RU2379699C2 - Method for remote control of metrological characteristics of radio-measurement devices based on example of metre for complex parametres of shf-devices - Google Patents

Abstract

FIELD: measurement equipment.

SUBSTANCE: invention is related to measurement equipment and may be used for remote control of metrological characteristics of radio measurement devices. In order to achieve this result, parametres are measured for calibration measures by metre of complex parametres of SHF-device. Voltages that bear information on actial components of measured S-parametres are formed and separated S-parametres. Analog-digital processing of measured information is carried out and forwarded along standard communication lines into testing laboratory, and metrological characteristics of metre for complex SHF-device are defined.

EFFECT: expansion of functional resources.

2 dwg

Description

The invention relates to the field of information-measuring systems and can be used for remote monitoring of the metrological characteristics of radio measuring instruments.

A known control system for the installation of oil collection [1], which contains primary measuring transducers, analog-to-digital converters, a computer server, computer operator station, and is designed to obtain information about the state of the controlled object. The disadvantage of the system is the need to create and operate an industrial local area network.

A known system of mobile telemedicine [2], designed for emergency electrocardiographic studies. The system comprises a cardio block, a mobile telephone modem, a handheld computer, and a computer server for receiving information. The disadvantage of the system is the transmission of data over cellular channels, i.e. dependence on coverage area.

As a prototype, a device was selected for remote monitoring of the condition of an overhead power line wire [3], which contains a housing equipped with fastening means on the power line wire, and a power unit and a measuring and transmitting module placed in the housing, designed to receive data on the state of the high-voltage overhead wire power lines and their transmission to a collection point. The disadvantage of the prototype is the transmission of data over cellular channels, i.e. Dependence on coverage area, or using a global positioning system.

The technical task is to eliminate the need for transportation of radio measuring instruments to a testing laboratory for the study of metrological characteristics.

The task is achieved by measuring the parameters of calibration measures with a meter of the complex parameters of microwave devices, performing analog-to-digital processing of the measurement information and transmitting it via standard communication lines to the testing laboratory, according to the received data, the metrological characteristics of the meter of complex parameters of microwave devices are determined. A laboratory that needs to study the metrological characteristics of a complex parameters meter for microwave devices receives high-precision calibration measures by mail from the metrological service (MS) or test laboratory (IL), using phase shift measures, VSWR measures, and an attenuator.

The proposed method is illustrated by the example of a complex parameters meter microwave devices by drawings:

Figure 1 - diagram of the measuring system: 1 - control computer; 2, 4 - modem; 3 - communication line; 5 - a computer with a controller CPC, which is part of the meter complex parameters of microwave devices; 6 - meter complex parameters of microwave devices; 7 - a set of measures; 8, 9 - printer.

Figure 2 - structural diagram of the meter: 10 - generator microwave signals; 11 - the first component of the measuring microwave path; 12 - the second component of the measuring microwave path; 13 - device for processing measurement information; 14 - a segment of the waveguide, which is a geometric analogue of the device under study; 15 - the third BUT; 16 - power divider; 17 - the fourth BUT; 18 - the first ferrite valve; 19 - the second ferrite valve; 20 - the first modulator is a switch; 21 - fifth ferrite valve; 22 - sixth ferrite valve; 23 - the second modulator is a switch; 24 - the third ferrite valve; 25 - the first balanced mixer; 26 - the first detector section; 27 - the second detector section; 28 - second balanced mixer; 29 - fourth ferrite valve; 30 - the first BUT; 31 - the second BUT.

Figure 1 shows the structure of the measuring system. The system includes a control computer 1, located in the MS, modems 2, 4, through which communication is carried out via standard communication lines 3, a computer with a controller KOP 5, which is part of the complex parameters of microwave devices, the complex parameters of microwave devices 6, reference set of measures 7, printers 8, 9.

The operation of the meter, the choice of measurement and calibration modes, as well as the choice of the presentation and recording of the measurement results are carried out from the keyboard of the control computer in the dialogue mode via a local network or the Internet.

Using a complex parameters meter microwave devices measure the parameters of measures. The operation of the parameter meter microwave devices is illustrated in figure 2 and is based on the principle of directional branching incident on the OI and reflected (or transmitted) from it microwave signal waves propagating in the measuring path of the meter; the formation and selection of voltages U _ijc (i, j = 1, 2), carrying information about the real components of the measured S-parameters, the amplification and discrete conversion of these voltages, the calculation using direct and inverse Fourier transforms of signals U _ijs , carrying information about imaginary components S-parameters; calculating the values of the measured parameters according to special algorithms using calibration parameters; reproducing the frequency dependences of the measured parameters either in the polar (parameters S ₁₁ and S ₂₂ ), or in the Cartesian coordinate system (all S-parameters) with readout of the values of S _ij and GVZ at any frequency (within the range of the operating frequencies of the meter) using a marker.

The meter (figure 2) contains a microwave signal generator 10, the first 11 component of the measuring microwave path, the second 12 component of the measuring microwave path, the device for processing the measurement information 13, the length of the waveguide 14, which is a geometric analogue of the device under study, a set of measures 7 .

The first 11 component of the measuring path contains a power divider 16, the first 30 and third 15 directional couplers, the first 18, third 24 and fifth 21 ferrite gates, the first 20 modulator-switch, the first 25 balanced mixer, the first 26 detector section.

The second 12 component of the measuring path contains a second 31 and a fourth 17 directional couplers, a second 19, a fourth 29 and a sixth 22 ferrite valves, a second 23 modulator-switch, a second 28 balanced mixer, a second 27 detection section.

The meter works as follows. The output signal of the UHFH 10 using a power divider 16 and the first 30, second 31, third 15 and fourth 17 directional couplers branches out and falls into the reference channels (OK) (signals in them pass through the secondary channels of the third 15 and fourth 17 directional couplers) and shoulders ring path, forming measuring channels (IR). The first 20 and second 23 modulator switches are included in the IR, to which either modulating or blocking voltage is supplied from the control outputs of the measuring information processing device 13. The extraction of microwave signals carrying information about the measured S-parameters is carried out using the first 30 and second 31 directional couplers. In this case, the first 30 directional coupler is oriented to microwave signals carrying information about S ₁₁ and S ₁₂ , and the second 31 directional coupler is oriented to microwave signals proportional to S ₂₁ and S ₂₂ .

In the waveguide path, the microwave signals are alternately propagated through the device 7 under study in opposite directions. This is achieved by alternately applying the modeling voltage to the first 20 or second 23 modulator-switches at different periods of frequency tuning. The supply of locking voltage modulators-switches to the first 20 or second 23 turns the latter into attenuators with great attenuation. Additional decoupling of the shoulders of the waveguide path in the corresponding periods of frequency tuning is carried out using the first 18, second 19, third 24, fourth 29, fifth 21 and sixth 22 ferrite gates. They, in addition, reduce errors due to inconsistencies in the first 20, second 23 modulator switches and the first 25, second 28 balanced mixers.

During calibration (mode S ₁₁ and S ₂₂ ), a segment of waveguide 14 is connected to the first waveguide outputs of the first 11 and second 12 of the component of the measuring path, and short-circuiting switches are connected to the second waveguide outputs. In mode S ₂₁ and S ₁₂ , segments of waveguides, which are geometric analogues of the device 7 under study, are connected to the first and second waveguide outputs. Arrays of signals containing information about the actual components of the calibration are recorded in the computer memory:

where i, j = 1, 2;

K _ij - proportionality coefficients that take into account the amplitude-frequency characteristics of the reference and measuring signals in the respective modes;

φ _нij - phase shifts that take into account the non-identical phase-frequency characteristics of these channels.

Using arrays of direct and inverse Fourier transforms, arrays are formed that carry information about the imaginary components of the calibration parameters:

When measuring, a segment of the waveguide 14 is connected to the first waveguide outputs of the first 11 and second 12 components of the measuring microwave path, and the device 7 under investigation is connected to the second waveguide outputs, signals carrying information about the actual

and imaginary

components of the measured S-parameters.

The real and imaginary components of the measured S-parameters are calculated using values (1) - (4) according to the formulas:

According to the data obtained, the metrological characteristics of the meter for complex parameters of microwave devices are determined.

The technical result is achieved by reducing the downtime of radio measuring devices when they are sent to the MS, by reducing harmful effects during transportation, automation of metrological work.

Information sources

[1] Dudnikov V., Yankina M., Savin S., Maksimenko V., Muryzhnikov A. Automated process control systems based on the GENESIS32 SCADA package: experience, solutions, developments. - “Modern Automation Technologies”, 2003, No. 2, p. 138

[2] www.ibp-ran.ru/Products/teleECG.htm

[3] B. Mekhanoshin, V. Shkaptsov. Device for remote monitoring of the state of an overhead power line wire. - Patent RU No. 2222858; 2002129160/09, 10.31.2002, 01.27.2004 Bull. No. 3, 7 H02J 13/00

Claims (1)

A method for remotely monitoring the metrological characteristics of radio measuring instruments for measuring complex parameters of microwave devices, which consists in measuring the parameters of calibration measures with a measuring device of complex parameters of microwave devices based on the use of high-precision calibration measures and the use of directional branches incident on the radiation object (OI) and microwave waves reflected from it (or passed through it), while transmitting measuring signals over standard communication lines in laboratory, carry out the formation and isolation of voltages that carry information about the real components of the measured S-parameters, carry out amplification and discrete conversion of these voltages, perform calculations based on the use of direct and inverse Fourier transforms - signals carrying information about the imaginary components of S-parameters, perform calculating the values of the measured parameters and reproducing the frequency dependences of the measured parameters in either the polar or the Cartesian coordinate system in Within the range of the operating frequencies of the meter using a marker, on the basis of the data obtained determine the metrological characteristics of the meter complex parameters of microwave devices.

Images