KR20050048809A - Microwave detector having anti-masking circuit for crime prevention - Google Patents

Abstract

A security microwave detector with a shield detection circuit (Anti-Masking circuit) is disclosed. The present invention provides a sensor circuit unit for detecting the presence of an object through the emitted microwave frequency and the intermediate frequency to output a weak voltage level, and a shield detecting circuit unit for processing a signal to check whether the object is in a mask state by checking the voltage level; And an object signal processing circuit unit configured to determine the size and the moving speed of the object by detecting a volume of the object by receiving a low frequency voltage from the sensor circuit unit or by applying a mask determination result from the shield detection circuit unit. . According to the present invention, not only the size of the object and the moving speed of the object for intrusion can be confirmed, but also the shielding of the microwave detector can be confirmed, thereby making it possible to construct a more reliable security system.

Description

Microwave detector with built-in shield detection circuit

The present invention relates to an anti-theft microwave detector with a shield detection circuit for detecting the presence or absence of a shield to disable the function of the anti-theft microwave detector, in particular a mask for the detector by checking the signal strength of the reflected wave using the Doppler effect The present invention relates to an anti-theft microwave detector with a shield detection circuit (Anti-Masking circuit) that can check and alert the shielding.

Nowadays, various methods have been sought to provide home residents with convenient functions by building home automation on existing buildings as well as new buildings. In connection with this, various security systems are also introduced for security purposes inside and outside the building. This is a preventive measure to protect the life and property of yourself, your family and colleagues. This security system is widely applied to apartments, private houses, shopping malls, buildings, and security systems such as individual household security systems, disaster prevention systems, entrance control systems, parking management systems, home automation systems, and CCTV monitoring devices. The system is in use. Such a security system checks if an abnormality such as an external invasion occurs to the customer and dispatches police and self-moving vehicles to take an emergency response, or perform access control, time and attendance, and parking management. In addition, it also provides a video of the CCTV installed in the security area.

Infrared systems are widely used in these security systems. This infrared method detects this when the infrared beam is blocked. The detection area is within 10 [m] to 15 [m], and an automatic alarm function is possible. By the way, this infrared system has a limitation in accurately identifying the area of failure, and an alarm is also generated by a small animal other than an intruder or fallen leaves and paper that can block infrared rays, such as manpower and time due to dispatch in response to the alarm. Waste was incurred. In addition, only the state of intrusion within the sensing distance is detected, but the size of the object and the moving speed of the object can not be confirmed, there is a disadvantage that it is impossible to distinguish between the object intended to invade and the object not.

In order to compensate for this, the applicant has devised a "microwave detector" in the registered utility model No. 20-0304230 proposed a microwave detector that can determine the size and moving speed of the object, and can determine the intention of intrusion. By the way, the microwave detector is transmitted through almost most objects due to the use of microwaves, but in the case of an object that is not, it can be practically useless like the infrared method. In addition, when surrounding the microwave detector with a mask that can shield the microwave for the purpose of crime, there was a disadvantage that the security objective can no longer be performed.

Accordingly, an object of the present invention is to check the signal intensity of the reflected wave using the Doppler effect in consideration of the case surrounded by the mask for shielding the microwave, and the shield detection circuit that can check and alert whether the mask is shielded To provide a built-in security microwave detector.

In order to achieve the above object of the present invention, an anti-theft microwave detector with a shield detecting circuit includes: a sensor circuit unit for detecting presence of an object through a radiated microwave frequency and an intermediate frequency and outputting a weak voltage level; A shield detecting circuit unit which checks the voltage level and signals whether the object is in a mask state; And an object signal processing circuit unit configured to determine the size and the moving speed of the object by detecting a volume of the object by receiving a low frequency voltage from the sensor circuit unit or by applying a mask determination result from the shield detection circuit unit.

At this time, the sensor circuit unit, a high frequency oscillation unit for generating a high frequency; An amplifier for amplifying the oscillated high frequency; A transmission antenna for propagating the amplified high frequency to the air; A reception antenna which is formed integrally with the sensor circuit unit and receives the radio frequency reflected from the radio frequency or the object; A frequency synthesizer for synthesizing a signal reflected from the object and a high frequency wave propagated; And an intermediate frequency stage for outputting a signal by converting the frequency synthesized by the frequency synthesizer from the frequency of the intermediate band.

The shield detection circuit unit may further include: a signal strength filtering unit configured to calculate a voltage level using a resistor, and to allow the voltage level to be above the set voltage and to block the voltage level below the set voltage; A signal level adjusting unit for adjusting the level of the signal output from the signal strength filtering unit to a level that can be processed later; A weak signal amplifier for amplifying the signal output from the signal level adjusting unit; A signal converter converting the analog signal output from the weak signal amplifier into a digital signal; A shield signal processing unit for comparing and determining whether the digitally converted signal value falls within a predetermined upper limit value and a lower limit value; And a display unit and an alarm unit for displaying the digitally converted signal value or for alarming when the digitally converted signal value is not within an upper limit value and a lower limit value. Here, it is preferable to further connect the shield detection level setting unit to the shield signal processing unit so that the width setting of the upper limit value and the lower limit value can be adjusted.

The object signal processing circuit unit amplifies the weak signal transmitted from the sensor circuit unit or the shield detection circuit unit, adjusts the gain of the amplified signal, and adjusts the signal amplification and gain according to the control signal of the object signal processing unit described below. The controlled signal amplification and gain adjusting unit; A signal level adjusting unit for readjusting a gain adjusting signal level output from the signal amplifying and gain adjusting unit; A sensitivity signal level adjustment unit for adjusting and subdividing the sensitivity signal level according to the size and distance of the moving object; The control signal for controlling the alarm output, alarm operation, and sensitivity signal display by measuring the gain control signal level and the sensitivity signal level subdivided and output from the signal level adjusting unit and the sensitivity signal level adjusting unit by comparison with the detection signal of the sensor circuit unit. An object signal processor for outputting; And a signal indicator, an alarm, and an alarm output unit for outputting an alarm, generating an alarm sound, and displaying a signal level when the motion signal level of the object is greater than or equal to a preset sensitivity level according to the control signal of the object signal processor.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

1 is a conceptual diagram of a security microwave detector of the present invention. Referring to FIG. 1, the anti-theft microwave detector of the present invention is largely composed of a sensor circuit unit 1, a shield detecting circuit unit 2 and an object signal processing circuit unit 3.

The sensor circuit unit 1 detects the presence of an object by the microwave frequency and the intermediate frequency radiated from the security area by using the Doppler Principle.

The shield detecting circuit unit 2 primarily detects the presence or absence of a shield such as a mask that can surround the security-preventing microwave detector including the sensor circuit unit 1. To this end, a circuit for processing a signal reflected by the Doppler effect is configured, and whether the mask is primarily determined through this circuit.

The object signal processing circuit unit 3 first grasps whether the object is moving when it is determined that it is not a shield such as a mask after determining whether the mask is primarily performed. That is, the volume of the object is recognized and the moving speed of the object is determined by recognizing the volume of the object. This makes it possible to distinguish between objects that are intended to invade and objects that do not.

Such a security microwave detector can be easily installed on the wall or ceiling to be installed by using a bracket, and fixed by changing the installation direction by using a joint part connecting the security microwave detector and the bracket. You can.

2 is a control circuit block diagram of a security microwave detector according to an embodiment of the present invention. Referring to FIG. 2, first, the sensor circuit unit 1 is specifically composed of a microwave sensor module unit 1. As an example, the microwave sensor module unit 1 includes a high frequency oscillation unit for generating a high frequency wave, and the oscillation. An amplification unit for amplifying the high frequency, a transmission antenna for propagating the amplified high frequency to the air, and a reception unit for receiving a high frequency reflected by colliding with a high frequency wave or an object formed integrally in the microwave sensor module unit 1 And an antenna, a frequency synthesizer for synthesizing the signal reflected and the high frequency propagated by the object, and an intermediate frequency stage for converting the frequency synthesized from the frequency synthesizer into a frequency of an intermediate band and outputting a signal. .

As such, the microwave sensor module unit 1 detects a mask or a moving object by a radiated microwave frequency and an intermediate frequency in a secure area using a Doppler principle, and the frequency used is a micro The wave range is used, and the intermediate frequency is a frequency obtained by combining the emitted microwave frequency and the frequency reflected by the object, and the sensing distance of the target object is 1 to 30 [depending on the size and degree of the object to be moved. m].

The shield detecting circuit unit 2 is specifically, the signal strength filtering unit 21, the signal level adjusting unit 22, the weak signal amplifier 23, the signal converter 24 and the shield signal processing unit 25, the shield detection And a level setting section 26 and a shield alarm section 27.

The signal strength filtering unit 21 calculates a low frequency voltage level using a signal intensity output from the intermediate frequency terminal, for example, a resistor, to allow the signal strength to be above the set voltage and to cut off the voltage below the set voltage. To perform. The signal level adjusting unit 22 adjusts the level of the signal output from the signal strength filtering unit 21 to a later processable level. The weak signal amplifier 23 performs a function of amplifying the signal output from the signal level adjuster 22. The signal converter 24 performs a function of converting an analog signal output from the weak signal amplifier 23 into a digital signal. The shield signal processing unit 25 performs a function of comparing and determining whether the digitally converted signal value falls within a predetermined upper limit value and a lower limit value.

Here, the shield detection level setting unit 26 is connected to the shield signal processing unit 25 to adjust the width setting of the upper limit value and the lower limit value, and the shield detection level setting unit 26 does not transmit microwaves. It performs a function of presetting the reference value (width of the upper limit value and the lower limit value) to which the reflection signal strength value of the material cannot be compared. At this time, the setting of the signal level is subdivided into multiple stages, and the signal level according to the type of mask is also subdivided and adjusted. This can be obtained by making a database of experimental data obtained from the type and distance of the mask.

Meanwhile, the shield alarm unit 27 performs a shield alarm in response to a signal output from the shield signal processing unit 25. Like the alarm unit of the object signal processing circuit unit 3 shown in FIG. 2, the signal indicator 35, the alarm unit 36, and the alarm output unit 37 may be configured to perform a function of informing a user of a signal level, an alarm, and an alarm. It may be.

The object signal processing circuit section 3 includes a signal amplification and gain adjusting section 31, a signal level adjusting section 32, an object signal processing section 33, a sensitivity signal level setting section 34, a signal indicator 35, and an alarm ( 36) and an alarm output unit 37 is configured.

The signal amplification and gain adjusting unit 31 amplifies the weak signal transmitted from the microwave sensor module unit 1, adjusts the gain of the amplified signal, and controls the signal of the object signal processing unit 33. Signal amplification and gain adjustment are controlled accordingly. The signal level adjusting unit 32 performs a function of re-adjusting the gain adjusting signal level output from the signal amplifying and gain adjusting unit 31. The sensitivity signal level adjusting unit 32 adjusts and subdivids the sensitivity signal level according to the size and distance of the moving object. In this case, the adjustment of the sensitivity level is subdivided into multiple stages, and the sensitivity level may be readjusted according to the size and distance of the moving object. The object signal processing unit 33 is a signal signal of the microwave sensor module unit 1 based on the gain adjustment signal level and the sensitivity signal level respectively divided and output from the signal level adjusting unit 32 and the sensitivity signal level adjusting unit 32. And outputs a control signal for controlling the alarm output, alarm 36 operation, and sensitivity signal display in comparison with the measurement. The signal indicator 35, the alarm 36, and the alarm output unit 37 output an alarm when the motion signal level of the object is greater than or equal to a preset sensitivity level according to the control signal of the object signal processor 33, and generate an alarm sound. To generate a signal level.

In the present embodiment, since the signal output from the microwave sensor module unit 1 is simultaneously supplied to not only the shield detection circuit unit 2 but also the object signal processing circuit unit 3, parallel signal processing is performed, so that the shield detection circuit unit Signal processing of the object signal processing circuit section 3 by providing a delay element at the output terminal of the shield detection circuit section 2 to eliminate the gap between the signal processing time of (2) and the signal processing time of the object signal processing circuit section 3. It would be desirable to synchronize with time. In addition, although parallel signal processing is performed in this embodiment, it is well known that serial signal processing may be performed. That is, the signal strength filtering unit 21 may determine a mask if the low frequency voltage exceeds a set value, or otherwise determine a moving object, thereby implementing serial signal processing in which only one signal processing is performed (A). .

The operation and effect of the anti-theft microwave detector with the shield detection circuit of the present invention configured as described above will be described.

The local oscillator generates a high frequency in the band to emit high frequency from the microwave sensor module unit 1. At this time, divergence is obtained in which the vertical cross section has an elliptical shape or a circular shape by setting the vertical and horizontal angles. In this state, whether masking or object is detected in real time.

At this time, when the mask which microwaves cannot transmit for the purpose of crime is wrapped around the crime prevention microwave detector, the radiated high frequency is reflected on the mask and reentry is performed. This is due to the Doppler effect, the incident high frequency is synthesized with the emitted high frequency and passes through the intermediate frequency stage and finally output from the microwave sensor module unit (1). That is, the microwave sensor module 1 outputs a low frequency voltage at the final stage.

Since the low frequency voltage is a signal reflected at a relatively close distance, it has a relatively high voltage value. That is, the low frequency voltage passes the signal strength filtering unit 21 primarily so that the masking process is performed only when the voltage is equal to or greater than a preset voltage value. If it is determined that the signal input from the signal strength filtering unit 21 is not greater than the preset reference voltage value, the microwave sensor module unit 1 continues to perform the unique function or detects the detected signal in the object signal processing circuit unit. (3) to carry out the function. On the other hand, when it is determined that the signal input from the signal strength filtering unit 21 is greater than the preset reference voltage value, the signal level is adjusted in the following process. This is then adjusted to a level where signal processing is possible in the process. The weak signal is then amplified and then the amplified analog signal is converted into a digital signal.

Subsequently, the shield signal processing unit 25 receives a signal converted into a digital signal and compares the preset reference value. The preset reference value means a width of an upper limit value and a lower limit value as described above. That is, when there is no value converted into the digital signal between the upper limit value and the lower limit value, it is determined that a mask exists. This determines whether a shield alerts. On the other hand, the shielding alarm can be performed even when it is determined that the output is more than the set time or more than the set number of times within the reference value range. This shield alarm may be expressed in numerical values or in the form of an alarm or alarm.

Meanwhile, in the above process, sensitivity may be adjusted with respect to the reflected signal intensity value of the material that the microwave does not transmit, which is performed by the shield detection level setting unit 26. The mask detection sensitivity is changed according to the level control of the shield detection level setting unit 26, and the sensitivity can be slowed or adjusted sensitively. That is, the alarm processing can be performed in response to the signals present in this area by narrowing or widening the area of the upper limit value and the lower limit value.

On the other hand, if there is a value converted into the digital signal between the upper limit value and the lower limit value, the shield signal processing unit 25 to the object signal processing unit 33 to convey that it is not a shield such as a mask. In response, the object signal processing unit 33 processes the input signal to determine information about the moving object.

At this time, the signal output from the microwave sensor module unit 1 is simultaneously supplied to the object signal processing circuit unit 3 as well as the shield detection circuit unit 2 to perform signal processing on the object at the same time. That is, the signal output from the microwave sensor module unit 1 amplifies the weak signal transmitted from the signal amplification and gain adjusting unit 31, and adjusts the gain of the amplified signal. At this time, the signal amplification and gain adjustment are controlled under the control of the object signal processing unit 33 according to the adjustment of the sensitivity signal level setting unit 34. Thereafter, the amplified and gain-adjusted signal is readjusted by the gain adjustment signal level and transferred to the object signal processor 33.

Accordingly, the object signal processing unit 33 detects the microwave sensor module unit 1 based on the gain adjustment signal level and the sensitivity signal level which are respectively divided and output from the signal level adjusting unit 32 and the sensitivity signal level adjusting unit 32. The signal is measured and compared to generate a control signal for controlling the alarm output, alarm 36 operation, and sensitivity signal display, respectively.

In response to the control signal, the signal indicator 35, the alarm 36, and the alarm output unit 37 output an alarm when the object's motion signal level is equal to or higher than a preset sensitivity level, generate an alarm sound, and generate a signal level. Will be displayed.

Meanwhile, the sensitivity signal level adjusting unit 32 may adjust the sensitivity signal level according to the size and distance of the moving object. The adjustment of the sensitivity level is subdivided into multiple stages, and the sensitivity level is subdivided according to the size and distance of the moving object. Can be readjusted.

The above control is an example of clearly distinguishing whether or not a mask or an object, and the determination may be made as shown in the following table according to the result values of the shield detecting circuit unit 2 and the object signal processing circuit unit 3.

[table]

Shield Detection Circuit Part (2) Object signal processing circuit section (3) Remarks Operation X X Safety status X O Judging by moving object O X Judging by the mask shield O O Judging by a moving object

As shown in the above table, when neither the shield detection circuit unit 2 nor the object signal processing circuit unit 3 is operated, it is determined that the moving object or the mask shield is not detected, and thus, the shield detection circuit unit (2) does not operate and when the object signal processing circuit unit 3 operates, it is determined as a moving object to determine the size and speed of the moving object, and the shield detection circuit unit 2 operates and the object signal processing circuit unit 3 If it does not operate, it is determined as a mask shield, and when both the shield detection circuit unit 2 and the object signal processing circuit unit 3 operate, it is determined to be an adjacent moving object, and the size and speed of the moving object and a separate shielding time are determined. Understand the type of moving object.

The present invention is not limited to the above-described embodiments, and it will be apparent that many modifications are possible by those skilled in the art within the technical spirit of the present invention.

As described above, the anti-theft microwave detector with a shield detection circuit according to the present invention, not only can check the size and the moving speed of the object for intrusion, but also whether the microwave detector is shielded. It is possible to build a more reliable security system.

1 is a conceptual diagram of a security microwave detector of the present invention,

2 is a control circuit block diagram of a security microwave detector according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1: Sensor circuit part, microwave sensor module part

2: shield detection circuit

21: signal strength filtering unit 22: signal level adjusting unit

23: weak signal amplifier 24: signal converter

25: shield signal processing unit 26: shield detection level setting unit

27: shield alarm unit

3: object signal processing circuit

31: signal amplification and gain adjusting unit 32: signal level adjusting unit

33: object signal processor 34: sensitivity signal level setting unit

35: signal indicator 36: alarm

37: alarm output unit

Claims (5)

A sensor circuit unit for sensing the presence of an object through the emitted microwave frequency and the intermediate frequency and outputting a voltage level; A shield detecting circuit unit for checking whether the object is in a mask state by comparing and determining whether the voltage level falls within a predetermined upper limit value and a lower limit value by checking the voltage level; And An object signal processing circuit unit for detecting the size and moving speed of an object by detecting a volume of the object by receiving a low frequency voltage from the sensor circuit unit or a mask determination result from the shield detection circuit unit. Anti-theft microwave detector with a shield detection circuit, characterized in that consisting of. The method of claim 1, wherein the sensor circuit unit, A high frequency oscillator generating high frequency; An amplifier for amplifying the oscillated high frequency; A transmission antenna for propagating the amplified high frequency to the air; A reception antenna which is formed integrally with the sensor circuit unit and receives the radio frequency reflected from the radio frequency or the object; A frequency synthesizer for synthesizing a signal reflected from the object and a high frequency wave propagated; And An intermediate frequency stage outputting a signal by converting the frequency synthesized in the frequency synthesizer from the frequency of the intermediate band Security-proof microwave detector with a shield detection circuit, characterized in that consisting of. The method of claim 1 or 2, wherein the shield detecting circuit unit, A signal strength filtering unit for calculating a voltage level using a resistor and allowing the voltage level to be above the set voltage and blocking the voltage level below the set voltage; A signal level adjusting unit for adjusting the level of the signal output from the signal strength filtering unit to a level that can be processed later; A weak signal amplifier for amplifying the signal output from the signal level adjusting unit; A signal converter converting the analog signal output from the weak signal amplifier into a digital signal; A shield signal processing unit for comparing and determining whether the digitally converted signal value falls within a predetermined upper limit value and a lower limit value; And A display unit and an alarm unit for displaying the digitally converted signal value or for alarming when the digitally converted signal value is not within an upper limit value and a lower limit value Anti-theft microwave detector with a shield detection circuit, characterized in that consisting of. The anti-theft microwave detector with a shield detection circuit according to claim 3, further comprising a shield detection level setting unit further connected to the shield signal processing unit to adjust the width setting of the upper limit value and the lower limit value. The method of claim 1 or 2, wherein the object signal processing circuit unit, A signal amplification and gain adjustment unit for amplifying the weak signal transmitted from the sensor circuit unit or the shield detection circuit unit, adjusting the gain of the amplified signal, and controlling signal amplification and gain adjustment according to a control signal of an object signal processing unit described below; A signal level adjusting unit for readjusting a gain adjusting signal level output from the signal amplifying and gain adjusting unit; A sensitivity signal level adjustment unit for adjusting and subdividing the sensitivity signal level according to the size and distance of the moving object; The control signal for controlling the alarm output, alarm operation, and sensitivity signal display by measuring the gain control signal level and the sensitivity signal level subdivided and output from the signal level adjusting unit and the sensitivity signal level adjusting unit by comparison with the detection signal of the sensor circuit unit. An object signal processor for outputting; And A signal indicator, an alarm, and an alarm output unit for outputting an alarm, generating an alarm sound, and displaying a signal level when the motion signal level of the object is greater than a preset sensitivity level according to the control signal of the object signal processor. Anti-theft microwave detector with a shield detection circuit, characterized in that consisting of.