Abstract:
La présente invention concerne un procédé et un dispositif de localisation en milieu aquatique multi longueurs d'onde. Pour localiser un émetteur (2) d'un rayonnement en milieu aquatique par un récepteur (1), notamment mobile, on génère sur l'émetteur au moins un ensemble («MOT 4») d'impulsions d'un rayonnement optique de puissances déterminées puis on détermine sur le récepteur (1) sa position relative audit émetteur (2) sur la base des impulsions reçues De plus on exécute les étapes de : générer sur l'émetteur (2) au moins un autre ensemble («MOT 5») d'impulsions de puissances déterminées sur au moins une longueur d'onde présentant une absorption dans le milieu aquatique, supérieure à celle de l'ensemble «MOT 4»; puis déterminer sur le récepteur (1) sa position relative audit émetteur (2) en identifiant les puissances reçues dans l'ensemble («MOT 4») d'impulsions de rayonnement optique de référence et dans ledit au moins un autre ensemble («MOT 5») de puissances déterminées dans une autre longueur d'onde plus atténuée.
Abstract:
The present invention relates to transmitting data using vector sensors and via the vector components of the acoustic field. The data can be received via vector sensors and/or scalar sensors and/or arrays of such sensors.
Abstract:
A data communications system is provided comprising a submersible home vessel, a submersible satellite vessel, and a flexible dielectric waveguide cable. The flexible dielectric waveguide cable comprises an exposed dielectric face configured to transmit electromagnetic millimeter wave radiation. The submersible home vessel comprises a transparent pressure boundary that is configured to be functionally transparent to electromagnetic millimeter wave radiation and to permit unguided propagation of the electromagnetic millimeter wave radiation. The submersible home vessel further comprises a coupling portion that is configured to secure the dielectric face in a position that enables the transmission of unguided millimeter wave radiation across the transparent pressure boundary to a MMW detector within the submersible home vessel. Additional embodiments are disclosed and claimed.
Abstract:
A system for interconnecting a mother ship with a submersible vehicle, using a cable towed by the mother ship, the cable having a first cable end connected to the mother ship, and a second cable end to be connected to the submersible vehicle, the second cable end being provided with a first connector, the system comprising: a capturing mast arranged at the submersible vehicle for capturing the cable towed by the mother ship; a connector holder being arranged at the submersible vehicle for holding the first connector when it is to be connected to a second connector, the second connector being connected to the submersible vehicle; first guiding means being arranged at the submersible vehicle for guiding the first connector towards the connector holder of the submersible vehicle; second guiding means for turning the connector to a well defined position into the connector holder.
Abstract:
The invention concerns a device (10) for propagating electromagnetic waves through impure water such as seawater or brackish water. The device (10) comprises a body of polar material, for example pure water (14), contained in an enclosure (16), and an antenna (12) arranged to emit an electromagnetic signal into the polar material. Excitation of dipoles in the polar material by the electromagnetic signal causes them to re-radiate the signal, which is thereby emitted into and relatively efficiently propagated through the water in which the device (10) is submerged. The device (10) offers the possibility of improved underwater communication.
Abstract:
Dispositif d'interaction hommes / machines / mammifères marins comprenant un écran de visualisation et/ou d'une balise munie d'un ou plusieurs récepteur(s) / émetteur(s) de signaux aériens et/ou sous marins et pilotée par une carte électronique qui analyse les informations codées dans les fréquences, les amplitudes et les rythmicités des signaux reçus en fractionnant un ou deux ou trois de ces paramètres puis détectant sur chaque portion un ou des événement(s) organisés et/ou supérieur(s) à un seuil d'excitation et/ou contenant des éléments identifiables, rythmés ou non, susceptibles de leur conférer une signification, ce traitement de signal donne lieu ou non à une combinaison d'émissions de signaux et/ou d'actions sous marines et/ou aériennes de la balise, et/ou une action type communication à d'autres systèmes, et/ou une modification d'activité humaine. Cette invention permet d'harmoniser les interactions homme / mammifère marin et d'établir les bases d'un protocole de communication inter-spécifique.
Abstract:
There is provided a communication method using a human body as a medium. A modulation apparatus using a frequency selective baseband according to an aspect of the invention may include: a serial-to-parallel conversion unit converting serial data supplied from an upper layer into parallel data consisting of M+1 number of data input bits; and a frequency selective spreader selecting one subgroup among a plurality of subgroups obtained by dividing 2 N number (where N is a positive integer) of spreading codes used for frequency spreading by 2 M (where M is a positive integer, and M M number of spreading codes of the one subgroup by using the M number of data input bits, and spreading codes obtained by performing bit circular shifts on the 2 M number of spreading codes. Accordingly, the number of transmission data is increased to improve a transmission data rate, strong interference induced from users and other electronic devices is reduced, and stable human body communication having low power consumption is performed.
Abstract:
A wireless magnetic through-hull communications apparatus and method which permit higher data-rate communications through materials than presently available using acoustic techniques is described. A signal source on one side of a barrier is directed into a coil driver which generates an amplified, modulated signal responsive thereto. The resulting signal is used to drive a transmitter coil which generates a time-varying magnetic field that penetrates the barrier as well as any gaps comprising water, air or other material between the barrier and the transmitter coil. On the other side of the barrier, and perhaps through additional gaps comprising water, air or other material, a receiver coil detects the time-varying magnetic field. This signal may be amplified and then digitized by a signal processor. The signal processor may then communicate with a data processing and/or display unit, another sensor or some other device. Electric power may also be transmitted through the barrier for providing power to instrumentation without the need for batteries.
Abstract:
A Time Division Duplex (TDD) communication apparatus and an operation method thereof can provide operation clock signals in the transmission and reception of the TDD communication apparatus using a Clock Recovery & Data Retiming (CDR) circuit, thereby stabilizing an operation without any crystal oscillator and reducing the power consumption. In a transmission time interval, a transmitting frame is processed using a clock signal of a reference frequency generated from the CDR circuit. In a reception time interval, a receiving frame is processed using a clock signal recovered from the receiving frame by the CDR circuit.