JP3243773B2 - Moving object detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving object detecting apparatus, and more particularly, to a monitoring system for monitoring an article that moves with a person by being carried or carried by a person or the like in a predetermined area by using a transponder system using radio. The present invention relates to a moving object monitoring system that can reduce the processing load of a host data processing device that receives a detection result from a monitoring sensor side and can reduce duplication monitoring for the same monitoring target.

[0002]

2. Description of the Related Art As a monitoring system for monitoring the movement and taking out of articles by a transponder method using radio,
There is a storage medium of a computer system such as a magnetic tape or a magnetic cassette tape on which important information is recorded, or a confidential document in which important information is recorded on paper. FIG. 4 shows a basic configuration of this type of monitoring system. Monitoring system 1
Is provided with a reader 2 and a host computer (hereinafter referred to as a host) 3, which are usually connected via a modem via a dedicated line or a public line. This connection is generally via line 6 of the RS-232C interface.

The reader 2 is a monitoring sensor for detecting a transponder by transmitting / receiving to / from a so-called transponder using radio waves, and transmits a radio frequency radio wave from the antenna 21 to the transponder 4 or the transponder 5. The radio wave returned from the transponder side is received by the antenna, its identification code is detected, and the parallel / serial conversion is performed internally and transmitted to the RS-232C line. The reader 2 is composed of, for example, a receiving circuit 22, a demodulating circuit 23, a controller 24, a communication circuit 25, and the like, and transmits the first 50 msec to the transponders 4 and 5 via the transmitting / receiving antenna 21, for example. , The next 50 msec as a reception period, 100 msec
Is transmitted and received in the cycle The transmission / reception antenna 21 is provided with a rod-shaped transponder 4 or a card-type or tag-type transponder 5 at a predetermined period, for example, FM.
A wave is transmitted, and the FM signal modulated with the identification code transmitted from the transponder side receiving the wave is received. The reception signal is amplified by the reception circuit 22, and the identification code portion is converted into a serial digital value by the demodulation circuit 23 and extracted. Upon detection of the identification code, the controller 24 detects the identification code, detects the identification code, sets the detection result in an internal register, serially transmits the identification code to the communication circuit 25, transmits the identification code to the line 6, and transmits the identification code to the host 3. Send. Note that the controller 24 temporarily stores the identification code in the internal register, and does not transmit the stored identification code to the host even if the same identification code is detected next time. However, in a normal monitoring system, in order to ensure safety, the internal register of such a reader 2 is reset each time an identification code is received, so that the reader 2 can always be monitored.

The host 3 first performs date and time management on the received identification code. Then, normally, a signal for resetting the register is transmitted to cause the reader to execute re-detection. As a result, the same identification code is transmitted from the reader 2 many times. The host 3 also receives an identification code from a similar reader placed at another location, and a specific article is sent from the monitoring area to the outside based on the identification codes from some readers and information such as its location, date and time. It is determined whether or not it is in a state of being taken out. In order to prevent important information from leaking to the outside, lock doors that lead to the outside as necessary, and manage so that they are not taken out. The rod-shaped transponder 4 or the card-type or tag-type transponder 5
It can be attached to or embedded in an individual to be monitored. Of course, if the person itself is to be monitored, it will be worn by the person.

This type of transponder is problematic in that it consumes power when driven by a battery. Therefore, radio waves transmitted from the reader 2 to the transponders 4 and 5 via the transmitting / receiving antenna 21 or other transmitting antennas. Upon receiving the (burst signal), the capacitor is charged using the energy of this radio wave. Then, using this capacitor as a battery, the transponder uses the stored energy as a power source and sends back the identification code unique to the individual held by radio waves. Note that the transmission circuit is not shown in the figure.

[0006]

In this type of monitoring system, when a mobile object (monitored individual) passes through a coverage area (area) that can be received by a receiving antenna, the individual object is transmitted by radio waves transmitted from the mobile object. Because we have obtained the identification information of
The identification information of the same individual is received many times from the same receiving antenna. When the number of receiving antennas is large, the number of times of receiving the same identification information also increases, and each reader sends it to the host as it is, so that the host performs processing of receiving the same identification information many times. . On the host side, processing such as whether or not the transmitted identification information has already been stored is performed each time reception is performed, so that the processing load on the host side increases, leading to a reduction in processing. As a result, the number of readers that can be managed at the same time is unlikely to increase, and the size of the system is limited. Moreover, the host decides what, when, how many times,
It becomes difficult to grasp which monitoring area (a certain point) has passed. To avoid this,
If the number of resets for the reader is reduced, there is a problem in that monitoring is missed and security is lacking. There is a high risk that the number of times of passing through the same detection target cannot be managed. The present invention is to solve such a problem of the related art, and it is an object of the present invention to provide a moving object detection device capable of reducing a processing load on a host side and reducing duplication monitoring for the same monitoring target. Aim.

[0007]

SUMMARY OF THE INVENTION A feature of a moving object detecting apparatus according to the present invention for achieving the above object is that the time required for a moving object predicted to pass through a predetermined area or a longer time is required. A memory that stores the identification information corresponding to each of the plurality of moving objects, and, when any of the plurality of moving objects is first detected, the identification information of the detected moving object and its time. Recording means for recording the data in a memory or another memory;
Time for calculating the difference between the time and the currently detected time when the same moving object detected thereafter is referred to by referring to the identification information of the detected moving object recorded in the memory. Calculation means and the memory or other memory
For the same mobile object detected on it after with reference to the identification information of the detected moving object is recorded in the memory, identification
Obtaining a required time corresponding to the identification information of the moving body obtained by referring to a memory storing the required time corresponding to the information, and determining whether the required time is greater than the time of the difference Determining means, and transmitting means for transmitting identification information of the moving body to the host when any of the plurality of moving bodies is first detected and when the result of the determination by the determining means is large. is there.

[0008]

For example, first, the normal moving speed of the moving object (individual) is measured manually or automatically, and the normal moving speed is detected from the first detected time through a certain receiving antenna used in the monitoring system. The time required for the moving body to pass (the standard required time) up to the time is obtained, and required time data corresponding to the identification information of each moving body is created and stored in the memory. Then, for example, based on the time at which the identification information of the moving object is first received through a receiving antenna having a reception area that is substantially similar to the stored required transit time, the difference between the next reception time and the time By comparing the time required for passing, the same identification information is treated as one regardless of the number of times the same identification information is received within the time required for passing.
The host transmits the identification information only once, and transfers, for example, information such as the date and time detected first.
By doing so, the host will not transfer the same identification information many times during the predetermined time. In addition, since data that is not monitored is also transmitted, the number of movements of the moving object can be managed, and the number of receptions on the host side is reduced, eliminating the need for data processing for those. Load is reduced.

[0009]

FIG. 1 is a block diagram of a mobile monitoring system according to an embodiment of the present invention. In FIG. 1, two systems of readers 2a and 2b are provided in place of the reader 2 of FIG.
The configuration of each of the readers 2a and 2b is the same as that of the reader 2. A monitoring terminal 10 receives the identification codes sent from the readers 2a and 2b. Reader 2
a and 2b transmit transmission waves to the moving bodies 40 and 50 to which the transponders 4 and 5 are added, respectively, via the transmitting and receiving antennas 21a and 21b. The transmission frequency is 130k
It is an FM wave of about Hz, and the output is about several tens mW. As a result, the range in which the mobile units 40 and 50 (the transponders 4 and 5) can receive and transmit the data is an area having a radius of about 3 m to 5 m. Here, in order to surely monitor the target, the two transmitting and receiving antennas 21a and 21b receive the same target. Moreover, if the signal is received even once by any of the antennas as described later, it means that the target (moving object) has been detected. That is, the monitoring area here is a range in which the transmitting and receiving antennas 21a and 21b are received by either of them.

The moving bodies 40 and 50 (transponders 4 and 50)
5), when the FM wave is received, the
Modulating circuits 40a and 50a comprising mixers and the like for modulating according to the identification code stored in M and the like, identification code storage ROMs 40b and 50b, and power supply circuits 40c and 50
c. The power supply circuits 40c and 50c are circuits that rectify a burst signal transmitted from the monitoring terminal 10, charge a capacitor, and supply power from the capacitor to each of the circuits. Since the readers 2a and 2b are of two systems, the monitoring terminal 10 receives the RS232C reception interface (reception IF) 11 connected to the bus 16.
a and 11b. In addition, the monitoring terminal 10
A PU (microprocessor) 12, a memory 13, a timer 14, and a communication interface 15 are mutually connected via a bus 16.

The receiving interfaces 11a and 11b receive the identification codes sent from the readers 2a and 2b via the RS-232C line by serial-to-parallel conversion, and generate an interrupt signal to notify the MPU 12 of the arrival. MP
U12 reads the data of the reception interfaces 11a and 11b by the reception interrupt processing and the like, obtains the date and time at that time by referring to the timer 14, generates message information in which the date and time are added to the received identification code, This is sent to the host 3 via the line 6 via the communication interface 15. Further, the required time is monitored for the received identification code, and if it is within the required time, processing for not transmitting the identification code is performed. For such processing, the memory 13 stores an identification code reception program 130, a detection time acquisition program 131, a required time transfer program 132, a required time determination program 133, an identification code transmission program 134, a required required passage time table 135, A transmission management table 136 is provided. Each of the above programs is modularized,
Called and executed from the main program. In addition,
Once set, the required passage time table 135 is a table formed in a memory backed up by a power supply or a non-volatile memory that retains the stored contents even after the power is turned off until it is set next time. Is shown.

The identification code receiving program 130 receives the identification code data after the parallel conversion one byte at a time and stores it in a predetermined area of the memory 13. Then, a reset signal is sent to the reader 2a or the reader 2b that has received the identification code. Identification code receiving program 130
When the reader 2a transmits the identification code of the moving object,
Alternatively, when the reader 2b transmits the identification code of the moving object, the identification code is sequentially and temporarily stored in a predetermined buffer area of the memory 13. When a reception interrupt occurs during the processing of this program and the processing of another program, the program accepts the interrupt processing, stores the received identification code in the buffer area, and returns to the original processing. Therefore, when the identification code is detected once by either the reader 2a or the reader 2b with reference to the buffer area, the identification code of the moving object is stored in the buffer area. In the above case, the detection may be performed once when the same moving body is detected in the reader 2a and the reader 2b. In this case, each receiving buffer area is divided, and when the same identification code is stored in both buffers by referring to each other, one moving body is detected by a logical product of the detections. This is to surely detect that the moving object has entered the monitoring area, thereby eliminating erroneous detection due to noise or the like. In this case, the monitoring area is not a range where the transmitting and receiving antennas 21a and 21b are received by either of them, but a range where these are received in duplicate.
When the identification code is stored in the buffer area as described above, the detection time acquisition program 131 is called to acquire the information of the current date and time.
It is determined whether or not the received identification code is present in the identification code column 136a of FIG. 6 (see FIG. 3 (b)). If the same identification code is not present, it is regarded as the first detection and the identification code is stored. The detected identification code is additionally stored in the column 136a of the line next to the last line thus obtained, and the obtained current time is stored in the reception time column 136c (see FIG. 3B) of the transmission management table 136 at that position. Remember. On the other hand, if the same identification code exists, the required time determination program 133 is started.

The detection time acquisition program 131 obtains the date and time at that time by referring to the timer 14 and temporarily stores it as a current date and time in a predetermined area (for example, a time variable) of the memory 13. The required time transfer program 132
Referring to the required passage time table 135 shown in FIG. 3A, the same code as the detected identification code is searched, and the corresponding required passage time is set to the position of the same identification code in the transmission management table 136 (normally, , The position of the last line where the identification code is stored) in the required transit time column 136b. When the identification code is not found in the above search,
The data of the required transit time in the column of the other identification code "XXXXXX" shown in FIG. 3B is written in the required time column of the position of the same identification code. Identification code transmission program 13
4 forms the detected identification code and the information of the current date and time acquired by the detection time acquisition program 131 as a message, and sends the message to the RS-23 via the communication interface 15.
Processing for transmitting to the host 3 is performed according to 2C.

The required passage time table 135 is shown in FIG.
As shown in the figure, first, there is an identification code column 135a,
Corresponding to this, there is a required time column 135b. Column 135
The required time stored in “b” is a record of the time required for the moving object to pass through the monitoring area of the antenna corresponding to the identification code of each moving object.
This is the time as a result of manually or automatically measuring the normal moving speed of the moving bodies 40 and 50 to which the transponders 4 and 5 and the like are added, using the antenna 21b or an antenna having a monitoring area substantially equivalent thereto. In the case of automatic measurement, the receiving antenna 21a or 2
The time required for the moving bodies 40 and 50 to pass from the first detection time to the last detection time with the antenna 1b or equivalent (standard passing time), and this is measured a plurality of times. By determining the maximum value. In the case where the period of transmission to the transponder is short and this period hardly affects the measurement of the required time, it is also possible to manually measure the transit time when the moving bodies 40 and 50 actually pass through the monitoring area. Can be measured.

As a result, the identification code “XX0” of the moving body 40
010 ”is stored for the required transit time of 3 seconds, and the identification code“ XX0011 ”is stored for the required transit time of 5 seconds. To “XXXXXX
The required transit time of 9 seconds is stored as X ". FIG. 3B shows a specific example of the transmission management table 136.
It is a table registered when a moving object is first detected. First, there is a column 136a for the identification code, and corresponding to this, there is a column 136b for the required transit time and a reception time column 136c.

The operation will be described in accordance with the processing flow shown in FIG. 2. First, it is assumed that certain moving bodies 40 and 50 equipped with transponders have entered a monitoring area where both transmitting and receiving antennas 21a and 21b receive. The readers 2a and 2b transmit radio waves to the mobiles 40 and 50, and the readers 2a and 2b detect radio waves having different frequencies emitted from the mobiles 40 and 50, and send the identification codes to the monitoring terminal 10. Are sent out. Here, as described above, the identification codes of the mobile units 40 and 50 are respectively set to “X”.
In FIG. 2, each time these identification codes are transmitted, the MPU 12 executes the identification code receiving program 130 to start the reception interrupt every time these identification codes are transmitted. Temporarily store the code in the buffer area,
Thereby, the detection processing of the moving body is performed (step 10).
1). When the identification code “XX0010” of the moving body 40 is stored in the buffer area by the moving body detection processing, the detection time acquisition program 131 is called and executed, and the timer 14 is referred to and acquired. The time is stored in the temporary memory as information on the current date and time (step 102).

Then, column 13 of the transmission management table 136
It is determined whether or not the received identification code is present in 6a (step 103). If the identification code is not registered (N
In the case of O), this identification code is detected as the first identification code detection in the column 136 of the transmission management table 136.
The identification code is registered in a, and the temporarily stored time is registered in the reception time column 136c (step 104). Next, the required time transfer program 132 is executed, and the required time of passage corresponding to the detected identification code is referred to the required time of transfer table 135 and transferred to the record field 136b of the required time of transmission of the last registered line of the transmission management table 136. And recorded (step 105). Then, the identification code transmission program 134 is executed, and the identification code and the date and time information are formed as a telegram and transmitted to the host 3 via the communication interface 15 according to RS-232C (step 106). Here, the process is terminated and the process returns to the main program. The main program deletes the processed identification code from the buffer area, and if there is an identification code stored in the buffer area during the processing, performs the same interrupt processing as described above.

Further, the MPU 12 executes the identification code receiving program 130 (step 101) and makes the determination in the above-mentioned step 103. If it is determined that the identification code is registered (YES), Then, the required time determination program 133 is executed and the MPU 12
Refers to the required passage time column 136b and the reception time column 136c in the transmission management table 136, and acquires the required passage time and the time information at the time of first detection (step 107). Next, the information of the current date and time acquired by the detection time acquisition program 131 in step 102 is referred to, and the difference between the information of the current date and time and the previously acquired date and time of the first detection is calculated (step 102). 108). Then, it is determined whether this difference is greater than the required transit time acquired from the transmission management table 136 (step 109). When it is determined that it is not large, the detected identification code is discarded, this processing ends, and the process returns to the main program. Then, in the same manner as described above, the main program deletes the processed identification code from the buffer area, and if there is an identification code stored in the buffer area during the processing, performs the same interrupt processing as described above. .

If it is determined that the time is larger, the new current date and time is stored in the reception time column 136c of the transmission management table 136, and the date and time (time) are updated (step 11).
0). Then, the process proceeds to step 106, where the identification code transmission program 134 is executed, and the identification code and the current date and time are sent to the host 3. As a result, each time the identification code is transferred, the host 3 can count the number of times as individual information for the same moving object.
The number of times in this case is determined by the required time determination program 13 described above.
Since it is determined in Step 109 that the moving object is large in Step 3, this corresponds to a state in which the moving object once exited from the predetermined monitoring area has entered again. So, 2 of the same mobile
It can be determined that this is the second movement. In addition, since such processing reduces the number of times the identification code is transferred,
Many readers can be managed, and processing efficiency is improved.

The above has been described, in the embodiment, has been a moving body that moves by being added to a human or an article as an example, as the moving body may be a moving object of a vehicle such as an automobile. In short, UNA system by transferring receives the identification information sent from the mobile detects the moving body identification information of the mobile host data processing device to the mobile in the range of a predetermined area In the above, any device may be used as long as the device detects the same moving object many times in a short time from the viewpoint of safety and reliability.

[0021]

According to the present invention, the difference between the time when the identification information of the moving object is received first and the time required for passing is compared with the difference between the time when the identification information is received next and the time required for passing. Within the required transit time, the same identification information is treated as one, no matter how many times it is received, and the identification information is transmitted to the host only once and information such as the date and time of the first detection is transferred. Therefore, the host does not transfer the same identification information many times during the predetermined time. In addition, since data that is not monitored is also transmitted, the number of movements of the moving object can be managed, and the number of receptions on the host side is reduced, eliminating the need for data processing for those. Load is reduced.
As a result, for example, when the moving object passes through the receiving antenna, the host can manage the identification information of the individual, the date and time of passage, and the number of times of passage, and the number of readers that can be managed simultaneously increases. And a larger surveillance system can be constructed.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of a moving object monitoring system to which a moving object detecting device of the present invention is applied.

FIG. 2 is a flowchart of the process.

FIG. 3 is an explanatory diagram of a table stored in a memory in FIG. 1; FIG. 3 (a) is a table of required transit time, and FIG. 3 (b) is a transmission management table thereof.

FIG. 4 is a schematic diagram of a conventional mobile monitoring system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Monitoring system, 2, 2a, 2b ... Reader, 3 ... Host computer (host), 4, 5 ... Transponder,
6 RS-232C interface line, 10 monitoring terminal, 11a, 11b receiving interface, 12 MP
U (microprocessor), 13: memory, 14: timer, 15: communication interface, 16: bus, 21, 22
1a, 21b: transmitting / receiving antenna, 22: receiving circuit, 23
... demodulation circuit, 24 ... controller, 25 ... communication circuit, 4
0, 50: moving body, 130: identification code receiving program, 131: detection time acquisition program, 132: required time transfer program, 133: required time determination program,
134: identification code transmission program, 135: transit time table, 136: transmission management table

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiko Ando 1 Horiyamashita, Hadano-shi, Kanagawa Hitachi Computer Electronics Co., Ltd. (56) References JP-A-6-201821 (JP, A) JP-A-4-229729 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G08G 1/01 H04B 7/26

Claims (2)

(57) [Claims] 1. A identification information sent from the mobile to the mobile in the range of a predetermined area receives multiple times the moving body is detected a plurality of times phosphonium the identification information of the mobile In the moving object detection device for transferring to the data processing device, the required time of the moving object predicted to pass through the predetermined area or a required time longer than the time is identified according to each of the plurality of moving objects. A memory for storing information corresponding to the information, and when any one of the plurality of moving objects is first detected, the identification information of the detected moving object and the time thereof are recorded in the memory or another memory. Recording means, and the detection means recorded in the memory or another memory.
And time calculation means for referring to the identification information of the issued mobile calculates the time and time difference between the current detected time when said detected for the detected same mobile thereto after the The check recorded in the memory or other memory
With reference to the issued identification information of the moving object, for the same moving object detected after the above ,
The time required is obtained by referring to the memory in which the time is stored.
That to obtain the required time corresponding to the identification information of the mobile, and the time required determining means for determining whether greater than the time of the difference, one of the plurality of moving body is first detected And a transmitting means for transmitting the identification information of the moving object to the host data processing device when the judgment is made and the result of the judgment by the judging means is large. 2. The mobile device according to claim 1, further comprising a transponder, further comprising: a reader for transmitting and receiving the transponder with the transponder by radio waves at a predetermined cycle via an antenna to generate identification information of the transponder; And a timer that indicates the time, the range of the predetermined area is set by the reception range of the antenna, and obtains the identification information of the same moving object from the reader many times, and refers to the timer. 2. The moving object detection device according to claim 1, wherein the date and time are recorded by using the host data processing device, and the identification information detected at this time and the detected date and time are transmitted to the host data processing device.