JP2007071605A - Crime prevention sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly reliable crime prevention sensor capable of preventing false reports as much as possible and performing accurate detection. <P>SOLUTION: The crime prevention sensor includes a microwave sensor 110 for transmitting microwaves toward a detection area, receiving reflected waves of the microwaves from an object present in the detection area, outputting distance information corresponding to the distance to the object, and outputting vertical angle information corresponding to the direction to the object; a means 120 for determining the presence of objects to be detected and determining the presence of the object to be detected in the detection area when the distance information lies within a prescribed distance range determined according to the both the vertical angle information and information on the height of a position of installation; and an alarm signal output control means 130 for performing control in such a way as to output alarm signals when it is determined by the means 120 for determining the presence of objects to be detected that the object to be detected is present. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a security sensor incorporating a microwave sensor, and more particularly to a security sensor that improves reliability by avoiding the occurrence of false alarms as much as possible.

  Conventionally, as one of crime prevention devices, microwaves are transmitted toward a detection area, and when a human body (intruder) exists in the detection area, a reflected wave from the human body (a microwave modulated by the Doppler effect) ) Is detected (see, for example, Patent Document 1).

Further, as a type of microwave sensor, a type of measuring a distance to a detection target object such as a human body existing in a detection area using a plurality of microwaves having different frequencies has been proposed (for example, , See Patent Document 2). This type of sensor transmits, for example, two types of microwaves having different frequencies toward a detection area, and detects a phase difference between two IF signals based on the respective reflected waves. This phase difference has a correlation with the distance to the detection target object, and the phase difference tends to increase as the distance to the detection target object increases. In other words, the distance to the detection target object can be measured by obtaining this phase difference. It is also possible to determine whether or not the detection target object in the detection area is moving by recognizing the temporal change in the phase difference. Thereby, for example, it becomes possible to identify only the detection target object moving in the detection area.
JP 7-37176 A JP 2003-207462 A

  However, when the microwave sensor as described above is attached to a relatively high position such as a wall surface (for example, a height of 4 m from the ground) and the area to be warned is looked down from the position, The cause of such misinformation was considered.

  For example, when a bird flying at a height that is almost horizontal from the location of the microwave sensor and is not normally thought of as a human body is detected, or actually reflected by a distant car, etc. This is the case when microwaves are picked up. The same applies when a small animal walking on the ground or crawling is detected.

  In view of such problems of the prior art, the object of the present invention is to accurately recognize the distance to the detection target object and the height of the detection target object, thereby preventing the occurrence of false alarms as much as possible and performing accurate detection. It is to provide a highly reliable crime prevention sensor that can be performed.

  In order to achieve the above object, the security sensor of the present invention transmits a microwave toward a detection area, receives a reflected wave of the microwave from an object existing in the detection area, and reaches the object. A microwave sensor that outputs distance information corresponding to the distance and outputs vertical angle information corresponding to the direction of the object, and the distance information includes the vertical angle information and the height information of the installed position. A detection target object presence determining unit that determines that a detection target object exists in the detection area when the distance is within a predetermined distance range, and a detection target object by the detection target object presence determination unit And a warning signal output control means for controlling so as to output a warning signal when it is determined that the signal exists.

  Here, in order to make the microwave sensor detect the distance, for example, a plurality of microwaves having different frequencies are transmitted toward the detection area, and each of the microwaves reflected from an object existing in the detection area is reflected. Although the structure which receives a wave and calculates | requires the said distance information is mentioned, It is not restricted to this.

  In order to make the microwave sensor detect the vertical angle, for example, the direction variable antenna device capable of changing the vertical angle of the microwave transmission / reception direction, and the transmission / reception direction with respect to the direction variable antenna device are set at a predetermined angle. A configuration further includes scanning measuring means for instructing scanning within a range, monitoring the distance information during the scanning, and obtaining the vertical angle information based on the result. In this case, a range that the vertical angle information can take may be divided into a plurality of sections, and the predetermined distance range may be determined for each of the plurality of sections. Examples of the direction variable antenna device include a phased array antenna, but are not limited thereto.

  Another example of causing the microwave sensor to detect the vertical angle is a configuration in which the vertical angle information is obtained by a monopulse method using a plurality of antennas for reception. Examples of the monopulse system include an amplitude comparison monopulse system that uses a plurality of antennas that are partially overlapped for reception, a phase comparison monopulse system, and the like. Note that this monopulse system processes one pulse (monopulse) at one beam position.

  According to the security sensor having such a configuration, it is possible to prevent as much as possible false alarms due to birds flying in the air, and the reliability as a security sensor can be improved.

  Alternatively, the security sensor of the present invention transmits a microwave toward a detection area, receives a reflected wave of the microwave from an object existing in the detection area, and corresponds to a distance to the object. A microwave sensor that outputs information and outputs vertical angle information corresponding to the direction of the object, and the height of the object based on the distance information, the vertical angle information, and the height information of the installed position. Detection target object presence determining means for determining the presence of a detection target object in the detection area when the height information of the object is within a predetermined height range, and the detection target object A warning signal output control unit that controls to output a warning signal when the presence determination unit determines that the detection target object is present may be provided.

  According to the security sensor having such a configuration, it is possible to prevent not only false alarms due to birds flying in the air but also false alarms due to small animals walking on the ground, etc. The reliability of the can be further increased.

  The security sensor further includes an inclination input means for inputting an inclination of the posture in the installed state, and the detection target object presence determination means includes information input by the inclination input means, the distance information, and the vertical angle information. The height information of the object may be obtained based on the height information of the installed position.

  Here, as the tilt input means, an angle sensor may be built in and the tilt may be automatically detected and input. Alternatively, the input may be performed by connecting a switch, a volume, or the like and manually changing the state thereof.

  According to the crime prevention sensor having such a configuration, it is possible to prevent not only false alarms caused by birds flying in the air, but also false alarms caused by small animals walking or crawling on the ground as much as possible. Since accurate detection is always possible regardless of the installation posture, the reliability as a security sensor can be further enhanced.

  The crime prevention sensor may further include a height range input unit, and the detection target object presence determination unit may determine the predetermined height range based on information input by the height range input unit. Good.

  Here, examples of the height range input means include a DIP switch, but are not limited thereto.

  According to the security sensor having such a configuration, the predetermined height range can be easily changed, and appropriate detection can be performed according to the purpose, installation location, etc., so that the application range as a security sensor can be expanded. It becomes possible.

  According to the security sensor of the present invention, it is possible to prevent as much as possible false alarms caused by birds flying in the air or small animals walking or roaming the ground, and the reliability as a security sensor can be improved. .

  Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment>
FIG. 1 is a block diagram showing a schematic configuration of a security sensor 100 according to the first embodiment of the present invention. As shown in FIG. 1, a security sensor 100 includes a microwave sensor 110 having a phased array antenna 111 capable of changing the vertical angle in the microwave transmission / reception direction, and a human body based on the output from the microwave sensor 110. Detection target object presence determination unit 120 that determines whether or not a detection target object exists in the detection area, and warning output control that controls output of a warning signal based on the determination result by the detection target object presence determination unit 120 Part 130.

  The phased array antenna 111 includes a plurality of antenna elements 112 arranged at equal intervals in the vertical direction in the same direction, and phase shift control for controlling the amount of phase shift in the signal transmission path between these antenna elements 112 within a predetermined range. Circuit 113. Note that the directivity of the phased array antenna 111 is preferably narrow. The phase shift control circuit 113 is of a type that can change the transmission / reception direction of the microwave (the beam direction of the antenna) in stages by changing the phase shift amount in stages. Here, the transmission / reception direction can be changed to four directions within a range of about 90 degrees, but this is merely an example.

  The microwave sensor 110 is a type that transmits and receives microwaves having two different frequencies, and transmits microwaves from the phased array antenna 111 to the detection area. The transmitted microwave is reflected when any object is present in the detection area, and a part of the reflected microwave is received back in the direction of the phased array antenna 111. Then, the microwave sensor 110 detects the phase difference between the two IF signals based on the received reflected waves, calculates the distance to the detected object based on the phase difference, and outputs it as a detected object distance signal. .

  The microwave sensor 110 further performs scanning by instructing the phase shift control circuit 113 to control the amount of phase shift, and monitors the detected object distance signal during the scan. A scanning measurement unit 114 is provided for obtaining a microwave transmission / reception direction (corresponding to one of the four directions) when obtained. Then, the obtained transmission / reception direction is output as a vertical angle signal corresponding to the direction of the detected object.

  The detected object distance signal and the vertical angle signal output from the microwave sensor 110 are input to the detection target object presence determination unit 120. Further, based on the height at which the microwave sensor 110 is actually installed, distance ranges that can be detected when an intruder is present are set for each of the four directions of the vertical angle signal (details are shown in the figure). 2). Only when the detected object distance signal is within the distance range corresponding to the vertical angle signal, it is determined that an intruder or the like exists in the detection area.

  The warning output control unit 130 receives the determination result output from the detection target object presence determination unit 120, and controls the output of the warning signal Dout1 based on the determination result output. Here, the output format of the warning signal Dout1 is an open drain or an open collector. The output of the warning signal Dout1 is ON when the detection target object presence determination unit 120 determines that the detection target object exists, and is open when it is determined that the detection target object does not exist. Shall be. However, it is not limited to such an output format.

  For example, the scanning measurement unit 114, the detection target object presence determination unit 120, the warning output control unit 130, and the like can be realized by embedded software such as a one-chip microcomputer, but are not limited to such an implementation method.

  FIG. 2 is a side view showing an installation example of the security sensor 100 according to the first embodiment of the present invention. As shown in FIG. 2, the security sensor 100 has a rated distance (maximum distance at which effective detection is possible) of 30 m and an installation height H0 from the ground 12 of 4 m, but is limited to these values. is not.

  The detection area is divided into four small detection areas A1 to A4 corresponding to four directions that can be transmitted and received by the phased array antenna 111. First, the small detection area A1 is formed slightly downward from the installation position of the security sensor 100 in the horizontal direction. The position of the upper boundary of the small detection area A1 is almost entirely at the installation height H0, and the position of the tip of the lower boundary is at the predetermined height H1 at the rated distance. Here, the maximum height at which a normal intruder 10 or the like can be detected is set as the predetermined height H1. For example, although it is 2.5 m, it is not limited to this height.

  The small detection area A2 is formed adjacent to the lower side of the small detection area A1, and the position of the lower boundary tip is just the ground 12 at the rated distance. The small detection area A3 is formed adjacent to the lower side of the small detection area A2, and the position of the tip of the lower boundary is the ground 12 that is 10 m ahead. The small detection area A4 is formed adjacent to the lower side of the small detection area A3, and the position of the lower boundary tip is the ground 12 about 3 m ahead.

  In such a case, when an actual intruder 10 or the like is detected, the distance to the intruder 10 is within a range where the horizontal distance from the security sensor 100 is just below the installation location to the rated distance. The height of the intruder 10 should be equal to or less than the predetermined height H1. Further, if a predetermined height H2 (for example, 0.5 m) is defined in order to identify an object having a very low height such as a small animal, the height of the intruder 10 should be equal to or higher than the predetermined height H2. . That is, the intruder 10 or the like has a horizontal distance from the security sensor 100 immediately below the installation location to the rated distance, a lower limit value of the height is the predetermined height H2, and an upper limit value of the height is the predetermined height H1. It should exist in the rectangular area R1 defined by Therefore, when the detected object exists outside the rectangular area R1, it is difficult to consider it as an actual intruder 10 and there is a high possibility of erroneous detection. Therefore, it is only necessary not to turn on the output of the warning signal Dout1. .

  However, in the configuration of the security sensor 100, the vertical angle corresponding to the direction of the detected object can only be roughly understood from any of the above four directions, and 2 of the detected object by combining the distance information. It is not possible to accurately recognize the dimension position and directly determine the inside and outside of the rectangular region R1.

  Therefore, as a simple discrimination method instead, for each of the small detection areas A1 to A4, a distance range that can be detected when the intruder 10 exists is set in advance, and the detected object distance signal is within the distance range. Only in some cases, it is determined that an intruder 10 or the like exists in the detection area. In other words, if the detected object distance signal is outside the distance range, it is determined that the possibility of erroneous detection is high.

  Note that this detected object distance signal is strictly the distance in the horizontal direction on the ground 12 from the point immediately below the installation location of the security sensor 100 to the feet of the intruder 10 (the numerical value of the scale below the ground 12 in FIG. 2). It corresponds to the distance in the oblique direction from the security sensor 100 to the intruder 10 instead of “horizontal distance”. However, for simplification of description, the horizontal distance value is shown below.

  First, regarding the small detection area A1, since it is usually impossible to assume that the intruder 10 exists at such a height, the distance range that can be detected is set to “none”.

  For the small detection area A2, the shortest distance that can be detected is considered to be the distance to the vicinity of the intersection of the lower boundary of the small detection area A2 and the upper boundary of the rectangular region R1, and is about 12 m. Since the maximum distance that can be detected is substantially limited by the rated distance, a distance greater than this rated distance is not detected. Therefore, it is sufficient to set only the lower limit value such as “12 m or more” as the distance range that can be detected.

  For the small detection area A3, the shortest distance that can be detected is considered to be the distance to the vicinity of the intersection of the lower boundary of the small detection area A3 and the upper boundary of the rectangular region R1, and is about 4 m. The longest distance that can be detected is considered to be the distance to the vicinity of the intersection of the upper boundary of the small detection area A3 and the lower boundary of the rectangular region R1, and is about 25 m. Therefore, the distance range that can be detected is set to “4 to 25 m”.

  For the small detection area A4, the shortest distance that can be detected is considered to be the distance to the vicinity of the intersection of the lower boundary of the small detection area A4 and the upper boundary of the rectangular region R1, and is about 2 m. The longest distance that can be detected is considered to be the distance to the vicinity of the intersection of the upper boundary of the small detection area A4 and the lower boundary of the rectangular area R1, and is about 8 m. Therefore, the distance range that can be detected is set to “2 to 8 m”.

  By setting such a distance range, it is possible to prevent as much as possible false alarms due to birds flying in the air, and the reliability as a security sensor can be improved.

Second Embodiment
If the vertical angle of the detected object can be measured in more detail, the two-dimensional position of the detected object projected on the vertical plane including the security sensor can be accurately specified. In this case, it is possible to determine that not only an object at a position that is too high but also an object that is at a position that is too low is not an actual intruder, so that no warning is given. Therefore, as another method for obtaining the vertical angle of the sensing object, a method using a monopulse method in which angle information is obtained by processing one pulse (monopulse) at one beam position will be described below as a second embodiment. To do. Note that the same reference numerals are assigned to the same components as those in the first embodiment described above, and the description will mainly focus on the differences.

  FIG. 3 is a block diagram showing a schematic configuration of a security sensor 200 according to the second embodiment of the present invention. As shown in FIG. 3, the security sensor 200 is based on a microwave sensor 210 having antenna elements 212 and 212 arranged one above the other so that parts of the beam overlap each other, and an output from the microwave sensor 210. A detection target object presence determination unit 220 that determines whether or not a detection target object such as a human body exists in the detection area, and controls output of a warning signal based on a determination result by the detection target object presence determination unit 220. And a warning output control unit 130.

  The microwave sensor 210 obtains the vertical angle information of the detected object by the amplitude comparison monopulse method and outputs it as a vertical angle signal, and transmits and receives microwaves of two different frequencies as in the first embodiment. Is obtained as a detected object distance signal. However, the present invention is not limited to the amplitude comparison monopulse method, and a phase comparison monopulse method may be used.

  The detected object distance signal and the vertical angle signal output from the microwave sensor 210 are input to the detection target object presence determination unit 220. Unlike the first embodiment, since the vertical angle has a high resolution, the two-dimensional position of the detected object can be calculated by combining the installation height H0 of the security sensor 200. Based on the two-dimensional position, the presence / absence of an intruder in the detection area is determined.

  FIG. 4 is a side view showing an installation example of the security sensor 200 according to the second embodiment of the present invention. As shown in FIG. 4, the rated distance of the security sensor 200 and the installation height H0 from the ground 12 are the same values as those in the first embodiment, but are not limited to these values.

  What can be considered as the actual two-dimensional position of the intruder 10 is the range from the distance corresponding to the point directly below the installation location of the security sensor 200 to the rated distance. Although it is considered that the height is within a certain range, the same predetermined height H1 (for example, 2.5 m) as that of the first embodiment is used as the upper limit value, and the lower limit value is the same as that of the first embodiment. A predetermined height H2 is used. The specific setting of the predetermined height H2 may be 0.5 m, for example, but is not limited to this height.

  Whether or not the detected object is the actual intruder 10 is determined based on whether the two-dimensional position is the horizontal distance from the security sensor 200 from directly under the installation location to the rated distance, and the lower limit of the height is a predetermined height H2. In other words, this corresponds to determination as to whether or not the upper limit value of the height is within the rectangular region R1 defined by the predetermined height H1. However, since the distance detected by the microwave sensor 210 is at most the rated distance, it is only necessary to determine whether or not the height of the detected object is within the range of the predetermined height H2 to the predetermined height H1. It will be.

  If the distance to the intruder 10 is d and the depression angle as the vertical angle information (the downward angle from the horizontal direction) is θ, the height Ht of the intruder 10 can be calculated by the following equation.

Ht = H0−d · sin θ (1)
Therefore, it is only necessary to cause the detection target object presence determination unit 220 to perform the calculation according to the above equation to obtain the height Ht and to determine whether or not the height Ht satisfies the following conditional expression.

H2 ≦ Ht ≦ H1 (2)
According to the above configuration, it is possible to prevent not only false alarms caused by birds flying in the air, but also false alarms caused by small animals walking or roaming on the ground as much as possible. The sex can be increased.

<Third Embodiment>
The security sensors of the first embodiment and the second embodiment described above are installed on a wall surface or the like, and are monitored so as to look down far from a position almost directly below the installation position. However, the installation location is not limited to a wall surface or the like, and for example, it may be installed on the ceiling of the room. In addition, the posture of the security sensor at the time of installation is not always the same. Therefore, a security sensor taking such points into consideration will be described below as a third embodiment. It should be noted that the same constituent elements as those in the above-described embodiments are denoted by the same reference numerals, and the description will mainly be made on differences.

  FIG. 5 is a block diagram showing a schematic configuration of a security sensor 300 according to the third embodiment of the present invention. As shown in FIG. 5, the security sensor 300 includes a microwave sensor 310 having a phased array antenna 311 that can change the vertical angle in the microwave transmission / reception direction, and an inclination of the installation posture from a standard state. An angle sensor 340 for detecting whether or not, a DIP switch 350 capable of manually changing various settings, and a detection target object such as a human body based on signals from the microwave sensor 310, the angle sensor 340 and the DIP switch 350 A detection target object presence determination unit 320 that determines whether or not the detection target object exists in the inside, and a warning output control unit 130 that controls the output of a warning signal based on the determination result by the detection target object presence determination unit 320. .

  Here, the phase shift control circuit 313 included in the phased array antenna 311 is a type in which the phase shift amount can be finely changed, and the scanning measurement unit 314 included in the microwave sensor 310 determines the phase shift amount corresponding thereto. Fine control is possible. Thereby, high resolution is ensured for the vertical angle signal corresponding to the direction of the detected object.

  The angle sensor 340 is also called an inclination sensor, and detects how much the installation posture of the security sensor 300 is inclined from a standard state. For example, it is possible to identify these states even when installed in a horizontal direction or directly downward, or in a diagonally downward direction.

  In the DIP switch 350, an upper limit value and a lower limit value for determining whether the detected object is an actual intruder or the like can be manually changed. Note that the values that allow the setting to be changed are not limited to these values. For example, the installation height may be input.

  FIG. 6 is a diagram for explaining the difference in height between an intruder and a small animal. As shown in FIG. 6, the height of a human being as an intruder is about 1.7 m, for example, and the height of a small animal such as a dog is about 0.5 m, for example. Therefore, in order to accurately identify these by the difference in height, for example, a difference of 1 m or more needs to be detectable.

  FIG. 7 is a diagram showing an example in which the security sensor 300 is installed on the ceiling 14 in a direction directly below. As shown in FIG. 7, the security sensor 300 forms a detection area A300 in a range of about 45 degrees on both sides of the front direction C300 and about 90 degrees.

  Here, if the installation height H10 of the security sensor 300 is 10 m, for example, the distance from the security sensor 300 to the floor surface 13 along the front direction C300 is the same 10 m, but along both side boundaries of the detection area A300. The distance to the floor 13 is 14.1 m, which is a difference of 4,1 m. That is, the height of the object cannot be accurately determined only by the distance to the object detected by the security sensor 300.

  Therefore, the height Ht of the intruder 10 is accurately determined taking into account the vertical angle when the intruder 10 is detected, θ (the counterclockwise direction in the figure is the plus side with respect to the front direction C300). What is necessary is just to calculate. If the distance to the intruder 10 is d, the height Ht can be calculated by the following equation.

Ht = H10−d · cos θ (3)
As the detection operation of the security sensor 300, the detection target object presence determination unit 320 first determines the upper limit value H11 and the lower limit value H12 of the height determination according to the state of the DIP switch 350, and then calculates according to the above equation. The height Ht may be obtained by performing the determination, and it may be determined whether or not the height Ht satisfies the following conditional expression.

H12 ≦ Ht ≦ H11 (4)
FIG. 8 is a view showing an example in which the security sensor 300 is installed obliquely downward from a high position. As shown in FIG. 8, the security sensor 300 is installed with an inclination of about 45 degrees with respect to the installation state of FIG. And the other boundary is formed in a substantially horizontal direction from the place where the security sensor 300 is installed.

  In this case, the installation height of the security sensor is H10, the inclination with respect to the installation state of FIG. 7 detected by the angle sensor 340 is φ, and the vertical angle when the intruder 10 is detected is θ (based on the front direction C300. If the distance to the intruder 10 is d, the height Ht of the intruder 10 can be calculated by the following equation. In FIG. 8, θ is a negative value, and (φ + θ) is a smaller value than φ alone.

Ht = H10−d · cos (φ + θ) (5)
Then, similarly to the case described above, it may be determined whether or not the height Ht satisfies the following conditional expression.

H12 ≦ Ht ≦ H11 (6)
FIG. 9 is a flowchart showing an outline of the detection operation of the security sensor 300.

  As shown in FIG. 9, the detection target object presence determination unit 320 first reads the inclination φ of the security sensor 300 detected by the angle sensor 340 and determines the height of the object detected from the state of the DIP switch 350. The upper limit value H11 and the lower limit value H12 are read (step S1).

  Next, the height Ht is calculated according to the above equation (5) (step S2).

  Then, the height Ht is compared with the lower limit value H12 (step S3). If the height Ht is larger than the lower limit value H12, the height Ht is further compared with the upper limit value H11 (step S4). A warning is issued to warn of the presence of the person (step S5). If the height Ht is equal to or lower than the lower limit value H12 or the upper limit value H11, the process returns to step S1 to repeat the processing of each step from the beginning.

  According to the above configuration, it is possible to prevent as much as possible false alarms due to small animals walking or crawling on the ground, as well as false alarms due to birds flying in the air. Regardless of this, since accurate detection is always possible, the reliability as a security sensor can be further enhanced.

<Other embodiments>
Instead of the angle sensor 340 of the third embodiment described above, a switch or volume is connected to the detection target object presence determination unit 320, and the inclination φ of the installation state of the security sensor 300 can be input by these switches or volume. You may comprise as follows. In addition, the constituent elements of the above embodiments may be appropriately combined or partially replaced.

  It should be noted that the present invention can be implemented in various other forms without departing from the spirit or main features thereof. Therefore, the above-described embodiments are merely examples in all respects and should not be interpreted in a limited manner. The scope of the present invention is indicated by the claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

It is a block diagram showing a schematic structure of a security sensor concerning a 1st embodiment of the present invention. It is a figure which shows the example of installation of the security sensor which concerns on 1st Embodiment of this invention from the side. It is a block diagram which shows schematic structure of the security sensor which concerns on 2nd Embodiment of this invention. It is a figure which shows the example of installation of the security sensor which concerns on 2nd Embodiment of this invention from the side. It is a block diagram which shows schematic structure of the security sensor which concerns on 3rd Embodiment of this invention. It is a figure explaining the difference in height between an intruder etc. and small animals. It is a figure which shows the example which installed the security sensor which concerns on 3rd Embodiment of this invention toward the directly downward direction on the ceiling. It is a figure which shows the example which installed the security sensor which concerns on 3rd Embodiment of this invention toward diagonally downward from a high position. It is a flowchart which shows the outline of the detection operation | movement of the security sensor which concerns on 3rd Embodiment of this invention.

Explanation of symbols

100 Security sensor (first embodiment)
DESCRIPTION OF SYMBOLS 110 Microwave sensor 111 Phased array antenna 112 Antenna element 113 Phase shift control circuit 114 Scanning measurement part 120 Detection target object presence determination part 130 Warning output control part 200 Security sensor (2nd Embodiment)
210 Microwave sensor 212 Antenna element 220 Detection target object presence determination unit 300 Security sensor (third embodiment)
310 Microwave sensor 311 Phased array antenna 313 Phase shift control circuit 314 Scanning measurement unit 320 Detection target object presence determination unit 340 Angle sensor 350 DIP switch

Claims (15)

A microwave is transmitted toward the detection area, a reflected wave of the microwave from the object existing in the detection area is received, distance information corresponding to the distance to the object is output, and the object's A microwave sensor that outputs vertical angle information corresponding to the direction;
When the distance information is within a predetermined distance range determined according to the vertical angle information and the height information of the installed position, the detection target object exists in the detection area. Detection target object presence determination means for determining;
A security sensor comprising: a warning signal output control unit that controls to output a warning signal when it is determined by the detection target object presence determination unit that a detection target object is present. The security sensor according to claim 1,
The microwave sensor transmits a plurality of microwaves having different frequencies toward the detection area, receives a reflected wave of each of the microwaves from an object existing in the detection area, and obtains the distance information. Security sensor characterized by that. The security sensor according to claim 1 or 2,
The microwave sensor further includes:
A directional variable antenna device capable of changing the vertical angle of the microwave transmission and reception direction;
Scanning measuring means for instructing the direction variable antenna apparatus to scan the transmission / reception direction over a predetermined angle range, monitoring the distance information during the scanning, and obtaining the vertical angle information based on the result; A security sensor comprising: The security sensor according to claim 1 or 2,
A security sensor characterized in that a range that the vertical angle information can take is divided into a plurality of sections, and the predetermined distance range is defined for each of the plurality of sections. The security sensor according to any one of claims 1 to 4,
A security sensor, wherein the direction variable antenna device is a phased array antenna. The security sensor according to claim 1,
The microwave sensor is characterized in that the vertical angle information is obtained by a monopulse method using a plurality of antennas for reception. The security sensor according to claim 6,
The microwave sensor is characterized in that the vertical angle information is obtained by an amplitude comparison monopulse method using a plurality of antennas in which a part of a beam overlaps for reception. The security sensor according to claim 6,
A crime prevention sensor characterized in that the monopulse method in the microwave sensor is a phase comparison monopulse method. A microwave is transmitted toward the detection area, a reflected wave of the microwave from the object existing in the detection area is received, distance information corresponding to the distance to the object is output, and the object's A microwave sensor that outputs vertical angle information corresponding to the direction;
The height information of the object is obtained based on the distance information, the vertical angle information, and the height information of the installed position, and the detection is performed when the height information of the object is within a predetermined height range. A detection target object presence determining means for determining that a detection target object exists in the area;
A security sensor comprising: a warning signal output control unit that controls to output a warning signal when it is determined by the detection target object presence determination unit that a detection target object is present. The security sensor according to claim 9,
Further comprising an inclination input means for inputting the inclination of the posture in the installed state;
The detection target object presence determining means obtains the height information of the object based on the information inputted by the tilt input means, the distance information, the vertical angle information, and the height information of the installed position. Security sensor characterized by. The security sensor according to claim 10,
The security sensor according to claim 1, wherein the tilt input means is an angle sensor. The security sensor according to claim 10,
A security sensor according to claim 1, wherein the tilt input means is a switch. The security sensor according to claim 10,
A security sensor, wherein the tilt input means is a volume. The security sensor according to claim 9,
Further comprising a height range input means,
The security sensor characterized in that the detection target object presence determination means determines the predetermined height range based on information input by the height range input means. The security sensor according to claim 14,
A security sensor, wherein the height range input means is a DIP switch.

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