JP2006321620A - Environmental information gathering system, and environmental information gathering method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To gather environmental information of a transported article with higher precision using results of sensing by other sensor nodes existing nearby. <P>SOLUTION: Each sensor node 1 comprises a measuring means 11 to measure environmental information of the transported article at the own sensor node, a correcting operation means 12 to transmit measured environmental information to other sensor nodes 1, receive environmental information from other sensor nodes 1, and determine the environmental information of the own sensor node based on the environmental information received from other sensor nodes 1, and a transmitting means 14 to transmit the environmental information of the own sensor node 1 determined by the correcting operation means 12 to a server 3. The server 3 comprises an environmental information storage means 32 to store the environmental information, a receiving means 2 to receive determined environmental information from each sensor node, and a writing means to write the received environmental information to an environmental information storage means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technique for collecting environmental information of a transported product.

  In recent years, there has been a growing interest in safety for products such as food. Therefore, when a product distributed in the market is transported from a production location to a sales location by a truck or the like, it is necessary to appropriately control the temperature of the product being moved or stored so as not to deteriorate the quality of the product. In addition, when products are transferred by various means of transportation, it is necessary to prove that the environment was actually appropriate in each transportation process and to clarify responsibility for the quality of goods during transportation. is there. That is, in order to increase the commercial value, there is a need for a technique for actually recording and managing the temperature change of the commercial product during the distribution process.

For example, Non-Patent Document 1 describes a temperature recording system that senses and stores a temperature change of a product.
“Button cool memory”, [online], [May 10, 2005 search], Internet <URL: http://www.sshouse.jp/goods/button_type.html>

  In the temperature recording system of Non-Patent Document 1, a recorder equipped with a sensor and memory for detecting a temperature change is attached to a transported product such as a commodity. The recorder automatically records the temperature of the transported item in the memory.

  However, this recorder records a temperature different from the actual temperature when the sensor has failed. Further, when the recorder is used for a long period of time, the sensor characteristics change (deteriorate) due to secular change, and therefore, a process for calibrating the temperature sensed by the sensor to a correct value is required. Correcting and calibrating the value sensed by a sensor that has failed in this way, or a sensor whose characteristics have changed due to aging, requires a large workload on the administrator.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to collect environmental information on transported goods with higher accuracy using sensing results of other sensor nodes existing in the vicinity. .

  In order to solve the above-described problems, the present invention provides, for example, an environmental information collection system that collects environmental information of a transported product, and includes a plurality of sensor nodes that measure the environmental information, and a server that manages the environmental information. Have. And each sensor node transmits the measured environmental information to other sensor nodes within a predetermined communication range, and measuring means for measuring the environmental information of the transported goods in which the sensor node is installed at a predetermined timing. Based on the communication means for receiving the environment information measured by the other sensor node from the other sensor node, the environment information of the own sensor node measured by the measurement means, and the environment information received from the other sensor node, Correction calculation means for calculating the environmental information of the own sensor node; and transmission means for transmitting the environmental information of the own sensor node calculated by the correction calculation means to the server. The server includes an environment information storage unit that stores the environment information, a reception unit that receives the calculated environment information from each of the sensor nodes, and the environment information stored in the environment information storage unit. Writing means for storing in the means.

  According to the present invention, it is possible to collect more accurate environmental information on the transported goods using the sensing results of other sensor nodes existing in the vicinity.

  Hereinafter, embodiments of the present invention will be described.

  FIG. 1 is an overall configuration diagram of an environment information collection system to which an embodiment of the present invention is applied.

  The environmental information collection system shown in the figure has a sensor node 1 added (installed) to each package 4, a sensor node transceiver 2, and a server 3.

  The package 4 is packaged (stored) for transporting at least one transported item 41. The package 4 is, for example, a case for storing a bottle (transported product 41) containing drinks, a pallet for mounting the transported product 41, or the like. Each package 4 is stored or stored in, for example, a warehouse at the time of storage, or a truck bed (storage) at the time of transportation. Further, the transported goods 41 stored in the package 4 are luggage such as products (for example, food) distributed in the market.

  The sensor node 1 added to each package 4 is a device that senses (measures, senses) the environmental information (temperature, humidity, impact, etc.) of the package 4 and transmits it to the server 3. As illustrated, the sensor node 1 includes a measurement unit 11, a correction calculation unit 12, a parameter calculation unit 13, a communication unit 14, and a storage unit 15.

  The measurement unit 11 senses at least one environment information using a sensor described later. The environmental information is an index for evaluating the storage environment of the transported goods, and includes, for example, temperature, humidity, vibration and the like. The correction calculation unit 12 corrects the sensing result value of the environmental information sensed by the measurement unit 11 using the sensing result value of another sensor node existing in the vicinity. The parameter calculation unit 13 calculates a calibration parameter for calibrating the sensing result value of the environmental information sensed by the measurement unit 11. The communication unit 14 transmits / receives data to / from the server 3 or other sensor nodes existing in the vicinity via the sensor node transceiver 2. The storage unit 15 stores environment information measured by the measurement unit 11, environment information corrected by the correction calculation unit 12, calibration parameters calculated by the parameter calculation unit 13, and the like as necessary.

  The sensor node transmitter / receiver 2 is connected to the server 3 and transmits / receives data to / from the sensor node 1 wirelessly under the control of the server 3. The sensor node transceiver 2 includes an antenna, a communication module, and a connection interface with the server 3.

  The server 3 collects and manages environmental information measured by the sensor node 1. The server 3 includes a processing unit 31 and a storage unit 32. The processing unit 31 acquires environmental information from each sensor node 1 via the sensor node transmitter / receiver 2 and stores it in the environmental information table 33 of the storage unit 32. The storage unit 32 stores an environment information table 33 in which environment information is stored. The environment information table 33 will be described later.

  Next, the hardware of the sensor node 1 and the server 3 will be described.

  FIG. 2 is a diagram illustrating an example of a hardware configuration of the sensor node 1. The sensor node 1 is driven by a battery and includes a sensor 81, a CPU 82, a memory 83, and a wireless communication module 84. The illustrated sensor 81 is, for example, a temperature sensor that detects temperature, a humidity sensor that detects humidity, a vibration sensor that detects impact, or a combined sensor that combines these.

  The CPU 82 controls the sensor 81, the memory 83, and the wireless communication module 84. That is, each function of the sensor node 1 is realized by the CPU 82 executing a predetermined program stored in the memory 83. A memory 83 is used for the storage unit 15 of the sensor node 1. The wireless communication module 84 communicates with the sensor node transceiver 2 and other sensor nodes by wireless communication. As wireless communication, wireless LAN, low power wireless, weak wireless, ZIGBEE, BLUETOOTH, or the like can be used. In the case of these wireless communications, the communication distance is several meters to several tens of meters.

  FIG. 3 is a diagram illustrating an example of a hardware configuration of the server 3.

  As illustrated, the server 3 uses a general-purpose computer system including a CPU 91, a memory 92, an external storage device 93, an interface device 94, and a bus 95 that connects these devices. it can. The interface device 94 is a device for connecting to the sensor node transmitter / receiver 2. For example, a serial port, a parallel port, a LAN port, a USB port, a CF card slot, or the like can be used.

  In this computer system, each function of the server 3 is realized by the CPU 91 executing a predetermined program loaded on the memory 92. Note that the memory 92 or the external storage device 93 is used for the storage unit 32 of the server 3. The server 3 may include an input device and an output device (not shown).

  Next, the environment information table 33 stored in the storage unit 32 of the server 3 will be described.

  FIG. 4 is a diagram illustrating an example of the environment information table 33. The environment information table 33 includes a sensor node ID 331, a time 332, and various types of environment information 333 to 335. The sensor node ID 331 is identification information for identifying each sensor node 1. Time 332 is the time at which the measurement unit 11 senses (measures / senses) various environmental information. The environmental information in the environmental information table 33 shown in the figure includes a temperature 333, humidity 334, and an impact 335.

  Next, a method for calculating the environmental information of the sensor node 1 will be described.

  FIG. 5 is a diagram schematically showing data transmission / reception between the sensor nodes 1. Each sensor node 1 can communicate with other sensor nodes 1 (so-called nearby) existing within a predetermined distance range. In the illustrated example, a circle 8a centered on the sensor node A1a indicates the communication reachable range of the sensor node A1a. That is, the sensor node A1a can transmit / receive data to / from the sensor node B1b, the sensor node C1c, and the sensor node D1d.

  In the illustrated example, a circle 8c centered on the sensor node C1c indicates a communication reachable range of the sensor node C1c. That is, the sensor node C1c can transmit / receive data to / from the sensor node A1a, the sensor node E1e, and the sensor node F1f.

  In addition, when communicating using weak radio | wireless, communication reachable distance is about 10 m. Therefore, each sensor node 1 can communicate with other sensor nodes 1 existing within 10 m. Moreover, when communicating using a specific low power radio | wireless, communication reachable distance is about 100 m, and it is suitable when a sensing area is large, such as in a large-scale warehouse.

  Each sensor node 1 transmits the sensing result value of the environmental information sensed by the sensor node 1 to the other sensor node 1 within the communication reach (so-called vicinity), and the other sensor node 1 Receive the sensing result value of the sensed environmental information. Then, each sensor node 1 calculates the environmental information of the own sensor node 1 using the sensing result value of the own sensor node 1 and the sensing result value of the other nearby sensor node 1.

  As a calculation method, for example, a method of calculating an average value of the sensing result value of the own sensor node 1 and the sensing result value of the other sensor node 1 can be considered. Specifically, the correction calculation unit 12 of the sensor node A1a shown in FIG. 5 uses the sensing result value of the own sensor node A1a and the sensing result values of the neighboring sensor nodes B1b, C1c, and D1d. The environmental information of A1a is calculated by the following calculation formula.

(S (A) + S (B) + S (C) + S (D)) / 4... Formula 1
S (A) is a sensing result value measured by the sensor node A1a. Similarly, S (B) and the like are sensing result values measured by the sensor node B1b and the like.

  In this way, more reliable environmental information can be calculated by using the sensing result values of other sensor nodes existing in the vicinity. That is, by calculating the average value, when there is a tendency that the sensing result value varies between the sensor nodes 1, it is possible to acquire more accurate environmental information that is spatially filtered.

  When calculating the average value, the sensing result value having an abnormal value may be excluded and the average value of the remaining normal sensing result values may be calculated. That is, when the sensing result value measured by any one of the sensor nodes 1 is an abnormal value, there is a possibility that the sensor node 1 is out of order. In addition, as an abnormal value, the case where the environmental information which one of the sensor nodes 1 measured clearly has a difference (distance) from other sensing result values, that is, the case where there is a difference equal to or greater than a predetermined threshold value can be considered. Moreover, as an abnormal value, the case where the sensing result value which one of the sensor nodes 1 measured exceeds a predetermined threshold value etc. can be considered.

  Specifically, when the sensing result value of the sensor node A1a shown in FIG. 5 indicates an abnormal value, the correction calculation unit 12 of the sensor node A1a excludes the sensing result value of the sensor node A1a by the following calculation formula: Then, the average value of the sensing result values of the neighboring sensor nodes B1b, C1c, and D1d is set as the environmental information of the own sensor node A1a.

(S (B) + S (C) + S (D)) / 3... Formula 2
When a sensing result value indicating an abnormal value exists, the sensor node 1 may transmit a sensor node ID indicating an abnormal value to the server 3 together with the calculated environment information. Thereby, the server 3 can specify the sensor node 1 in which the sensing function has failed.

  As another calculation method, a method of calculating (specifying) the maximum value or the minimum value among the sensing result value of the own sensor node 1 and the sensing result value of the other sensor node 1 in the vicinity can be considered. Specifically, the correction calculation unit 12 of the sensor node A1a shown in FIG. 5 uses the sensing result value of the own sensor node A1a and the sensing result values of the neighboring sensor nodes B1b, C1c, and D1d. The environmental information of A1a is calculated by the following formula.

max {S (A), S (B), S (C), S (D)} ... Formula 3
min {S (A), S (B), S (C), S (D)}... Formula 4
Note that max {} indicates that the maximum value is selected from the sensing result values in {}. Moreover, min {} indicates that the minimum value is selected from the sensing result values in {}. Thus, by calculating the maximum value or the minimum value, it is possible to predict a change in the spatial environment information. Specifically, it is assumed that each sensor node 1 measures the temperature of the package 4 installed in the space shown in FIG. In the communication reachable range 8a of the sensor node A1a, the temperature that is the sensing result value of the sensor node D1d is the highest, next the temperature of the sensor node B1b, then the temperature of the sensor node A1a, and then the sensor node C1c. Temperature. In this case, the sensor node A1a calculates (specifies) the temperature of the sensor node D1d having the maximum value instead of the temperature measured by itself as the environmental information of the sensor node A1a. In other words, the sensor node A1a preempts (estimates) the maximum temperature that will rise, and calculates it as its own temperature (environment information).

  Each sensor node 1 performs the calculation method described so far. For example, the sensor node C1c illustrated in FIG. 5 uses the sensing result value of the own sensor node C1c and the sensing result values of the neighboring sensor nodes A1a, E1e, and F1f to obtain the environment information of the own sensor node C1c as follows: Each is calculated by the calculation formula.

(S (C) + S (A) + S (E) + S (F)) / 4... Formula 5 (corresponding to Formula 1)
(S (A) + S (E) + S (F)) / 3... Formula 6 (corresponding to Formula 2)
max {S (C), S (A), S (E), S (F)}... Formula 7 (corresponding to Formula 3)
min {S (C), S (A), S (E), S (F)}... Formula 8 (corresponding to Formula 4)
Next, environmental information calculation processing of the sensor node 1 will be described.

  FIG. 6 is an environmental information calculation process flow diagram of the sensor node 1. First, the communication unit 14 of each sensor node 1 periodically transmits its own sensor node ID at a predetermined timing. Further, the communication unit 14 acquires the sensor node ID of the other sensor node transmitted by the other sensor node existing in the vicinity (within the communication reachable range) at a predetermined timing. Then, the communication unit 14 authenticates the sensor node ID received from the other sensor node (S11). That is, when the received sensor node ID is in an ID list (not shown) stored in advance in the storage unit 15, the communication unit 14 authenticates (determines) that the sensor node ID is a valid sensor node, and the sensor node ID Allows communication with other sensor nodes having.

  And the communication part 14 of each sensor node 1 receives the sensing result value of the said other sensor node from the other sensor node which succeeded in authentication. Moreover, the communication part 14 transmits the sensing result value which the measurement part 11 measured to the other sensor node which succeeded in authentication (S12). Note that the measurement unit 11 senses (measures / senses) environmental information (for example, temperature, humidity, impact, etc.) of the package 4 at a predetermined timing.

  Note that when the sensing result value is transmitted and received, the communication unit 14 may encrypt the sensing result value using an encryption technique such as a secret key encryption method or a public key encryption method. Each sensor node 1 that has received the encrypted sensing result value decrypts the sensor message using a predetermined key. Thereby, spoofing and alteration of the sensing result value can be prevented.

  And the correction | amendment calculating part 12 calculates the environmental information of the own sensor node 1 using the sensing result value of the own sensor node 1, and the sensing result value of other nearby sensor nodes, as demonstrated in FIG. (S13). Specifically, the correction calculation unit 12 calculates an average value, a maximum value, a minimum value, and the like, for example.

  And the communication part 14 discriminate | determines whether the communication path to the sensor node transmitter / receiver 2 exists (S14). That is, the communication unit 14 determines that a communication path exists when a predetermined signal (radio wave) is transmitted at a predetermined timing and a response signal to the signal is received from the sensor node transceiver 2. When the communication path to the sensor node transceiver 2 does not exist (S14: NO), the correction calculation unit 12 stores the environment information calculated in S13 in the storage unit 15 (S15). Then, when the communication unit 14 becomes ready for transmission, the communication unit 14 transmits the environment information stored in the storage unit 15 by the processes of S16 and S17.

  If there is a communication path to the sensor node transceiver 2 (S14: YES), the communication unit 14 performs mutual authentication processing in cooperation with the server 3 (S16). That is, the communication unit 14 transmits authentication information (sensor node ID, password, etc.) to the server 3 via the sensor node transceiver 2. The processing unit 31 of the server 3 determines whether or not the sensor node ID and password received from the sensor node 1 match an ID / password stored in an authentication DB (not shown) of the storage unit 32. If they match, the processing unit 31 of the server 3 transmits a communication permission message to the sensor node 1. Thereby, transmission / reception of data from an unauthorized third party such as impersonation can be prevented.

  If the communication unit 14 succeeds in authentication with the server 3, the communication unit 14 sends a message including the environment information calculated in S13 (or the environment information stored in the storage unit 15) to the server 3 via the sensor node transceiver 2. Transmit (S17). The communication unit 14 may encrypt the message using an encryption technique such as a secret key encryption method or a public key encryption method. The server 3 that has received the encrypted message decrypts the environment information using a predetermined key. Thereby, spoofing and data tampering can be prevented.

  The message includes a sensor node ID and time in addition to the environment information. Note that the sensor node ID is stored in advance in the storage unit 15 of the sensor node 1. The time is acquired from the clock / calendar function mounted on the sensor node 1.

  And the process part 31 of the server 3 acquires the message containing environmental information from each sensor node 1 via the sensor node transmitter / receiver 2, and memorize | stores it in the environment information table 33 (refer FIG. 4) of the memory | storage part 32. FIG. In this way, the server 3 stores the environmental information calculated by using the sensing result values of the other sensor nodes in the vicinity of each sensor node 1 in the environmental information table 33, thereby storing the transported goods 41 with higher accuracy. The state or transportation state can be managed centrally.

  Next, a process for calculating a calibration parameter for calibrating the sensing result value of the environmental information will be described. When the sensor node 1 is used for many years, the characteristics of the sensing function of the sensor 81 of the sensor node 1 may change (deteriorate) due to changes over time. In order to cope with the change in the characteristics of the sensing function, the parameter calculation unit 13 of the sensor node 1 periodically calculates a calibration parameter for calibrating the sensing result value of the environmental information.

  Specifically, the calculation formula for calibrating the sensing result value is a function of the sensing result value, and is represented by the following calculation formula, for example.

a × S (A) + b Formula 9
In this case, “a” and “b” are calibration parameters and are real coefficients. “S (A)” is a sensing result value measured by the sensor node A1a. When the sensing result value of the own sensor node 1 is substituted into the calculation formula 9, the parameter calculation unit 13 sets a calibration parameter (a, b) that is an average value of the sensing result values received from other nearby sensor nodes. calculate. The parameter calculation unit 13 can calculate the calibration parameter by the least square method when there are two or more sensing result values of other sensor nodes.

  When the parameter calculation unit 13 calculates the calibration parameter, all the sensor nodes 1 (the own sensor node and other nearby sensor nodes) need to be in the same environment. For example, when temperature sensing is performed, the parameter calculation unit 13 calculates a calibration parameter in a constant temperature warehouse or a constant temperature truck. In addition, the timing at which the parameter calculation unit 13 calculates the calibration parameter may be that the server 3 transmits a calibration parameter calculation instruction to each sensor node 1 via the sensor node transceiver 2. If the sensor node 1 cannot communicate with the sensor node transmitter / receiver 2, a device for issuing a calibration parameter calculation instruction, such as a transmitter, is installed in an environment suitable for calculation of calibration parameters such as in a constant temperature warehouse or constant temperature truck. It is good to do.

  Next, calibration parameter calculation processing of the sensor node 1 will be described.

  FIG. 7 is a flowchart of the calibration parameter calculation process of the sensor node 1. The communication unit 14 of the sensor node 1 receives a calibration parameter calculation instruction at a predetermined timing from the server 3 or the like (S21). For example, when calculating a calibration parameter of a temperature sensor, it is conceivable to receive a calibration parameter calculation instruction every three months.

  Then, the communication unit 14 of the sensor node 1 performs authentication processing with other nearby sensor nodes (S22). The authentication process is the same as the authentication process described in S11 of FIG. When the authentication is successful, the communication unit 14 receives the sensing result value from the other sensor node in the vicinity and transmits the sensing result value of the own sensor node to the other sensor node in the vicinity (S23).

  When the sensing result value of the own sensor node 1 is substituted into the calibration calculation formula (calculation formula 9 or the like), the parameter calculation unit 13 becomes an average value of the sensing result values received from other nearby sensor nodes. Calibration parameters (a, b) are calculated (S24). Then, the parameter calculation unit 13 stores the calculated calibration parameter in the storage unit 15 (S25).

  When the calibration parameter is stored in the storage unit 15, the sensor node 1 calculates the environmental information by substituting the self-sensing result value into the calibration formula using the calibration parameter in the storage unit 15 in S13 of FIG. Then, it is conceivable to transmit the calculated environment information to the server 3.

  Note that the calibration parameter calculation processing described so far may use a reference sensor installed in a certain environment. For example, a temperature sensor for temperature control in a constant temperature truck or a constant temperature warehouse may be used as a reference sensor.

  FIG. 8 is a configuration diagram when a reference sensor is used. In the constant temperature truck 9 or the like, a reference sensor 22 for controlling the environment to be constant is installed. Then, the sensor node transceiver 2 is added to the reference sensor 22 so that the reference sensing result value sensed by the reference sensor 22 can be transmitted to each sensor node 1. Then, the parameter calculation unit 13 of each sensor node 1 calculates the parameters of the calibration formula so that the sensing result value of the own sensor node 1 matches the reference sensing result value received from the reference sensor 22.

  FIG. 9 is a flowchart of a calibration parameter calculation process for the sensor node 1 using the reference sensor 22. The communication unit 14 of the sensor node 1 performs an authentication process with the reference sensor 22 (S31). The authentication process is the same as the authentication process described in S11 of FIG. When the authentication is successful, the communication unit 14 receives the reference sensing result value from the reference sensor 22 (S32).

  Then, the parameter calculation unit 13 calculates a calibration parameter that becomes the reference sensing result value when the sensing result value of the own sensor node 1 is substituted into the calibration formula (S33). Then, the parameter calculation unit 13 stores the calculated calibration parameter in the storage unit 15 (S34).

  The embodiment of the present invention has been described above.

  In the environmental information collection system of this embodiment, more reliable environmental information can be calculated by using sensing result values of other sensor nodes existing in the vicinity. That is, environmental information with high spatial resolution can be acquired.

  In this embodiment, the environment information calculated by each sensor node 1 at a predetermined timing is stored in the environment information table 33 of the server 3. Thereby, the storage state or the transport state of each transported item 41 can be managed in an integrated manner.

  In addition, the sensor node 1 of the present embodiment has a parameter calculation unit 13 and can automatically calibrate a change in characteristic of the sensing function due to a secular change.

  In the present embodiment, the sensor node 1 transmits the sensing result value and the like after performing the authentication process or the encryption process. This prevents spoofing and data tampering and provides reliable transportation quality information to consumers or transporters.

  In addition, this invention is not limited to said embodiment, Many deformation | transformation are possible within the range of the summary. For example, an environmental information collection system may be mounted on a truck bed (loading room, container, etc.).

  FIG. 10 shows an environmental information collecting system mounted on the truck bed 8. The environmental information collection system shown in the figure includes a sensor node 1, a sensor node transmitter / receiver 2, and a server 3 installed in each package 4, similarly to the environmental information collection system shown in FIG. 1. Then, the server 3 collects environmental information of each sensor node 1 transmitted via the sensor node transceiver 2.

  The environmental information collection system shown in the figure is the environmental information calculated by the sensor node 1 installed in the packaging body 4 by attaching an RFID (Radio Frequency Identification) tag 5 to each of the transport items 41 housed in the packaging body 4. May be written in each RFID tag 5. The RFID tag 5 is a minute wireless IC chip used for identification and management of articles. The RFID tag 5 has a memory for storing an identification code and the like, and transmits and receives data by wireless communication (non-contact) with the reader / writer 6 for the RFID tag 5. The reader / writer 6 writes the environmental information detected by the sensor node 1 under the control of the server 3 in the RFID tag 5. As a result, the environmental information calculated by the sensor node 1 can be recorded in each transport item 41, and the environmental information can be managed in units of the transport item 41.

  Further, the sensor node 1 of the present embodiment determines whether or not communication with the sensor node transceiver 2 is possible. If communication is not possible, the calculated environmental information is stored in the memory (FIG. 6: S14 and S15). However, the sensor node 1 has a relay function, transmits the sensor node ID and the calculated environmental information to other nearby sensor nodes, and relays the other sensor nodes to the sensor node transceiver 2 to calculate the environmental information. May be transmitted.

1 is an overall configuration diagram of an environment information collection system to which an embodiment of the present invention is applied. It is a figure which shows the hardware constitutions of a sensor node. It is a figure which shows the hardware structural example of a server. It is a figure which shows an example of an environment information table. It is the figure which showed typically transmission / reception of the data between each sensor node. It is a processing flow figure of environmental information calculation processing. It is a processing flowchart of a calibration parameter calculation process. It is a block diagram at the time of using a reference sensor. It is a processing flow figure of a calibration parameter calculation process at the time of using a standard sensor. It is a block diagram at the time of mounting an environmental information collection system on a truck.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1: Sensor node, 11: Measuring part, 12: Correction | amendment calculating part, 13: Parameter calculation part, 14: Communication part, 15: Memory | storage part, 2: Sensor node transmitter / receiver, 3: Server, 31: Processing part, 32 memory | storage Part 33: environmental information table 4: package body 41: transported goods

Claims (10)

An environmental information collection system that collects environmental information on transported goods,
Having a plurality of sensor nodes for measuring environmental information and a server for managing environmental information;
Each of the sensor nodes is
Measuring means for measuring environmental information of the transported goods in which the sensor node is installed at a predetermined timing;
A communication means for transmitting the measured environmental information to other sensor nodes within a predetermined communication range, and receiving environmental information measured by the other sensor nodes from the other sensor nodes;
Correction calculation means for calculating the environmental information of the own sensor node based on the environmental information of the own sensor node measured by the measuring means and the environmental information received from another sensor node;
A transmission unit that transmits the environmental information of the sensor node calculated by the correction calculation unit to the server;
The server
Environmental information storage means for storing the environmental information;
Receiving means for receiving the calculated environmental information from each of the sensor nodes;
An environmental information collection system comprising: a writing unit that stores the environmental information received by the receiving unit in the environmental information storage unit. The environmental information collection system according to claim 1,
The correction calculation means calculates the average value of the environmental information of the own sensor node measured by the measuring means and the environmental information received from the other sensor node, or the environmental information of the own sensor node measured by the measuring means and An environment information collection system characterized in that a maximum value or a minimum value is calculated from the environment information received from the other sensor node and used as the environment information of the own sensor node. An environmental information collection system that collects environmental information on transported goods,
Having a plurality of sensor nodes for measuring environmental information and a server for managing environmental information;
Each of the sensor nodes is
Measuring means for measuring environmental information of the transported goods in which the sensor node is installed at a predetermined timing;
A communication means for transmitting the measured environmental information to other sensor nodes within a predetermined communication range, and receiving environmental information measured by the other sensor nodes from the other sensor nodes;
Based on the environment information received from the other sensor node, calculate a calibration parameter for calibrating the environment information of the own sensor node measured by the measurement unit, and store the parameter calculation unit in the parameter storage unit;
Correction arithmetic means for reading out the calibration parameters from the parameter storage means and calibrating the environmental information of the own sensor node measured by the measurement means;
Transmission means for transmitting the environmental information of the sensor node calibrated by the correction calculation means to the server,
The server
Environmental information storage means for storing the environmental information;
Receiving means for receiving the calibrated environment information from each of the sensor nodes;
An environmental information collection system comprising: a writing unit that stores the environmental information received by the receiving unit in the environmental information storage unit. An environmental information collection system that collects environmental information on transported goods,
Having a plurality of sensor nodes for measuring environmental information and a server for managing environmental information;
Each of the sensor nodes is
Measuring means for measuring environmental information of the transported goods in which the sensor node is installed at a predetermined timing;
A communication means for receiving environmental information measured by the reference sensor from a reference sensor that measures environmental information serving as a reference;
Based on the environment information received from the reference sensor, calculate a calibration parameter for calibrating the environment information of the own sensor node measured by the measurement unit, and store the parameter calculation unit in the parameter storage unit;
Correction arithmetic means for reading out the calibration parameters from the parameter storage means and calibrating the environmental information of the own sensor node measured by the measurement means;
Transmission means for transmitting the environmental information of the sensor node calibrated by the correction calculation means to the server,
The server
Environmental information storage means for storing the environmental information;
Receiving means for receiving the calibrated environment information from each of the sensor nodes;
An environmental information collection system comprising: a writing unit that stores the environmental information received by the receiving unit in the environmental information storage unit. The environmental information collection system according to any one of claims 1 to 4,
The environmental information collection system, wherein the communication means and the transmission means of the sensor node perform authentication processing or encryption processing to transmit the environmental information. An environmental information collection method in an environmental information collection system for collecting environmental information of transport goods,
The environmental information collection system includes a plurality of sensor nodes that measure environmental information, and a server that manages environmental information.
Each of the sensor nodes is
At a predetermined timing, a measurement step for measuring environmental information of the transported goods in which the sensor node is installed,
A communication step of transmitting the measured environmental information to other sensor nodes within a predetermined communication range, and receiving environmental information measured by the other sensor nodes from the other sensor nodes;
An environment information calculating step for calculating the environment information of the own sensor node based on the environment information of the own sensor node measured in the measuring step and the environment information received from another sensor node;
Transmitting the environmental information of the own sensor node calculated in the environmental information calculating step to the server;
The server
An environment information storage unit for storing the environment information; and a processing unit;
The processor is
A receiving step of receiving the calculated environmental information from each of the sensor nodes;
An environment information collecting method comprising: performing a writing step of storing the environment information received in the receiving step in the environment information storage unit. The environmental information collecting method according to claim 6,
The environmental information calculation step of the sensor node calculates an average value of the environmental information of the own sensor node measured in the measurement step and the environmental information received from the other sensor node, or the own sensor node measured in the measurement step A maximum or minimum value is calculated from the environmental information received from the other sensor node and the environmental information received from the other sensor node, and used as the environmental information of the own sensor node. An environmental information collection method in an environmental information collection system for collecting environmental information of transport goods,
The environmental information collection system includes a plurality of sensor nodes that measure environmental information, and a server that manages environmental information.
Each of the sensor nodes is
At a predetermined timing, a measurement step for measuring environmental information of the transported goods in which the sensor node is installed,
A communication step of transmitting the measured environmental information to other sensor nodes within a predetermined communication range, and receiving environmental information measured by the other sensor nodes from the other sensor nodes;
Based on the environment information received from the other sensor node, calculate a calibration parameter for calibrating the environment information of the sensor node measured in the measurement step, and store the parameter in a parameter storage unit;
A calibration step of reading out the calibration parameters from the parameter storage unit and calibrating the environmental information of the sensor node measured in the measurement step;
Sending the environmental information of the sensor node calibrated in the calibration step to the server, and
The server
An environment information storage unit for storing the environment information; and a processing unit;
The processor is
Receiving the calibrated environment information from each of the sensor nodes;
An environment information collecting method comprising: performing a writing step of storing the environment information received in the receiving step in the environment information storage unit. An environmental information collection method in an environmental information collection system for collecting environmental information of transport goods,
The environmental information collection system includes a plurality of sensor nodes that measure environmental information, and a server that manages environmental information.
Each of the sensor nodes is
At a predetermined timing, a measurement step for measuring environmental information of the transported goods in which the sensor node is installed,
A communication step of receiving environmental information measured by the reference sensor from a reference sensor that measures the reference environmental information;
Based on the environment information received from the reference sensor, calculate a calibration parameter for calibrating the environment information of the own sensor node measured in the measurement step, and store the parameter in a parameter storage unit;
A calibration step of reading out the calibration parameters from the parameter storage unit and calibrating the environmental information of the sensor node measured in the measurement step;
Sending the environmental information of the sensor node calibrated in the calibration step to the server, and
The server
An environment information storage unit for storing the environment information; and a processing unit;
The processor is
Receiving the calibrated environment information from each of the sensor nodes;
An environment information collecting method comprising: performing a writing step of storing the environment information received in the receiving step in the environment information storage unit. The environmental information collection method according to any one of claims 6 to 9,
The environmental information collection method characterized in that the communication step and the transmission step of the sensor node perform authentication processing or encryption processing and transmit the environmental information.

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