KR101644973B1 - Non-powered wireless temperature sensor tracking system and method - Google Patents

Non-powered wireless temperature sensor tracking system and method Download PDF

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KR101644973B1
KR101644973B1 KR1020150041021A KR20150041021A KR101644973B1 KR 101644973 B1 KR101644973 B1 KR 101644973B1 KR 1020150041021 A KR1020150041021 A KR 1020150041021A KR 20150041021 A KR20150041021 A KR 20150041021A KR 101644973 B1 KR101644973 B1 KR 101644973B1
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information
sensor
rssi
rotation
data
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KR1020150041021A
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Korean (ko)
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KR20160075294A (en
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신진옥
조경환
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한국생산기술연구원
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/02—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
    • G01S3/14—Systems for determining direction or deviation from predetermined direction
    • G01S3/38—Systems for determining direction or deviation from predetermined direction using adjustment of real or effective orientation of directivity characteristic of an antenna or an antenna system to give a desired condition of signal derived from that antenna or antenna system, e.g. to give a maximum or minimum signal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/125—Means for positioning
    • H01Q1/1257—Means for positioning using the received signal strength

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  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)

Abstract

A plurality of RSSI information, which is reception intensity information at the time of receiving the sensing data sensed by the non-powered sensor, is filtered through the antenna of the sensor tracking system, and the amount of change in RSSI is calculated based on the plurality of filtered RSSI information. Estimates the direction of the non-powered sensor based on the calculated RSSI variation, estimates the distance to the non-powered sensor, calculates rotation information based on the estimated direction and distance of the non-powered sensor, operates the driving unit of the sensor tracking system, .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a non-powered wireless temperature sensor tracking system and method,

The present invention relates to a non-power wireless temperature sensor tracking system and method.

Non-power / wireless sensors using surface acoustic wave (SAW) technology have been developed and applied for various applications in various countries around the world. In a wireless sensor system based on SAW technology, when the RSSI (Received Signal Strength Indication) value measured by the sensor receiving board is remarkably small, the reliability of measured frequency data is poor.

That is, in a wireless sensor system based on SAW technology, the radiation pattern of the dipole antenna is affected. Therefore, when the radio temperature sensor is located in the direction of low radio wave intensity, the RSSI value is lowered and the reliability of the frequency data measured thereby is low.

Therefore, the present invention provides a tracking system and method of a wireless power sensor based on SAW technology that can guarantee the reliability of frequency data.

According to an aspect of the present invention, there is provided a system for tracking a non-powered sensor,

An antenna for receiving data sensed by the non-powered sensor; A receiving unit for receiving intensity information of the antenna received by the antenna; A controller for estimating distance information between the direction of the non-power source sensor and the non-power source sensor on the basis of the received strength information confirmed by the receiver, and generating rotation information based on the estimated information; And a driving unit that rotates the antenna toward the non-power-supply sensor based on the rotation information generated by the control unit.

The driving unit includes: an input signal line for receiving rotation information including rotation direction information and rotation speed information generated by the control unit; A motor for moving the input signal line to rotate at a speed corresponding to the rotation speed information in a direction corresponding to the rotation direction information based on the rotation information received by the input signal line; And a motor rotating part provided in the motor and rotated by the rotation direction and the rotation speed according to the movement of the motor to rotate the antenna.

Wherein the controller estimates the direction and distance of the non-powered sensor based on the calculated amount of change, and the received strength information includes at least one of RSSI Received Signal Strength Indication) information.

According to another aspect of the present invention, there is provided a method of tracking a non-powered sensor,

Confirming a plurality of pieces of RSSI information, which are received strength information when receiving the sensed data sensed by the non-powered sensor based on SAW (Surface Acoustic Wave) technology through the antenna of the sensor tracking system;

Filtering the plurality of checked RSSI information and calculating a change amount of RSSI based on the filtered plurality of RSSI information; Estimating a direction of the non-power source sensor based on the calculated RSSI variation amount, and estimating a distance to the non-power source sensor; And calculating rotational information based on a direction and a distance of the estimated non-powered sensor, and operating the driving unit of the sensor tracking system to rotate the antenna.

Wherein the step of estimating the distance to the sensor confirms that the rotation progression direction of the driving unit of the sensor tracking system is in the same direction as the non-power supply sensor when the calculated RSSI variation amount is equal to or greater than 0, If the computed RSSI change amount is smaller than 0, it can be confirmed that the direction of rotation of the driving unit is in the direction opposite to the non-power source sensor.

According to the present invention, the position of the single dipole antenna can be controlled so that the portion with a good reception sensitivity faces the sensor, thereby maintaining the data reliability.

FIG. 1 is an exemplary view illustrating a frequency error according to a position of a general non-power wireless temperature sensor.
2 is a structural view of a sensor tracking system according to an embodiment of the present invention.
3 is a structural view of a driving unit according to an embodiment of the present invention.
4 is a flowchart illustrating an operation of the sensor tracking method according to an embodiment of the present invention.
5 is a diagram illustrating efficiency of an antenna tracking system according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

Hereinafter, a non-power wireless thermal sensor tracking system according to an embodiment of the present invention will be described with reference to the drawings. Before describing an embodiment of the present invention, an example of a frequency error according to the position of a general non-power wireless temperature sensor will be described with reference to FIG.

FIG. 1 is an exemplary view illustrating a frequency error according to a position of a general non-power wireless temperature sensor.

As shown in FIG. 1, when the position of the non-power wireless temperature sensor is located in the weak signal direction, which is the direction of low propagation intensity, due to the radiation pattern of the dipole antenna, the RSSI value is low. This causes a frequency error and low reliability of the frequency data.

Therefore, in the embodiment of the present invention, a non-power wireless temperature sensor tracking system capable of maintaining the reliability of frequency data by moving the antenna in the direction of high RSSI value when the RSSI value is significantly reduced is proposed.

2 is a structural view of a sensor tracking system according to an embodiment of the present invention.

2, a sensor tracking system 100 for receiving and processing sensed data sensed by a non-powered sensor 200 according to an embodiment of the present invention includes an antenna 110, a receiver 120, a controller 130 And a driving unit 140. [

The antenna 110 receives the temperature data sensed by the non-powered sensor 200 based on the SAW technology. In the embodiment of the present invention, a single dipole antenna is exemplified as the antenna 110, and the non-powered sensor 200 senses the temperature data. However, the present invention is not limited thereto. The direction of the antenna 110 to the non-power source sensor 200 can be changed according to the rotation of the driving unit 140.

The receiving unit 120 confirms the RSSI data, which is the receiving strength when the non-powered sensor 200 transmits the temperature data to the antenna 110. And transmits the checked RSSI data to the control unit 130. [ The method by which the receiver 120 confirms the RSSI data and the information constituting the RSSI data are already known, and a detailed description thereof will be omitted in the embodiment of the present invention.

The control unit 130 calculates a change amount of the RSSI data based on the RSSI data received from the receiving unit 120. Here, the RSSI data already received is stored in the controller 130 continuously for a predetermined time. The direction of the non-powered sensor 200 is estimated using the calculated amount of RSSI data, and the distance between the sensorless tracking sensor 100 and the direction of the estimated non-powered sensor 200 is estimated.

Then, based on the estimated distance information, the rotation direction (clockwise or counterclockwise direction) of the antenna 110 and the rotation speed are determined, and rotation information including the determined rotation direction and rotation speed is generated and transmitted to the driving unit 140 . The function of the control unit 130 will be described later in detail.

The driving unit 140 causes the antenna 110 to rotate in the rotating direction based on the rotating direction information and the rotating speed information included in the rotating information of the antenna 110 generated by the controller 130.

Here, the structure of the driving unit 140 will be described with reference to FIG.

3 is a structural view of a driving unit according to an embodiment of the present invention.

3, the driving unit 140 includes an input signal line 141, a motor rotation unit 142, and a sub motor 143. As shown in FIG.

The input signal line 141 receives rotation information from the control unit 130.

The motor rotation part 142 is connected to the antenna 110 for movement of the motor 143 when the motor 143 to be described below is moved based on the rotation direction information and the rotation speed information included in the rotation information received by the input signal line 141, ). Here, the motor rotation unit 142 rotates clockwise or counterclockwise at a radius of 300 degrees.

The motor 143 moves the antenna 110 so that the direction of the antenna 110 can be rotated based on the rotation information received from the control unit 130 through the input signal line 141 provided on one side of the motor 143. The embodiment of the present invention is not limited to any one of the motors of various kinds.

On the other hand, a method for the antenna tracking system 100 shown in FIG. 2 to track the non-powered sensor 200 will be described with reference to FIG. 4, an operation flow for generating information provided to the driving unit 140 by the control unit 130 is mainly described.

4 is a flowchart illustrating an operation of the sensor tracking method according to an embodiment of the present invention.

As shown in FIG. 4, the receiver 120 receives the RSSI data at the time of receiving the sensing information of the non-powered sensor 200 received through the antenna 110. When receiving the RSSI data from the receiving unit 120 (S100), the controller 130 filters the received RSSI data (S110). The controller 130 filters the RSSI data using a low pass filter in filtering the RSSI data in step S110, and the filtered result is shown in Equation (1).

Figure 112015028899051-pat00001

Here, n denotes the order of the low-pass filter, and data [t] denotes RSSI data. If n is 2, the controller 130 filters the RSSI data (data [t]) received at this point of time and the RSSI data (data [t-1] received at this point of time) Data. If there is no RSSI data received before the received RSSI data, the RSSI data is not filtered.

The controller 130 calculates a change amount of the RSSI using the filtered RSSI data in step S110 (S120). The change amount of the RSSI is calculated by the difference between the filtered RSSI data at the first time point and the filtered RSSI data at the second time point. Here, the first time point occurs later than the second time point.

Figure 112015028899051-pat00002

After calculating the amount of change of the RSSI in step S120, the controller 130 estimates the direction of the non-powered sensor 200 based on the calculated amount of RSSI change (S130). The non-power-source sensor direction estimates the position of the non-powered sensor 200 according to the increase / decrease of the RSSI. That is, when the variation calculated in step S120 is equal to or greater than 0, it is determined that the direction of rotation of the driving unit 140 is the same as the direction of the non-power source sensor 200. If the calculated variation is less than 0, It is determined that the direction of rotation of the battery 140 is different from the direction of the non-power source sensor.

If the sensor direction is estimated in step S130, the controller 130 calculates a distance between the non-powered sensor 200 and the antenna tracking system 100 (S140). Here, the distance between the non-powered sensor 200 and the antenna tracking system 100 is calculated by comparing the target RSSI value with the current RSSI value.

Figure 112015028899051-pat00003

Here, α is not limited to any one of constants, and RSSI_goal means a lower threshold value that allows the non-powered sensor 200 to stably receive data with a target RSSI value. The target RSSI value may vary depending on the system design and is not limited to any one number.

As described above, when the distance to the sensor is calculated, the controller 130 inputs the distance to the driving unit 140 based on the distance between the direction of the non-powered sensor 200 estimated in step S120 and the distance from the non-powered sensor 200 calculated in step S130 Calculate the input value. Here, the input value means rotation information including rotation direction information and rotation speed information.

That is, if the controller 130 is in the same direction as the non-powered sensor 200 in step S120, the controller 130 determines to rotate in the clockwise direction as an example. If it is predicted that the direction of the non-power source sensor 200 and the driving unit are in different directions, an example will be described in which it is determined to rotate counterclockwise.

At the same time, the control unit 130 calculates the speed of the driving unit 140 based on the distance from the non-powered sensor 200 calculated in step S130. The velocity is calculated using the following equation (4).

Figure 112015028899051-pat00004

Here,? Is a constant value, and is not limited to any one.

That is, the control unit 130 causes the antenna to rotate with the non-power source sensor 200 at a higher speed as the distance between the non-power source sensor and the antenna tracking system 100 increases. Here, the rotation angle of the antenna rotates at an angle set by the motor of the driving unit 140.

When the rotation direction and the rotation speed are determined as described above, the controller 130 generates the rotation direction and the rotation speed determined as rotation information and transmits the rotation information to the driving unit 140 (S150). The driving unit 140 operates the motor 143 based on the rotation information received in step S150 and the antenna 110 provided at the upper end of the motor rotation unit 142 moves the motor 143 and the motor rotation unit 142 The non-power source sensor 200 is tracked and moved.

As described above, the direction and distance of the non-powered sensor 200 are estimated based on the RSSI value, and the reliability of the data can be improved by correcting the position of the antenna based on the estimated direction and distance. The efficiency of the antenna tracking system 100 according to an embodiment of the present invention will be described with reference to FIG.

5 is a diagram illustrating efficiency of an antenna tracking system according to an embodiment of the present invention.

As shown in FIG. 5, the RSSI is increased by rotating the antenna actively in a large direction when the RSSI becomes smaller, as shown in FIG. Thereby allowing the reliability of the frequency data to be maintained.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (9)

A system for tracking a non-powered sensor,
An antenna for receiving data sensed by the non-powered sensor;
A receiving unit for receiving intensity information of the antenna received by the antenna;
A controller for estimating distance information between the direction of the non-power source sensor and the non-power source sensor on the basis of the received strength information confirmed by the receiver, and generating rotation information based on the estimated information; And
And a controller for controlling the rotation of the antenna based on the rotation information generated by the controller,
Lt; / RTI >
Wherein the distance information is a value estimated from a value for the target received strength information and a lower limit threshold that allows the data to be stably received from the non-powered sensor. The method according to claim 1,
The driving unit includes:
An input signal line for receiving rotation information including rotation direction information and rotation speed information generated by the control unit;
A motor for moving the input signal line to rotate at a speed corresponding to the rotation speed information in a direction corresponding to the rotation direction information based on the rotation information received by the input signal line; And
A motor rotation part provided in the motor for rotating the antenna in the rotation direction and the rotation speed in accordance with the movement of the motor,
The sensor tracking system comprising: The method according to claim 1,
Wherein,
Calculating a variation amount of reception intensity based on the filtered reception intensity information, estimating a direction and a distance of the non-power source sensor based on the calculated variation amount,
Wherein the reception intensity information is RSSI (Received Signal Strength Indication) information. The method of claim 3,
Wherein the non-power source sensor is a non-power wireless temperature sensor based on SAW (Surface Acoustic Wave) technology. A method for a sensor tracking system to track a non-powered sensor,
Confirming a plurality of pieces of RSSI information, which are received strength information when receiving the sensed data sensed by the non-powered sensor based on SAW (Surface Acoustic Wave) technology through the antenna of the sensor tracking system;
Filtering the plurality of checked RSSI information and calculating a change amount of RSSI based on the filtered plurality of RSSI information;
Estimating a direction of the non-power source sensor based on the calculated RSSI variation amount, and estimating a distance to the non-power source sensor; And
Calculating rotation information based on the direction and distance of the estimated non-power source sensor, and operating the driving unit of the sensor tracking system to rotate the antenna
/ RTI >
Wherein the step of estimating the distance to the non-
Estimates the distance to the non-powered sensor based on the difference between RSSI_goal and data_filter [t]
Wherein the RSSI_goal is a lower limit threshold value for stably receiving data from the non-power source sensor at a target RSSI value, and the data_filter [t] is filtered RSSI information at a first time point. 6. The method of claim 5,
The step of calculating the change amount of the RSSI may include:
data_difference = data_filter [t] - data_filter [t-1]
Here, the data_filter [t-1] is the filtered RSSI information at the second time point,
Wherein the second time point is temporally ahead of the first point in time. 6. The method of claim 5,
Wherein the step of estimating the distance to the sensor comprises:
When the calculated RSSI change amount is equal to or greater than 0, it is confirmed that the direction of rotation of the driving unit of the sensor tracking system is in the same direction as the non-power source sensor,
And if the calculated RSSI variation amount is less than 0, confirms that the rotation progression direction of the driving unit is in a direction opposite to the non-power source sensor. delete 6. The method of claim 5,
Wherein the rotation information includes a rotation direction and a rotation speed,
Wherein the rotational speed is determined by multiplying the distance from the non-power source sensor by an arbitrary constant value.
KR1020150041021A 2014-12-19 2015-03-24 Non-powered wireless temperature sensor tracking system and method KR101644973B1 (en)

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KR100574881B1 (en) * 2004-03-11 2006-04-27 주식회사 에이스테크놀로지 Apparatus for controlling a vehicle antenna and method thereof
KR101371419B1 (en) * 2013-12-27 2014-03-07 (주)서전기전 Temperature sensing system using surface acoustic wave temperature sensor

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KR100882351B1 (en) * 2007-03-14 2009-02-12 한국전자통신연구원 Apparatus and Method for tracing position and direction of radio frequency transceiver

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100574881B1 (en) * 2004-03-11 2006-04-27 주식회사 에이스테크놀로지 Apparatus for controlling a vehicle antenna and method thereof
KR101371419B1 (en) * 2013-12-27 2014-03-07 (주)서전기전 Temperature sensing system using surface acoustic wave temperature sensor

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