Abstract: A monitoring network is formed by a terrestrial network and a satellite network. The terrestrial network has a plurality of sensor nodes which send a data packets. The data packets are forwarded through sink nodes toward a satellite and a monitoring station in the satellite network. The monitoring station performs a dynamic selection process for dynamically associating each sensor node to at least one selected sink node among the plurality of sink nodes, thereby the data packets sent by the sensor nodes are transmitted to the satellite through only the selected sink node.

Abstract: What is described is a circuit arrangement and a method for synchronizing the communication signals between a repeater station (S) of a single-frequency simulcast radio communication network (N) and user terminals (T) with respect to a universal reference signal sent by a central station (M) of the network (N) communicating with the repeater station (S). A frequency offset is determined between a universal frequency reference signal received from the central station (M) and a local frequency reference signal of the repeater station (S), and in the repeater station (S) there are provided a first feedback control loop for supplying a signal for controlling a local oscillator of the repeater station (S) on the basis of the said determined frequency offset, and a second direct control loop for supplying a signal for compensating the residual synchronization difference of the local oscillator (16) to which the transmitter device of the station (S) is tuned.

Abstract: A method for the automated management of services envisaged by a predetermined communications plan of a telecommunication system on-board a ship includes radiocommunication resources. The method defines static constraints or criteria, indicates the nominal characteristics of the resources forming part of the on-board system, and dynamic constraints or criteria, and indicates the state of use and the current operating conditions of the resources. The method also includes searching for a resource adapted to perform a service required, on the basis of the static constraints; checking for availability of the resource on the basis of the dynamic constraints; assigning the resource to the service required, if it is available, or otherwise assigning a different resource available, selected on the basis of the static and dynamic constraints or criteria.

Abstract: A structural antenna system for operation in the HF frequency range, particularly for naval communications, is described, comprising at least one linear radiating arrangement (14) adapted to be operatively associated with a ground conductor (GND) and at least one electrical impedance device (Z1-Z4), in which the aforesaid linear radiating arrangement (14) is coupled to a pre-existing naval structure which has a predominantly vertical extension and is electrically conducting, such as a funnel (F). A structural antenna system with multiple feed comprises a plurality of linear radiating arrangements (114) positioned in meridian planes of the naval structure of the funnel type (F), spaced at equal angular intervals.

Abstract: A linear antenna for operation in the HF frequency range, particularly for naval communications is disclosed, comprising a radiating arrangement (H1, H2, H3, W1, W2), adapted to be operatively associated with a ground conductor (20) and at least one electrical impedance device (Z1-Z4), characterized in that it includes: a plurality of wire radiating elements with a predominantly vertical extension, forming a first and a second conducting branch (H1, H2) adapted to be operatively coupled to a feed circuit, and a return conducting branch (H3) adapted to be operatively coupled to a ground conductor (20); and a plurality of wire radiating elements with a predominantly transverse extension, forming connecting conducting branches (W1, W2) for connecting the conducting branches (H1, H2) adapted to be coupled to the feed circuit (12), to the conducting branch (H3) adapted to be coupled to the ground conductor (20), the radiating elements being positioned in such a way as to form, in a plane in which the antenna lies,

Abstract: A power converter is described adapted to be connected to an electrical power source, in particular a voltage source (Vcc), and intended to receive at the input a control signal (A(t)) for the conversion, including a first regulator circuit (L1, C1, M1, D1) of the pulse width modulation step-down type and an energy recovery-circuit for managing a bidirectional flow of energy from the source to the load and from the load to the source; such an energy recovery circuit may advantageously be implemented using a second regulator circuit (L2, M2, D2) of the pulse width modulation step-up type.

Abstract: A method for the automated management of services envisaged by a predetermined communications plan of a telecommunication system on-board a ship includes radiocommunication resources. The method defines static constraints or criteria, indicates the nominal characteristics of the resources forming part of the on-board system, and dynamic constraints or criteria, and indicates the state of use and the current operating conditions of the resources. The method also includes searching for a resource adapted to perform a service required, on the basis of the static constraints; checking for availability of the resource on the basis of the dynamic constraints; assigning the resource to the service required, if it is available, or otherwise assigning a different resource available, selected on the basis of the static and dynamic constraints or criteria.

Abstract: What is described is a circuit arrangement and a method for synchronizing the communication signals between a repeater station (S) of a single-frequency simulcast radio communication network (N) and user terminals (T) with respect to a universal reference signal sent by a central station (M) of the network (N) communicating with the repeater station (S). A frequency offset is determined between a universal frequency reference signal received from the central station (M) and a local frequency reference signal of the repeater station (S), and in the repeater station (S) there are provided a first feedback control loop for supplying a signal for controlling a local oscillator of the repeater station (S) on the basis of the said determined frequency offset, and a second direct control loop for supplying a signal for compensating the residual synchronization difference of the local oscillator (16) to which the transmitter device of the station (S) is tuned.

Abstract: A structural antenna system for operation in the HF frequency range, particularly for naval communications, is described, comprising at least one linear radiating arrangement (14) adapted to be operatively associated with a ground conductor (GND) and at least one electrical impedance device (Z1-Z4), in which the aforesaid linear radiating arrangement (14) is coupled to a pre-existing naval structure which has a predominantly vertical extension and is electrically conducting, such as a funnel (F). A structural antenna system with multiple feed comprises a plurality of linear radiating arrangements (114) positioned in meridian planes of the naval structure of the funnel type (F), spaced at equal angular intervals.

Abstract: A linear antenna for operation in the HF frequency range, particularly for naval communications is disclosed, comprising a radiating arrangement (H1, H2, H3, W1, W2), adapted to be operatively associated with a ground conductor (20) and at least one electrical impedance device (Z1-Z4), characterized in that it includes: a plurality of wire radiating elements with a predominantly vertical extension, forming a first and a second conducting branch (H1, H2) adapted to be operatively coupled to a feed circuit, and a return conducting branch (H3) adapted to be operatively coupled to a ground conductor (20); and a plurality of wire radiating elements with a predominantly transverse extension, forming connecting conducting branches (W1, W2) for connecting the conducting branches (H1, H2) adapted to be coupled to the feed circuit (12), to the conducting branch (113) adapted to be coupled to the ground conductor (20), the radiating elements being positioned in such a way as to form, in a plane in which the antenna lies