JP2011228851A - Portable terminal and entry/exit management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable terminal and an entry/exit management system that appropriately reduces power consumption required for acquiring a positional data.SOLUTION: The portable terminal includes a position sensor, an acceleration sensor that measures a vertical acceleration and stores the measured acceleration in a storage unit, an analyzer that, when a periodic oscillation is detected from the measured acceleration stored in the storage unit, calculates the present oscillation period and amplitude value by using the measured acceleration, a change factor calculator that, when the present oscillation period is an oscillation period at the time of boarding in a service vehicle, calculates, as a change factor, a ratio of the present amplitude value to the amplitude value at a time of previous acquisition of the positional data, and a controller that determines whether or not the change factor of the amplitude value is out of a predetermined range, and that, when the change factor of the amplitude value is out of the predetermined range, causes the position sensor to acquire the positional data.

Description

  The present technology relates to a technology for managing the position of a farm worker.

  In farm work, for example, when the work time of each worker in each field is recorded, the production cost of the product harvested in each field is calculated, and the tendency of the worker's strength and weakness is analyzed. be able to. However, if the work time is recorded manually, it is troublesome and may be recorded incorrectly. Therefore, it is desirable to be able to automatically record the worker's work time.

  Therefore, the following techniques exist as techniques for automatically recording work time. Specifically, the worker has a portable terminal with a GPS (Global Positioning System) function, acquires GPS data, and records the time when the worker's current position is in the field as the work time.

  However, when GPS data is acquired, since the power consumption per time is large, frequent acquisition of GPS data significantly consumes the battery of the mobile terminal. In the case of a portable terminal, it is not desirable that the battery duration is shortened. Note that, in order to reduce power consumption, for example, if the acquisition frequency is reduced by simply increasing the acquisition interval of GPS data, the measurement accuracy of the working time is affected.

JP 2008-154004 A JP-A-2005-115722

  Thus, there is a problem that the power consumption becomes very large in order to measure the working time with high accuracy.

  Accordingly, an object of the present technology is to provide a technology for appropriately reducing power consumption required for acquisition of position data.

  This mobile terminal measures the acceleration in the vertical direction, measures the acceleration in the vertical direction, stores the measurement result in the storage device, and detects the periodic vibration from the measurement result stored in the storage device. When the current vibration period is the vibration period when the work vehicle is boarded, the analysis unit that calculates the current vibration period and amplitude value is used to calculate the current amplitude value relative to the amplitude value when the previous position data was acquired. A change rate calculation unit that calculates a ratio as a change rate of an amplitude value, and determines whether or not the change rate of the amplitude value is out of a predetermined range, and if the change rate of the amplitude value is out of a predetermined range, And a control unit that causes the sensor to acquire position data.

  It is possible to appropriately reduce the power consumption for obtaining the position data.

FIG. 1 is a functional block diagram of a mobile terminal according to an embodiment of the present technology. FIG. 2 is a diagram illustrating an example when a portable terminal is attached to an operator. FIG. 3 is a diagram illustrating an example of data stored in the agricultural field DB. FIG. 4 is a diagram illustrating an example of data stored in the entrance / exit history DB. FIG. 5 is a diagram illustrating an example of data stored in the entrance / exit history DB. FIG. 6 is a diagram illustrating a processing flow (first portion) of the mobile terminal according to the first embodiment. FIG. 7A is a diagram illustrating an example of an acceleration waveform when the cycle is constant, and FIG. 7B is a diagram illustrating an example of an acceleration waveform when the cycle is not constant. FIG. 8 is a diagram for explaining processing for calculating a vibration period and an amplitude value. FIG. 9 is a diagram illustrating a processing flow (second portion) of the mobile terminal according to the first embodiment. FIG. 10 is a diagram illustrating an example of an acceleration waveform. FIG. 11 is a diagram illustrating a processing flow (first portion) of the mobile terminal according to the second embodiment. FIG. 12 is a diagram illustrating a processing flow (second portion) of the mobile terminal according to the second embodiment. FIG. 13 is a system configuration diagram of a client / server system. FIG. 14 is a functional block diagram of a mobile terminal in a client / server system. FIG. 15 is a functional block diagram of a server in a client / server system. FIG. 16 is a functional block diagram of the mobile terminal according to the first aspect. FIG. 17 is a processing flow of the position data acquisition control method according to the second aspect. FIG. 18 is a functional block diagram of a computer.

  In order to suppress the battery consumption of the portable terminal carried by the worker, for example, an acceleration sensor is used to determine whether the worker is moving and to acquire GPS data only when the worker is moving. It is possible to reduce the number of acquisitions. Even if the acceleration sensor is always operated, the power consumption is small.

  However, in farm work, since it takes a long time to move during the work, the above-mentioned method cannot reduce the number of times of acquisition of GPS data so much. In farm work, an operator often travels on a riding farm vehicle (for example, a tractor, etc.) and enters a farm field while working on the riding farm truck. Since it is determined that the vehicle is moving while riding on the riding type agricultural work vehicle, the above-described method cannot reduce the number of times of acquiring the GPS data so much.

  For example, it is possible to determine whether the worker is walking using an acceleration sensor and acquire GPS data only during walking, but this is not considered walking while riding a riding farm vehicle. Therefore, GPS data will not be acquired. For this reason, with this method, it is not possible to measure the working time when the work is performed while entering the farm field while riding on a riding-type agricultural work vehicle.

  Therefore, in the embodiment of the present technology, when the worker is on the riding farm vehicle, the GPS data is acquired only when there is a possibility that the worker has entered or exited the farm field. Reduce the number of times. It should be noted that the vibration period and the amplitude value tend to be smaller when riding a riding farm vehicle than when walking. In general, since the ground is softer inside the field than outside the field, the vibration (ie, the amplitude value) when riding a riding farm work vehicle is greater when the person is inside the field than when the person is outside the field. Tend to be smaller. Furthermore, when the riding farm vehicle is, for example, a tractor, the attachment attached to the tractor comes into contact with the ground, so that vibration when riding on the tractor is smaller when the tractor is in the field. Therefore, in the embodiment of the present technology, it is determined whether or not there is a possibility that the passenger farm vehicle has entered and exited the field by determining whether or not the amplitude value has changed relatively.

[Embodiment 1]
FIG. 1 shows a functional block diagram of the mobile terminal 100 according to the first embodiment of the present technology. The mobile terminal 100 according to the first embodiment includes an acceleration sensor 101, an acceleration data storage unit 103, an acceleration data analysis unit 105, an analysis result storage unit 107, a control unit 109, and a change rate calculation unit 111. , An amplitude value storage unit 113, a GPS sensor 115, an agricultural field determination unit 117, an agricultural field DB 119, an entrance / exit management unit 121, an entrance / exit history DB 123, and an output unit 125. For example, as shown in FIG. 2, the portable terminal 100 is fixed to a measurement axis of the acceleration sensor 101 so as to be in the vertical direction and is attached to a worker's clothing or the like.

  The acceleration sensor 101 is, for example, a uniaxial acceleration sensor, measures vertical acceleration, and stores the measurement result in the acceleration data storage unit 103. The acceleration data analysis unit 105 calculates the vibration period and the amplitude value by analyzing the measurement result stored in the acceleration data storage unit 103 and stores it in the analysis result storage unit 107. The control unit 109 performs processing using the data stored in the analysis result storage unit 107 and causes the change rate calculation unit 111 to calculate the change rate of the amplitude value. The control unit 109 controls the GPS sensor 115 using the processing result of the change rate calculation unit 111 and the data stored in the entrance / exit history DB 123, and stores the data in the amplitude value storage unit 113. The change rate calculation unit 111 calculates the change rate of the amplitude value using the data stored in the analysis result storage unit 107 and the amplitude value storage unit 113 in accordance with an instruction from the control unit 109, and Output. The GPS sensor 115 acquires GPS data in response to an instruction from the control unit 109 and outputs the GPS data to the field determination unit 117. The agricultural field determination unit 117 determines the agricultural field using the GPS data acquired by the GPS sensor 115 and the data stored in the agricultural field DB 119, and outputs it to the entrance / exit management unit 121. The entrance / exit management unit 121 performs processing using the processing result of the farm field determination unit 117 and the data stored in the entrance / exit history DB 123 and stores the processing result in the entrance / exit history DB 123. The output unit 125 outputs the data stored in the entrance / exit history DB 123 to the outside.

  FIG. 3 shows an example of data stored in the agricultural field DB 119. In the example of FIG. 3, a field name column and a region information column are included. In the region information column, region coordinates of the field (for example, latitude and longitude of four corners of a rectangle) are set. Thus, the field information of each field is stored in advance in the field DB 119.

  FIG. 4 shows an example of data stored in the entrance / exit history DB 123. In the example of FIG. 4, a work field column, an entry time column, and an exit time column are included. In the column of the working field, the field name of the field where the operator entered is set. In addition, when it comes out of an agricultural field and it will be in the state which has not entered into any agricultural field, "outside of an agricultural field" is set to the column of a working agricultural field. The entry time column is set with the time of entry to the field (when the work field is “outside the field”, the time when the field is outside the field). The admission time is the same as the exit time in the previous record. Also, in the column of the leaving time, the time of leaving from the field (when the working field is “outside of the field”, the time of entering any field from outside the field) is set. In the entry / exit history DB 123, the exit time in the latest record is not set, and the time is set when a new record is added. For example, in FIG. 4, the latest record indicates that the field C has been entered at 16:00. Here, for example, when leaving the field C at 17:00, as shown in FIG. 5, a new record (working field: outside the field, entry time: 1700, exit time: not set) is added, 17:00 is set as the exit time in the record including the field C. Thus, the entry / exit history to the farm field is stored in the entry / exit history DB 123.

  Next, the operation of the mobile terminal 100 shown in FIG. 1 will be described with reference to FIGS. First, when the mobile terminal 100 is powered on, the acceleration sensor 101 starts measuring acceleration, and stores a measurement result including the measured acceleration value and measurement time in the acceleration data storage unit 103 (FIG. 6 :). Step S1). Then, the acceleration data analysis unit 105 uses the measurement result stored in the acceleration data storage unit 103 periodically or at an arbitrary timing, in the acceleration waveform represented by the measured acceleration value ( Search for local maximum or minimum point. In the case of the second and subsequent processes, extreme points are searched for the section from the previous process to the current process in the acceleration waveform. When the extreme point can be detected, the acceleration value (that is, the maximum value or the minimum value) of the extreme point and the measurement time are stored in the analysis result storage unit 107. If no local maximum point is detected (step S3: No route), the process returns to step S1.

On the other hand, when the local maximum point is detected (step S3: Yes route), the acceleration data analysis unit 105 determines whether or not the vibration is oscillating at a constant cycle by using the data stored in the analysis result storage unit 107. (Step S5). Specifically, first, the latest N maximum values and measurement times are acquired from the analysis result storage unit 107. For example, it represents the acceleration values _{v 1,} v 2, · · ·, and _{v N,} representing the measurement time _{t 1,} t 2, · · ·, and _{t N.} Note that the value of N is set in advance. Then, N-1 time differences T between the maximum values are calculated, and the maximum value max (T) and the minimum value min (T) are specified from the calculated time differences T. Then, the maximum value max (T) / minimum value min (T) is calculated, and it is determined whether the calculated value is less than a predetermined threshold value a. Note that the threshold value a is a parameter that represents the upper limit of the allowable range of period variation, and when “max (T) / min (T) <a” is satisfied, it is regarded as periodic vibration.

For example, FIG. 7A schematically shows an acceleration waveform when the period is constant, and FIG. 7B schematically shows an acceleration waveform when the period is not constant. 7A and 7B, the vertical axis represents the acceleration value, and the horizontal axis represents the time. Here, it is assumed that N = 3 and a = 2. For example, in the case of N = 3, the measurement time _{t 1} of the maximum value _{v 1} and _{v 1,} and the measurement time _{t 2} of the maximum value _{v 2} and _{v 2,} and the measurement time _{t 3} maxima _{v 3} and _{v 3} Analysis Obtained from the result storage unit 107, the time difference T between the maximum values is calculated. For example, in FIG. 7A, t ₃ −t ₂ = 220 milliseconds (ms) and t ₂ −t ₁ = 200 milliseconds, the maximum value max (T) is 220 milliseconds, and the minimum value min ( T) is 200 milliseconds. Here, max (T) / min (T) = 220/200 = 1.1, which satisfies “max (T) / min (T) <2”, and therefore is determined to vibrate with a constant period. .

In FIG. 7B, t ₃ −t ₂ = 150 milliseconds, t ₂ −t ₁ = 600 milliseconds, the maximum value max (T) is 600 milliseconds, and the minimum value min (T). Is 150 milliseconds. Here, max (T) / min (T) = 600/150 = 4, and “max (T) / min (T) <2” is not satisfied, so that it is determined that the vibration is not periodic.

  And when it is judged that it is vibrating with a fixed period (step S5: Yes route), ie, when a periodic vibration is detected from a measurement result, it transfers to the process of step S7. On the other hand, if it does not vibrate at a constant cycle (step S5: No route), the process returns to step S1.

  In step S7, the acceleration data analysis unit 105 uses the data stored in the analysis result storage unit 107 to calculate the current vibration period and amplitude value, and the calculation result is used as the analysis result storage unit 107. (Step S7). The processing in this step will be described with reference to FIG.

First, the latest N maximum values and measurement times and the latest N minimum values are acquired from the analysis result storage unit 107. For example, the maximum value is represented as v ₁ , v ₂ ,..., V _N , the measurement time is represented as t ₁ , t ₂ ,..., T _N, and the minimum value is represented by w ₁ , w ₂ ,. , expressed as _{w N.} The vibration period is calculated by (t _N −t ₁ ) / (N−1). The vibration period is equal to the average of the time differences T between the maximum values. The amplitude value can be calculated by (v ₁ −w ₁ + v ₂ −w ₂ +,... + V _N −w _N ) / N. In Figure 8, for example, N = 3, the measurement time _{t 1} of the maximum value _{v 1} and _{v 1,} and the measurement time _{t 2} of the maximum value _{v 2} and _{v 2,} the maximum value _{v 3} and _{v 3} the measurement time t ₃ , the minimum value w ₁ , the minimum value w _2, and the minimum value w ₃ are acquired from the analysis result storage unit 107. Then, as shown in FIG. 8, oscillation period _{becomes (t 3 -t 1) / 2} = 420/2 = 210 ms. The amplitude value is (v ₁ −w ₁ + v ₂ −w ₂ + v ₃ −w ₃ ) / 3 = (200 mG + 190 mG + 180 mG) / 3 = 190 mG.

  Thereafter, the control unit 109 determines whether or not the vibration period stored in the analysis result storage unit 107 is equal to or less than a certain value (step S9). Note that, as described above, the vibration cycle is smaller when riding on a riding farm vehicle than when walking. Therefore, an upper limit value b (for example, b = 250 milliseconds) of the vibration cycle when riding the riding-type agricultural work vehicle is set in advance, and in this step, is the vibration cycle calculated in step S7 equal to or less than the upper limit value b? By judging, it is judged whether it is a vibration period at the time of riding a riding-type agricultural work vehicle. If the vibration cycle exceeds a certain value (step S9: No route), it is determined that it is not the vibration cycle when riding the riding type agricultural work vehicle, and the process returns to step S1.

  On the other hand, when the vibration cycle is equal to or less than a certain value (step S9: Yes route), it is determined that it is the vibration cycle when riding the riding type agricultural work vehicle, and the process proceeds to step S11. Then, the control unit 109 determines whether a past amplitude value is stored in the amplitude value storage unit 113 (step S11). When the past amplitude value is not stored in the amplitude value storage unit 113 (step S11: No route), that is, in the case of the first processing, the control unit 109 stores the amplitude value calculated in step S7 as the analysis result. The data is read from the unit 107 and stored in the amplitude value storage unit 113 (step S13). Then, it returns to step S1. In this way, in the first process, the past amplitude value is not yet stored in the amplitude value storage unit 113, and therefore the rate of change of the amplitude value cannot be calculated in the subsequent processes. Therefore, the amplitude value calculated this time is stored in the amplitude value storage unit 113, and the subsequent processing is not performed, and the process returns to step S1.

  On the other hand, when the past amplitude value is stored in the amplitude value storage unit 113 (step S11: Yes route), that is, in the case of the second and subsequent processing, the processing of step S13 (FIG. 9) is performed via the terminal A. Migrate to

  Shifting to the description of FIG. 9, after the terminal A, the control unit 109 instructs the change rate calculation unit 111 to calculate the change rate of the amplitude value. Then, the change rate calculation unit 111 calculates the change rate of the amplitude value using the data stored in the analysis result storage unit 107 and the amplitude value storage unit 113 in accordance with an instruction from the control unit 109, and calculates The obtained value is output to the control unit 109 (FIG. 9: Step S15). Specifically, the current amplitude value is read from the analysis result storage unit 107, the past amplitude value is read from the amplitude value storage unit 113, and the ratio of the current amplitude value to the past amplitude value is expressed as the rate of change in amplitude value (= It is calculated as (current amplitude value / past amplitude value).

  When the control unit 109 receives the change rate of the amplitude value from the change rate calculation unit 111, the change rate of the amplitude value is within a predetermined range (for example, the lower limit value c = 0.5, the upper limit value d = 1.5). It is determined whether it is off (step S17). When the change rate of the amplitude value is within the predetermined range (step S17: No route), the process returns to the process of step S1 via the terminal B.

  On the other hand, when the change rate of the amplitude value is out of the processing range (step S17: Yes route), the control unit 109 reads the amplitude value calculated in step S7 from the analysis result storage unit 107, and the amplitude value storage unit It stores in 113 (step S19). In addition, the control unit 109 instructs the GPS sensor 115 to acquire GPS data. And the GPS sensor 115 acquires GPS data according to the instruction | indication from the control part 109, and outputs the acquired GPS data to the agricultural field determination part 117 (step S21).

Then, when receiving the GPS data from the GPS sensor, the farm field determination unit 117 identifies and identifies the farm field including the current position of the portable terminal 100 using the GPS data and the data stored in the farm field DB 119. The field name of the field is output to the entrance / exit management unit 121 (step S23). For example, as shown in FIG. 3, the area coordinates of the field A are (x ₁ , y ₁ ), (x ₂ , y ₁ ), (x ₂ , y ₂ ), (x ₁ , y ₂ ) If the current position of the terminal 100 is (x, y), if x ₁ <= x <= x ₂ and y ₁ <= y <= y ₂ are satisfied, the current position of the mobile terminal 100 is A field A is specified as an included field. When the current position of the mobile terminal 100 is not included in any field, the field determination unit 117 determines that the field is outside the field and outputs information indicating the outside of the field to the entrance / exit management unit 121.

  When the entry / exit management unit 121 receives information indicating the field name of the field or the field outside the field from the field determination unit 117, the field changes using the received information and the data stored in the entry / exit history DB 123. It is determined whether or not (step S25). Specifically, it is determined whether the information received from the field determination unit 117 is different from the work field of the latest record in the entry / exit history DB 123. If the information is different, it is determined that the field has changed. For example, when “outside the field” is set in the work field of the latest record in the entry / exit history DB 123 and the field name of the field is received from the field determination unit 117, the field has changed (that is, to the field). Judged). Further, for example, when the field name of any field is set in the work field of the latest record in the entry / exit history DB 123 and the information received from the field determination unit 117 is information indicating that the field is out of the field, the field changes. (I.e., it came out of the field). If the field has not changed (step S25: No route), the process returns to step S1 via the terminal B.

  On the other hand, when the field has changed (step S25: Yes route), the entrance / exit management unit 121 registers the entrance / exit history in the entrance / exit history DB 123 (step S27). Specifically, the current time is set as the latest record exit time in the entrance / exit history DB 123, and a new record including the information received from the field determination unit 117 as the work field and the current time as the entrance time is entered / exited. It adds to history DB123. In the present embodiment, “current time” refers to the time at which GPS data is received. Thereafter, the process returns to step S1 via the terminal B. Then, for example, the process is repeated until the mobile terminal 100 is turned off.

  By carrying out the processing as described above, GPS data can be acquired when there is a possibility that the passenger farm vehicle has entered and exited the field.

  For example, the operation of the mobile terminal 100 when an acceleration waveform as shown in FIG. 10 is measured will be described. Here, it is assumed that the values of the parameters (N, c, d) described above are N = 2, c = 0.5, and d = 1.5. For example, when the acceleration data analysis unit 105 detects the local maximum point A, it determines whether or not it vibrates at a constant cycle. Here, it is assumed that it is determined to vibrate at a constant cycle (hereinafter, the same applies to the maximum points B to G). Then, the acceleration data analysis unit 105 calculates the vibration period and amplitude value at the time point of the maximum point A, and the control unit 109 determines whether the vibration period at the time point of the maximum point A is equal to or less than a certain value (that is, riding farm work Judgment whether it is the vibration cycle when the car is on board). Here, it is assumed that the vibration period is determined to be equal to or less than a certain value (hereinafter, the same applies to the maximum points B to G). Then, the control unit 109 causes the change rate calculation unit 111 to calculate the change rate of the amplitude value, and determines whether the calculated change rate of the amplitude value is out of a predetermined range. Here, it is assumed that 2.0 is calculated as the change rate of the amplitude value by the change rate calculation unit 111. Then, the control unit 109 determines that the change rate (= 2.0) of the amplitude value is out of the predetermined range, and causes the GPS sensor 115 to acquire GPS data. Further, the control unit 109 stores the amplitude value (= 200 mG) at the time of the maximum point A in the amplitude value storage unit 113.

  Thereafter, each time the acceleration data analysis unit 105 sequentially detects the maximum points B to G, similarly, the change rate of the amplitude value at that time is obtained, and it is determined whether the change rate of the amplitude value is out of the predetermined range. . For example, when the maximum point B is detected, the amplitude value at the time of the maximum point B is 200 mG, and the amplitude value at the time of the maximum point A (= 200 mG) is stored in the amplitude value storage unit 113, so the rate of change The calculation unit 111 calculates the change rate of the amplitude value = 1.0 (= 200 mG / 200 mG). Then, control unit 109 determines that the change rate of the amplitude value is within a predetermined range, and does not issue an instruction to GPS sensor 115.

  When the local maximum point C is detected, the amplitude value at the time point of the local maximum point C is 200 mG, and the amplitude value storage unit 113 stores the amplitude value at the time point of the local maximum point A (= 200 mG). The rate calculation unit 111 calculates the change rate of the amplitude value = 1.0 (= 200 mG / 200 mG). Then, control unit 109 determines that the change rate of the amplitude value is within a predetermined range, and does not issue an instruction to GPS sensor 115.

  Further, when the maximum point D is detected, the amplitude value at the time of the maximum point D is 210 mG, and the amplitude value storage unit 113 stores the amplitude value at the time of the maximum point A (= 200 mG). The rate calculation unit 111 calculates the change rate of the amplitude value = 1.05 (= 210 mG / 200 mG). Then, control unit 109 determines that the change rate of the amplitude value is within a predetermined range, and does not issue an instruction to GPS sensor 115.

  When the local maximum point E is detected, the amplitude value at the time point of the local maximum point E is 140 mG, and the amplitude value storage unit 113 stores the amplitude value at the time point of the local maximum point A (= 200 mG). The rate calculation unit 111 calculates the change rate of the amplitude value = 0.7 (= 140 mG / 200 mG). Then, control unit 109 determines that the change rate of the amplitude value is within a predetermined range, and does not issue an instruction to GPS sensor 115.

  Furthermore, when the local maximum point F is detected, the amplitude value at the time point of the local maximum point F is 80 mG, and the amplitude value storage unit 113 stores the amplitude value at the time point of the local maximum point A (= 200 mG). The rate calculation unit 111 calculates the change rate of the amplitude value = 0.4 (= 80 mG / 200 mG). Then, the control unit 109 determines that the change rate of the amplitude value is out of the predetermined range, and causes the GPS sensor 115 to acquire GPS data. Further, the control unit 109 stores the amplitude value (= 80 mG) at the time of the maximum point F in the amplitude value storage unit 113.

  When the local maximum point G is detected, the amplitude value at the time point of the local maximum point G is 80 mG, and the amplitude value storage unit 113 stores the amplitude value at the time point of the local maximum point F (= 80 mG). The rate calculation unit 111 calculates the change rate of the amplitude value = 1.0 (= 80 mG / 80 mG). Then, control unit 109 determines that the change rate of the amplitude value is within a predetermined range, and does not issue an instruction to GPS sensor 115.

  In FIG. 10, the amplitude value is about 200 mG from the maximum point A to the maximum point D, and the amplitude value is small in the vicinity of the maximum point E. In other words, there is a possibility that a farm farm vehicle has entered the field near the local maximum point E, and it is desirable to acquire GPS data immediately after the local maximum point E. As described above, when the acceleration waveform as shown in FIG. 10 is measured, GPS data is acquired at the time of the local maximum point F after the local maximum point A. It can be said that the GPS data could be acquired when there is a possibility of the failure. In this way, by acquiring GPS data when there is a possibility of entering a farm with a riding-type agricultural work vehicle, the number of times GPS data can be acquired can be reduced, and battery consumption of the mobile terminal can be suppressed. Can do.

  In addition, when entering a farm field while riding on a riding-type agricultural work vehicle, the change rate of the amplitude value becomes small. Therefore, when the user is out of the field, in step S17 described above, it is determined whether there is a possibility of entering the field by determining whether the change rate of the amplitude value is below the lower limit value of the predetermined range. When the value is below the lower limit, the process may proceed to step S19. On the other hand, when leaving the farm field while riding on a riding-type farm vehicle, the rate of change of the amplitude value increases. Therefore, when the user is in the field, in step S17 described above, it is determined whether or not there is a possibility of having gone out of the field by determining whether the rate of change of the amplitude value exceeds the upper limit value of the predetermined range. If the upper limit value is exceeded, the process may proceed to step S19. In addition, what is necessary is just to judge from the work field of the newest record in the entrance / exit log | history DB123 whether it was in the field or it was in the field.

[Embodiment 2]
Next, a second embodiment will be described. In the second embodiment, a process of determining whether the worker is walking is added to the process of the first embodiment, and GPS data is acquired at regular intervals if walking. Note that while the worker is on the riding-type agricultural work vehicle, GPS data is acquired when there is a possibility that the worker has entered and exited the farm field, as in the first embodiment.

  Mobile terminal 100 according to the present embodiment has the same configuration as that shown in FIG. Hereinafter, processing contents of the mobile terminal 100 according to the present embodiment will be described with reference to FIGS. 11 and 12. The same parts as those in the first embodiment will be described briefly.

  First, when the mobile terminal 100 is turned on, the acceleration sensor 101 starts measuring acceleration and stores a measurement result including the measured acceleration value and measurement time in the acceleration data storage unit 103 (FIG. 11: Step S31). Then, the acceleration data analysis unit 105 uses the measurement result stored in the acceleration data storage unit 103 periodically or at an arbitrary timing, in the acceleration waveform represented by the measured acceleration value ( Search for local maximum or minimum point. In the case of the second and subsequent processes, extreme points are searched for the section from the previous process to the current process in the acceleration waveform. When the extreme point can be detected, the acceleration value (that is, the maximum value or the minimum value) of the extreme point and the measurement time are stored in the analysis result storage unit 107. If no local maximum point is detected (step S33: No route), the process returns to step S31.

  On the other hand, when the local maximum point is detected (step S33: Yes route), the acceleration data analysis unit 105 determines whether or not it is oscillating at a constant cycle by using the data stored in the analysis result storage unit 107. (Step S35). If it is determined that the vibration is constant (step S35: Yes route), that is, if periodic vibration is detected from the measurement result, the process proceeds to step S37. On the other hand, if it does not vibrate at a constant cycle (step S35: No route), the process returns to step S31.

  In step S37, the acceleration data analysis unit 105 uses the data stored in the analysis result storage unit 107 to calculate the current vibration period and amplitude value, and the calculation result is used as the analysis result storage unit 107. (Step S37). Note that the processing up to this point is the same as steps S1 to S7 (FIG. 6) in the first embodiment.

  Thereafter, the control unit 109 determines whether or not the user is walking using the vibration period and the amplitude value stored in the analysis result storage unit 107 (step S39). Specifically, a lower limit value (for example, 300 milliseconds) of a vibration cycle during walking and a lower limit value (for example, 500 mG) of an amplitude value during walking are set in advance and stored in the analysis result storage unit 107. When each of the vibration period and the amplitude value is equal to or greater than the corresponding lower limit value, it is determined that the user is walking. If it is determined that the user is not walking (step S39: No route), the process proceeds to step S43.

  On the other hand, when it is determined that the user is walking (step S39: Yes route), the control unit 109 determines whether a predetermined time has elapsed since the previous GPS data was acquired (step S41). If the fixed time has not elapsed since the last time GPS data was acquired (step S41: No route), the process returns to step S31. On the other hand, if a predetermined time has elapsed since the last GPS data was acquired (step S41: Yes route), the process proceeds to step S53 via the terminal C.

  Moreover, it transfers to step S43 and the control part 109 judges whether the vibration period stored in the analysis result storage part 107 is below a fixed value (step S43). If the vibration cycle exceeds a certain value (step S43: No route), it is determined that it is not the vibration cycle at the time of riding the riding type agricultural work vehicle, and the process returns to step S31.

  On the other hand, when the vibration period is equal to or less than a certain value (step S43: Yes route), it is determined that the vibration period is when the riding type farm work vehicle is boarded, and the process proceeds to step S45. And the control part 109 judges whether the past amplitude value is stored in the amplitude value storage part 113 (step S45). When the past amplitude value is not stored in the amplitude value storage unit 113 (step S45: No route), that is, in the case of the first processing, the control unit 109 stores the amplitude value calculated in step S7 as the analysis result. The data is read from the unit 107 and stored in the amplitude value storage unit 113 (step S47). Then, it returns to step S31.

  On the other hand, when the past amplitude value is stored in the amplitude value storage unit 113 (step S45: Yes route), that is, in the case of the second and subsequent processing, the processing of step S49 (FIG. 12) is performed via the terminal D. Migrate to Note that the processing in steps S43 to S47 is the same as steps S9 to S13 (FIG. 6) in the first embodiment.

  Shifting to the description of FIG. 12, after the terminal D, the control unit 109 instructs the change rate calculation unit 111 to calculate the change rate of the amplitude value. Then, the change rate calculation unit 111 calculates the change rate of the amplitude value using the data stored in the analysis result storage unit 107 and the amplitude value storage unit 113 in accordance with an instruction from the control unit 109, and calculates The obtained value is output to the control unit 109 (FIG. 12: Step S49).

  Then, when receiving the change rate of the amplitude value from the change rate calculation unit 111, the control unit 109 determines whether the change rate of the amplitude value is out of a predetermined range (for example, a range from 0.5 to 1.5). (Step S51). When the change rate of the amplitude value is within the predetermined range (step S51: No route), the process returns to the process of step S31 via the terminal E. On the other hand, when the change rate of the amplitude value is out of the processing range (step S51: Yes route), the process proceeds to step S53.

  Then, after the terminal C or step S51, the control unit 109 reads the amplitude value calculated in step S37 from the analysis result storage unit 107 and stores it in the amplitude value storage unit 113 (step S53). In addition, the control unit 109 instructs the GPS sensor 115 to acquire GPS data. And the GPS sensor 115 acquires GPS data according to the instruction | indication from the control part 109, and outputs the acquired GPS data to the agricultural field determination part 117 (step S55).

  Then, when receiving the GPS data from the GPS sensor, the farm field determination unit 117 identifies and identifies the farm field including the current position of the portable terminal 100 using the GPS data and the data stored in the farm field DB 119. The field name of the field is output to the entrance / exit management unit 121 (step S57). When the current position of the mobile terminal 100 is not included in any field, the field determination unit 117 determines that the field is outside the field and outputs information indicating the outside of the field to the entrance / exit management unit 121.

  When the entry / exit management unit 121 receives information indicating the field name of the field or the field outside the field from the field determination unit 117, the field changes using the received information and the data stored in the entry / exit history DB 123. It is determined whether or not (step S59). If the field has not changed (step S59: No route), the process returns to step S31 via the terminal E.

  On the other hand, when the agricultural field has changed (step S59: Yes route), the entrance / exit management unit 121 registers the entrance / exit history in the entrance / exit history DB 123 (step S61). Thereafter, the process returns to step S31 via the terminal E. Then, for example, the process is repeated until the mobile terminal 100 is turned off. Note that the processes in steps S49 to S61 are the same as steps S15 to S27 (FIG. 9) in the first embodiment.

  By performing the processing as described above, it is possible to cope with a case where a case where an operator enters and exits the farm field with a riding farm vehicle and a case where the worker walks and enters the farm field are mixed.

[Other embodiments]
In the example described above, the stand-alone type embodiment has been described. However, it can be modified to a client-server type. For example, FIG. 13 shows a system configuration when implemented in a client-server system. As shown in FIG. 13, a mobile terminal 200 (200a to 200c in FIG. 13) and a server 3 are connected to a network 1 such as the Internet, for example, wirelessly or by wire.

  FIG. 14 shows a functional block diagram of the mobile terminal 200. The mobile terminal 200 includes an acceleration sensor 101, an acceleration data storage unit 103, an acceleration data analysis unit 105, an analysis result storage unit 107, a control unit 109, a change rate calculation unit 111, an amplitude value storage unit 113, A GPS sensor 115 and a transmission unit 201 are included. The transmission unit 201 transmits the GPS data acquired by the GPS sensor 115 to the server 3. The acceleration sensor 101, the acceleration data storage unit 103, the acceleration data analysis unit 105, the analysis result storage unit 107, the control unit 109, the change rate calculation unit 111, the amplitude value storage unit 113, and the GPS sensor 115. Is the same as that described in the first or second embodiment.

  FIG. 15 shows a functional block diagram of the server 3. The server 3 includes a receiving unit 301, an agricultural field determination unit 117, an agricultural field DB 119, an entrance / exit management unit 121, and an entrance / exit history DB 123. The receiving unit 301 receives GPS data from the mobile terminal 200 and outputs the GPS data to the farm field determining unit 117. Note that the agricultural field determination unit 117, the agricultural field DB 119, the entrance / exit management unit 121, and the entrance / exit history DB 123 are the same as those described in the first or second embodiment. However, in the case of a client / server system, data as shown in FIG. 4 is stored in the entrance / exit history DB 123 for each portable terminal 200.

  When the processing described in the first or second embodiment is performed in the client / server system, the portable terminal 200 performs the processing in steps S1 to S21 (or steps S31 to S55). After step S21 (or step S55), the GPS data acquired by the GPS sensor 115 and the identification information of the mobile terminal 200 may be transmitted to the server 3.

  Further, when the server 3 receives the GPS data and the identification information of the mobile terminal 200 from the mobile terminal 200, the process of steps S23 to S27 (or steps S57 to S61) may be performed. In this case, in step S27 (or step S61), the entrance / exit history corresponding to the mobile terminal 200 that is the source of the GPS data is updated in the entrance / exit history DB 123. Note that the server 3 may determine a field including the current position of the mobile terminal 200 and return the determination result to the mobile terminal 200.

  Although the embodiment of the present technology has been described above, the present technology is not limited to this. For example, the functional block diagrams of the mobile terminals 100 and 200 and the server 3 described above do not necessarily correspond to an actual program module configuration. Similarly, the configuration of the data storage unit is merely an example. Also in the processing flow, if the processing result does not change, the processing order can be changed. Further, it may be executed in parallel.

  Note that the portable terminals 100 and 200 and the server 3 described above are computer devices, and a display connected to a memory 2501, a CPU 2503, a hard disk drive (HDD) 2505, and a display device 2509 as shown in FIG. A control unit 2507, a drive device 2513 for a removable disk 2511, an input device 2515, and a communication control unit 2517 for connecting to a network are connected by a bus 2519. An operating system (OS) and an application program for executing the processing in this embodiment are stored in the HDD 2505, and are read from the HDD 2505 to the memory 2501 when executed by the CPU 2503. If necessary, the CPU 2503 controls the display control unit 2507, the communication control unit 2517, and the drive device 2513 to perform necessary operations. Further, data in the middle of processing is stored in the memory 2501 and stored in the HDD 2505 if necessary. In an embodiment of the present technology, an application program for performing the above-described processing is stored in a computer-readable removable disk 2511 and distributed, and installed from the drive device 2513 to the HDD 2505. In some cases, the HDD 2505 may be installed via a network such as the Internet and the communication control unit 2517. Such a computer apparatus realizes various functions as described above by organically cooperating hardware such as the CPU 2503 and the memory 2501 described above, the OS, and necessary application programs.

  When the mobile terminals 100 and 200 are mobile phones, the HDD 2505 and the drive device 2513 are not provided. In that case, a flash memory type memory or a recording medium interface is provided instead. Further, the mobile terminals 100 and 200 may not include the display control unit 2507 or the display device 2509.

  The present embodiment can be summarized as follows.

  The portable terminal includes a position sensor (FIG. 16: 1501), an acceleration sensor (FIG. 16: 1503) that measures acceleration in the vertical direction, and stores the measurement result in the storage device (FIG. 16: 1511). When periodic vibration is detected from the stored measurement results, an analysis unit (FIG. 16: 1505) that calculates the current vibration cycle and amplitude value using the measurement results, and the current vibration cycle is a vehicle ride Change rate calculation unit (FIG. 16: 1507) that calculates the ratio of the current amplitude value to the amplitude value at the time when the previous position data was acquired as the change rate of the amplitude value, and the change in the amplitude value It is determined whether or not the rate is out of the predetermined range, and when the change rate of the amplitude value is out of the predetermined range, the control unit that causes the position sensor to acquire position data (FIG. 16: 150). ) And a.

  Thus, the number of acquisitions of position data can be reduced by acquiring the position data only when the change rate of the amplitude value is out of the predetermined range. That is, it is possible to reduce the power consumption required to acquire the position data.

  In addition, the mobile terminal described above stores a field database that stores region information of each field, a field information that includes information indicating that the field identifier is or is outside the field, and a record that includes an entry time and an exit time. From the entry / exit history database, the position data acquired by the position sensor, and the region information stored in the field database, it is determined whether the position of the mobile terminal is in any field or outside the field. If the field is within the field, the field determination unit that identifies the identifier of the specific field including the position of the mobile terminal, and the identifier of the specific field that is the processing result of the field determination unit or that is outside the field If the first field information including the information is different from the second field information which is the field information included in the latest record stored in the entry / exit history database, An entry / exit management unit that sets a new record including the first field information and the current time as the entry time to the entry / exit history database is set in the latest record as the entry time. Also good.

  In this way, the entry / exit time to the field is registered, so that the work time on the field can be calculated. Note that the amplitude value calculated from the measurement result of the acceleration sensor differs between when inside the field and when outside the field while riding a work vehicle (such as a tractor). If it is out of the range, there is a high possibility that the farm has entered and exited. Therefore, since the position data can be acquired at an appropriate timing, the entrance time and the exit time can be acquired with high accuracy.

  Furthermore, when the control unit described above includes information indicating that the latest record stored in the entry / exit history database includes information indicating that the field is outside the field, the rate of change of the amplitude value is predetermined. If it is below the lower limit of the range, the position sensor acquires position data, and the field information contained in the latest record stored in the entry / exit history database is When the identifier is included, it is determined whether the change rate of the amplitude value exceeds the upper limit value of the predetermined range, and if it exceeds, the position data may be acquired by the position sensor. Since the ground is softer inside the field than outside the field (for example, roads, etc.), the vibration (that is, the amplitude value) when riding on the work vehicle is smaller when inside the field than when outside the field. Become. Therefore, the change rate of the amplitude value is small when entering the field from outside the farm field while riding the work vehicle, and the change rate of the amplitude value is large when leaving the farm field while riding the work vehicle. That is, when outside the field, it was determined whether the change rate of the amplitude value was below the lower limit of the predetermined range, so that it was determined that there was a possibility of entering any field, and the field was entered The position data may be acquired only when there is a possibility. On the other hand, if you are in the field, you can determine whether there is a possibility that you have exited from any field by determining whether the rate of change of the amplitude value exceeds the upper limit of the predetermined range. The position data may be acquired only when there is a possibility.

  In addition, when the vibration period and amplitude value at the present time are the vibration period and amplitude value at the time of walking, the control unit described above determines whether a certain time has elapsed since the previous position data was acquired, and a certain time has elapsed. If it does, you may make it make a position sensor acquire position data. In this way, it is possible to cope with, for example, a case where an operator enters and leaves the field by walking.

  The entrance / exit management system includes a mobile terminal and a server. Then, the mobile terminal measures the position sensor, the acceleration in the vertical direction, stores the measurement result in the storage device, and detects periodic vibration from the measurement result stored in the storage device. Using the result, an analysis unit that calculates the vibration period and amplitude value at the present time, and the current amplitude value relative to the amplitude value at the time when the previous position data was acquired when the current vibration period is the vibration period when the work vehicle is boarded If the rate of change of the amplitude value is out of the predetermined range, the rate of change of the amplitude value is determined to be out of the predetermined range. It has a control part which makes a position sensor acquire position data, and a transmission part which transmits position data acquired by a position sensor to a server. The server also includes a field database that stores area information of each field, an entry / exit history database that stores records including field information including information indicating that the field is identifier or outside the field, and an entry time and an exit time. And if the position data is received from the mobile terminal, it is determined from the received position data and the area information stored in the field database whether the position of the mobile terminal is in any field or outside the field. If the field is within the field, the field determination unit that identifies the identifier of the specific field including the position of the mobile terminal, and the identifier of the specific field that is the processing result of the field determination unit or that is outside the field When the first field information including the information is different from the second field information which is the field information included in the latest record stored in the entry / exit history database, And it sets the latest record standing time as exit time, and a entrance and exit management unit to be added to the entrance and exit history database a new record containing and current time comprises a first field information as admission time.

  This position data acquisition control method is a position data acquisition control method executed by a mobile terminal, and measures acceleration in the vertical direction and stores it in the storage device (FIG. 17: S1001), and is stored in the storage device. If periodic vibration is detected from the measured results, the step of calculating the current vibration cycle and amplitude value using the measurement results (FIG. 17: S1003), and the current vibration cycle is the vibration when the work vehicle is boarded In the case of a period, a step (FIG. 17: S1005) of calculating a ratio of the current amplitude value to the amplitude value at the time when the previous position data was acquired as a rate of change of the amplitude value, and the rate of change of the amplitude value from a predetermined range If it is determined whether or not the deviation rate is out of the predetermined range (FIG. 17: S1007) (FIG. 17: Yes in S1007) And a S1009): g), the step of acquiring the position data in the position sensor of the mobile terminal (FIG. 17.

  A program for causing a computer to perform the processing described above can be created, such as a flexible disk, a CD-ROM, a magneto-optical disk, a semiconductor memory (for example, ROM), a hard disk, etc. Stored in a computer-readable storage medium or storage device. Note that data being processed is temporarily stored in a storage device such as a RAM.

  The following supplementary notes are further disclosed with respect to the embodiments including the above examples.

(Appendix 1)
A position sensor;
An acceleration sensor that measures vertical acceleration and stores the measurement result in a storage device;
When periodic vibration is detected from the measurement result stored in the storage device, an analysis unit that calculates a vibration period and an amplitude value at the present time using the measurement result;
When the current vibration cycle is a vibration cycle when the work vehicle is boarded, a change rate calculation unit that calculates a ratio of the current amplitude value to the amplitude value at the time when the previous position data was acquired as a change rate of the amplitude value;
Determining whether or not the rate of change of the amplitude value is out of a predetermined range, and when the rate of change of the amplitude value is out of the predetermined range, a control unit that causes the position sensor to acquire position data;
Mobile terminal having.

(Appendix 2)
A field database for storing area information of each field;
Field information including information representing the field identifier or information indicating that the field is outside, an entry / exit history database storing a record including an entry time, and an exit time;
From the position data acquired this time by the position sensor and the area information stored in the field database, it is determined whether the position of the mobile terminal is in any field or outside the field, and any field A field determination unit that identifies an identifier of a specific field that includes the position of the mobile terminal,
The field including the first field information including the identifier of the specific field that is the processing result of the field determination unit or information indicating that the field is out of the field included in the latest record stored in the entry / exit history database If it is different from the second field information that is information, a new time that includes the first field information and the current time as the entry time is set in the latest record as the exit time. An entrance / exit management unit for adding records to the entrance / exit history database;
The mobile terminal according to appendix 1, further comprising:

(Appendix 3)
The control unit is
When the field information included in the latest record stored in the entry / exit history database includes information indicating that the field is out of the field, the rate of change of the amplitude value falls below the lower limit value of the predetermined range. If it is below, let the position sensor acquire the position data,
If the field information included in the latest record stored in the entry / exit history database includes any field identifier, whether the rate of change of the amplitude value exceeds the upper limit of the predetermined range The portable terminal according to Supplementary Note 2, wherein the position data is acquired by the position sensor if it is determined and exceeded.

(Appendix 4)
The control unit is
When the vibration period and amplitude value at the present time are the vibration period and amplitude value at the time of walking, it is determined whether or not a certain time has elapsed since the previous position data was acquired, and if the certain time has elapsed, the position sensor The mobile terminal according to any one of supplementary notes 1 to 3, wherein the position data is acquired.

(Appendix 5)
A mobile device,
Server,
Have
The portable terminal is
A position sensor;
An acceleration sensor that measures vertical acceleration and stores the measurement result in a storage device;
When periodic vibration is detected from the measurement result stored in the storage device, an analysis unit that calculates a vibration period and an amplitude value at the present time using the measurement result;
When the current vibration cycle is a vibration cycle when the work vehicle is boarded, a change rate calculation unit that calculates a ratio of the current amplitude value to the amplitude value at the time when the previous position data was acquired as a change rate of the amplitude value;
Determining whether or not the rate of change of the amplitude value is out of a predetermined range, and when the rate of change of the amplitude value is out of the predetermined range, a control unit that causes the position sensor to acquire position data;
A transmission unit that transmits the position data acquired by the position sensor to the server;
Have
The server
A field database for storing area information of each field;
Field information including information representing the field identifier or information indicating that the field is outside, an entry / exit history database storing a record including an entry time, and an exit time;
When the position data is received from the mobile terminal, it is determined from the received position data and the region information stored in the field database whether the position of the mobile terminal is in any field or outside the field. And an agricultural field determination unit that identifies an identifier of a specific agricultural field that includes the position of the mobile terminal when in any of the agricultural fields,
The field including the first field information including the identifier of the specific field that is the processing result of the field determination unit or information indicating that the field is out of the field included in the latest record stored in the entry / exit history database If it is different from the second field information that is information, a new time that includes the first field information and the current time as the entry time is set in the latest record as the exit time. An entrance / exit management unit for adding records to the entrance / exit history database;
Entrance / exit management system.

(Appendix 6)
A position data acquisition control method executed by a mobile terminal,
Measuring acceleration in the vertical direction and storing the measurement result in a storage device;
When detecting periodic vibration from the measurement result stored in the storage device, using the measurement result, calculating a vibration period and an amplitude value at the present time;
When the current vibration period is a vibration period when the work vehicle is boarded, calculating a ratio of the current amplitude value to the amplitude value at the time when the previous position data was acquired as a change rate of the amplitude value;
Determining whether the change rate of the amplitude value is out of a predetermined range, and if the change rate of the amplitude value is out of the predetermined range, causing the position sensor of the mobile terminal to acquire position data; ,
A position data acquisition control method including:

(Appendix 7)
A program for causing a mobile terminal to execute processing,
When periodic vibration is detected from the measurement result stored in the storage device that stores the measurement result obtained from the acceleration sensor of the mobile terminal that measures the acceleration in the vertical direction, using the measurement result, Calculating a vibration period and an amplitude value at the current time;
When the current vibration period is a vibration period when the work vehicle is boarded, calculating a ratio of the current amplitude value to the amplitude value at the time when the previous position data was acquired as a change rate of the amplitude value;
Determining whether the change rate of the amplitude value is out of a predetermined range, and if the change rate of the amplitude value is out of the predetermined range, causing the position sensor of the mobile terminal to acquire position data; ,
A program for running

DESCRIPTION OF SYMBOLS 1 Network 3 Server 100,200 Portable terminal 101 Acceleration sensor 103 Acceleration data storage part 105 Acceleration data analysis part 107 Analysis result storage part 109 Control part 111 Change rate calculation part 113 Amplitude value storage part 115 GPS sensor 117 Field determination part 119 Field DB
121 Entry / Exit Management Department 123 Entry / Exit History DB
125 output unit 201 transmission unit 301 reception unit

Claims (7)

A position sensor;
An acceleration sensor that measures vertical acceleration and stores the measurement result in a storage device;
When periodic vibration is detected from the measurement result stored in the storage device, an analysis unit that calculates a vibration period and an amplitude value at the present time using the measurement result;
When the current vibration cycle is a vibration cycle when the work vehicle is boarded, a change rate calculation unit that calculates a ratio of the current amplitude value to the amplitude value at the time when the previous position data was acquired as a change rate of the amplitude value;
Determining whether or not the rate of change of the amplitude value is out of a predetermined range, and when the rate of change of the amplitude value is out of the predetermined range, a control unit that causes the position sensor to acquire position data;
Mobile terminal having. A field database for storing area information of each field;
Field information including information representing the field identifier or information indicating that the field is outside, an entry / exit history database storing a record including an entry time, and an exit time;
From the position data acquired this time by the position sensor and the area information stored in the field database, it is determined whether the position of the mobile terminal is in any field or outside the field, and any field A field determination unit that identifies an identifier of a specific field that includes the position of the mobile terminal,
The field including the first field information including the identifier of the specific field that is the processing result of the field determination unit or information indicating that the field is out of the field included in the latest record stored in the entry / exit history database If it is different from the second field information that is information, a new time that includes the first field information and the current time as the entry time is set in the latest record as the exit time. An entrance / exit management unit for adding records to the entrance / exit history database;
The mobile terminal according to claim 1, further comprising: The control unit is
When the field information included in the latest record stored in the entry / exit history database includes information indicating that the field is out of the field, the rate of change of the amplitude value falls below the lower limit value of the predetermined range. If it is below, let the position sensor acquire the position data,
If the field information included in the latest record stored in the entry / exit history database includes any field identifier, whether the rate of change of the amplitude value exceeds the upper limit of the predetermined range The mobile terminal according to claim 2, wherein the position data is acquired by the position sensor if it is determined and exceeded. The control unit is
When the vibration period and amplitude value at the present time are the vibration period and amplitude value at the time of walking, it is determined whether or not a certain time has elapsed since the previous position data was acquired, and if the certain time has elapsed, the position sensor The mobile terminal according to claim 1, wherein the position data is acquired. A mobile device,
Server,
Have
The portable terminal is
A position sensor;
An acceleration sensor that measures vertical acceleration and stores the measurement result in a storage device;
When periodic vibration is detected from the measurement result stored in the storage device, an analysis unit that calculates a vibration period and an amplitude value at the present time using the measurement result;
When the current vibration cycle is a vibration cycle when the work vehicle is boarded, a change rate calculation unit that calculates a ratio of the current amplitude value to the amplitude value at the time when the previous position data was acquired as a change rate of the amplitude value;
Determining whether or not the rate of change of the amplitude value is out of a predetermined range, and when the rate of change of the amplitude value is out of the predetermined range, a control unit that causes the position sensor to acquire position data;
A transmission unit that transmits the position data acquired by the position sensor to the server;
Have
The server
A field database for storing area information of each field;
Field information including information representing the field identifier or information indicating that the field is outside, an entry / exit history database storing a record including an entry time, and an exit time;
When the position data is received from the mobile terminal, it is determined from the received position data and the region information stored in the field database whether the position of the mobile terminal is in any field or outside the field. And an agricultural field determination unit that identifies an identifier of a specific agricultural field that includes the position of the mobile terminal when in any of the agricultural fields,
The field including the first field information including the identifier of the specific field that is the processing result of the field determination unit or information indicating that the field is out of the field included in the latest record stored in the entry / exit history database If it is different from the second field information that is information, a new time that includes the first field information and the current time as the entry time is set in the latest record as the exit time. An entrance / exit management unit for adding records to the entrance / exit history database;
Entrance / exit management system. A position data acquisition control method executed by a mobile terminal,
Measuring acceleration in the vertical direction and storing the measurement result in a storage device;
When detecting periodic vibration from the measurement result stored in the storage device, using the measurement result, calculating a vibration period and an amplitude value at the present time;
When the current vibration period is a vibration period when the work vehicle is boarded, calculating a ratio of the current amplitude value to the amplitude value at the time when the previous position data was acquired as a change rate of the amplitude value;
Determining whether the change rate of the amplitude value is out of a predetermined range, and if the change rate of the amplitude value is out of the predetermined range, causing the position sensor of the mobile terminal to acquire position data; ,
A position data acquisition control method including: A program for causing a mobile terminal to execute processing,
When periodic vibration is detected from the measurement result stored in the storage device that stores the measurement result obtained from the acceleration sensor of the mobile terminal that measures the acceleration in the vertical direction, using the measurement result, Calculating a vibration period and an amplitude value at the current time;
When the current vibration period is a vibration period when the work vehicle is boarded, calculating a ratio of the current amplitude value to the amplitude value at the time when the previous position data was acquired as a change rate of the amplitude value;
Determining whether the change rate of the amplitude value is out of a predetermined range, and if the change rate of the amplitude value is out of the predetermined range, causing the position sensor of the mobile terminal to acquire position data; ,
A program for running

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