JP4089078B2 - Data acquisition apparatus and data acquisition method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a data acquisition device and a data acquisition method for acquiring geological data such as altitude and direction.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in an electronic wristwatch that operates using a battery as a power source, not only simply notifies the user of the time, but also, for example, by providing a pressure sensor, the altitude (altitude above sea level) and by providing a magnetic sensor, the direction (magnetic north) That can measure the direction). On the other hand, for example, in a GPS receiver used in an automobile navigation device or a handy-type GPS receiver that operates using a battery as a power source, at the same time as its current position based on positioning information sent from a GPS satellite, The altitude and direction of the current position can be measured.
[0003]
[Problems to be solved by the invention]
However, in the altitude measurement using the pressure sensor described above, an error due to the influence of the weather is inevitably generated because the altitude is measured based on the atmospheric pressure, and in order to perform high-precision azimuth measurement using the magnetic sensor, Adjustment of different characteristics for each magnetic sensor is required in the manufacturing stage. On the other hand, altitude measurement and azimuth measurement using GPS satellites have a drawback that accurate measurement cannot be performed unless a predetermined number or more of GPS satellites can be captured.
[0004]
The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a data acquisition device and a data acquisition method capable of acquiring accurate geological data such as altitude and direction in the current location of the user. To do.
[0005]
[Means for Solving the Problems]
In order to solve the above problem, the receiving apparatus according to claim 1,
A data acquisition device for acquiring geological data about the current location of the self,
Detecting means for detecting basic data used for obtaining the geological data;
Receiving means for receiving positioning information sent from a satellite;
The first geological data based on the basic data detected by the detecting means is corrected by the second geological data based on the positioning information received by the receiving means, and the corrected geological data is obtained as acquired data. Correction means
Terrain information storage means storing terrain information of each place;
Position data acquisition means for acquiring position data indicating its current location based on the positioning information received by the reception means;
Determination means for determining whether or not the current location indicated by the current data acquired by the position data acquisition means is flat based on the terrain information stored in the terrain information storage means,
The correction condition is a determination by the determination means that the current location is a flat ground,
The correction means corrects the first geological data with the second geological data when a correction condition determined according to the type of geological data to be acquired is satisfied.
[0006]
According to the receiving apparatus of claim 1, the first geological data based on the detected basic data is corrected by the second geological data based on the received positioning information, and the corrected geological data is It can be acquired data. Therefore, more accurate geological data can be acquired. In addition, it is possible to reliably and promptly determine whether or not the current location is flat based on the stored topographic information.
[0009]
In the receiving device of claim 2 ,
A data acquisition device for acquiring geological data about the current location of the self,
Detecting means for detecting basic data used for obtaining the geological data;
Receiving means for receiving positioning information sent from a satellite;
The first geological data based on the basic data detected by the detecting means is corrected by the second geological data based on the positioning information received by the receiving means, and the corrected geological data is obtained as acquired data. Correction means
The correction means corrects the first geological data with the second geological data when a correction condition determined according to the type of geological data to be acquired is satisfied,
The correction condition is a condition that a difference between the first geological data and the second geological data is within a predetermined range.
[0010]
According to the receiving device of claim 2 , the first geological data based on the detected basic data is corrected by the second geological data based on the received positioning information, and the corrected geological data is It can be acquired data. Therefore, more accurate geological data can be acquired. Further, when the correction condition determined according to the type of geological data to be acquired is satisfied, the first geological data can be corrected by the second geological data. The correction condition may be a condition that a difference between the first geological data and the second geological data is within a predetermined range.
[0016]
In the data acquisition method according to claim 3,
In a data acquisition method for acquiring altitude data indicating the altitude of the current location, the terrain information storage means storing the terrain information of each place is accessed, and the current location is preliminarily determined based on the terrain information stored in the terrain information storage means. Judgment is made on whether or not the terrain is determined. As a result of the determination, when the current location is a predetermined terrain, the first altitude data acquired based on the basic data detected by itself is received from the satellite. The correction is performed using the second altitude data acquired based on the positioning information, and the corrected data is used as acquired data.
[0017]
According to the data acquisition method of the third aspect, the terrain information storage means storing the terrain information of each place is accessed, and the current location is determined in advance based on the terrain information stored in the terrain information storage means. If the current location is a predetermined terrain as a result of the determination, the first altitude data acquired based on the basic data detected by itself is determined based on the positioning information received from the satellite. Correction is performed using the acquired second altitude data, and the corrected data can be used as acquired data. Therefore, more accurate geological data can be acquired.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
[0020]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a data acquisition apparatus 1 according to the present invention.
[0021]
The data acquisition device 1 is a wristwatch that can be worn on the user's arm, and has a GPS antenna 2 and a GPS processing unit 3. The GPS processing unit 3 includes an RF, an A / D, a data register, a counter, a decoder, and a CPU, a ROM, a RAM, and the like that control them. The GPS processing unit 3 amplifies and demodulates the L1 band received radio wave received from the GPS satellite 2 received by the GPS antenna 2, then decodes the satellite data such as the ephemeris information and the almanac information, and calculates the self position based on the decoded data. And so on. The measurement result by the GPS processing unit 3 is sent to the CPU 4 that controls the entire data acquisition device 1 and then displayed on an LCD (not shown) provided in the display circuit 5. When the measurement is not performed, the display unit displays the current time sent to the CPU 4 from the clock face and the clock unit (not shown). Power supply to the GPS processing unit 3 and the CPU 4 is performed by a power supply circuit 6 including a power supply (battery). The CPU 4 operates based on a program stored in the ROM 8 while using the RAM 7 as a working memory, and controls each unit such as the GPS processing unit 3. Various data are stored in the RAM 7 when the CPU 4 controls.
[0022]
Further, the CPU 4 has a switch input unit 9 to which a plurality of switches for a user to operate the positioning device 1 are connected, a satellite data storage unit 10, a map data storage unit 11, an azimuth detection unit 12, and an altitude detection unit. 13 is connected. The satellite data storage unit 10 is a nonvolatile memory such as an EEPROM for storing satellite data such as ephemeris information and almanac information read or updated by the GPS processing unit 3. The map data storage unit 11 is a ROM in which data that is not changed, such as map data and positioning system data, is stored, and the map data includes topographic information such as elevation data of each point. The direction detection unit 12 has a magnetic sensor 14 (for example, MR element (magnetoresistance element)) for detecting the direction of geomagnetism, and the detection signal of the magnetic sensor 14 is processed by the direction detection unit 12 and sent to the CPU 4. . The altitude detection unit 13 has a pressure sensor 15 for detecting the atmospheric pressure, and the detection signal of the pressure sensor 15 is processed by the altitude detection unit 13 and sent to the CPU 4.
[0023]
Next, in the data acquisition device 1 configured as described above, for example, an operation related to altitude measurement processing executed by the CPU 4 when the altitude measurement mode is set by the user will be described with reference to the flowchart of FIG.
[0024]
That is, the CPU 4 receives the positioning information sent from the GPS satellite by the GPS processing unit 3, measures the altitude of the current location based on the received positioning information, and uses the measurement result as the first measurement result (A). Store in the RAM 7 (step SA1). Further, the altitude of the current location is measured based on the atmospheric pressure detected by the pressure sensor 15 of the altitude detecting unit 13, and the measurement result is stored in the RAM 7 as the second measurement result (B) (step SA2). Subsequently, an average value of the first measurement result (A) and the second measurement result (B) is calculated, and the result is set as a final measurement result (step SA3) and displayed on the LCD of the display circuit 5 (Step SA4), and the altitude measurement process is terminated.
[0025]
Therefore, in the present embodiment, the measurement altitude at which the error due to the difference in the environment such as the weather at the time of measurement is a concern, that is, the measurement altitude based on the atmospheric pressure detected by the pressure sensor 15 is determined not to be affected by the weather. By correcting the measured altitude based on the information, it is possible to obtain a more accurate altitude at the current position.
[0026]
(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 3 is a flowchart showing operations related to another altitude measurement process executed by the CPU 4 in the data acquisition apparatus 1 having the same configuration as that of FIG.
[0027]
That is, the CPU 4 measures the altitude of the current location based on the atmospheric pressure detected by the pressure sensor 15 of the altitude detecting unit 13, and stores the measurement result in the RAM 7 as the first measurement result (A) (step SB1). Next, the positioning information sent from the GPS satellite is received by the GPS processing unit 3, and the current position is measured based on the received positioning information (step SB2). Subsequently, based on the measurement result here, that is, the latitude / longitude data, the map data around the current location is read from the map data storage unit 11 (step SB3), and the current location is a flat ground from the topographic information included in the read map data. Is determined (step SB4). Such determination is made based on, for example, altitude data or the like based on whether or not an area having a predetermined area centered on the current location is such that a plurality of contour lines are drawn.
[0028]
Here, when it is determined that the vicinity of the current location is flat, the altitude of the current location is continuously measured based on the positioning information received in step SB2, and the measurement result is stored in the RAM 7 as the second measurement result (B) ( Step SB5). Thereafter, an average value of the first measurement result (A) and the second measurement result (B) described above is calculated, and the result is used as a final measurement result (step SB6). The information is displayed on the LCD of the display circuit 5 (step SA4), and the altitude measurement process is terminated. If the determination result in step SB4 is NO and it can be determined that the current location is not flat, that is, if the current location is considered to be a mountainous area or the like, the first measurement result (A) stored in the RAM 7 is used. Are used as final measurement results (step SB8), are displayed (step SB7), and the altitude measurement process is terminated.
[0029]
Therefore, in the present embodiment, when the vicinity of the current location is a flat ground, a more accurate altitude of the current position can be acquired as in the first embodiment. Moreover, it is expected that the altitude data that can be acquired based on the positioning information will contain large errors when the current location is not flat, but in mountains, etc., that is, the reception status of radio waves is bad or the number of satellites that can be captured is small. When it is done, such data can prevent the accuracy of the final measurement result from being lowered. Therefore, the accuracy of the measurement altitude can be maintained without being affected by the geographical conditions of the current location.
[0030]
(Third embodiment)
Next, a third embodiment of the present invention will be described.
4, in the data acquisition apparatus 1 having the same configuration as FIG. 1, for example, when the user specific mode is set, the current position to be executed by the CPU4 optionally operate on advanced determination processing It is a flowchart which shows.
[0031]
That is, when starting this operation, the CPU 4 receives the positioning information sent from the GPS satellite by the GPS processing unit 3, and measures the current position and the altitude (Xm) of the current location based on the received positioning information (step). SC1) Further, the altitude Ym of the current location is measured based on the atmospheric pressure detected by the pressure sensor 15 of the altitude detecting unit 13 (step SC2). Next, after incrementing the number of trials of each measurement process (step SC3), whether or not the difference between the measured heights Xm and Ym measured in steps SC1 and SC2 is within a predetermined error range. Is determined (step SC4). If the difference is within the error range, it is determined that the measurement result by the pressure sensor 15 is valid, and the measurement result and the current position (latitude / longitude) are determined as the final measurement result (step SC5). The process is terminated.
[0032]
When the determination result in step SC4 is NO and the difference between the two measured altitudes Xm and Ym is outside the error range, that is, the measured altitude Ym by the pressure sensor 15 or the measured altitude Xm based on the positioning information. When it can be determined that there is a large error in any of them, if the number of trials does not exceed the predetermined number (NO in step SC6), the process returns to step SC1 and the above-described measurement processes are repeated again. If measurement altitudes Xm and Ym in which the difference between them is within the error range are obtained while repeating steps SC1 to SC4, the process proceeds to step SC5. Thereby, a measurement result that is expected to include a large error can be eliminated, and a more accurate measurement altitude based on the detection result of the pressure sensor 15 can be obtained. If the measurement altitudes Xm and Ym whose difference is within the error range are not obtained even if the above-described measurement processes are repeated a predetermined number of times, the current location altitude is not determined and only the current position is determined. (Step SC7), the process ends.
[0033]
Therefore, in the present embodiment, for example, when it is expected that the measurement altitude Xm based on the positioning information includes a large error due to the geographical conditions of the current location, the final result is based on such data. It is possible to prevent a decrease in accuracy of typical measurement results. Therefore, a more accurate measurement altitude can be obtained.
[0034]
In the present embodiment, the final measurement altitude is set as the detection result of the pressure sensor 15, but for example, the difference between the measurement altitude Ym measured by the pressure sensor 15 and the measurement altitude Xm determined by the positioning information is a predetermined value. When it is within the error range, the measurement altitude Ym by the pressure sensor 15 is corrected by the measurement altitude Xm by the positioning information as in the first and second embodiments described above, and the correction result is the final measurement altitude. You may make it do.
[0035]
(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. FIG. 5 is a flowchart showing an operation related to the tilt angle detection process executed by the CPU 4 when the tilt angle detection mode is set by the user, for example, in the data acquisition apparatus 1 having the same configuration as FIG.
[0036]
That is, when starting this operation, the CPU 4 receives the positioning information sent from the GPS satellite by the GPS processing unit 3, and measures the position of the point A located at that time based on the received positioning information (step SD1). ), The altitude at point A is measured by the pressure sensor 15 (step SD2). The measurement position and measurement altitude data are sequentially stored in the RAM 7 or the like. Thereafter, the system waits until the predetermined time elapses, and with the elapse of the predetermined time (step SD3), the position is measured again with the point located at that time as the B point (step SD4). Subsequently, the distance X between the points A and B is obtained from the measurement result here and the data stored in the RAM 7 or the like (step SD5), and if it is not greater than the predetermined distance (NO in step SD6), Return to step SD3. If the distance is equal to or greater than the predetermined distance, the altitude difference Y between the points A and B is obtained (step SD8) after the altitude at that point (point B) is measured by the pressure sensor 15 (step SD7). And the following formula θ = arctan (distance X / altitude difference Y)
Is calculated (step SD9), and the process is terminated.
[0037]
Thereby, the inclination angle of the route from a certain point (A point) to another point (B point) can be automatically measured without causing the user to input any numerical data. Here, since the altitude data measured by the pressure sensor 15 is used when acquiring the inclination angle, the degree of inclination of the route between a certain point (point A) and another point (point B) is tight. Even in places where reception conditions are poor, that is, where the number of satellites that can be captured is small, unlike the case of using altitude data acquired based on positioning information, the acquired tilt angle has an error due to the influence of such locations. Does not exist. Therefore, more accurate tilt angle data can be obtained without being affected by the topography.
[0038]
In the present embodiment, when the tilt angle detection mode is set by the user, the location at that time is set as a point A, and another point that is more than a certain distance from that point is set as a B point. Although the inclination angle of the route is measured, it may be as follows. For example, the point located at the time when the switch operation is first performed by the user after the setting of the tilt angle detection mode is set as the point A, and the point located at the time when the switch operation is performed next is set as the point B. An inclination angle may be calculated. In that case, it becomes possible to detect the inclination angle of a desired section in a route where the gradient changes.
[0039]
(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described. FIG. 6 is a flowchart showing an operation related to the corrected azimuth angle obtaining process executed by the CPU 4 in accordance with the position measurement, for example, in the data obtaining apparatus 1 having the same configuration as FIG.
[0040]
When such an operation is started, the CPU 4 first starts position measurement processing, measures the current position by the GPS processing unit 3, and obtains the direction of its own traveling direction (step SE1). Here, when the azimuth in the traveling direction cannot be determined, for example, when the moving speed of the user is slow and there is no position change per unit time necessary for determining the azimuth based on the positioning information received from the GPS satellite (in step SE2). NO), the position measurement process is repeated. Even during this time, if the current position can be measured, it is displayed. Next, when the traveling direction can be determined in step SE1, as shown in FIG. 7, the magnetic north angle β with respect to the traveling direction A is determined (step SE3). Subsequently, after performing the azimuth measurement process by the magnetic sensor 14 (step SE4), the newly acquired angle γ with respect to the traveling direction of magnetic north C is determined (step SE5), and then the magnetic north angle β based on GPS and the magnetic sensor 14 is calculated and stored in the RAM 7 as a corrected azimuth angle (step SE6), and the process is terminated.
[0041]
On the other hand, FIG. 8 shows the direction executed by the CPU 4 when a predetermined button operation is performed by the user, for example, in a state where the processing described in FIG. 6 is performed and the corrected azimuth angle α is stored in the RAM 7. It is a flowchart which shows a display processing operation. In this operation, the CPU 4 first starts a direction measurement process by the magnetic sensor 14 (step SF1), and serves as a reference direction (in this embodiment, the 12 o'clock direction of the dial displayed on the display of the display circuit 5). ) Is determined in the magnetic north direction (step SF2). Next, the correction azimuth angle α stored in the RAM 7 is read and the following equation θ ′ = θ−α
After calculating the correction data angle θ ′ (step SF3), the dial displayed on the display (not shown) of the display circuit 5 indicates the direction that forms the correction data angle θ ′ with the 12 o'clock direction. An arrow for magnetic north display is displayed on (Step SF4), and the process is terminated.
[0042]
Therefore, even when an error for each product occurs in the direction measured by the magnetic sensor 14, an accurate display of the magnetic north direction is possible. Further, it is not necessary to adjust the error generated for each product before shipping the product. In the present embodiment, the corrected azimuth angle α is acquired in advance and stored in association with the position measurement. However, it is also possible to acquire the corrected azimuth angle α every time the azimuth display is performed. It is. However, in this case, since position measurement processing is required every time the azimuth display is performed, it is preferable to use the corrected azimuth angle α acquired and stored in advance as in the present embodiment. It is possible to extend battery life without consuming unnecessary power for display. In addition, accurate azimuth display can be performed even in a place where positioning information cannot be received. In the present embodiment, the correction azimuth angle α is always acquired when performing position measurement processing. However, the correction azimuth angle α is acquired automatically, for example, when position measurement is performed at the beginning of the day. Or only when requested by the user.
[0043]
In the correction azimuth angle acquisition process (FIG. 6) described above, the deviation angle α is calculated unconditionally and stored as the correction azimuth angle. For example, if the current location is a mountainous area, If it can be determined, or if the calculated deviation angle α is larger than the predetermined allowable range, the calculation result is discarded and the corrected azimuth angle acquisition process is terminated without storing the corrected azimuth angle. It may be. In that case, it is possible to avoid a situation in which the stored correction azimuth includes a large error due to geographical conditions or the like. As a result, higher accuracy can be ensured in the direction displayed in the subsequent direction display process.
[0044]
【The invention's effect】
As described above , according to the receiving device of claim 1, the first geological data based on the detected basic data is corrected by the second geological data based on the received positioning information, and this correction is performed. The acquired geological data can be used as acquired data. Therefore, more accurate geological data can be acquired. In addition, it is possible to reliably and promptly determine whether or not the current location is flat based on the stored topographic information.
[0045]
According to the receiving device of claim 2, the first geological data based on the detected basic data is corrected by the second geological data based on the received positioning information, and the corrected geological data is It can be acquired data. Therefore, more accurate geological data can be acquired. Further, when the correction condition determined according to the type of geological data to be acquired is satisfied, the first geological data can be corrected by the second geological data. The correction condition may be a condition that a difference between the first geological data and the second geological data is within a predetermined range.
[0046]
According to the data acquisition method of claim 3, the terrain information storage means storing the terrain information of each place is accessed, and based on the terrain information stored in the terrain information storage means, it is determined whether or not the current location is flat. When the present location is flat, the first altitude data acquired based on the basic data detected by itself is corrected by the second altitude data acquired based on the positioning information received from the satellite. The corrected data can be used as acquired data. Therefore, more accurate geological data can be acquired.
[Brief description of the drawings]
FIG. 1 is a block diagram of a data acquisition apparatus according to an embodiment of the present invention.
FIG. 2 is a flowchart showing an operation procedure of altitude measurement processing executed by a CPU according to the first embodiment of the present invention.
FIG. 3 is a flowchart showing an operation procedure of another altitude measurement process executed by the CPU in the second embodiment of the present invention.
FIG. 4 is a flowchart illustrating an operation procedure of a current position / altitude determination process executed by a CPU according to a third embodiment of the present invention.
FIG. 5 is a flowchart showing an operation procedure of an inclination angle detection process executed by a CPU in the fourth embodiment of the present invention.
FIG. 6 is a flowchart showing an operation procedure of a corrected azimuth angle acquisition process executed by a CPU in a fifth embodiment of the present invention.
FIG. 7 is a diagram showing a corrected azimuth angle α acquired in the same embodiment.
FIG. 8 is a flowchart showing an operation procedure of orientation display processing executed by the CPU in the embodiment.
[Explanation of symbols]
3 GPS processing unit 4 CPU
7 RAM
8 ROM
12 Direction detector 13 Altitude detector 14 Magnetic sensor 15 Pressure sensor

Claims (6)

A data acquisition device for acquiring geological data about the current location of the self,
Detecting means for detecting basic data used for obtaining the geological data;
Receiving means for receiving positioning information sent from a satellite;
The first geological data based on the basic data detected by the detecting means is corrected by the second geological data based on the positioning information received by the receiving means, and the corrected geological data is obtained as acquired data. Correction means, and
Terrain information storage means for storing terrain information of each place;
Position data acquisition means for acquiring position data indicating its current location based on the positioning information received by the reception means;
Determination means for determining whether or not the current location indicated by the current data acquired by the position data acquisition means is flat based on the terrain information stored in the terrain information storage means,
The correction condition is a determination by the determination means that the current location is a flat ground,
The correction means corrects the first geological data with the second geological data when a correction condition determined according to the type of geological data to be acquired is satisfied. Acquisition device. A data acquisition device for acquiring geological data about the current location of the self,
Detecting means for detecting basic data used for obtaining the geological data;
Receiving means for receiving positioning information sent from a satellite;
The first geological data based on the basic data detected by the detecting means is corrected by the second geological data based on the positioning information received by the receiving means, and the corrected geological data is obtained as acquired data. Correction means
The correction means corrects the first geological data with the second geological data when a correction condition determined according to the type of geological data to be acquired is satisfied,
The correction condition is a condition that a difference between the first geological data and the second geological data is within a predetermined range . In a data acquisition method for acquiring altitude data indicating the altitude of the current location, the terrain information storage means in which the terrain information of each place is stored is accessed, and the current location is flat on the basis of the terrain information stored in the terrain information storage means. whether the judged result of the determination, when the current position is flat, the first altitude data obtained on the basis of the basic data itself are detected, a second altitude obtained on the basis of the positioning information received from satellites A data acquisition method, wherein correction is performed using data, and the corrected data is used as acquisition data. 3. The data acquisition apparatus according to claim 1, wherein the correction unit performs correction for adding and averaging the second geological data to the first geological data. 4. The geological data, the data acquisition apparatus according to claim 1 or 2, characterized in that the altitude data indicating a high degree. The geological data, the data acquisition apparatus according to claim 1 or 2, characterized in that the orientation data representing an orientation.

Images