- A method for determining a network coverage in at least one control point (Pc) comprised in an environment, the environment comprising at least one transmitting antenna which transmits an electromagnetic signal, the method being implemented by an electronic determination device and comprising the following steps - obtaining a model of the environment, the model comprising obstacles suitable for reflecting the electromagnetic signal, the transmitting antenna and the control point (Pc), each obstacle being formed by a plurality of parts of an obstacle, - determination of a trajectory specific to each of a plurality of initial rays, each initial ray being transmitted from the transmitting antenna, in the model of the environment, along a respective direction of transmission (θ, φ), at least one of the plurality of initial rays being reflected on at least one part of obstacle, - for the or each initial ray the trajectory of which obeys a constraint associated with the or one of the control points (Pc), calculation for the or one of said control points (Pc), of a trajectory of a corrected ray passing through said control point (Pc) and through the transmitting antenna, the trajectory of each corrected ray comprising a corrected direction of transmission (θ c, φ c) - storage of the or at least part of the corrected rays and the respective trajectory thereof in a cumulative database, - for each control point (Pc), if the cumulative database comprises a plurality of corrected rays, the corrected directions of transmission (θ c, φ c) of which are substantially identical, selection of only one of said corrected rays, and - determination of the network coverage at the or each control point (Pc) by applying a loss model in electromagnetic signals to the selected rays of the cumulative database, the loss model depending on the number of selected rays reaching the control point (Pc), a length of the path of each selected ray, and a number of reflections in the path of each selected ray. - obtaining a model of the environment, the model comprising obstacles suitable for reflecting the electromagnetic signal, the transmitting antenna and the control point (Pc), each obstacle being formed by a plurality of parts of an obstacle, - determination of a trajectory specific to each of a plurality of initial rays, each initial ray being transmitted from the transmitting antenna, in the model of the environment, along a respective direction of transmission (θ, φ), at least one of the plurality of initial rays being reflected on at least one part of obstacle, - for the or each initial ray the trajectory of which obeys a constraint associated with the or one of the control points (Pc), calculation for the or one of said control points (Pc), of a trajectory of a corrected ray passing through said control point (Pc) and through the transmitting antenna, the trajectory of each corrected ray comprising a corrected direction of transmission (θ c, φ c) - storage of the or at least part of the corrected rays and the respective trajectory thereof in a cumulative database, - for each control point (Pc), if the cumulative database comprises a plurality of corrected rays, the corrected directions of transmission (θ c, φ c) of which are substantially identical, selection of only one of said corrected rays, and - determination of the network coverage at the or each control point (Pc) by applying a loss model in electromagnetic signals to the selected rays of the cumulative database, - storage of the or at least part of the corrected rays and the respective trajectory thereof in a cumulative database, - for each control point (Pc), if the cumulative database comprises a plurality of corrected rays, the corrected directions of transmission (θ c, φ c) of which are substantially identical, selection of only one of said corrected rays, and - determination of the network coverage at the or each control point (Pc) by applying a loss model in electromagnetic signals to the selected rays of the cumulative database, the loss model depending on the number of selected rays reaching the control point (Pc), a length of the path of each selected ray, and a number of reflections in the path of each selected ray.