Showing papers on "Sensor node published in 1994"

Configuration device for use in a networked communication system

Abstract: An apparatus useful in the configuration of communication network. The present invention provides for improved apparatus and techniques for configuration of network nodes. In particular, what is described is a device which may be coupled with each node of a network. When coupled to a node, the device and node cooperate in allowing communication of information identifying the node and the node type to the device. The node identification and type information may then be utilized to reliably complete configuration of a network.

Routing for reliability in decentralised sensing networks

Abstract: Considers the problem of management and configuration in a decentralised sensing network in which each sensor node implements both local and global estimation algorithms. The sensing networks considered here are characterised by three general constraints. The authors are concerned with the problem of management in such systems: they require that the network be able to overcome local failures by supporting topology reconfiguration and the reallocation of sensing and communication tasks. Previous work has proposed that this can be achieved only by relaxing the system constraints. The authors show that it is necessary to relax the system constraints only in a very limited sense. The approach taken allows the authors to maintain the decentralised system constraints on the sensing nodes. A fundamental aspect of management is the provision of a means of routing information which is not compromised by failures of communication links or processors and which, in turn, does not compromise the general constraints under which the decentralised system and estimation algorithms are required to operate. The authors provide a reliable routing system, using an algorithm for asynchronous distributed dynamic programming and describe its implementation on a practical decentralised sensing network for a process monitoring plant.

Transconductance-capacitor filter circuit with current sensor circuit

Abstract: A transconductance-capacitor filter system (8) is provided which includes a transconductance-capacitor filter 10 having a first node (NODE 1) and a second node (NODE 2). A current sensor circuit 12 is coupled to the first node (NODE 1) and the second node (NODE 2).

Method and interface device for monitoring and evaluating sensor signals

Abstract: of EP0660089A sensor interface (10) for determining whether a three-wire or a two-wire sensor (not shown) is coupled to the interface at 40. In the case of a three-wire sensor, the interface (10) determines that the sensor is powered by a power supply through a selected contact (40a) in electrical communication with the sensor. This is indicated at output (42). For both two- and three-wire sensors the interface (10) generates an output (44) corresponding to a status of the attached sensor.

Maximum demand power controller

Abstract: PURPOSE: To easily distribute wirings roundabout even when many power loads are controlled and to eliminate the concentration of a load regarding the control to one controller. CONSTITUTION: A sensor node 2 predicts the power consumption amount of the entire facility according to a pulse output from an integrating wattmeter 1, and outputs power warning information based on the prediction to a transmission line 5. Control nodes 3a to 3c control the power consumptions of power loads 4a to 4c corresponding to the control nodes according to the power warning information received via the line 5.

Array localization using least squares error minimization

Abstract: Accurate localization of array sensor nodes is often a problem in ocean surveillance areas where in-situ surveying is not possible. This is due to the inability to completely control an array during its deployment phase. Ocean currents, ship motion, and array line flexure often make post deployment calculation of final positions largely a guessing game. Different optimization techniques are researched as estimators for sensor node positions. In this study, the sensors consist of an array of total field magnetometers interleaved with acoustic and electromagnetic sensors. A surface ship with known course and speed traveling near the array generates a magnetic signature which is picked up by the array. A far-field dipole model is assumed and the parameters are estimated by minimizing the least-squares error discrepancy over the sampled time series. Variable-metric and stochastic methods are used to optimize the parameter estimation problem. >