JP2017049090A - Positioning device, portable apparatus and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a positioning device capable of improving the positioning accuracy while power saving, a portable apparatus and an electronic apparatus including the positioning device.SOLUTION: The electronic apparatus includes: a GPS reception section 105 that receives a satellite signal to generate position information; a pressure sensor 106 that detects a pressure; and a control unit 110 that determines whether or not the GPS reception section 105 is under water using a detection result by the pressure sensor 106 and controls the receive timing of GPS reception section 105 using the determination result.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a positioning device, a portable device, and an electronic device.

  For example, there is a positioning device that performs positioning using a satellite signal transmitted from a GPS satellite used for GPS (Global Positioning System), which is one of the Global Navigation Satellite System (GNSS) using an artificial satellite. Generally known.

  In recent years, for example, wristwatch-type portable devices that are used by being worn by swimmers have been put to practical use as electronic devices equipped with such positioning devices. Here, if the reception timing of the GPS receiver overlaps when the GPS receiver is underwater, the positioning accuracy decreases and the power consumption increases.

  Therefore, for example, the wristwatch described in Patent Document 1 has a GPS receiver and an acceleration sensor, and recognizes that the swimmer's arm is at the zenith using the detection result of the acceleration sensor. The movement and the reception timing of the GPS receiver are synchronized.

US Patent Application Publication No. 2009/0295596

  Since the wristwatch described in Patent Document 1 does not detect that the GPS receiver is above the water surface, for example, positioning is performed even when the arm is in the zenith while being submerged in water. End up. Therefore, there existed a problem that positioning accuracy fell and power consumption might increase.

  An object of the present invention is to provide a positioning device capable of achieving high accuracy and power saving of positioning accuracy, and to provide a portable device and an electronic device including the positioning device.

Such an object is achieved by the present invention described below.
The positioning device of the present invention includes a receiver that receives satellite signals and generates position information;
A pressure sensor for detecting pressure;
A control unit that controls reception timing of the receiver using a detection result of the pressure sensor.

  According to such a positioning device, it is possible to determine with high accuracy whether or not the receiver is below the surface of the water using the detection result of the pressure sensor. Therefore, the reception timing of the receiver can be controlled with high accuracy so as not to be received when the receiver is under water. As a result, it is possible to achieve high positioning accuracy and power saving.

  In the positioning device of the present invention, the control unit includes a determination unit that determines whether the receiver is below the surface of the water using the detection result of the pressure sensor, and uses the determination result of the determination unit. It is preferable to control the reception timing of the receiver.

  Thereby, the reception timing of the receiver can be controlled so as not to receive when the receiver is under water.

In the positioning device of the present invention, it is preferable that the control unit stops the operation of the receiver when it is determined that the receiver is under water.
Thereby, power saving can be achieved efficiently.

In the positioning device according to the aspect of the invention, it is preferable that the determination unit determines that the receiver is under water when the output value of the pressure sensor is equal to or greater than a set value.
Thereby, it is possible to easily and accurately determine whether or not the receiver is below the water surface.

In the positioning device of the present invention, it is preferable that the determination unit obtains a value obtained by differentiating the output value of the pressure sensor, and determines that the receiver is below the water surface when the value is equal to or greater than a set value.
Thereby, it is possible to easily and accurately determine whether or not the receiver is below the water surface.

In the positioning device of the present invention, it is preferable to include a storage unit that stores the set value.
Thereby, for example, the pressure on the water surface in the use environment can be measured at the time of calibration or the like, and the set value can be set in advance using the measurement result. Therefore, it can be determined with high accuracy whether or not the receiver is below the water surface.

  In the positioning device of the present invention, it is preferable that the sampling frequency of the pressure sensor can be adjusted.

  As a result, when it is necessary to determine whether or not the receiver is under the surface of the water, the sampling frequency of the pressure sensor is increased to increase the accuracy of the determination result. On the other hand, when such a determination is not required, the pressure sensor The sampling frequency can be lowered to save power.

  In the positioning device according to the aspect of the invention, it is preferable that the control unit adjusts a reception timing cycle of the receiver using a detection result of the pressure sensor.

  As a result, when the timing when the receiver is below the water surface is periodic, such as when swimming, the reception timing of the receiver is set so as not to be received when the receiver is below the water surface using the periodicity. Can be controlled.

  In the positioning device of the present invention, it is preferable that the control unit adjusts a reception timing period of the receiver using a determination result of the determination unit.

  Thereby, the reception timing of the receiver can be controlled so as not to receive when the receiver is under water.

  In the positioning device of the present invention, it is preferable that the control unit synchronizes reception timing of the receiver with timing when the receiver is on the water surface, using a determination result of the determination unit.

  Thereby, the reception timing of the receiver can be controlled to receive when the receiver is on the water surface.

The portable device of the present invention includes the positioning device of the present invention.
Thereby, in the portable device utilized both on the water and in the water, it is possible to achieve high accuracy of positioning and power saving.

The portable device of the present invention is preferably a wristwatch type.
Such wristwatch-type portable devices are often used both on the water and underwater as in swimming. Therefore, when the present invention is applied to such a portable device, the effect becomes remarkable.

An electronic apparatus according to the present invention includes the positioning device according to the present invention.
Thereby, in the electronic device utilized on both the water and underwater, the positioning accuracy can be improved and the power can be saved.

It is a top view which shows the electronic device (watch-type portable apparatus) which concerns on 1st Embodiment of this invention. It is a block diagram which shows the control system of the electronic device shown in FIG. 3 is a flowchart for explaining switching of operation modes by a control unit shown in FIG. 2. It is a figure which shows the detection result of the pressure sensor at the time of swimming (crawl). It is a figure for demonstrating the reception timing of the GPS receiver in 1st Embodiment of this invention. It is a figure for demonstrating the reception timing of the GPS receiver in 2nd Embodiment of this invention. It is a figure for demonstrating the reception timing of the GPS receiver in 3rd Embodiment of this invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a positioning device, a portable device, and an electronic device according to the invention will be described with reference to the accompanying drawings. Hereinafter, a case where the electronic device of the present invention is applied to a watch-type portable device will be described as an example.

<First Embodiment>
FIG. 1 is a plan view showing an electronic apparatus (watch-type portable apparatus) according to the first embodiment of the present invention. FIG. 2 is a block diagram showing a control system of the electronic device shown in FIG.

  An electronic device 10 shown in FIG. 1 is a wristwatch type portable device. As shown in FIG. 1, the electronic device 10 includes a case 101, a display unit 102 provided on one surface (front surface) of the case 101, a plurality of operation buttons 103 provided on a side surface of the case 101, It has. The case 101 is provided with a band 104 used when being worn on the user's arm. The electronic device 10 having such a wristwatch-type exterior part (the case 101 and the band 104) is excellent in portability.

  The case 101 has a hollow flat shape. A display unit 102 is provided on one flat plane side of the case 101. The case 101 has a waterproof function that prevents water from entering the case 101. Thereby, the electronic device 10 can be utilized underwater.

  2, the electronic device 10 includes a display unit 102, a GPS receiving unit 105, a pressure sensor 106, a temperature sensor 107, an acceleration sensor 108, a gyro sensor 109, a wireless communication unit 111, a control unit 110, a power circuit 112, A battery 113 and analog-digital conversion units 115 to 118 are provided, and these are housed in the case 101 described above. Here, the configuration including the GPS receiver 105, the pressure sensor 106, and the controller 110 constitutes a “positioning device”. Note that the temperature sensor 107, the acceleration sensor 108, the gyro sensor 109, the analog-digital conversion unit corresponding thereto, and the wireless communication unit 111 may be provided as necessary and may be omitted. The electronic device 10 may include another sensor such as a magnetic sensor, a vibration unit having a vibration function, a sound generation unit (speaker) that generates sound, and the like.

  The display unit 102 is configured to be able to display various types of information such as time information, temperature information (outside air temperature information), atmospheric pressure information, position information, altitude information, inclination information, and timekeeping information as necessary. Such a display unit 102 includes, for example, a display panel such as a liquid crystal panel or an organic electroluminescence panel, and a drive circuit that drives the display panel.

  A GPS receiver 105 (receiver) receives a satellite signal transmitted from a GPS satellite used in a GPS (Global Positioning System), which is one of the Global Navigation Satellite System (GNSS) using an artificial satellite. It has a function to receive. In addition, the GPS receiving unit 105 calculates the current position of the GPS receiving unit 105 (that is, the current position of the electronic device 10) and time information based on orbit information and time information superimposed on the satellite signal, A process for generating an accurate timing signal (1PPS) updated every second is performed. Here, the GPS receiving unit 105 is a “receiver” that receives satellite signals and generates position information.

  Such a GPS receiver 105 includes a GPS receiver 1051 and a GPS antenna 1052. For example, the GPS receiver 1051 includes an RF (Radio Frequency) unit and a baseband unit. The RF unit includes, for example, an LNA (Low Noise Amplifier), a mixer, a VCO (Voltage Controlled Oscillator), a PLL (Phase Locked Loop) circuit, an IF amplifier, an IF (Intermediate Frequency) filter, an ADC (A / D converter), and the like. It is configured to include. The baseband unit includes, for example, a DSP (Digital Signal Processor), a CPU (Central Processing Unit), an SRAM (Static Random Access Memory), and an RTC (Real Time Clock). In addition, a temperature-compensated crystal oscillation circuit (TCXO: Temperature Compensated Crystal Oscillator), a flash memory, and the like are connected to the baseband unit.

  The pressure sensor 106 has a function of detecting the atmospheric pressure outside the case 101. The pressure sensor 106 includes, for example, a small atmospheric pressure sensor (for example, a MEMS type atmospheric pressure sensor) manufactured using semiconductor manufacturing technology. More specifically, for example, the pressure sensor 106 includes a diaphragm portion that is bent and deformed by receiving pressure, and a strain detection element (for example, a piezoresistive element) that detects the bending of the diaphragm portion. The diaphragm portion is made of, for example, silicon. The strain detection element is, for example, a piezoresistive element.

  The temperature sensor 107 has a function of detecting the temperature outside the case 101. The temperature sensor 107 includes, for example, a thermocouple or a thermistor.

  The acceleration sensor 108 has a function of detecting acceleration applied to the electronic device 10 with three axes. The acceleration sensor 108 includes, for example, an acceleration sensor element manufactured using MEMS technology.

  The gyro sensor 109 has a function of detecting an angular velocity applied to the electronic device 10 with three axes. The gyro sensor 109 includes, for example, an angular velocity sensor element manufactured using MEMS technology.

The wireless communication unit 111 has a wireless communication (transmission and reception) function. More specifically, the wireless communication unit 111 has a function of wirelessly transmitting the detection result of each sensor described above or information obtained by using the detection result. Thereby, the user can receive and use the information wirelessly transmitted from the wireless communication unit 111 by a host (not shown) such as a personal computer, for example.
Such a wireless communication unit 111 includes an antenna 1111 and a communication circuit 1112.

  The antenna 1111 is not particularly limited. For example, the antenna 1111 is made of a metal material, carbon, or the like, and forms a winding, a thin film, or the like. Note that the antenna 1111 may be configured with one antenna in common for transmission and reception, or may be configured with two antennas corresponding to transmission and reception, respectively.

  The communication circuit 1112 includes, for example, a transmission circuit for transmitting electromagnetic waves, a modulation circuit having a function of modulating a signal to be transmitted, a reception circuit for receiving electromagnetic waves, and a demodulation having a function of demodulating a received signal. Circuit. Note that the communication circuit 1112 includes a down-converter circuit having a function of converting a signal frequency to a low level, an up-converter circuit having a function of converting a signal frequency to a high level, an amplifier circuit having a function of amplifying a signal, and the like. Also good.

  Each of the analog-digital conversion units 115 to 118 includes an analog-digital conversion circuit that converts an analog signal into a digital signal. The analog-digital conversion unit 115 converts an analog signal (pressure detection signal) from the pressure sensor 106 into a digital signal. The analog-digital conversion unit 116 converts an analog signal (temperature detection signal) from the temperature sensor 107 into a digital signal. The analog-digital conversion unit 117 converts an analog signal (acceleration detection signal) from the acceleration sensor 108 into a digital signal. The analog-digital conversion unit 118 converts an analog signal (angular velocity detection signal) from the gyro sensor 109 into a digital signal. Here, each of the analog-digital converters 115 to 118 performs conversion at a predetermined sampling frequency based on a clock signal from a clock circuit (not shown).

The storage unit 114 has a function of storing information necessary for the operation of the control unit 110.
The control unit 110 has a function of controlling each unit of the electronic device 10. Specifically, for example, the control unit 110 is based on information obtained from a sensor or the like included in the electronic device 10, and includes time information, temperature information (outside air temperature information), atmospheric pressure information, position information, altitude information, and slope information. Various information such as timing information is displayed on the display unit 102 as necessary. Further, the control unit 110 has a function of changing the type and display form of information displayed on the display unit 102 and switching the operation mode of the electronic device 10 by operating the operation buttons 103.

  Here, the information displayed on the display unit 102 may display the detection result of each sensor as it is, or may display the result of calculation as necessary based on the detection result. For example, the time information is obtained from an output from the GPS receiving unit 105 or a calculation result based on the output. The temperature information is obtained from a detection result of the temperature sensor 107 or a calculation result based on the detection result. The atmospheric pressure information is obtained from a detection result of the pressure sensor 106 or a calculation result based on the detection result. The position information includes latitude information, longitude information, and altitude information (elevation information). The latitude information and longitude information are obtained from a calculation result based on the output from the GPS receiver 105, and the altitude information is detected by the pressure sensor 106. It is obtained from the calculation result based on the result. The inclination information is obtained from a calculation result based on an output (time information, latitude information, and longitude information) from the GPS receiver 105 and a detection result (altitude information) of the pressure sensor 106. The time measurement information is obtained from the calculation result based on the output (time information) from the GPS receiving unit 105. These pieces of information are displayed on the display unit 102 singly or in combination of two or more. Further, the detection result of a certain sensor may be corrected based on the detection result of another sensor. For example, the altitude information includes not only the detection result of the pressure sensor 106 but also the output from the GPS receiver 105 (latitude information and longitude information), the detection result of the acceleration sensor 108 (acceleration information), and the detection result of the gyro sensor 109 (angular velocity). Information). Further, since the pressure sensor 106, the acceleration sensor 108, and the gyro sensor 109 generally have temperature characteristics, the detection results of these sensors or information obtained thereby are corrected using the detection results of the temperature sensor 107 or information obtained thereby. (Temperature correction). Thus, detection accuracy can be improved by obtaining a certain piece of information using a plurality of sensors.

  In particular, the control unit 110 has a function of controlling the reception timing of the GPS reception unit 105 using the detection result of the pressure sensor 106. More specifically, the control unit 110 uses the detection result of the pressure sensor 106 to determine whether or not the GPS reception unit 105 is below the water surface (underwater), and uses the determination result to determine whether the GPS reception unit 105 The reception timing of 105 is controlled. Here, it can be said that the control unit 110 includes a “determination unit” that determines whether or not the GPS reception unit 105 is below the water surface (underwater) using the detection result of the pressure sensor 106.

  In the present embodiment, the control unit 110 controls the reception timing of the GPS receiving unit 105, “normal mode (power saving mode)” assuming the use of the electronic device 10 on the water, and swimming of the electronic device 10. Switching to “swimming mode (high accuracy mode)”, which is assumed to be used in Japan, is possible. The reception timing of the GPS receiving unit 105 will be described in detail later.

  Such a control unit 110 includes, for example, a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), an input / output (I / O) port, and the like.

  The power supply circuit 112 has a function of supplying power from the battery 113 to the electronic components or electronic circuits in the case 101 as necessary. The battery 113 is not particularly limited, and for example, a primary battery such as a lithium battery, or a secondary battery such as a lithium ion battery or a nickel metal hydride battery can be used.

  Note that power supply by the power supply circuit 112 may be performed constantly, but when the electronic device 10 has a power switch, the power supply circuit 112 may be turned on and off by operating the power switch. In the case of having an input terminal, when power is input from the power input terminal, the power may be supplied from the power input terminal and the power supply from the battery 113 may be stopped.

(Reception timing of GPS receiver)
Hereinafter, the reception timing of the GPS receiving unit 105 will be described.

  The GPS receiver 105 provided in the electronic device 10 described above cannot receive a satellite signal when it is underwater, or even if it can be received, the reception sensitivity is extremely low, so the positioning accuracy is significantly reduced. In addition, since such a state consumes power wastefully, it causes an increase in power consumption.

  Therefore, the control unit 110 included in the electronic device 10 determines whether or not the GPS receiving unit 105 is under water (underwater) using the detection result of the pressure sensor 106, and the GPS receiving unit 105 is under water. The reception timing of the GPS receiving unit 105 is controlled so that it is not sometimes received. In the present embodiment, the control unit 110 relates to the control of the reception timing of the GPS receiving unit 105, “normal mode (power saving mode)” assumed to be used on the water of the electronic device 10, and swimming of the electronic device 10. It is possible to switch between the “swimming mode (high-accuracy mode)” that is intended for use. Switching between these modes may be performed manually using the operation button 103, but can be automatically performed using the detection result of the pressure sensor 106 as described below.

Hereinafter, switching between the normal mode and the swimming mode will be described.
FIG. 3 is a flowchart for explaining switching of operation modes by the control unit shown in FIG.

  First, for example, when the electronic device 10 is powered on, pressure detection using the pressure sensor 106 is started (step S1). Immediately after the power is turned on, since the electronic device 10 is normally on the water, the pressure sensor 106 detects the atmospheric pressure on the water as a reference pressure value. For example, the calibration is performed immediately after the electronic device 10 is turned on, and the reference pressure value is detected at that time. Then, the reference pressure value is stored in the storage unit 114.

  Thereafter, it is determined whether or not the GPS receiving unit 105 is underwater (step S2). At this time, whether or not the GPS receiver 105 is underwater is determined based on the output value of the pressure sensor 106, for example, as in the following first determination method or first determination method.

  In the first determination method, it is determined whether or not the output value of the pressure sensor 106 is greater than or equal to a set value. When the output value of the pressure sensor 106 is equal to or greater than the set value, it is determined that the GPS receiving unit 105 is below the water surface. On the other hand, when the output value of the pressure sensor 106 is less than the set value, the GPS receiving unit 105 Judge that it is on the surface of the water. Thereby, it can be determined easily and with high accuracy whether the GPS receiving part 105 is under water. The set value used for the first determination method is, for example, a value corresponding to a pressure value that is about 5 to 10 hPa higher than the reference pressure value stored in the storage unit 114 described above.

  Further, by storing the set value in the storage unit 114, for example, the pressure on the water surface in the use environment can be measured at the time of calibration or the like, and the set value can be set in advance using the measurement result. Therefore, it can be determined with high accuracy whether or not the GPS receiving unit 105 is under water.

  In the second determination method, a value obtained by differentiating the output value of the pressure sensor 106 is obtained, and it is determined whether the value is equal to or greater than a set value. When the value is equal to or greater than the set value, it is determined that the GPS receiving unit 105 is below the surface of the water. Thereby, it can be determined easily and with high accuracy whether the GPS receiving part 105 is under water. The set value used for the second determination method is, for example, a value corresponding to a sudden increase in the output value of the pressure sensor 106 per unit time.

  When it is determined that the GPS receiving unit 105 is not underwater, the normal mode is set (step S3). On the other hand, when it is determined that the GPS receiving unit 105 is underwater, the swimming mode is set (step S4).

  After setting to one of the operation modes as described above, it is determined whether or not to end (step S5), and steps S2 to S4 described above are repeated until the end.

  The switching between the normal mode and the swimming mode has been described above. Hereinafter, the normal mode and the swimming mode will be described.

  The normal mode assumes the use of the electronic device 10 on the water and prioritizes power saving, while the swimming mode assumes the use of the electronic device 10 for swimming and prioritizes higher positioning accuracy. Mode.

  FIG. 4 is a diagram illustrating a detection result of the pressure sensor during swimming (crawl). FIG. 5 is a diagram for explaining the reception timing of the GPS receiver in the first embodiment.

  When the user is swimming in the crawl, the user's arm regularly swings in an almost constant cycle. At that time, the electronic device 10 attached to the user's arm goes out of the water surface onto the water surface or enters the water surface from below the water surface in this cycle. Moreover, the pressure under the water surface is extremely larger than the pressure (atmospheric pressure) on the water surface. For this reason, as shown in FIG. 4, the detected pressure of the pressure sensor 106 when the user is swimming in the crawl periodically changes according to the arm swinging motion of the user's arm. . FIG. 4 shows the detected pressure when the sampling frequency of the pressure sensor 106 is 8 Hz and the user swims one round along the outer periphery of a rectangular pool of 25 m in length and 19 m in width. And C are sections that swim in the horizontal direction of the pool, and B and D are sections that swim in the vertical direction of the pool, respectively.

  Here, in order to obtain the waveform of the detected pressure as described above, the sampling frequency of the pressure sensor 106 needs to be higher than the frequency corresponding to the period of movement of the user's arm, for example, the user's arm. It is preferably 5 to 10 times the frequency corresponding to the period of the movement, specifically 5 Hz to 20 Hz.

  As described above, whether or not the GPS receiver 105 is in water can be determined based on whether or not the output value of the pressure sensor 106 is greater than or equal to a set value.

  In the present embodiment, as shown in FIG. 5, when the output value of the pressure sensor 106 is equal to or greater than a set value, it is determined that the GPS receiver 105 is below the water surface, and the operation of the GPS receiver 105 is stopped. On the other hand, when the output value of the pressure sensor 106 is less than the set value, it is determined that the GPS receiver 105 is on the water surface, and the GPS receiver 105 is operated. Note that (a) in FIG. 5 corresponds to the A section in FIG. 4, and (b) in FIG. 5 shows the operation timing of the GPS receiving unit 105 in the same section.

  According to the electronic device 10 as described above, the control unit 110 determines whether the GPS reception unit 105 is under the water surface using the detection result of the pressure sensor 106, and uses the determination result to perform GPS reception. The reception timing of the unit 105 is controlled. Thereby, it is possible to determine with high accuracy whether or not the GPS receiving unit 105 is below the water surface using the detection result of the pressure sensor 106. Therefore, it is possible to control the reception timing of the GPS receiving unit 105 with high accuracy so that the GPS receiving unit 105 is not received when it is under the water surface. As a result, in the watch-type electronic device 10 that is used both on the water and underwater, the positioning accuracy can be improved and the power can be saved.

  In the present embodiment, as described above, the control unit 110 stops the operation of the GPS receiving unit 105 when it is determined that the GPS receiving unit 105 is below the water surface. Thereby, power saving can be achieved efficiently.

  The sampling frequency of the pressure sensor 106 is preferably adjustable. As a result, when it is necessary to determine whether or not the GPS receiver 105 is below the surface of the water (especially when detecting periodic arm movements as described above), the sampling frequency of the pressure sensor 106 is increased, On the other hand, it is possible to increase the accuracy of the determination result. On the other hand, when such determination is not necessary, the sampling frequency of the pressure sensor 106 can be lowered to save power.

Second Embodiment
Next, a second embodiment of the present invention will be described.

  FIG. 6 is a diagram for explaining the reception timing of the GPS receiver according to the second embodiment of the present invention.

  The present embodiment is the same as the first embodiment described above except that the control of the reception timing of the GPS receiver is different.

  In the following description, the second embodiment will be described with a focus on differences from the above-described embodiment, and description of similar matters will be omitted.

  In the present embodiment, the reception timing of the GPS receiving unit 105 is periodic. And the control part 110 adjusts the period of the reception timing of the GPS receiving part 105 using the detection result of the pressure sensor 106, as shown in FIG. Accordingly, when the timing at which the GPS receiving unit 105 is below the water surface is periodic, such as during swimming, the GPS reception is performed so that the GPS receiving unit 105 is not received when the GPS receiving unit 105 is below the water surface by using the periodicity. The reception timing of the unit 105 can be controlled. Note that the period of the reception timing of the GPS receiver 105 may be the same in the normal mode and the swimming mode, but the difference between the high accuracy of the positioning accuracy and the power saving can be efficiently achieved by the difference. Can be planned.

  More specifically, the control unit 110 uses the detection result of the pressure sensor 106 to determine whether or not the GPS reception unit 105 is below the surface of the water, and uses the determination result to determine whether the GPS reception unit 105 Adjust the reception timing cycle. And the control part 110 synchronizes the reception timing of the GPS receiving part 105 with the timing which the GPS receiving part 105 exists on the water surface using the judgment result whether the GPS receiving part 105 is under the water surface. Thereby, the reception timing of the GPS receiving unit 105 can be controlled so that it is not received when the GPS receiving unit 105 is under the surface of the water. For example, it is determined whether or not the timing at which the GPS receiving unit 105 is below or above the water is periodic. If it is periodic, it is determined that the GPS receiving unit 105 is in a swimming state, and the GPS receiving unit 105 is below the water. The magnitude and timing of the reception timing period of the GPS receiving unit 105 are adjusted so that they are not sometimes received.

  In this embodiment, the frequency of the reception timing of the GPS receiver 105 is equal to the frequency corresponding to the period of the user's arm. That is, the period T of the reception timing of the GPS receiver 105 is equal to the period (t / n) of the user's arm. Here, n is the number of swings of the user's arm during time t.

  Further, the shift amount Δt between the reception timing of the GPS receiving unit 105 and the timing at which the GPS receiving unit 105 comes out of the water surface onto the water surface is determined according to the cycle (t / n). t / n) is preferably in the range of 1/10 to 1/3. Thereby, the reception timing of the GPS receiving unit 105 can be controlled so as to be received when the GPS receiving unit 105 is on the water surface.

  Also according to the second embodiment as described above, it is possible to achieve high positioning accuracy and power saving.

  In the present embodiment, all the reception timings of the GPS receiving unit 105 are when the GPS receiving unit 105 is on the water surface, but the ratio when the GPS receiving unit 105 is on the water surface is below the water surface. If the ratio is higher than a certain ratio, a part of the reception timing of the GPS receiving unit 105 may be when the GPS receiving unit 105 is below the surface of the water.

<Third Embodiment>
Next, a third embodiment of the present invention will be described.

  FIG. 7 is a diagram for explaining the reception timing of the GPS receiver according to the third embodiment of the present invention.

  The present embodiment is the same as the first embodiment described above except that the control of the reception timing of the GPS receiver is different.

  In the following description, the third embodiment will be described with a focus on differences from the above-described embodiment, and description of similar matters will be omitted.

  In the present embodiment, the reception timing of the GPS receiver 105 is periodic as in the second embodiment described above, but as shown in FIG. 7, the frequency of the reception timing of the GPS receiver 105 is determined by the user. It is larger than the frequency corresponding to the period of the arm. That is, the reception timing is set so as to thin out a part of the reception timing of the second embodiment described above. Thereby, power saving can be improved.

  According to the third embodiment as described above, the positioning accuracy can be improved and the power can be saved.

  As described above, the positioning device, the portable device, and the electronic device of the present invention have been described based on the illustrated embodiments. However, the present invention is not limited to these, and the configuration of each unit may be any arbitrary function having the same function. It can be replaced with that of the configuration. Moreover, other arbitrary components may be added.

  In the above-described embodiment, a wristwatch-type portable device (watch) is described as an example of the portable device of the present invention. However, the present invention is not limited to this, and the portable device of the present invention is, for example, a mobile phone, a smartphone, a tablet It can be applied to terminals and the like. In addition, the electronic device of the present invention is not limited to the above-described portable device. For example, a digital still camera, an ink jet ejection device (for example, an ink jet printer), a personal computer (mobile personal computer, laptop personal computer), a television set, and the like. , Video cameras, video tape recorders, car navigation devices, pagers, electronic notebooks (including those with communication functions), electronic dictionaries, calculators, electronic game devices, word processors, workstations, videophones, security TV monitors, electronic binoculars, POS Terminals, medical devices (for example, electronic thermometers, blood pressure monitors, blood glucose meters, electrocardiogram measuring devices, ultrasonic diagnostic devices, electronic endoscopes), fish detectors, various measuring devices, instruments (for example, vehicles, aircraft, ship instruments) Class) Yureta, terrestrial digital broadcasting, cellular base stations, can be applied to the GPS module or the like.

DESCRIPTION OF SYMBOLS 10 ... Electronic device, 101 ... Case, 102 ... Display part, 103 ... Operation button, 104 ... Band, 105 ... GPS receiving part, 106 ... Pressure sensor, 107 ... Temperature sensor, 108 ... Accelerometer, 109 ... Gyro sensor, 110 ... Control unit 111 ... Wireless communication unit 112 ... Power supply circuit 113 ... Battery 114 ... Storage unit 115 ... Analog / digital conversion unit 116 ... Analog / digital conversion unit 117 ... Analog / digital conversion unit 118 ... Analog / digital conversion , 1051... GPS receiver, 1052... GPS antenna, 1111... Antenna, 1112... Communication circuit, T .. period, t.

Claims (13)

A receiver that receives satellite signals and generates position information;
A pressure sensor for detecting pressure;
And a control unit that controls the reception timing of the receiver using the detection result of the pressure sensor.   The control unit includes a determination unit that determines whether or not the receiver is below the water surface using the detection result of the pressure sensor, and receives the reception of the receiver using the determination result of the determination unit. The positioning device according to claim 1, wherein the timing is controlled.   The positioning device according to claim 2, wherein when the control unit determines that the receiver is under water, the control unit stops the operation of the receiver.   The positioning device according to claim 2 or 3, wherein the determination unit determines that the receiver is under water when an output value of the pressure sensor is equal to or greater than a set value.   The positioning device according to claim 2 or 3, wherein the determination unit obtains a value obtained by differentiating the output value of the pressure sensor, and determines that the receiver is below the water surface when the value is equal to or greater than a set value.   The positioning device according to claim 4, further comprising a storage unit that stores the set value.   The positioning device according to any one of claims 1 to 6, wherein a sampling frequency of the pressure sensor is adjustable.   The positioning device according to claim 1, wherein the control unit adjusts a reception timing period of the receiver using a detection result of the pressure sensor.   The positioning device according to claim 2, wherein the control unit adjusts a reception timing cycle of the receiver using a determination result of the determination unit.   The positioning device according to claim 9, wherein the control unit synchronizes reception timing of the receiver with timing when the receiver is on the water surface using a determination result of the determination unit.   A portable device comprising the positioning device according to claim 1.   The portable device according to claim 11, which is a wristwatch type.   An electronic apparatus comprising the positioning device according to claim 1.

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