JP2000136941A - Receiving device, and system for correcting information on present location - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a receiving device which usefulness improved through the use of GPS information and standard radio waves. SOLUTION: After acquiring the latitude and longitude of the present location (step SC1), the distance to a radio wave station is computed (step SC3). On the basis of the computed distance and the retrieved transmission output of the radio wave station, it is judged whether standard waves from the radio wave station can be received or not (step SC4). In the case when the standard radio waves can not be received, a receiving circuit 16 is turned off (step SC5). In the case where the distance enables the reception of the radio waves, the receiving circuit 16 is turned on (step SC10). The frequency of the radio wave station is sequentially read (step SC11), and the read frequency is set in the receiving circuit 16. By this, it is possible for the receiving circuit 16 to start receiving the standard waves from the closest radio wave station and acquire term code included in the standard radio waves (step SC13).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver having a function of a so-called radio-controlled timepiece and a function of acquiring a current position, and a current position information correction system.

[0002]

2. Description of the Related Art Conventionally, a GPS device has been known as a device for detecting a current position and displaying the current position. This GPS
The device includes a GPS module, a map data storage unit and a display unit.
Acquire latitude / longitude data of the current position based on the information.
Then, a map based on the map data is displayed on the display unit, and the current position based on the latitude / longitude data of the current position is displayed on the map.

On the other hand, at present, in each country (eg, Germany, United Kingdom, United States, Japan, etc.), a time code, that is, a long-wave standard radio wave containing a time code is transmitted from a radio station provided at a predetermined location. In Japan, JG2AS
(Experimental station) transmits a long-wave standard radio wave of 40 KHz amplitude-modulated by the time code of the format shown in FIG. This time code is sent in a format of one minute each time the minute digit of the correct time is updated (that is, every minute, in the example shown, 153 days, 15:42). . Therefore, a radio timepiece provided with a receiving circuit for receiving the time code and correcting the current time data counted by the built-in time counting circuit has been put to practical use.

[0004]

However, at present, there is only the radio wave clock that uses the standard radio wave transmitted from the radio station, and the standard radio wave has been sufficiently utilized. There is no fact.
On the other hand, a GPS device operates only depending on GPS information. Here, the GPS information is originally intended for military purposes but is diverted to civilian use. Contains error information intentionally.
Therefore, the latitude / longitude data of the current position based on the private GPS information necessarily includes an error. Therefore, there is an error between the current position display based on the latitude / longitude data and the actual current position. For example, a GPS device that operates only depending on GPS information, for example, may have an accuracy limit or an operation limit.

The present invention has been made in view of such a conventional situation, and an object of the present invention is to provide a receiving apparatus and a current position information correction system which have improved usability using GPS information and standard radio waves.

[0006]

According to the first aspect of the present invention, there is provided a receiving means for receiving a standard radio wave transmitted from a radio station (the receiving circuit 16 in FIG. 1).
Map data storage means (map storage means 9 in FIG. 1) for storing map data, and map data read out from the map data storage means based on the standard time signal received by the reception means for display. Control means (CPU 4 in FIG. 1; SB 14 in FIG. 7). Therefore, a map can be displayed without acquiring GPS information.

According to the invention of claim 2, there is further provided a local data storage means (a local specification register 6g in FIG. 4) for storing pre-specified local data, and wherein the control means comprises the standard radio wave. And the regional data,
The corresponding map data is read and provided for display. Therefore, a more detailed map can be displayed without acquiring GPS information.

According to the third aspect of the present invention, a receiving means for receiving a standard radio wave transmitted from a radio station (FIG. 1)
Receiving circuit 16), position information obtaining means (GPS module 2 in FIG. 1) for obtaining current position information, and the current position information obtained by the position information obtaining means A correction unit (CPU 4 in FIG. 1; SB15 in FIG. 7) for correcting based on the standard radio wave is provided. Therefore, an intentional error included in the current position information can be corrected, and highly accurate current position detection can be performed.

According to the fourth aspect of the present invention, the display means (the monitor 12 in FIG. 1), the map data storage means for storing the map data (the map storage section 9 in FIG. 1), Control means for reading map data from the map data storage means, displaying the map on the display means, and displaying the current position on the map based on the position information corrected by the correction means (CPU 4 in FIG. 1; FIG. 7 SB
16).

Therefore, the current position can be accurately displayed on the map without being influenced by an intentional error in the obtained current position information.

Further, in the invention according to claim 5, the control means reads corresponding map data from the map data storage means based on the standard radio wave received by the reception means (SB10 in FIG. 7). ). Therefore, a map can be displayed without depending on the current position information.

Further, according to the present invention, the position information acquisition means (SC in FIG. 9) for acquiring the current position information.
1), receiving means (receiving circuit 16 in FIG. 1) for receiving the standard radio wave transmitted from the radio station, and a receiving operation of the receiving means based on the current position information acquired by the position information acquiring means. Control means (CPU4 in FIG. 1; SC4, SC5, and SC10 in FIG. 9) for controlling are provided. Therefore, the receiving means does not always operate, and unnecessary operation of the receiving means is avoided.

[0013] In the invention according to claim 7, the control means determines whether or not the standard radio wave can be received based on the current position information (SC4 in FIG. 9).
When it is possible, the receiving means is operated (S in FIG. 9).
C10). Therefore, unnecessary operation of the receiving means is avoided, and unnecessary power consumption is also avoided.

Further, according to the present invention, there is further provided a display means (monitor 12 in FIG. 1), and when the control means determines that the standard radio wave cannot be received, it informs the user. It is displayed on the display means (SC6 in FIG. 9). Therefore, when the receiving means is stopped, it is not mistaken for a failure of the device.

According to the ninth aspect of the present invention, the control means sets a frequency of a receivable standard radio wave in the receiving means based on the current position information (S in FIG. 9).
C12). Therefore, for example, when moving between foreign countries, it is possible to automatically receive the standard radio wave of the arriving country.

Further, in the invention according to claim 10,
The display device further includes a display unit, and the control unit displays the current time on the display unit, and corrects the current time based on the standard time signal received by the reception unit (SC14 in FIG. 9). Therefore, when moving between foreign countries, etc., the time is automatically adjusted to the time of the country based on the standard radio wave of the arriving country.

Further, in the invention according to claim 11,
A standard radio wave transmitting means for transmitting a standard radio wave (radio station D in FIG. 1), a receiving means for receiving the standard radio wave transmitted from the standard radio wave transmitting means (a receiving circuit 16 in FIG. 1), and acquisition of current position information And the current position information (GP in FIG. 1) obtained by the position information obtaining means.
S module 2) is corrected based on the standard time signal received by the receiving means.
4; SB15 in FIG. 7).

Therefore, standard radio wave transmitting means (radio station)
, The intentional error included in the current position information can be corrected, and the current position can be detected with high accuracy.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing a case where the present invention is applied to an electronic timepiece with a GPS function. This G
The electronic timepiece T with a PS function is a wrist-type electronic device worn on the wrist of the user, and includes a GPS antenna 1 and a GPS
L1 band C / A from satellite G received by antenna 1
It has a GPS module 2 for demodulating and decoding the code to determine the latitude / longitude of the current position. The latitude / longitude information determined by the GPS module 2 is taken into the CPU 4 via the bus 3. The storage device 5 and the RAM 6 for storing various data necessary for the operation of the CPU 4 are connected to the CPU 4 via the bus 3.

The storage device 5 has a recording medium 14 in which programs, data and the like are stored in advance, and this recording medium 14 is constituted by a magnetic or optical recording medium or a semiconductor memory. The recording medium 14 is fixedly provided in the storage device 5 or is detachably mounted. Further, the program, data, and the like to be recorded on the recording medium 14 may be configured to be received and stored from another device connected via a communication line or the like.
A recording device having the recording medium 14 may be provided on another device connected via a communication line or the like, and a program and data stored in the recording medium may be used via the communication line. .

The bus 3 is connected to a graphic controller 7 and a CPU peripheral circuit G / A8.
A map storage unit 9 is connected to the CPU peripheral circuit G / A8. The CPU 4 constitutes the control means of the present invention in this embodiment, and includes a CPU peripheral circuit G / A8.
The map data and the like are read from the map storage unit 9 via the CPU 11, and a map and the like are displayed on the screen of the monitor 12 based on the map data and the image information stored in the video RAM 11. The CPU peripheral circuit G / A8 has various keys provided for operating the GPS device, and selectively selects a correction data creation mode and a current position display mode, a no map display mode and a world map display mode, which will be described later. And a key input unit 13 having various operation keys (not shown) such as a mode setting key for setting an image size and a scale setting key for enlarging or reducing a map displayed on the monitor 12. The map storage unit 9 constitutes the map data storage means of the present invention in this embodiment, and stores a world map, map data of each country in the world, and each region.

The antenna 15 receives a standard radio wave including a time code transmitted from the radio station D, and transmits it to the receiving circuit 16 as an electric signal corresponding thereto. The receiving circuit 16 operates in accordance with an instruction from the CPU 4, selects a signal having a specific frequency from the electric signals from the antenna 15, and sends the selected signal to the CPU 4 via the bus 3.

The oscillating circuit 17 always sends out a signal of a constant frequency, and the frequency dividing circuit 18 counts the signal from the oscillating circuit and counts a one-minute signal every time the counted value becomes a value corresponding to one minute. Each time the preset signal is sent to the numerical circuit 19, the count value is increased by one second every time a preset signal is received from the CPU 4, and the second digit data of the current time being counted is converted to a CP.
It is sent to U4. The clock counting circuit 19 counts the one-minute signal from the frequency dividing circuit 18 to obtain current time data, that is, date data of the current day and current time data and minute data, and provides these to the CPU 4.
4 is to correct the current time data counted by the time data from 4.

The recording medium 14 has a radio station table 20 shown in FIG. 2 and a sensitivity-distance correspondence table 21 shown in FIG.
Are stored. The radio station table 20 (FIG. 2) includes a transmission frequency area 21a, a transmission name area 21b, a country name area 21c, and an information area 21 corresponding to the address.
d and a position data area 21e are provided. The transmission frequency area 21a stores the transmission frequency of the standard radio wave including the time code transmitted from each radio station, and the transmission name area 21b stores the abbreviation of each radio station. The country name area 21c stores the country name and place name of the country where each radio station is located, and the information area 21d stores the type of information included in the radio station. Further, the position data area 21e stores the position data of each radio station in latitude and longitude.

The sensitivity-distance correspondence table 21 (FIG. 3) sets the receiving sensitivity when a standard radio wave from the radio station is received by the antenna 15 on the vertical axis y, and sets the horizontal axis x on the horizontal axis x. It consists of two-dimensional coordinate data in which a distance is set and a change characteristic A of the distance from the radio station according to the receiving sensitivity is stored in a coordinate plane. Therefore, if the reception sensitivity S is obtained as indicated by the dashed line, the distance data to the radio station is obtained by reading the corresponding distance data from the horizontal axis x in accordance with the change characteristic A. .

FIG. 4 is a diagram showing the contents of the RAM 6. The display register 6a stores data displayed on the monitor 12, and the reception sensitivity register 6b stores
The reception sensitivity of the standard radio wave from the radio station received at the step is stored. The current position data register 6c stores the latitude / longitude of the current position determined by the GPS module 2, that is, the current position data (X _N , Y _N ), and the calculated position data register 6d stores the standard radio wave as described later. The position data (X _D , Y _D ) calculated from the receiving sensitivity of the data is stored. The correction data register 6e stores correction data created in a correction data creation mode described later. In addition, the memory country register 6f stores the key input unit 13 in advance by the user.
The names of countries for which the user wants to display the map, such as "Japan", "USA", "Germany", etc., which have been input by the operation described in FIG.
In the area designation register 6g, for example, in the case of Japan, the names of areas for which a user wants to display a map, such as Hokkaido, Tohoku, and Kanto, are stored.

In this embodiment having the above-described configuration, when the power is turned on by operating the key input unit 13 and the correction data creation mode is set, the CPU 4 executes the recording medium in the form of a readable program code. The respective functions shown in the flowchart of FIG. 5 are realized based on the control program stored in. That is, the antenna 15
The standard radio wave received at is received from the receiving circuit 16 (step SA1).

Next, it is determined whether or not the standard radio wave has been properly received (step SA2). If the standard radio wave has been properly received, the radio station is determined (step SA3).

That is, the frequency of the received standard radio wave is searched in the transmission frequency area 21a of the radio station table 20, and the corresponding transmission name, country name and the like are read from the transmission name area 21b and the country name area 21c. At this time, for example, there are stations having the same frequency, such as radio stations stored at addresses 3 and 4, and 5 and 6, but in this case, for example, the time code of the standard radio wave shown in FIG. Time and C
The radio station may be determined by comparing the time of the world clock of the PU 4 with the time. When the radio station that has transmitted the received standard radio wave is determined, the position data of the determined radio station is read from the corresponding and position data area 21c (step SA4).

Further, the reception sensitivity is determined, and step S
The sensitivity S of the standard radio wave received at A1 is detected (step S
A5) Subsequently, as described above, the distance data D corresponding to the sensitivity S is read from the sensitivity-distance correspondence table 21 (step SA6).

Next, the C / A code in the L1 band from the satellite received by the GPS antenna 1 is demodulated and decoded, and
The latitude / longitude (current position data (X _N , Y _N )) of the current position determined by the module 2 is obtained (step SA)
7). Thereafter, both position data, that is, step SA
Based on the position data of the reference station read from the position data area 21c in step 4 and the current position data (X _N , Y _N ) obtained in step SA7, a straight line (direction) connecting the radio station and the current position is calculated ( Step SA8).

That is, assuming that the currently received standard radio wave is from the radio station in Ibaraki, Japan stored at address 2 in FIG. 2, in step SA4, the position data (X ₂ , Y ₂ ) has been read. Since the current position data (X _N , Y _N ) has been obtained in step SA7, as shown in FIG. 6A, in step SA8, the position data (X ₂ , Y ₂ ) of the radio station is obtained. A straight line L connecting the current position data (X _N , Y _N ) is calculated.

Next, on the calculated straight line L, position data (X _D ,
Y _D) for calculating a (step SA9). That is, the straight line L connecting the radio station and the current position is obtained by the processing in step SA8, and the distance from the current position to the radio station based on the reception sensitivity of the standard radio wave is obtained by the processing in step SA6. Since D has been obtained, in this step SA9, position data (X _D , Y _D ) which is a point at a distance D from the radio station on the straight line L is calculated.

Then, the calculated position data (X _D , Y _D ), which is a point at a distance D from the radio station, is compared with the current position data (X _N , Y _N ) determined by the GPS module 2 (step S1). SA10), it is determined whether or not the difference exists (step SA11). The result of this determination, as shown in FIG. 6 (A), both ((X _N, Y _N) and (X _D, Y _D)) a difference in the absence if indicated as on the monitor 12 "no error" (step SA12).

However, as shown in FIGS. 6B and 6C,
If there is a difference between the two ((X _N , Y _N ) and (X _D , Y _D )), the differences X _G = X _D −X _N , Y _G = Y _D −Y _N are calculated (step). SA13), the error (X _G ,
Y _G ) is displayed on the monitor 12 (step SA1).
4) The error (X _G , Y _G ) is used as correction data in the RAM
6 is stored in a predetermined area (step SA15).

Therefore, by the above processing, FIG.
As shown in (A), (X _N , Y _N ) = (X _D , Y _D ), and the current position data (X _N , Y _N ) determined by the GPS module 2 and the standard radio wave from the radio station If there is no difference from the current position data (X _D , Y _D ) calculated from the receiving sensitivity of the data, no correction data is generated and stored, and FIGS.
As shown in ( ₂ ), (X _N , Y _N ) 、 (X _D , Y _D ), and the reception of the current position data (X _N , Y _N ) determined by the GPS module 2 and the standard radio wave from the radio station If there is a difference from the current position data (X _D , Y _D ) determined from the sensitivity, correction data (X _G , Y _G ) is generated and stored.

When the processing in the correction data creation mode is completed as described above, the power is turned on as necessary, and the current position display mode is set. Then, the CPU 4 realizes each function shown in the flowchart of FIG. 7 based on the control program stored in the recording medium 14. That is, the standard radio wave received by the antenna 15 is fetched from the receiving circuit 16 (step SB1). Next, it is determined whether or not the standard radio wave has been properly received (Step S).
B2) If it is not received properly, the previous screen display processing is performed (step SB3), and the screen that was displayed when the power was last turned off is displayed.

If the standard radio wave is properly received, a received radio wave search process (step SB4) is performed to search for the frequency of the received standard radio wave in the transmission frequency area 21a of the radio station table 20. The receiving country is determined by reading the name of the country where the radio station is located from the country name area 21c (step SB5). At this time, as described above,
For a station having the same frequency, the time indicated by the time code of the standard radio wave and the time of the world clock provided in the CPU 4 may be compared to determine the radio station and the receiving country.

Next, it is determined whether or not the determined receiving country is a memory country (step SB6). Here, as described above, the memory country is a country in which the user desires to display a map registered in advance in the memory country register 6f. If the receiving country determined in step SB5 is not one of the memory countries, the map country is displayed. It is determined which of the non-display mode and the world map display mode is set (step SB7). If the no-map mode is set, normal display is executed (step SB).
8) The current time is displayed on the monitor 12, and if the world map display mode is set, the world map data is read from the map storage unit 9 and the world map is displayed on the monitor 12 (step SB9).

If the result of determination in step SB6 is that the receiving country is one of the memory countries, a map (map data) of the receiving country is called from the map storage unit 9 (step SB10), and then the above-mentioned process is performed. As in step SA7, G
C / C of L1 band from satellite received by PS antenna 1
Latitude / longitude (current position data (X _N ,
Y _N )) is obtained (step SB11). Further, it is determined whether or not there is an area designation, that is, whether or not the acquired current position data is stored in the area designation register 6g and belongs to any of the designated areas (step SB12). Displays on the monitor 12 a map of the whole country based on the map data read in step SB10 (step SB14).

However, if the current position belongs to any one of the region designations, a map (map data) of the designated region including the current position is substituted for the map of the receiving country called in step SB10 described above. (Step SB13), and displays a regional map based on the called map data on the monitor 12 (step SB14).

Next, the latitude / longitude of the current position acquired in step SB11 is corrected based on the correction data (X _G , Y _G ) stored in the correction data register (step SB15). That is, if the latitude and longitude of the current position is _{(X N, Y N),} X F = X N + X G, Y F = Y N
By calculating + Y _G , the corrected latitude / longitude (X _F , Y _F ) of the current position is obtained. Subsequently, the current position is displayed at a position corresponding to the corrected position data (X _F, Y _F ) on the map (step SB16).

Thereafter, the map displayed on the monitor 12 is enlarged or reduced according to the operation of the scale setting key provided on the key input section 13 (step SB1).
7) Display the map at the scale desired by the user and display the current position. As a result, the monitor 12 shown in FIG.
As shown in the example, along with the enlarged map M of Kanto,
A current position mark S indicating the current position is displayed on the map M. At this time, as described above, the current position mark S is displayed at a position corresponding to the corrected latitude / longitude (X _F , Y _F ) of the current position. Therefore, as shown in the figure, if the current position is displayed only with the latitude / longitude information from the GPS module 2, the actual position is displayed due to an intentional error in the GPS information or an unavoidable error due to the characteristics of the GPS module 2. Even if an error occurs between the current position P and the current position mark S ', the GPS according to the present embodiment
The apparatus can accurately display the current position mark S on the actual current position P as shown.

In this embodiment, as described above, the position data (X _D ,
Y _D ) and the difference between the current position data (X _N , Y _N ) determined by the GPS module 2 are used as correction data as they are. However, half of the difference is used as correction data, Generates according to the current position data determined by the GPS module 2 and the reception state of the standard radio wave from the radio station, such as receiving the standard radio wave from the radio station and using the average value of the difference at a plurality of locations as correction data. Any data may be used as the correction data as long as the data is obtained.

FIG. 9 shows another embodiment of the present invention. The CPU 4 executes each of the steps shown in this flowchart based on a control program stored in the recording medium 14 in the form of a readable program code. Implement the function. That is, the C / A code of the L1 band from the satellite received by the GPS antenna 1 is demodulated and decoded to obtain the latitude / longitude (current position data (X _N , Y _N )) of the current position determined by the GPS module 2. (Step SC
1). Next, the radio station closest to the current position is searched by referring to the position data of each radio station stored in the position data area 21c of the radio station table 20 shown in FIG. 2 (step SC2). Then, after calculating the distance to the radio station based on both data (step SC
3) Based on the calculated distance and the transmission output of the searched radio station (this transmission output is also stored in the radio station table in advance), whether or not a standard radio wave from the radio station can be received; Is determined (step SC4).

If the result of determination in step SC4 is that standard radio waves cannot be received, such as when the user is traveling by airplane in a foreign country, the receiving circuit 16 is turned off (step SC5). Therefore, it is possible to prevent the inconvenience that the receiving circuit 16 operates continuously despite the fact that the standard radio wave cannot be received and power is unnecessarily consumed. Subsequently, "reception disabled" is displayed on the monitor 12 (step SC6), so that the user can be informed that the reception is not possible due to distance but not a failure. Further, the closest radio station searched is displayed (step SC7), the distance to the radio station is displayed (step SC8), and the information is notified to the user. Further, since the standard time signal cannot be received, a time based on the stored world time is displayed (step SC9).

Further, for example, when the vehicle approaches the destination country due to the movement of an airplane and the distance from the searched radio station can be received, the process proceeds from step SC4 to step SC10 to turn on the receiving circuit 16 (step SC4). Step SC1
0). Subsequently, the frequency of the radio station is read from the transmission frequency area 21a of the radio station table 20 (step SC11), and the read frequency is set in the receiving circuit 16 (step SC12). Thereby, the receiving circuit 1
6 starts receiving standard radio waves from the nearest radio station,
The term code contained in the standard radio wave is obtained (step SC13). Thereafter, the display time data currently displayed on the monitor 12 is corrected based on the obtained term code (step SC14). Therefore, when approaching a certain country or the like while traveling by airplane or the like, the standard time of the country is automatically displayed without manual operation.

In the above-described embodiment, the GPS module is used as the position information acquiring means. However, the present invention is not limited to this, and a PHS (Personal Handy
Other means may be used, such as acquiring position data transmitted from the base station in the hpone system.

[0049]

As described above, according to the present invention, the stored map data is read out based on the received standard time signal and provided for display. Display becomes possible. Furthermore, since the map data corresponding to the area data specified in advance is read and provided for display, a more detailed and appropriate map can be displayed without using GPS information.

Further, since the acquired current position information is corrected based on the received standard radio wave, an intentional error included in the current position information can be corrected, and the current position can be detected with high accuracy. Becomes Further, since the current position is displayed on the map based on the map data based on the corrected position information, the current position can be accurately displayed on the map without errors. In addition, since the corresponding map data is read from the storage unit based on the received standard radio wave, the map can be displayed without depending on the current position information.

Further, since the receiving operation of the receiving means for receiving the standard radio wave transmitted from the radio station is controlled based on the acquired current position information, the receiving means does not always operate and the receiving operation is not performed. It is possible to avoid unnecessary operation of the means. Also, it is determined whether or not the standard time signal can be received based on the current position information, and when it is possible, the receiving means is operated. Power consumption can be avoided.

When it is determined that the standard radio wave cannot be received, the fact is displayed, so that the inconvenience of being mistaken as a failure of the apparatus can be prevented. In addition, since the frequency of the receivable standard radio wave is set in the receiving means based on the current position information, it is possible to automatically receive the standard radio wave of the arriving country, for example, when traveling between foreign countries. it can. In addition, since the current time is corrected based on the received standard radio wave, the display time can be automatically corrected to the time of the country where the display time has been reached, for example, when moving between foreign countries.

[0053]

[Brief description of the drawings]

FIG. 1 is a block diagram of an electronic timepiece with a GPS function according to an embodiment of the present invention.

FIG. 2 is a diagram showing a radio station table.

FIG. 3 is a diagram illustrating a sensitivity-distance correspondence table.

FIG. 4 is a memory configuration diagram of a RAM.

FIG. 5 is a flowchart showing a processing procedure in a correction data creation mode of the embodiment.

FIG. 6 is an explanatory diagram of a process in a correction data creation mode.

FIG. 7 is a flowchart showing a processing procedure in a current position display mode of the embodiment.

FIG. 8 is a diagram showing a display example.

FIG. 9 is a flowchart showing a processing procedure according to another embodiment of the present invention.

FIG. 10 is a diagram showing a format of a time code.

[Explanation of symbols]

 2 GPS module 4 CPU 5 Storage device 9 Map storage unit 12 Monitor 14 Recording medium 16 Receiving circuit 19 Clock counting circuit

Claims (11)

[Claims] 1. A receiving means for receiving a standard radio wave transmitted from a radio station, a map data storage means for storing map data, and based on the standard radio wave received by the receiving means,
Control means for reading map data from the map data storage means and providing the data for display. 2. The apparatus according to claim 1, further comprising a region data storage unit for storing region data specified in advance, wherein the control unit reads out corresponding map data based on the standard radio wave and the region data, and provides the map data for display. The receiving device according to claim 1, wherein: 3. A receiving means for receiving a standard radio wave transmitted from a radio station, a position information acquiring means for acquiring current position information, and the current position information acquired by the position information acquiring means. And a correction unit for correcting based on the standard radio wave received by the receiver. 4. Display means; map data storage means for storing map data; and map data read from the map data storage means,
4. The receiving device according to claim 3, further comprising: a control unit that displays a map on the display unit and displays a current position on the map based on the position information corrected by the correction unit. 5. The receiving apparatus according to claim 4, wherein said control means reads out corresponding map data from said map data storage means based on the standard radio wave received by said receiving means. 6. A position information obtaining means for obtaining current position information, a receiving means for receiving a standard radio wave transmitted from a radio station, and a receiving operation of the receiving means, A receiving device comprising: control means for controlling based on position information. 7. The control means determines whether or not the standard time signal can be received based on the current position information,
7. The receiving apparatus according to claim 6, wherein said receiving means is operated when possible. 8. The receiving apparatus according to claim 7, further comprising a display unit, wherein the control unit, when it is determined that the standard radio wave cannot be received, displays the fact on the display unit. . 9. The receiving apparatus according to claim 6, wherein said control means sets a frequency of a receivable standard radio wave to said receiving means based on said current position information. 10. The apparatus further comprising a display unit, wherein the control unit displays the current time on the display unit, and corrects the current time based on a standard time signal received by the reception unit. Claim 6
The receiving device according to the above. 11. A standard radio wave transmitting means for transmitting a standard radio wave, a receiving means for receiving the standard radio wave transmitted from the standard radio wave transmitting means, a position information obtaining means for obtaining current position information, Correction means for correcting the current position information acquired by the means based on the standard time signal received by the receiving means.