The invention relates to a regional navigation satellite supplementary system.
A navigation system must not only allow positioning of the user with the required precision, continuity, and availability, but also provide the other information necessary for navigation. This other information is typically provided on paper via a map, on a storage media, via traffic radio messages, which are also distributed in digital form.
The street grid maps used in the navigation systems are usually fixed and typically require user interaction to obtain regular updates. Using known techniques, information about current or future traffic obstructions is available only on the local or regional level (if at all), and interregional information (which is also significant for planning longer trips) is typically not easily available. Accordingly, conventional systems do not necessarily provide selective detour recommendation that account for new traffic obstructions that could arise due to bypass recommendations.
Exemplary embodiments of the present invention provide devices and methods which allow traffic obstructions to be bypassed. This allows the street infrastructure to be used significantly more effectively because traffic obstructions may be bypassed. Moreover, the present invention significantly reduces the effort that a user must expend to have current planning documents for his trips.
In accordance with exemplary embodiments of the present invention, the navigation satellites of the navigation satellite supplementary system which are located over an area in which a service is to be provided are located close to the zenith and transmit a relatively strong navigation signal into the service area. For example, these satellites may fly on suitable geosynchronous orbits, on geosynchronous orbits in or near the equatorial level, or also on so-called Molniya orbits.
These satellites are then implemented as controllable using a (vertically) oriented antenna, to achieve the highest possible signal strength in the service area with the least possible power consumption, the signal strength being dimensioned in such a way that the signals of other satellite navigation systems may still be received. This is achieved, inter alia, by a suitable selection of the coding of the signals.
The signals transmit navigation-relevant information at a data rate which is significantly above the data rate of the commercial service of Galileo. This information contains, inter alia, current and expected traffic obstructions in the service area, recommendations for how specific user groups having various travel directions and travel destinations (which may be regionally combined) are to drive around these traffic obstructions, changes of the street grid in the service area, and also comprise expected traffic obstructions due to environmental influences, chronologically recent changes being repeated relatively frequently and chronologically earlier changes being repeated relatively rarely (which may be no repetition at all). The invention also discloses arbitrary combinations of the above-mentioned navigation-relevant information.
Exemplary embodiments of the present invention include a method for transmitting a navigation signal that involves generating navigation signals, wherein the signal strength of the navigation signals is dimensioned in such a way that it is still possible to receive signals of other satellite navigation systems, and wherein the signals transmit navigation-relevant information at a data rate which is significantly above the data rate of the Galileo satellite system; and transmitting the generated navigation signals.
The features specified in connection with the embodiments of the device of the invention are also disclosed for the method.
Other objects, advantages and novel features of the present invention will become apparent from the following detailed description of one or more preferred embodiments when considered in conjunction with the accompanying drawings.