number simultaneously and receives point, and in the case of the number of combinations of launch point and reception point is certain, the total scanning time of light curtain reduces.

Description

Method and device for controlling light curtain

Technical Field

The present invention relates to the field of light curtain control, and more particularly, to a method and apparatus for controlling a light curtain.

Background

The light curtain is composed of a transmitting end and a receiving end. The transmitting end is provided with a plurality of transmitting points, the receiving end is provided with a plurality of photosensitive devices (hereinafter referred to as receiving points), and light emitted from the transmitting points is received by the receiving points of the receiving end and then converted into electric signals. The light curtain opens the transmitting end and the receiving end one by one according to a certain sequence (each combination is a pair of transmitting and receiving points), if the receiving end can receive the light signal of the transmitting end under each combination, the light curtain is considered to be not blocked, and if the receiving end does not receive the light signal of the transmitting end under some combinations, the light curtain is considered to be blocked. Since only one pair of combinations can be turned on at a time, the scan period is: the total scan time (single-point scan time + scan interval time) is the number of combinations. With the development of light curtain products, in order to reduce the dead zone of the light curtain (i.e. the minimum diameter of the transmitting point and the receiving point is not shielded), the number of the transmitting points and the number of the receiving points are more and more, so that the number of the combinations is more and more, the total scanning time (scanning period) is longer and longer, and the scanning speed of the light curtain is reduced.

Generally, when the elevator is closed, the light curtain is shielded, and a shielding signal of the light curtain is sent to a main controller (hereinafter referred to as main control) of the elevator, the main control commands a door controller (hereinafter referred to as door machine) to stop closing the door and reversely open the door. When the scanning time of the light curtain is prolonged, the time from the light curtain being shielded to the door stop of the door machine is also prolonged, which results in the prolonged distance of the door operation during the process from the light curtain being shielded to the door stop being closed. This may degrade the user experience while increasing the risk of the door hitting a passenger.

Disclosure of Invention

Based on this, a method and apparatus for controlling a light curtain are provided to overcome the problem of long total scanning time of the light curtain.

A method of controlling a light curtain, comprising: acquiring the distance between a transmitting end and a receiving end; if the distance is smaller than a preset distance threshold value, opening more than two groups of transmitting points and receiving points simultaneously; collecting the electric signals of the signals transmitted by the transmitting points received by the receiving points opened by the receiving end; and respectively judging whether the signal intensity of the acquired electric signals is lower than the corresponding electric signal threshold value, and if the signal intensity of at least one electric signal is lower than the corresponding electric signal threshold value, judging that the light curtain is blocked.

Aiming at the problems in the prior art, the invention also provides a device for controlling the light curtain, which comprises the following components:

the device comprises a distance acquisition module, a light path starting module, an acquisition module and a judgment module; the distance acquisition module is used for acquiring the distance between the transmitting end and the receiving end; the light path starting module is used for judging that the distance is smaller than a preset distance threshold value and simultaneously opening more than two groups of transmitting points and receiving points; the acquisition module is used for acquiring the electric signals of the signals transmitted by the transmitting points received by the receiving points opened by the receiving end; the judging module is used for respectively judging whether the signal intensity of the acquired electric signals is lower than the corresponding electric signal threshold value, and if the signal intensity of at least one electric signal is lower than the corresponding electric signal threshold value, the light curtain is judged to be shielded.

The invention has the beneficial effects that: when the distance between the transmitting end and the receiving end of the elevator light curtain is smaller than a preset distance threshold value, more than two groups of transmitting points and receiving points are opened simultaneously, and the total scanning time of the light curtain is reduced under the condition that the number of the combinations of the transmitting points and the receiving points is certain.

Drawings

FIG. 1 is a schematic flow chart of a method of controlling a light curtain according to an embodiment;

FIG. 2 is a schematic flow chart diagram of determining a voltage threshold corresponding to a distance between a transmitting end and a receiving end, according to an embodiment;

FIG. 3 is a schematic diagram of the combination of the light curtain emitting point and the receiving point of the embodiment of FIG. 2;

FIG. 4 is a graph of gain ratio as a function of distance between the transmitting end and the receiving end in the embodiment of FIG. 2;

fig. 5 is a schematic structural diagram of an apparatus for controlling a light curtain according to an embodiment.

Detailed Description

In order to further explain the technical means and effects of the present invention, the following description of the present invention with reference to the accompanying drawings and preferred embodiments is provided for a clear and complete description of the technical solutions of the present invention.

The door opened and closed by the light curtain can be applied to a plurality of application scenes, such as an elevator door, a subway door and the like. The following examples are described with respect to elevator light curtains.

Fig. 1 is a schematic flow chart of a method of controlling a light curtain according to an embodiment. As shown in fig. 1, a method of controlling a light curtain, comprising:

s101, obtaining the distance between a transmitting end and a receiving end.

The distance between the transmitting end and the receiving end of the elevator light curtain; since the transmitting end and the receiving end of the light curtain are respectively spaced from the surface of the light curtain filter by a certain distance, the distance between the transmitting end and the receiving end of the light curtain is not 0 even when the door is closed.

And S102, if the distance is smaller than a preset distance threshold, simultaneously opening more than two groups of transmitting points and receiving points.

As a preferred embodiment, if the distance is smaller than the first distance threshold, turning on m groups of transmitting points and receiving simultaneously; if the distance is smaller than a second distance threshold value, simultaneously opening n groups of transmitting points and receiving; if the distance is greater than all preset distance thresholds, only one group of transmitting points and receiving points is opened at each time, for example, when the distance between a receiving end and a transmitting end is 0.8m, two groups of transmitting points and receiving points are opened simultaneously; when the distance between the receiving end and the transmitting end is 0.5m, four groups of transmitting points and receiving points are opened simultaneously, so that all the receiving points can be scanned more quickly under the condition that the total number of the transmitting points and the receiving points is constant.

S103, collecting the electric signals of the signals transmitted by the transmitting points received by the receiving points opened by the receiving end.

As a preferred embodiment, the electrical signal is a voltage signal, and the voltages of all receiving points with the receiving end turned on are collected, and the voltages of the receiving points are calculated by the following formula:

U＝E·const (1)

where U is the voltage of the receiving point, E is the received power of the receiving point, const is a circuit constant.

And S104, respectively judging whether the signal intensity of the acquired electric signals is lower than the corresponding electric signal threshold value, and if the signal intensity of at least one electric signal is lower than the corresponding electric signal threshold value, judging that the light curtain is blocked.

If two groups of transmitting points and receiving points are opened simultaneously, the light curtain is judged to be shielded as long as the signal intensity of one collected electric signal is lower than the corresponding electric signal threshold value. For example, if four groups of transmitting points and receiving points are opened simultaneously, as long as the signal intensity of one collected electric signal is lower than the corresponding electric signal threshold value, the light curtain is judged to be blocked, and after the blocking signal of the light curtain is sent to the main controller of the elevator, the main controller commands the door controller to stop closing the door and reversely open the door. And if the signal intensity of all the collected electric signals is higher than the corresponding electric signal threshold value, judging that the light curtain is not blocked, and continuously closing the elevator door.

Before step S104, an electrical signal threshold corresponding to the distance between the transmitting end and the receiving end needs to be predetermined; as a preferred embodiment, the predetermined threshold of the electrical signal corresponding to the distance between the transmitting end and the receiving end may be implemented as follows: setting the distance between a transmitting end and a receiving end, and collecting electric signals of transmitting signals of the same group of transmitting points when the receiving points are not shielded under the distance condition; determining a first intermediate electrical signal corresponding to the distance from the electrical signal; determining a second intermediate electric signal corresponding to the distance according to the electric signal and the gain ratio corresponding to the distance; determining an electrical signal threshold corresponding to the distance according to the first intermediate electrical signal and the second intermediate electrical signal;

wherein, still include the step of confirming the gain ratio that said distance corresponds to: acquiring the transmitting power of a transmitting point; acquiring first receiving power of the receiving point for receiving the transmitting signals of the same group of transmitting points and second receiving power of the receiving point for receiving the transmitting signals of the adjacent group of transmitting points under the distance condition; dividing the first received power by the transmitted power to obtain a first power gain under the distance condition, and dividing the second received power by the transmitted power to obtain a second power gain under the distance condition; and dividing the first power gain by the second received power to obtain a gain ratio corresponding to the distance.

The beneficial effect of this embodiment does: when the distance between the transmitting end and the receiving end of the elevator light curtain is smaller than a preset distance threshold value, the transmitting points and the receiving points which are more than two groups are opened simultaneously, the total scanning time of the light curtain is reduced under the condition that the number of the combinations of the transmitting points and the receiving points is certain, the time for the light curtain to be shielded to stop closing the door of the door machine is short, and the user experience is improved.

The electrical signal of the light curtain receiving point may be a current signal, a voltage signal, or other forms of electrical signals, and the following embodiments are explained with reference to the voltage signal.

Fig. 2 is a schematic flowchart of determining a voltage threshold corresponding to a distance between an emitting end and a receiving end according to an embodiment, and fig. 3 is a schematic diagram of a combination relationship between an emitting point and a receiving end of a light curtain according to the embodiment of fig. 2. As shown in fig. 2, the step of predetermining a voltage threshold corresponding to the distance between the transmitting end and the receiving end includes:

s201, setting the distance L between the transmitting end and the receiving end₀Acquiring a receiving point T under the distance condition_nReceiving the same group of emission points R when not shielded_nAn electrical signal of the signal is transmitted.

S202, determining a first intermediate voltage U corresponding to the distance according to the voltage_f。

As a preferred embodiment, the first intermediate voltage U is determined by the following equation_f：

U_f＝k₁·U_max(2)

Wherein k is₁Is a constant, U, with a value in the range (0,1)_maxThe voltage is used for receiving the signals transmitted by the same group of transmitting points when the receiving points are not shielded.

S203, acquiring the transmitting power E of the transmitting point₀(ii) a Obtaining a receiving point R under the distance condition_nReceiving same group of transmitting points T_nFirst received power E of the transmitted signal_nnReceiving adjacent groups of transmission points T_mSecond received power E of the transmitted signal_mn。

As a preferred embodiment, the relationship between the received power and the transmitted power is as follows:

${\mathrm{El}}^2=E_0\·COS(\∂)---\left(3\right)$

wherein,E₀is the transmission power of the transmitting point, E is the received power of the receiving point, and l is the distance between the transmitting end and the receiving end.

S204, the first receiving power E is used_nnDivided by the transmission power E₀Obtaining a first power gain C under the distance condition_nnThe second received power E is adjusted_mnDivided by the transmission power E₀Obtaining a second power gain C under the distance condition_mn。

As a preferred embodiment, the first power gain is calculated by equations (4) to (7):

$C_{nn}=\frac{E_{nn}}{E_0}---\left(4\right)$

$E_{nn}=E_0\·\frac{cos\left(\mathrm{\α}\right)}{L_{nn}}---\left(5\right)$

$\cos \left(\mathrm{\α}\right)=\frac{L_0}{L_{nn}}---\left(6\right)$

according to the Pythagorean theorem:

$L_{nn}=\sqrt{L_0^2+Q^2}---\left(7\right)$

is prepared from formula (4)The result of (1) to (7),

calculating a second power gain by equations (8) to (11):

$C_{mn}=\frac{E_{mn}}{E_0}---\left(8\right)$

$E_{mn}=E_0\·\frac{cos\left(\mathrm{\β}\right)}{L_{mn}}---\left(9\right)$

$cos\left(\mathrm{\β}\right)=\frac{L_0}{L_{mn}}---\left(10\right)$

according to the Pythagorean theorem:

$L_{mn}=\sqrt{L_0^2+{(P-Q)}^2}---\left(11\right)$

obtained from the equations (8) to (11),

wherein E is₀Is the transmission power of the transmission point, E_nnIs that the receiving point receives the first receiving power of the signals transmitted by the transmitting points in the same group, E_mnIs that the receiving point receives a second received power of the signals transmitted by the adjacent group of transmitting points, C_nnIs the first power gain, C_mnIs the second power gain, L₀Is the distance, L, between the emitting end and the receiving end of the light curtain_nnIs the distance between the receiving point and the transmitting point of the same group, L_mnIt is the distance between the receiving point and the adjacent group of transmitting points, α is the angle between the horizontal axis and the connecting line between the receiving point and the same group of transmitting points, β is the angle between the horizontal axis and the connecting line between the receiving point and the adjacent group of transmitting points, P is the distance between two adjacent transmitting points, Q is the vertical distance between the same group of transmitting points and the receiving point.

S205, the first power gain C is obtained_nnDivided by the second received power C_mnObtaining the gain ratio corresponding to the distance

As a preferred embodiment, the gain ratio corresponding to the distance is:

$\frac{C_{nn}}{C_{mn}}=\frac{{(L_0^2+{\left(P-Q\right)}^2)}^{1.5}}{{(L_0^2+Q^2)}^{1.5}}---\left(12\right)$

s206, determining a second intermediate voltage corresponding to the distance according to the voltage and the gain ratio corresponding to the distance; determining a threshold voltage corresponding to the distance according to the first intermediate voltage and the second intermediate voltage;

as a preferred embodiment, the second intermediate voltage U is determined by the following equation_f' is:

${U_f}^{\′}=\frac{1}{k_2}\·U_{max}$

determining a threshold voltage corresponding to the distance by:

$U_{ff}=k_1\·U_{max}+\frac{1}{k_2}\·U_{max}$

wherein k is₂Is the gain ratio corresponding to the distance,

as known at P, Q, the gain ratio can be made according to gain ratio equation (12)Light following curtainA graph of the change in distance between the transmitting end and the receiving end is shown in fig. 4. For example, when L is₀When the gain ratio is less than 460mm, the gain ratio of the same group is more than 10, and the condition that a group of receiving points and transmitting points are independently opened is considered, if the condition that the shielding between the receiving points and the transmitting points is judged at the moment is the acquired voltage U_nLess than threshold voltage U_ffFirst intermediate voltage U_fVoltage U corresponding to the voltage without shielding_maxThe relationship between may be:

U_f＝0.5*U_max

first intermediate voltage U_fVoltage U corresponding to the voltage without shielding_maxThe relationship between may be:

U_f'＝0.1*U_max

then, when the two sets of emission points and emission point are turned on simultaneously, it is required to turn on U_ffThe method comprises the following steps:

U_ff＝0.5*U_max+0.1*U_max＝0.6*U_max。

it should be noted that, when the distance between the transmitting end and the receiving end is smaller than a preset distance threshold, more than three groups of transmitting points and receiving points may be opened simultaneously; if three or more groups are turned on simultaneously, only the influence of one group not at the edge being sandwiched between the other two groups can be considered twice as much as the influence of the single group, and if the two groups are further apart, the influence of the non-adjacent groups can be ignored because the gain of the single group of the adjacent group is much smaller than that of the adjacent group which is already 20:1 (when the distance between the transmitting end and the receiving end is 460mm, the two groups are 10:1 in sum).

This embodiment calculates the gain ratioAnd obtaining a series of gain values corresponding to the distance between the light curtain transmitting end and the light curtain receiving end by using an expression of the distance between the light curtain transmitting end and the light curtain receiving end. When obtaining the determined light curtain emission end andthe distance of the receiving end, according to its corresponding gain value, can predetermine the voltage threshold corresponding to the distance between the transmitting end and the receiving end.

The present invention also provides an apparatus for controlling a light curtain based on the same idea as the method of controlling a light curtain in the above-described embodiments. For convenience of explanation, only the parts related to the embodiments of the present invention are shown in the schematic structural diagram of the embodiments of the apparatus for controlling the light curtain, and those skilled in the art will understand that the illustrated structure does not constitute a limitation of the apparatus, and may include more or less components than those illustrated, or combine some components, or arrange different components.

Fig. 5 is a schematic structural diagram of an apparatus for controlling a light curtain according to an embodiment. As shown in fig. 5, the apparatus for controlling a light curtain includes: the distance acquisition module 100, the light path starting module 200, the acquisition module 300 and the judgment module 400; the distance obtaining module 100 is configured to obtain a distance between a transmitting end and a receiving end; the light path starting module 200 is configured to determine that the distance is smaller than a preset distance threshold, and simultaneously open more than two groups of transmitting points and receiving points; the collecting module 300 is configured to collect an electrical signal of a receiving point opened by the receiving end receiving a signal transmitted by a transmitting point; the judging module 400 is configured to respectively judge whether the signal strength of the acquired electrical signals is lower than a corresponding electrical signal threshold, and if the signal strength of at least one electrical signal is lower than a corresponding electrical signal threshold, judge that the light curtain is blocked.

As a preferred embodiment, the device for controlling a light curtain further comprises: an electrical signal threshold determination module (not shown); the electric signal threshold value determining module is used for determining an electric signal threshold value corresponding to the distance between the transmitting end and the receiving end in advance.

As a preferred embodiment, the electrical signal threshold determination module comprises: the acquisition unit (not marked in the figure) is used for setting the distance between the transmitting end and the receiving end and acquiring the electric signals of the transmitting signals of the same group of transmitting points when the receiving points are not shielded under the distance condition; a first intermediate electrical signal determination unit (not shown) for determining a first intermediate electrical signal corresponding to the distance from the electrical signal; a second intermediate electric signal determining unit (not shown) for determining a second intermediate electric signal corresponding to the distance from the electric signal and the gain ratio corresponding to the distance; an electrical signal threshold determining unit (not shown) for determining an electrical signal threshold corresponding to the distance according to the first intermediate electrical signal and the second intermediate electrical signal; the gain ratio determining unit (not shown in the figure) is configured to obtain a transmission power of a transmission point, obtain a first receiving power at which a receiving point receives transmission signals of the same group of transmission points and a second receiving power at which a receiving point receives transmission signals of an adjacent group of transmission points under the distance condition, divide the first receiving power by the transmission power to obtain a first power gain under the distance condition, divide the second receiving power by the transmission power to obtain a second power gain under the distance condition, and divide the first power gain by the second receiving power to obtain a gain ratio corresponding to the distance.

As a preferred embodiment, the electric signal is a voltage signal, and the first intermediate electric signal determination unit calculates the first intermediate voltage U by the following equation_f：

U_f＝k₁·U_max

Wherein k is₁Is a constant, U, with a value in the range (0,1)_maxReceiving the voltage of the signals transmitted by the same group of transmitting points when the receiving points are not shielded;

the second intermediate electric signal determination unit calculates the second intermediate voltage U by the following equation_f' is:

${U_f}^{\′}=\frac{1}{k_2}\·U_{max}$

wherein k is₂Is the gain ratio corresponding to the distance,

the beneficial effect of this embodiment does: when the distance between the transmitting end and the receiving end of the elevator light curtain is smaller than a preset distance threshold value, the transmitting points and the receiving points of more than two groups of numbers are opened simultaneously, and under the condition that the number of the combinations of the transmitting points and the receiving points is certain, the times of judging whether the light curtain is shielded are reduced, the total scanning time of the light curtain is reduced, the time of the light curtain shielding the door machine to stop closing the door is short, and the user experience is improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A method of controlling a light curtain, comprising:

acquiring the distance between a transmitting end and a receiving end;

if the distance is smaller than a preset distance threshold value, opening more than two groups of transmitting points and receiving points simultaneously;

collecting the electric signals of the signals transmitted by the transmitting points received by the receiving points opened by the receiving end;

and respectively judging whether the signal intensity of the acquired electric signals is lower than the corresponding electric signal threshold value, and if the signal intensity of at least one electric signal is lower than the corresponding electric signal threshold value, judging that the light curtain is blocked.

2. The method of controlling a light curtain as claimed in claim 1, further comprising: an electrical signal threshold corresponding to the distance between the transmitting end and the receiving end is predetermined.

3. The method of controlling a light curtain as claimed in claim 2, wherein the step of predetermining an electrical signal threshold corresponding to the distance between the transmitting end and the receiving end comprises:

setting the distance between a transmitting end and a receiving end, and collecting electric signals of transmitting signals of the same group of transmitting points when the receiving points are not shielded under the distance condition;

determining a first intermediate electrical signal corresponding to the distance from the electrical signal; determining a second intermediate electric signal corresponding to the distance according to the electric signal and the gain ratio corresponding to the distance; determining an electrical signal threshold corresponding to the distance from the first and second intermediate electrical signals;

wherein, the method also comprises the step of determining the gain ratio corresponding to the distance under the condition that the receiving point is not blocked:

acquiring the transmitting power of a transmitting point;

acquiring first receiving power of the receiving point for receiving the transmitting signals of the same group of transmitting points and second receiving power of the receiving point for receiving the transmitting signals of the adjacent group of transmitting points under the distance condition;

dividing the first received power by the transmitted power to obtain a first power gain under the distance condition, and dividing the second received power by the transmitted power to obtain a second power gain under the distance condition;

and dividing the first power gain by the second received power to obtain a gain ratio corresponding to the distance.

4. The method of claim 3, wherein the electrical signal is a voltage signalDetermining said first intermediate voltage U by_f：

U_f＝k₁·U_max

Wherein k is₁Is a constant, U, with a value in the range (0,1)_maxReceiving the voltage of the signals transmitted by the same group of transmitting points when the receiving points are not shielded;

determining the second intermediate voltage U by_f' is:

${U_f}^{\′}=\frac{1}{k_2}\·U_{max}$

wherein k is₂Is the gain ratio corresponding to the distance,

5. the method of claim 1, wherein the step of simultaneously turning on two or more groups of emitting points and receiving points if the distance is less than a predetermined distance threshold comprises:

if the distance is smaller than a first distance threshold value, simultaneously opening m groups of transmitting points and receiving;

if the distance is smaller than a second distance threshold value, simultaneously opening n groups of transmitting points and receiving;

the first distance threshold is larger than the second distance threshold, m is smaller than n, m is larger than or equal to 2, and m and n are integers.

6. The method of controlling a light curtain as claimed in claim 3, wherein the voltage of the receiving point is calculated by:

U＝E·const

where U is the voltage of the receiving point, E is the received power of the receiving point, const is a circuit constant.

7. An apparatus for controlling a light curtain, comprising: the device comprises a distance acquisition module, a light path starting module, an acquisition module and a judgment module;

the distance acquisition module is used for acquiring the distance between the transmitting end and the receiving end;

the light path starting module is used for judging that the distance is smaller than a preset distance threshold value and simultaneously opening more than two groups of transmitting points and receiving points;

the acquisition module is used for acquiring the electric signals of the signals transmitted by the transmitting points received by the receiving points opened by the receiving end;

the judging module is used for respectively judging whether the signal intensity of the acquired electric signals is lower than the corresponding electric signal threshold value, and if the signal intensity of at least one electric signal is lower than the corresponding electric signal threshold value, the light curtain is judged to be shielded.

8. The apparatus for controlling a light curtain as claimed in claim 7, further comprising: an electrical signal threshold determination module;

the electric signal threshold value determining module is used for determining an electric signal threshold value corresponding to the distance between the transmitting end and the receiving end in advance.

9. The apparatus for controlling a light curtain as claimed in claim 8, wherein the electrical signal threshold determination module comprises:

the acquisition unit is used for setting the distance between the transmitting end and the receiving end and acquiring the electric signals of the transmitting signals of the same group of transmitting points when the receiving points are not shielded under the distance condition;

a first intermediate electric signal determination unit for determining a first intermediate electric signal corresponding to the distance from the electric signal;

a second intermediate electric signal determination unit for determining a second intermediate electric signal corresponding to the distance from the electric signal and a gain ratio corresponding to the distance;

an electric signal threshold value determining unit, configured to determine an electric signal threshold value corresponding to the distance according to the first electric signal voltage and the second electric signal voltage;

wherein the electrical signal threshold determination module further comprises:

a gain ratio determination unit for acquiring the transmission power of the transmission point;

acquiring first receiving power of the receiving point for receiving the transmitting signals of the same group of transmitting points and second receiving power of the receiving point for receiving the transmitting signals of the adjacent group of transmitting points under the distance condition;

dividing the first received power by the transmitted power to obtain a first power gain under the distance condition, and dividing the second received power by the transmitted power to obtain a second power gain under the distance condition;

and dividing the first power gain by the second received power to obtain a gain ratio corresponding to the distance.

10. The apparatus of claim 9, wherein the electrical signal is a voltage signal, and the first intermediate voltage determining unit calculates the first intermediate voltage U by_f：

U_f＝k₁·U_max

Wherein k is₁Is a constant, U, with a value in the range (0,1)_maxReceiving the voltage of the signals transmitted by the same group of transmitting points when the receiving points are not shielded;

the second intermediate voltage determining unit calculates the second intermediate voltage U by the following equation_f' is:

${U_f}^{\′}=\frac{1}{k_2}\·U_{max}$

wherein k is₂Is the gain ratio corresponding to the distance,