JPH0118390B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a positioning device that selectively uses a plurality of radio navigation methods.

(Technical Background of the Invention) There are various methods of radio navigation, and the measurable area and measurement accuracy vary depending on the type. Depending on the measurement area, the radio navigation method that provides the best accuracy is selected for measurement. There is a need.

Furthermore, in inexperienced or unfamiliar sea areas, it is easy to make mistakes in this selection, often resulting in positioning with large measurement errors.

An object of the present invention is to provide a measuring device that can eliminate such errors and perform the best positioning even in inexperienced or unfamiliar sea areas.

(Structure and operation of the invention) A radio navigation positioning means 1, B radio navigation positioning means 2, C radio navigation positioning means 3, and D radio navigation positioning means 4 are positioning means using radio waves of different radio navigation systems, For example, the current position is measured by receiving radio waves from NNSS (Satellite Radio Navigation System), Omega Radio Navigation System, Loran C Radio Navigation System, Detsuka Radio Navigation System, etc., and the signal represents the positioning value converted into latitude and longitude values. and a signal representing the code of the navigation system, respectively.
They are output as a, B positioning signals 2a, C positioning signals 3a, and D positioning signals 4a.

When the radio waves of the navigation system include a malfunction signal such as a station failure signal, this means outputs the signal or a coded signal thereof as the navigation positioning signal.

●The selection means 5 selects one of the positioning signals 1a, 2a, 3a, and 4a according to the designation signal 6a described later.
One of the designated positioning signals is selected and outputted as the selected positioning signal 5a, for example, the third
This is selection means that will be described later with reference to the drawings.

This means automatically selects one of the A navigation positioning signal 1a, B navigation positioning signal 2a, C navigation positioning signal 3a, and D navigation positioning signal 4a from which a positioning signal is obtained when the device is started up. Alternatively, the positioning signal of the navigation system specified by a later selection signal 9a to be described later is selected and output.

●The area determination means 6 uses the position value of the selected positioning signal 5a, that is, the latitude and longitude value as the verification signal 7a, using each navigation system A, B, C, and D stored in the area storage means 7 described later. Read out the readout signal 7b representing the area value, compare this with the selected positioning signal 5a, and designate any one navigation system, for example, the C radio navigation system,
This is outputted as a designation signal 6a, and is, for example, a calculation means as described later with reference to FIG.

●The area storage means 7 stores each navigation system A, B,
The contour value of the area where C and D can be positioned with the best accuracy, theoretically or actually measured, is used as the usage area value, and the usage accuracy of each navigation system A, B, C, and D in the area where the usage areas overlap. A memory that stores the ranking of quality as an accuracy ranking value.
A signal representing the memory contents read out using the collation signal 7a is output as the readout signal 7b.For example, these values are stored in a ROM (readout (dedicated memory), and storage/reading means as will be described later with reference to FIG.

- The display means 8 displays the contents of the selected positioning signal 5a, for example, displays latitude and longitude values and the name of the navigation system from which the positioning was obtained using an LED character display circuit.

●The initial setting means 9 sets the exact latitude and
A means for setting the longitude value or the name of the navigation system to be selected in the region determining means 6 or the selecting means 5 and quickly performing the initial operation of startup, for example,
It is a combination of a keyboard circuit and a code conversion circuit for inputting these, and outputs latitude and longitude values as an initial area signal 9b, and a signal specifying a navigation system name, for example, C radio navigation, as an initial selection signal 9a. .

This initial setting means 9 may be provided as necessary. Also, by using this means, a navigation system other than the navigation system designated by the designation signal 6a is designated, and the positioning value of the navigation system is temporarily set. It can also be displayed.

Next, a specific example of the components of the selection means 5, area determination means 6, and area storage means 7 will be described.

In FIG. 3, the selection means 5 includes the gate group 101 and the register 1.
The designation signal 6a is taken into the register 102, and the designation signal 6a is
Gate signals 102a to 102 according to the specifications of
d, for example, the gate signal 102c, and opens the corresponding gate circuit to gate the positioning signal of the designated navigation system, that is, the C navigation positioning signal 3a. , and outputs this as the selected positioning signal 5a.

This gate group 101 is used when starting the device.
After opening all the gates and allowing one of the A navigation positioning signal 1a, B navigation positioning signal 2a, C navigation positioning signal 3a, and D navigation positioning signal 4a from which a positioning signal is obtained to pass through, or After opening the gate specified by the initial selection signal 9a and outputting the positioning signal of the specified navigation system as the selected positioning signal 5a, the specified signal 6 is
Start the selection operation by a.

●The region determination means 6 is composed of a determination circuit 103 that is a combination of registers, memories, comparators, etc., or an addition/subtraction calculation circuit using a microprocessor (CPU), and transmits the selected positioning signal 5a to a register 103A (not shown). ), and based on this content, a signal for reading out the storage contents of the corresponding area storage means 7, for example, a read address signal of the area storage means 7, is sent to the collation signal 7.
Output as a.

Then, the readout signal 7b read out by the collation signal 7a is stored in another register 103B (not shown).
and register 103A and register 10.
3B is compared by a comparator 103C (not shown), and the value of the register 103A exceeds the value of the register 103B, that is, the usage area value (the value of the usage area section, which will be described later with reference to FIG. 5). If it exceeds the value, it is repeatedly compared with the next usage area value to detect the corresponding usage area and calculate the accuracy of each navigation system A, B, C, and D in that usage area. Ranking, e.g. 1st place: C, 2nd place: B, 3
The signal for designating the navigation system is gated and outputted as a designation signal 6a according to the order of rank: A, fourth rank: NONE.

That is, first, a designation signal 6a designating the first-ranked navigation system C is issued, and then a gate signal 102c is issued.
If the selected positioning signal 5a (in this case, the content of the C navigation positioning signal 3a) contains a fault signal such as a station failure signal,
A designation signal 6a designating the next second-ranked navigation system B is output, and so on, a determination is made to output a positioning signal without any problems while lowering the ranking.

●The area storage means 7 is an address register 10
4. It is composed of a combination of a read-only memory 105 that stores usage areas and accuracy rankings, and the memory contents of the memory 105 are such that the usage areas of each navigation system A, B, C, and D are as shown in Figure 2. If the contour lines A1, B1, C1, and D1 of each usage area are arranged in units of latitude or longitude, for example, the longitude values are plotted in units of 1' of latitude, as shown in Fig. 4. The content is divided into sections as shown in FIG. The corresponding storage contents are read out and output as a read signal 7b.

Regarding the relationship between the memorization method in Figure 4 and the usage area in Figure 2, the north latitude N and south latitude S in Figure 2 are as follows.
is converted into latitude data for each 1' unit as the "read address value", and the corresponding "usage area (1) to (6)" is set for each latitude line of each value of this latitude data. The values of east longitude E and west longitude W at each intersection of the contour lines A1, B1, C1, and D1 of each usage area of each navigation system A, B, C, and D are taken as the "section left longitude," and from each point, Each navigation system A, B, in the section to the point on the right side of the point
The ranking of the usage accuracy of C and D is used as the "accuracy ranking" of that section and is used as the data of the stored content.

(Effect of the Invention) According to the present invention, the current positioning value during positioning by any of the navigation systems is automatically compared and determined by the area determination means 6 with the storage position value of the area storage means 7, and the area storage means 7 Since the selection means 5 selects the positioning value of the navigation system with the best positioning accuracy according to the accuracy ranking stored in the navigation system, the positioning value with the best accuracy is always automatically displayed even in inexperienced or unfamiliar sea areas. It has the feature of being able to

(Modified implementation of the invention) (1) Without providing separate latitude/longitude coordinate conversion models in A radio navigation positioning means 1, B radio navigation positioning means 2, C radio navigation positioning means 3, and D radio navigation positioning means 4. , this is performed using a common coordinate transformation function, and this function and the functions of the area determination means 6 and area storage means 7 are integrated into one microprocessor (CPU).
Let it be done.

(2) Inputting the selection function by the selection means 5 to the coordinate conversion function of the above item (1) in each navigation and positioning means 1, 2, 3, and 4 without selecting the signal converted to latitude and longitude values. The measured signals of each navigation system are
For example, a signal representing a time difference measurement may be selected.

(3) The selection function of the selection means 5 is made to select the operating power input of each navigation and positioning means 1, 2, 3, and 4 without selecting the signal converted to latitude/longitude value, so that the selected one is selected. Only one navigation and positioning means is operated.

(4) Navigation methods such as NNSS, where radio waves are only occasionally obtained and high accuracy can be obtained only at those times, or those that are supplemented by coordinating with other navigation methods during the periods when radio waves are not available. One of the positioning means
For example, when used as A radio navigation positioning means 1, a signal indicating that positioning has been obtained by the radio wave, or a period during which relatively high accuracy is expected to be obtained from the time when the positioning was obtained. A means is added for outputting the signal as the temporary selection signal 1b, and outputting this positioning signal preferentially as the selection positioning signal 5a only at that time or period.

(5) Data in which the read address of the area storage means 7 is set in the longitude direction and the interval value is set in the latitude direction is set as the stored content.

[Brief explanation of drawings]

The drawings show an embodiment, and FIGS. 1 and 3 are schematic diagrams of the block configuration, FIG. 2 is a schematic diagram of the block configuration of the main part specific circuit, and FIG. 4 is a memory diagram. 1: A radio navigation positioning means, 2: B radio navigation positioning means, 3: C radio navigation positioning means, 4: D radio navigation positioning means, 5: selection means, 6: area determination means,
7: Area storage means, 8: Display means, 9: Initial setting means.

Claims (1)

[Scope of Claims] 1. A positioning device comprising positioning means for obtaining positioning signals representing current position values using a plurality of radio navigation systems, and display means for selecting and displaying one of the positioning signals, comprising: means for storing each usage area value and accuracy ranking of the radio navigation system; and comparing the position value of the positioning signal output for the display with the usage area value to determine the accuracy ranking at the position. A positioning device comprising: a means for determining; and a means for making the selection based on the determined accuracy ranking, thereby making it possible to automatically select and display highly accurate position values.