WO2007029610A1

WO2007029610A1 - Intrusion sensor

Info

Publication number: WO2007029610A1
Application number: PCT/JP2006/317318
Authority: WO
Inventors: Masatoshi Tsuji
Original assignee: Optex Co., Ltd.
Priority date: 2005-09-05
Filing date: 2006-09-01
Publication date: 2007-03-15
Also published as: JP2007071605A

Abstract

An intrusion sensor includes: a microwave sensor (110) for transmitting a microwave toward a detection area and receiving a reflected wave of the microwave from an object existing in the detection area, so as to output distance information corresponding to a distance to the object and output perpendicular angle information corresponding to the direction of the object; detection object existence judgment means (120) for judging that a detection object exists in the detection area when the distance information is within a predetermined distance range decided according to the perpendicular angle information and height information on the set position; and alarm signal output control means (130) for outputting an alarm signal when the detection object existence judgment means has judged that a detection objection exists.

Description

Specification

Intrusion detection sensor

Technical field

TECHNICAL FIELD [0001] The present invention relates to an intrusion detection sensor incorporating a microwave sensor, and more particularly to an intrusion detection sensor that improves reliability by avoiding the occurrence of false alarms as much as possible.

Background art

Conventionally, as one of the crime prevention devices, microwaves are transmitted toward a detection area, and when a human body (intruder) exists in the detection area, a reflected wave of the human strength (due to the Doppler effect) A microwave sensor that detects a human body by receiving a modulated microwave (see, for example, Patent Document 1) o

[0003] Further, as a type of microwave sensor, there has been proposed one that measures 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. (For example, refer to Patent Document 2.) ₀ This type of sensor transmits two types of microwaves with different frequencies to the detection area, for example, and the phase difference between the two IF signals based on the reflected waves. Is supposed to be detected. This phase difference correlates 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 object to be detected 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. As a result, for example, it is possible to identify only the detection target object moving within the detection area.

Patent Document 1: JP-A-7-37176

Patent Document 2: Japanese Patent Laid-Open No. 2003-207462

Disclosure of the invention

Problems to be solved by the invention

[0004] However, 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 that position. In this case, the following causes of misinformation were considered.

[0005] For example, when a bird flying at a height that is almost horizontal from the installation position of the microwave sensor and is not normally considered to be a human body is detected, or in the case of a distant automobile This is a case where the microwave reflected by such as is picked up. The same applies when a small animal walking or crawling on the ground is detected.

[0006] 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. It is to provide a highly reliable intrusion detection sensor capable of performing simple detection. Means for solving the problem

[0007] The intrusion detection sensor of the present invention transmits a microwave toward a detection area, receives a reflected wave of the microwave of an object force existing in the detection area, and receives a distance to the object. And a distance sensor corresponding to the direction of the object, a microwave sensor that outputs the vertical angle information corresponding to the direction of the object, and the distance information according to the vertical angle information and the height information of the installed position. Detection target object presence determination means for determining that the detection target object is present in the detection area, and the detection target object by the detection target object presence determination means. 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 cause the microwave sensor to detect the distance, for example, a plurality of microwaves having different frequencies are transmitted to the detection area, and the object force existing in the detection area A force that can receive the reflected wave of each microwave and obtain the distance information is not limited to this.

[0009] Further, in order for the microwave sensor to detect the vertical angle, for example, the direction variable antenna device capable of changing the vertical angle in the transmission / reception direction of the microphone mouth wave, and the transmission / reception with respect to the direction variable antenna device are provided. There is a configuration that further includes scanning measuring means that instructs to scan the direction over a predetermined angle range, monitors the distance information during the scanning, and obtains the lead right angle information based on the result. In such a case, the range that the vertical angle information can take is divided into a plurality of sections, and the above-mentioned location is divided into each of the plurality of sections. A constant distance range may be defined. The direction variable antenna device is not limited to force including, for example, a phased array antenna.

[0010] As another example of causing the microwave sensor to detect the vertical angle, there 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 method include an amplitude comparison monopulse method using a plurality of antennas that overlap a part of a beam for reception, and a phase comparison monopulse method. Note that this monopulse system processes one pulse (monopulse) at one beam position.

[0011] According to the intrusion detection sensor having such a configuration, it is possible to prevent as much as possible false alarms caused by birds flying in the air, and the reliability as the intrusion detection sensor can be improved.

Alternatively, the intrusion detection sensor according to 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 of the object and also outputs vertical angle information corresponding to the direction of the object, and the distance information, the vertical angle information, and the height information of the installed position. Based on this, the height information of the object is obtained, and when the height information of the object is within a predetermined height range, it is determined that a detection target object exists in the detection area! / Characterized in that it comprises an object presence determination means and a warning signal output control means for controlling to output a warning signal when it is determined by the detection target object presence determination means that a detection target object exists. !,.

[0013] According to the intrusion detection sensor having such a configuration, it is possible to prevent as much as possible false alarms caused by small animals walking or roaming on the ground as well as false alarms caused by birds flying in the air. The reliability as an intrusion detection sensor can be further increased.

[0014] Further, the intrusion detection sensor further includes a tilt input unit that inputs a tilt of the posture in the installed state, and the detection target object presence determination unit includes the information input by the tilt input unit and the distance information. The height information of the object may be obtained based on the vertical angle information and the height information of the installed position.

[0015] Here, as the tilt input means, an angle sensor is built in to automatically detect the tilt. May be input. Or you may make it input by connecting a switch, a volume, etc., and changing those states manually.

[0016] According to the intrusion detection sensor having such a configuration, it is possible to prevent as much as possible false alarms caused by small animals walking or roaming on the ground as well as false alarms caused by birds flying in the air. In addition, since accurate detection is always possible regardless of the installation posture, the reliability as an intrusion detection sensor can be further enhanced.

[0017] Further, the intrusion detection sensor further includes a height range input unit, and the detection target object presence determination unit determines the predetermined height range based on information input by the height range input unit. If you decide,

Here, the height range input means is not limited to a force such as a DIP switch.

[0019] According to the intrusion detection sensor having such a configuration, the predetermined height range can be easily changed, and appropriate detection can be performed according to the purpose and installation location. The range can be expanded.

The invention's effect

[0020] According to the intrusion detection 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 hitting the ground. Reliability can be increased.

Brief Description of Drawings

FIG. 1 is a block diagram showing a schematic configuration of an intrusion detection sensor according to a first embodiment of the present invention.

[Fig. 2] Fig. 2 is a diagram showing a side force of an installation example of the intrusion detection sensor according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a schematic configuration of an intrusion detection sensor according to a second embodiment of the present invention.

[FIG. 4] FIG. 4 is a diagram showing a lateral force of an installation example of an intrusion detection sensor according to a second embodiment of the present invention.

FIG. 5 is a block diagram showing a schematic configuration of an intrusion detection sensor according to a third embodiment of the present invention. FIG.

[FIG. 6] FIG. 6 is a diagram for explaining a difference in height between an intruder and a small animal.

[7] FIG. 7 is a view showing an example in which the intrusion detection sensor according to the third embodiment of the present invention is installed on the ceiling in the downward direction.

8] FIG. 8 is a view showing an example in which the intrusion detection sensor according to the third embodiment of the present invention is installed with a high positional force also directed obliquely downward.

[9] FIG. 9 is a flowchart showing an outline of the detection operation of the intrusion detection sensor according to the third embodiment of the present invention. Explanation of symbols

100 Intrusion detection sensor (first embodiment)

110 Microwave sensor

111 Phased array antenna

112 Antenna element

113 Phase shift control circuit

114 Scan measurement unit

120 Object detection unit

130 Warning output controller

200 Intrusion detection sensor (second embodiment)

210 Microwave sensor

212 Antenna element

220 Object detection unit

300 Intrusion detection sensor (Third embodiment)

310 Microwave sensor

311 Phased array antenna

313 Phase shift control circuit

314 Scanning measurement unit

320 Object detection unit

340 angle sensor 350 DIP switch

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a schematic configuration of an intrusion detection sensor 100 according to the first embodiment of the present invention. As shown in FIG. 1, the intrusion detection sensor 100 is based on a microwave sensor 110 having a phased array antenna 111 capable of changing the vertical angle in the microwave transmission / reception direction, and an output from the microwave sensor 110. ! /, A detection target object presence determination unit 120 that determines whether or not a detection target object such as a human body exists in the detection area, and a warning signal based on the determination result by the detection target object presence determination unit 120 And a warning output control unit 130 for controlling the output.

[0025] The phased array antenna 111 controls a plurality of antenna elements 112 arranged vertically at equal intervals in the same direction, and controls the amount of phase shift in the signal transmission path between these antenna elements 112 within a predetermined range. And a phase shift control 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 microwaves (the antenna beam direction) 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 of 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 respective reflected waves received, obtains the distance to the detected object based on the phase difference, and serves as a detected object distance signal. Output.

The microwave sensor 110 further scans 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, thereby detecting an effective detected object. Microwave transmission / reception direction when distance signal is obtained (in the above four directions) A scanning measuring unit 114 for obtaining the same). The obtained transmission / reception direction is output as a vertical angle signal corresponding to the direction of the detected object.

[0028] 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. In addition, 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). (See below with reference to 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 Doutl based on the determination result output. Here, the output format of the warning signal Doutl is open drain or open collector. The output of the warning signal Dout 1 is ON when the detection target object presence determination unit 120 determines that the detection target object exists and is V, and the detection target object exists! / , And when it is! /, It shall be open. However, the output format is not limited to this.

[0030] Note that, for example, the scanning measurement unit 114, the detection target object presence determination unit 120, the warning output control unit 130, and the like are not limited to such a realization method that can be realized by embedded software such as a one-chip microcomputer.

FIG. 2 is a diagram showing a side force of an installation example of the intrusion detection sensor 100 according to the first embodiment of the present invention. As shown in Fig. 2, this intrusion detection sensor 100 has a rated distance (maximum distance for effective detection) of 30m, and the installation height H0 from the ground 12 is 4m. is not.

[0032] 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, in the small detection area A1, the installation position force of the intrusion detection sensor 100 is formed slightly downward with respect to 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 lower boundary tip is at the predetermined height HI at the rated distance. Here, normal intruders at a predetermined height HI 1 Sets the maximum height at which 0 etc. can be detected. For example, a force of 2.5m is not limited to this height.

[0033] 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 lower boundary tip 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 away.

[0034] When an actual intruder 10 or the like is detected in such a case, the distance to the intruder 10 is the horizontal distance from the intrusion detection sensor 100 to the rated distance from directly below the installation location. Within the range, the height of the intruder 10 should be less than or equal to the predetermined height HI. In addition, if a predetermined height H2 (for example, 0.5 m) is defined to identify an object with 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. It is. That is, for an intruder 10 or the like, the horizontal distance from the intrusion detection sensor 100 is the force directly below the installation site and the rated distance, the lower limit of the height is the predetermined height H2, and the upper limit of the height is the predetermined height. It should be in the rectangular area R1 defined by HI. Therefore, if the detected object exists outside the rectangular area R1, there is a high possibility of false detection that is unlikely to be an actual intruder 10, etc., so do not turn on the output of the warning signal Doutl. If you do.

[0035] However, in the configuration of the intrusion detection sensor 100, the vertical angle corresponding to the direction of the detected object is roughly divided by any one of the above four directions, and the distance information is combined. The two-dimensional position of the detected object cannot be accurately recognized, and the inside and outside of the rectangular region R1 cannot be discriminated directly.

[0036] 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 Only when it is within the distance range, it is determined that an intruder 10 exists in the detection area. In other words, if the detected object distance signal is outside the distance range, it is determined that there is a high possibility of erroneous detection!

[0037] It should be noted 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 intrusion detection sensor 100 to the foot of the intruder 10 (under the ground 12 in FIG. 2). Number of division scales. The following “horizontal distance”) corresponds to the diagonal distance from the intrusion detection sensor 100 to the intruder 10. However, for the sake of simplicity, the horizontal distance is assumed below.

[0038] First, for the small detection area A1, it is usually impossible to assume that the intruder 10 exists at such a height, so the distance range that can be detected is set to "none".

[0039] For the small detection area A2, the shortest distance that can be detected is considered to be the distance to the intersection of the lower boundary of the small detection area A2 and the upper boundary of the rectangular area R1, and is about 12 m. . Since the longest distance that can be detected is substantially limited by the rated distance, no distance greater than this rated distance will be detected. Therefore, as the distance range that can be detected, it is sufficient to set only the lower limit value such as “12 m or more”.

[0040] For the small detection area A3, the shortest distance that can be detected is considered to be the distance to the intersection between 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 from the upper boundary of this small detection area A3 to the vicinity of the intersection of the lower boundary of the rectangular area R1, and is about 25 m. Therefore, the distance range that can be detected is set to “4-25m”.

[0041] 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 from the intersection of the upper boundary of the small detection area A4 to 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”.

[0042] 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 to improve the reliability as an intrusion detection sensor.

[0043] <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 intrusion detection sensor can be accurately identified. In this case, it is possible to determine that an object at a position that is too low, not just an object at a position that is too high, is not an actual intruder, so that no warning is given. Therefore, other than obtaining the vertical angle of the sensing object As a second method, a method employing a monopulse method in which angle information can be obtained by processing one pulse (monopulse) at one beam position will be described below as a second embodiment. 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 the intrusion detection sensor 200 according to the second embodiment of the present invention. As shown in FIG. 3, the intrusion detection sensor 200 includes 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. Based on the detection target object presence determination unit 220 for determining whether or not a detection target object such as a human body exists within the detection area, and output of a warning signal based on the determination result by the detection target object presence determination unit 220 And a warning output control unit 130 for controlling the above.

[0045] The microwave sensor 210 obtains the vertical angle information of the sensing object by the amplitude comparison monopulse method, outputs it as a vertical angle signal, and transmits and receives microwaves of two different frequencies as in the first embodiment. The distance information to the detected object is obtained by and output as a detected object distance signal. However, the phase comparison monopulse method may be used instead of the amplitude comparison monopulse method.

The detection target object presence determination unit 220 receives the detection object distance signal and the vertical angle signal output from the microwave sensor 210. 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 intrusion detection sensor 200. Based on the two-dimensional position, the presence or absence of an intruder in the detection area is determined.

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

[0048] What can be considered as a two-dimensional position of the actual intruder 10 is that the distance force corresponding to the point directly below the installation location of the intrusion detection sensor 200 is within the range up to the rated distance. Although the height is considered to be within a certain range, the upper limit is set as the first embodiment. The same predetermined height HI (for example, 2.5 m) is used, and the lower limit value thereof also uses the predetermined height H2 as in the first embodiment. A specific setting of the predetermined height H2 may be 0.5 m, for example, but is not limited to this height.

[0049] Whether or not the detected object is an actual intruder 10 is determined based on its two-dimensional position, the horizontal distance from the intrusion detection sensor 200, and the direct force at the installation location, up to the rated distance. Corresponds to the determination of whether or not the predetermined height H2 is within the rectangular area R1 defined by the predetermined height HI. However, since the distance detected by the microwave sensor 210 is at most the rated distance, it is only necessary to determine whether the detected object height is within the range of the predetermined height H2 to the predetermined height HI. It will be.

[0050] If the distance to the intruder 10 is d and the depression angle (angle from the horizontal direction as the vertical angle information) is Θ, the height Ht of the intruder 10 can be calculated by the following equation.

[0051] Ht = HO — d- sin 0 · · · (1)

Therefore, the detection target object presence determination unit 220 may perform the calculation according to the above equation to obtain the height Ht, and determine whether the height Ht satisfies the following conditional expression.

[0052] H2 ≤ Ht ≤ HI (2)

According to the configuration as described above, it is possible to prevent as much as possible false alarms caused by small animals walking or roaming on the ground with only false alarms caused by birds flying in the air. The sex can be increased.

[0053] <Third embodiment>

The intrusion detection sensors of the first embodiment and the second embodiment described above were installed on a wall surface and monitored so that the position force almost directly below the installation position looked down to a far distance. However, the installation location is not limited to a wall surface. For example, it may be installed on an indoor ceiling. In addition, the orientation of the intrusion detection sensor during installation may not always be the same. Therefore, an intrusion detection sensor considering such points will be described below as a third embodiment. Note that the same reference numerals are assigned to the same components as those in the above-described embodiments, and the description will mainly focus on the differences.

FIG. 5 is a block diagram showing a schematic configuration of an intrusion detection sensor 300 according to the third embodiment of the present invention. As shown in FIG. 5, the intrusion detection sensor 300 has a microwave transmission / reception direction. Microwave sensor 310 with phased array antenna 311 that can change the vertical angle of the sensor, angle sensor 340 that detects how much the installation posture is tilted from the standard state, and various settings can be changed manually Detecting the presence of a detection target object that determines whether a detection target object such as a human body exists in the detection area based on signals from the DIP switch 350, the microwave sensor 310, the angle sensor 340, and the DIP switch 350 Unit 320 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, it is assumed that the phase shift control circuit 313 included in the phased array antenna 311 is of a type capable of finely changing the amount of phase shift, and the scanning measurement unit 314 included in the microwave sensor 310 corresponds to this. This makes it possible to control the amount of phase shift with great force. This ensures a high resolution of the vertical angle signal corresponding to the detected direction of the object.

[0056] The angle sensor 340 is also called an inclination sensor, and detects how much the installation posture of the intrusion detection sensor 300 is inclined to a standard state force. For example, it is possible to identify these states even when installed in a horizontal direction or directly downward, or in an obliquely downward direction.

[0057] In the DIP switch 350, the upper limit value and the lower limit value of the height for determining the force that the detected object is an actual intruder 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 a 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, it is necessary to be able to detect a difference of lm or more.

FIG. 7 shows an example in which the intrusion detection sensor 300 is installed on the ceiling 14 facing downward. As shown in FIG. 7, the intrusion detection sensor 300 forms a detection area A300 in a range of about 45 degrees on the both sides of the front direction C300 and about 90 degrees.

[0060] Here, if the installation height H10 of the intrusion detection sensor 300 is 10 m, for example, the distance from the intrusion detection sensor 300 to the floor 13 along the front direction C300 is the same 10 m. The distance to the floor 13 along the boundary on both sides of Area A300 is 14. lm, which is a difference of 4 lm. In other words, the height of an object cannot be accurately determined only by the distance to the object detected by the intrusion detection sensor 300.

[0061] Therefore, the height of the intruder 10 is determined by taking into account the vertical angle when the intruder 10 is detected Θ (the front direction C300 is the reference and the counterclockwise direction in the figure is the plus side) Ht Should be calculated accurately. If the distance to the intruder 10 is d, this height Ht can be calculated by the following equation.

[0062] Ht = H10-d-cos 0 · · · (3)

As the detection operation of the intrusion detection 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 follows the above formula. The height Ht is obtained by performing the above calculation, and it is determined whether the height Ht satisfies the following conditional expression.

[0063] H12 ≤ Ht ≤ H11 (4)

FIG. 8 is a diagram showing an example in which the intrusion detection sensor 300 is installed with a high positional force directed obliquely downward. As shown in FIG. 8, the intrusion detection sensor 300 is installed with an inclination of about 45 degrees with respect to the installation state of FIG. 7, and one boundary of the detection area A300 is from the installation location of the intrusion detection sensor 300. It is formed so that it is located almost directly below and the other boundary is located substantially horizontally from the installation location of the intrusion detection sensor 300.

[0064] In this case, the installation height of the intrusion detection sensor 300 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 (front direction C300 The height Ht of the intruder 10 can be calculated by the following equation, where d is the distance to the intruder 10. In FIG. 8, since Θ is a negative value, (φ + 0) is a smaller angle than φ alone.

[0065] Ht = H10-d-cos (+ Θ) · · · · (5)

Then, as in the case described above, it may be determined whether or not the height Ht satisfies the following conditional expression.

[0066] H12 ≤ Ht ≤ H11 (6)

FIG. 9 is a flowchart showing an outline of the detection operation of the intrusion detection sensor 300.

As shown in FIG. 9, the detection target object presence determination unit 320 first uses the angle sensor 340. Then, the detected inclination φ of the intrusion detection sensor 300 is read, and the upper limit value H11 and the lower limit value H12 for judging the height of the detected object are also read (step Sl).

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

[0069] 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 HI 1 (step S4), and the upper limit value HI 1 If it is smaller, a warning is issued to warn of the presence of an intruder (step S5). If the height Ht is less than or equal to the lower limit value H12 or the upper limit value HI 1, the process returns to step S1 and repeats the processing of each step from the beginning.

[0070] According to the configuration as described above, it is possible to prevent as much as possible misinformation caused by small animals walking or crawling on the ground only by misinformation due to birds flying in the air. Since accurate detection is always possible regardless of the installation posture, the reliability of the intrusion detection sensor can be further enhanced.

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 intrusion detection sensor 300 is determined by these switches or volume. You may comprise so that it can input. In addition, the constituent elements of each of the above embodiments may be appropriately combined, or a part thereof may be replaced.

[0072] It should be noted that the present invention can be implemented in various other forms without departing from the gist or main characteristic power thereof. For this reason, 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. In addition, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

[0073] This application claims priority based on Japanese Patent Application No. 2005-257000 filed in Japan on September 5, 2005. The contents of which are hereby incorporated by reference into this application. In addition, all references cited in this specification are specifically incorporated by reference. Industrial applicability

The present invention is suitable for a security sensor that detects an intruder into a detection area and issues an alarm.

Claims

The scope of the claims

[1] Transmits microwaves toward the detection area, receives the reflected waves from the objects present in the detection area, and outputs distance information corresponding to the distance to the object. A microwave sensor that outputs vertical angle information corresponding to the direction of the object,

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, a detection target object exists in the detection area. Detection target object presence determining means for determining that

Warning signal output control means for controlling to output a warning signal when it is determined by the detection target object presence determination means that a detection target object exists;

An intrusion detection sensor comprising:

[2] In the intrusion detection sensor according to claim 1,

The microwave sensor transmits a plurality of microphone mouth waves having different frequencies toward the detection area, receives reflected waves of the microwaves from objects existing in the detection area, and transmits the distance information. An intrusion detection sensor characterized in that

[3] In the intrusion detection sensor according to claim 1 or 2,

The microwave sensor further includes:

A direction variable antenna device capable of changing a vertical angle of the transmission / reception direction of the microwave, and instructing the direction variable antenna device to scan the transmission / reception direction within a predetermined angle range and during the scanning, Scanning measuring means for monitoring distance information and obtaining the vertical angle information based on the result;

An intrusion detection sensor comprising:

[4] In the intrusion detection sensor according to claim 1 or 2,

An intrusion detection 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.

[5] In the intrusion detection sensor according to claim 1 or 2,

The intrusion detection sensor, wherein the variable direction antenna device is a phased array antenna.

[6] In the intrusion detection sensor according to claim 1 or 2,

The intrusion detection sensor, wherein the microwave sensor obtains the vertical angle information by a monopulse method using a plurality of antennas for reception.

[7] The intrusion detection sensor according to claim 6,

The intrusion detection sensor characterized in that the microwave sensor obtains the vertical angle information by an amplitude comparison monopulse method using a plurality of antennas in which a part of beams overlap for reception.

[8] In the intrusion detection sensor according to claim 6,

The intrusion detection sensor characterized in that the monopulse method in the microwave sensor is a phase comparison monopulse method.

[9] Transmits microwaves toward the detection area, receives the reflected waves of the microwaves from objects existing in the detection area, and outputs distance information corresponding to the distance to the object. A microwave sensor that outputs vertical angle information corresponding to the direction of the object,

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 when the height information of the object is within a predetermined height range, Detection target object presence determination means for determining that a detection target object exists in the detection area;

An intrusion detection sensor comprising:

[10] In the intrusion detection sensor according to claim 9,

It further comprises an inclination input means for inputting the inclination of the posture in the installed state, and the detection target object presence determining means is configured to detect the information input by the inclination input means, the distance information, and the vertical angle information. An intrusion detection sensor characterized in that the height information of the object is obtained based on the height information.

[11] In the intrusion detection sensor according to claim 10,

The intrusion detection sensor, wherein the tilt input means is an angle sensor.

[12] The intrusion detection sensor according to claim 10,

The intrusion detection sensor, wherein the tilt input means is a switch.

[13] In the intrusion detection sensor according to claim 10,

The intrusion detection sensor, wherein the tilt input means is a volume.

[14] In the intrusion detection sensor according to claim 9,

Further comprising a height range input means,

The intrusion detection sensor, wherein the detection target object presence determination means determines the predetermined height range based on information input by the height range input means.

[15] The intrusion detection sensor according to claim 14,

The intrusion detection sensor, wherein the height range input means is a DIP switch.