JPS63223587A - Gps navigation device - Google Patents

Abstract

PURPOSE:To exactly detect and confirm the present position of a moving body by using a beacon radio wave, when it has been decided that there are three pieces of usable artificial satellites. CONSTITUTION:When it is decided that there are three pieces of artificial satellites which can receive a radio wave, whether a beacon radio wave has been received or not is decided by a beacon reception deciding part 43 in a data processing/communication control part 41. In this case, when it has been decided to be YES, accordingly, based on the contents of a radio wave signal by which the beacon radio wave has been received from a beacon use antenna 11 to a beacon receiving part 12, a two-dimensional coordinate data against the present position of a moving body is obtained. Subsequently, based on the two-dimensional data obtained in such a way, and a position measuring data due to a fact that a GPS satellite radio wave has been received, the altitude of the moving body is calculated. The obtained altitude data is stored in a data storage part 5.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a GPS navigation device for various types of moving objects, and particularly to a GPS navigation device that can be used in a plurality of satellites that constitute a GPS. The present invention relates to a GPS navigation device that can accurately detect the current position of a moving object even when the current position of a moving object is insufficient.

[Prior Art] Radio waves are transmitted from multiple artificial satellites to various types of moving objects such as ships, aircraft, and automobiles in order to confirm or determine their current positions, moving speeds, etc. The usefulness of GPS positioning devices has been attracting attention1. Here, GPS positioning devices refer to the Global Positioning System (Grob
al Positioning S-system)
It is designed to receive radio waves from multiple artificial satellites that belong to the same area, and to determine the current location of a mobile object.

As is conventionally known, positioning operations performed using such a GPS positioning device are usually performed by receiving radio waves from three or four artificial satellites. Then, the radio waves from the plurality of satellites are simultaneously received by the mobile object, and the difference in accuracy between the clock devices installed on the plurality of satellites and the clock device installed in the mobile object is detected. The current position of the moving object is displayed on an appropriate display means after the necessary correction processing for the time lag based on the above is performed. At this time, the necessary map information is displayed on the display means, superimposed on the information regarding the current position.

FIG. 3 is a block diagram showing a conventional GPS navigation device. In FIG. 3, (1) is a GPS antenna for receiving satellite radio waves, and the output side of this GPS antenna (1) is connected to a GPS receiving section (2). The pseudorange data obtained by this GPS receiver (2) is introduced into a position calculator (3). The position calculator (3) calculates accurate longitude, latitude, and altitude based on the pseudorange data described above, and as a result, the accurate current position of the moving object is detected. The data regarding the current position obtained in this manner is then stored in the data storage section (5) via the data processing section (4). Note that the display unit (6) includes a display means such as a CRT, which visually displays a related map and the current position of the moving object in an overlapping manner, for example. A GPS navigation device having such a configuration is activated, for example, by operating a suitable function key such as a start key on a keyboard (not shown). After entering the operating state in this manner, radio waves from a plurality of artificial satellites are received by the GPS antenna (1). The GPS receiving unit (2) measures the pseudo distance to each artificial satellite based on the radio waves received in this way, and supplies the corresponding pseudo distance data to the position calculator (3) for 0 position calculation. The device (3) calculates the longitude, latitude, and altitude regarding the current position of the moving body based on the pseudorange data, and stores the calculation results in the data storage unit (
5). The data processing unit (4) also retrieves required map information from a map storage unit (not shown) and displays it on the display unit (6) by superimposing it on the current position of the mobile object. Various necessary data processing is performed. Thus, the position information of the moving object such as the current position, moving speed, heading direction, etc. from the data storage section (5) and the map information for the moving object corresponding to the moving route are displayed on the display section (6). will be displayed superimposed on the screen.

By the way, when such an operation is performed, depending on the current position of the mobile object, the number of artificial satellites that can receive radio waves may be three or four. When radio waves from three satellites can be received, the current position of the mobile object can be determined two-dimensionally, and when radio waves from four satellites can be received, the altitude can be determined. However, when the number of usable satellites is three, accurate altitude cannot be obtained, so the current position of the moving object cannot be determined. Difficult to detect and confirm with high precision.

[Problems to be Solved by the Invention] Since the conventional GPS navigation device is configured and operates as described above, when the number of usable artificial satellites is three, it is possible to determine the current position of a moving object. The problem is that it is difficult to detect and confirm with high precision.

This invention was made to solve the above-mentioned problems, and when the number of usable artificial satellites is three, it is possible to determine the current position of a mobile object by using receivable beacon radio waves. The purpose of the present invention is to obtain a GPS navigation device that can accurately detect and determine the

[Means for Solving the Problems] A GPS navigation device according to the present invention includes a GPS antenna (1) that receives radio waves from an artificial satellite constituting a GPS, and a GPS antenna (1) that is connected to the GPS antenna (1). a GPS receiving section (2); and a position calculating section (3) that calculates position information of a moving object based on the output signal from the GPS receiving section (2).
, a beacon antenna (11) for receiving beacon radio waves, a beacon receiving section (12) connected to the beacon antenna (11), and a data storage section (5) for storing various data. and the position calculation section (3)
a data processing/communication control unit (41) for performing necessary processing on the results of calculations in and the required data retrieved from the data storage unit (5), and controlling communication with the beacon reception unit (12); ) and a display unit (6) for displaying required content, and the data processing/communication control unit (41) includes a number determination unit (42) for determining the number of usable artificial satellites. and a beacon reception determination section (43) that determines whether or not beacon radio waves can be received.

[Operation] In the present invention, when it is determined that there are three usable artificial satellites, the current position of the moving body is detected and determined by using receivable beacon radio waves.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure is a block diagram showing a GPS navigation device that is an embodiment of the present invention. In FIG. 1, a beacon antenna (11) for receiving beacon radio waves is connected to a beacon receiving section (12), and this beacon receiving section (12) is connected to a data processing/communication control section (41). It is connected. In addition, this data processing/communication control unit (41)
includes a number determining unit (42) for determining the number of usable artificial satellites, and a beacon reception determining unit (42) for determining whether beacon radio waves can be received.
43) is provided. In addition, in this Figure 1,
Items with symbols similar to those in Figure 3 above are:
It indicates something that is the same as or equivalent to them.

Further, FIG. 2 is a flowchart diagram for explaining the operation of the above embodiment.

Next, the operation of the above embodiment will be explained based on FIGS. 1 and 2. Now, for example, by pressing a predetermined function key on the keyboard (not shown), the device enters the startup state (SO) and receives radio waves from multiple satellites that make up the GPS (Sl). . Here, the number of artificial satellites that can receive radio waves is determined (S2). This determination operation is performed by the number determination unit (42) included in the data processing/communication control unit (41). Assuming that it is determined that there are currently three artificial satellites that can receive radio waves, the process moves to step (S3) where it is determined whether or not beacon radio waves have been received. /Performed by the beacon reception determination unit (43) in the communication control unit (41), where:
When it is determined as YES, that is, the beacon radio waves are transmitted from the beacon antenna (11) to the beacon receiver (12).
When received by the beacon receiver (12) and transmitted to the data processing/communication control unit (41), the beacon receiver (12) determines whether the received radio signal corresponds to the current position of the mobile object based on the content of the received radio signal. Two-dimensional coordinate data is acquired (S4), and then, based on the two-dimensional data acquired as described above and positioning data obtained by receiving GPS satellite radio waves,
The altitude of the moving object is calculated (S5). The altitude data obtained in this way is stored in the data storage unit (5) (S6), but this is based on the content of the beacon radio signal and is a two-dimensional data that corresponds to the current position of the mobile object. position(
This is done by specifying an address that has some kind of relationship with the beacon location.

On the other hand, when the result of the determination in step (S3) is NO, steps (S4), (S5), and (S6) are skipped, and the next step (S7) is performed.
to move to.

On the other hand, when it is determined that there are four usable satellites in step (S2), step (S2)
St^), it is determined whether or not a beacon radio wave has been received. And the result of that judgment is YES,
If it is, the process moves to step (51B) and the G
Altitude data obtained based on reception of PS satellite radio waves (Sl) is stored at a predetermined address in the data storage section (5). On the other hand, if the above-described determination result is No, this step (SIB) is skipped and the process moves to the next step (S7).

Next, in step (S7), the latitude and longitude corresponding to the two-dimensional current position plane of the moving body are calculated. Then, the current position of the moving body calculated in this way is displayed on the display section (6) (S8), and then the overall operation ends (S9).

[Effects of the Invention] As explained above, the GPS navigation device according to the present invention is a GPS navigation device that receives radio waves from artificial satellites that constitute a GPS.
PS antenna (1) and the GPS antenna (1)
a GPS receiving section (2) connected to the GPS receiving section (2), a position calculating section (3) that calculates the position information of the mobile body based on the output signal from the GPS receiving section (2), and a beacon for receiving beacon radio waves. a beacon receiving section (12) connected to the beacon antenna (11), a data storage section (5) for storing various data, and a position calculation section (3). Necessary processing is performed on the calculation results and the required data retrieved from the data storage section (5), and the beacon reception section (5)
a data processing/communication control unit (41) for controlling communication with 12), and a display unit (6) for displaying required content.
), the data processing/communication control unit (41) includes a number determination unit (42) for determining the number of usable artificial satellites, and a beacon for determining whether or not beacon radio waves can be received. Since it has a configuration in which a reception determination section (43) is provided, if a beacon radio wave can be received when the number of usable artificial satellites is three, this beacon radio wave can be received. This brings about the effect that the current position of the moving body can be detected and determined more accurately.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a GPS navigation device according to an embodiment of the present invention, FIG. 2 is a flowchart for explaining the operation of the above embodiment, and FIG.
FIG. 2 is a block diagram showing a PS navigation device. (1) is a GPS antenna, (11) is a beacon antenna, (2) is a GPS receiving section, (12) is a beacon receiving section, (3) is a position calculation section, (4) is a data processing section, (4)
1) is a data processing/communication control section, (42) is a number determining section, (43) is a beacon reception determining section, (5) is a data storage section, and (6) is a display section. In addition, in the figures, the same reference numerals refer to the same or corresponding parts.

Claims (1)

[Claims] (1) A GPS antenna that receives radio waves from the artificial satellites that make up the GPS, a GPS receiver connected to the GPS antenna, and a GPS receiver that receives position information of a moving object based on the output signal from the GPS receiver. a position calculation unit for calculating, a beacon antenna for receiving beacon radio waves, and a beacon reception unit connected to the beacon antenna;
A data storage unit for storing various data, and performs necessary processing on the results of calculations in the position calculation unit and required data retrieved from the data storage unit, and controls communication with the beacon reception unit. A GPS navigation device consisting of a data processing/communication control unit for determining the number of usable artificial satellites, and a display unit for displaying required contents, the data processing/communication control unit determining the number of usable artificial satellites. A GPS navigation device, comprising: a number determining section for determining whether beacon radio waves can be received; and a beacon reception determining section for determining whether or not beacon radio waves can be received.