JP6498061B2 - Altimeter - Google Patents

Description

  The present invention relates to an altimeter.

  Conventionally, an altimeter that measures atmospheric pressure (atmospheric pressure) and detects the altitude at that time based on the measured atmospheric pressure, and an electronic device that performs the function have been developed. These electronic devices may be used in outdoor exercises performed in mountainous areas where undulations and slopes are remarkable, such as mountain climbing and hiking. Some of these electronic devices are reduced in size and weight and display an ascending speed or a descending speed based on a detected altitude. In the following description, the ascending speed and the descending speed are collectively referred to as “elevating speed” (also referred to as elevating speed or elevating speed).

  For example, Patent Document 1 discloses a pressure sensor, a vertical distance calculating unit that calculates a vertical distance from a first point to a second point based on a pressure detected by the pressure sensor, and a second distance from the first point. Measuring means for measuring the time to reach the point, and arithmetic means for calculating an average ascending or descending speed from the vertical distance calculated by the vertical distance calculating means and the measuring time of the measuring means. An electronic timepiece with a pressure sensor is described.

  Further, for example, in Patent Document 2, altitude measuring means for intermittently measuring altitude, switch means for instructing start and end of measurement, and measurement start altitude when measurement is started by an instruction by this switch means. Measurement start altitude storage means for storing, measurement end altitude storage means for storing the measurement end altitude when the measurement is terminated by an instruction from the switch means, and the current measurement every time a new altitude is detected by the altitude measurement means Altitude difference detection means for detecting whether the difference between the measured altitude and the previously measured altitude is greater than or equal to a predetermined value, and when the altitude difference detection means detects that the difference is greater than or equal to the predetermined value, Time storage means for obtaining the altitude change time by adding the time until the current altitude measurement, and average altitude calculation means for obtaining the average speed from the measurement start altitude, the measurement end altitude and the altitude change time are provided. Electronic altimeter, wherein Rukoto is described.

JP 63-121778 A Japanese Patent Laid-Open No. 5-280977

  The ascending / descending speed calculated by the electronic timepiece with pressure sensor described in Patent Document 1 is a value obtained by dividing the current altitude (relative altitude) based on the altitude at the start of measurement by the elapsed time up to the present time. Therefore, the calculated ascent / descent speed alone may not reflect the ascending or descending state from the measurement start time to the present (hereinafter referred to as “elevating state”).

In addition, the electronic altimeter described in Patent Document 2 is based on the current altitude measurement from the previous altitude measurement when the difference between the altitude measured this time and the altitude measured last time is greater than or equal to a predetermined value each time a new altitude is detected. The average speed is obtained from the altitude change time which adds the time until altitude measurement. When the altitude detected by such an electronic altimeter includes a measurement error, it is conceivable to increase the predetermined value, for example, in order to reduce the influence of the measurement error. However, if the predetermined value is increased, the average speed may not be calculated correctly for, for example, gentle ups and downs.
As described above, the movement state in the vertical direction may not be accurately determined.

  It is an object of some aspects of the present invention to provide an altimeter that can accurately determine the movement state in the vertical direction.

  Another object of another aspect of the present invention is to provide an altimeter that can achieve the effects described in the embodiments described later.

(1) In order to solve the above-described problem, an aspect of the present invention includes an altitude measurement unit that outputs a measured altitude, a first measurement altitude that is the measurement altitude at a first time point, and the first A measurement altitude storage unit that stores a second measurement altitude that is the measurement altitude at a second time before the time and a third measurement altitude that is the measurement altitude at a third time before the second time; A determination altitude difference storage unit that stores a predetermined first determination altitude difference and a predetermined second determination altitude difference that is smaller than the first determination altitude difference; the first measurement altitude and the second measurement altitude A first measured altitude difference that is a difference between the first measured altitude and the first determined altitude difference, and a second measured altitude difference that is a difference between the first measured altitude and the third measured altitude. Compare the magnitude relationship with the second judgment altitude difference and move the device in the vertical direction A altimeter, characterized in that it comprises a determining unit for status, the.

(2) Moreover, 1 aspect of this invention is an altimeter as described in said (1), Comprising: The said 1st determination altitude difference is a value according to the time interval of the said 1st time point and the said 2nd time point. The second determination altitude difference is a value corresponding to a time interval between the first time point and the third time point.

(3) One embodiment of the present invention is the altimeter according to (1) or (2) above, wherein the second determination altitude difference is a time interval between the second time point and the third time point. Only a value corresponding to the difference is smaller than the first determination altitude difference.

(4) Moreover, 1 aspect of this invention is an altimeter in any one of said (1) to (3), Comprising: The said determination part WHEREIN: The said 1st measurement height difference is more than the said 1st determination height difference. Alternatively, when the second measured altitude difference is equal to or greater than the second determination altitude difference, it is determined that the own apparatus is in the ascending / descending state.

(5) Moreover, 1 aspect of this invention is an altimeter in any one of said (1) to (4), Comprising: The said determination altitude difference memory | storage part is the 1st determination corresponding to each of the said movement state. An altitude difference and a second determination altitude difference are stored, and the determination unit determines the first determination altitude difference and the second determination altitude difference corresponding to the previous determination result in two successive determinations of the movement state. Based on the above, the next movement state determination is performed.

(6) According to another aspect of the present invention, an altitude measuring unit that measures altitude, a predetermined first threshold altitude range, and a predetermined second threshold altitude range narrower than the first threshold altitude range are set. A setting unit, whether or not a first altitude measured at a first time point is included in the first threshold altitude range, and a second altitude measured at a second time point before the first time point is the second threshold value. And a determination unit that determines a movement state of the device in the vertical direction based on whether or not the device is included in the altitude range.

(7) Moreover, 1 aspect of this invention is an altimeter as described in said (6), Comprising: The said setting part is the both end points of the said 1st threshold height range, The both ends of the said 2nd threshold height range, The first threshold altitude range and the second threshold altitude range are set so that the shape of a rectangle with vertices at the top is a trapezoid whose lower side is a line connecting both ends of the first threshold altitude range It is characterized by doing.

(8) Moreover, 1 aspect of this invention is an altimeter as described in said (6) or (7), Comprising: The said setting part is compared with each of the altitude measured in three or more different time points. Each of the threshold altitude ranges is set such that at least one of each of the vertical upper end points and each of the vertical lower end points of each of the threshold altitude ranges is included in one curve. And

  According to the present invention, the moving state in the vertical direction can be accurately determined.

It is a front view which shows the external appearance structure of the electronic device in the 1st Embodiment of this invention. It is a schematic block diagram which shows the structure of the electronic device which concerns on the same embodiment. It is a figure showing an example of a detection window concerning the embodiment. It is a figure which shows the determination result of the altitude change state by the detection window which concerns on the embodiment, and the example of an actual altitude change state. It is a figure which shows the determination result of the altitude change state by the detection window of a 1st comparative example, and the example of an actual altitude change state. It is a figure which shows the determination result of the altitude change state by the detection window of a 2nd comparative example, and the example of an actual altitude change state. It is a figure which shows the example of a setting of the moving average area by the electronic device which concerns on the same embodiment. It is a figure which shows an example of the information which the display part of the electronic device which concerns on the same embodiment displays. It is a flowchart which shows an example of the flow of the data processing which concerns on the same embodiment. It is FIG. 2 which shows an example of the detection window which concerns on the same embodiment. It is a figure which shows the determination result of the altitude change state by the detection window which concerns on the 2nd Embodiment of this invention, and the example of an actual altitude change state. It is a figure which shows the 1st example of the detection window which concerns on the modification of this invention. It is a figure which shows the 2nd example of the detection window which concerns on the modification of this invention. It is a figure which shows the 3rd example of the detection window which concerns on the modification of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First embodiment]
A first embodiment of the present invention will be described. In the drawings, the same parts are denoted by the same reference numerals.
FIG. 1 is a front view showing an external configuration of an electronic device 10 according to the present embodiment.
The electronic device 10 is, for example, an electronic timepiece with an altitude measurement function that measures altitude. The electronic device 10 measures the current time and altitude, and calculates the ascending / descending speed based on the measured altitude.

The electronic device 10 includes an operation input unit 104 and a display unit 105.
The operation input unit 104 includes, for example, a plurality (two in this embodiment) of key input means (operation input units) 104A and 104B. Each of the key input means 104A and 104B has a button, receives an operation input, and outputs an operation signal corresponding to the received operation input to the control unit 101.
For example, the key input unit 104A receives an operation of switching the operation mode when a button is pressed. There are two types of operation modes, for example, “normal mode” for displaying the measured current time, altitude and elevation speed, and “altitude log mode” for recording altitude information (for example, altitude and elevation speed). is there. The electronic device 10 operates in an operation mode switched according to an operation.

  When the electronic device 10 is operating in the altitude log mode, the key input unit 104B accepts an operation for switching information to be displayed on the display unit 105 when a button is pressed, for example. The displayed information includes, for example, “start display”, “maximum altitude display”, and “current altitude display”. The start display is altitude information when recording is started. The maximum altitude display is altitude information related to the maximum altitude (maximum altitude) among the altitudes indicated by the recorded altitude information. The current altitude display is altitude information acquired at the time when operating in the altitude log mode.

The display unit 105 displays the acquired information. The display unit 105 is, for example, a liquid crystal display, a segment display, or the like.
The display unit 105 includes, for example, an altitude display unit 105a, a time display unit 105b, and an ascending / descending speed display unit 105c. In the example shown in FIG. 8A, the ascending / descending speed display unit 105c that displays the ascending / descending speed, the altitude display unit 105a that displays the altitude, and the time display unit 105b that displays the time are displayed in this order.

FIG. 2 is a block diagram illustrating a configuration of the electronic device 10 according to the present embodiment.
The electronic device 10 includes a control unit 101, an oscillation circuit 102, a frequency dividing circuit 103, an operation input unit 104, a display unit 105, a battery 106, an atmospheric pressure measurement unit 107, an altitude measurement unit 108, and a RAM (Random Access Memory). 110 and ROM (Read Only Memory) 111.

The control unit 101 controls each unit included in the electronic device 10. The control unit 101 is, for example, a CPU (Central Processing Unit).
Considering from a functional aspect, the control unit 101 includes an altitude change determination unit 1011 and an elevation speed calculation unit 1012.

The altitude change determination unit 1011 determines the altitude change state based on the altitude signal input from the altitude measurement unit 108 within a predetermined first time interval (for example, 5 minutes) until now.
The altitude change state is, for example, a movement state classified based on a movement amount in the vertical direction, and is an example of a movement state in the vertical direction. The altitude change state includes, for example, an “elevating state” and a “non-elevating state”. Further, the up / down state includes, for example, an “up state” and a “down state”. The ascending state is a state where the altitude increases with time. The rising state may appear, for example, when a user who possesses the electronic device 10 is walking on a mountain path having an upward slope. The descending state may appear, for example, when a user who possesses the electronic device 10 is walking on a mountain trail having a downward slope. The non-lifting state is a state in which no significant change in altitude appears, that is, a state in which neither an ascending state nor a descending state is present. The non-lifting state may appear, for example, when the user who possesses the electronic device 10 is walking on a flat ground or is resting. The altitude change state may be classified into two patterns, for example, an up-and-down state and a non-up-and-down state. Good. That is, the altitude change state is not limited to the above-described three patterns, and may be any plurality of patterns. Specifically, for example, the rising state may be further classified into “suddenly rising”, “normally rising”, “slowly rising”, etc., and the falling state is “suddenly decreasing”, “normally decreasing”, It may be further classified into “slow descent” or the like. An example of the process for determining the altitude change state will be described later.

The ascending / descending speed calculating unit 1012 calculates the moving average value of the ascending / descending speed based on the altitude signal input from the altitude measuring unit 108 within the second time interval up to now. The second time interval is a value larger than the first time interval. The second time interval may be variable. If the second time interval is variable, the second time interval is temporarily set to the first time if there is a possibility that the second time interval is set to be larger than the first time interval. It may be equal to the time interval or may be smaller than the first time interval.
For example, when the altitude change state changes, the ascending / descending speed calculation unit 1012 reduces the second time interval to the first time interval, and then sets a predetermined third time interval (the maximum of the second time interval). The second time interval is expanded with the same degree of progress as time elapses until the value is reached. An example of processing for calculating the ascending / descending speed will be described later.

  The control unit 101 measures the current time based on the measurement signal input from the frequency dividing circuit 103. The control unit 101 generates altitude information including the calculated moving average value of the lifting speed and the altitude sampled by the altitude change determination unit 1011. When operating in the normal mode or when operating in the altitude log mode and no operation signal is input from the key input means 104B, the control unit 101 displays time information indicating the current time measured and generated altitude information. Is displayed on the display unit 105, and the current time, altitude, and ascending / descending speed are displayed on the display unit 105.

  The control unit 101 performs processing according to the operation signal input from the operation input unit 104. For example, when an operation signal (altitude log mode) is input from the key input unit 104A while operating in the normal mode, the control unit 101 switches the operation mode from the normal mode to the altitude log mode. Start operation with. In the altitude log mode, the control unit 101 records altitude information as a log file in the RAM 110 at predetermined time intervals. When operating in the altitude log mode, when an operation signal (normal mode) is input from the key input means 104A, the control unit 101 switches the operation mode from the altitude log mode to the normal mode, and records altitude information. To stop.

When the control unit 101 operates in the altitude log mode and displays the currently acquired altitude information, when an operation signal (start time display) is input from the key input unit 104B, the control unit 101 starts recording ( The altitude information at the time of start) is read from the RAM 110. The control unit 101 outputs the read altitude information to the display unit 105 for display.
When the control unit 101 operates in the altitude log mode and displays altitude information at the start, when an operation signal (maximum altitude display) is input from the key input unit 104B, the altitude information related to the maximum altitude is stored in the RAM 110. Read from. The control unit 101 outputs the read altitude information to the display unit 105 for display.
When the control unit 101 operates in the altitude log mode and displays altitude information related to the maximum altitude, when an operation signal (current altitude display) is input from the key input unit 104B, the control unit 101 Is output to the display unit 105 and displayed.

The oscillation circuit 102 generates an oscillation signal having a predetermined frequency (oscillation frequency, for example, 32768 Hz), and outputs the generated oscillation signal to the frequency dividing circuit 103.
The frequency dividing circuit 103 divides the oscillation frequency of the oscillation signal input from the oscillation circuit 102 to generate a measurement signal that is a reference for measurement at a predetermined frequency (clock frequency, for example, 100 Hz).
The battery 106 supplies power for operation to each unit constituting the electronic device 10.

The atmospheric pressure measurement unit 107 measures the atmospheric pressure and outputs an atmospheric pressure signal indicating the measured atmospheric pressure to the altitude measurement unit 108. The atmospheric pressure measurement unit 107 is, for example, an atmospheric pressure sensor.
The altitude measurement unit 108 measures the altitude based on the atmospheric pressure signal input from the atmospheric pressure measurement unit 107 and outputs an altitude signal indicating the measured altitude to the control unit 101. When measuring the altitude, the altitude measuring unit 108 converts the atmospheric pressure P indicated by the input atmospheric pressure signal into the altitude h using, for example, Equation (1).

h = {(P0 / P) (1 / 5.257) -1}. (T + 273.15) /0.0065 (1)

In the formula (1), P0 indicates a pressure 1013 hPa at a predetermined altitude, for example, an altitude 0 m (sea level). T indicates temperature (° C).
The atmospheric pressure measurement unit 107 and the altitude measurement unit 108 constitute an altimeter that measures altitude.

The RAM 110 stores data used for operations in each unit of the electronic device 10 and data generated in each unit. The RAM 110 stores, for example, altitude information as a log file.
The ROM 111 stores an operation program executed by the control unit 101 in advance. The operation program is read when the control unit 101 is activated, and the control unit 101 executes processing specified by the read operation program. The ROM 111 and RAM 110 store various threshold data.

Next, an example of processing in which the altitude change determination unit 1011 determines the altitude change state will be described.
The altitude change determination unit 1011 samples the altitude indicated by the altitude signal input from the altitude measurement unit 108 every predetermined time interval (sampling interval, for example, 1 minute) ΔT. In the following description, the altitude sampled at that time is called “current altitude”, and the altitude sampled before the current altitude is called “past altitude”. Each sampled time may be referred to as a “sampling time”.

The altitude change determination unit 1011 determines the altitude change state based on the altitude sampled in the section from the past time t−ΔT1 to the current time t by a first time interval ΔT1 that is predetermined from the current time t. A section from this time t-ΔT1 to the current time t is referred to as a “determination section”.
Here, the altitude change determination unit 1011 compares the distribution of altitude sampled within the determination section with an altitude range (hereinafter referred to as a “threshold altitude range”) determined based on the current altitude h. The altitude change state can be determined. Hereinafter, the lower limit value of the threshold altitude range is referred to as a “state determination lower limit value”. Further, the upper limit value of the threshold altitude range is referred to as a “state determination upper limit value”. The altitude change determination unit 1011 calculates the difference between the current altitude h and the altitude sampled within the determination interval, and the difference between the difference and a predetermined altitude difference (hereinafter referred to as “determination altitude difference”). Can be compared to determine the altitude change state. The determination of the altitude change state using the threshold altitude range and the determination of the altitude change state using the determination altitude difference are substantially the same except for the processing order. Here, as an example, the determination of the altitude change state using the threshold altitude range will be described.
The altitude change determination unit 1011 determines, for example, the current time when the altitude sampled in the determination interval is within the range between the state determination lower limit value and the state determination upper limit value, that is, within the threshold altitude range. It is determined that the altitude change state of t is a non-lifting state.

For example, when at least one of the altitudes sampled in the determination section is lower than the state determination lower limit value, the altitude change determination unit 1011 determines that the altitude change state at the current time t is an ascending state.
For example, if at least one of the altitudes sampled in the determination section is higher than the state determination upper limit value, the altitude change determination unit 1011 determines that the altitude change state at the current time t is a descending state.

  Note that the altitude sampled in the determination section may include both an altitude lower than the state determination lower limit and an altitude higher than the state determination upper limit. In that case, for example, the altitude change determination unit 1011 selects the current time t based on the altitude at the time t ′ closest to the current time t among the altitude lower than the state determination lower limit and the altitude higher than the state determination upper limit. The altitude change state may be determined. That is, when the altitude at time t ′ is lower than the state determination lower limit value, the altitude change determination unit 1011 determines that the altitude change state at the current time t is in the rising state. When the altitude at time t ′ is higher than the state determination upper limit value, the altitude change determination unit 1011 determines that the altitude change state at the current time t is in a descending state.

  In addition, the altitude change determination unit 1011 compares the number of samples at an altitude lower than the state determination lower limit value included in the altitude sampled within the determination interval with the number of samples at an altitude higher than the state determination upper limit value, You may determine the altitude change state of the present time t. That is, when the number of samples at an altitude lower than the state determination lower limit is greater than the number of samples at an altitude higher than the state determination upper limit, the altitude change determination unit 1011 determines that the state is an ascending state. When the number of samples at an altitude lower than the state determination lower limit value is equal to the number of samples at an altitude higher than the state determination upper limit value, the altitude change determination unit 1011 determines that the state is the non-lifting state. When the number of samples at an altitude lower than the state determination lower limit value is smaller than the number of samples at an altitude higher than the state determination upper limit value, the altitude change determination unit 1011 determines that the state is in a descending state.

In addition, the altitude change determination unit 1011 determines that the altitude sampled within the determination interval is in an elevated state when the average value of the altitude sampled is lower than the state determination lower limit, and the average altitude sampled within the determination interval indicates the state. If it is higher than the determination upper limit value, it may be determined as a descending state, and otherwise it may be determined as a non-lifting state.
In this way, by comparing the distribution of altitude sampled within the judgment section with a predetermined altitude range centered on the current altitude, it is less susceptible to measurement errors and noise. The change state can be determined stably.
The altitude change determination unit 1011 outputs altitude change state information indicating the determined altitude change state and the sampled altitude to the elevation speed calculation unit 1012.

  The altitude change state information may be represented by a value corresponding to each altitude change state. For example, the ascending state, the descending state, and the non-elevating state may be represented by values such as “+1”, “−1”, and “0”, respectively.

  As described above, the altitude change determination unit 1011 determines the altitude change state based on whether or not the altitude sampled at each sampling time included in the determination section is included in the threshold altitude range at each time. Hereinafter, an area on the altitude axis-time axis plane used for determining the altitude change state, that is, an area delimited by the determination interval and the threshold altitude range is referred to as a “detection window”. That is, the detection window is an area where the time is from time t−ΔT1 to the current time t and the altitude is from the state determination lower limit value to the state determination upper limit value.

Here, the shape of the detection window according to the present embodiment will be described.
FIG. 3 is a diagram illustrating an example of the detection window W1 according to the present embodiment.
In the graph shown in FIG. 3, the horizontal axis indicates time, and the vertical axis indicates altitude.
The detection window W1 is determined based on the altitude h (t) at the measurement reference time point t. Here, the measurement reference time t is a reference time for determining the altitude change state. In the present embodiment, the electronic device 10 determines the altitude change state in real time whenever the altitude is sampled. That is, in the present embodiment, the measurement reference time t is the latest sampling time and is the above-described current time t.
The detection window W1 includes a state determination upper limit value P1 and a state determination lower limit value P2 at the measurement reference time point t.
And a rectangular shape having apexes of the state determination upper limit value P3 and the state determination lower limit value P4 at a time point (hereinafter referred to as “past reference time point”) t−ΔT1 at both ends of the determination interval. It is an area.

The state determination upper limit P1 at the measurement reference time t is a value that is higher by a predetermined determination height difference Δh (t) than the altitude (hereinafter referred to as “reference height”) h (t) measured at the measurement reference time t. . The state determination lower limit value P2 at the measurement reference time point t is a value that is lower than the reference height h (t) by a predetermined determination height difference Δh. That is, the threshold altitude range TA (t) at the measurement reference time point t is an altitude range from (h (t) −Δh (t)) to (h (t) + h (t)).
The state determination upper limit P3 at the past reference time point t−ΔT1 is a value that is higher than the reference height h (t) by a predetermined determination height difference Δh (t−ΔT1). The state determination lower limit value P4 at the past reference time point t−ΔT1 is a value lower than the reference height h (t) by a predetermined determination height difference Δh (t−ΔT1). That is, the threshold altitude range TA (t−ΔT1) at the past reference time point t−ΔT1 is an altitude range of (h (t) −Δh (t−ΔT1)) to (Δh (t) + h (t−ΔT1)). is there.
Here, in the present embodiment, the determination altitude difference Δh (t−ΔT1) is set to a smaller value than the determination altitude difference Δh (t). Accordingly, the shape of the detection window W1 is an isosceles trapezoid with the line segment connecting the points P1 and P2 as the bottom.

  A line segment (hereinafter, referred to as “upper threshold line”) UT connecting the points P1 and P3 represents a set of upper limit values of the threshold altitude range in the determination section of the detection window W1. In other words, the upper limit threshold line UT is a line segment connecting points representing the state determination upper limit values at the respective sampling times included in the determination section of the detection window W1 in the order of the corresponding sampling times. In the present embodiment, since the determination altitude difference Δh (t−ΔT1) is set to a value smaller than the determination altitude difference Δh (t), the upper threshold line UT is a line segment having a positive slope. is there.

A line segment connecting the points P2 and P4 (hereinafter referred to as a “lower threshold line”) LT represents a set of lower limit values of the threshold altitude range in the determination section of the detection window W1. In other words, the lower threshold line LT is a line segment connecting points representing the state determination lower limit values at the respective sampling times included in the determination section of the detection window W1 in the order of the corresponding sampling times. In the present embodiment, the determination altitude difference Δh (t−ΔT1) is set to a smaller value than the determination altitude difference Δh (t), so the lower limit threshold line LT is a line segment having a negative slope. is there.
Thus, it can be said that the threshold altitude range at each time included in the determination section is determined for each time, or can be said to be determined by the threshold altitude ranges at both ends of the determination section.

Next, the relationship between the shape of the detection window and the determination of the altitude change state will be described.
First, determination of the altitude change state by the isosceles trapezoidal detection window W1 will be described.
FIG. 4 is a diagram showing the determination result of the altitude change state by the isosceles trapezoidal detection window W1 and an example of the actual altitude change state.
In the graph shown in FIG. 4, the horizontal axis represents time and the vertical axis represents altitude.
The graph shown in FIG. 4 shows the sampled altitude at each sampling time.
In FIG. 4, at the bottom of the graph, the actual altitude change state of the user at each sampling time (“user altitude change state” in FIG. 4) and the determination result of the altitude change state by the electronic device 10 at each sampling time ( 4 shows “determination result”.
In the example shown in FIG. 4, the length of the determination section of the detection window W1, that is, the first time interval is set to 5 times the sampling interval. That is, the threshold altitude range is determined for altitudes sampled up to 5 points before the measurement reference time.

  As can be confirmed from the change in altitude shown in the graph of FIG. 4, the user is in the non-lifting state (“0”) from the sampling time T1 to the sampling time T2. Further, the user is in the rising state (“+1”) from the sampling time T2 to the sampling time T7. Further, the user is in a descending state (“−1”) from the sampling time T7 to the sampling time T11. Further, the user is in a non-lifting state from the sampling time T11 to the sampling time T16.

  On the other hand, when the isosceles trapezoidal detection window W1 is used, it is determined that the user is in a non-lifting state from the sampling time T1 to the sampling time T3. At this time, between the sampling time T1 and the sampling time immediately before the sampling time T3, all the altitudes sampled in the determination section of the detection window W1 are within the threshold altitude range.

  Further, it is determined that the user is in the rising state from the sampling time T3 to the sampling time T9. At this time, between the sampling time T3 and the sampling time immediately before the sampling time T9, at least one of the altitudes sampled in the determination section of the detection window W1 is smaller than the state determination lower limit value. It is a small value.

Further, it is determined that the user is in the descending state from the sampling time T9 to the sampling time T13. At this time, between the sampling time T9 and the sampling time immediately before the sampling time T13, at least one of the altitudes sampled in the determination section of the detection window W1 is compared with the state determination upper limit value. It is a large value.
Further, it is determined that the user is in the non-lifting state from the sampling time T13 to the sampling time T16.

  When the actual altitude change state is compared with the determination result, it can be confirmed that a determination result matching the actual altitude change state is obtained following the transition of the actual altitude change state. Specifically, at the sampling time T2, the user's altitude change state transitions from the non-lifting state to the rising state. Then, at the sampling time T3 two times after the sampling time T2, the determination result transitions from the non-lifting state to the rising state. Similarly, at the sampling time T7, the user's altitude change state transitions from the rising state to the falling state, and at the sampling time T9 two times after the sampling time T7, the determination result is changed from the non-lifting state to the rising state. There is a transition. Further, at the sampling time T11, the altitude change state of the user transitions from the descending state to the non-elevating state, and at the sampling time T13 two times after the sampling time T11, the altitude change state of the user is not from the descending state. Transition to the lifted state. Although not shown, the electronic device 10 follows the transition of the actual altitude change state in response to the transition from the ascending state to the descending state and the transition from the descending state to the ascending state. A determination result that matches the state can be obtained.

Next, the determination of the altitude change state by the rectangular detection window W2 will be described.
FIG. 5 is a diagram illustrating the determination result of the altitude change state by the rectangular detection window W2 and an example of the actual altitude change state.
The graph shown in FIG. 5 is the same as the graph shown in FIG. Also, the user's altitude change state shown in FIG. 5 is the same as the user's altitude change state shown in FIG. 4.
The length of the determination section of the detection window W2 shown in FIG. 5 is the same as that of the detection window W1 shown in FIG. However, the detection window W2 differs from the detection window W2 in that the threshold altitude range at the measurement reference time point and the threshold altitude range at the past reference time point are the same altitude range.

  When the rectangular detection window W2 is used, it is determined that the user is in the non-lifting state from the sampling time T1 to the sampling time T3. Further, it is determined that the user is in the rising state from the sampling time T3 to the sampling time T9. Further, it is determined that the user is in the descending state from the sampling time T9 to the sampling time T13. Further, it is determined that the user is in the non-lifting state from the sampling time T13 to the sampling time T15. Further, it is determined that the user is in the rising state from the sampling time T15 to the sampling time T16.

  When the determination results by the detection window W1 and the detection window W2 are compared, it can be confirmed that the determination results up to the sampling time T15 are the same. However, in the case of the detection window W2, it is determined that it is in the rising state from the sampling time T15 to the sampling time T16, and does not match the actual altitude change state of the user. That is, in the case of the detection window W2, the determination result at the sampling time T16 is not correct.

Next, the determination of the altitude change state by the rectangular detection window W3 will be described.
FIG. 6 is a diagram showing the determination result of the altitude change state by the rectangular detection window W3 and an example of the actual altitude change state.
The graph shown in FIG. 6 is the same as the graph shown in FIG. Further, the user's altitude change state shown in FIG. 6 is the same as the user's altitude change state shown in FIG. 4.
The length of the determination section of the detection window W2 shown in FIG. 6 is the same as the detection window W1 shown in FIG. 4 and the detection window W2 shown in FIG. Similarly to the detection window W2, the detection window W3 has the same altitude range as the threshold altitude range at the measurement reference point and the threshold altitude range at the past reference point. However, the threshold altitude range of the detection window W3 is set wider than the threshold altitude range of the detection window W2.

  When the rectangular detection window W3 is used, it is determined that the user is in a non-lifting state from the sampling time T1 to the sampling time T4. In addition, it is determined that the user is in the rising state from the sampling time T4 to the sampling time T5. Further, it is determined that the user is in the non-lifting state from the sampling time T5 to the sampling time T6. Further, it is determined that the user is in the rising state from the sampling time T6 to the sampling time T8. Further, it is determined that the user is in the non-lifting state from the sampling time T8 to the sampling time T10. Further, it is determined that the user is in the descending state from the sampling time T10 to the sampling time T13. Further, it is determined that the user is in the non-lifting state from the sampling time T13 to the sampling time T16.

  When the determination result by the detection window W3 is compared with the actual altitude change state of the user, for example, the altitude change state of the user is in the rising state between the sampling time T5 and the sampling time T6. The determination result is in a non-lifting state and does not match. Further, for example, during the period from the sampling time T8 to the sampling time T9, the altitude change state of the user is a descending state, whereas the determination result is a non-raising / lowering state, which is not consistent. Thus, in the detection window W3, there is an increased chance that the ascending state or the descending state is erroneously determined as the non-elevating state.

Here, the reason for the erroneous determination by the detection window W2 and the detection window W3 will be described.
The detection window W2 has a relatively narrow threshold height range. Therefore, similarly to the detection window W1, even when the user moves in the vertical direction at a slow speed, a change in altitude can be detected with high sensitivity, so that the altitude change state can be determined with high accuracy. . However, since the sampled altitude includes a measurement error of about ± 1 to 2 [m], for example, even if the altitude is not actually changed, the sampled altitude is sampled due to the measurement error. The value of increases or decreases. Here, when a narrow threshold altitude range is assumed as in the detection window W2, an altitude deviating from the threshold altitude range may be detected. Therefore, for example, between the sampling time T15 and the sampling time T16 in FIG. 5, there are cases where it is erroneously determined as an ascending state or a descending state even though it is actually not in the ascending / descending state.

On the other hand, the detection window W3 has a relatively wide threshold altitude range. In this case, unlike the detection window W2, even when the sampled altitude fluctuates due to a measurement error, it is less likely that the non-lifting state is erroneously determined as the rising state or the falling state. However, when moving at a slow speed in the altitude direction, a change in altitude cannot be detected. Therefore, for example, as in the period from the sampling time T5 to the sampling time T6 in FIG. Further, as in the sampling time T8 to the sampling time T10 in FIG. 6, it may be erroneously determined as the non-lifting state although it is actually in the lowering state.
Thus, when a uniform threshold altitude range is provided in the determination section, it is not always possible to accurately determine the altitude change state.

In contrast to these rectangular detection windows W2 and W3, the detection window W1 is a trapezoidal area. That is, in the case of the detection window W1, the threshold altitude range is set narrower as it goes back in the determination section, and the threshold altitude range is set wider as it approaches the measurement reference time point.
Here, the effect by the detection window W1 being trapezoid type is demonstrated. Here, for convenience of explanation, it is assumed that the user is continuously moving in the altitude direction.

In the present embodiment, the detection window W1 is set based on the reference altitude measured at the measurement reference time.
When the sampling time is close to the measurement reference time, that is, when the time from the sampling time to the measurement reference time is relatively short, the actual change in altitude between the sampling time and the measurement reference time is relatively small. . Also, if the sampling time is far from the measurement reference time, that is, if the time from the sampling time to the measurement reference time is relatively long, the actual altitude change from the sampling time to the measurement reference time is relatively growing.
On the other hand, the measurement error range in sampling is constant.

Therefore, the closer the sampling time is to the measurement reference time, the greater the influence of the measurement error on the change in altitude due to actual movement in the height difference between the height sampled at the sampling time and the reference height. In addition, the farther the sampling time is from the measurement reference time, the more the difference in altitude between the altitude sampled at the sampling time and the reference altitude, the effect of measurement error on the altitude change due to actual movement is Less.
Therefore, as in the detection window W1, by providing a wide threshold altitude range on the measurement reference time side and narrowing a threshold altitude range on the past reference time side, while reducing the influence of measurement errors that occur in sampling, Altitude changes can be detected with high sensitivity.
Note that the above description does not exclude the adoption of a fixed lower limit threshold line or upper limit threshold line over the determination section as in the detection windows W2 and W3.
This completes the description of the relationship between the shape of the detection window and the determination of the altitude change state.

Next, an example of processing in which the lifting speed calculation unit 1012 calculates the lifting speed will be described.
The altitude sampled from the altitude change determining unit 1011 is input to the ascending / descending speed calculating unit 1012 at a predetermined sampling interval ΔT. The ascending / descending speed calculating unit 1012 calculates a difference between the current altitudes by subtracting the previous altitude from the input current altitude. The immediately preceding altitude is the altitude sampled immediately before the current altitude. The ascending / descending speed calculation unit 1012 calculates the current speed by dividing the calculated difference by the sampling interval ΔT.

  The ascending / descending speed calculating unit 1012 averages (moving average) the ascending / descending speeds calculated for each sampling in the section from the starting time to the current time t. The starting time is a time t−ΔT2 that is past the current time t by a second time interval ΔT2. By performing the moving average, the ascending / descending speed for each sampling is smoothed. In the following description, the section from the past time t−ΔT2 to the current time t is referred to as “moving average section”, and the length of the moving average section is referred to as “moving average section length”. The moving average section length is ΔT2.

  Here, the ascending / descending speed calculation unit 1012 determines whether or not the current altitude change state has changed from the previous altitude change state based on the altitude change state information input from the altitude change determination unit 1011. When it is determined that the altitude change state has changed, the lifting speed calculation unit 1012 reduces the moving average section length to the first time interval ΔT1. In other words, the moving average section length (second time interval ΔT2) may be temporarily equal to the first time interval ΔT1, but is otherwise larger than the first time interval ΔT1.

  When it is determined that the altitude change state has changed, the ascending / descending speed calculation unit 1012 may temporarily set the moving average section length to a time interval shorter than the first time interval ΔT. The term “temporary” refers to a sampling time when it is determined that the altitude change state has changed, or a predetermined time (for example, until a first time interval elapses) from the sampling time. In addition, the time interval shorter than the first time interval may include at least two samples, that is, the current time and the immediately preceding sampling time.

  Thereby, when the altitude change state changes, it is possible to improve the response until the moving average value of the lifting speed is displayed by shortening the moving average section length. In addition, since the previous ascent / descent speed up to the time that is back by the moving average section length from the present, that is, the ascent / descent speed before the altitude change state changes, is ignored, the user's actual feeling according to the altitude change state at that time A moving average value suitable for is obtained. This is particularly effective when the altitude change state changes from an ascending state to a descending state, or vice versa.

  If it is determined that the altitude change state has not changed, the ascending / descending speed calculation unit 1012 determines whether the moving average section length has reached a predetermined third time interval (the maximum value of the second time interval). Determine. If it is determined that the third time interval has been reached, the lifting speed calculation unit 1012 does not change the moving average section length. When it is determined that the third time interval has not been reached, the ascending / descending speed calculation unit 1012 expands the moving average section length with the same degree of progress as the time has elapsed. Here, the ascending / descending speed calculation unit 1012 determines, for example, the end point of the moving average section as the current sampling time without changing the sampling time that is the starting point of the moving average section.

  Note that since the altitude change state information does not exist immediately after the electronic device 10 is activated, the ascending / descending speed calculating unit 1012 may set the current ascending / descending speed to 0. In addition, during the current time from activation to the first time interval, the ascending / descending speed calculation unit 1012 may determine the current ascending / descending speed by averaging the ascending / descending speed sampled from the activation to the current time. Meanwhile, the altitude change determination unit 1011 may not determine the altitude change state.

FIG. 7 is a diagram illustrating a setting example of the moving average section.
FIGS. 7A and 7B show the sampled altitude at each sampling time with x marks, and the moving average sections related to the sampling times t6 to t14 are indicated by horizontal arrows dm6 to dm14, respectively. The horizontal and vertical axes in FIGS. 7A and 7B indicate time and altitude, respectively. Below the horizontal axis, the value of the altitude change state at each sampling time is shown. +1, 0, and -1 indicate an ascending state, a non-elevating state, and a descending state, respectively. In the example shown in FIG. 7, the first time interval and the third time interval are 5, 10 samples, respectively.

FIG. 7A shows that during the sampling time t1 to t5, the altitude change state is the non-lifting state (0), during the sampling time t6 to t13, the altitude change state is the rising state (+1), and at the sampling time t14, the altitude change state is It indicates that the change state is the non-lifting state (0).
An arrow dm6 indicates that the moving average section at the sampling time t6 is a section t1 to t6 of 5 samples.
Arrows dm7 to dm11 indicate that the moving average section length increases by one sample at the same progress with time from sampling time t7 to t11. For each of the arrows dm7 to dm11, the starting point of the moving average section is the same as the starting point (sampling time t1) of the moving average section according to the arrow dm6. On the other hand, the end point of the moving average section indicated by the arrows dm7 to dm11 is the current time (sampling time t7 to t11) at each time point.
This is because the ascending / descending speed calculation unit 1012 determines that the altitude change state has not changed and the moving average section length has not reached the third time interval.

Arrows dm12 and dm13 indicate that the moving average interval is shifted so that the moving average interval length is constant at 10 samples at sampling times t12 and t13, and the end point of the moving average interval is the current time at each time point. Show. This is because the ascending / descending speed calculation unit 1012 determines that the altitude change state has not changed and the moving average section length has reached the third time interval.
An arrow dm14 indicates that the moving average section at the sampling time t14 is a section t9 to t14 of 5 samples. This is because the moving speed calculation section 1012 has reduced the moving average section length to the first time interval in response to detecting that the altitude changing state has changed from the rising state to the non-lifting state.

  In the example shown in FIG. 7A, after the moving average section length reaches the third time interval, the moving average section length is reduced to the first time interval in response to the change in the altitude change state. However, it is not limited to this. Even before the moving average section length reaches the third time interval, the moving average section length may be reduced to the first time interval in response to the change in the altitude change state.

FIG. 7B shows that during the sampling times t1 to t5, the altitude change state is the non-lifting state (0), during the sampling times t6 to t9, the altitude change state is the rising state (+1), and the sampling times t10 to t12. In the meantime, the altitude change state is the non-elevating state (0), and at the sampling times t13 and t14, the altitude change state is the descending state (-1).
Arrows dm6 to dm9 indicate that the moving average section length increases by one sample at the same progress with time from sampling time t6 to t9. This is because the ascending / descending speed calculation unit 1012 determines that the altitude change state has not changed and the moving average section length has not reached the third time interval.
An arrow dm10 indicates that the moving average section at the sampling time t10 is a section of t5 to t10 of 5 samples. This is because the moving speed calculation section 1012 has reduced the moving average section length to the first time interval in response to detecting that the altitude changing state has changed from the rising state to the non-lifting state.

Arrows dm11 and dm12 indicate that the moving average section length increases by one sample at the same progress with time from sampling time t11 to t12. This is because the ascending / descending speed calculation unit 1012 determines that the altitude change state has not changed and the moving average section length has not reached the third time interval.
An arrow dm13 indicates that the moving average section at the sampling time t13 is a section t8 to t13 of five samples. This is because the moving speed calculation unit 1012 has reduced the moving average section length to the first time interval in response to detecting that the altitude change state has changed from the non-lifting state to the falling state.
An arrow dm14 indicates that the moving average section length is expanded by one sample interval at the same time as the passage of time at the sampling time t14. This is because the ascending / descending speed calculation unit 1012 determines that the altitude change state has not changed and the moving average section length has not reached the third time interval.

Next, an example of information displayed on the display unit 105 will be described.
FIG. 8 shows an example of information displayed by the display unit 105 according to the present embodiment.
In the example shown in FIG. 8A, the display unit 105 displays the current lifting speed “0 m / h” on the lifting speed display unit 105 c, displays the current altitude “1600 m” on the altitude display unit 105 a, The time “P 10:08” is displayed on the time display unit 105b. “P 10:08” indicates that the current time is 10:08 pm.

  In the example shown in FIG. 8B, the display unit 105 displays the current elevating speed “−280 m / h” on the elevating speed display unit 105 c, and displays the current altitude “2150 m” on the altitude display unit 105 a. The current time “A 8:48” is displayed on the time display unit 105b. “−280 m / h” indicates that the descending speed is 280 m / h. That is, a negative lifting speed indicates a lowering speed, and a positive lifting speed indicates a rising speed. “A 8:48” indicates that the current time is 8:48 am.

  In the example shown in FIG. 8C, the display unit 105 displays the current lifting speed “190 m / h” on the lifting speed display unit 105 c, and displays the current altitude “1750 m” on the altitude display unit 105 a. The time “P 2:48” is displayed on the time display unit 105b. “190 m / h” indicates that the ascending speed is 190 m / h. “P 2:48” indicates that the current time is 2:48 pm.

Next, data processing according to the present embodiment will be described.
FIG. 9 is a flowchart showing data processing according to the present embodiment.
(Step S101) The altitude change determination unit 1011 samples the altitude indicated by the altitude signal input from the altitude measuring unit 108 at predetermined time intervals ΔT. Thereafter, the process proceeds to step S102.

(Step S102) The altitude change determination unit 1011 determines the altitude change state based on the altitude sampled in the determination section from the past time t−ΔT1 to the current time t. For example, if the altitude sampled in the determination section is within the range between the state determination lower limit value and the state determination upper limit value, the altitude change determination unit 1011 indicates that the altitude change state at the current time t is a non-lifting state. It is determined that For example, when at least one of the altitudes sampled in the determination section is lower than the state determination lower limit value, the altitude change determination unit 1011 determines that the altitude change state at the current time t is an ascending state. For example, if at least one of the altitudes sampled in the determination section is higher than the state determination upper limit value, the altitude change determination unit 1011 determines that the altitude change state at the current time t is a descending state.
The altitude change determination unit 1011 outputs altitude change state information indicating the determined altitude change state to the elevation speed calculation unit 1012. Thereafter, the process proceeds to step S103.

(Step S103) The ascending / descending speed calculation unit 1012 determines whether the current altitude change state has changed from the previous altitude change state based on the altitude change state information input from the altitude change determination unit 1011. If it is determined that the change has occurred (YES in step S103), the process proceeds to step S104. When it is determined that there is no change (NO in step S103), the process proceeds to step S105.
(Step S104) The lifting speed calculation unit 1012 reduces the moving average section length to the first time interval ΔT1, and shifts the moving average section so that the end point becomes the current time. Thereafter, the process proceeds to step S108.

(Step S105) The ascending / descending speed calculation unit 1012 determines whether or not the moving average section length has reached a maximum value ΔT2max of a predetermined second time interval. When it is determined that the maximum value ΔT2max has been reached (step S105 YES), the process proceeds to step S107. If it is determined that it has not reached (NO in step S105), the process proceeds to step S106.

(Step S106) The ascending / descending speed calculation unit 1012 enlarges the moving average section length with the same degree of progress as time elapses (increases by the sampling interval ΔT), and shifts the moving average section so that the end point becomes the current time. Thereafter, the process proceeds to step S108.
(Step S107) The ascending / descending speed calculation unit 1012 shifts the moving average section so that the end point becomes the current time without changing the moving average section length. Thereafter, the process proceeds to step S108.

(Step S108) The ascending / descending speed calculating unit 1012 subtracts the immediately preceding altitude from the current altitude for each sampling, calculates the difference between the current altitudes, and divides the calculated difference by the sampling interval Δt to obtain the current ascending / descending speed. Is calculated. The elevating speed calculation unit 1012 calculates the moving average value of the elevating speed by averaging the elevating speeds in the moving average section up to the current time. Thereafter, the process proceeds to step S109.

(Step S109) The control unit 101 generates altitude information including a moving average value of the calculated ascending / descending speed. The control unit 101 outputs the generated altitude information to the display unit 105 and causes the display unit 105 to display the elevation speed. Then, it returns to step S101 and repeats the process of step S102 to step S109 for every sampling interval (DELTA) T.

  Note that the ascending / descending speed calculation unit 1012 performs processing for reducing the moving average section length to the first time interval and shifting the moving average section so that the end point becomes the current time (FIG. 9, step S104). This can be realized by deleting the altitude and the ascending / descending speed before the past by the first time interval from the stored current. In that case, the altitude change determination unit 1011 stores the altitude sampled at each sampling interval ΔT and the ascending / descending rate calculating unit 1012 stores the ascending / descending rate calculated at each sampling interval ΔT in the RAM 110. When calculating the moving average value, the ascending / descending speed calculating unit 1012 uses the ascending / descending speed remaining in the RAM 110 without being erased, and calculates the average value as a moving average value.

In addition, the ascending / descending speed calculation unit 1012 performs a process of expanding the moving average section length with the same degree of progress as time elapses and shifting the moving average section so that the end point becomes the current time (FIG. 9, step S106), the RAM 110 It may be realized by holding the altitude and the ascending / descending speed stored in the memory without erasing.
Further, the ascending / descending speed calculating unit 1012 shifts the moving average section so that the end point becomes the current time without changing the moving average section length (see step S107), and the altitude and the ascending / descending speed stored in the RAM 110. Of these, it may be realized by erasing the altitude and the lifting speed stored earliest.

  In this manner, the moving speed of the lifting speed calculation unit 1012 reduces the moving average section length according to the altitude change state (for example, the change of the lifting state), so that the moving average value of the lifting speed is obtained after the current lifting speed is acquired. Mitigates the delay before being calculated. Therefore, the moving average value can follow the latest lifted state. Then, by reducing the moving average section length to the first time interval used for determining the lifting state, the altitude used for calculating the lifting speed for moving average is made common to the altitude used for determining the lifting state. Therefore, it is possible to match the determined altitude change state with the calculated ascending / descending speed.

  When the altitude change state indicated by the altitude change state information is the non-elevating state, the ascending / descending speed calculating unit 1012 sets the moving average value of the ascending / descending speed to 0 and omits the process of calculating the moving average value. Also good. However, even in that case, the elevation speed calculation unit 1012 determines the altitude change state. When the altitude change state is a non-elevating state, the moving average value of the elevating speed is not significant for the user, and therefore the processing amount can be reduced by omitting the processing related to the calculation.

As described above, the altitude change determination unit 1011 may determine the altitude change state based on the difference between the current altitude h and the altitude sampled within the determination interval. An overview of the processing in this case will be described with reference to FIG.
FIG. 10 is a second diagram illustrating an example of the detection window W1 according to the present embodiment.
In the example illustrated in FIG. 10, five sampling times t, tx, ty, tz, and t−ΔT1 including the end points exist in the period from the measurement reference time t to the past reference time t−ΔT1. That is, in the example illustrated in FIG. 10, the sampling times t, tx, ty, tz, and t−ΔT1 are times that are separated by the sampling interval ΔT, and the sampling times t, tx, ty, tz, and t−ΔT1. The altitude is measured.

  The determination altitude difference at the sampling time t is Δh (t). Similarly, the judgment altitude differences at the sampling times tx, ty, tz, and t−ΔT1 are Δh (tx), Δh (ty), and Δh (tz) Δh (t−ΔT1), respectively. Here, the judgment altitude difference at each sampling time is set so as to decrease as the time interval between the sampling time t, which is the measurement reference time, and each sampling time increases. That is, the determination altitude difference Δh (ty) at the sampling time ty two times before the measurement reference time t is set smaller than the determination altitude difference Δh (tx) at the sampling time tx one time before the measurement reference time t. Has been. Also, the determination altitude difference Δh (tz) at the sampling time tz three times before the measurement reference time t is set smaller than the determination altitude difference Δh (ty) at the sampling time ty two times before the measurement reference time t. Has been.

The altitude change determination unit 1011 measures the altitude measured at each sampling time tx, ty, tz, t−ΔT1 and the altitude (reference altitude) measured at the measurement reference time t in determining the altitude change state. Calculate the difference. Then, the calculated measurement altitude difference is compared with the determination altitude difference at each sampling time. Specifically, for example, the altitude change determination unit 1011 has a measured altitude difference | h (t) −h (tx) | between the altitude h (tx) measured at the sampling time tx and the reference altitude h (t). Is calculated and compared with the determination altitude difference Δh (tx) at the sampling time tx. When the measured altitude difference | h (t) −h (tx) | is equal to or less than the determination altitude difference Δh (tx), h (tx) measured at the sampling time tx is included in the above-described threshold altitude range. It is synonymous with. If the difference | h (t) −h (tx) | is equal to or greater than the determination altitude difference Δh (tx), the altitude h (tx) measured at the sampling time tx is included in the above-described threshold altitude range. It is synonymous with not.
Thus, the altitude change determination unit 1011 may determine the altitude change state by comparing the magnitudes of the measured altitude difference and the determined altitude difference.

As described above, the electronic device 10 according to the present embodiment includes an altitude measuring unit (for example, the altitude measuring unit 108) that measures altitude, and an altitude measuring unit within a predetermined first time interval up to now. An altitude change determination unit (for example, altitude change determination unit 1011) that determines an altitude change state based on the measured altitude. Further, the electronic device 10 has a second time interval that is equal to or longer than the first time interval, and the altitude measured by the altitude measuring unit within the second time interval up to now. And a lifting speed calculation unit (for example, a lifting speed calculation unit 1012) that calculates the lifting speed.
Therefore, since the change state of the altitude is calculated based on the altitude of the time interval (first time interval) that is equal to or shorter than the time interval (second time interval) that averages the ascending / descending speed, Thus, it is possible to measure the stable lifting speed.

  In addition, the electronic device 10 includes an altitude measurement unit (for example, the altitude measurement unit 108) that outputs the measured measurement altitude, and a first measurement altitude (for example, a measurement altitude at a first time point (for example, a measurement reference time point)). A reference altitude), a second measured altitude (eg, altitude h (tx)) that is a measured altitude at a second time before the first time (eg, sampling time tx), and a third time before the second time. A measurement altitude storage unit (for example, RAM 110) that stores a third measurement altitude (for example, altitude h (ty)) that is a measurement altitude (for example, sampling time ty), and a predetermined first determination altitude difference (for example, , A determination altitude difference storage unit that stores a determination altitude difference Δh (tx)) and a predetermined second determination altitude difference (for example, determination altitude difference Δh (ty)) that is smaller than the first determination altitude difference. For example, ROM 111, RAM 110), the first measurement altitude difference that is the difference between the first measurement altitude and the second measurement altitude, and the magnitude relationship between the first determination altitude difference, and the first measurement altitude and the third measurement altitude A determination unit (for example, altitude change determination) that compares the magnitude relationship between the second measured altitude difference, which is the difference between the two, and the second determination altitude difference and determines the movement state (for example, altitude change state) of the device itself in the vertical direction Part 1011)

  In addition, the electronic device 10 sets a measurement unit (for example, an altitude measurement unit 108) that measures altitude, a predetermined first threshold altitude range, and a predetermined second threshold altitude range narrower than the first threshold altitude range. Setting unit (e.g., altitude change determination unit 1011), whether or not the first altitude measured at the first time point is included in the first threshold altitude range, and measured at the second time point before the first time point A determination unit (e.g., altitude change determination unit 1011) that determines a movement state (e.g., altitude change state) of the device in the vertical direction based on whether or not the second altitude is included in the second threshold altitude range; Is provided.

  Thereby, the electronic device 10 can determine the movement state in the vertical direction by comparing a plurality of measured altitudes with different thresholds in the determination section. Therefore, the electronic device 10 should provide a large threshold when the influence of the measurement error is large with respect to a change in altitude due to actual movement, or provide a small threshold when the influence of the measurement error is small. Therefore, the electronic device 10 can accurately determine the movement state in the vertical direction.

In the electronic device 10, the first determination altitude difference is a value corresponding to the time interval between the first time point and the second time point. The second determination altitude difference is a value corresponding to the time interval between the first time point and the third time point.
Thereby, the electronic device 10 weights the measured values of altitudes at a plurality of sampling times in consideration of the actual inclination state of the ascending / descending slope, measurement error, etc., and determines the movement state in the vertical direction. Can do. In other words, the judgment altitude difference at each time point (second time point or third time point) is set and stored as a value that changes with time. That is, even if the time changes, it is not set and stored as the same value. Therefore, the electronic device 10 can accurately determine the movement state in the vertical direction as a value corresponding to the actual situation.

Further, in the electronic device 10, the second determination altitude difference is smaller than the first determination altitude difference by a value corresponding to the time interval between the second time point and the third time point.
Thereby, the electronic device 10 can determine the determination altitude difference according to the time interval between the measurement reference time and the sampling time, for example. Here, for example, the influence of the measurement error on the change in altitude due to the actual movement becomes larger as the measurement reference time is closer. For example, the electronic device 10 can set the determination altitude difference smaller as the time interval between the measurement reference time and the sampling time becomes larger (as the past measurement value becomes larger). The moving state in the direction can be accurately determined as a value corresponding to the actual situation. For example, even when the vehicle is moving up and down a gentle slope, the state determination can be detected with sensitivity.

Further, in the electronic device 10, the determination unit determines that the own device is in an up / down state when the first measurement height difference is greater than or equal to the first determination height difference or the second measurement height difference is greater than or equal to the second determination height difference. Is determined. In other words, if at least one of the measured altitude differences at each time is greater than or equal to the determined altitude difference, it is determined that the lift state is different from the flat ground traveling state (non-lift state).
Thereby, the electronic device 10 can determine that its own device is in the lifted state for at least two altitude measurement values. Therefore, the electronic device 10 can accurately determine the lifted state.

The determination altitude difference storage unit stores a first determination altitude difference and a second determination altitude difference corresponding to each of the movement states, and the determination unit determines the previous determination result in the determination of two consecutive movement states. The next movement state is determined based on the first determination height difference and the second determination height difference corresponding to.
Thereby, the electronic device 10 can change the determination altitude difference, that is, the detection window, according to the determination result of the previous movement state. Therefore, the electronic device 10 can quickly determine a change in the movement state in the vertical direction.

  Moreover, in the electronic device 10, the setting unit includes a first threshold altitude range having at least one of limit values at both ends (for example, a state determination upper limit value and a state determination lower limit value) as a first threshold value, and limit values at both ends. A second threshold altitude range having at least one of the values as a second threshold and a second threshold altitude range narrower than the first threshold altitude range is set, and the determination unit includes the first altitude and the first altitude range. The change tendency is determined according to either or both of the comparison result with the threshold altitude range and the comparison result between the second altitude and the second threshold altitude range.

  Thereby, the electronic device 10 eliminates the measurement error of the altitude sampled on the measurement reference time point side in a wide threshold altitude range. Further, the gentle up / down is detected by a narrow threshold altitude range on the past reference time point side. Therefore, the electronic device 10 can accurately determine the altitude change tendency.

  In the electronic device 10, the setting unit includes a line that connects both ends of the first threshold altitude range with a rectangular shape having apexes at both end points of the first threshold altitude range and both end points of the second threshold altitude range. The first threshold altitude range and the second threshold altitude range are set so as to form a trapezoid with a minute base on the bottom side.

  Thereby, the electronic device 10 can weight the importance of the first altitude and the second altitude in the determination of the change tendency.

  In addition, the electronic device 10 includes a storage unit (for example, the RAM 110 and the ROM 111) that stores the first altitude and the second altitude, and the determination unit includes that the second altitude is not included in the second threshold altitude range; When at least one of the fact that the first altitude is not included in the first threshold altitude range is satisfied, it is determined as an up / down movement state (for example, ascending state, descending state), and the second altitude is within the second threshold altitude range. When it is included and the first altitude is included in the first threshold altitude range, it is determined as a non-elevating movement state (for example, an ascending / descending state).

  Thereby, the electronic device 10 can accurately determine the up / down movement state and the non-up / down movement state.

In addition, in the electronic device 10, the setting unit sets each of the threshold altitude ranges to be compared with each of the altitudes measured at three or more different time points, the vertical end points of each of the threshold altitude ranges, It is set so that at least one of the end points on the lower side in the direction is included in one straight line.
In addition, in the electronic device 10, the setting unit sets each of the threshold altitude ranges to be compared with each of the altitudes measured at three or more different time points, the vertical end points of each of the threshold altitude ranges, It is set so that at least one of the end points on the lower side in the direction is included in one curve.

  Thereby, the electronic device 10 can set the weighted threshold altitude range for the altitude measured between the first time point and the second time point, for example, in the determination of the movement state in the vertical direction. . Therefore, the electronic device 10 can accurately determine the altitude change tendency.

[Second Embodiment]
A second embodiment of the present invention will be described. In addition, about the structure similar to each embodiment mentioned above, the same code | symbol is attached | subjected and description is abbreviate | omitted.
The electronic device 10 according to the present embodiment is an electronic timepiece with an altitude measurement function, similar to the electronic device 10 according to the first embodiment. However, in the present embodiment, the detection window used for determining the altitude change state is different from that in the first embodiment.

FIG. 11 is a diagram illustrating a determination result of the altitude change state by the detection window according to the present embodiment and an example of an actual altitude change state.
In the graph shown in FIG. 11, the horizontal axis indicates time, and the vertical axis indicates altitude. On the horizontal axis, the progress of time corresponds to the graph shown in FIG. Specifically, sampling times T1 ′ to T16 ′ shown in FIG. 11 respectively correspond to sampling times T1 to T16 shown in FIG.

  Moreover, the graph shown in FIG. 11 shows the sampled altitude at each sampling time, similarly to the graph shown in FIG. In the graph shown in FIG. 11, the change in altitude during the sampling time T1 'to T11' is the same as the change in altitude during the sampling time T1 to T11 in the graph shown in FIG. However, the change in altitude after the sampling time T12 'in the graph shown in FIG. 11 is different from the change in altitude after the sampling time T12 in the graph shown in FIG. In the graph shown in FIG. 11, the user's altitude change state after the sampling time T12 'is an ascending state.

  In the example shown in FIG. 11, the altitude change state is determined using three types of detection windows. The length of the determination interval of these three detection windows, that is, the first time interval is set to 5 times the sampling interval. That is, the threshold altitude range is determined for altitudes sampled up to 5 points before the measurement reference time.

Here, three types of detection windows according to the present embodiment will be described.
The first detection window W1 is the same as the detection window W1 according to the first embodiment.
The second detection window W4 is a trapezoidal region with the measurement reference time point side as the bottom. The lower threshold line of the second detection window W4 is set similarly to the first detection window W1. On the other hand, the upper threshold line of the second detection window is set closer to the reference altitude than the upper threshold line of the first detection window W1. That is, in the second detection window W4, the threshold altitude range is not set equally between the upper side and the lower side of the reference altitude, is relatively wide from the reference altitude to the lower side, and relative from the reference altitude to the upper side. Is set narrowly.
The third detection window W5 is a trapezoidal area with the measurement reference time point side as the bottom. The upper threshold line of the third detection window W5 is set in the same manner as the first detection window W1. On the other hand, the lower threshold line of the third detection window is set closer to the reference altitude than the lower threshold line of the first detection window W1. That is, in the third detection window W5, the threshold altitude range is not set equally between the upper side and the lower side of the reference altitude, is relatively narrow from the reference altitude to the lower side, and relative from the reference altitude to the upper side. Widely set.

  The electronic device 10 according to the present embodiment uses the above-described three types of detection windows properly according to the determination result of the altitude change state. Specifically, when it is determined that the vehicle is in the non-elevating state at the measurement reference time point, in the next determination, the altitude change state is determined using the first detection window W1. Further, when it is determined that the state is the rising state at the measurement reference time point, in the next determination, the altitude change state is determined using the second detection window W4. Further, when it is determined that the vehicle is in the descending state at the measurement reference time point, in the next determination, the altitude change state is determined using the third detection window W5.

Here, the reason for using different detection windows will be described.
First, when the altitude change state is a non-lifting state, the user's movement may transition to an ascending state or a descending state. In this way, in the non-lifting state, since the relative moving direction seen from the current moving direction can be both an ascending direction and a descending direction, it is about the same between the upper side and the lower side of the reference altitude. A first detection window W1 having a threshold height range of height difference is used.

  Further, when the altitude change state is an ascending state, the user's movement may transition to a non-elevating state or a descending state. That is, in the up state, the relative movement direction as viewed from the current movement direction is limited to the down direction only. Therefore, when the vehicle is in the ascending state, the second detection window W4 having a narrow threshold altitude range in which the altitude difference above the reference altitude is narrow allows the transition from the ascending / descending state to the non-elevating / decreasing state with high sensitivity. Can be detected.

  Further, when the altitude change state is a descending state, the user's movement may transition to a non-elevating state or an ascending state. That is, in the descending state, the relative movement direction viewed from the current movement direction is limited to the ascent direction. Therefore, in the descending state, the transition from the descending state to the non-elevating state or the ascending state is sensitive by using the third detection window W5 having a threshold altitude range where the altitude difference below the reference altitude is narrow. It can be detected well.

Next, a determination example using three types of detection windows will be described with reference to FIG.
As shown in FIG. 11, the user is determined to be in the non-lifting state from the sampling time T1 ′ to the sampling time T3 ′. Further, it is determined that the state is in the rising state from the sampling time T3 ′ to the sampling time T8 ′. Further, it is determined that the vehicle is in the descending state from the sampling time T8 ′ to the sampling time T12 ′. Further, it is determined that the state is the rising state from the sampling time T12 ′ to the sampling time T16 ′.

  Comparing the actual altitude change state and the determination result, as in the first embodiment using only the first detection window W1, following the transition of the actual altitude change state, the actual altitude change state and It can be confirmed that a matching determination result is obtained. In addition, the electronic device 10 according to the present embodiment can detect the transition of the altitude change state without further delay as compared with the electronic device 10 according to the first embodiment.

  For example, the transition from the rising state to the falling state at the sampling time T7 ′ (corresponding to the sampling time T7 in FIG. 4) is the sampling time T9 two times after the sampling time T7 in the electronic device 10 according to the first embodiment. Has been detected. On the other hand, in the electronic device 10 according to the present embodiment, the transition from the rising state to the falling state is detected at the sampling time T8 'one after the sampling time T7'. In other words, in the electronic device 10 according to the present embodiment, the transition of the altitude change state is detected at the sampling time T8 'immediately before the sampling time T9' (corresponding to the sampling time T9 in FIG. 4). Further, for example, the electronic apparatus 10 according to the present embodiment detects a transition from the descending state to the ascending state at the sampling time T11 'at the sampling time T12' that is one after the sampling time T11 '.

  As described above, the electronic device 10 according to the present embodiment determines the altitude change state using the detection window corresponding to the determination result of the altitude change state. Thereby, the electronic device 10 can detect the transition of the altitude change state without delay.

[Modification]
Next, a modified example of the detection window will be described.
12 to 14 are diagrams showing detection windows W6 to W8 according to modifications of the present invention, respectively.
The detection windows W6 to W8 shown in FIGS. 12 to 14 have different threshold altitude ranges on the measurement reference time point t side and the past reference time point t−ΔT1 side, similarly to the detection window W1. However, in the detection window W1, the upper threshold line UT and the lower threshold line LT are each linear, whereas in the detection windows W6 and W7, the upper threshold line UT and the lower threshold line LT are respectively curved. It is. As described above, either or both of the upper threshold line UT and the lower threshold line LT may be curved. Moreover, this curve may be expressed by a higher-order function of the second or higher order.

  In the detection window W8, the upper threshold line UT and the lower threshold line LT are each a polygonal line. Specifically, the upper limit threshold line UT and the lower limit threshold line LT of the detection window W8 have no inclination on the past reference time side from the change point, and the threshold altitude range is fixed. The altitude difference in the threshold altitude range is a value at which a predetermined ratio of, for example, 90% of the measurement error in sampling converges. The upper threshold line UT and the lower threshold line LT of the detection window W8 are straight lines having a positive slope and a negative slope on the measurement reference time point side from the change point, respectively. Thus, either or both of the upper threshold line UT and the lower threshold line LT may be broken lines. Moreover, this broken line may be expressed by combining arbitrary straight lines or curves. Further, the altitude threshold may be one at each sampling time, or may be a plurality of three or more.

  Note that the length of the determination section is not limited to that described above. For example, the determination interval may be three times or four times the sampling interval. In this case, since the altitude to be compared with the threshold altitude range is limited to 3 and 4 in the determination of the altitude change state, the altitude change determination unit 1011 sets the length of the determination interval to 5 times the sampling interval. The altitude change state can be determined by a simple process compared to the above, and an increase in hardware scale can be suppressed. Further, the length of the determination section may be 6 times or more of the sampling interval. In this way, the length of the determination section may be arbitrarily adjusted.

Note that, as described above, the ascending state and the descending state may be determined more finely by classification.
In this case, the altitude change determination unit 1011 may classify the ascending / descending state based on, for example, the size of the time interval between the sampling time that is the basis for the determination and the measurement reference time point. Specifically, for example, the altitude change determination unit 1011 determines that the altitude measured at the sampling time close to the measurement reference time exceeds the threshold altitude range and is in a state of rapid increase or rapid decrease. In addition, the altitude change determination unit 1011 has, for example, the altitude measured at the sampling time close to the measurement reference time not exceeding the threshold altitude range, and the altitude measured at the sampling time close to the past reference time falls within the threshold altitude range. If it exceeds, it is determined that the state is a gradual rise or a gradual fall.

In addition, the altitude change determination unit 1011 may classify the ascending / descending state based on, for example, the number of altitudes exceeding the threshold altitude range among a plurality of altitudes measured in the determination section. Specifically, for example, the altitude change determination unit 1011 determines that the altitude change has fallen sharply when there are more samples than the upper limit threshold line UT in the determination section. Further, when the number of samples exceeding the upper limit threshold line UT is less than a predetermined number, it is determined that the sample is slowly descending.
As described above, the altitude change determination unit 1011 may classify the ascending / descending state based on the distribution of comparison results between each altitude measured at each sampling time and each threshold altitude range at each sampling time. Good.

  Note that all or some of the functions of each unit included in the electronic device 10 in the above-described embodiment are recorded on a computer-readable recording medium by recording a program for realizing these functions. You may implement | achieve by making a computer system read and run a program. Here, the “computer system” includes an OS and hardware such as peripheral devices.

  The “computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, and a CD-ROM, and a storage unit such as a hard disk built in the computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory inside a computer system serving as a server or a client in that case may be included and a program held for a certain period of time. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the operation input unit 104 includes two key input units, but is not limited thereto. The number may be predetermined according to the number of functions of the electronic device 10, for example, one or more than two.
In the embodiment described above, the electronic device 10 is an electronic timepiece with an altitude measurement function, but is not limited thereto. The electronic device 10 may be any electronic device, for example, a multi-function mobile phone (so-called smartphone) as long as it has an advanced measurement function.

  DESCRIPTION OF SYMBOLS 10 ... Electronic device, 101 ... Control part, 1011 ... Altitude change determination part, 1012 ... Lifting speed calculation part, 102 ... Oscillation circuit, 103 ... Dividing circuit, 104 ... Operation input part, 105 ... Display part, 106 ... Battery, 107: Barometric pressure measurement unit, 108: Altitude measurement unit, 110: RAM, 111: ROM

Claims (8)

An altitude measurement unit that outputs the measured altitude,
The first measured altitude that is the measured altitude at the first time point, the second measured altitude that is the measured altitude at the second time point before the first time point, and the measurement at the third time point before the second time point A measurement altitude storage unit for storing a third measurement altitude that is an altitude;
A determination altitude difference storage unit that stores a predetermined first determination altitude difference and a predetermined second determination altitude difference that is smaller than the first determination altitude difference;
The first measurement altitude difference that is the difference between the first measurement altitude and the second measurement altitude is compared with the first determination altitude difference, and the first measurement altitude and the third measurement altitude are compared. A determination unit that compares the magnitude relationship between the second measurement height difference that is a difference between the second determination height difference and the second determination height difference, and determines a movement state of the device in the vertical direction;
An altimeter characterized by comprising. The first determination altitude difference is a value corresponding to a time interval between the first time point and the second time point, and the second determination altitude difference is a time interval between the first time point and the third time point. The altimeter according to claim 1, wherein the altimeter is a value corresponding to the altimeter. The second determination altitude difference is smaller than the first determination altitude difference by a value corresponding to a time interval between the second time point and the third time point. The altimeter described in The determination unit determines that the device is in an up / down state when the first measured height difference is greater than or equal to the first determined height difference, or when the second measured height difference is greater than or equal to the second determined height difference. The altimeter according to any one of claims 1 to 3, wherein: The determination altitude difference storage unit stores a first determination altitude difference and a second determination altitude difference corresponding to each of the movement states,
In the determination of the movement state twice in succession, the determination unit determines the next movement state based on the first determination altitude difference and the second determination altitude difference corresponding to the previous determination result. The altimeter according to any one of claims 1 to 4, characterized in that: An altitude measuring unit for measuring altitude;
A setting unit for setting a predetermined first threshold altitude range and a predetermined second threshold altitude range narrower than the first threshold altitude range;
Whether or not the first altitude measured at the first time point is included in the first threshold altitude range, and the second altitude measured at the second time point before the first time point is included in the second threshold altitude range. A determination unit that determines a movement state of the device in the vertical direction based on whether or not
An altimeter characterized by comprising. The setting unit includes a quadrangular shape having vertices at both end points of the first threshold altitude range and both end points of the second threshold altitude range below a line segment connecting both ends of the first threshold altitude range. The altimeter according to claim 6, wherein the first threshold altitude range and the second threshold altitude range are set so as to form a trapezoid on the bottom side. The setting unit includes a threshold altitude range to be compared with each of altitudes measured at three or more different time points, a vertical upper end point of each of the threshold altitude ranges, and a vertical lower end point. The altimeter according to claim 6 or 7, wherein at least one of each is set to be included in one curve.

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