WO2002065059A1 - Method for coding optical driving instructions - Google Patents

Abstract

The invention relates to a method for coding optical driving instructions consisting of standardized geometric symbols in a navigation system for land vehicles. The driving instructions are displayed as a sequence of graphic instructions consisting of at least two basic forms of said symbols. The direction of the symbols relative to one another and the basic forms for the main route and the secondary route are different. The starting point of a subsequent basic form of the main route is set at the destination of a preceding basic form of the main route.

Description

Process for coding optical driving instructions

State of the art

The invention is based on the genus as shown in independent claim 1.

Optical driving instructions can be shown on a display of a car radio or a combined display for on-board information.

In order to provide the driver with comprehensive information about the route, relevant road situations must be presented in as much detail as possible so that the desired route can be clearly identified.

It is known to present complex driving instructions on a display matrix in which various symbols are located at predetermined positions on the display and can be switched on individually or in combination.

It is also known to combine individual driving instructions into a complex driving instruction in such a way that a number of individual driving instructions (e.g. roundabout, exit, side street, etc.) are specified and combined in any manner to form an overall picture can be.

A disadvantage of this known method, however, is that it is not possible to generate arbitrary driving information geometries that largely correspond to the real course of the road and route.

Advantages of the invention In the method according to the invention, driving instructions are generated as a result of drawing instructions from at least two basic forms of standardized geometric symbols. In addition, their directions to each other are shown and the basic forms themselves are shown differently for the main route and secondary route. The starting point of a following basic shape of the main route is advantageously set in each case on or at a point of a previous basic shape of the main route.

In this way, the driving instructions can be simulated with high accuracy and recognizability of the actual traffic situation and the main route. The abstraction to at least two basic geometrical forms enables the reduction of the memory requirement or the data rate when the information is transmitted. In addition, the information can also be converted from simple displays into corresponding representable symbols and scaled to the individual size of the display. The information can also be displayed on high-resolution displays with high quality.

A straight line and a circular segment are preferably represented as at least two basic shapes.

With these basic forms, the most common traffic situations can be represented with sufficient accuracy, namely straight lines, curves, junctions, intersections and roundabouts with exits.

Furthermore, at least eight different directions can be displayed.

As a result, road courses and branches can already be displayed with such great accuracy that the driver can make a clear decision.

A polygon can also be displayed as an additional basic shape. This makes it possible to represent situations that can not be adequately represented by straight lines or arcs, such as. B. places. A U-loop can also be represented as an additional basic form.

In addition to the very rare driving situation in which such a symbol is actually used, it can also be used to indicate that the driver should turn his vehicle if he has not followed an instruction and there is no other alternative turning option.

The driving instructions can each be compiled according to an assigned information about the number of drawing instructions to be displayed.

This allows the number of symbols to be displayed to be adapted to the traffic situation and to ensure a high degree of clarity.

Optionally, the sense of direction of the basic forms of circle segment and U-loop can be displayed depending on the local left-hand or right-hand traffic.

This enables automatic adaptation to the driving instructions in different countries without the need for manual measures to be taken on the navigation system.

The drawing instructions for each driving instruction can be displayed in a saved and / or transferred data record, which records information about the number of related drawing instructions as well as information about each drawing instruction about the main or secondary route, basic shape and direction.

Thanks to a standardized structure of the drawing instructions, the individual components of the drawing instructions can be processed one after the other and displayed in accordance with the regulations. By placing the starting point of a following basic form of the main route on or at the end point of a previous basic form of the main route, the main route has a clear, coherent course with corresponding orientation information for secondary routes. Advantageous developments of the invention are specified in the dependent claims.

drawings

Embodiments of the invention are shown in the drawing and explained in more detail in the following description. The attached drawing shows:

1 is a schematic representation of the structure of a drawing instruction for a basic form,

2 shows the structure of a drawing instruction for a right-turn instruction,

3 shows the structure of a drawing instruction for a roundabout for right-hand traffic,

4 shows a similar representation according to FIG. 2, but for left-hand traffic,

5 shows an illustration for an exit with multiple turning instructions.

Description of the embodiment

1 shows the basic structure of a drawing instruction for a single basic form. This includes information for the display as a main or secondary route and can be encoded by 1 bit, e.g. B. 0 for main route and 1 for secondary route. Furthermore, information about the geometric element to be drawn is specified and stored by two further bits. This contains at least the information about a straight line in the form of a 00 and a circle segment in the form of an 01. Furthermore, a polygon can be represented by a 10 and a U-loop by an 11. Furthermore, the basic form also contains an indication of the direction, here a total of 16 directions are shown, which are represented in steps of 22.5 ° by the bits 0000 for 0 °, 0001 for 22.5 °, 0010 for 45 ° etc. become. Alternatively, the "turning" symbol can also be represented by a straight line of a main route with a direction of 180 °.

For a complex driving instruction, the details of the individual basic forms are put together, whereby the number of basic forms and a reference to right-hand or left-hand traffic can also be stored in a common header for the driving instruction. When displaying on a display, one can also proceed in such a way that a basic shape is always shown in a straight line as the initial basic shape, but this does not have to be transmitted or saved separately. The individual drawing instructions then follow at the end point of this straight line.

Fig. 2 shows a right turn instruction. Two cross streets are shown in front of the main intersection. In addition to the drawing instructions, you can also see the binary code sequence with which the data is stored in memory or transmitted during transmission. The first instruction is preferably omitted, since, as already explained, it is always assumed to be a straight line as the main route in the direction of travel.

The first drawing instruction, which is coded, is therefore a vertical, bold, straight line. The starting point for the next drawing instruction is then the end of this first straight line. The second drawing instruction is a straight line in the form of a secondary route, which is drawn as a thin line from the new starting point in the direction of 90 °. The third drawing instruction is again a side line, which is drawn in the direction of 270 ° from the old starting point as a thin line. The following main line is shown as a bold line from the still fixed starting point in the direction of 0 °. This is followed by the last drawing instruction, which is shown here as a thick arrow in the direction of 90 °.

Fig. 3 shows a roundabout for right-hand traffic. Starting from the starting point, a bold straight line in the direction of 0 ° is shown again without drawing instructions. The first drawing instruction is a roundabout exit in the direction of 225 °. This is followed by two further exits from the roundabout, the last one in the direction 45 ° of the main route is shown. Since the first two exits are part of the branch lines, all drawing instructions start at the same starting point. Only after drawing the last exit, which is the main route, will the new starting point be placed at the end.

Fig. 4 shows an analog representation for a roundabout for left-hand traffic. The information for left-hand traffic is given in the header and is therefore only required once, but not for every drawing instruction. Starting from the starting point, a bold straight line in the direction of 0 ° is shown again without drawing instructions. The first drawing instruction is a segment of a circle in the direction of 135 ° etc. similar to FIG. 3 with a different direction.

Finally, Fig. 5 shows an exit at which it has to be driven twice. The first straight line is again a vertical straight line in bold type without any drawing instructions. The starting point for the next drawing instruction is the end of this straight line. The second drawing instruction is a straight line for a secondary route, which is shown as a thin line from the new starting point in the direction of 0 °. The starting point remains unchanged. The third drawing instruction is a main line, which is drawn in bold in the direction of 315 °, the starting point shifting to the end point of the main line. The next drawing instruction is again a main straight line that runs in the direction of 0 °. There follows a side street in the direction of 0 ° and finally the arrow in the direction of 315 °.

Claims

claims 1. A method for coding optical driving instructions from standardized geometric symbols in a navigation system for land vehicles, characterized in that the driving instructions as a result of drawing instructions from at least two basic forms of the symbols and their direction to one another and the basic forms in turn are represented differently for main route and secondary route, the starting point of a following basic form of the main route is respectively set on or at a point of a previous basic form of the main route. 2. The method according to claim 1, characterized in that a straight line and a circular segment are represented as at least two basic shapes. 3. The method according to claim 1, characterized in that at least eight different directions are shown. 4. The method according to claim 2 or 3, characterized in that a polygon is represented as an additional basic shape. 5. The method according to any one of claims 2 to 4, characterized in that a U-loop is shown as an additional basic shape. 6. The method according to any one of claims 1 to 5, characterized in that the driving instructions are each composed according to an assigned indication of the number of drawing instructions to be displayed. 7. The method according to any one of claims 1 to 6, characterized in that the sense of direction of the basic shapes "circle segment" and "U-loop" is shown depending on the local left-hand or right-hand traffic. 8. The method according to any one of claims 1 to 7, characterized in that the drawing instructions of each driving instruction are presented from a stored and / or transmitted data record, which contains information about the number of associated drawing instructions and for each drawing instruction information about main or secondary route, Basic form and direction includes.