JP3840629B2 - Display distance measuring apparatus and distance display method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a distance display technique, and more particularly to a technique for measuring a distance displayed during a marathon or the like and increasing the distance smoothly.
[0002]
[Prior art]
In recent years, many relays such as marathons and relay stations have been carried out on televisions. On these relay screens, distance information indicating how many kilometers are currently running is displayed.
Currently, as a method for calculating the distance to be displayed, the rotation information of the tire of a moving vehicle running in parallel with the runner is used. This method is configured so that a predetermined number of electrical signals (vehicle speed pulses) are output each time the tire rotates, and the travel distance (distance coefficient) per pulse is stored in advance. Then, the current distance is obtained by counting the number of vehicle speed pulses as the movement starts and multiplying the count coefficient by the stored distance coefficient. For example, if the distance coefficient per pulse is 75.36 cm, and the count number of vehicle speed pulses is 10,000 pulses, the vehicle speed distance is 75.36 × 10000 = 753600 cm.
[0003]
[Problems to be solved]
However, the above-described method has a drawback that errors accumulate when the traveling distance of the moving vehicle becomes long. For example, moving vehicles may be off course due to lane changes, and depending on the course, moving vehicles may have to run on different courses from runners. It took a lot of time and effort to correct the error.
[0004]
Furthermore, if the distance displayed on the screen suddenly increases or decreases, the viewer feels uncomfortable, so it has to be increased smoothly.
Therefore, an object of the present invention is to solve the above-described problems and provide a technique capable of displaying a distance smoothly while eliminating an error in distance without requiring much time and labor. It is in.
[0005]
[Means for Solving the Problems]
The object of the present invention is a display distance measuring device,
A distance management table in which the latitude and longitude and the distance from the start point are stored in association with each other at a predetermined interval;
Receiving means for receiving GPS data from a satellite;
Latitude / longitude calculation means for calculating the latitude and longitude of the current position based on the GPS data received by the reception means;
Search means for searching the distance management table for the distance corresponding to the latitude and longitude closest to the latitude and longitude calculated by the latitude / longitude calculation means;
Updating means for updating the display distance by adding the predetermined distance to the current display distance at an update timing of the predetermined time or the predetermined distance;
The distance searched by the search means at the update timing is compared with the current display distance, and when the distance searched by the search means is larger than the current display distance by a predetermined distance or more, Update timing adjustment means for shortening the update timing and adjusting the update timing by lengthening the update timing when the distance searched by the search means is smaller than the current display distance. Achieved by a display distance measuring device.
[0006]
The invention of claim 1 further includes means for detecting a vehicle speed pulse and means for calculating a travel distance based on the detected vehicle speed pulse, and the update timing adjusting means has the travel distance equal to the predetermined distance. An increase by the distance can also be used for the update timing.
The invention of claim 1 further includes means for detecting a vehicle speed pulse, and means for calculating a travel distance by multiplying the detected vehicle speed pulse by a predetermined coefficient. An increase in the travel distance by the predetermined distance may be used as an update timing, and the update timing may be adjusted by weighting the coefficient.
[0007]
The object of the present invention is a display distance measuring device,
A distance management table in which the latitude and longitude and the distance from the start point are stored in association with each other at a predetermined interval;
Receiving means for receiving GPS data from a satellite;
Latitude / longitude calculation means for calculating the latitude and longitude of the current position based on the GPS data received by the reception means;
Search means for searching the distance management table for the distance corresponding to the latitude and longitude closest to the latitude and longitude calculated by the latitude / longitude calculation means;
A comparison means for comparing the current display distance and the distance searched by the search means at a predetermined time or update timing of the predetermined distance;
In comparison result of the comparing means, greater than the retrieved distance distance for the current display by said retrieval means, and the difference is less than a predetermined distance and the search distance between the current display range by the search means In this case, the current display distance is updated to the distance searched by the search means, and the distance searched by the search means is larger than the current display distance and searched by the search means. If the difference between the distance and the current display distance is equal to or greater than the predetermined distance , a distance larger than the normal increment distance is added to the current display distance and updated, and the search unit searches. A display updating unit that updates the distance by adding a distance that is smaller than the normal increase distance to the current display distance when the calculated distance is smaller than the current display distance. Display distance measuring device It is achieved by.
[0008]
The invention according to claim 4 further includes means for detecting a vehicle speed pulse and means for calculating a travel distance based on the detected vehicle speed pulse, and the comparison means has the travel distance of the predetermined distance. It can also be configured to use increasing for the update timing.
Further, the invention of claim 1 and claim 4 further includes means for detecting a vehicle speed pulse and means for calculating a travel distance based on the detected vehicle speed pulse, and GPS data from a satellite cannot be received. If the travel distance is used as the display distance, the distance measurement can be continued even when GPS data cannot be received.
[0009]
The object of the present invention is a method for displaying distance,
Creating a distance management table by associating latitude and longitude with a distance from a start point at a predetermined interval;
Receiving GPS data from a satellite and calculating the latitude and longitude of the current position based on the received GPS data;
Searching the distance management table for the distance corresponding to the latitude and longitude closest to the calculated latitude and longitude;
Updating the display distance by adding the predetermined distance to the current display distance at a predetermined time or update timing of the distance;
The searched distance is compared with the current display distance at the update timing. If the searched distance is greater than the current display distance by a predetermined distance or more, the update timing is shortened. And a step of adjusting the update timing by increasing the update timing when the searched distance is smaller than the current display distance.
[0010]
As the update timing, a vehicle speed pulse is detected, a travel distance is calculated based on the detected vehicle speed pulse, and an increase in the travel distance by the predetermined distance can be used as the update timing.
Further, a vehicle speed pulse is detected, a travel distance is calculated by multiplying the detected vehicle speed pulse by a predetermined coefficient, and the fact that the travel distance increases by the predetermined distance is used as an update timing, and the coefficient is weighted. The update timing may be adjusted by performing the above.
[0011]
The object of the present invention is a method for displaying distance,
Creating a distance management table by associating latitude and longitude with a distance from a start point at a predetermined interval;
Receiving GPS data from a satellite and calculating the latitude and longitude of the current position based on the received GPS data;
Searching the distance management table for the distance corresponding to the latitude and longitude closest to the calculated latitude and longitude;
Comparing the current display distance with the retrieved distance at a predetermined time or a predetermined distance update timing;
In the comparison result, the searched distance is greater than the distance for the current display, and if the difference between the retrieved distance between the current display distance is less than a predetermined distance, for the current display The distance is updated to the distance searched by the search means, the searched distance is larger than the current display distance, and the difference between the searched distance and the current display distance is the predetermined distance. If it is above , the distance larger than the normal increment distance is updated by adding to the current display distance, and if the retrieved distance is smaller than the current display distance, And a step of adding a distance smaller than the increased distance to the current display distance and updating the distance.
[0012]
Note that a vehicle speed pulse may be detected, a travel distance may be calculated based on the detected vehicle speed pulse, and an increase in the travel distance by the predetermined distance may be used for the update timing.
When GPS data from a satellite cannot be received, a vehicle speed pulse is detected, a travel distance is calculated based on the detected vehicle speed pulse, and this travel distance is used as a display distance.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described.
FIG. 1 is a configuration diagram of an embodiment of the present invention.
In FIG. 1, reference numeral 1 denotes a GPS receiver that receives GPS data from a satellite.
Reference numeral 2 denotes a latitude / longitude calculator that calculates latitude and longitude based on GPS data received by the GPS receiver 1. The latitude / longitude calculator 2 is a well-known technique in the field of technology using GPS, and will not be described in detail.
[0014]
A distance table 3 stores latitude / longitude data and distance data in association with each other. FIG. 2 shows an example of the distance table 3. As shown in FIG. 2, a combination of latitude and longitude and a distance are associated with each other every 10 m starting from the start point. For example, when the latitude is 35 degrees 24 minutes 52.996 seconds and the longitude is 139 degrees 38 minutes 36.632 seconds, the distance is 2.47 km. This distance table is prepared for each section.
[0015]
Reference numeral 4 denotes a GPS distance calculation unit. The GPS distance calculation unit 4 searches the distance table 3 based on the latitude / longitude from the latitude / longitude calculation unit 2 and calculates the distance closest to the given latitude / longitude. For example, when the given latitude / longitude is 35 degrees 24 minutes 52.980 seconds latitude and 139 degrees 38 minutes 36.657 seconds longitude, the distance 2.470 m is calculated. In the following description of the present embodiment, the distance calculated by the GPS distance calculation unit 4 is referred to as a GPS distance.
[0016]
Reference numeral 5 denotes a vehicle speed pulse measuring unit that detects vehicle speed pulses.
Reference numeral 6 denotes a vehicle speed distance calculation unit. The vehicle speed distance calculation unit 6 calculates a distance based on the vehicle speed pulse from the vehicle speed pulse measurement unit 5. In this calculation, a distance (section coefficient) per pulse is stored in advance, and the distance is calculated by multiplying the section coefficient by the vehicle speed pulse from the vehicle speed pulse measuring unit 5. For example, assuming that 75.36 cm travels per pulse, when the vehicle speed pulse from the vehicle speed pulse measuring unit 5 is 10,000 pulses, the distance is 75.36 × 10000 = 753600 cm. Since the section coefficient mentioned above may differ for every section, a section coefficient is prepared for every section. In the following description of the present embodiment, the distance calculated by the vehicle speed distance calculation unit 6 is referred to as a vehicle speed distance.
[0017]
Reference numeral 7 denotes a display distance processing unit. The display distance processing unit 7 receives the vehicle speed distance from the vehicle speed distance calculation unit 6 and when the vehicle speed distance increases by a predetermined distance X, this is used as an update timing to add the predetermined distance Y to the current display distance. Update the display distance. Reference numeral 8 denotes an update timing adjusting means. This update timing adjustment means 8 receives the vehicle speed distance from the vehicle speed distance calculation unit 6 and, when the vehicle speed distance increases by a predetermined distance X, uses this as a timing to determine the GPS distance from the GPS distance calculation unit 4 and the current display distance. And the update timing of the display distance processing unit 7 is adjusted based on the comparison result. As an adjustment method, the GPS distance is compared with the current display distance, and the GPS distance is a predetermined distance or more than the current display distance (usually a natural increase of the GPS distance or more. In the case of 20 m or more), if it is larger, the increase X of the vehicle speed distance, which is the update timing, is decreased, and the update timing is advanced. On the other hand, when the GPS distance is smaller than the current display distance, the increase X of the vehicle speed distance that is the update timing is increased, and the update timing is delayed.
[0018]
Next, the operation of the embodiment in the configuration described above will be described.
First, the operation for calculating the GPS distance will be described. FIG. 3 is an operation flowchart for calculating the GPS distance.
First, the GPS distance calculation unit 4 reads the distance table of the current section from the distance table 3 (Step 100). Subsequently, GPS data is received by the GPS receiver 1 (Step 101). If the GPS data can be received, the GPS data is output to the latitude / longitude calculation unit 2 (Step 102). Upon receiving the GPS data, the latitude / longitude calculation unit 2 calculates the latitude and longitude based on the GPS data, and outputs the calculated latitude and longitude to the GPS distance calculation unit 4 (Step 103). The GPS distance calculation unit 4 searches the distance table for the distance corresponding to the latitude and longitude closest to the received latitude and longitude (Step 104). Then, this distance is output as a GPS distance (Step 105). In this manner, the GPS distance is calculated, and when the current section is exceeded (Step 106), the distance table of the new section is updated (Step 100).
[0019]
Next, the operation for calculating the vehicle speed distance will be described. FIG. 4 is a flowchart of the vehicle speed distance calculation operation.
First, the vehicle speed distance calculation unit 6 updates the section coefficient (Step 200). The vehicle speed measurement unit 5 measures the vehicle speed pulse and outputs the vehicle speed pulse to the vehicle speed distance calculation unit 6 (Step 201). The vehicle speed distance calculation unit 6 multiplies the measured vehicle speed pulse by a section coefficient to calculate the vehicle speed distance (Step 202), and outputs this vehicle speed distance (Step 203). In this way, the vehicle speed distance is calculated, and when the section is exceeded (Step 204), the section coefficient is updated to a new section coefficient (Step 200).
[0020]
Next, operations of the display distance processing unit 7 and the update timing adjustment unit 8 will be described. FIG. 5 is an operation flowchart of the display distance processing unit 7 and the update timing adjustment unit 8. In the description of this operation, the increment X of the vehicle speed distance, which is the update timing, is 10 m, and the distance Y to be added to the current display distance is 10 m in accordance with the increment of the GPS distance.
[0021]
First, the update timing adjustment unit 8 measures the vehicle speed distance from the vehicle speed distance calculation unit 6 (Step 300). When the vehicle speed distance increases by 10 m (Step 301), the previous GPS distance is compared with the current GPS distance (Step 302). If the current GPS distance is smaller than the previous GPS distance by a predetermined number of times (for example, three times) (Step 303), the moving vehicle moves in the reverse direction (for example, the moving vehicle is U If it is turned), the distance display is set to the GPS distance as an exception (Step 304). In other cases, it is determined that the moving vehicle is moving normally, and the forward direction is determined.
[0022]
Subsequently, when the forward direction is determined, the current display distance is compared with the latest GPS distance (Step 305).
Here, when the GPS distance is smaller than the current display distance (Step 306), the increment of the vehicle speed distance that is the update timing is increased from 10 m, and the update timing is delayed (Step 309).
[0023]
On the other hand, when the GPS distance is larger than the current display distance and the difference is 20 m or less (Step 307), 10 m is added to the current display distance as usual to obtain a new display distance (Step 310). ).
When the GPS distance is 20 m or more larger than the current display distance (Step 307), the increase in the vehicle speed distance, which is the update timing, is decreased from 10 m and the update timing is advanced (Step 308).
[0024]
The display distance processing unit 7 measures the vehicle speed distance from the vehicle speed distance calculation unit 6, adds 10 m to the current display distance at the update timing adjusted by the update timing adjustment unit 8, and updates it to a new display distance. (Step 310).
Here, another aspect of the adjustment of the update timing will be described.
In the above-described example, an increase in the vehicle speed distance is used as the update timing, and the update timing is adjusted by increasing or decreasing the increase. In this aspect, the increase in the vehicle speed distance is fixed, and the update timing is adjusted by weighting the section coefficient used for calculating the vehicle speed distance. This will be specifically described below.
[0025]
The update timing adjustment means 8 receives the vehicle speed distance from the vehicle speed distance calculation unit 6 and, when the vehicle speed distance increases by a predetermined distance X, uses this as a timing to determine the GPS distance from the GPS distance calculation unit 4 and the current display distance. It is the same that the update timing of the display distance processing unit 7 is adjusted based on the comparison result. The difference is that the GPS distance is compared with the current display distance, and the GPS distance is a predetermined distance or more than the current display distance (usually more than the natural increase of the GPS distance. In the case of larger than 20 m), the section coefficient of the vehicle speed distance calculation unit 6 is multiplied by a coefficient larger than 1 to increase the section coefficient. On the other hand, when the GPS distance is smaller than the current display distance, the section coefficient of the vehicle speed distance calculation unit 6 is multiplied by a coefficient smaller than 1 to reduce the section coefficient.
[0026]
For example, if the section coefficient of the vehicle speed distance calculation unit 6 is 75.36 (cm), the GPS distance is a predetermined distance or more than the current display distance (usually a natural increase of the GPS distance or more). In the case of 20 m or more in the embodiment), when it is large, the weighting coefficient is set to 1.3, and this weighting coefficient 1.3 is multiplied by 75.36. Then, the distance per pulse increases, the time to reach the increase X in the vehicle speed distance is earlier than in the normal case, and the update timing is shortened. On the other hand, when the GPS distance is smaller than the current display distance, the weighting coefficient is set to 1 / 1.3, and the weighting coefficient 1 / 1.3 is multiplied by 75.36. Then, the distance per pulse becomes small, the time to reach the increase X in the vehicle speed distance is later than usual, and the update timing becomes longer.
[0027]
Next, operations of the display distance processing unit 7 and the update timing adjustment unit 8 in another aspect will be described. FIG. 6 is an operation flowchart of the display distance processing unit 7 and the update timing adjustment unit 8. In the description of this operation, the increment X of the vehicle speed distance, which is the update timing, is 10 m, and the weighting factors are 1.3 and 1 / 1.3.
First, the update timing adjustment unit 8 measures the vehicle speed distance from the vehicle speed distance calculation unit 6 (Step 500). When the vehicle speed distance increases by 10 m (Step 501), the previous GPS distance is compared with the current GPS distance (Step 502). When the current GPS distance is smaller than the previous GPS distance by a predetermined number of times (for example, three times) (Step 503), the moving vehicle moves in the opposite direction (for example, the moving vehicle is U If it is turned), the distance display is adjusted to the GPS distance as an exception (Step 504). In other cases, it is determined that the moving vehicle is moving normally, and the forward direction is determined.
[0028]
Subsequently, when the forward direction is determined, the current display distance is compared with the latest GPS distance (Step 505).
If the GPS distance is smaller than the current display distance (Step 506), the weighting factor 1 / 1.3 is applied to the section coefficient to delay the update timing (Step 509).
[0029]
On the other hand, when the GPS distance is larger than the current display distance and the difference is 20 m or less (Step 507), 10m is added to the current display distance as usual to obtain a new display distance (Step 510). ).
When the GPS distance is 20 m or more larger than the current display distance (Step 507), the weighting coefficient 1.3 is applied to the section coefficient to advance the update timing (Step 508).
[0030]
The display distance processing unit 7 measures the vehicle speed distance from the vehicle speed distance calculation unit 6, adds 10 m to the current display distance at the update timing adjusted by the update timing adjustment unit 8, and updates it to a new display distance. (Step 510).
Next, a second embodiment will be described.
FIG. 7 is a block diagram of the second embodiment of the present invention.
[0031]
The difference from the first embodiment is that a comparison unit 10 and a display distance update unit 11 are provided in place of the display distance processing unit 7 update timing adjustment unit 8. Other configurations are the same as those in the first embodiment, and thus description thereof is omitted.
The comparison unit 10 receives the vehicle speed distance from the vehicle speed distance calculation unit 6 and compares the GPS distance from the GPS distance calculation unit 4 with the current display distance at the timing when the vehicle speed distance increases by a predetermined distance X. To do. (1) When the GPS distance is larger than the current display distance and equal to or less than the predetermined distance (usually a natural increase of the GPS distance, and in this embodiment, the GPS distance is the current display distance. (2) GPS distance is a predetermined distance or more than the current display distance (usually a natural increase or more of the GPS distance, which is 20 m in the present embodiment). The above is notified to the display distance update unit 11 in three stages: when the distance is large, and (3) when the GPS distance is smaller than the current display distance.
[0032]
The display distance update unit 11 updates the display distance based on the comparison result of the comparison unit 11. Specifically, (1) when the GPS distance is greater than the current display distance and less than or equal to a predetermined distance, the current display distance is updated to the latest GPS distance, and (2) the GPS distance is If the distance is greater than the display distance by a predetermined distance, the display distance is updated by multiplying the normal distance increase by multiplying the normal increase Xm by the weighting coefficient 1.3, and (3) the GPS distance is If the distance is smaller than the current display distance, the display distance is updated by reducing the normal distance increase by applying a weighting coefficient 1 / 1.3 to Xm, which is the normal increase.
[0033]
Hereinafter, operations of the comparison unit 10 and the display distance update unit 11 will be described with reference to a flowchart of FIG. Since the operation for calculating the GPS distance and the operation for calculating the vehicle speed distance are the same as those in the first embodiment, the description thereof will be omitted. X is 10 m.
First, the comparison unit 10 measures the vehicle speed distance from the vehicle speed distance calculation unit 6 (Step 600). When the vehicle speed distance increases by 10 m (Step 601), the previous GPS distance is compared with the current GPS distance (Step 602). If the current GPS distance is smaller than the previous GPS distance by a predetermined number of times (for example, three times) (Step 603), the moving vehicle moves in the opposite direction (for example, the moving vehicle is U The display distance update unit 11 adjusts the distance display to the GPS distance (Step 604). In other cases, it is determined that the moving vehicle is moving normally, and the forward direction is determined.
[0034]
Subsequently, when the forward direction is determined, the current display distance is compared with the latest GPS distance (Step 605).
Here, when the GPS distance is smaller than the current display distance (Step 606), an increase distance of 10 m multiplied by 1 / 1.3 is added to the current display distance to obtain a new display distance. (Step 609).
[0035]
On the other hand, when the GPS distance is larger than the current display distance and the difference is 20 m or less (Step 607), the current display distance is updated to the latest GPS distance as usual (Step 610).
When the GPS distance is 20 m or more larger than the current display distance (Step 607), the new display distance is calculated by adding the increased distance of 10 m to 1.3 to the current display distance. (Step 608).
[0036]
Then, the above operation is repeated.
Next, a third embodiment will be described.
In the third embodiment, as shown in FIG. 9, in addition to the first embodiment, a detection unit 9 for detecting whether or not GPS data has been correctly received is provided. With such a configuration, even if GPS data cannot be received in mountainous areas, tunnels, valleys of buildings, etc., the display distance can be updated and GPS data can be received again. If so, an accurate distance can be measured.
[0037]
Hereinafter, this operation will be described with reference to FIG.
When the GPS data cannot be received, the detection unit 9 outputs a detection signal to the display distance processing unit 7 (FIG. 3, Step 102).
When receiving the detection signal, the display distance processing unit 7 stops updating the display distance by GPS and switches the update of the display distance to update by the vehicle speed distance from the vehicle speed distance calculation unit 6 (Step 400). Then, every time the vehicle speed distance increases by 10 m (Step 401), 10 m is added to the current display distance to be updated (Step 402). When the GPS can be received, the normal GPS returns to the distance update operation (Step 403).
[0038]
In the state before GPS data can no longer be received, if there is a large difference between the current display distance and the GPS distance data, and the update timing has been adjusted, the update timing is retained and the current distance and display distance remain unchanged. You may comprise so that adjustment may be performed.
[0039]
【The invention's effect】
According to the present invention, it is possible to display the distance smoothly while eliminating the error in the distance without requiring much time and labor.
Also, if the vehicle speed distance is used together, the display distance can be updated and GPS data can be received again even when GPS data cannot be received in mountainous areas, tunnels, valleys of buildings, etc. If it becomes, the exact distance can be measured.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an embodiment of the present invention.
FIG. 2 is a diagram for explaining a distance table;
FIG. 3 is an operation flowchart of GPS distance calculation.
FIG. 4 is an operation flowchart of calculation of a vehicle speed distance.
FIG. 5 is an operation flowchart of the display distance processing unit 7 and the update timing adjustment unit 8;
FIG. 6 is an operation flowchart of another mode of update timing.
FIG. 7 is a configuration diagram of the second embodiment;
FIG. 8 is an operation flowchart of the second embodiment;
FIG. 9 is a configuration diagram of the third embodiment.
FIG. 10 is an operation flowchart of the third embodiment;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 GPS receiving part 2 Latitude / longitude calculation part 3 Distance table 4 GPS distance calculation part 5 Vehicle speed pulse measurement part 6 Vehicle speed distance calculation part 7 Display distance processing part 8 Update timing adjustment means 9 Detection part 10 Comparison part 11 Display distance update part

Claims (12)

A display distance measuring device,
A distance management table in which the latitude and longitude and the distance from the start point are stored in association with each other at a predetermined interval;
Receiving means for receiving GPS data from a satellite;
Latitude / longitude calculation means for calculating the latitude and longitude of the current position based on the GPS data received by the reception means;
Search means for searching the distance management table for the distance corresponding to the latitude and longitude closest to the latitude and longitude calculated by the latitude / longitude calculation means;
Updating means for updating the display distance by adding the predetermined distance to the current display distance at an update timing of the predetermined time or the predetermined distance;
The distance searched by the search means at the update timing is compared with the current display distance, and when the distance searched by the search means is larger than the current display distance by a predetermined distance or more, Update timing adjustment means for shortening the update timing and adjusting the update timing by lengthening the update timing when the distance searched by the search means is smaller than the current display distance. Display distance measuring device. Means for detecting a vehicle speed pulse; and means for calculating a travel distance based on the detected vehicle speed pulse;
The display distance measuring device according to claim 1, wherein the update timing adjusting unit uses the increase in the travel distance by the predetermined distance as an update timing. Means for detecting a vehicle speed pulse; and means for calculating a travel distance by multiplying the detected vehicle speed pulse by a predetermined coefficient;
The update timing adjusting means is configured to use the increase in the travel distance by the predetermined distance as an update timing and adjust the update timing by weighting the coefficient. The display distance measuring device according to 1. A display distance measuring device,
A distance management table in which the latitude and longitude and the distance from the start point are stored in association with each other at a predetermined interval;
Receiving means for receiving GPS data from a satellite;
Latitude / longitude calculation means for calculating the latitude and longitude of the current position based on the GPS data received by the reception means;
Search means for searching the distance management table for the distance corresponding to the latitude and longitude closest to the latitude and longitude calculated by the latitude / longitude calculation means;
A comparison means for comparing the current display distance and the distance searched by the search means at a predetermined time or update timing of the predetermined distance;
In the comparison result of the comparison means, the distance searched by the search means is larger than the current display distance, and the difference between the distance searched by the search means and the current display distance is less than a predetermined distance. In this case, the current display distance is updated to the distance searched by the search means, and the distance searched by the search means is larger than the current display distance and searched by the search means. If the difference between the distance and the current display distance is equal to or greater than the predetermined distance, a distance larger than the normal increment distance is added to the current display distance and updated, and the search unit searches. A display updating unit that updates the distance by adding a distance that is smaller than the normal increase distance to the current display distance when the calculated distance is smaller than the current display distance. Display distance measuring device . Means for detecting a vehicle speed pulse; and means for calculating a travel distance based on the detected vehicle speed pulse;
The display distance measuring apparatus according to claim 4, wherein the comparison unit uses, as an update timing, an increase in the travel distance by the predetermined distance . Means for detecting a vehicle speed pulse, and means for calculating a travel distance based on the detected vehicle speed pulse;
6. The display distance measuring apparatus according to claim 1, wherein when the GPS data from the satellite cannot be received, the travel distance is used as a display distance. A method for displaying distance,
Creating a distance management table by associating latitude and longitude with a distance from a start point at a predetermined interval;
Receiving GPS data from a satellite and calculating the latitude and longitude of the current position based on the received GPS data;
Searching the distance management table for the distance corresponding to the latitude and longitude closest to the calculated latitude and longitude;
Updating the display distance by adding the predetermined distance to the current display distance at an update timing of the predetermined time or the predetermined distance;
The searched distance is compared with the current display distance at the update timing. If the searched distance is greater than the current display distance by a predetermined distance or more, the update timing is shortened. And a step of adjusting the update timing by increasing the update timing when the searched distance is smaller than the current display distance. The distance display method according to claim 7, wherein a vehicle speed pulse is detected, a travel distance is calculated based on the detected vehicle speed pulse, and an increase in the travel distance by the predetermined distance is used as an update timing. A vehicle speed pulse is detected, a travel distance is calculated by multiplying the detected vehicle speed pulse by a predetermined coefficient, and an increase in the travel distance by the predetermined distance is used as an update timing, and the coefficient is weighted The distance display method according to claim 7, wherein the update timing is adjusted accordingly. A method for displaying distance,
Creating a distance management table by associating latitude and longitude with a distance from a start point at a predetermined interval;
Receiving GPS data from a satellite and calculating the latitude and longitude of the current position based on the received GPS data;
Searching the distance management table for the distance corresponding to the latitude and longitude closest to the calculated latitude and longitude;
Comparing the current display distance with the retrieved distance at a predetermined time or a predetermined distance update timing;
In the comparison result, when the searched distance is larger than the current display distance and the difference between the searched distance and the current display distance is less than a predetermined distance, the current display distance The distance is updated to the distance searched by the search means, the searched distance is larger than the current display distance, and the difference between the searched distance and the current display distance is the predetermined distance. If it is above, the distance larger than the normal increment distance is updated by adding to the current display distance, and if the retrieved distance is smaller than the current display distance, And a step of adding a distance smaller than the increased distance to the current display distance and updating the distance. The distance display method according to claim 10, wherein a vehicle speed pulse is detected, a travel distance is calculated based on the detected vehicle speed pulse, and an increase in the travel distance by the predetermined distance is used as an update timing.   8. When GPS data from a satellite cannot be received, a vehicle speed pulse is detected, a travel distance is calculated based on the detected vehicle speed pulse, and the travel distance is used as a display distance. The distance display method according to claim 11.

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