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A method is developed for dynamically configuring a network with numerous subnets, each subnet comprising at least one router node and said network comprising at least one subnet server. For enhancing the efficiency, the determination of a subnet master for configuring a subnet is carried out with two parallel processes:


A method is developed for dynamically configuring a network with numerous subnets, each subnet comprising at least one router node and said network comprising at least one subnet server. For enhancing the efficiency, the determination of a subnet master for configuring a subnet is carried out with two parallel processes: - election of a subnet master among the router nodes of said subnet - allocation to each router node of said subnet of a subnet identifier. Configuration of the subnet, achieved by the subnet master with its allocated subnet identifier, is refreshed regularly, in particular when detecting a change in the configuration of the network.


A method for localizing a marine animal in an underwater environment implemented by a passive acoustic monitoring (PAM) system. The passive acoustic monitoring system includes network of acoustic sensors adapted to carry out measurements of acoustic signals. The method includes: obtaining, from the network of acoustic sensors, measured data of an acoustic signal emitted by a marine animal; defining a space of dimensional representation of the underwater environment discretized in a plurality of predefined cells, for each cell of a predefined set, obtaining an error defined as a value of a cost function for the cell, the cost function giving a deviation between: at least some of the measured data; and corresponding theoretical data obtained by assuming the marine animal is located in the cell, the errors obtained for the predefined set of cells enabling to obtain at least one piece of information about localization of the marine animal.


Patent
Sercel Inc. | Date: 2017-04-26

There is provided a method for electing a master routing node of a given subnet of a network, comprising: determining (71) a first-type address associated with an interface of each node on the given subnet, and being the address given by a routing table of the next hop (router node or target node) on the path leading from the node to a target node; determining (72) a second-type address associated with the interface of each node on the given subnet, and being either the determined first-type address (if the latter is on the given subnet) or the address of the interface of the node on the given subnet (if the determined first-type address is on another subnet); sending (73) by each router node of the given subnet a message containing its determined second-type address; collecting (74) at the interface of each node on the given subnet the sent messages; selecting (75) for the interface of each node on the given subnet a third-type address among its determined second-type address and the second-type addresses contained in the collected messages, according to a selection rule known by all nodes of the subnet; electing (76) as master routing node of the given subnet the node having the selected third-type address.


There is provided a method for electing a master routing node of a given subnet of a network, comprising: determining (71) a first-type address associated with an interface of each node on the given subnet, and being the address given by a routing table of the next hop (router node or target node) on the path leading from the node to a target node; determining (72) a second-type address associated with the interface of each node on the given subnet, and being either the determined first-type address (if the latter is on the given subnet) or the address of the interface of the node on the given subnet (if the determined first-type address is on another subnet); sending (73) by each router node of the given subnet a message containing its determined second-type address; collecting (74) at the interface of each node on the given subnet the sent messages; selecting (75) for the interface of each node on the given subnet a third-type address among its determined second-type address and the second-type addresses contained in the collected messages, according to a selection rule known by all nodes of the subnet; electing (76) as master routing node of the given subnet the node having the selected third-type address.


A system and method for adjusting a clock signal of a seismic data acquisition system. The system includes a data acquisition device having an oscillator that generates a clock signal; a clock adjustment module that receives a time reference signal and the clock signal and outputs an adjusted clock signal; and an analog-to-digital convertor configured to transform analog data into digital data having a sampling rate (F_(DATA)). A sampling frequency (f_(ADC)) of the analog-to-digital convertor is selected to be at least twice the sampling rate (F_(DATA)).


Patent
Sercel Inc. | Date: 2016-04-20

Method and down-hole tool for use inside a well, the down-hole tool including a housing; an anchoring arm rotatably attached to the housing and configured to move between an open position and a closed position; a spring block configured to have a central part that moves along a longitudinal axis of the housing which results in the movement of the anchoring arm between the open or closed positions; and an actuating mechanism connected to the central part and configured to move the central part along the longitudinal axis. The spring block is detachably attached to the housing.


Patent
Sercel Inc. | Date: 2016-09-26

A coupling device is provided for a sensor unit having at least one sensor located within a housing. The coupling device includes at least one supporting portion, wherein the supporting portion is configured for maintaining the sensor unit in a stable position, with the coupling device either resting on or being buried into the ground, and at least one rod, arranged in a plane which is essentially perpendicular to a peripheral surface of the supporting portion and linked to the supporting portion. The coupling device further includes a fastener for connecting the sensor unit to the coupling device. The supporting portion maintains the sensor unit in a stable position when resting on the ground, while the rod provides an additional stiffness to the housing.


It is proposed a method for determining a sail path of vessels on a map representative of a marine geographic area, to perform a turn between a start point and an end point, each vessel having a turn radius, the start point, respectively the end point, being associated with a start, respectively an end, circle, the sail path being curvilinear and composed of arcs and straight segments. The method comprises steps of: detecting (21) obstacles likely to interfere with at least one vessel; encompassing (23) obstacles into a curvilinear geometric form; determining (25) a sail path of the vessel by minimizing, under constraints, a cost function comprising: a first term representative of the length of arcs making up the sail path and a second term representative of the length of straight segments making up the sail path, taking into account the start and end circles and the curvilinear geometric forms, and a third term of penalization of distance separating the sail path to be determined, at any point of said sail path, and at least one disturbing object.


Patent
Sercel Inc. | Date: 2016-05-11

A seismic detection line includes one or more identified element(s) (112) arranged in a string, and a telemetry link (315) connecting the element(s) along the string to convey seismic data from at least one of the element(s) to a data recorder and identification data to a topology controller (210). Each of the element(s) includes a respective first identification unit (256) connected to the telemetry link to provide a respective first identifier to the topology controller. A seismic detection system also includes a processor that queries the identified element(s) for their respective identifiers, determines an arrangement of the seismic detection line using the received identifiers, and presents an indication of the determined arrangement. A method of operating a seismic detection line includes transmitting a query along the telemetry link, detecting whether the respective identifier of one of the element(s) was received or not, repeating until termination, and determining and indicating the arrangement.

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