JPH01248084A - Apparatus for measuring own position - Google Patents

Abstract

PURPOSE:To measure a position within a short time, by identifying an approximate own position only by inputting the number of the pages of a map. CONSTITUTION:Optical fiber (m) groups 32, 33 arranged in a lattice pattern, an input key group 34 and a character display part 35 are provided on a transparent frame 31 having a space for arranging a map 50 and a display control circuit 36 is provided in the frame 31 while a replaceable external ROM 38 having data such as the number of the pages of the map 50, the coordinates of the origin of each page or the like is provided on the circuit 36. When the number of the pages of the map 50 is inputted from the key group 34, the approximate position of own position is searched from the number of the pages of the map by the control circuit 36 and the output thereof is inputted to the GPS control circuit of a GPS receiver 20. The circuit 22 sets the output of the circuit 36 as an initial position to determine a communications satellite to be received. The circuit 36 reads the present own position (latitude, longitude) from the circuit 22 not only to display the same on a display part 35 but also to allow the lines concerned of the fiber groups 32, 33 to emit lights.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a device for displaying the position of a moving object such as a car, a ship, or an aircraft, and is used in a navigation device or the like. Ru.

(Conventional technology) GPS (Global Positioning)
In order to accurately determine your position using
A combination of satellites with good data, satellite status, satellite placement, etc. is required.

One way to know which satellites are in the sky is to search by sequentially switching the C/A code corresponding to each satellite, but it takes a long time to search, so positioning takes time.

On the other hand, if you know your approximate position, the satellites in the sky at that time can be easily determined from the almanac data, so you can use the C/A code corresponding to the determined satellite to perform pseudo-range measurements and navigation message data. By performing demodulation, it becomes possible to measure one's own position in a short time.

This idea is, for example, published in Japanese Patent Application Laid-Open No. 61-200485.
Publication No. 11a4 is disclosed.

As a method of knowing the approximate self-position,
No. 85 uses a method in which an operator inputs data using an input keyboard.

(Problem to be Solved by the Invention) However, in order to know the general location of one's own location, it is necessary to know the latitude and longitude information of one's own location, but the latitude and longitude information of one's location cannot be found in a normal road atlas. Since these are not listed, a separate means for knowing the approximate latitude and longitude information of one's own position is required.

Therefore, in the present invention, when setting an initial position in a self-positioning device, a device and a device that can simply input rough latitude and longitude information of one's own position without knowing the rough latitude and longitude information of one's own position. The technical challenge is to do so.

[Structure of the invention]

(Means for solving the problem) The technical measures taken to solve the above technical problem are:
The self-location display device includes a frame having a space for installing an atlas, a transparent display placed within the frame, a setting means for setting the pages of the atlas, and a map of the page set by the setting means. an approximate position calculating means for determining the position of the general position calculating means; a position detecting means for determining a receivable communication satellite from the approximate position calculated by the approximate position calculating means and detecting the own position from the distance from the communication satellite; and setting by the setting means. The present invention further comprises a control circuit for displaying a graphic on the display based on the page displayed and the position detected by the position detecting means.

(Operation) According to the above technical means, when a page is set by the setting means, the approximate own position is determined from the map of the set page, and the communication satellites that can receive data are determined from this approximate own position. Then, its own position is measured by the communication satellite.

(Example) Hereinafter, an example in which the present invention is applied to a navigation device on a moving object will be described based on the drawings.

As shown in FIG. 1, this embodiment is comprised of an antenna 10, a GPS receiver 20, a display device 30, and an atlas 50. Antenna 10 is a known planar antenna. The GPS receiver 20 is a receiver that measures its own position using radio waves from three or four artificial satellites. The inside of the GPS receiver 20 includes a receiving section 21 and a GPS control path circuit 22. The receiving unit 21 is connected to the antenna IO, receives a signal from the GPS control circuit 22, and sends the received signal to the GPS*J control circuit 22. The GPS control circuit 22 includes the antenna 10 and the receiving section 2.
1 separates the received signal into orbit data and pseudorange, calculates its own latitude and longitude, and displays the display device 30 described later.
It is transmitted to the display control circuit 36 of. In this way, the antenna 10 and the GPS receiver 20 detect the current position.

The GPS control circuit 22 is a microcomputer unit and operates according to the flowchart shown in FIG. Details of the control of the cpS control circuit 22 will be explained with reference to FIG. When the GPS control circuit 22 starts, the memory inside the GPS control circuit 22 is cleared and set to the initial state (step 61).
). Thereafter, it waits for the initial self-position to be output from the display control circuit 36. When the display control circuit 36 outputs the initial self-position,
The GPS control circuit 22 inputs its initial own position (step 62), and selects a receivable satellite that should be above the initial own position from the almanac data stored in the memory (step 63). Next, the data of the selected satellite is transmitted to the receiving section (step 7164). The receiving section 21 performs reception from the satellite based on the satellite information received from the GPS control circuit 22. After receiving, the receiving unit 21 transmits the received data to the GPS control circuit 22. The GPS control circuit 22 manually receives the data received from the receiving unit 21 (step 65), demodulates the data, and measures the distance from the pseudo point (step 66). Next, the reception condition of each satellite is investigated (step 67), and a combination of satellites for self-positioning is determined from among those with good reception conditions (step 68). After this, a navigation equation is created and the own position is calculated (step 69). Then, the positioning result of the own position is output to the display control circuit 36 (step 70), and the positioning result is used as the initial own position for the next measurement (step 71). After this, steps 63 and subsequent steps are repeated.

2a and 2b show an embodiment of the display device 30. FIG.

In this display device 30, optical fiber groups 32 and 33, an input key group 34, and a character display section 35 are arranged on a frame 31. Further, a display control circuit 36 is built into the frame 31. An external ROM 38 is provided on the display control circuit 36.
is attached removably. This external ROM38
1137 on the frame 31 is opened/closed so that the operator can freely replace it. This external ROM2S
is the number of pages in a given atlas, as described below.

Data such as the coordinates of the origin of each page is stored.

The optical fiber groups 32 and 33 are arranged in a grid pattern on the frame 31 so as to be perpendicular to each other. Further, at one end of each of the optical fibers of the optical fiber groups 32 and 33, a light emitting diode of each of the light emitting diode groups 40 and 41 is disposed (see FIG. 3a). The light emitting diode groups 40 and 41 are mounted on a substrate 42 disposed within the frame 31, as shown in FIGS. 3a and 3b. The substrate 42 has optical fiber groups 32 and 33.
A V-shaped groove 42a is provided for positioning, and fixes the optical fiber groups 32 and 33. In addition, in order to protect the optical fiber groups 32 and 33, two transparent plates 3 are installed so as to sandwich the optical fiber groups 32 and 33 from above and below.
9 and 43 are arranged on the frame 31.

Each optical fiber of the optical fiber groups 32 and 33 ~
A part of the cladding is roughened, and the cladding diffusely reflects light to emit light. Therefore, when each one of the light emitting diode groups 40 and 41 is turned on, light appears to be emitted from the optical fiber in a cross shape as shown in FIG.

Input key group 342 character display section 35 of the above-mentioned display device 30
5 light emitting diode groups 40 and 41. External ROM38. and the display control circuit 36 are connected by a circuit shown in FIG. The input key group 34 includes a numeric keypad 34a and a setting key 34b. In addition, the character display section 35 is an LC
It is composed of a D (liquid crystal display) 35a and an LCD i control circuit 35b. The LCD control circuit 35b controls the LCD 35a in response to a signal from the display control circuit 36 to display alphanumeric characters, Chinese characters, etc.

The display control circuit 36 includes a CPU 36a which is a microcomputer unit, and known LBD%lK operating circuits 36b and 36c for lighting the light emitting diode groups 40 and 41. The CPU 36a operates based on the flowchart shown in FIG.

The operation of the CPU 36a will be explained with reference to FIG. First, when the CPU 35a starts, the memory and input/output board in the CPU 36a are initialized (step 80). Next, the page of the open atlas is input using the input key group 34 (step 81). Step 83) Search for your approximate location from the page number of this atlas and the page-coordinate conversion table described later.
Approximate position data of the own position is output to the GPS control circuit 22 of the receiver 20. The approximate position of the user's position may be, for example, point A or point B in FIG. 7, or a position intermediate between point A and point B may be calculated. As mentioned above, the GPS control circuit 22
Then, the receiver uses the obtained rough position data as the initial position and determines the communication satellite to be received.

Then GPS? 1Ill? Current self position from 111 circuit 22.

In other words, it reads latitude and longitude. (Step 85)
. The latitude and longitude are output to the character display section 35 (step 86), and the character display section 35 displays the latitude and longitude on the LCD 35a. After this, optical fiber group 3
A search for an optimal line is performed to determine which optical fiber among 2 and 33 is to be lit (step 87).

The external ROM 38 stores a page-coordinate conversion table as shown in FIG. 8, which shows the coordinates of point A, which is the origin of each page, and point B, which is the maximum point (see FIG. 7). The optimal line is determined from this table and the current latitude and longitude of the user read from the GPS receiver 20. Next, an example of a method for searching for an optimal line will be described. The coordinates of point A are (Ax
, Ay), when the coordinates of point B are (Bx, By) and the coordinates of the self are (X, Y), the line to be lit is latitude: <Ax-X)/(Ax-Bx)X (1+1 ) is rounded off to the nearest whole number, and the longitude is (Ay-Y)/
The line corresponds to the value obtained by rounding off (Ay-By)X (J+1). (Here, ■ is the number of optical fiber groups 32 indicating longitude, and J is the number of optical fiber groups 33 indicating latitude.) After this, the LED drive circuit is activated to light up the light emitting diodes corresponding to the optimum line. 36
b and 36C (step 88). The above optimal line search method can also be performed by storing the scale of the map of the page in place of the maximum point B in the external ROM 38.

In the above embodiment, after the operator operates the device, the operator sets the atlas and inputs the page, and the approximate position of the operator is automatically sent to the GPS control circuit.

The input key group 34 is used to input the type of atlas in order to support multiple types of atlases.

FIG. 9 shows another embodiment of the invention. Here, a barcode 52 is printed on the atlas 50.

Further, a barcode reader 43 is arranged on the back side of the display device 30. The barcode 52 is coded with the page number of the atlas. According to this, in the embodiment of FIG. 1, the trouble of manually entering the page numbers of the map can be saved,
Even easier to use.

〔Effect of the invention〕

According to the present invention, since the measurement of one's own position is performed by a communication satellite selected based on the approximate one's own position, there is no need to communicate with all the communication satellites and check whether reception is possible or not, so positioning can be done in a short time. can.

At this time, the approximate location is determined by setting the page number, so
You can easily search for your approximate location without knowing your latitude and longitude. Also, input is easy. Furthermore,
If you prepare a barcode on the atlas and a barcode reader on the frame, you can search for the approximate position 1 even more easily and quickly. Therefore, this is advantageous when it is desired to know the accurate own position immediately after starting positioning.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a navigation device that is an embodiment of the present invention. 2a and 2b are an external view and a sectional view of the display device of the navigation device of FIG. 1. FIG. Figures 3a and 3b are partial cross-sectional views of the display device of Figure 2a. FIG. 4 is a circuit diagram of a display control circuit of the display device of FIG. 2a. FIG. 5 is a flow chart of the GPS control circuit of FIG. FIG. 6 is a flow chart of the display control circuit of FIG. FIG. 7 is a diagram showing an example of use of the display device of FIG. 2a. FIG. 8 is a page-coordinate table showing the coordinates of point A, which is the origin, and point B, which is the maximum point, of each page stored in the external ROM shown in FIG. FIG. 9 is a configuration diagram of a navigation device according to another embodiment of the present invention. 10... Antenna (position detection means), 20... GP
S receiver (position detecting means), 21... Receiving unit, 22... GPS control circuit, 30... Display device (own position display device), 31... Frame (frame), 32.33. ...Optical fiber group (display), 3
4... Input key group, 34a... 10 keys (setting means, keyboard), 34
b...setting key (setting means, keyboard), 35...
-Character display section (character display means), 35a...LCD. 35b...LCD control circuit, 36...Display control circuit (approximate position calculation means, control circuit), 36a...-CPU. 36 b, 36 c・LED drive circuit, 37... Lid, 38... External ROM. 39.43...Transparent plate, 40.41...Light emitting diode group (display),
42... Substrate, 42a... V-shaped groove, 43
...Barcode reader Ctj? (foot means, barcode reader), 50...atlas, 52...barcode (setting means, barcode). Figure 7 Figure 8

Claims (3)

[Claims] (1) A frame having a space for installing an atlas, a transparent display placed within the frame, a setting means for setting the pages of the atlas, and an approximate location of the page set by the setting means from the map. An approximate position calculation means to seek, a position detection means for determining a receivable communication satellite from the approximate position calculated by the approximate position calculation means, and detecting the own position from the distance to the communication satellite, a page set by the setting means. and a control circuit that displays a graphic on the display based on the position detected by the position detection means;
A self-position display device comprising: (2) The self-location display device according to claim (1), wherein the setting means includes a keyboard, and sets a number typed on the keyboard as a page number. (3) The setting means includes a barcode printed on each page of the atlas and encoded with the page number, and a barcode reader disposed in the frame, and the value read by the barcode reader. The self-location display device according to claim 1, wherein the self-location display device sets the number of pages as the number of pages.