초록 ▼

The invention relates to a system to be used as an aid in navigation comprising a mobile terminal (1, 2) connected to a centralized server (5), and more specifically to the improvements required to convert a portable radiotelephone (1) into a complete and precise navigational aid system. The inventi

The invention relates to a system to be used as an aid in navigation comprising a mobile terminal (1, 2) connected to a centralized server (5), and more specifically to the improvements required to convert a portable radiotelephone (1) into a complete and precise navigational aid system. The invention is characterized by the fact that the itinerary requests of the mobile terminal (1, 2) are transmitted to a centralized server (5) by a radio relay link, and by the fact that the server (5), which contains the necessary cartographic and program data, calculates the itinerary requested and transmits to the mobile terminal (1, 2) the data concerning the straight line and arc segments that constitute the itinerary, thereby permitting real-time guidance. The invention is further characterized by the fact that the server (5) evaluates the possibility of the craft deviating from its course, as well as by the fact that the server (5) also calculates and transmits the data concerning the segments of possible deviation itineraries in an area of proximity to the main itinerary. The invention can be applied in particular to automotive vehicles.

대표청구항 ▼

1. Interactive process for use as a real-time navigational aid by which a mobile terminal (1,2), with means of positioning (18,19) transmits, through a wireless network, itinerary requests to a fixed server (5) which transmits, in answer to the mobile terminal (1,2) and using the same network, itine

1. Interactive process for use as a real-time navigational aid by which a mobile terminal (1,2), with means of positioning (18,19) transmits, through a wireless network, itinerary requests to a fixed server (5) which transmits, in answer to the mobile terminal (1,2) and using the same network, itinerary data; characterized by the fact that the itinerary data comprise the latitudes and longitudes of at least one extremity of the straight line or arc segments forming the itinerary; by the fact that the mobile terminal (1,2) develops real-time guidance messages according to the position of the mobile terminal (1,2) compared to the itineraries received by the server (5); by the fact that, when answering the mobile terminal (1,2), the server (5) also transmits data concerning the roads intersecting with the itinerary; by the fact that, when answering the mobile terminal (1,2) the server (5) also transmits data concerning a proximity area around the itinerary; by the fact that if the mobile terminal (1,2) deviates from the itinerary by taking one of the intersections, the mobile terminal (1,2) obtains, without any additional connection to the server (5), a new itinerary according to its position and the data of the proximity area and transmits guidance messages to this effect; and by the fact that if the mobile terminal (1,2) leaves the proximity area, the mobile terminal (1,2) automatically transmits a new itinerary request to the server (5), a request which also includes data concerning the position of the mobile terminal (1,2).