| 摘要 |
<p>Initial phase system compiles data base (32,33) in form of direct access data matrix with autonomous and local specification of respective positions of geographical relief's (41,42) for number of predetermined mesh positions in mesh corresponding to cover map. System memorizes geographical orientation data for relief's in matrix data base. In operation phase, system compares current mesh point position to identify mesh impact.. System then calculates propagation conditions after impact from local/autonomous specification data for relief in impact mesh, and calculates reflected direction for forward section (52) from orientation data. Method for provisional estimation of radio cover for a cell (1) of a cellular radiotelephony network, with station (11) for traffic management in the cell. It uses a data base (32,33) for a relief map (31) specifying natural positions and relief's (41,42) for the cell. Method in which the system calculates an operation phase: (a) fictitiously launch in the cell (1) a sample ray representing the radio-electric propagation conditions along an initial trajectory section (51) from an origin position along a set direction with set propagation conditions; reading from the data base (32,33), the system compares the trajectory section to the relief map data so as to identify the position and nature of all current impact points for the trajectory section with obstacles (41,42); after the considered object in the relief data base has been considered the system determines new propagation conditions on a forward section of the trajectory beyond the point of impact; the system reiterates if necessary the two preceding stages a set number of times for other forward trajectory impact sections (52-55), and; then repeatedly calculates all the above stages a number of times for a number of initial directions so as to sample all the cell and thus determine an attenuation map for selected points.</p> |
