JP3662078B2 - GPS receiver - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
According to the present invention, it is possible to select either normal GPS (Global Positioning System) positioning or DGPS (differential GPS) positioning according to user settings. Even when DGPS is selected, two-dimensional positioning or three-dimensional positioning is possible. The present invention relates to a GPS receiver capable of selecting positioning.
[0002]
[Prior art]
There is GPS as a means for measuring the position and speed of a ship or the like, but in normal GPS, since the positioning accuracy is about 100 m with a C / A code, DGPS is used to improve the positioning accuracy. In general GPS receivers, a configuration in which a normal GPS positioning or a DGPS positioning can be selected by a user setting has been developed.
[0003]
As is well known, DGPS receives a positioning signal from a satellite at a reference station whose position is accurately known in advance, and calculates an error component of the pseudorange from the positioning information obtained from this positioning signal and the actual position. Then, it is transmitted to the user as correction data.
The GPS receiver is a system that corrects with this correction data and outputs relatively accurate positioning information (positioning accuracy is about several meters). Depending on the number and arrangement of GPS satellites, only two-dimensional positioning can be performed. The situation changes, such as whether original positioning is possible.
Therefore, even a GPS receiver that can use DGPS can select either normal GPS positioning or DGPS according to user settings. Even when DGPS is selected, two-dimensional positioning, three-dimensional positioning, or two Generally, it is configured to be able to distinguish and set whether AUTO positioning automatically selects dimensions to three dimensions.
[0004]
[Problems to be solved by the invention]
However, with this type of conventional GPS receiver, even if DGPS is selected and positioning with DGPS, if the user has set two-dimensional positioning, two-dimensional positioning is possible even if three-dimensional positioning with good positioning accuracy is possible. Will be done.
If 3D positioning is not possible even if the user has set 3D positioning, a message indicating that positioning is not possible will be displayed, or 2D positioning data will be output as 3D positioning data. Therefore, there are problems such as inconvenience and misunderstanding for users.
The present invention has been made to solve such problems.
[0005]
[Means for Solving the Problems]
The GPS receiver according to the present invention is a GPS receiver that can set a positioning mode of any one of two-dimensional positioning, three-dimensional positioning, or automatic positioning that automatically selects two-dimensional to three-dimensional using DGPS . Positioning calculation means for acquiring information on the number and arrangement of GPS satellites, and a currently set positioning mode, and an appropriate positioning mode obtained from information on the number and arrangement of current GPS satellites acquired by the positioning calculation means; By means of collation, a determination means for determining whether or not the currently set positioning mode is appropriate, and a display means for displaying whether the two-dimensional positioning or the three-dimensional positioning is currently performed by the AUTO positioning are provided. The apparatus itself automatically changes to AUTO positioning when it is determined by the determining means that the currently set positioning mode is not appropriate .
Accordingly, appropriate mode positioning information can be obtained even by a user without knowledge.
Moreover, the determination means sets the 3D positioning mode when the 2D positioning mode is currently set even though the 3D positioning mode is appropriate, or the 2D positioning mode is appropriate. It is determined that the mode setting is not appropriate mode setting.
Furthermore, it is a device that can use both normal GPS and DGPS.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a main configuration of a GPS receiver according to the present invention.
In the figure, reference numeral 11 denotes a positioning mode setting / display unit. This positioning mode setting / display unit 11 is displayed when the user sets a positioning mode, that is, “GPS” or “DGPS” and DGPS. It comprises a setting unit for setting any one of “two-dimensional positioning”, “three-dimensional positioning”, or “AUTO positioning”, and a display unit for displaying the set mode.
[0007]
Reference numeral 12 denotes a positioning mode detection unit which detects a mode set by the positioning mode setting / display unit 11 and the set mode is “DGPS” and “two-dimensional positioning” or “three-dimensional positioning” is set. Only in this case, this information is output to the determination unit 13.
Reference numeral 13 denotes a determination unit. When “two-dimensional positioning” or “three-dimensional positioning” is set by DGPS according to information from the positioning mode detection unit 12, the number of GPS satellites at that time sent from the positioning calculation unit 15 and It is determined whether or not the mode setting is appropriate in light of the satellite arrangement information.
[0008]
If it is not valid, the positioning mode switching unit 14 is operated to automatically (forcibly) switch the mode to “AUTO positioning”, send this instruction to the positioning calculation unit 15, and inform the user of the positioning mode. In addition, an indication of whether the current positioning is “two-dimensional positioning” or “three-dimensional positioning” is added.
Reference numeral 15 denotes a positioning calculation unit which calculates positioning data from positioning signals from a plurality of satellites received by the receiving unit 16 in a positioning mode indicated by the positioning mode switching unit 14 and information on the number and arrangement of satellites. Is output to the determination unit 13.
[0009]
Since the GPS receiver of the present embodiment is configured as shown in FIG. 1, even if “DGPS” is set to “two-dimensional positioning”, more accurate three-dimensional data can be obtained from the number and arrangement of GPS satellites. When positioning is possible, the setting mode is automatically (forced) changed to “AUTO positioning”, and the positioning mode setting / display unit 11 displays the current positioning mode (two-dimensional or three-dimensional). Added.
Even if “3D positioning” is set in “DGPS”, if 3D positioning is difficult due to the number and arrangement of GPS satellites, the setting mode is automatically (forced) changed to “AUTO positioning”. Then, a display indicating the current positioning mode (two-dimensional or three-dimensional) is added to the positioning mode setting / display unit 11.
[0010]
As GPS receivers become more widespread, they are widely used even by those who do not have knowledge of positioning mode, etc., and it is not possible to make an appropriate judgment when setting the positioning mode. There are many cases where the user forgets to change the setting mode.
The GPS receiver of the present invention automatically changes this when the inappropriate mode is selected in DGPS, and displays it so that the user can know that the change has been made. It becomes possible to provide positioning information with as high accuracy as possible.
[0011]
【The invention's effect】
As described above, the GPS receiver of the present invention automatically changes to AUTO positioning when the set positioning mode is inappropriate when 2D positioning or 3D positioning is set during DGPS positioning. Thus, positioning information in an appropriate mode can be obtained even by a user without knowledge.
In addition, when the positioning mode is automatically changed to AUTO positioning, since the display of the current positioning mode is also added, there is an effect that the user does not mistake the current positioning mode.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a main configuration of a GPS receiver according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Positioning mode setting and display part 12 Positioning mode detection part 13 Determination part 14 Positioning mode switching part 15 Positioning calculation part 16 Receiving part

Claims (3)

In a GPS receiver that uses DGPS (differential GPS) and can set a positioning mode of either 2D positioning, 3D positioning, or AUTO positioning that automatically selects 2D-3D,
Positioning calculation means for obtaining information on the number and arrangement of GPS satellites;
The currently set positioning mode is appropriate by comparing the currently set positioning mode with an appropriate positioning mode obtained from the information on the number of GPS satellites and the arrangement obtained by the positioning calculation means. Determination means for determining whether or not
And Table Shimesuru display means we are doing or three-dimensional positioning is currently performing a two-dimensional positioning in the A UTO positioning,
The GPS receiver is characterized in that the apparatus itself automatically changes to AUTO positioning when it is determined by the determining means that the currently set positioning mode is not appropriate . The determination means is configured such that when the two-dimensional positioning mode is currently set even though the three-dimensional positioning mode is appropriate, or when the two-dimensional positioning mode is appropriate, the three-dimensional positioning mode is set. The GPS receiver according to claim 1, wherein it is determined that the mode setting is not appropriate . The GPS receiver according to claim 1 or 2 , wherein both a normal GPS and a DGPS can be used.

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