KR101345668B1 - Remote measuring instrument control system using wireless communication - Google Patents

Abstract

A remote measuring instrument control system using a wireless communication is disclosed. According to embodiments of the present invention, the remote measuring instrument control system can control and monitor conditions of measuring instruments in a remote site; can solve distance problems on installation, cost increasing problems, and a complex organization problem of the measuring instrument in the data transmission of a wired cable; and can accurately measure a subject by transmitting and receiving a wireless signal with a time division method or by transmitting and receiving the wireless signal using a different frequency from a measuring frequency. [Reference numerals] (110) Measuring device;(200) Remote controller (PC);(320) Low noise amplifier;(330) Variable local signal generator;(340) Variable filter;(350) Time division controller;(355) Memory;(358) Time division switch;(360) Signal coupler;(370) Transceiver

Description

Instrument remote control system using wireless communication {REMOTE MEASURING INSTRUMENT CONTROL SYSTEM USING WIRELESS COMMUNICATION}

The present invention relates to an instrument remote control system using wireless communication, and more particularly, to an instrument remote control system using wireless communication that eliminates signal interference and improves reliability of measurement signals by varying a frequency band used in wireless communication. .

In general, the instrument is divided into a general-purpose instrument and a dedicated instrument. General purpose instrument is not only used for specific products such as 'oscilloscope', 'digital multimeter', 'signal analyzer', 'spectrum analyzer', etc., but it is used to measure general electronic products. It refers to instruments that are used only for specific applications, such as 'protocol analyzer' and 'swr meter'.

Through such measuring instrument, data of measurement data on product specifications or structure status is dataized, and this data is analyzed and judged through a processing unit such as a computer to grasp the quality and safety state of the target product or facility. Predictive.

In the related art, most of the measuring instrument and the processing unit are connected by a wired cable such as a GPIB cable to perform data transmission. In this regard, Figure 1 is an exemplary view showing the interface between the computer and the instrument according to the prior art, according to the interface of the computer (PC) and a plurality of measurement periods, for example, various wired, such as GPIB, USB, LAN, and RS232 The communication method is used.

However, in the conventional meter control system using such a wired cable, a plurality of measuring instruments are required when there are many points of measurement objects, and at this time, a plurality of measuring instruments are connected to a computer to transmit signals. Wired cables connected between computers not only complicate the configuration of the equipment, but also have management problems such as entangled wires of several strands. In addition, since wired cables such as GPIB cables are expensive products, the use of multiple wired cables increases the installation cost of the measuring equipment itself, and the maintenance costs thereof. There is a problem that the holding distance between the computers is limited. In addition, the signal output from the sensor of the measuring point is output as a voltage from the signal amplifier, the longer the length of the wired cable, the greater the change in the cable resistance value due to temperature changes, the voltage output from the signal amplifier, such as a computer The difference between the voltage input to the processing unit is generated, there is a problem that can cause a measurement error between the actual measurement value and the measurement value accepted by the computer.

In order to solve this problem, an instrument control system using wireless communication has been considered, and FIG. 2 illustrates an instrument remote control system using Zigbee communication. As shown, a plurality of measuring instruments (110A, ..., 110N) for outputting the input value as a Zigbee communication signal, and a Zigbee transceiver (120,130) for transmitting and receiving a Zigbee communication signal connected to the plurality of measuring instruments and output; And an arithmetic processing unit 140 for receiving, analyzing, and determining a data signal received through the Zigbee transceiver 130. Here, the arithmetic processing unit 140 controls the display device 143, the input device 145, the memory 144, and the RF receiver 142 in addition to the control unit 141 for analyzing and determining the received data signal. The message exchange protocol for receiving a command and status information for executing the instruments 110A, ..., 110N may be applied to a general Zigbee communication protocol.

However, when the instrument control system using the wireless communication described above controls the instrument using a specific frequency band, for example, harmonic components affect the frequency and thus cannot receive a signal received due to frequency interference or the like. Or there is a problem that is difficult to measure accurately. In addition, when the infrared wireless communication method is used to solve this problem, the communication distance for remote control is shortened, and there is a problem in that the transceivers must be positioned to face each other even within the communication distance.

Thus, embodiments of the present invention, when one or more instruments transmits the input signal detected through the sensor to the remote controller using a predetermined specific radio frequency band to find a frequency band that does not interfere with the frequency band to provide a control signal The purpose of the present invention is to provide an instrument remote control system using wireless communication implemented to enable remote control and more accurate measurement of the instrument.

According to an aspect of the present invention, there is provided a meter remote control system using wireless communication, including: a meter for outputting an input signal detected through one or more sensors as a first radio signal using a first predetermined frequency band; A remote controller for receiving and analyzing the first radio signal, converting a control signal for controlling the instrument into a second radio signal, and transmitting the second radio signal to the instrument; And a variable wireless communication module configured to detect a second frequency band that does not interfere with the first frequency band, and to transmit and receive the second wireless signal using the second frequency band.

In one embodiment, if the second frequency band does not exist, the variable wireless communication module switches the transmission time of the first radio signal and the transmission time of the second radio signal by switching the first radio signal and the first radio signal. And a time division controller for controlling the time division transmission and reception of two wireless signals.

In one embodiment, the time division controller turns off the wireless communication module while the meter detects the input signal and transmits the first wireless signal, and the remote controller turns the second wireless signal on. The wireless communication module is turned on during the transmission.

In one embodiment, the time division controller, a memory for temporarily storing the detected input signal; characterized in that it comprises a.

The time division controller may include a time division switch configured to switch the transmission / reception time of the first radio signal and the second radio signal to be automatically switched according to a time division control signal.

In one embodiment, the variable wireless communication module comprises: an antenna; A low noise amplifier for low noise amplifying and outputting the first radio signal or the second radio signal received through the antenna; A variable local signal generator for generating and outputting a local signal of a second frequency band which does not interfere with the predetermined first frequency band; A signal synthesizer for mixing the signal output from the low noise amplifier with a local signal of a second frequency band generated from the variable local signal generator; And a transceiver configured to transmit and receive the first radio signal using the first frequency band or to transmit and receive the second radio signal using the second frequency band.

The variable wireless communication module may further include a variable filter unit which filters a frequency component other than a predetermined frequency in a wireless signal output from the low noise amplifier.

In one embodiment, the variable wireless communication module, characterized in that provided in the measuring instrument and the remote controller, respectively.

In one embodiment, the variable wireless communication module is characterized in that each connected to a plurality of instruments or one variable wireless communication module is connected to a plurality of instruments.

According to the remote control system for measuring instruments using wireless communication according to the embodiments of the present invention, it is possible to monitor and control the status of the measuring instruments even at a remote location, the complicated configuration of the measuring equipment generated during data transmission via a wired cable, increase in cost, And distance problem in installation is solved.

In addition, according to the instrument remote control system using a wireless communication according to the embodiments of the present invention, by using a frequency different from the measured frequency to transmit or receive a radio signal or by applying a time division scheme to transmit and receive a radio signal to eliminate the interference of the signal More accurate measurement is possible.

1 is an exemplary view showing an interface between a computer and an instrument according to the prior art.
2 is an exemplary view showing a remote control system of the instrument using a conventional wireless communication.
3 is a diagram illustrating an instrument remote control system using a variable wireless communication device, in accordance with an embodiment of the invention.
4 is a block diagram showing a detailed configuration of a variable wireless communication device according to an embodiment of the present invention.

It is noted that the technical terms used herein are used only to describe specific embodiments and are not intended to limit the invention. It is also to be understood that the technical terms used herein are to be interpreted in a sense generally understood by a person skilled in the art to which the present invention belongs, Should not be construed to mean, or be interpreted in an excessively reduced sense.

Also, in this specification, terms such as “comprise” or “consisting of” should not be construed as necessarily including all of the various components or steps described in the specification, and some or some of them may be included. It is to be understood that the steps may not be included or may further include additional components or steps.

Hereinafter, with reference to the accompanying drawings will be described in more detail the instrument remote control system using wireless communication according to an embodiment of the present invention.

The instrument remote control system using wireless communication refers to a system in which one or more wireless instruments are connected to one remote controller (for example, a central processing unit or a PC) to transmit data measured by each wireless instrument to the remote controller. do.

The meter remote control system according to an embodiment of the present invention, a meter for outputting an input signal detected through one or more sensors as a first wireless signal using a predetermined first frequency band, and receives the first wireless signal And a remote controller converting a control signal for controlling the instrument into a second wireless signal and transmitting the second signal to the instrument. The measuring instrument remote control system is provided in the measuring instrument and the remote controller, respectively, to detect a second frequency band which does not interfere with the first frequency band, and uses the second frequency band to perform the second radio signal. It includes a variable wireless communication module for transmitting and receiving.

Here, if there is no second frequency band that does not interfere with the first frequency band, the transmission time of the first radio signal and the second radio signal is switched so that the first radio signal and the second radio signal are time-divisionally transmitted and received. Can be controlled.

3 illustrates an instrument remote control system using a variable wireless communication module, in accordance with an embodiment of the invention. As shown, the meter 110 and the remote controller 200 performs wireless communication through the variable wireless communication device 300 provided in each. Here, the meter 100 connected to the wireless communication device 300 may be one or multiple. In addition, there may be various wireless network standards that can be used for the variable wireless communication module. For example, a wireless LAN (IEEE 802.11x) standard, a Bluetooth standard, a Zigbee standard, and the like may be included.

4 is a block diagram showing a detailed configuration of a variable wireless communication module according to an embodiment of the present invention. The variable wireless communication module 300 may include an antenna 310, a low noise amplifier 320, a variable local signal generator 330, a variable filter 340, a time division controller 350, a signal synthesizer 360, and a transceiver ( 370).

Antenna 310 receives wireless signals from wirelessly connected instrument 110 and / or remote controller 200 or transmits wireless signals to instrument 110 and / or remote controller 200. The wireless signal may be an RF signal or an IF signal.

The low noise amplifier 320 low noise amplifies and outputs a wireless signal received through the antenna 310. That is, the low noise amplifier 320 receives a predetermined specific frequency component through the antenna 310 and amplifies low noise.

The variable local signal generator 330 generates and outputs a local signal of a frequency band (second frequency band) that does not cause interference with a predetermined frequency band (first frequency band). To this end, the variable local signal generator 330 changes a frequency search unit (not shown) for searching for a usable frequency band and a frequency band (eg, a Zigbee channel) that does not interfere with a predetermined frequency band at the searched frequency. And a control unit (not shown) for processing the control up to the conversion.

In addition, the variable local signal generator 330 may include a predetermined algorithm therein for searching for a frequency band (second frequency band) that does not interfere with a predetermined frequency band (first frequency band). Further, in the selection of the first frequency band, the algorithm may automatically search for a used frequency in a pre-assigned frequency band and select an arbitrary frequency through a random number function in order to prevent imbalance between frequencies.

In addition, the variable local signal generator 330 amplifies the radio signal received by the antenna 310 through the low noise amplifier 320 and filtered only a predetermined frequency band through the variable filter 340, The up- or down-converted frequency may be output by mixing with the generated local signal. Accordingly, transmission and reception of a radio signal without interference of the signal can be made.

The variable filter 340 filters frequency components other than a predetermined frequency in the wireless signal output from the low noise amplifier 320. For example, when the radio signal received from the antenna 310 and / or the low noise amplifier 320 is an RF frequency band, the external interference signal outside the RF transmission / reception band is filtered.

The signal synthesizer 360 mixes and outputs the wireless signal output from the antenna 310 or the low noise amplifier 320 with the local signal of the second frequency band generated from the variable local signal generator 330.

In addition, the transceiver 370 transmits and receives a first radio signal using a first frequency band or a second radio signal using a second frequency band. Here, the second frequency band uses a frequency in a range that does not interfere with the first frequency band.

If there is no second frequency band that does not interfere with the time division controller 350 first frequency band, the transmission time of the first wireless signal transmitted from the instrument 110 and the second radio transmitted from the remote controller 200 By switching the transmission time of the signal, the first radio signal and the second radio signal is controlled to be time-divisionally transmitted and received.

To this end, the time division controller 350 includes a memory 355 and a time division switch 358.

The memory 355 temporarily stores the input signal detected through the sensor. In addition, the time division switch 358 switches the transmission / reception time of the first radio signal and the second radio signal according to a time division control signal. The time division switch 358 is implemented with, for example, a transistor element so that the first radio signal is input to the remote controller 200 or the second radio signal is output from the remote controller 200 according to a predetermined time division control signal. can do. It is preferable to use the time division switch 358 having a low switch loss and a high degree of isolation.

Specifically, the time division controller 350 operates when it is unable to detect a second frequency band which does not cause frequency interference with a predetermined first frequency band. The time division controller 350 turns off the variable wireless communication module 300 while the instrument 110 detects an input signal and transmits a first wireless signal. On the other hand, while the remote controller 200 transmits a second radio signal (not using a second frequency band that does not interfere with the first frequency band), the wireless communication module is turned on.

The variable wireless communication module 300 according to the embodiment of the present invention is provided in the measuring instrument 110 and the remote controller 200, respectively. In addition, the variable wireless communication module 300 may be formed in a structure in which each of the plurality of measuring instruments 110 is connected, or one variable wireless communication module 300 may be formed in a structure in which the plurality of measuring instruments 110 is connected. Can be.

In addition, the variable wireless communication module 300, the first wireless signal received from the instrument 110 uses a first frequency band, the second wireless signal received from the remote controller 200 is a second frequency band. In use, even if the second wireless signal is fed back from the meter 110, it is filtered by the first frequency band and thus is not affected by the interference signal.

As described above, according to the meter remote control system using wireless communication according to an embodiment of the present invention, it is possible to monitor and control the state of the instruments even in a remote location, the complex configuration of the measurement equipment generated during data transmission via a wired cable In addition, cost increase, and installation distance problem are solved, and more accurate measurement without interference of signal is possible by transmitting / receiving wireless signal using frequency different from measurement frequency or transmitting / receiving wireless signal by time division method.

Furthermore, while the exemplary embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited only to such specific embodiments, and the present invention is not limited to the spirit and scope of the present invention. It may be modified, changed or improved in the form.

110-Instrument 200-Remote Controller (PC)
300-Variable Wireless Communication Module 310-Antenna
320-Low Noise Amplifier 330-Variable Local Signal Generator
340-Variable Filters 350-Time Division Controllers
355-Memory 358-Time Division Switch
360-Signal Synthesizer 370-Transceiver

Claims (9)

A plurality of instruments outputting an input signal detected through at least one sensor as a first wireless signal using a first predetermined frequency band;
A remote controller which receives and analyzes the first radio signal, converts a control signal for controlling the instrument into a second radio signal, and transmits it to the plurality of instruments; And
And a variable wireless communication module that detects a second frequency band that does not interfere with the first frequency band, and transmits and receives the second wireless signal using the second frequency band.
The variable wireless communication module,
If the second frequency band does not exist, a time division controller for switching the transmission time of the first radio signal and the transmission time of the second radio signal to control time division transmission and reception of the first radio signal and the second radio signal. Including,
The time division controller,
And a time division switch comprising a transistor element for switching the transmission / reception time of the first radio signal and the second radio signal to be automatically switched according to a time division control signal, wherein the first radio signal using the first frequency band is Characterized in that the second radio signal to be input to the remote controller or to use the second frequency band is output from the remote controller,
Instrument remote control system using wireless communication. delete The method of claim 1,
The time division controller,
The wireless communication module is turned off while the plurality of measuring instruments detect the input signal and transmit the first wireless signal.
Characterized in that the wireless communication module is turned on while the remote controller is transmitting the second wireless signal.
Instrument remote control system using wireless communication. The method of claim 1,
The time division controller,
And a memory for temporarily storing the detected input signal.
Instrument remote control system using wireless communication. delete The method of claim 1,
The variable wireless communication module,
antenna;
A low noise amplifier for low noise amplifying and outputting the first or second wireless signal received through the antenna;
A variable local signal generator for generating and outputting a local signal of a second frequency band which does not interfere with the first frequency band;
A signal synthesizer for mixing the signal output from the low noise amplifier with a local signal of a second frequency band generated from the variable local signal generator; And
And a transceiver configured to transmit and receive the first wireless signal using the first frequency band or to transmit and receive the second wireless signal using the second frequency band.
Instrument remote control system using wireless communication. The method according to claim 6,
The variable wireless communication module,
And a variable filter unit for filtering a frequency component other than a predetermined frequency from the signal output from the low noise amplifier.
Instrument remote control system using wireless communication. The method of claim 1,
The variable wireless communication module, characterized in that each of the plurality of measuring instruments and the remote controller,
Instrument remote control system using wireless communication. The method of claim 1,
The variable wireless communication module may be connected to each of the plurality of measuring instruments, or one variable wireless communication module may be connected to the plurality of measuring instruments.
Instrument remote control system using wireless communication.

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