JP5145670B2 - Time correction device, electronic timepiece with time correction device, and time correction method - Google Patents

Description

  The present invention relates to a time adjustment device that corrects time based on a signal from, for example, a GPS satellite, an electronic timepiece with a time adjustment device, and a time adjustment method.

GPS (Global Positioning System), which is a system for positioning its own position, uses GPS satellites that have orbits around the earth. These GPS satellites are equipped with atomic clocks that provide extremely accurate time. Measuring.
For this reason, a proposal has been made to correct the time of the clock with high accuracy using the data of the atomic clock of the GPS satellite (for example, Patent Document 1).
Also proposed is a method of obtaining local time information of the destination when the GPS satellite signal receiver is equipped with a clock that always moves with the user, for example, when the user travels overseas. Has been. (For example, Patent Document 2)
By the way, in order to acquire atomic clock data from a GPS satellite, it is necessary to capture the GPS satellite and synchronize the GPS satellite signal. In addition, GPS satellites are always moving, and in order to capture them, it is necessary to predict and acquire the position of the GPS satellites from the orbit data of the GPS satellites. Furthermore, to obtain accurate time data, it is necessary to acquire at least four GPS satellites.
In addition, it usually takes time to capture the four GPS satellites that move in this way, but in addition to this, if a watch that constantly moves with the user is equipped with a GPS satellite signal receiver, The receiver also moves. However, for example, when you want to obtain local time information that reflects the time difference information of the destination when traveling abroad, it is more difficult to capture GPS satellites. It takes a long time.
Japanese Patent No. 351068 (paragraph “0001” etc.) JP-A-8-110230 (paragraph “0001” etc.)

This consumes power for a long time to capture the GPS satellite, and it has been difficult to mount it on a device such as a watch that requires ultra-low power. Therefore, in reality, there has been a problem that time cannot be adjusted with high precision by a clock or the like.
Therefore, normally, the increase in power consumption is suppressed by setting the interval of capturing GPS satellites and acquiring time data to be once or twice a day.
Therefore, when the location of a clock or the like equipped with a receiver that receives a GPS satellite signal has moved greatly, the user must consciously acquire the time difference information to obtain local time information at the destination. It has been complicated to capture by satellite. In order to improve this, it is preferable to frequently capture GPS satellites. However, in this case, the interval between capturing GPS satellites and acquiring time data is set to once or twice a day. Therefore, it is contrary to the suppression of the increase in power consumption. Therefore, frequently capturing GPS satellites increases power consumption, which is not practical for small devices such as watches.

  Accordingly, the present invention provides a time correction device and time correction capable of correcting time with high accuracy without requiring high power consumption even when the location is moved so much that the time difference changes as ultra-low power is required. An object is to provide an electronic timepiece with a device and a time correction method.

According to the present invention, the subject is a positioning unit that performs positioning by receiving a signal from a position information satellite orbiting the earth,
A time correction information storage unit for storing time correction information for correcting the time information of the time information generation unit for generating time information;
A time information correction unit that corrects the time information based on the time correction information;
An altitude information acquisition unit that acquires altitude information of the positioning unit at predetermined intervals;
An altitude information storage unit for storing the altitude information;
Altitude information acquisition unit based on the altitude information, an altitude information acquisition interval changing unit for changing the interval for acquiring the altitude information,
A time correction device having
A time correction basic information storage unit for storing time correction basic information which is basic information for generating the time correction information;
A time correction information generating unit that generates the time correction information based on the time correction basic information, and
In the time correction basic information,
A plurality of satellite reference time correction basic information which is the basic information for generating the time correction information based on signals from a plurality of the position information satellites;
Based on the plurality of satellite reference time correction basic information, using the positioning information obtained when the time correction information generation unit generates the time correction information, based on a signal from a single position information satellite Singular satellite reference time correction basic information, which is the basic information for generating time correction information, and
Among the time correction basic information, the multiple satellite reference time correction basic information and the single satellite reference time correction basic information are the altitude information acquired previously stored in the altitude information storage unit and the altitude acquired this time. The time adjustment device is selected based on the information comparison result and performs a reception operation for receiving a signal from the position information satellite.

According to the said structure, it has the time correction information storage part which stores the time correction information which corrects the time information of the time information generation part which produces | generates time information. Moreover, it has the time information correction part which corrects time information based on time correction information.
And it has the altitude information acquisition part which acquires the altitude information of a positioning part for every predetermined space | interval, and has the altitude information storage part which memorize | stores the altitude information acquired by this altitude acquisition part. The altitude information acquisition interval changing unit changes the interval at which the altitude information acquisition unit acquires the altitude information based on the altitude information stored in the altitude information storage unit.
Furthermore, a time correction basic information storage unit that stores time correction basic information that is basic information for generating time correction information, a time correction information generation unit that generates time correction information based on the time correction basic information, have.

And as time correction basic information, it has multiple satellite reference time correction basic information which is basic information for generating time correction information based on a signal from a position information satellite.
The multiple satellite reference time correction basic information is a position information satellite, for example, by performing positioning based on a signal from a GPS satellite to obtain its own position information and obtain time information based on the position information. Can do.

Furthermore, in the said structure, based on the above-mentioned multiple satellite reference time correction basic information as a time correction basic information, the positioning information obtained when a time correction information generation part produces | generates time correction information is used. It has single satellite reference time correction basic information which is basic information for generating time correction information based on a signal from a position information satellite.
This single satellite reference time correction basic information is obtained when positioning is performed as described above when the time correction information is generated based on the above-described multiple satellite reference time correction basic information, and the position of the time correction device is known. The positioning position information that has become known is used.

In the above configuration, the above-described two modes, that is, selection for storing selection information for selecting and executing the multiple satellite reference time correction basic information and the single satellite reference time correction basic information based on the altitude information are selected. An information storage unit is provided.
In this multi-satellite reference time correction basic information, since the position of the time correction device on the receiving side is unknown, it is necessary to clarify the position by calculation. For this purpose, the position of both the GPS satellite and the time correction device is required. Need to know. However, in the single satellite reference time correction basic information, the self-position of the time adjustment device acquired by the multiple satellite reference time correction basic information performed in the previous stage is known.

For this reason, in order to grasp | ascertain an error with the atomic clock etc. of a GPS satellite, what is necessary is just to capture a single GPS satellite and to grasp | ascertain the position (orbit position).
If time correction information is generated based on the multiple satellite reference time correction basic information, time correction can be performed with high accuracy. On the other hand, when a plurality of satellites are captured and positioned in this way, time correction is performed. There arises a problem that the power consumption of the apparatus becomes large. However, if the time correction information is generated based on the singular satellite reference time correction basic information, it is only necessary to grasp a single satellite, so that power consumption is reduced.

  Therefore, since the multiple satellite reference time correction basic information and the single satellite reference time correction basic information are selected and executed based on the altitude information, the time correction information is generated based on the multiple satellite reference time correction basic information. While it is possible to correct the time with high accuracy, there is a problem that the power consumption of the time adjustment device increases when capturing and positioning multiple satellites in this way. When using information, unlike the basic information for correcting the multiple satellite reference times, it is only necessary to grasp a single satellite, so that power consumption is reduced.

  For this reason, by properly using these basics (modes) based on the altitude information that is the selection information, it is possible to significantly reduce power consumption while maintaining highly accurate time correction. Therefore, even when the location moves greatly, the power consumption does not increase, and the time adjustment device can be mounted on a device such as a watch that requires ultra-low power. And since these are performed automatically, it is not required for the user to consciously capture by the GPS satellite, and it is not complicated.

Preferably, the altitude information acquisition unit includes a pressure sensor that measures an atmospheric pressure of an external environment of the positioning unit.
According to the said structure, an altitude information acquisition part has a pressure sensor which measures the atmospheric pressure of the external environment of a positioning part. Since the altitude information acquisition unit has a pressure sensor, the pressure of the external environment of the positioning unit, that is, the pressure of the external environment of the time adjustment device, that is, the atmospheric pressure is detected as, for example, a voltage. The pressure sensor can process, for example, a voltage generated by a piezoelectric effect of a vacuum-sealed piezoelectric element, detect it as atmospheric pressure, and convert the detected change in atmospheric pressure as an altitude change. For this reason, the altitude information of the time adjustment device having the positioning unit can be known.

  Preferably, the altitude information storage unit stores at least two altitude information of the altitude information acquired last time by the altitude information acquisition unit and the altitude information acquired this time, and the altitude information acquisition interval is changed. The unit compares the difference between the two times of the height information and the height threshold information of the height threshold information storage unit, and changes the interval at which the height information is acquired by the height information acquisition unit. It is a correction device.

  According to the above configuration, the altitude information storage unit stores altitude information for at least two times of the altitude information acquired last time by the altitude information acquisition unit and the altitude information acquired this time. Then, the altitude information acquisition interval changing unit calculates a difference from the previous and current altitude information for two times and compares it with altitude threshold information in the altitude threshold information storage unit. In addition, the interval at which the altitude information acquisition unit acquires the altitude information is changed.

  For this reason, the altitude information acquisition interval of the altitude information acquisition unit is based on the previous altitude information and the current altitude information, and after comparing the altitude threshold information with the altitude threshold information, If the difference in altitude information is large, the interval for acquiring altitude information is changed. Therefore, after starting the acquisition of altitude information, for example, if the difference between the previous altitude information and the current altitude information is large and the current altitude information is large, the user of the time adjustment device has moved by aircraft. For example, if the difference between the previous altitude information and the current altitude information is large and the current altitude information is small, increase the interval for acquiring altitude information. Alternatively, the initial interval is restored.

  Therefore, the interval for acquiring altitude information can be changed with changes in altitude information, and with this change in altitude information, it is possible to select multiple satellite reference time correction information or single satellite reference time correction information, In addition, selection of multiple satellite reference time correction information can be performed without waste, and waste of power consumption can be reduced.

  Preferably, the time correction device includes a local time difference information storage unit that stores time difference information in the local information, and the plurality of position information satellites are four GPS (Global Positioning System) satellites, The multiple satellite reference time correction basic information is the positioning position information of the time correction device obtained by calculation based on the propagation delay time actually measured until the signals transmitted from the four GPS satellites are received. And the basic information for acquiring and generating the time difference information in the regional information corresponding to the positioning position information, and the time correction information is generated reflecting the time difference information. Is a time correction device characterized by

  According to the above configuration, the time adjustment device has the area information storage unit that stores the time difference information in the area information, and the multiple satellite reference time adjustment basic information is a signal transmitted from four GPS satellites. Based on the actually measured propagation delay time until the time is received, the positioning position information of the time correction device obtained by calculation and the time difference information in the area information corresponding to the positioning position information are acquired and generated. The time correction information reflects time difference information.

  Therefore, even when the location of the time adjustment device has moved greatly, it acquires positioning position information based on signals from the plurality of position information satellites, and generates time difference information in the corresponding area corresponding to the positioning position information. Thus, the time difference information can be reflected in the time correction information, and it is easy to obtain time information suitable for the region.

  Preferably, the single satellite reference time correction basic information uses the position information of the time correction device as the positioning information as a pseudo current position, and the GPS specified from the pseudo current position and the orbit information of the GPS satellite. For generating the true propagation delay time obtained by calculation based on the pseudo-satellite distance specified by the satellite position information and the propagation delay time that is a measurement value measured by the time information generation unit The time correction device is characterized in that it is the basic information.

  According to the above configuration, since the position information of the time adjustment device, which is positioning information, is used as the pseudo current position, it is not necessary to generate multiple time correction information and capture a plurality of satellites. Electric power can be reduced.

According to the present invention, the subject is a positioning unit that performs positioning by receiving a signal from a position information satellite orbiting the earth,
A time correction information storage unit for storing time correction information for correcting the time information of the time information generation unit for generating time information;
A time information correction unit that corrects the time information based on the time correction information;
An altitude information acquisition unit that acquires altitude information of the positioning unit at predetermined intervals;
An altitude information storage unit for storing the altitude information;
Altitude information acquisition unit based on the altitude information, an altitude information acquisition interval changing unit for changing the interval for acquiring the altitude information,
An electronic timepiece with a time correction device,
A time correction basic information storage unit for storing time correction basic information which is basic information for generating the time correction information;
A time correction information generating unit that generates the time correction information based on the time correction basic information, and
In the time correction basic information,
A plurality of satellite reference time correction basic information which is the basic information for generating the time correction information based on signals from a plurality of the position information satellites;
Based on the plurality of satellite reference time correction basic information, using the positioning information obtained when the time correction information generation unit generates the time correction information, based on a signal from a single position information satellite Singular satellite reference time correction basic information, which is the basic information for generating time correction information, and
Among the time correction basic information, the multiple satellite reference time correction basic information and the single satellite reference time correction basic information are the altitude information acquired previously stored in the altitude information storage unit and the altitude acquired this time. A selection information storage unit for storing selection information to be selected and executed based on a comparison result of information and a time display means,
This is achieved by an electronic timepiece equipped with a time adjustment device that performs a receiving operation for receiving a signal from the position information satellite.

  According to the above configuration, even in an electronic timepiece or the like when ultra-low power is required and the location has moved greatly, it is possible to perform time adjustment with low power consumption and high accuracy.

  According to the present invention, the subject is a time correction method for correcting the time information of a time information generation unit that generates time information based on the time correction information, and positioning is performed from a plurality of position information satellites orbiting the earth. Acquiring positioning information of the positioning unit from the signal received by the unit, acquiring time difference information in the positioning information, and generating basic information by reflecting the time difference information in the time correction information. A first time correction information generating step having the first time correction information, and a time information correction unit correcting the time information of the time information generation unit based on the time correction information generated in the first time correction information generation step; The time correction information is generated on the basis of a signal from a single position information satellite using the positioning information obtained by the positioning unit obtained in the time information correction step and the first time correction information generation step. A second time correction information generation step in which the time correction information generation unit generates the time correction information based on single satellite reference time correction basic information which is the basic information of the second time correction information generation step. And a second time information correction step in which the time correction unit corrects the time information of the time information generation unit based on the time correction information generated in step (i). The

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
The embodiments described below are preferred specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless otherwise stated, the present invention is not limited to these embodiments.

FIG. 1 is a schematic view showing an electronic timepiece with a time adjustment device according to the present invention, for example, a wristwatch 10 with a GPS time adjustment device (hereinafter referred to as “GPS wristwatch”), and FIG. 2 is a sectional end view of FIG. FIG. FIG. 3 is a schematic diagram showing the main hardware configuration of the GPS wristwatch 10 of FIGS. 1 and 2.
As shown in FIGS. 1 and 2, the GPS wristwatch 10 has a time display unit 16 on the surface of which a dial 12, a second hand 13a, a minute hand 13b, an hour hand 13c and the like are arranged, and various messages. A display 14 such as an LCD display panel is formed. The display 14 displays message information as well as position information such as latitude, longitude, and city name. And the operation button 17 which a user operates based on this message information is also formed. The pointer 13 is driven via a gear by a step motor including a motor coil 22 and the like.

As shown in FIG. 2, the GPS wristwatch 10 has a GPS device having an antenna 11, and this antenna 11 is a signal from GPS satellites 15 a to 15 d orbiting the earth over a predetermined orbit. Is received. The antenna 11 is disposed on the surface of the dial 12 opposite to the time display surface. The dial 12 is formed of plastic or the like that is a material that transmits radio waves that are signals from GPS satellites.
The GPS satellites 15a to 15d are examples of position information satellites.
A glass 28 is disposed on the surface side of the dial 12. In addition, a pressure sensor 19 is disposed in the space between the secondary batteries 24 below the dial 12, and the GPS wristwatch 10 has an internal side that extends from the side surface of the case 21 so as to communicate with the pressure sensor 19. A hole 20 is provided so that the pressure (atmospheric pressure) of the external environment can be measured. Therefore, the pressure sensor 19 is configured to be able to measure the pressure (atmospheric pressure) by detecting the state of the external environment through the holes 20.

As shown in FIG. 3, the GPS wristwatch 10 includes a time display device 47 and a GPS device 46, and has a configuration that also functions as a computer. The display 14 shown in FIGS. 1 and 2 is also connected.
Hereinafter, each configuration shown in FIG. 3 will be described.
As shown in FIG. 3, the GPS wristwatch 10 includes a GPS device 46 that is a positioning unit, for example, and receives a signal received from the GPS satellite 15 a of FIG. 1 from the antenna 11 through a filter (SAW) 31 or an RF unit (Radio). The baseband unit 30 extracts a signal via a frequency (radio frequency) 27.

  And the positioning information and time information are processed in the control part 23, and the time display of the time display part 16 is corrected. The air movement detection device 45 includes a pressure sensor 19, an ADC (A / D converter) 44, and the like, and the pressure sensor 19 measures the pressure in the outside environment of the GPS wristwatch 10. The pressure sensor 19 includes, for example, a vacuum-sealed piezoelectric element, and the voltage generated by the piezoelectric effect of the piezoelectric element is digitally processed by an ADC (A / D converter) 44 to measure the atmospheric pressure. . The altitude can be obtained from the pressure measurement value by a method described later.

The receiving unit 18 that is a part of the GPS device 46 includes an RF unit 27 and a baseband unit 30. The RF unit 27 includes a PLL circuit 34, an IF filter 35, a VCO 41, an ADC (A / D converter) 42, and the like. It has.
The baseband unit 30 includes a DSP (Digital Signal Processor) 39, an RTC (Real Time Clock) 38, a CPU (Central Processing Unit) 36, an SRAM (Static Random Access Memory) 37, and a crystal oscillation circuit with a temperature compensation circuit. A (TCXO) 32, a flash memory 33, and the like are also connected. The RTC 38 is an example of a time information generation unit that generates time information.

4 to 7 are schematic diagrams showing the main software configuration of the GPS wristwatch 10, and FIG. 4 is an overall view.
As shown in FIG. 4, the GPS wristwatch 10 has a control unit 23, and the control unit 23 has various programs in the various program storage units 50 and various types in the first various data storage unit 60 shown in FIG. 4. The data and the various data in the second various data storage unit 70 are processed.
In FIG. 4, the various program storage unit 50, the first various data storage unit 60, and the second various data storage unit 70 are shown separately, but actually the data is stored separately in this way. Rather, they are shown separately for convenience of explanation.
The first various data storage unit 60 shown in FIG. 4 mainly shows data stored in advance, and the second various data storage unit 70 mainly includes various program storage units 50. The data after processing the data etc. in the 1st various data storage part 60 by each program of this, the data acquired by various programs, etc. are shown collectively.
FIG. 5 is a schematic diagram showing data in the various program storage units 50 of FIG. 4, and FIG. 6 is a schematic diagram showing data in the first various data storage units 60 of FIG. FIG. 7 is a schematic diagram showing data in the second various data storage unit 70 of FIG.
8 to 12 are schematic flowcharts showing main operations and the like of the GPS wristwatch 10 according to the present embodiment.

Hereinafter, according to FIGS. 8 to 12, the operation of the GPS wristwatch 10 according to the present embodiment will be described, and the various programs and data of FIGS.
First, the GPS wristwatch 10 of FIG. 1 is configured to correct the time of the time display unit 16 of the time display device 47 at a certain time. This time correction is performed by receiving a signal from the GPS satellite 15a or the like, as will be described later. The time display device 47 includes a time display unit 16 including a dial 12 and hands 13.
The time adjustment of the time display unit 16 of the time display device 47 is normally performed at regular intervals, for example, about once a day, in one satellite time adjustment mode, which will be described later, in order to reduce power consumption. Time correction is performed by receiving signals from two or more GPS satellites 15a and the like. FIG. 11 shows a schematic flow of the operation. In this one-satellite time correction mode, a positioning result obtained by receiving signals from a plurality of GPS satellites 15a and the like and positioning its own position is used. That is, the self-position of the GPS wristwatch 10 is known by acquiring the positioning data 721 in the positioning data storage unit 72 of FIG. The positioning data storage unit 72 receives signals from a plurality of GPS satellites 15a and the like, and stores positioning results obtained by positioning its own position as positioning data 721. Accordingly, the self-position of the GPS wristwatch 10 can be known, and is a mode in which correction time data can be obtained by receiving signals from one or more GPS satellites 15a and the like.
According to this mode, since the position of its own GPS wristwatch 10 is known, signals from one GPS satellite 15a and the like can be received to obtain corrected time data, so the time for reception can be shortened, Power consumption can be reduced.

However, for example, when the user of the GPS wristwatch 10 moves the position so that the time difference changes, the previously acquired positioning data 721 may not be used. In such a case, it is necessary to newly receive signals from four or more GPS satellites 15a, etc., capture their positions, acquire positioning data, and calculate time difference information. Time correction mode is executed.
Execution of this four-satellite time correction mode takes time to receive all the information because it receives signals from four or more GPS satellites 15a and the like and captures its own position. As a result, power consumption increases. Therefore, the execution of the 4-satellite time correction mode should be performed as smoothly and without waste as possible. Here, for example, when the user of the GPS wristwatch 10 moves so much that the country (time difference) changes greatly in several hours, it is mostly due to the movement of the aircraft.

In the case of aircraft movement, the GPS wristwatch 10 is considered to be in the aircraft with the user. Therefore, if the movement of the aircraft can be automatically determined, one of the 1-satellite time correction mode for generating single-satellite reference time correction information and the 4-satellite time adjustment mode for generating multiple satellite reference time correction basic information is selected. Selection information.
Therefore, as a step before receiving a signal from the GPS satellite 15a or the like, any one mode of one satellite time correction mode for generating single satellite reference time correction information and four satellite time correction mode for generating multiple satellite reference time correction basic information The altitude information that is the selection information when selecting is acquired, and it is determined which mode should be executed. That is, it is determined whether or not the GPS wristwatch 10 has moved greatly. In this case, the location data 721 stored in the positioning data storage unit 72 acquired last time cannot be used because the location has changed greatly due to aircraft or the like. Therefore, in this case, the 4-satellite time correction mode is executed. In other cases, as usual, one satellite time correction mode using the positioning data 721 stored in the positioning data storage unit 72 acquired last time is executed with the position of itself being known.

As described above, altitude information is used as selection information when selecting one of the 1-satellite time adjustment mode for generating single-satellite reference time adjustment information and the 4-satellite time adjustment mode for generating multiple satellite reference time adjustment basic information. Can be used to select the 4-satellite time correction mode for generating basic information on multiple satellite reference time corrections based on altitude information, even when the location has moved greatly, and time data for correction can be acquired. . Normally, the correction time data is generated in the one-satellite time correction mode for generating single satellite reference time correction information, so that power consumption does not increase and high-accuracy time correction is possible.
Further, in the case of the 4-satellite time adjustment mode for generating the multiple satellite reference time correction basic information, the local time difference information stored in advance in the GPS wristwatch 10 in advance, for example, from the position information when the location has moved greatly. Compared with the local time difference information data 631 in the data table storage unit 63, the time difference information at the location of the GPS wristwatch 10 is acquired. Since the time difference information is reflected in the time correction information and the RTC clock display data 742 can be corrected, the time can be adjusted with high accuracy even when the location has moved greatly.

  FIG. 8 shows an overall schematic flow. Flow until acquiring selection information when selecting one of the above-mentioned single satellite time adjustment mode for generating single satellite reference time adjustment information and four satellite time adjustment mode for generating multiple satellite reference time adjustment basic information 8 will be described according to the flow of FIG. 8, and FIG. 9 to FIG.

Before that, here, FIG. 13 is a graph showing the relationship between the atmospheric pressure of the external environment of the GPS wristwatch 10 when using the pressure sensor 19 and the relative data obtained by converting the altitude from the atmospheric pressure when moved by an aircraft or the like. explain.
Black dots indicate altitude. Further, the interval between the black dots indicates the measurement interval. Section A shows a normal state where the aircraft is not boarded, Section B shows a state when boarding the aircraft, Section C shows a case after the aircraft has landed on the ground, Section D shows Moreover, it shows that it returned to the normal state. By the way, although the barometric pressure is not displayed, it can be plotted against the altitude.
The horizontal axis indicates time, and the vertical axis indicates altitude.

Therefore, in section A, the atmospheric pressure is high and the altitude is low, and if the difference between the measurement data for two times is taken, there is almost no change, so the difference is small. In such a state, the altitude (atmospheric pressure) measurement mode interval is performed, for example, every hour in order to suppress power consumption.
And in B section, altitude and atmospheric pressure have changed remarkably. This section shows the state when boarding an aircraft. Here, the altitude (atmospheric pressure) measurement data measured last time is compared with the altitude (atmospheric pressure) measurement data measured this time to obtain a difference. If there is a sudden change in atmospheric pressure that is not possible due to a change in atmospheric pressure due to changes in natural weather, it can be seen that the aircraft has taken off. Therefore, in this case, since it is expected that the positioning data measured last time cannot be used (moving greatly), it is possible to grasp the self position and the current position of the GPS wristwatch 10 upon arrival. Get ready to do it. In other words, the altitude (atmospheric pressure) measurement interval is changed to be short so that the GPS satellite 15a or the like is quickly entered at the point of arrival. The measurement interval is, for example, 15 minutes. And, for example, measurement is performed at 15-minute intervals, altitude (atmospheric pressure) measurement data is acquired, and if the difference in altitude (atmospheric pressure) between the previous measurement and the current measurement changes significantly again, the aircraft descends, It is said that it was ready for landing.

Next, it moves to C section, the previous measurement data and this measurement data are compared, and when there is almost no difference, it is judged that it has landed, and it is judged that it is the environment which can receive a GPS satellite. Then, the GPS satellite is received, the position of the GPS wristwatch 10 is measured, and the positioning data is updated.
In the section D, the change in altitude (atmospheric pressure) measurement data is small, so the altitude (atmospheric pressure) measurement interval is again returned every hour.

Here, regarding the relationship between altitude and atmospheric pressure, specifically, for example, if the altitude is 0 m and the atmospheric pressure is 1013 hPa, the atmospheric pressure is 900 hPa at an altitude of 1,000 m, and the atmospheric pressure is about 800 hPa at an altitude of 2,000 m. is there.
In other words, if there is movement by aircraft, if the difference between the previous and current altitude (atmospheric pressure) measurement data is large, for example, if the altitude difference changes by 2,000 m (atmospheric pressure difference 200 hPa) or more, the current altitude measurement When the data is large (when the pressure is low), it is determined that there has been a takeoff by the aircraft. After this change, the altitude difference further changes by 2,000 m (atmospheric pressure difference 200 hPa) and the current altitude measurement data is small (atmospheric pressure) If it is large), it is determined that the aircraft is descending and ready for landing.

  Therefore, a comparison is made by comparing the previous and present data of this altitude (atmospheric pressure) measurement data, and the difference is found to be an altitude difference of 2,000 m (atmospheric pressure difference 200 hPa) or more. It is stored as a part of threshold information in the altitude (atmospheric pressure) threshold information storage unit 62. The series of data in FIG. 13 is stored as part of threshold information when executing the altitude (atmospheric pressure) measurement mode and the altitude (atmospheric pressure) measurement interval change mode, as will be described later.

  That is, in the present embodiment, as the threshold information stored in the altitude (atmospheric pressure) threshold information storage unit 62 shown in FIG. 6, for example, a change of an altitude difference of 2,000 m (atmospheric pressure difference 200 hPa) or more is set in advance. The altitude (atmospheric pressure) measurement data a 711 (for example, previous measurement data) and the altitude (atmospheric pressure) measurement data b 712 (for example, current measurement) measured by the pressure sensor 19 and stored in the altitude (atmospheric pressure) measurement data storage unit 71 of FIG. If the difference between the two data is an altitude difference of 2,000 m (atmospheric pressure difference 200 hPa) or more and the altitude (atmospheric pressure) measurement data b712 (for example, the current measurement data) is large, The environment is inside the aircraft (moving) (B section in Fig. 13). Next, the difference between the two data is an altitude difference of 2,000m (atmospheric pressure difference of 200hPa) or more. If the (atmospheric pressure) measurement data b712 (for example, measurement data for this time) becomes smaller, it is assumed that the vehicle has entered the landing state. If the difference between the two subsequent data is no longer changed (if there is no difference in altitude), GPS The external environment of the wristwatch 10 determines that the aircraft has landed.

Then, in ST1 of FIG. 8, the air movement detection program 56 of FIG. 5 is executed and started. In ST2, the measurement interval is counted by the counter, and it is determined whether it is the measurement timing. Counting is performed until the timing is reached, and when the altitude (atmospheric pressure) measurement timing is reached, the process proceeds to ST3 to execute the altitude (atmospheric pressure) measuring mode. Next, proceed to ST4 and compare the altitude (atmospheric pressure) data measured this time with the altitude (atmospheric pressure) data measured last time. If the difference is more than 2,000 m (at atmospheric pressure, about 200 hpa), move by aircraft As a result, the process proceeds to ST5. Then, the altitude (atmospheric pressure) interval changing mode 562 in FIG. 5 is executed, and the altitude (atmospheric pressure) measuring interval is normally set to, for example, every hour, but is shortened, for example, every 15 minutes. Compare the measurement data before and after the measurement. Then, the process proceeds to ST6, and it is determined whether or not the change in altitude (200 Pha at atmospheric pressure) of 2,000 m or more has been eliminated. The series of movements of ST3 to ST6 is performed when the aircraft movement detection program 56 is executed, and the detailed movement will be described later based on the schematic flow of FIGS.
If it is determined in ST6 that the change in altitude of 2,000 m or more (200 Pha in atmospheric pressure) has disappeared, the process proceeds to ST7 and the 4-satellite time correction mode is executed.

When the four-satellite time correction mode is executed, the GPS wristwatch 10 is greatly moved by the aircraft together with the user. In this case, in the one-satellite time adjustment mode in which the normal self-positioning position is known and the time is adjusted, the self-positioning position cannot be made known, and correction time data cannot be obtained. Therefore, the 4-satellite time correction mode is executed, signals from a plurality of GPS satellites 15a and the like are received, and their positions are measured and acquired. Details of the four-satellite time correction mode will be described later with reference to FIG.
When the 4-satellite time correction mode ends normally in ST8, the time display 16 of the time display device 47 of the GPS wristwatch 10 is corrected based on the RTC clock display data.

  If the process does not end normally in ST8, the process proceeds to ST9, and after repeating the 4-satellite time correction mode about 5 times, the process proceeds to ST10, and the manual display program 54 in FIG. Then, a message such as “Positioning not possible, move to the open sky and press the operation button” is displayed on the display 14 to notify the user. When the user moves to a position where the GPS satellite 15a and the like can be received according to the display, the user presses the operation button 17 to start the time correction mode selection program 51 of FIG. 5, and selects, for example, the four satellite time correction mode. The time correction mode execution program 52 in FIG. 5 can execute the 4-satellite time correction mode.

  If it is determined in ST4 that there is no change of 2,000 m or more, the time correction mode selection program 51 of FIG. 5 is operated, and the 1-satellite time correction mode reference data 612 of FIG. 6 is referred to. In the 1-satellite time correction mode reference data 612, the position of the GPS wristwatch 10 is measured and the positioning data is acquired and stored as the positioning data 721 in the positioning data storage unit 72 of FIG. 24 hours have passed when the altitude (atmospheric pressure) measurement data a711 and altitude (atmospheric pressure) measurement data b712 in the altitude (atmospheric pressure) measurement data storage unit 71, that is, when the difference between the previous altitude (atmospheric pressure) and the current altitude (atmospheric pressure) is not 2,000 m or more. It is instructed to select and execute one satellite time correction mode data 642 shown in FIG. Accordingly, in order to measure 24 hours, which is the timing for executing the normal one satellite time correction mode, the process proceeds to ST11 and the GPS reception timing counter is activated. Then, the process proceeds to ST12 and the GPS reception timing is measured by the GPS reception timing counter. Then, the process proceeds to ST13, where, for example, it is determined whether or not 24 hours have elapsed. If 24 hours have elapsed, one satellite time correction mode is executed in ST14. This reception timing is set at the time of going to work in the morning or returning home in the evening to be in the outdoors to increase the reception probability, or at night when the GPS wristwatch 10 is removed from the arm and placed at the window. Details of the one-satellite time correction mode will be described later with reference to FIG.

Then, the process proceeds to ST15, where it is determined whether or not the 1-satellite time correction mode has been completed normally. Then, as usual, for example, the passage of 24 hours is counted, and the altitude (atmospheric pressure) measurement mode 561 is executed by executing the air movement detection program 56. Accordingly, although the process is terminated in FIG. 8, the operation is actually repeated from ST1. The count of the elapsed time of 24 hours, which is a condition for executing this one-satellite time adjustment mode, forms part of the one-satellite time adjustment mode reference data 612 when selecting the one-satellite time adjustment mode, It is instructed to select and execute one satellite time correction mode data 642 in FIG. 6 after 24 hours have elapsed.
Further, in ST15, when it does not end normally, the process proceeds to ST10, and the user is notified in the same manner as described above. For example, the user can also correct the self-position information or the time difference of the time display unit by a manual operation using the operation buttons 17.

Next, the air movement detection program 56 is executed in ST1 of FIG. 8, and details of execution of the altitude (atmospheric pressure) measurement mode 561 and execution of the altitude (atmospheric pressure) measurement interval change mode 562 will be described with reference to FIGS. . Here, FIG. 9 and FIG. 10 are a series of flows.
The air movement detection program 56 is executed in ST1 in FIG. 8, the measurement timing is determined in ST2, the altitude (atmospheric pressure) measurement mode is executed in ST3, the process proceeds to ST31 in FIG. 9, and the air movement detection program 56 in FIG. The altitude (atmospheric pressure) measurement mode 561 is executed. Next, proceeding to ST32, the voltage generated by the piezoelectric effect of the piezoelectric element of the pressure sensor 19 is digitally processed by the A / D converter to obtain the atmospheric pressure data, and the altitude data is obtained from the obtained atmospheric pressure data. The relationship between altitude and atmospheric pressure is calculated using, for example, the above-described relationship, assuming that the altitude is 0 m and the atmospheric pressure is 1013 hPa, the altitude is 1,000 m, the atmospheric pressure is 900 hPa, and the altitude is 2,000 m, the atmospheric pressure is about 800 hPa. The
Next, the process proceeds to ST33, and the obtained altitude data (atmospheric pressure data) is stored as, for example, altitude (atmospheric pressure) measurement data a711 in the altitude (atmospheric pressure) measurement data storage unit 71 of FIG.

Then, the process proceeds to ST34, where the time is measured by, for example, the built-in clock (for example, RTC38) of the GPS wristwatch 10 from the measurement and acquisition timing of altitude (atmospheric pressure) data, and it is determined whether or not one hour has passed. If one hour has passed, altitude data (atmospheric pressure data) is acquired in ST35, and the acquired data is stored in ST36. A series of operations of ST35 and ST36 are the same as ST32 and ST33 described above, except that the obtained altitude data (atmospheric pressure data) is converted into, for example, altitude (atmospheric pressure) measurement data storage unit 71 of FIG. (Atmospheric pressure) measurement data b712.
That is, in the operations from ST32 to ST36, the altitude (atmospheric pressure) data is two times of altitude (atmospheric pressure) measurement data a711 that is the previous (one hour ago) measurement data and altitude (atmospheric pressure) measurement data b712 that is the current measurement data. Is stored in the altitude (atmospheric pressure) measurement data storage unit 71.

  Next, in ST37, the altitude (atmospheric pressure) measurement data a711 that is the previous (one hour ago) measurement data and the altitude (atmospheric pressure) measurement data b712 that is the current measurement data are compared, and a difference is obtained. In ST38, this difference is compared with threshold information in the altitude (atmospheric pressure) threshold information storage unit 62 in FIG. That is, it is determined whether or not there is a change of an altitude difference of 2,000 m (atmospheric pressure difference of 200 hPa) or more. When there is a change of altitude difference of 2,000 m (atmospheric pressure difference 200 hPa) or more, the process proceeds to ST50, and altitude (atmospheric pressure) measurement interval change mode 562 in FIG. 5 is executed. Further, in this case, the process proceeds to ST11 in FIG. 8 described above, and one satellite time correction mode is executed in ST14.

Here, the 1-satellite time correction mode will be described with reference to FIG. FIG. 11 is a schematic flowchart showing the contents of “1 satellite time correction mode execution” in FIG.
Hereinafter, the contents of the one satellite time correction mode will be described with reference to FIG.
When the one-satellite time correction mode is executed in ST14 of FIG. 8, the process proceeds to ST151 of FIG. 11, and the GPS device 46 of FIG. 3 operates to scan the GPS satellite 15a and the like based on the self-location information and almanac information.
Hereinafter, signals transmitted from each GPS satellite 15a and the like will be described. FIG. 15 is a schematic explanatory diagram showing GPS satellite signals.
As shown in FIG. 15A, a signal is transmitted from each GPS satellite 15a and the like in units of one frame (30 seconds). This one frame has five subframes (one subframe is 6 seconds). Each subframe has 10 words (1 word is 0.6 seconds).

The first word of each subframe is a TLM word in which TLM (Telemetry word) data is stored. Preamble data is stored in the head of the TLM word as shown in FIG. 15B. Has been.
A word following the TLM is a HOW word in which HOW (Hand over word) data is stored, and GPS time information of a GPS satellite called TOW (Time of Week) is stored at the head thereof.
The GPS time is displayed in seconds since 0:00 every Sunday, and returns to 0 at 0:00 on the next Sunday. And since the week number of GPS is attached | subjected about this one week, it has the structure by which the receiving side can acquire GPS time by acquiring the data of a week number and elapsed time (second). The starting point of this GPS time is UTC (at the time of global agreement).

In order to acquire such frame data of the GPS satellite 15a and the like, it is necessary for the receiving side to synchronize with the signal of the GPS satellite 15a and the like. In particular, the C / A code (1023chip (1023chip ( 1 ms)) is used.
Since signals from the GPS satellites 15a and the like are transmitted as described above, in this embodiment, in ST152 of FIG. 11, it is determined whether or not one or more GPS satellites 15a and the like have been successfully captured, As shown in ST153, the C / A code from the captured GPS satellite 15a or the like is synchronized, the preamble or TOW in FIG. 15B is synchronized, and the ephemeris information of the GPS satellite 15a or the like is acquired.

Next, in ST154, the position information on the orbit of the captured GPS satellite 15a or the like is acquired from the ephemeris information, and a result of receiving signals from a plurality of GPS satellites 15a or the like from the positioning data 721 of FIG. For example, in the initial stage, the self-position of the GPS wristwatch 10 that is a positioning result obtained in the four-satellite time correction mode is acquired.
Then, the true propagation delay time (satellite distance) of the signal from the GPS satellite 15a or the like is obtained by calculation. On the other hand, the propagation delay time of the signal actually received from the GPS satellite 15a or the like is acquired using the RTC 38.
Thus, the actual propagation delay time and the true propagation delay time can be acquired.

  Next, in ST155, the time correction mode execution program 52 uses the difference data between the true propagation delay time acquired in ST154 and the actual propagation delay time measured by the RTC 38 as the correction time data 731. It is stored in the time data storage unit 73.

Thereafter, in ST156, the real time clock (RTC) offset program 53 in FIG. 5 offsets (corrects) the time of the RTC 38 based on the correction time data 731.
In ST157, the time display of the time display unit 16 of the time display device 47 of the GPS wristwatch 10 of FIG. 1 is corrected based on the RTC clock display data 742 including UTC data acquired from the satellite.
This is the end of the one satellite time correction mode.

Normally, an RTC 38 such as a GPS wristwatch 10 has an error with the passage of time. Therefore, in order to always use the accurate time, it is necessary to correct the error of the time after about 24 hours.
If this time error correction is performed every time in the 4-satellite time correction mode as shown in ST7 of FIG. 8, the power consumption becomes large, and in particular, a device such as a wristwatch that requires ultra-low power is a heavy burden. . Therefore, in the present embodiment, based on the altitude information, the time is normally adjusted in the one-satellite time adjustment mode described above, and if it is determined that the aircraft or the like has moved based on the altitude information, one satellite In a situation where the time correction mode cannot be performed, and when the time correction cannot be performed using the positioning data 721 stored in the positioning data storage unit 72, the four-satellite time correction mode is executed.

This is focused on when the position of the GPS wristwatch 10 is already known, and one GPS satellite 15a or the like is not captured using the position information (positioning data 721 in FIG. 7). The GPS satellite 15a or the like is used to correct the time. Therefore, normally, when there is no change in the location, the difference between the previous altitude (atmospheric pressure) measurement data and the current altitude (atmospheric pressure) measurement data is the altitude difference 2, which is data in the altitude (atmospheric pressure) threshold information storage unit 62. When the position of the GPS wristwatch 10 is not changed when the pressure is equal to or less than 000 m (atmospheric pressure difference 200 hPa), the time is corrected by executing such a one-satellite time correction mode.
That is, in the 1-satellite time correction mode, since the position of the GPS wristwatch 10 is already known, the position of one GPS satellite 15a and the like can be acquired and signals and data can be received. The true propagation delay time between the GPS wristwatch 10 can be calculated. Also, the RTC 38 can acquire the actually measured propagation delay time by receiving the time information (TOW), and the difference data is used as the correction time data 731, thereby correcting the four-satellite time correction in ST7 described above. The time can be adjusted with high accuracy similar to the mode.

Moreover, in the 1-satellite time adjustment mode, it is sufficient to capture one GPS satellite 15a and the like and receive data, so that power consumption can be greatly reduced compared to capturing four GPS satellites 15a and the like. It becomes.
Then, as in the present embodiment, the combination of the 4-satellite time correction mode and the 1-satellite time correction mode is determined by changing the altitude (atmospheric pressure) measurement data a711 and altitude (atmospheric pressure) in the altitude (atmospheric pressure) measurement data storage unit 71 as altitude information. ) Based on the difference data of the measurement data b712 and the threshold information of the altitude (atmospheric pressure) threshold information storage unit 62, the receivable state of the GPS satellite 15a and the like is determined by appropriately changing the altitude (atmospheric pressure) measurement data interval. It is also possible to reduce power consumption while maintaining time correction with high accuracy.

Note that the 1-satellite time correction mode data 642 in FIG. 6 uses the positioning data 721 in the positioning data storage unit 72 and the correction time data 731 based on signals from a single (1) GPS satellite 15a or the like. This is an example of single-satellite reference time correction basic information, which is basic information for generation.
Further, as described above, the 1-satellite time correction mode data 642 uses the positioning data 721 of the GPS wristwatch 10 as positioning information as the current position, and from this current position and orbit information (ephemeris) such as the GPS satellite 15a. Basic information for generating a propagation delay time obtained by calculation based on the satellite distance specified by the position information of the specified GPS satellite 15a and the like, and a propagation delay time that is a measurement value measured by the RTC 38 It is an example.
Moreover, ST14 of FIG. 8 which demonstrated a series of operation | movement in FIG. 11 is also an example of a 2nd time correction information generation process and a 2nd time information correction process.
The positioning data 721 in the positioning data storage unit 72 is positioning information when a plurality of satellites have been previously captured, that is, the time is corrected in the four-satellite time correction mode. Next, it is determined that the location has changed based on the altitude information, and the positioning data 721 is rewritten with the positioning data obtained when the four-satellite time correction mode is selected and executed, and the correction time data 731 is generated. .

Next, returning to FIG. 9 again, as described above, assuming that there is an altitude difference change of 2,000 m or more (atmospheric pressure difference change of 200 hPa or more) at ST38, the process proceeds to ST50 and the altitude (atmospheric pressure) measurement of FIG. The interval change mode 562 is executed. Next, the process proceeds to ST51 in FIG. 10, and the altitude (atmospheric pressure) measurement interval is shortened from 1 hour to 15 minutes.
As described above with reference to FIG. 13, the altitude (atmospheric pressure) measurement data measured last time is compared with the altitude (atmospheric pressure) measurement data measured this time, and the difference in altitude is not less than 2,000 m. If there is a change, the aircraft has taken off. That is, the positioning data 721 stored in the positioning data storage unit 72 after the previous positioning cannot be used. This state is predicted to be a case where the location of the GPS wristwatch 10 has moved greatly. Therefore, next, when it is determined that a significant altitude change has occurred again and arrived, it is necessary to prepare to select and execute the 4-satellite time adjustment mode.

That is, it is necessary to shorten the altitude (atmospheric pressure) measurement interval so that the GPS satellite 15a and the like can be quickly entered at the landing point.
That is, the measurement interval is set to 15 minutes, for example, so that the GPS satellite 15a and the like can be quickly entered at the landing point. In this way, if the interval is shortened, when a significant altitude change occurs again, the landing state can be determined, the GPS satellite 15a, etc. can be captured, the position of itself is measured, and time difference information is acquired. At the same time, the time can be corrected immediately, which is convenient for the user. And accurate time correction can be performed. In addition, since the 4-satellite time adjustment mode is executed only when necessary, power consumption can be reduced.

Therefore, in ST51, the altitude (atmospheric pressure) measurement interval is normally shortened from 15 minutes to 15 minutes. Next, the process proceeds to ST52 and ST53, and altitude (atmospheric pressure) data is acquired and stored. This process is the same as ST32 and ST33 described above. And it progresses to ST54 and measures progress for 15 minutes. This measurement method may also be the same as in ST34 described above.
Next, the process proceeds to ST55 and ST56, and altitude (atmospheric pressure) data is acquired and stored. This process is the same as ST35 and ST36 described above, and the next ST57 is the same as ST37 described above. That is, ST52 to ST57 are the same as ST32 to ST37 described above, except that only the measurement interval of ST54 is set to 1 hour for ST34 and 15 minutes for ST54.

Then, the process proceeds to ST58, the difference is taken in ST57, and the altitude (atmospheric pressure) threshold information storage unit 62 threshold information, that is, the altitude (atmospheric pressure) change after the altitude difference of 2,000 m (atmospheric pressure difference 200 hPa) or more is changed. It is determined whether or not there is no more. This determines whether or not the section B is moved to the section C after passing through the section B in FIG. That is, in the B section, the altitude information, which is the difference in altitude (atmospheric pressure) measurement data, significantly changes during landing, and the change decreases in the C section. Therefore, in the case of section C, it is possible to capture the GPS satellite 15a and the like as having landed.
In ST59, the altitude (atmospheric pressure) measurement interval is returned to the normal one hour. Thereby, power consumption is reduced. Then, in ST60, the process returns to ST31, and altitude (atmospheric pressure) measurement is continuously performed to prepare for a situation in which the location of the GPS wristwatch 10 changes again and for aircraft movement.
Also, after ST59, the process returns to ST7 of FIG. 8 at ST61 to execute the 4-satellite time correction mode.

In this case, the time correction mode selection program 51 of FIG. 5 operates. The time correction mode selection program 51 refers to the data in the time correction mode selection reference data storage unit 61 shown in FIG. 6 and selects the data in the time correction mode data storage unit 64 of FIG. Specifically, the 4-satellite time correction mode reference data 611 in FIG. 6 is altitude information, which is altitude (atmospheric pressure) measurement data a711 and altitude (atmospheric pressure) measurement in the altitude (atmospheric pressure) measurement data storage unit 71 in FIG. The altitude (atmospheric pressure) measurement data b712, which is the altitude (atmospheric pressure) measurement data of this time, is not changed after the difference in the data b712 is an altitude difference of 2,000 m or more. When the altitude is lower than the altitude (atmospheric pressure) measurement data a711 that is altitude (atmospheric pressure) measurement data (when the atmospheric pressure is high), the data indicates that the 4-satellite time correction mode is selected.
Then, the time adjustment mode selection program 51 selects the 4-satellite time adjustment mode data 641 in FIG.

The time correction mode selection program 51 is an example of a time correction information generation unit that generates time correction information to be described later based on time correction basic information (for example, 4-satellite time correction mode data 641).
The time correction mode data storage unit 64 stores time correction basic information (for example, 4-satellite time correction mode data 641) that is basic information for generating time correction information to be described later. It is an example.

  Then, as described above, the process proceeds to ST7 in FIG. 8, where the 4-satellite time correction mode is executed. Specifically, the time-correction mode execution program 52 in FIG. 641 is executed. FIG. 12 is a schematic flowchart showing the contents of “4 satellite time correction mode execution” in ST7 of FIG. Hereinafter, the 4-satellite time correction mode will be described with reference to FIG.

First, as shown in ST91 of FIG. 12, the GPS satellite 15a and the like are scanned based on the almanac information. Specifically, the GPS device 46 of FIG. 3 operates, receives a GPS satellite signal from the antenna 11, and searches for a GPS satellite 15a that can be captured.
Next, when it is possible to capture four or more GPS satellites 15a, etc. in ST92, the process proceeds to ST93, and when it is not possible to capture, it is assumed that the environment is such that indoor GPS satellites 15a, etc. cannot be captured. 4 Satellite time correction mode is complete | finished.

Since signals from the GPS satellites 15a and the like are transmitted as described above with reference to FIG. 15, in this embodiment, as shown in ST93 of FIG. 12, the C / A code from each GPS satellite 15a and the like The phase is synchronized, and the TLM word preamble and the HOW word TOW are synchronized as shown in FIG. Then, as shown in FIG. 15 (a), data of each subframe, for example, ephemeris information (detailed orbit information for each GPS satellite 15a etc.), almanac information (rough orbit information of all GPS satellites 15a etc.), Obtain UTC data (at the time of global agreement). The GPS wristwatch 10 acquires ephemeris information of the four GPS satellites 15a and the like, and the propagation delay delay time of signals from these GPS satellites 15a and the like (the time until the GPS wristwatch 10 is reached from the GPS satellites). ) Is measured using its own RTC 38 or the like, and the pseudo-satellite distance between the GPS satellite 15a or the like and the GPS wristwatch 10 is calculated based on the speed of light. Based on the pseudo-satellite distance from the four GPS satellites 15a and the like, the position, altitude, etc. of the GPS wristwatch 10 are calculated by simultaneous equations, and the positioning position of the GPS wristwatch 10 is obtained.
Thereby, the self-positioning position of the GPS wristwatch 10 can be acquired in ST93.

  Next, in ST94, the own positioning position is stored as positioning data 721 in the positioning data storage unit 72 of FIG.

Next, in ST95, the positioning data / time difference information data table comparison program 55 of FIG. 5 is executed, and the regional time difference information data table 631 stored in the regional time difference information data table storage unit 63 of FIG. The positioning data 721 stored in the positioning data storage unit 72 obtained in the above is compared, the time difference information at the current position (location) of the GPS wristwatch 10 is read, and the time difference information is stored in the time difference information data storage unit 75 of FIG. Store as data 751.
Here, the regional time difference information data table 631 stored in the regional time difference information data table storage unit 63 in FIG. 6 includes, for example, as shown in FIG. 14, regional information, time difference information between the standard time in Japan, and UTC. This is the time difference information. As described above, since the area information and the time difference information are stored in relation to each other, the time difference can be acquired together with the own positioning position. For example, the time difference information can be easily acquired even when the GPS wristwatch 10 is set in advance in Japan time.

Then, proceeding to ST96, the RTC offset program 53 of FIG. 5 operates to read the RTC time data 741 of the RTC time data storage unit 74 of FIG. 7, and the time difference information data of the time difference information data storage unit 75 obtained in ST95. 751 is reflected, and the RTC time data 741 in the RTC time data storage unit 74 is offset (corrected).
Thus, the time difference information data storage unit 75 is an example of a time correction information storage unit that stores time correction information (for example, time difference information data 751) for correcting RTC time information (for example, RTC time data 741). .
Then, as described above, the time difference information data 751 is time difference information at the location of the GPS wristwatch 10 by comparing the positioning data 721 and the time difference information data table 631 and reading out the time difference information in the corresponding area. Yes. The RTC offset program 53 is an example of a time information correction unit that corrects the RTC time data 741 by reflecting the time difference information 751 of FIG. 7 which is time difference information in this region.

  As shown in ST97, the display of the time display unit 16 of the time display device 47 is corrected based on the RTC clock display data 742 of FIG. 6 reflecting the time difference information. Therefore, even when the time zone moves so much that the time difference changes, the time considering the location of the GPS wristwatch 10 is displayed.

This completes the four-satellite time correction mode. As described above, the 4-satellite time correction mode data 641 in FIG. 6 receives signals from a plurality of GPS satellites 15a and the like, and based on the positioning data 721 obtained by positioning its own position, the location of the GPS wristwatch 10 is determined. This is an example of the multiple satellite reference time correction basic information reflecting the time difference information which is the time difference information data 751.
The series of operations described in FIG. 12 and ST7 in FIG. 8 are an example of a first time correction information generation step and a first time information correction step.

Thus, ST7 in FIG. 8 is completed. Then, as described above, the process proceeds to ST8, where it is determined whether or not the 4-satellite time adjustment mode has been completed normally. If it has not been completed normally after repeating several times, the time correction by manual operation is performed in ST10. The point to be displayed is as described above.
In the present embodiment, for example, a data table of regional information and time difference information is stored in the GPS wristwatch 10 from the captured self-position, and the data table is compared with the self-position and moved. It is more convenient for the user if time difference information in a later area can be acquired and the time difference information can be reflected in the correction time data.

Then, based on altitude information (altitude (atmospheric pressure) measurement data 711 and 712), the 4-satellite time correction mode and the 1-satellite time correction mode are selected, and normally, the 1-satellite time correction mode is executed every 24 hours. . Accordingly, power consumption can be reduced, and in the 1-satellite time adjustment mode, data acquired in the 4-satellite time adjustment mode is used, so that highly accurate time adjustment can be maintained.
The altitude information (altitude (atmospheric pressure) measurement data 711 and 712) can be used to correct the time while reflecting the time difference information of the location area, even when the GPS wristwatch 10 changes the location greatly. The measurement interval of altitude information (altitude (atmospheric pressure) measurement data 711, 712) is also adjusted by altitude information (altitude (atmospheric pressure) measurement data 711, 712), so that power consumption can be reduced.

  The present invention is not limited to the above-described embodiment. For example, although the shift to the 4-satellite time correction mode is a change of altitude of 2,000 m or more, if it is desired to eliminate the operation when the aircraft moves in the country, a higher altitude setting may be used.

It is the schematic which shows the wristwatch with a GPS time adjustment apparatus which is the electronic timepiece with a time adjustment apparatus which concerns on this invention, for example. It is a cross-sectional end schematic diagram of the wristwatch with a GPS time correction device of FIG. It is the schematic which shows the main hardware constitutions etc. of the wristwatch with a GPS time correction apparatus of FIG.1 and FIG.2. It is a schematic whole figure showing main software composition etc. of a wristwatch with a GPS time correction device. It is the schematic which shows the data in the various program storage part of FIG. It is the schematic which shows the data in the 1st various data storage part of FIG. It is the schematic which shows the data in the 2nd various data storage part of FIG. It is a schematic flowchart which shows main operation | movement etc. of the wristwatch with a GPS time correction apparatus concerning this Embodiment. It is a schematic flowchart which shows the main operation | movement etc. of the altitude (atmospheric pressure) measurement mode and altitude (atmospheric pressure) measurement interval change mode of the air movement detection program of FIG. It is a schematic flowchart which shows the main operation | movement etc. of the altitude (atmospheric pressure) measurement mode and altitude (atmospheric pressure) measurement interval change mode of the air movement detection program of FIG. It is a schematic flowchart which shows the content of "1 satellite time correction mode execution" of ST14 of FIG. It is a schematic flowchart which shows the content of "4 satellite time correction mode execution" of ST7 of FIG. It is a graph which shows the altitude / time relationship converted from the atmospheric | air pressure of the external environment of the wristwatch with a GPS time correction apparatus at the time of moving by an aircraft etc. using a pressure sensor. It is an example which shows a regional time difference information data table. It is a schematic explanatory drawing which shows a GPS satellite signal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Wristwatch with GPS time correction device, 15a to 15d ... GPS satellite, 16 ... Time display unit, 17 ... Operation button, 19 ... Pressure sensor, 23 ... Control unit, 38 ... real time clock (RTC), 45 ... air movement detection device, 46 ... GPS device, 50 ... various program storage units, 51 ... time correction mode selection program, 52 ... time Correction mode execution program, 53 ... RTC offset program, 54 ... Manual display program, 55 ... Positioning data / time difference information data table comparison program, 56 ... Air movement detection program, 561 ... Altitude (Atmospheric pressure) measurement mode, 562... Altitude (atmospheric pressure) measurement interval change mode, 60... First various data storage unit, 61. Mode selection reference data storage unit, 611... 4 satellite time correction mode reference data, 612... 1 satellite time correction mode reference data, 62... Altitude (atmospheric pressure) threshold information storage unit, 63. Time difference information data table storage unit, 631 ... Regional time difference information data table, 64 ... Time correction mode data storage unit, 641 ... 4 satellite time correction mode data, 642 ... 1 satellite time correction mode data, 70 ... second various data storage unit, 71 ... altitude (atmospheric pressure) measurement data storage unit, 711 ... altitude (atmospheric pressure) measurement data a, 712 ... altitude (atmospheric pressure) measurement data b, 72 ... positioning data storage unit, 721 ... positioning data, 73 ... correction time data storage unit, 731 ... correction time data, 74 ... RTC time data storage unit, 741 ... TC time data, 742 ··· RTC for timepiece display data, 75 ... time difference information data storage unit, 751 ... time difference information data

Claims (7)

A positioning unit that receives a signal from a position information satellite orbiting the earth and performs positioning;
A time correction information storage unit for storing time correction information for correcting the time information of the time information generation unit for generating time information;
A time information correction unit that corrects the time information based on the time correction information;
An altitude information acquisition unit that acquires altitude information of the positioning unit at predetermined intervals;
An altitude information storage unit for storing the altitude information;
Altitude information acquisition unit based on the altitude information, an altitude information acquisition interval changing unit for changing the interval for acquiring the altitude information,
A time correction device having
A time correction basic information storage unit for storing time correction basic information which is basic information for generating the time correction information;
A time correction information generating unit that generates the time correction information based on the time correction basic information, and
In the time correction basic information,
A plurality of satellite reference time correction basic information which is the basic information for generating the time correction information based on signals from a plurality of the position information satellites;
Based on the plurality of satellite reference time correction basic information, using the positioning information obtained when the time correction information generation unit generates the time correction information, based on a signal from a single position information satellite Singular satellite reference time correction basic information, which is the basic information for generating time correction information, and
Among the time correction basic information, the multiple satellite reference time correction basic information and the single satellite reference time correction basic information are the altitude information acquired previously stored in the altitude information storage unit and the altitude acquired this time. A time correction apparatus that performs a receiving operation that is selected based on a comparison result of information and receives a signal from the position information satellite.   The time correction apparatus according to claim 1, wherein the altitude information acquisition unit includes a pressure sensor that measures an atmospheric pressure of an external environment of the positioning unit. The altitude information storage unit stores the altitude information for at least two times of the altitude information acquired last time by the altitude information acquisition unit and the altitude information acquired this time.
The altitude information acquisition interval changing unit compares the difference between the altitude information for the two times and altitude threshold information in the altitude threshold information storage unit, and changes the interval at which the altitude information acquiring unit acquires the altitude information. The time correction apparatus according to claim 2. The time correction device has a regional time difference information storage unit that stores time difference information in regional information,
The plurality of position information satellites are four GPS (Global Positioning System) satellites,
The multiple satellite reference time correction basic information is:
The positioning position information of the time correction device obtained by calculation on the basis of the propagation delay time actually measured until signals transmitted from the four GPS satellites are received, and the positioning position information corresponding to the positioning position information It is the basic information for acquiring and generating the time difference information in regional information,
The time correction apparatus according to claim 3, wherein the time correction information is generated by reflecting the time difference information. The single satellite reference time correction basic information uses the position information of the time correction device, which is the positioning information, as a pseudo current position, and the position of the GPS satellite specified from the pseudo current position and the orbit information of the GPS satellite. The true propagation delay time obtained by calculation based on the pseudo-satellite distance specified by the information, and
The time correction apparatus according to claim 4, wherein the time correction apparatus is the basic information for generating the propagation delay time that is a measurement value measured by the time information generation unit. A positioning unit that receives a signal from a position information satellite orbiting the earth and performs positioning;
A time correction information storage unit for storing time correction information for correcting the time information of the time information generation unit for generating time information;
A time information correction unit that corrects the time information based on the time correction information;
An altitude information acquisition unit that acquires altitude information of the positioning unit at predetermined intervals;
An altitude information storage unit for storing the altitude information;
Altitude information acquisition unit based on the altitude information, an altitude information acquisition interval changing unit for changing the interval for acquiring the altitude information,
An electronic timepiece with a time correction device,
A time correction basic information storage unit for storing time correction basic information which is basic information for generating the time correction information;
A time correction information generating unit that generates the time correction information based on the time correction basic information, and
In the time correction basic information,
A plurality of satellite reference time correction basic information which is the basic information for generating the time correction information based on signals from a plurality of the position information satellites;
Based on the plurality of satellite reference time correction basic information, using the positioning information obtained when the time correction information generation unit generates the time correction information, based on a signal from a single position information satellite Singular satellite reference time correction basic information, which is the basic information for generating time correction information, and
Among the time correction basic information, the multiple satellite reference time correction basic information and the single satellite reference time correction basic information are the altitude information acquired previously stored in the altitude information storage unit and the altitude acquired this time. A selection information storage unit for storing selection information to be selected and executed based on a comparison result of information and a time display means,
An electronic timepiece with a time adjustment device, wherein a reception operation for receiving a signal from the position information satellite is executed.   A positioning process that performs positioning by receiving a signal from a position information satellite orbiting the earth;
  Stores time correction information for correcting the time information of a time information generation unit that generates time information.
Time correction information storage step;
  A time information correction step of correcting the time information based on the time correction information;
  Altitude information acquisition step of acquiring altitude information of a positioning unit that performs the positioning at predetermined intervals;
  An altitude information storing step for storing the altitude information;
  Altitude information acquisition interval changing step for changing the interval for acquiring the altitude information based on the altitude information,
  A time correction method comprising:
  A time correction basic information storage step for storing time correction basic information which is basic information for generating the time correction information;
  A time correction information generating step for generating the time correction information based on the time correction basic information, and
  In the time correction basic information,
  A plurality of satellite reference time correction basic information which is the basic information for generating the time correction information based on signals from a plurality of the position information satellites;
  Based on the multiple satellite reference time correction basic information, using the positioning information obtained when generating the time correction information in the time correction information generation step, based on a signal from a single position information satellite Singular satellite reference time correction basic information, which is the basic information for generating time correction information, and
  Among the time correction basic information, the multiple satellite reference time correction basic information and the single satellite reference time correction basic information are the altitude information acquired previously and the altitude information acquired this time stored in the altitude information storage step. The time correction method is characterized in that a reception operation for receiving a signal from the position information satellite selected based on the comparison result is executed.

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