JPH08101999A - Mobile object detector - Google Patents

Abstract

PURPOSE: To reduce processing loads on a host side and to reduce overlapping monitoring for the same monitoring object by handling identification information as one no matter how many times the same identification information is received within passing required time and transmitting the identification information only once to the host side. CONSTITUTION: An MPU 12 refers to the column of the passing required time and a reception time column in a transmission management table 136 and obtains the passing required time and the time information of the time when detection is performed for a first time. Then, based on the time when the identification information of movable objects 40 and 50 is received for the first time, by comparing a difference with the time when the identification information is received next with the passing required time, the identification information is handled as one no matter how many times the same identification information is received within the passing required time and the transmission of the identification information for only once and the transfer of the information of the date and time when the detection is performed for the first time, for instance, are performed to the side of a host 3. Thus, the same information is prevented from being transferred for many times during the prescribed time to the side of the host 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving body detecting device, and more particularly, to a monitoring system for monitoring an article moving with a person by a person or the like by a transponder method using radio in a predetermined area. In the above, the present invention relates to a mobile body monitoring system capable of reducing the processing load of the host data processing device receiving the detection result from the monitoring sensor side and reducing the duplicate monitoring for the same monitoring target.

[0002]

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

The reader 2 is a monitoring sensor for transmitting and receiving to and from so-called transponders using radio waves to detect transponders, and sends radio frequency radio waves from the antenna 21 to the transponder 4 or the transponder 5. Radio waves sent back from the transponder side are received by the antenna, the identification code thereof is detected, and parallel / serial conversion is internally performed and sent to the RS-232C line. The reader 2 is composed of, for example, a reception circuit 22, a demodulation circuit 23, a controller 24, a communication circuit 25, etc., and sets the first 50 msec as a transmission period to the transponders 4, 5 via the transmission / reception antenna 21. , The next 50 msec as the reception period, 100 msec
Send and receive at the cycle of The transmitting / receiving antenna 21 is provided in the rod-shaped transponder 4 or the card-type or tag-type transponder 5 at a predetermined cycle, for example, in the FM.
The wave is transmitted, and the FM signal modulated by the identification code, which is transmitted from the transponder side receiving the wave, is received. The reception signal is amplified by the reception circuit 22, the identification code portion is converted into a serial digital value by the demodulation circuit 23, and is extracted. When the identification code is detected, the controller 24 receives it, detects it, sets it in an internal register, serially sends this identification code to the communication circuit 25, and sends it to the line 6 to the host 3 side. Send. The controller 24 temporarily stores the identification code in the internal register, and does not send the stored identification code to the host side even if the same identification code is detected next time. However, in a normal monitoring system, in order to ensure safety, such an internal register of the reader 2 is reset each time an identification code is received so that the reader 2 can be constantly monitored.

The host 3 first manages the date and time for the received identification code. Then, normally, a signal for resetting the register is sent to cause the reader to perform re-detection. As a result, the same identification code is repeatedly sent from the reader 2. The host 3 also receives the identification code from a similar reader placed in another place, and a specific article is sent from the surveillance area to the outside based on the identification codes from some readers and the information such as the placement location and date and time. And a determination process as to whether or not it is brought out. In order to prevent important information from leaking to the outside, lock the door that leads to the outside as necessary and manage it so that it cannot be taken outside. The rod-shaped transponder 4 or the card-type or tag-type transponder 5 is
It can be attached to or embedded in the individual to be monitored. Of course, when the person itself is to be monitored, the person wears it.

This type of transponder has a problem that its consumption becomes a problem when it is driven by a battery. Therefore, a radio wave transmitted from the reader 2 side to the transponders 4, 5 via the transmission / reception antenna 21 or another transmission antenna. 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 an identification code peculiar to the held individual by radio waves. The transmission circuit is not shown in the figure.

[0006]

In this type of monitoring system, when a moving body (monitoring individual) passes through a coverage area (area) in which a receiving antenna can receive, the individual uses radio waves transmitted from the moving body. Since we have obtained the identification information of
The identification information of the same individual is repeatedly received from the same receiving antenna. If the number of receiving antennas is large, the number of times the same identification information is received increases, and since each reader sends it to the host as it is, the host side repeatedly receives the same identification information. . On the host side, processing such as whether or not the transmitted identification information has already been stored is carried out each time it is received, so the processing load on the host side increases and this leads to a drop in processing. As a result, it is difficult to increase the number of readers that can be managed at the same time, and the size of the system is limited. Moreover, on the host side, what
It becomes difficult to understand which surveillance area (a certain point) has been passed. To avoid this,
If the number of resets to the reader is reduced, oversight may occur, resulting in a lack of safety. There is a high risk of not being able to manage the number of times the same detection target is passed. The present invention solves the above-mentioned problems of the prior art, and provides a moving object detection apparatus capable of reducing the processing load on the host side and reducing duplicate monitoring of the same monitoring target. To aim.

[0007]

A feature of the moving body detecting apparatus of the present invention for achieving such an object is that a moving body moving time estimated to pass through a predetermined area or a required time longer than that is required. A memory that stores corresponding to the identification information of each of the plurality of moving bodies, and when any of the plurality of moving bodies is first detected, the identification information of the detected moving body and the time thereof. And a recording means for recording the same in a memory or other memory, and the time difference between the time when the same moving object is detected subsequently by referring to the recorded identification information and the time currently detected. And a memory for the same moving body detected thereafter with reference to the recorded identification information to obtain a required time corresponding to the identification information of this moving body, and obtain the required time. But Determination means for determining whether or not the difference is larger than the time, and identification information of the mobile body when any of the plurality of mobile bodies is first detected and when the determination result of the determination means is large. Is transmitted to the host.

[0008]

For example, first, the normal moving speed of the moving body (individual) is measured manually or automatically, and it is detected from the time first detected through a certain receiving antenna used in the monitoring system to the time last detected. The time required for the moving body to pass (standard passing required time) is calculated, 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 mobile unit is first received via the receiving antenna having a reception area that is substantially similar to the stored required transit time, By comparing with the passage required time of, within the above passage required time, no matter how many times the same identification information is received, it is treated as one,
The identification information is transmitted only once to the host side, and information such as the date and time of the first detection is transferred.
By doing so, the same identification information is not transferred many times on the host side during the above-mentioned predetermined time. Moreover, since the data that is not monitored is also transmitted, the number of movements of the mobile unit can be managed, and the number of receptions on the host side is reduced, which eliminates the need for data processing. The load is reduced.

[0009]

1 is a block diagram of a mobile body monitoring system showing an embodiment of the present invention. In FIG. 1, two readers 2a and 2b are provided in place of the reader 2 of FIG.
The structure of each reader 2a, 2b is the same as that of the reader 2. Reference numeral 10 is a monitoring terminal that receives the identification codes sent from the readers 2a and 2b. Leader 2
a and 2b transmit a transmission wave to the mobile bodies 40 and 50 to which the transponders 4 and 5 are added via the transmission / reception antennas 21a and 21b, respectively. The transmission frequency is 130k
It is an FM wave around Hz and its output is about several tens mW. As a result, the range in which the mobile units 40 and 50 (the transponders 4 and 5 thereof) can receive and transmit is a region having a radius of about 3 m to 5 m. Here, in order to reliably monitor the target, the two transmitting / receiving antennas 21a and 21b receive the same target. Moreover, as will be described later, if it is received by any of the antennas even once, it means that the target (moving body) is 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.

Mobile units 40, 50 (transponder 4,
In 5), when the FM wave is received, it is sent to RO
Modulation circuits 40a and 50a composed of mixers and the like for modulating the identification codes stored in M and the like, identification code storage ROMs 40b and 50b, and power supply circuits 40c and 50.
c and. The power supply circuits 40c and 50c are circuits that rectify the burst signal transmitted from the monitoring terminal 10 and charge the capacitors to supply the power from the capacitors to the above circuits. Since the readers 2a and 2b have two systems, the monitoring terminal 10 has the RS232C reception interface (reception IF) 11 connected to the bus 16.
a and 11b. Further, the monitoring terminal 10 is
A PU (microprocessor) 12, a memory 13, a timer 14, and a communication interface 15 are connected to each other via a bus 16.

The reception interfaces 11a and 11b convert the identification code sent from the readers 2a and 2b through the RS-232C line into serial / parallel signals and receive them to generate an interrupt signal to notify the MPU 12 of the incoming call. MP
The U12 reads the data of the reception interfaces 11a and 11b by this reception interrupt processing, etc., obtains the date and time at that time by referring to the timer 14, and generates electronic message information in which the date and time is 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, the processing of not transmitting the identification code is performed. For such processing, in the memory 13, the identification code reception program 130, the detection time acquisition program 131, the required time transfer program 132, the required time determination program 133, the identification code transmission program 134, the required passage time table 135, And a transmission management table 136 is provided. In addition, each of the above programs is modularized,
Called and executed by the main program. In addition,
The transit required time table 135 is a table formed in a so-called memory backed up by a power source or a non-volatile memory that retains stored contents after power is set until it is set once, and thus is set in a separate frame. Shows.

The identification code receiving program 130 receives the data of the identification code after parallel conversion byte by byte and stores it in a predetermined area of the memory 13. Then, the reset signal is sent to the reader 2a or the reader 2b which has received the identification code. Identification code receiving program 130
When the reader 2a transmits the identification code of the mobile unit,
Alternatively, when the reader 2b transmits the identification code of the moving body, each identification code is sequentially temporarily stored in a predetermined buffer area of the memory 13. When a reception interrupt occurs during the processing of this program and during the processing of another program, this program receives the interrupt processing, stores the received identification code in the buffer area, and then 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 this buffer area, the identification code of the moving body is stored in the buffer area. In the above case, the detection may be performed once when the same moving body is detected by 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 with reference to each other, one moving object is detected by the logical product of the detections. This is for surely detecting that the moving body has entered the surveillance area, thereby eliminating erroneous detection due to noise or the like. In this case, the monitoring area is not a range in which the transmission / reception antennas 21a and 21b are received by either of them, but a range in which these are overlappingly received.
When the identification code is stored in the buffer area in this way, the detection time acquisition program 131 is then called to acquire information on the current date and time, and the transmission management table 13 is acquired.
It is determined whether or not there is a received identification code in the identification code column 136a (see FIG. 3 (b)) of No. 6, and if the same identification code does not exist, the identification code is stored as the first detection. The detected identification code is additionally stored in the column 136a in the line next to the last line, and the obtained current time is stored in the reception time column 136c (see FIG. 3 (b)) of the transmission management table 136 at that position. Remember. On the other hand, when the same identification code is present, the required time determination program 133 is activated.

The detection time acquisition program 131 refers to the timer 14 to obtain the date and time at that time, 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 transit time table 135 shown in FIG. 3 (a), the same code as the detected identification code is searched, and the required transit time corresponding to this is searched for at the position of the same identification code in the transmission management table 136 (usually , The position of the last line in which the identification code is stored) is written in the required passage 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 "XXXXXXX" shown in FIG. 3 (b) is written in the required time column at the same identification code position. Identification code transmission program 13
Reference numeral 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 telegram, and RS-23 via the communication interface 15.
The process of transmitting to the host 3 is performed according to 2C.

The required transit time table 135 is shown in FIG.
As shown in, there is an identification code field 135a at the beginning,
Corresponding to this, there is a required time column 135b. Column 135
The required time stored in b is a record of the required time for the mobile object to pass through the antenna monitoring area corresponding to the identification code of each mobile object.
21b, or an antenna equivalent to the monitoring area, which is almost the same, as a result of manual or automatic measurement of the normal moving speed of the moving bodies 40, 50 to which the transponders 4, 5 and the like are added. In the case of automatic measurement, the receiving antenna 21a or 2 used in the monitoring system
1b or the time required for the moving bodies of the moving bodies 40 and 50 to pass from the time when they are first detected to the time when they are finally detected (standard passing time), and this is measured multiple times Then, the maximum value is obtained. If the cycle to transmit to the transponder is short and this cycle hardly affects the measurement of the required time, it is possible to manually measure the transit time when the moving bodies 40 and 50 pass through the monitoring area. Can be measured.

As a result of these, in the required transit time table 135, the identification code "XX0" of the moving body 40 is obtained.
The required transit time of 3 seconds is stored in correspondence with 010 ", the required transit time of 5 seconds is stored in correspondence with the identification code" XX0011 ", and the identification code which is not registered as other is To "XXXX
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 body is first detected. First, there is an identification code column 136a, and correspondingly, there is a passage required time column 136b, and its reception time column 136c.

The operation will be described in accordance with the processing flow shown in FIG. 2. First, it is assumed that a certain moving body 40, 50 having a transponder has entered a monitoring area where both the transmitting and receiving antennas 21a, 21b receive. The respective readers 2a and 2b emit radio waves to the mobile bodies 40 and 50, and the radio waves emitted from the mobile bodies 40 and 50 having different frequencies are detected by the respective readers 2a and 2b and the identification codes are sent to the monitoring terminal 10. Will be sent out respectively. Here, as described above, the identification codes of the mobile units 40 and 50 are set to "X."
2, each time these identification codes are transmitted, the MPU 12 executes the identification code receiving program 130 to start the identification code receiving program 130 to capture and identify the received identification code. Store the code in the buffer area temporarily,
Thereby, the moving body detection process 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 detecting process, the detection time acquisition program 131 is called and executed next, 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 there is a received identification code in 6a (step 103), and when the identification code is not registered (N
(When it is O), this identification code is detected as the first identification code in the field 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 field 136c (step 104). Next, the required time transfer program 132 is executed, and the required transit time corresponding to the identification code detected by referring to the required transit time table 135 is transferred to the required transit time recording field 136b of the final registration line of the transmission management table 136. And recorded (step 105). Then, the identification code transmission program 134 is executed, the identification code and the date and time information are formed as a telegram, and are transmitted to the host 3 according to RS-232C via the communication interface 15 (step 106). Here, this process is terminated and the process returns to the main program. In the main program, the identification code for which processing has been completed is erased from the buffer area, and if there is an identification code stored in the buffer area during the above processing, the same interrupt processing as described above is performed for this.

Further, the MPU 12 executes the identification code receiving program 130 (step 101) and makes the determination at step 102. 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 passage required time column 136b and the reception time column 136c in the transmission management table 136 to acquire the passage required time and the time information at the time of the first detection (step 107). Next, in step 102, the information on the current date and time acquired by the detection time acquisition program 131 is referred to, and the difference between the information on the current date and time and the first detected date and time previously acquired is calculated (step 108). Then, it is determined whether or not this difference is larger than the required transit time acquired from the transmission management table 136 (step 109). When it is determined that it is not larger, the detected identification code is discarded, the process is terminated, and the process returns to the main program. Then, in the same manner as above, in the main program, the identification code for which processing has been completed is erased from the buffer area, and if there is an identification code stored in the buffer area during the above processing, the same interrupt processing as above is performed for this. .

If it is determined to be larger, the new current date and time is stored in the acceptance time column 136c of the transmission management table 136 and the date and time (time) is updated (step 11).
0). Then, the process proceeds to step 106, 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 mobile unit.
In this case, the number of times is the required time determination program 13 described above.
Since it is determined to be large in step 109 by step 3, this corresponds to a state in which the moving body that once exited from the predetermined monitoring area is reentered. So 2 of the same moving body
It can be judged as the second move. Moreover, since the number of times the identification code is transferred is reduced by such processing,
A large number of readers can be managed and processing efficiency is improved.

As described above, in the embodiment, the moving body added to a person or an article to move is taken as an example, but the moving body may be a moving object such as a vehicle such as an automobile. In short, in a system that receives identification information sent from a moving body to a moving body within a predetermined area, detects the moving body, and transfers the identification information of the moving body to a host data processing device. From the viewpoint of safety and reliability, any device may be used as long as it can detect the same moving object many times in a short time.

[0021]

According to the present invention, by comparing the difference between the time when the identification information of the mobile unit is first received and the time when the identification information of the mobile unit is received next with the passage time, Within the required transit time, the same identification information will be treated as one regardless of how many times it is received, and the identification information will be sent only once to the host side and the information such as the date and time of the first detection will be transferred. Therefore, the host does not transfer the same identification information many times during the above-mentioned predetermined time. Moreover, since the data that is not monitored is also transmitted, the number of movements of the mobile unit can be managed, and the number of receptions on the host side is reduced, which eliminates the need for data processing. The load is reduced.
As a result, in the host, for example, when the mobile body passes through the reception antenna, it becomes possible to manage the individual identification information, the date and time of passage, the number of passages, etc. at a higher speed, and at the same time, the number of manageable readers also increases. It is possible to build a larger monitoring system.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a moving body monitoring system to which a moving body detection device of the present invention is applied.

FIG. 2 is a flowchart of the processing.

3A and 3B are explanatory diagrams of a table stored in a memory in FIG. 1, in which FIG. 3A is a required transit time table thereof, and FIG. 3B is a transmission management table thereof.

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

[Explanation 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, 21
1a, 21b ... Transmitting / receiving antenna, 22 ... Receiving circuit, 23
... demodulation circuit, 24 ... controller, 25 ... communication circuit, 4
0, 50 ... Mobile object, 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 ... Passage time table, 136 ... Transmission management table.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location G06F 17/60 G07C 9/00 Z H04B 7/26 H04B 7/26 E (72) Inventor Toshihisa Ishii Horiyamashita 1 Horiyamashi, Hadano, Kanagawa Pref., Inside Hitsuyama Computer Electronics Co., Ltd. (72) Inventor, Kazuhiko Ando, 1st Horiyamashita, Hadano, Hadano, Kanagawa Pref.

Claims (2)

[Claims] 1. A host which receives the identification information sent from the moving body a plurality of times for the moving body within a predetermined area, detects the moving body a plurality of times, and stores the identification information of the moving body. In the moving body detection device for transferring to the data processing device, the required time of the moving body predicted to pass through the predetermined area or a required time longer than that is corresponded to the identification information according to each of the plurality of moving bodies. And a memory for storing the identification information of the detected moving body and its time in the memory or another memory when any one of the plurality of moving bodies is first detected, Time calculating means for referring to the recorded identification information and calculating a time difference between the time and the currently detected time when the same moving body is detected thereafter, By referring to the recorded identification information, the memory for the same moving body detected thereafter is referred to to obtain the required time corresponding to the identification information of this moving body, and the required time is Determination means for determining whether or not the time is longer than the time, and when any one of the plurality of moving bodies is first detected and when the result of the determination by the determining means is large, the identification information of this moving body is used as the host data. A moving object detection apparatus comprising: a transmission unit that sends the processing object to the processing apparatus. 2. The mobile body comprises a transponder, and further, a reader that transmits and receives radio waves to and from the transponder via an antenna at a predetermined cycle to generate identification information of the transponder, and a date. And a timer for indicating the time, and the predetermined range is set by the reception range of the antenna and obtains the identification information of the same mobile object from the reader a number of times. 2. The moving body detection device according to claim 1, wherein the identification information detected at this time and the detected date and time are transmitted to the host data processing device.