JP2007048320A - Crime-prevention sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crime-prevention sensor capable of preventing the generation of erroneous information as much as possible and enhancing the reliability of operation by prohibiting detection in a specific direction and by making detection sensitivity changeable depending on a direction. <P>SOLUTION: This crime-prevention sensor is provided with: a microwave sensor 320 for outputting distance information corresponding to a distance to an object present in a detection area; a direction-variable antenna device 310; a scanning measurement means 331; an object movement distance recognition means 336; a detection object presence determination means 332; a passive type infrared sensor 140; a direction storage means 335; and an alarm signal output means 333. When the difference between a direction in which the object found by the scanning measurement means 331 is present and a direction corresponding to any of detection restriction direction data stored in the direction storage means 335 is within a predetermined range, a threshold used for determining whether the detection object is present or not in the detection object presence determination means 332 is changed to a larger value. <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, a type of microwave sensor has been proposed in which a distance to a detection target object such as a human body existing in a detection area is measured using a plurality of microwaves having different frequencies. 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.

  By the way, when this type of sensor is used as a security sensor and the change in the phase difference over time is recognized so that only the detection target object moving in the detection area is recognized, the following is performed. There was a serious problem. For example, when installed outdoors, the vegetation may be misdetected as an object to be detected due to shaking of the vegetation due to the wind, and a false alarm may be generated. Similarly, when installed indoors, objects other than the human body (non-detection target objects) are detected by rotating the fan for ventilation, shaking of the blinds and curtains by the wind, or vibration of the microwave sensor itself. There was a possibility that it would be erroneously detected due to false detection of the target object.

  Therefore, the inventor of the present invention has already proposed a technique for accurately discriminating between a detection target object such as a human body and a non-detection target object other than a human body to avoid false reports (see Patent Document 2).

This proposal measures the amount of change per unit time of the relative distance to an object existing in the detection area based on each reflected wave, and detects that object only when the amount of change is equal to or greater than a predetermined threshold. It is determined that the object is a target object. In other words, the moving distance of plants and plants that are swaying by the wind is small, but the moving distance is large for detection target objects such as human bodies. Whether or not it is determined accurately. In the following description, such a false alarm prevention measure will be referred to as a “vegetation measure”, and the above threshold will be referred to as a “vegetation measure level”.
JP 7-37176 A JP 2003-207462 A

  However, in the microwave sensor as described above, since a transmission / reception antenna having a relatively wide directivity is used with its transmission / reception direction fixed, an intruder or the like that is an original detection target object is not necessarily accurately detected. There was a possibility that it could not be done. For example, it may be affected by the approach of rain, insects, etc., the location of installation or the vibration of the microwave sensor itself, and may cause false alarms.

  In addition, since the direction in which the detection target object exists cannot be recognized, even if there is a vegetation swaying by the wind or a rotating fan only in a specific direction, As a result, the sensitivity of the microwave sensor in all directions is reduced. Furthermore, even if it is found that there is something that may cause a false detection in a specific direction at the installation location at the time of installation, only a limited measure of adjusting the direction of the entire detection area is possible. It was.

  In view of such problems of the prior art, the object of the present invention is to influence the built-in microwave sensor due to the influence of vibration of the vegetation by wind, vibration of the microwave sensor itself, or insects approaching the microwave sensor. It is to provide a crime prevention sensor that can increase the reliability of operation by preventing the occurrence of false alarms as much as possible, and prohibiting detection in a specific direction or changing detection sensitivity depending on the direction. .

  In order to achieve the above object, the security sensor of the present invention transmits a plurality of microwaves having different frequencies toward a detection area, and receives a reflected wave of each of the microwaves from an object present in the detection area. A microwave sensor for outputting distance information corresponding to the distance to the object, a direction variable antenna device capable of changing the transmission / reception directions of the plurality of microwaves by the microwave sensor within a predetermined angle range, and the direction By instructing the variable antenna device to scan within the predetermined angle range in the transmission / reception direction and monitoring the distance information during the scanning, the direction in which the object exists and the detected object distance information to the object are obtained. Based on the scanning measurement means to be obtained and the temporal change in the detected object distance information, the unit time movement distance of the object is obtained. Body movement distance recognition means and detection target object existence determination for determining that a detection target object exists in the detection area if the unit time movement distance obtained by the object movement distance recognition means is equal to or greater than a predetermined threshold. And a passive infrared sensor that receives infrared rays from the detection area and outputs an infrared detection signal indicating the presence of the detection target object in the detection area based on a temperature difference from the surroundings, and the detection target object presence The direction in which the object determined by the scanning measurement unit exists when the determination unit determines that the detection target object exists and the infrared detection signal is not output from the passive infrared sensor Is detected as the detection restriction direction information, and the detection target object is determined to be present by the detection target object presence determination means. A warning signal output control means for controlling to output a warning signal when the infrared detection signal is output from the passive infrared sensor, and the object obtained by the scanning measurement means is If the difference between the existing direction and the direction corresponding to any of the detection limit direction information stored in the direction storage unit is within a predetermined range, the detection target object exists in the detection target object presence determination unit. The predetermined threshold value used for determining whether or not there is a change is changed to a larger value.

  Here, when the state in which the detection target object is not determined to be present by the detection target object presence determination unit continues for a predetermined period, the detection limit direction information stored in the direction storage unit is deleted. May be. Moreover, as a direction variable antenna apparatus, although a phased array antenna is mentioned, for example, it is not restricted to this.

  According to the security sensor having such a configuration, it is possible to suppress false detection by automatically reducing the substantial detection sensitivity in a direction in which it is determined that a factor causing erroneous detection exists, and in other directions It is possible to maintain the same high sensitivity as usual, and it is possible to reduce false alarms and improve operation requestability.

  Alternatively, the security sensor of the present invention transmits a plurality of microwaves having different frequencies toward the detection area, receives each reflected wave from the object existing in the detection area, and reaches the object. A microwave sensor that outputs distance information corresponding to the distance of the direction, a direction variable antenna device that can change the transmission and reception directions of the plurality of microwaves within a predetermined angle range by the microwave sensor, and the direction variable antenna device Scanning measuring means for instructing scanning within the predetermined angle range in the transmission / reception direction and monitoring the distance information during the scanning to obtain a direction in which the object exists and detected object distance information to the object; Based on the change in the detected object distance information over time, the object movement distance recognition is performed to obtain the unit time movement distance of the object. A detection target object presence determination unit that determines that a detection target object is present in the detection area if the unit time movement distance obtained by the object movement distance recognition unit is equal to or greater than a predetermined threshold; A direction input unit that inputs a direction excluded from the target as detection exclusion direction information, and a case where the detection target object is determined to be present by the detection target object presence determination unit, and is obtained by the scanning measurement unit And a warning signal output control unit that controls to output a warning signal when the direction in which the object exists does not correspond to any of the detection exclusion direction information input by the direction input unit. Also good.

  Here, the scanning measurement unit may exclude a direction corresponding to any of the detection exclusion direction information input by the direction input unit from a scanning target. Moreover, as a direction variable antenna apparatus, although a phased array antenna is mentioned, for example, it is not restricted to this. The direction input means includes a dip switch, but is not limited thereto.

  According to the security sensor having such a configuration, detection of a direction in which a factor causing erroneous detection is determined or a direction in which detection is unnecessary can be prohibited in advance by a manual setting operation or the like. As a result, not only can false errors be further reduced, but flexible utilization is possible depending on the installation status and purpose of use.

  Further, in the security sensor, a passive infrared sensor that receives infrared rays from the detection area and outputs an infrared detection signal indicating the presence of a detection target object in the detection area based on a temperature difference from the surroundings. The warning signal output control means may not output the warning signal when the infrared detection signal is not output from the passive infrared sensor.

  Further, in the security sensor, the warning signal output control means is irrelevant to the determination result by the detection target object presence determination means when all directions are input as detection exclusion direction information by the direction input means. The warning signal may be output when the infrared detection signal is output from the passive infrared sensor.

  Alternatively, the security sensor of the present invention transmits a plurality of microwaves having different frequencies toward the detection area, receives each reflected wave from the object existing in the detection area, and reaches the object. A microwave sensor that outputs distance information corresponding to the distance of the direction, a direction variable antenna device that can change the transmission and reception directions of the plurality of microwaves within a predetermined angle range by the microwave sensor, and the direction variable antenna device Scanning measuring means for instructing scanning within the predetermined angle range in the transmission / reception direction and monitoring the distance information during the scanning to obtain a direction in which the object exists and detected object distance information to the object; Based on the change in the detected object distance information over time, the object movement distance recognition is performed to obtain the unit time movement distance of the object. A detection target object presence determination unit that determines that a detection target object is present in the detection area if the unit time movement distance obtained by the object movement distance recognition unit is equal to or greater than a predetermined threshold; A position input means for inputting a two-dimensional position excluded from the area as detection exclusion position information, and a case where the detection target object is determined to be present by the detection target object presence determination means, and the scanning measurement means Warning signal output for controlling to output a warning signal when the direction in which the obtained object exists and the distance to the object do not correspond to any of the detection exclusion position information input by the position input means It is good also as providing a control means.

  Here, the two-dimensional position may be a polar coordinate system or an orthogonal coordinate system defined by a direction and a distance. Moreover, as a direction variable antenna apparatus, although a phased array antenna is mentioned, for example, it is not restricted to this. The direction input means includes a dip switch, but is not limited thereto.

  Further, in the security sensor, a passive infrared sensor that receives infrared rays from the detection area and outputs an infrared detection signal indicating the presence of a detection target object in the detection area based on a temperature difference from the surroundings. The warning signal output control means may not output the warning signal when the infrared detection signal is not output from the passive infrared sensor.

  Alternatively, the security sensor of the present invention transmits a plurality of microwaves having different frequencies toward the detection area, receives each reflected wave from the object existing in the detection area, and reaches the object. A microwave sensor that outputs distance information corresponding to the distance of the direction, a direction variable antenna device that can change the transmission and reception directions of the plurality of microwaves within a predetermined angle range by the microwave sensor, and the direction variable antenna device Scanning measuring means for instructing scanning within the predetermined angle range in the transmission / reception direction and monitoring the distance information during the scanning to obtain a direction in which the object exists and detected object distance information to the object; Based on the change in the detected object distance information over time, the object movement distance recognition is performed to obtain the unit time movement distance of the object. A detection target object presence determination unit that determines that a detection target object exists in the detection area if the unit time movement distance obtained by the object movement distance recognition unit is equal to or greater than a predetermined threshold; Detected by a passive infrared sensor that receives an infrared ray from the detection area and outputs an infrared detection signal indicating the presence of a detection target object in the detection area based on a temperature difference from the surroundings, and the detection target object presence determination unit When it is determined that a target object is present and the infrared detection signal is not output from the passive infrared sensor, the direction of the object determined by the scanning measurement unit and the object The position storage means for storing the distance as two-dimensional detection limit position information, and the detection target object exists by the detection target object presence determination means. And a warning signal output control means for controlling to output a warning signal when the infrared detection signal is output from the passive infrared sensor. If the obtained direction in which the object exists and the distance to the object correspond to any of the detection limit position information stored in the position storage unit, the detection target object in the detection target object presence determination unit The predetermined threshold value used for determining whether or not there is a change may be changed to a larger value.

  Alternatively, the security sensor of the present invention transmits a plurality of microwaves having different frequencies toward the detection area, receives each reflected wave from the object existing in the detection area, and reaches the object. A microwave sensor that outputs distance information corresponding to the distance of the direction, a direction variable antenna device that can change the transmission and reception directions of the plurality of microwaves within a predetermined angle range by the microwave sensor, and the direction variable antenna device Scanning measuring means for instructing scanning within the predetermined angle range in the transmission / reception direction and monitoring the distance information during the scanning to obtain a direction in which the object exists and detected object distance information to the object; Based on the change in the detected object distance information over time, the object movement distance recognition is performed to obtain the unit time movement distance of the object. A detection target object presence determination unit that determines that a detection target object is present in the detection area if the unit time movement distance obtained by the object movement distance recognition unit is equal to or greater than a predetermined threshold; A distance input means for inputting a distance range excluded from the area as detection exclusion distance information, and a case where the detection target object is determined to be present by the detection target object presence determination means, and obtained by the scanning measurement means. Warning signal output control means for controlling to output a warning signal when the distance to the object does not correspond to any of the detection exclusion distance information input by the distance input means. It is good. Further, the alarm signal output control includes a passive infrared sensor that receives an infrared ray from the detection area and outputs an infrared detection signal indicating the presence of a detection target object in the detection area based on a temperature difference from the surroundings. The means may not output the warning signal when the infrared detection signal is not output from the passive infrared sensor.

  Alternatively, the security sensor of the present invention transmits a plurality of microwaves having different frequencies toward the detection area, receives each reflected wave from the object existing in the detection area, and reaches the object. A microwave sensor that outputs distance information corresponding to the distance of the object, an object movement distance recognizing unit that obtains a unit time moving distance of the object based on a temporal change of the distance information, and obtained by the object movement distance recognizing unit. Detection target object presence determining means for determining that a detection target object exists in the detection area if the unit time travel distance is equal to or greater than a predetermined threshold, and detection exclusion distance information indicating a distance range to be excluded from the detection area And when the detection target object is determined to be present by the distance input means and the detection target object presence determination means, Warning signal output control means for controlling to output a warning signal when the distance to the detection target object does not correspond to any of the detection exclusion distance information input by the distance input means. It may be a feature. Further, the alarm signal output control includes a passive infrared sensor that receives an infrared ray from the detection area and outputs an infrared detection signal indicating the presence of a detection target object in the detection area based on a temperature difference from the surroundings. The means may not output the warning signal when the infrared detection signal is not output from the passive infrared sensor.

  According to the security sensor of the present invention, it is possible to suppress the influence of rain, insects, etc., the installation location and the vibration of the security sensor itself, and avoid false alarms as much as possible. be able to. Furthermore, the operation reliability can be further improved by prohibiting the detection in a specific direction or changing the detection sensitivity depending on the direction.

  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 this figure, a security sensor 100 includes a phased array antenna 110 that can change the transmission / reception direction of microwaves, and a microwave sensor 120 that detects a detection target object such as a human body using the phased array antenna 110. And a one-chip microcomputer 130 for controlling them.

  The phased array antenna 110 includes a plurality of antenna elements 111 arranged at equal intervals in the same direction, and a phase shift control circuit 112 that controls a phase shift amount in a signal transmission path between these antenna elements 111 within a predetermined range. And have. Note that the directivity of the phased array antenna 110 is preferably narrow. The phase shift control circuit 112 is of a type in which the transmission / reception direction is continuously variable by continuously changing the phase shift amount.

  The microwave sensor 120 is a type that transmits and receives a single-frequency microwave, and transmits the microwave from the phased array antenna 110 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 toward the phased array antenna 110. The microwave sensor 120 is configured to output a reflected wave reception intensity signal such that the voltage increases as the reception intensity of the received microwave increases.

  The one-chip microcomputer 130 instructs the phase shift control circuit 112 to control the amount of phase shift, and monitors the reflected wave reception intensity signal output from the microwave sensor 120, and the scan measurement unit 131. A detection target object presence determination unit 132 that determines whether or not a detection target object exists based on the measurement result of the above, and controls the output of the warning signal Dout1 based on the determination result of the detection target object presence determination unit 132 A warning output control unit 133. The scanning measurement unit 131, the detection target object presence determination unit 132, and the warning output control unit 133 are realized by embedded software of the one-chip microcomputer 130, but the implementation method is not limited to software.

  The output format of the warning signal Dout1 of the warning output control unit 133 is open drain or open collector. The output of the warning signal Dout1 is ON when the detection target object presence determination unit 132 determines that the detection target object exists, and is open when it is determined that the detection target object does not exist. Shall.

  FIG. 2 is an explanatory diagram of the antenna swing angle θ indicating the transmission / reception direction by the phased array antenna 110 of the security sensor 100. FIG. 3 is an example of a measurement result by the scanning measurement unit 131 of the security sensor 100. (a) shows a case where a human body is detected, (b) shows a case where it is affected by rain or vibration, and (c ) Shows the case where an insect approaches.

  Here, as shown in FIG. 2, the antenna swing angle θ is defined as an angle in the transmission / reception direction with the front direction of the security sensor 100 as a reference. The phased array antenna 110 can change the transmission / reception direction according to the phase shift amount controlled by the phase shift control circuit 112, and the antenna swing angle θ has a width of the same angle in the positive direction and the negative direction centering on 0 degree. Have.

  The scanning measurement unit 131 of the one-chip microcomputer 130 continuously receives the reflected wave reception intensity signal output from the microwave sensor 120 during the period while continuously instructing the phase shift control circuit 112 to change the phase shift amount. Monitor and remember. Such measurement is repeated. As a result, for example, measurement results as shown in FIGS. 3A to 3C are obtained.

  FIG. 3A shows an example in which a human body at a long distance is detected, and a sharp peak centered in the direction in which the human body exists is seen. The level drops rapidly when moving left and right from the peak, and becomes a substantially constant low level when sufficiently separated.

  On the other hand, FIG. 3B is an example in the case of being affected by rain or vibration, and there is not any object having a certain size in a specific direction. Although it fluctuates irregularly within a certain level, no particular peak is observed.

  FIG. 3C is an example of a case where a small insect or the like is approaching or sticking close to the antenna, and the directivity of the phased array antenna 110 is not sufficiently exhibited. In comparison with), only a very gentle peak is seen.

  Thus, although the measurement result varies greatly depending on the detected object, it is necessary to accurately determine whether or not the detection target object exists based on the measurement result by the detection target object presence determination unit 132.

  Therefore, the “omnidirectional power” obtained by integrating the voltage output as the reflected wave reception intensity signal from the microwave sensor 120 over the entire range in the transmission / reception direction is set to the voltage at the peak position in the measurement result by the scanning measurement unit 131. The ratio of the corresponding “peak power” is defined as “peak quality” as follows: When the peak quality is equal to or higher than a predetermined value, it is determined that the detection target object exists.

なお、ピーククオリティーが所定値以上ということは、「全方向電力」に対して「ピーク電力」が所定比率以上であると言い換えることもできる。

In addition, it can be paraphrased that peak quality is more than a predetermined value that "peak power" is more than a predetermined ratio with respect to "omnidirectional power".

  According to the configuration of the first embodiment as described above, it is possible to suppress the influence of rain, insects and the like, the installation location and the vibration of the security sensor itself, and avoid false alarms as much as possible. Can improve the reliability.

<Modification of First Embodiment>
FIG. 4 is a block diagram showing a schematic configuration of a security sensor 100A in which the reliability of operation is further improved by combining a passive infrared sensor (PIR sensor) as a modification of the security sensor 100 according to the first embodiment. . Hereinafter, differences from the first embodiment will be described.

  As shown in FIG. 4, in addition to the components of the first embodiment, the security sensor 100A receives infrared rays from within the detection area, and a signal (indicating the presence or absence of a detection target object based on a temperature difference from the surroundings) A passive infrared sensor 140 that outputs a high level when a detection target object is present and a low level when a detection target object is not present is provided.

  Further, the one-chip microcomputer 130A is different in that the output of the passive infrared sensor 140 is connected to the warning output control unit 133A, and the output of the passive infrared sensor 140 is taken into account in controlling the output of the warning signal Dout1. .

  Specifically, even when the detection target object presence determination unit 132 determines that the detection target object exists, the output from the passive infrared sensor 140 indicates that the detection target object does not exist. When it is at the low level, it is determined that the microwave sensor 120 is erroneously detected for some reason, and the output of the warning signal Dout1 is not turned ON and the open state is maintained.

  According to the above configuration, it is possible to suppress the influence of rain, insects, etc., the installation location and the vibration of the security sensor itself, and avoid false alarms as much as possible. By using in combination, the reliability of the detection operation can be further increased.

Second Embodiment
FIG. 5 is a block diagram showing a schematic configuration of a security sensor 200 according to the second embodiment of the present invention. In addition, since it is the same as that of the modification of 1st Embodiment except the point described below, suppose that the same referential mark is attached | subjected to the same component and it mainly demonstrates a difference.

  As shown in FIG. 5, the difference between the security sensor 200 and the security sensor 100 </ b> A is a component of the one-chip microcomputer 230. In other words, the detection target object direction specifying unit 234 and the detection prohibition direction storage unit 235 are added, and the detection target object direction specifying unit 234 and the detection prohibition direction storage are used for controlling the output of the warning signal Dout2 by the warning output control unit 233. The output of the unit 235 is taken into account. Further, since the output of the passive infrared sensor 140 needs to be referred to other than the warning output control unit 233, the output is connected to the one-chip microcomputer 230 instead of directly to the warning output control unit 233.

  The detection target object direction specifying unit 234 searches for the peak position in the measurement result by the scanning measurement unit 131, obtains a direction corresponding to the peak position, and transmits the obtained direction to the warning output control unit 233. Even when the detection target object presence determination unit 132 determines that the detection target object exists, the output from the passive infrared sensor 140 is at a low level indicating that the detection target object does not exist. In some cases, it is determined that there is a factor causing erroneous detection of the microwave sensor 120 in that direction, and that direction is stored in the detection prohibited direction storage unit 235 as detection prohibited direction information.

  The detection prohibition direction storage unit 235 transmits the detection prohibition direction information to the warning output control unit 233. Note that the detection prohibition direction storage unit 235 may store not only one detection prohibition direction information but also a plurality of detection prohibition direction information. Further, when the state in which the detection target object presence determination unit 132 determines that the detection target object does not exist continues for a predetermined time or longer, the detection prohibition direction information may be automatically deleted.

  Even when the detection target object presence determination unit 132 determines that the detection target object exists, the warning output control unit 233 sets the output of the warning signal Dout2 to ON under any of the following conditions: Keep open without doing. The first condition is when the output from the passive infrared sensor 140 is at a low level indicating that the detection target object does not exist, and the second condition is the direction obtained by the detection target object direction specifying unit 234. Is when the difference from any of the detection prohibition direction information stored in the detection prohibition direction storage unit 235 is a predetermined slight difference.

  According to the configuration of the second embodiment as described above, it is possible to suppress the influence due to the approach of rain, insects, etc., the vibration of the installation location and the security sensor itself, and avoid false alarms as much as possible. In combination with the infrared sensor, the reliability of the operation can be improved, and the detection of the direction in which it is judged that there is a factor causing the erroneous detection is automatically prohibited to further reduce the false alarm. be able to.

<Third Embodiment>
FIG. 6 is a block diagram showing a schematic configuration of a security sensor 300 according to the third embodiment of the present invention. Note that the same reference numerals are given to the same components as those in the above-described embodiments, and differences will be mainly described.

  As shown in FIG. 6, the security sensor 300 includes a phased array antenna 310 that can change the transmission / reception direction of microwaves, and a microwave sensor that detects a detection target object such as a human body using the phased array antenna 310. 320, a passive infrared sensor 140, and a one-chip microcomputer 330 for controlling them.

  The phased array antenna 310 includes a plurality of antenna elements 311 arranged at equal intervals in the same direction, and a phase shift control circuit 312 that controls a phase shift amount in a signal transmission path between these antenna elements 311 within a predetermined range. And have. Note that the directivity of the phased array antenna 110 is preferably narrow. Further, unlike the phased array antenna 110 of the first embodiment or the like, it is assumed that the transmission / reception direction can be selected from a plurality of directions by setting one of a plurality of phase shift amounts.

  The microwave sensor 320 is of a type that transmits and receives microwaves of two different frequencies, and transmits the microwaves from the phased array antenna 310 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 toward the phased array antenna 310. The microwave sensor 320 is configured to detect a phase difference between the two IF signals based on the received reflected waves and to output a detected object distance signal based on the phase difference.

  The one-chip microcomputer 330 includes a scanning measurement unit 331, an object movement distance recognition unit 336, a detection target object presence determination unit 332, a detection limit direction storage unit 335, and a warning output control unit 333. These are realized by the embedded software of the one-chip microcomputer 330, but the realization method is not limited to software.

  The scanning measurement unit 331 instructs the phase shift control circuit 312 to control the amount of phase shift and monitors the detected object distance signal output from the microwave sensor 320 to detect the direction in which the detected object exists and the detected object. Find distance information.

  The object moving distance recognizing unit 336 obtains the moving distance of the detected object in unit time based on the temporal change of the distance information to the detected object obtained by the scanning measuring unit 331.

  The detection target object presence determination unit 332 compares the movement distance of the detection object obtained by the object movement distance recognition unit 336 with a predetermined threshold value (plant countermeasure level), and if it is less than the plant countermeasure level, it is shaken by the wind. Judged as plants. Even when the moving distance of the detected object is equal to or greater than the grass countermeasure level, if the output from the passive infrared sensor 140 is at a low level indicating that the detection target object does not exist, the microwave sensor 320 is caused by some factor. Is determined to be misdetecting. The direction in which the detected object output from the scanning measurement unit 331 is present is stored in the detection limit direction storage unit 335 as detection limit direction information so that the same erroneous detection can be suppressed in the subsequent detection operation. When the moving distance of the detected object is equal to or greater than the grass and plant countermeasure level and the output from the passive infrared sensor 140 is also at the high level, it is determined that an object to be detected such as an intruder actually exists.

  As for the above-mentioned grass countermeasure level, if the direction in which the detected object output from the scanning measurement unit 331 exists corresponds to any of the detection limit direction information already stored in the detection limit direction storage unit 335, Judgment is made using a higher value than usual. As a result, the detection sensitivity is substantially lowered for the direction in which it is determined that the cause of the erroneous detection exists, and the erroneous detection is suppressed, and the detection sensitivity is not lowered for the other directions.

  When the detection target object presence determination unit 332 determines that the detection target object does not exist for a predetermined time or longer, the detection limit direction information stored in the detection limit direction storage unit 335 is automatically used. It may be deleted.

  The output format of the warning signal Dout3 of the warning output controller 333 is open drain or open collector. The output of the warning signal Dout3 is ON when the detection target object presence determination unit 332 determines that the detection target object exists, and is open when it is determined that the detection target object does not exist. .

  According to the configuration of the third embodiment as described above, erroneous detection can be suppressed by automatically reducing the substantial detection sensitivity in a direction in which a factor causing erroneous detection is present, and the other As for the direction, the same high sensitivity as usual can be maintained, and it is possible to reduce false alarms and improve operation requestability.

<Fourth embodiment>
FIG. 7 is a block diagram showing a schematic configuration of a security sensor 400 according to the fourth embodiment of the present invention. In addition, since it is the same as that of 3rd Embodiment except the point described below, and also a part of difference is common in the other embodiment mentioned above, suppose that the same referential mark is attached | subjected to the same component, The difference will be mainly described.

  As shown in FIG. 7, the security sensor 400 includes a phased array antenna 310 that can change the transmission / reception direction of microwaves, and a microwave sensor that detects a detection target object such as a human body using the phased array antenna 310. 320, a one-chip microcomputer 430 for controlling these, and a DIP switch 450 serving as information input means to this one-chip microcomputer 430.

  As shown in FIG. 8, the security sensor 400 is installed so as to form a detection area along the wall 10 from the lateral direction of the window 11 so that an intruder 12 from the window 11 of the building can be detected. It shall be. The detection area is divided into seven directions (A to G).

  The DIP switch 450 has the same number of seven switch elements as the detection area. By turning on each switch element, the detection result in the corresponding direction of the detection area is treated as invalid. In addition, in order to make it easy to understand the correspondence between each direction of the detection area and each switch element of the DIP switch 450, the DIP switch 450 is arranged in the security sensor 400 in a direction that exactly corresponds to the seven directions of the detection area. Has been. For example, the rightmost switch element of the DIP switch 450 corresponds to the rightmost direction G of the detection area. This facilitates work such as installation and adjustment.

  The one-chip microcomputer 430 includes a scanning measurement unit 331, an object movement distance recognition unit 336, a detection target object presence determination unit 432, and a warning output control unit 433. The difference between the detection target object presence determination unit 432 and the detection target object presence determination unit 332 is that the detection target object presence determination unit 432 does not have an access function to the detection limit direction storage unit 335.

  Even when the detection target object presence determination unit 432 determines that the detection target object exists, the warning output control unit 433 determines the direction in which the detection object output from the scanning measurement unit 331 exists. When it corresponds to the direction set to prohibit the detection by the DIP switch 450, the output of the warning signal Dout4 is not turned ON but the open state is maintained.

  When installed as shown in FIG. 8, for example, an indoor person or the like is detected through the window 11 or the wall 10, and as a result, erroneous detection may occur, but the direction corresponding to the direction of the window 11 If F / G detection is prohibited in advance by setting the DIP switch 450, such erroneous detection can be prevented. In addition, the direction to be detected can be freely limited depending on the installation status and the purpose of use.

  According to the configuration of the fourth embodiment as described above, detection of a direction in which a factor causing erroneous detection is determined or a direction in which detection is unnecessary can be prohibited in advance by a manual setting operation or the like. . As a result, not only can false errors be further reduced, but flexible utilization is possible depending on the installation status and purpose of use.

<Fifth Embodiment>
FIG. 9 is a block diagram showing a schematic configuration of a security sensor 500 according to the fifth embodiment of the present invention. In addition, since it is the same as that of 4th Embodiment except the point described below, and also a part of difference is common with the above-mentioned other embodiment, suppose that the same referential mark is attached | subjected to the same component, The difference will be mainly described.

  As shown in FIG. 9, the security sensor 500 includes a phased array antenna 310 that can change the transmission / reception direction of microwaves, and a microwave sensor that detects a detection target object such as a human body using the phased array antenna 310. 320, a passive infrared sensor 140, a one-chip microcomputer 530 for controlling them, and a DIP switch 450 serving as information input means to the one-chip microcomputer 530.

  The one-chip microcomputer 530 includes a scanning measurement unit 531, an object movement distance recognition unit 336, a detection target object presence determination unit 432, and a warning output control unit 533.

  The scanning measurement unit 531 instructs the phase shift control circuit 312 to control the amount of phase shift and monitors the detected object distance signal output from the microwave sensor 320 to detect the direction in which the detected object exists and the detected object. Find distance information. However, directions set to prohibit detection by the DIP switch 450 are excluded from the target. Thereby, the detection operation | movement of an unnecessary direction can be abolished, and a detection operation | movement can be performed only in a required direction.

  The warning output control unit 533 confirms that the output from the passive infrared sensor 140 does not exist even if the detection target object presence determination unit 432 determines that the detection target object exists. When the output signal is at a low level, the output of the warning signal Dout5 is not turned ON and the open state is maintained.

  If all switch elements of the DIP switch 450 are erroneously set to ON, detection by the microwave sensor 320 is not performed in any direction of the detection area, and the function as the security sensor 500 is impaired. Therefore, when the warning output control unit 533 detects that all the switch elements of the DIP switch 450 are set to ON, the warning signal Dout5 is controlled according to only the output from the passive infrared sensor 140. . That is, if the output from the passive infrared sensor 140 is high level, the output of the warning signal Dout5 is turned ON, and if the output from the passive infrared sensor 140 is low level, the output of the warning signal Dout5 is kept open. .

<Sixth Embodiment>
FIG. 10 is a block diagram showing a schematic configuration of a security sensor 600 according to the sixth embodiment of the present invention. Note that, except for the points described below, this embodiment is the same as the fourth embodiment and the fifth embodiment, and some of the differences are also common to the other embodiments described above. The difference will be mainly described.

  As shown in FIG. 10, the security sensor 600 includes a phased array antenna 310 that can change a microwave transmission / reception direction, and a microwave sensor that detects a detection target object such as a human body using the phased array antenna 310. 320, a passive infrared sensor 140, a one-chip microcomputer 630 for controlling them, and a DIP switch 650 serving as information input means to the one-chip microcomputer 630.

  The one-chip microcomputer 630 includes a scanning measurement unit 531, an object movement distance recognition unit 336, a detection target object presence determination unit 432, and a warning output control unit 633. In addition, the direction in which the detected object exists and the distance information to the detected object, which are obtained by the scanning measurement unit 531, are also transmitted to the warning output control unit 633.

  As a result, the warning output control unit 633 can recognize the two-dimensional position of the detected object as the direction and the distance, so that the same functions as those in the fourth embodiment and the fifth embodiment can be extended two-dimensionally. . For example, as shown in FIG. 11, the detection area is previously divided into a plurality of sub detection areas by a combination of direction and distance, and the DIP switch 650 has a switch element corresponding to the number of sub detection areas. Use it.

<Other variations>
The direction and distance, which are the two-dimensional position of the sensing object in the sixth embodiment, can be easily converted to an orthogonal coordinate system. Therefore, by adding such a coordinate conversion function to the sixth embodiment, the detection area can be divided as shown in FIG.

  In this case, since the correspondence between each switch element of the DIP switch and the arrangement of the sub detection areas becomes easy to understand, installation and adjustment work are facilitated.

  Further, depending on the installation location and purpose of use, for example, as shown in FIG. 13, the detection area may be divided into a plurality of sub detection areas (A1 to A4) based on only the distance without being divided according to the direction. In this case, the sub-detection areas (A2, A4) corresponding to the distance in which there are plants and the like that can cause erroneous detection are configured to be invalidated by setting the DIP switch or the like. Alternatively, instead of invalidating the corresponding sub-detection area, a configuration may be adopted in which countermeasures against vegetation are strengthened (substantial sensitivity is lowered) as in the third embodiment.

  If the detection area is divided into a plurality of sub-detection areas based only on the distance, the configuration can be simplified as compared with the sixth embodiment. Specifically, the phased array antenna 310 is replaced with a normal antenna, and the scanning measurement unit 531 is omitted, and the object movement distance recognition unit 336 directly monitors the distance information output from the microwave sensor 320. Good. Furthermore, the passive infrared sensor 140 can be omitted as necessary.

  Even with such a simplified configuration, the division based only on the distance of the detection area as shown in FIG. 13 can be realized.

  Of course, the configuration for recognizing the two-dimensional position of the detected object may be combined with the countermeasure against the vegetation as in the third embodiment.

  The present invention can be implemented in various other forms without departing from the spirit or main features thereof. Therefore, the above-mentioned embodiment is only a mere illustration in all points, and should not be interpreted limitedly. 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 explanatory drawing of antenna swing angle (theta) which shows the transmission / reception direction by the phased array antenna of the security sensor which concerns on 1st Embodiment of this invention. It is an example of the measurement result by the scanning measurement part of the security sensor which concerns on 1st Embodiment of this invention, (a) shows the case where a human body is detected, (b) shows the case where it received the influence of rain or a vibration. , (C) shows a case where an insect approaches. It is a block diagram which shows schematic structure of the security sensor which concerns on the modification of 1st Embodiment of this invention. It is a block diagram which shows schematic structure of the security sensor which concerns on 2nd Embodiment of this invention. It is a block diagram which shows schematic structure of the security sensor which concerns on 3rd Embodiment of this invention. It is a block diagram which shows schematic structure of the security sensor which concerns on 4th Embodiment of this invention. It is explanatory drawing of the detection area division | segmentation of the security sensor which concerns on 4th Embodiment of this invention. It is a block diagram which shows schematic structure of the security sensor which concerns on 5th Embodiment of this invention. It is a block diagram which shows schematic structure of the security sensor which concerns on 6th Embodiment of this invention. It is explanatory drawing of the detection area division | segmentation of the security sensor which concerns on 6th Embodiment of this invention. It is explanatory drawing of the detection area division | segmentation of the security sensor which concerns on the modification of 6th Embodiment of this invention. It is explanatory drawing of the detection area division | segmentation of the security sensor which concerns on another modification of 6th Embodiment of this invention.

Explanation of symbols

100 Security sensor (first embodiment)
100A Security sensor (modified example of the first embodiment)
110 Phased Array Antenna 111 Antenna Element 112 Phase Shift Control Circuit 120 Microwave Sensor 130 One-Chip Microcomputer 130A One-Chip Microcomputer 131 Scanning Measurement Unit 132 Detection Object Existence Determination Unit 133 Warning Output Control Unit 133A Warning Output Control Unit 140 Passive Infrared Sensor 200 Security sensor (second embodiment)
230 One-chip microcomputer 233 Warning output control unit 234 Detection target object direction specifying unit 235 Detection prohibition direction storage unit 300 Security sensor (third embodiment)
310 phased array antenna 311 antenna element 312 phase shift control circuit 320 microwave sensor 330 one-chip microcomputer 331 scanning measurement unit 332 detection target object presence determination unit 333 warning output control unit 335 detection limit direction storage unit 336 object movement distance recognition unit 400 crime prevention Sensor (fourth embodiment)
430 One-chip microcomputer 432 Detection target object presence determination unit 433 Warning output control unit 450 DIP switch 500 Security sensor (fifth embodiment)
530 One-chip microcomputer 531 Scanning measurement unit 533 Warning output control unit 600 Security sensor (sixth embodiment)
630 One-chip microcomputer 633 Warning output control unit 650 DIP switch

Claims (21)

Transmits multiple microwaves with different frequencies to the detection area, receives the reflected waves from the objects in the detection area, and outputs distance information corresponding to the distance to the object A microwave sensor,
A direction variable antenna device capable of changing the transmission and reception directions of the plurality of microwaves by the microwave sensor within a predetermined angle range;
By instructing the variable direction antenna device to scan within the predetermined angle range in the transmission / reception direction and monitoring the distance information during the scanning, the direction in which the object exists and the detected object distance information to the object Scanning measurement means for obtaining
An object movement distance recognition means for obtaining a unit time movement distance of the object based on a temporal change in the detected object distance information;
A detection target object presence determination unit that determines that a detection target object is present in the detection area if the unit time movement distance obtained by the object movement distance recognition unit is equal to or greater than a predetermined threshold;
A passive infrared sensor that receives infrared rays from the detection area and outputs an infrared detection signal indicating the presence of a detection target object in the detection area based on a temperature difference with the surroundings;
When the detection target object is determined to be present by the detection target object presence determination unit and the infrared detection signal is not output from the passive infrared sensor, the scanning measurement unit obtains the detection target object. Direction storage means for storing the direction in which the object exists as detection limit direction information;
Control is performed to output a warning signal when the detection target object is determined by the detection target object presence determination means and the infrared detection signal is output from the passive infrared sensor. Warning signal output control means for
If the difference between the direction in which the object obtained by the scanning measurement unit exists and the direction corresponding to any of the detection limit direction information stored in the direction storage unit is within a predetermined range, the detection target object A security sensor, wherein the predetermined threshold value used to determine whether or not a detection target object exists in the presence determination means is changed to a larger value. The security sensor according to claim 1,
The detection limit direction information stored in the direction storage unit is deleted when a state in which the detection target object is not determined to be present by the detection target object presence determination unit continues for a predetermined period. Security sensor. The security sensor according to claim 1 or 2,
A security sensor, wherein the direction variable antenna device is a phased array antenna. Transmits multiple microwaves with different frequencies to the detection area, receives the reflected waves from the objects in the detection area, and outputs distance information corresponding to the distance to the object A microwave sensor,
A direction variable antenna device capable of changing the transmission and reception directions of the plurality of microwaves by the microwave sensor within a predetermined angle range;
By instructing the variable direction antenna device to scan within the predetermined angle range in the transmission / reception direction and monitoring the distance information during the scanning, the direction in which the object exists and the detected object distance information to the object Scanning measurement means for obtaining
An object movement distance recognition means for obtaining a unit time movement distance of the object based on a temporal change in the detected object distance information;
A detection target object presence determination unit that determines that a detection target object is present in the detection area if the unit time movement distance obtained by the object movement distance recognition unit is equal to or greater than a predetermined threshold;
Direction input means for inputting the direction excluded from the detection target as detection exclusion direction information;
The detection exclusion in which the direction in which the object obtained by the scanning measurement unit is present is input by the direction input unit when it is determined by the detection target object presence determination unit that the detection target object exists. A crime prevention sensor, comprising: a warning signal output control means for controlling to output a warning signal when not corresponding to any of the direction information. The crime prevention sensor according to claim 4,
The security measuring sensor, wherein the scanning measuring unit excludes a direction corresponding to any of the detection exclusion direction information input by the direction input unit from a scanning target. The security sensor according to claim 5,
Furthermore, the apparatus includes a passive infrared sensor that receives infrared rays from the detection area and outputs an infrared detection signal indicating the presence of a detection target object in the detection area based on a temperature difference with the surroundings.
The security sensor, wherein the warning signal output control means does not output the warning signal when the infrared detection signal is not output from the passive infrared sensor. The security sensor according to claim 6,
When all the directions are input as detection exclusion direction information by the direction input unit, the warning signal output control unit is configured to detect from the passive infrared sensor regardless of the determination result by the detection target object presence determination unit. A security sensor that controls to output the warning signal when the infrared detection signal is output. The security sensor according to any one of claims 4 to 7,
The security sensor, wherein the direction input means is a dip switch. The security sensor according to claim 8,
The security sensor according to claim 1, wherein the dip switches are arranged so as to correspond to the arrangement of directions in the detection area to which the respective switch elements correspond at the time of installation. The security sensor according to any one of claims 4 to 9,
A security sensor, wherein the direction variable antenna device is a phased array antenna. Transmits multiple microwaves with different frequencies to the detection area, receives the reflected waves from the objects in the detection area, and outputs distance information corresponding to the distance to the object A microwave sensor,
A direction variable antenna device capable of changing the transmission and reception directions of the plurality of microwaves by the microwave sensor within a predetermined angle range;
By instructing the variable direction antenna device to scan within the predetermined angle range in the transmission / reception direction and monitoring the distance information during the scanning, the direction in which the object exists and the detected object distance information to the object Scanning measurement means for obtaining
An object movement distance recognition means for obtaining a unit time movement distance of the object based on a temporal change in the detected object distance information;
A detection target object presence determination unit that determines that a detection target object is present in the detection area if the unit time movement distance obtained by the object movement distance recognition unit is equal to or greater than a predetermined threshold;
Position input means for inputting, as detection exclusion position information, a two-dimensional position excluded from the detection area;
In the case where the detection target object is determined to be present by the detection target object presence determination unit, the direction in which the object exists and the distance to the object obtained by the scanning measurement unit are determined by the position input unit. A security sensor, comprising: warning signal output control means for controlling to output a warning signal when none of the inputted detection exclusion position information is supported. The security sensor according to claim 11,
Furthermore, the apparatus includes a passive infrared sensor that receives infrared rays from the detection area and outputs an infrared detection signal indicating the presence of a detection target object in the detection area based on a temperature difference with the surroundings.
The security sensor, wherein the warning signal output control means does not output the warning signal when the infrared detection signal is not output from the passive infrared sensor. The security sensor according to claim 11 or 12,
The security sensor, wherein the two-dimensional position is a polar coordinate system defined by a direction and a distance. The security sensor according to claim 11 or 12,
The security sensor, wherein the two-dimensional position is an orthogonal coordinate system. The security sensor according to any one of claims 11 to 14,
The security sensor, wherein the position input means is a dip switch. The security sensor according to any one of claims 11 to 15,
A security sensor, wherein the direction variable antenna device is a phased array antenna. Transmits multiple microwaves with different frequencies to the detection area, receives the reflected waves from the objects in the detection area, and outputs distance information corresponding to the distance to the object A microwave sensor,
A direction variable antenna device capable of changing the transmission and reception directions of the plurality of microwaves by the microwave sensor within a predetermined angle range;
By instructing the variable direction antenna device to scan within the predetermined angle range in the transmission / reception direction and monitoring the distance information during the scanning, the direction in which the object exists and the detected object distance information to the object Scanning measurement means for obtaining
An object movement distance recognition means for obtaining a unit time movement distance of the object based on a temporal change in the detected object distance information;
A detection target object presence determination unit that determines that a detection target object is present in the detection area if the unit time movement distance obtained by the object movement distance recognition unit is equal to or greater than a predetermined threshold;
A passive infrared sensor that receives infrared rays from the detection area and outputs an infrared detection signal indicating the presence of a detection target object in the detection area based on a temperature difference with the surroundings;
When the detection target object is determined to be present by the detection target object presence determination unit and the infrared detection signal is not output from the passive infrared sensor, the scanning measurement unit obtains the detection target object. Position storage means for storing the direction in which the object exists and the distance to the object as two-dimensional detection limited position information;
Control is performed to output a warning signal when the detection target object is determined by the detection target object presence determination means and the infrared detection signal is output from the passive infrared sensor. Warning signal output control means for
If the direction in which the object exists obtained by the scanning measurement unit and the distance to the object correspond to any of the detection limit position information stored in the position storage unit, the detection target object existence determination The security sensor, wherein the predetermined threshold value used for determining whether or not a detection target object is present in the means is changed to a larger value. Transmits multiple microwaves with different frequencies to the detection area, receives the reflected waves from the objects in the detection area, and outputs distance information corresponding to the distance to the object A microwave sensor,
A direction variable antenna device capable of changing the transmission and reception directions of the plurality of microwaves by the microwave sensor within a predetermined angle range;
By instructing the variable direction antenna device to scan within the predetermined angle range in the transmission / reception direction and monitoring the distance information during the scanning, the direction in which the object exists and the detected object distance information to the object Scanning measurement means for obtaining
An object movement distance recognition means for obtaining a unit time movement distance of the object based on a temporal change in the detected object distance information;
A detection target object presence determination unit that determines that a detection target object is present in the detection area if the unit time movement distance obtained by the object movement distance recognition unit is equal to or greater than a predetermined threshold;
Distance input means for inputting a distance range excluded from the detection area as detection exclusion distance information;
The detection exclusion in which it is determined that the detection target object exists by the detection target object presence determination unit, and the distance to the object obtained by the scanning measurement unit is input by the distance input unit A security sensor characterized by comprising a warning signal output control means for controlling to output a warning signal when it does not correspond to any of the distance information. The security sensor according to claim 18,
Furthermore, the apparatus includes a passive infrared sensor that receives infrared rays from the detection area and outputs an infrared detection signal indicating the presence of a detection target object in the detection area based on a temperature difference with the surroundings.
The security sensor, wherein the warning signal output control means does not output the warning signal when the infrared detection signal is not output from the passive infrared sensor. Transmits multiple microwaves with different frequencies to the detection area, receives the reflected waves from the objects in the detection area, and outputs distance information corresponding to the distance to the object A microwave sensor,
An object movement distance recognizing means for obtaining a unit time movement distance of the object based on a temporal change of the distance information;
A detection target object presence determination unit that determines that a detection target object is present in the detection area if the unit time movement distance obtained by the object movement distance recognition unit is equal to or greater than a predetermined threshold;
Distance input means for inputting a distance range excluded from the detection area as detection exclusion distance information;
When the detection target object is determined to be present by the detection target object presence determination unit, any of the detection exclusion distance information in which the distance to the detection target object is input by the distance input unit And a warning signal output control means for controlling so as to output a warning signal when not responding. The security sensor according to claim 20,
Furthermore, the apparatus includes a passive infrared sensor that receives infrared rays from the detection area and outputs an infrared detection signal indicating the presence of a detection target object in the detection area based on a temperature difference with the surroundings.
The security sensor, wherein the warning signal output control means does not output the warning signal when the infrared detection signal is not output from the passive infrared sensor.

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