CN103760426B - A kind of complex electromagnetic environment measure based on vector - Google Patents

Abstract

The invention belongs to electronic information test assessment technical field, a kind of complex electromagnetic environment based on vector tolerance system and measure are disclosed, described tolerance system comprises: electromagnetic environment parameter acquisition system, electromagnetic environment tolerance system, electromagnetic environment parameter acquisition system is measured system by network and electromagnetic environment and is connected, electromagnetic environment parameter acquisition system is made up of spectrum analyzer, signal direction-finding system and system time service device, described system time service device respectively with spectrum analyzer, signal direction-finding system time system device be connected; Described measure adopts and sets up electromagnetic environment parameter Data centre, the tested electronic information parameter of typing, carries out electromagnetic environment complexity calculating, the invention solves tested electronic message unit and faced electromagnetic environment complexity evaluation problem, achieve the accurate measurement of each key element of electromagnetic environment, for electronic information test qualification and electronic information electromagnetic environment acclimatization training provide electromagnetic environment installation warrants.

Description

A kind of complex electromagnetic environment measure based on vector

Technical field

The invention belongs to electronic information test assessment technical field, particularly relate to a kind of complex electromagnetic environment based on the vector tolerance system and measure evaluated for electromagnetic environment when the assessment of electronic information testing circumstance and electronic information acclimatization training.

Background technology

Along with the continuous progress of science and technology, all kinds of equipment frequently is on the increase, and various electromagnetic radiation source quantity exponentially increases, and electromagnetic environment is more and more complicated. Along with electronic information is to systematize, synthesization, networking and integration development, electromagnetic environment worsens day by day, and complex electromagnetic environment problem more and more becomes the major issue of tie society public safety, national defence and army building. People start progressively to pay attention to complex electromagnetic environment problem, and have dropped into a large amount of man power and materials and carried out correlative study.

Under qualification test electronic information carried out under complex electromagnetic environment and complex electromagnetic environment during electronic information acclimatization training, all need to solve a very actual problem, how to measure the problem of complex electromagnetic environment; The equipment also measured without any relevant electromagnetic environment complexity in society now, more without any relevant report. Part document is only had to relate to the assessment of electromagnetic environment, such as, in complex electromagnetic environment evaluation criteria (" combined-arms tactical training complex electromagnetic environment series standard "), fully consider the indispensable element that the complex electromagnetic environments such as time domain, frequency domain, energy territory are formed, but regrettably the document does not consider the assessment of the degree of correlation of each key element of complex electromagnetic environment and tested electronic information, and same electromagnetic environment is had different responsiveness by namely different electronic informations.In some academic publications, assess although having started openly to carry out the complex electromagnetic environment based on the degree of correlation, but process is loaded down with trivial details.

Summary of the invention

For the complex electromagnetic environment evaluation problem faced when solving electronic information test, training, the present invention provides a kind of complex electromagnetic environment based on vector tolerance system and measure, by applying the achievement in research of this invention, can very objectively identify that electronic information is faced the complexity of electromagnetic environment, also for electronic information test, training time complex electromagnetic environment offer foundation is set.

For achieving the above object, the present invention adopts following technical scheme:

A kind of complex electromagnetic environment based on vector tolerance system, comprise: electromagnetic environment parameter acquisition system, electromagnetic environment tolerance system, described electromagnetic environment parameter acquisition system is measured system by network and electromagnetic environment and is connected, described electromagnetic environment parameter acquisition system is made up of spectrum analyzer, signal direction-finding system and system time service device, described system time service device respectively with spectrum analyzer, signal direction-finding system time system device be connected; And system time service device is by the time system of spectrum analyzer, signal direction-finding system, and whole data collecting system is carried out time service; Described electromagnetic environment tolerance system is made up of Data centre, data computing center and display terminal device, described Data centre is connected with display terminal equipment through data computing center by data line, described data computing center has electromagnetic environment parameter electronic information faced and design itself parameter carries out the calculation of correlation of electromagnetic environment complexity, calculation result transfers to output display terminating unit, carries out electromagnetic environment complexity display.

Based on a complex electromagnetic environment tolerance system for vector, described electromagnetic environment parameter acquisition system is internet by network, or is connected for local area network or for gpib interface card or for GPIB turns usb card with electromagnetic environment tolerance system.

Based on a complex electromagnetic environment tolerance system for vector, described Data centre is made up of data processing unit and disk array, and described data processing unit is connected with the database of Data centre's disk array; The parameter recorded is transferred to Data centre by network, is stored into, after data processing unit processes, the database being arranged in Data centre's disk array; The parameter that reception in database, process and stored parameter measuring system record is: electromagnetic environment power spectrum signal, electromagnetic environment signal function time, electromagnetic environment signal come ripple orientation;

Wherein, described data processing unit comprises: the function module of the classification of data sink, data screening, data and data processing, database on described disk array is that data loading draws taking time, store the parameter of the corresponding electromagnetic environment of different time, database on described disk array comprises: horizontal polarization signals parameter and vertical polarization signal parameter, horizontal polarization signals parameter and vertical polarization signal parameter, its total signal function time, signal carry out ripple direction parameter, and respectively containing horizontal polarization signals power spectrum, vertical polarization power spectrum signal.

Based on a complex electromagnetic environment tolerance system for vector, described data computing center calculates unit by tested electronic information parameter input unit and electromagnetic environment complexity and forms; Described tested electronic information parameter input unit calculates unit by data line and electromagnetic environment complexity and is connected;

Described tested electronic information parameter input unit is mainly used in receiving user's input information, stores tested system works bandwidth, polarization mode, system antenna space scanning rule and Estimated Time Of Operation;The electromagnetic environment parameter that electronic information is faced by described electromagnetic environment complexity correlation calculation unit and design itself parameter carry out the calculation of correlation of electromagnetic environment complexity.

A kind of complex electromagnetic environment based on vector tolerance system, the electromagnetic environment complexity calculation result that described display terminal equipment faces for showing tested electronic information, comprise display: electromagnetic spectrum display, the display of electromagnetism signal time domain, polar coordinates carry out the display of ripple orientation, and the various take off data of electromagnetic environment, parameter size, electromagnetic environment complexity.

Based on a measure for the complex electromagnetic environment tolerance system of vector, its step is as follows:

Step one: electromagnetic environment parameter is carried out data gathering, set up electromagnetic environment parameter Data centre, carry out the electromagnetic environment parameter of ripple orientation, horizontal polarization power spectrum, vertical polarization power spectrum by setting up not signal in the same time, and it is stored on the large storage facilities of disk array; By local area network network or internet, each parameter information gathered is transferred to Data centre, after data processing, typing centre data storehouse stores;

Step 2: the tested electronic information parameter of typing, in the parameters of the tested electronic information parameter input unit input Device under test of data computing center, comprising: estimate tested system boot working hour, system works bandwidth, the Research of Antenna Polarization, antenna direction map space scanning rule rule and Estimated Time Of Operation;

Step 3: electromagnetic environment complexity calculates, electromagnetic environment parameter and tested electronic information parameter, the calculating unit of the electromagnetic environment complexity simultaneously being inputted data computing center by data line is calculated; This calculating unit is according to complicated dynamic behaviour rule calculated level polarity electromagnetic circumstance complication degree �� respectively^��With vertical polarization electromagnetic environment complexity ��^��; Then the metric form marked on a map by vector finally determines the complex electromagnetic environment complexity that tested electronic information faces;

Its step is as follows:

1), first calculated level polarize under the degree of correlation,

2) degree of correlation under vertical polarization, is then calculated;

3), finally according to the polarization mode of tested system antenna, the degree of correlation of the level originally calculated and vertical polarization is projected to the direction of polarization of tested antenna, is obtained the complexity of final electromagnetic environment by the mode of Vector modulation; Its concrete steps are as follows:

A. when moment i, horizontal polarization complexityComputation rule is:

When calculating appointment moment i respectively, the power spectrum complexity of horizontal polarizationWith the spatial complex degree coming ripple orientation and causingAbove-mentioned degree of correlation information is multiplied, this electronic information face in the i moment horizontal polarization complex electromagnetic environment degree of correlationEquation expression is:

(1) horizontal polarization power spectrum complexityCalculate: when reading in moment i, electromagnetic environment level polarization power spectrum, and tested electronic device works frequency band; Band internal power is the power spectrum degree of correlation divided by total power;

Equation expression is: ${\mathrm{\ρ}}_{\mathrm{Wi}}^{//}=\frac{P_{\mathrm{in}}}{P_{\mathrm{all}}}\×100\%$

In formula: P_inFor being with interior horizontal polarization power, P_allFor electromagnetic environment total power;

(2) spatial complex degreeCalculate: when reading in moment i, horizontal polarization signals comes ripple orientationAccording to the sensing �� of tested electronic information now beam of an antenna, can obtain space complexity according to tested system antenna directional pattern is:In formula: f (��) is tested electronic information Antenna Operation directional pattern;

B., in the computation process of spatial complex degree, only consider that electromagnetic environment signal enters by lifetime measurement system from tested system antenna actinal surface, and do not consider that signal is coupled into system by cable or other approach;

Spatial complex degree computation rule is:

(1), time according to moment i, horizontal polarization complicated dynamic behaviour rule can obtain horizontal polarization complexity

(2) also can the vertical polarization complex electromagnetic environment degree of correlation that faces of this electronic information with reason

(3) according to the work polarization mode of tested electronic information antenna, by the horizontal polarization electromagnetic environment degree of correlationWith the vertical polarization electromagnetic environment degree of correlationCarry out Vector modulation;

The transverse axis X of Vector modulation represents horizontal polarization degree of correlation component, and longitudinal axis Y represents vertical polarization degree of correlation component; Vector Z represents the polarization mode of operation of tested electronic message unit antenna;

If Device under test works in horizontal polarization, then represent horizontal polarization degree of correlation component with transverse axis X parallel for vector Z;

If vertical polarization, with longitudinal axis, by the horizontal polarization electromagnetic environment degree of correlationWith the vertical polarization electromagnetic environment degree of correlationCarry out Vector modulation to obtainWillProject to vector Z, the electromagnetic environment complexity �� that when can obtain moment i, tested electronic information faces_i;

In time domain, above-mentioned calculation result is averaged, the complex electromagnetic environment complexity �� that faces of final tested electronic information,

Equation expression is:In formula: N is according to tested System production time and data sampling frequency gained number of data points.

Step 4: according to the show, by data line, the electromagnetic environment parameter that electromagnetic environment complexity data processing centre (DPC) calculated and measurement obtain exports to the display of display terminal equipment to number of terminals, inquires about for user.

Owing to adopting technical scheme as above, the present invention has following superiority:

A kind of complex electromagnetic environment based on vector diagram tolerance system of the present invention and measure, the basic problem solving complex electromagnetic environment parameter acquisition and tolerance. Can effectively solve tested electronic message unit and be faced electromagnetic environment complexity evaluation problem. This invention identifies for electronic information test and electronic information electromagnetic environment acclimatization training provides electromagnetic environment installation warrants.

The present invention solves emphatically the tolerance of complex electromagnetic environment. By integrating existing surveying instrument, through integrated design, it is possible to realize the accurate measurement of each key element of electromagnetic environment. By the metric form of vector, fully consider each key element of electromagnetic environment and the tested electronic information degree of correlation, it is possible to tolerance electronic information very objective, science is tested, acclimatization training time faced the complexity of electromagnetic environment.

Accompanying drawing explanation

Fig. 1 is the compositional block diagram of complex electromagnetic environment tolerance system;

Fig. 2 is the circuit block diagram of the Data centre of complex electromagnetic environment tolerance system;

Fig. 3 is the circuit block diagram of the data computing center of complex electromagnetic environment tolerance system;

Fig. 4 is the workflow diagram of complex electromagnetic environment tolerance system;

Fig. 5 is complex electromagnetic environment metric calculation schema;

Fig. 6 is the horizontal polarization degree of correlationWith the vertical polarization degree of correlationCarry out Vector modulation schematic diagram.

Embodiment

Below in conjunction with accompanying drawing, invention is described further.

As shown in Figure 1, 2, 3: a kind of complex electromagnetic environment based on vector tolerance system, comprise: electromagnetic environment parameter acquisition system, electromagnetic environment tolerance system, described electromagnetic environment parameter acquisition system is measured system by network and electromagnetic environment and is connected, described electromagnetic environment tolerance system is made up of Data centre, data computing center and display terminal device, and described Data centre is connected with display terminal equipment through data computing center by data line. Described electromagnetic environment parameter acquisition system is made up of spectrum analyzer, signal direction-finding system and system time service device, described system time service device respectively with spectrum analyzer, signal direction-finding system time system device be connected; And system time service device is by the time system of spectrum analyzer, signal direction-finding system, and whole data collecting system is carried out time service.

Described electromagnetic environment parameter acquisition system will gather: electromagnetic environment power spectrum signal, electromagnetic environment signal function time, electromagnetic environment signal carry out the electromagnetic environment parameter that the tested electronic informations such as ripple orientation face and be transmitted through the network to Data centre, and are stored in the corresponding database of Data centre;Described Data centre is connected with data computing center by data line, described data computing center has electromagnetic environment parameter electronic information faced and design itself parameter carries out the calculation of correlation of electromagnetic environment complexity, calculation result transfers to output display terminating unit, carries out electromagnetic environment complexity display.

Described electromagnetic environment parameter acquisition system is internet or local area network by network or turns usb card by gpib interface card or GPIB and measure system with electromagnetic environment and be connected.

Described Data centre is made up of data processing unit and disk array, Data centre has for the electromagnetic environment parameter receiving, processing and stored parameter measuring system records, and the parameter of electromagnetic environment is: electromagnetic environment power spectrum signal, electromagnetic environment signal function time, electromagnetic environment signal come ripple orientation; As shown in Figure 2.

Wherein, described data processing unit is connected with the database of Data centre's disk array, described data processing unit comprises: the function module of the classification of data sink, data screening, data and data processing, database on disk array comprises: horizontal polarization signals parameter and vertical polarization signal parameter, horizontal polarization signals parameter and vertical polarization signal parameter, its shared signal action time, signal carry out ripple direction parameter, and respectively containing horizontal polarization signals power spectrum, vertical polarization power spectrum signal.

These parameters above-mentioned are transferred to Data centre by network, are stored into, after data processing unit processes, the database being arranged in Data centre's disk array; Database on described disk array is that data loading draws taking time, and the parameter of the corresponding electromagnetic environment of different time comprises: signal comes ripple orientation, horizontal polarization power spectrum, vertical polarization power spectrum.

Described data computing center forms as shown in Figure 3 by tested electronic information parameter input unit and electromagnetic environment complexity correlation calculation unit; Described tested electronic information parameter input unit is connected with electromagnetic environment complexity correlation calculation unit by data line;

Tested electronic information parameter input unit is mainly used to receive user's input information, stores tested system works bandwidth, polarization mode, the scanning of system antenna space rule and Estimated Time Of Operation etc.; Above-mentioned information passes to electromagnetic environment complexity by data line and calculates unit, this unit has electromagnetic environment parameter electronic information faced and tested electronic information design itself parameter carries out the calculation of correlation of electromagnetic environment complexity, finally calculation result is exported by control unit and transfer to display terminal equipment, carry out electromagnetic environment complexity display.

Described display terminal equipment is mainly used in showing the electromagnetic environment complexity calculation result that tested electronic information faces, and the various take off data of electromagnetic environment, comprise electromagnetic spectrum display, the display of electromagnetism signal time domain and polar coordinates and come each key element parameter size of electromagnetic environment, the electromagnetic environment complexities such as the display of ripple orientation.

Based on a measure for the complex electromagnetic environment tolerance system of vector, as shown in Figure 4,

Implementation step is as follows:

Step one: electromagnetic environment parameter is carried out data gathering, set up electromagnetic environment parameter Data centre, carry out the electromagnetic environment parameter of ripple orientation, horizontal polarization power spectrum, vertical polarization power spectrum by setting up not signal in the same time, and it is stored on the large storage facilities of disk array;By local area network network or internet, each parameter information gathered is transferred to Data centre, after data processing, typing centre data storehouse stores;

During DATA REASONING, measure demand according to complex electromagnetic environment, select test site. Owing to this system only can test the signal environment at receiving antenna place, so the selection of test site should take into account Device under test working space. The start self-inspection of electromagnetic environment parameter acquisition system. Main check system time service whether normal operation. Electromagnetic environment parameter collection can be started after system works is normal. Owing to considering that data store restriction, data acquisition time can be arranged with reference to the tested electronic information working hour.

Step 2: the tested electronic information parameter of typing, in order to be measured by electromagnetic environment complexity in conjunction with tested electronic information, needs the working parameter of the tested electronic information of typing here. In the parameters of the tested electronic information parameter input unit input Device under test of data computing center, the parameter collected is needed to comprise here: to estimate tested system boot working hour, system works bandwidth, the Research of Antenna Polarization, antenna direction map space scanning rule rule and Estimated Time Of Operation;

Step 3: electromagnetic environment complexity calculates, electromagnetic environment parameter and tested electronic information parameter, the calculating unit of the electromagnetic environment complexity simultaneously being inputted data computing center by data line is calculated; This calculating unit is according to complicated dynamic behaviour rule calculated level polarity electromagnetic circumstance complication degree �� respectively^��With vertical polarization electromagnetic environment complexity ��^��; Then the metric form marked on a map by vector finally determines the complex electromagnetic environment complexity that tested electronic information faces;

Its concrete steps are as follows:

1), first calculated level polarize under the degree of correlation,

2) degree of correlation under vertical polarization, is then calculated;

3), finally according to the polarization mode of tested system antenna, the degree of correlation of the level originally calculated and vertical polarization is projected to the direction of polarization of tested antenna, is obtained the complexity of final electromagnetic environment by the mode of Vector modulation; Its concrete steps are as follows:

A. when moment i, horizontal polarization complexityComputation rule is:

When calculating appointment moment i respectively, the power spectrum complexity of horizontal polarizationWith the spatial complex degree coming ripple orientation and causingAbove-mentioned degree of correlation information is multiplied, this electronic information face in the i moment horizontal polarization complex electromagnetic environment degree of correlationEquation expression is:

(1) horizontal polarization power spectrum complexityCalculate: when reading in moment i, electromagnetic environment level polarization power spectrum, and tested electronic device works frequency band; Band internal power is the power spectrum degree of correlation divided by total power;

Equation expression is: ${\mathrm{\ρ}}_{\mathrm{Wi}}^{//}=\frac{P_{\mathrm{in}}}{P_{\mathrm{all}}}\×100\%$

In formula: P_inFor being with interior horizontal polarization power, P_allFor electromagnetic environment total power;

(2) spatial complex degreeCalculate: when reading in moment i, horizontal polarization signals comes ripple orientationAccording to the sensing �� of tested electronic information now beam of an antenna, can obtain space complexity according to tested system antenna directional pattern is:In formula: f (��) is tested electronic information Antenna Operation directional pattern;

B. illustrate: in the computation process of spatial complex degree, only consider that electromagnetic environment signal enters by lifetime measurement system from tested system antenna actinal surface, and do not consider that signal is coupled into system by cable or other approach;

Spatial complex degree computation rule is:

(1), time according to moment i, horizontal polarization complicated dynamic behaviour rule can obtain horizontal polarization complexity

(2) also can the vertical polarization complex electromagnetic environment degree of correlation that faces of this electronic information with reason

(3) according to the work polarization mode of tested electronic information antenna, by the horizontal polarization electromagnetic environment degree of correlationWith the vertical polarization electromagnetic environment degree of correlationCarry out Vector modulation;

As shown in Figure 6, in figure, the transverse axis X of Vector modulation represents horizontal polarization degree of correlation component to Vector modulation, and longitudinal axis Y represents vertical polarization degree of correlation component; Vector Z represents the polarization mode of operation of tested electronic message unit antenna;

If Device under test works in horizontal polarization, then represent horizontal polarization degree of correlation component with transverse axis X parallel for vector Z;

If vertical polarization, with longitudinal axis, by the horizontal polarization electromagnetic environment degree of correlationWith the vertical polarization electromagnetic environment degree of correlationCarry out Vector modulation to obtainWillProject to vector Z, the electromagnetic environment complexity �� that when can obtain moment i, tested electronic information faces_i;

In time domain, above-mentioned calculation result is averaged, the complex electromagnetic environment complexity �� that faces of final tested electronic information,

Equation expression is:In formula: N is according to tested System production time and data sampling frequency gained number of data points.

Step 4: according to the show, by data line, the electromagnetic environment parameter that electromagnetic environment complexity data processing centre (DPC) calculated and measurement obtain exports to the display of display terminal equipment to number of terminals, inquires about for user.

Claims (1)

1. based on vector complex electromagnetic environment tolerance system a measure, it is characterized in that: its step is as follows:

Step one: electromagnetic environment parameter is carried out data gathering, set up electromagnetic environment parameter Data centre, carry out the electromagnetic environment parameter of ripple orientation, horizontal polarization power spectrum, vertical polarization power spectrum by setting up not signal in the same time, and it is stored on the large storage facilities of disk array; By local area network network or internet, each parameter information gathered is transferred to Data centre, after data processing, typing centre data storehouse stores;

Step 2: the tested electronic information parameter of typing, in the parameters of the tested electronic information parameter input unit input Device under test of data computing center, comprising: estimate tested system boot working hour, system works bandwidth, the Research of Antenna Polarization, antenna direction map space scanning rule rule and Estimated Time Of Operation;

Step 3: electromagnetic environment complexity calculates, electromagnetic environment parameter and tested electronic information parameter, the calculating unit of the electromagnetic environment complexity simultaneously being inputted data computing center by data line is calculated; This calculating unit is according to complicated dynamic behaviour rule calculated level polarity electromagnetic circumstance complication degree �� respectively^//With vertical polarization electromagnetic environment complexity ��^��; Then the metric form marked on a map by vector finally determines the complex electromagnetic environment complexity that tested electronic information faces; Its concrete grammar is as follows:

1), first calculated level polarize under the degree of correlation,

2) degree of correlation under vertical polarization, is then calculated;

3), finally according to the polarization mode of tested system antenna, the degree of correlation of the level originally calculated and vertical polarization is projected to the direction of polarization of tested antenna, is obtained the complexity of final electromagnetic environment by the mode of Vector modulation; Its concrete steps are as follows:

A. when moment i, horizontal polarization complexityComputation rule is:

When calculating appointment moment i respectively, the power spectrum complexity of horizontal polarizationWith the spatial complex degree coming ripple orientation and causingAbove-mentioned degree of correlation information is multiplied, this electronic information face in the i moment horizontal polarization complex electromagnetic environment degree of correlationEquation expression is:

(1) horizontal polarization power spectrum complexityCalculate: when reading in moment i, electromagnetic environment level polarization power spectrum, and tested electronic device works frequency band;Band internal power is the power spectrum degree of correlation divided by total power;

Equation expression is: ${\mathrm{\ρ}}_{Wi}^{//}=\frac{P_{in}}{P_{all}}\×100\%$

In formula: P_inFor being with interior horizontal polarization power, P_allFor electromagnetic environment total power;

(2) spatial complex degreeCalculate: when reading in moment i, horizontal polarization signals comes ripple orientationAccording to the sensing �� of tested electronic information now beam of an antenna, can obtain space complexity according to tested system antenna directional pattern is:In formula: f (��) is tested electronic information Antenna Operation directional pattern;

B., in the computation process of spatial complex degree, only consider that electromagnetic environment signal enters by lifetime measurement system from tested system antenna actinal surface, and do not consider that signal is coupled into system by cable or other approach;

Spatial complex degree computation rule is:

(1), time according to moment i, horizontal polarization complicated dynamic behaviour rule can obtain horizontal polarization complexity

(2) also can the vertical polarization complex electromagnetic environment degree of correlation that faces of this electronic information with reason

(3) according to the work polarization mode of tested electronic information antenna, by the horizontal polarization electromagnetic environment degree of correlationWith the vertical polarization electromagnetic environment degree of correlationCarry out Vector modulation;

The transverse axis X of Vector modulation represents horizontal polarization degree of correlation component, and longitudinal axis Y represents vertical polarization degree of correlation component; Vector Z represents the polarization mode of operation of tested electronic message unit antenna;

If Device under test works in horizontal polarization, then represent horizontal polarization degree of correlation component with transverse axis X parallel for vector Z;

If vertical polarization, with longitudinal axis, by the horizontal polarization electromagnetic environment degree of correlationWith the vertical polarization electromagnetic environment degree of correlationCarry out Vector modulation to obtainWillProject to vector Z, the electromagnetic environment complexity �� that when can obtain moment i, tested electronic information faces_i;

In time domain, above-mentioned calculation result is averaged, the complex electromagnetic environment complexity �� that faces of final tested electronic information,

Equation expression is:In formula: N is according to tested System production time and data sampling frequency gained number of data points;

Step 4: according to the show, by data line, the electromagnetic environment parameter that electromagnetic environment complexity data processing centre (DPC) calculated and measurement obtain exports to the display of display terminal equipment to number of terminals, inquires about for user.