KR101348928B1 - Motion detector with frequency-dependent detection zone variation and control method thereof - Google Patents

Abstract

The present invention relates to a frequency-dependent boundary film variable motion detector and a control method thereof. The frequency-dependent boundary film variable motion detector includes: a pulse mode voltage controlled oscillator; a pulse generator for driving the pulse mode voltage controlled oscillator; a pulse width controller for controlling pulse width of the pulse generator; a frequency-dependent group delay transmission line for group-delaying an oscillation signal of the pulse mode voltage controlled oscillator as much as delay time corresponding to an established motion sensing distance and then providing the delayed oscillation signal to a receiver; and a mixer which is connected to the frequency-dependent group delay transmission line, and mixes a receiving signal received from a receiving antenna and the oscillation signal of the pulse mode oscillator delayed as much as the delay time and then provides the mixed signal. The frequency-dependent boundary film variable motion detector prepares configuration of forming a boundary film at a motion sensing distance corresponding to the delay time. Boundary monitoring can performed always, by assuring free motion inside and outside the boundary film, by using the frequency-dependent boundary film variable motion detector of the present invention. [Reference numerals] (AA) Sensing area

Description

Variable Motion Detection with Frequency-Dependent Detection Zone Variation and Control Method

The present invention relates to a motion sensor installed in an intrusion detection security environment and a control method thereof. In particular, the present invention relates to a frequency-dependent type for forming a barrier at a predetermined distance from a transmitter of a motion detector and detecting a motion of an object crossing the barrier. The present invention relates to a boundary film variable motion sensor and a control method thereof.

In addition, the present invention relates to a motion sensor and a control method capable of tracking the detected motion by changing the position of the boundary membrane through a frequency change after motion is detected as necessary.

In general, a motion detector that detects an object's movement is commonly used as a magnetic detector, an infrared detector, a hot wire detector, an ultrasonic detector, a microwave detector, and the like, and an appropriate type of motion detector is used according to an environmental condition in which a security system is installed.

The hot wire detector detects the difference and change in heat radiated from the surroundings and converts it into an electrical signal, and the ultrasonic detector transmits a single frequency pulse in the 40 ~ 250 KHz band which cannot be heard by the human ear. It then detects the same frequency signal reflected from the object and calculates the presence and distance of the object.

In addition, the microwave detector detects the reflected wave of the signal after transmitting the microwave, and the Doppler principle that the frequency of the reflected wave changes in proportion to its speed when the reflector of the microwave nears or moves away from the transmitter. Detect it.

An example of such a technique is disclosed in the following literature and the like.

For example, Patent Literature 1 below includes a motion sensor unit for detecting a movement in a crime prevention area when the security system is in operation and outputting a first motion detection signal, and receiving a radio signal in advance when the security system is in operation. A wireless receiver for outputting a second detection signal according to a result of comparing the code, and a signal detector for outputting an alarm signal to the security system central processing unit when both signals are alarm signals by combining the signals of the detection sensor unit and the wireless receiver unit And an operation unit configured to perform the security system security mode set or reset.

In addition, Patent Document 2 discloses that the object direction determining unit determines the first and second angles according to spherical coordinates from the camera module unit to the object, and the intrusion determining unit determines the first and second angles with respect to the monitoring area. Intrusion to determine whether it is within the set angle range, and if it is determined that the first and second angles belong to the preset angle range, the intrusion to determine whether the distance measured by the distance measuring unit belongs to the preset distance range A monitoring device is disclosed.

Republic of Korea Patent Publication No. 2000-0014633 (published on March 15, 2000) Republic of Korea Patent Publication No. 2010-0100388 (published Sep. 15, 2010)

 Samer Abielmona et al., Experimental Demonstration and Characterization of a Tunable CRLH Delay Line System for Impulse / Continuous Wave, IEEE Microwave and Wireless Components Letters, vol. 17, no. 12, pp. 864-866

However, in the conventional technology as described above, there is a problem that only the intrusion of the outside in the room is detected and all activities in the room cannot be normally performed because no movement is allowed in the detection area.

In addition, the motion detector including a conventional infrared detector is installed to be exposed to the outside of the building in order to detect the outside intruder to avoid the intruder and affected by the external environmental conditions, the detection performance is degraded, there was an aesthetic problem. .

An object of the present invention is to solve the problems described above, by applying a delay time corresponding to a specific distance to the signal input to the receiver, a frequency dependent type that can form a boundary film at a position away from the transmitter The present invention provides a boundary film variable motion sensor and a control method thereof.

Another object of the present invention is to further include a pulse width controller, to provide a frequency-dependent boundary film variable motion sensor and a control method for varying the thickness of the boundary film, that is, the motion detection interval.

Another object of the present invention is to use a CRLH (Composite Right / Left-Handed) transmission line, and use a voltage controlled oscillator (Voltae Controlled Oscillator, VCO) to use the group delay time of the transmission line having a different value according to frequency. The present invention provides a frequency dependent boundary film variable motion detector and a control method for controlling the position of the boundary film from a transmitter by having a different delay time when transmitting a transmission signal to a receiver by varying the frequency of the signal.

Another object of the present invention is to provide a frequency-dependent boundary membrane variable motion detector and a control method thereof capable of tracking the position of a motion detected by the motion sensor over time by changing the position of the boundary film according to the variable frequency.

In order to achieve the above object, an operation sensor according to the present invention is an operation sensor for varying a boundary film depending on a frequency, and includes a pulse mode voltage controlled oscillator, a pulse generator for driving the pulse mode voltage controlled oscillator, and a pulse width of the pulse generator. A pulse width controller for adjusting the frequency-dependent group delay transmission line and a frequency dependent group delay transmission line for providing the receiver by group delaying the oscillation signal of the pulse mode voltage controlled oscillator by a delay time corresponding to a set motion sensing distance. And a mixer for mixing and providing the received signal received from the receiving antenna and the oscillation signal of the pulse mode oscillator delayed by the delay time, and forming a boundary film at a motion detection distance corresponding to the delay time.

In the motion sensor according to the present invention, the pulse width of the oscillation signal defines the thickness of the boundary film.

In addition, in the motion sensor according to the present invention, it is connected to the frequency-dependent group delay transmission line, further comprising a control voltage unit for varying the frequency of the voltage controlled oscillator to control the delay time corresponding to the motion detection distance It features.

In addition, the motion sensor according to the present invention is connected to the mixer, characterized in that it further comprises an integrator for detecting the motion detection signal.

In addition, the motion sensor according to the present invention is connected to the integrator, characterized in that it further comprises a sensing path tracker for adjusting the frequency of the voltage controlled oscillator to track the movement of the motion detection signal.

In addition, the control method of the motion sensor according to the present invention to achieve the above object is a control method of the motion sensor for varying the boundary film depending on the frequency, the delay time corresponding to the oscillation signal of the pulse mode voltage controlled oscillator corresponding to the set motion detection distance Providing a receiver with a group delay, and being connected to the frequency dependent group delay transmission line, mixing a reception signal received from a reception antenna and an oscillation signal of the pulse mode oscillator delayed by the delay time; And forming a boundary film at a corresponding motion detection distance.

As described above, according to the frequency-dependent boundary film variable motion sensor and the control method according to the present invention, by applying a delay time corresponding to a specific distance to the signal input to the receiver, the boundary film at a position away from the transmitter It is possible to provide a motion detector that can be formed, and to ensure free movement inside and outside on the basis of this boundary film, the effect that the boundary monitoring can be performed at all times is obtained.

In addition, according to the frequency-dependent boundary membrane variable motion detector and the control method thereof according to the present invention, since the boundary membrane can be formed at a predetermined distance from the transmitter and the movement of the inside of the boundary membrane can be allowed, the motion detector is applied to the ceiling and the wall of the building. The effect that it can install by hiding is also acquired.

In addition, by further including a pulse width controller, in consideration of the installation purpose and the installation space of the motion sensor, there is an effect that can vary the thickness of the boundary film, that is, the motion detection section.

In addition, by using a transmission line having a group delay characteristic according to the frequency (in the present invention uses a Composite Right / Left-Handed transmission line as an embodiment) and further includes a control voltage for controlling the oscillation frequency of the voltage controlled oscillator, According to the boundary monitoring situation, it is possible to variably control the formation distance of the boundary film. This method is different from the conventional method in which the delay time of the line is changed by applying a voltage directly to the transmission line composed of diodes to change the position of the boundary layer. In the conventional method, a plurality of diodes are used for the group delay variable transmission line. The difference in the loss of the transmission line occurs according to the group delay time, but the present invention can effectively avoid this.

In addition, by further including a path to be detected path controller and a pulse width controller, after confirming the first detection target crossing the boundary membrane, the position of the boundary membrane in a direction close to or away from the detector, or by adjusting the thickness of the boundary membrane, There is an effect that can track the movement of the.

In addition, since the circuit configuration is simple, it is easy to miniaturize the motion detector, and there is an effect of securing price competitiveness.

1 is a block diagram showing an embodiment of a frequency dependent boundary film variable motion detector according to the present invention and a conceptual diagram of a motion detection unit.
2 is a diagram showing signals output from respective components of the frequency dependent boundary film variable motion detector according to the present invention;
3 is a view showing a variety of signals input to the receiver of the frequency dependent boundary film variable motion detector according to the present invention.
4 is a view for explaining a signal detected by the boundary membrane of the frequency-dependent boundary membrane variable motion sensor according to the present invention.
5 shows an equivalent model or implementation form of a frequency dependent group delay transmission line.
FIG. 6 is a diagram illustrating group delay characteristics of a pulsed mode microwave signal passing through a frequency dependent group delay transmission line, and shows a result of decreasing group delay as frequency increases. FIG.

These and other objects and novel features of the present invention will become more apparent from the description of the present specification and the accompanying drawings.

Hereinafter, a detailed description for implementing the frequency dependent boundary film variable motion detector according to the present invention will be described.

1 is a block diagram showing an embodiment of a frequency-dependent boundary film variable motion sensor according to the present invention and a conceptual diagram of the motion detection unit, Figure 2 is a signal output from each configuration of the frequency-dependent boundary film variable motion detector according to the present invention 3 is a diagram illustrating various signals input to a receiver of a frequency dependent boundary film variable motion detector according to the present invention.

As shown in FIG. 1, the frequency dependent boundary film variable motion detector according to the present invention controls the pulse width controller 10, the pulse generator 20, the pulse mode voltage controlled oscillator 30, and the frequency variation of the oscillation signal. Control voltage unit 40, transmission antenna 50, frequency dependent group delay (CRLH) having a delay line different according to the frequency (CRLH: Composite Right / Left-Handed) transmission line 60, receiving antenna 70, mixer ( 80), an integrator 90 and a path tracker 100 for path tracking of the sensing object.

The pulse mode voltage controlled oscillator 30 is driven by a pulse signal generated by the pulse generator 20, and the signal output from the pulse mode voltage controlled oscillator 30 is externally transmitted through the transmission antenna 50. In this case, the first signal transmitted is the same as the first signal ① of FIG. 2.

In this case, as shown in FIG. 2, the first signal ① has a pulse width of Δτ. The pulse width controller 10 according to the present invention is connected to the pulse generator 20 to obtain a pulse width Δτ. It plays a role of variable control.

Pulse width variable control of the pulse width controller 10 will be described in detail later.

The first signal ① transmitted to the outside through the transmission antenna 50 is reflected by the reflector, and is received as the second signal ② of FIG. 2 through the reception antenna 70, wherein the second signal ② is delayed. The signals are received at different time zones according to the degree of time τ ₁ , τ ₂ , and the like, and are input to the mixer 80.

In addition, the signal output from the pulse mode voltage controlled oscillator 30 is a third signal ③ converted into a delay time corresponding to the frequency of the oscillation signal in the frequency dependent group delay transmission line 60 to the mixer 80. Is entered.

In the present invention, the transmission line 60 has a group delay characteristic that varies according to the frequency of the oscillation signal, and provides the third signal ③ by varying the delay time τ corresponding to the motion detection distance R. In the embodiment of the present invention, the delay time τ is controlled by varying the frequency of the oscillation signal by using the control voltage from the control voltage unit 40 input to the voltage controlled oscillator 30.

By varying the delay time τ, the position where the detection width ΔR of the detection region of the boundary film of the frequency dependent boundary film variable motion detector according to the present invention is formed may be varied.

The mixer 80 serves to mix and provide the second signal ② and the third signal ③, and in the present invention, the fourth signal ④ output through the mixer 80 is due to group delay characteristics. The detection width ΔR of the detection area of the boundary film may be formed at a specific distance, that is, the operation detection distance R corresponding to the delay time τ from the transmitter.

In detail, the signal (a) shown in FIG. 3 represents a signal input by being delayed by the delay time τ by the transmission line 60, and the delay time τ is represented by the boundary film of FIG. 1. The position where the detection width ΔR of the detection area is formed, that is, the motion detection distance R becomes a variable, and the delay time τ is the frequency and frequency of the voltage controlled oscillator 30 shown in FIG. 1. It is variably controlled by the combination of the dependent group delay transmission lines 60.

That is, since the position of the boundary layer can be controlled by varying the delay time τ through the frequency of the voltage controlled oscillator 30, the boundary is considered based on the position of the transmission antenna 50 in consideration of the monitoring area. It is possible to shift the position of the detection width ΔR of the detection area of the film.

The position of the boundary, that is, the motion detection distance R, according to the present invention is calculated by Equation 1 below.

[Equation 1]

R = (c × τ / 2)

Where R is the sensing distance, c is the speed of light in vacuum, and τ is the delay time.

In the present invention, the pulse width Δτ is a variable that varies the detection width ΔR of the detection area of the boundary film, and the pulse width Δτ is a pulse width controller 10 connected to the pulse generator 20. Variable control.

As such, by varying the pulse width Δτ through the pulse width controller 10, it is easy to control the detection width ΔR of the boundary layer, and to adjust the detection width ΔR of the boundary layer according to boundary conditions and boundary purposes. It can be decided.

As shown in (b) of FIG. 3, a signal for detecting an object at a distance corresponding to a delay time of τ ₁ is input to a receiver of the motion detector, or (d) at a distance corresponding to a delay time of τ ₂ . When a signal for sensing an object is input, such a delay time does not correspond to a distance R corresponding to the detection width ΔR, so that the detection signal is not output.

However, (c) is a signal reflected by an object at a distance corresponding to τ ₂ and τ ₁ and represents a distance equal to the delay time of τ, which corresponds to the signal of (a), so that the mixer 80 Through the low frequency signal will be generated.

In addition, the motion detection signal detected through the integrator 90 shown in FIG. 1 is transferred to the path tracking object 100 to be sensed and used for the path tracking device of the detection target.

The sensing target path tracker 100 may be simply configured as a signal processing unit and a digital control unit, and thus is not described separately. The sensing target path tracker 100 tracks the movement of the motion detection signal. After checking the first sensing target across the barrier, the position of the barrier is moved, or the thickness of the barrier is adjusted to adjust the movement of the sensing target. To track.

FIG. 4 is a view illustrating a concept of a signal detected by a frequency dependent boundary membrane variable motion sensor according to the present invention, wherein an object motion signal received from the inside R _in of the boundary membrane and outside of the boundary membrane R _out . The received object motion signal is excluded from the detection object, and only the object motion signal passing through the boundary layer (R _on ) is detected as the intrusion object signal.

That is, the frequency-dependent boundary membrane variable motion detector according to the present invention forms a boundary membrane at a specific motion detection distance R based on the transmission antenna 50 and permits movement of the boundary membrane inside and outside, thereby monitoring the intruder at all times. There is an advantage in that it is possible, and there is an advantage in that it can control the portion of the sensing area in the entire activity space.

FIG. 5 shows an equivalent model of a unit cell of the frequency dependent group delay CRLH transmission line 60 used in the frequency dependent boundary film variable motion detector according to the present invention, and the series inductor L _R 'is usually implemented as a microstrip transmission line. In this case, a plurality of cells may be connected in series according to the group delay time.

FIG. 6 illustrates a change in delay time according to the frequency of the group delay transmission line 60 implemented in FIG. 5 through circuit simulation and experimental results, and is mentioned in the non-patent literature of the aforementioned prior art document. The change in the group delay time according to the frequency of the CRLH transmission line 60 may be a general characteristic observed in various documents. In the present invention, the general group delay time characteristic of the CRLH transmission line 60 is utilized in the construction of the motion detector.

As described above, the frequency dependent boundary film variable motion detector according to the present invention applies the oscillation signal of the voltage controlled oscillator 30 to the frequency dependent group delay transmission line 60 without using a plurality of antennas and varies the frequency of the oscillation signal. By controlling the group delay time, the boundary film can be easily moved, and by controlling the pulse width of the voltage controlled oscillator 30, there is an advantage that the thickness of the boundary film can be adjusted.

As described above, when applying the frequency-dependent boundary membrane variable motion sensor according to the present invention, by allowing movement in the boundary membrane, it is possible to operate the security system normally even if there is a person in the room, and intrusion from the outside It is effective in detecting bays and can be concealed in indoor ceilings or in facilities, preventing the possibility of harming aesthetics.

In addition, as a simplified circuit can be implemented, it can be miniaturized compared to a conventional motion detector, and in addition, there is an advantage of securing a price competitiveness due to the production of the motion detector.

Furthermore, the frequency-dependent boundary membrane variable motion detector according to the present invention can be widely applied to security systems such as automatic door control, lighting control according to the presence or absence of building access, pedestrian detection of railroad tracks or crossings, and intruder detection in military border areas.

Although the present invention has been described in detail with reference to the above embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

By using the frequency dependent boundary film variable motion detector according to the present invention, only intrusion from the outside can be detected.

10 pulse width controller 20 pulse generator
30: pulse mode voltage controlled oscillator 40: control voltage unit
50: transmission antenna 60: transmission line
70: reception antenna 80: mixer
90: integrator 100: path tracker

Claims (7)

As a motion sensor that varies the boundary film depending on the frequency,
Pulse mode voltage controlled oscillator,
A pulse generator for driving the pulse mode voltage controlled oscillator;
A pulse width controller for adjusting a pulse width of the pulse generator,
A frequency-dependent group delay transmission line for group-delaying the oscillation signal of the pulse mode voltage controlled oscillator by a delay time corresponding to a set motion sensing distance and providing the signal to a receiver;
It is connected to the frequency-dependent group delay transmission line, and includes a mixer for mixing and providing a signal received from the receiving antenna and the oscillation signal of the pulse mode oscillator delayed by the delay time,
And a boundary film is formed at a motion detection distance corresponding to the delay time. The method of claim 1,
The pulse width of the oscillation signal defines the thickness of the boundary film. 3. The method of claim 2,
And a control voltage unit connected to the frequency dependent group delay transmission line and configured to vary a frequency of a voltage controlled oscillator to control a delay time corresponding to the motion detection distance. 3. The method of claim 2,
And an integrator connected to the mixer to detect a motion detection signal. 5. The method of claim 4,
And a path to be detected path connected to the integrator to adjust a frequency of the voltage controlled oscillator to track the motion of the motion detection signal. As a control method of a motion sensor which varies a boundary film depending on frequency,
Providing group-delayed oscillation signals of the pulse mode voltage controlled oscillator by a delay time corresponding to a set motion sensing distance to a receiver;
Connecting to the frequency dependent group delay transmission line and mixing a received signal received from a receiving antenna and an oscillation signal of the pulse mode oscillator delayed by the delay time;
And forming a boundary film at a motion detection distance corresponding to the delay time. The method according to claim 6,
The pulse width of the oscillation signal defines the thickness of the boundary film.

Images