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: A method for managing node communications in a mobile ad-hoc network is provided where at least a node in the said network performs the following steps: identifying if it is a Potentially Disruptive Node (PDN) or a non-PDN node, a PDN node being a node that has a number of connected 1-hop neighbour nodes greater than a predetermined value K; when the node is identified as a PDN node, selecting a subset of its 1-hop neighbour nodes, the selected nodes being the only 1-hop neighbour nodes that are allowed to communicate directly with the PDN node, the selected nodes being called Bridge Nodes (BN), non-BN nodes being called Regular Nodes (RN), the said RN nodes being able to communicate with PDN nodes via the selected BN nodes.

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: Traditionally, in fault diagnosis systems, the user is instructed to investigate symptoms exhaustively until a single fault is identified. A more advanced known system recognises that it may be cost effective to address a fault that has been determined as being likely but not certain to exist; in preference to further examination of the symptoms. However this technique has been found not to work well when a symptom is known to be only sometimes associated with a fault. The invention addresses this problem by 1) deriving a first value, for each fault, of probable benefit of acting on that fault and for identifying the fault for which that value is greatest, 2) deriving a second value, for each symptom, of probable benefit of an investigation into that symptom and for identifying the symptom for which that second value is greatest, and 3) comparing the greatest first value with the greatest second value thereby determining when to switch from investigating symptoms to acting upon a fault.

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

Abstract: A fault diagnosis system for diagnosing faults in complex equipment. The system includes means for storing a set of diagnostic signatures which relates a set of known faults which may occur in the equipment to respective fault symptoms which are deemed indicative of said known faults; and means for processing the diagnostic signatures and a set of fault symptoms identified for a current state of the equipment to calculate diagnostic data for identifying a fault causing the current state of the equipment. The diagnostic data includes a plurality of values which are indicative of different relative non-zero likelihoods of each of a plurality of different known faults causing the current state of the equipment.

Abstract: Described herein is a system and method for detecting the position of a remote emitter (1) where the emitter (1) is emitting a radio frequency signal (2) in a radio field (3). The system and method uses at least one receiver (4) which is moveable within the environment of the radio field (3), each receiver (4) measuring and recording the amplitude of the radio frequency signal (2) and recording its precise location using a GNSS or GPS receiver. The data recorded is processed and compared to data predicted by the receiver(s) (4) to estimate a location of remote emitter (1).

Abstract: A method and apparatus for placing a long distance call using a mobile telephone with a data messaging device communicating via a separate data network (rather than the call signaling network) to a Remote Telephone Call Origination (RTCO) platform. The mobile telephone analyzes each number dialed to determine whether to utilize the RTCO platform or to dial normally. If RTCO is utilized, the mobile telephone transmits a data message with instructions for setting up the call. The RTCO platform then makes a call to the mobile phone and bridges this to a second call made to the dialed party.