摘要:
Static transmitter stations are used to determine the position of a mobile receiver unit. Each transmitter station transmits an ultrasonic signal including a transmitter-specific phase-shifting signature. The receiver unit receives a signal and identifies a transmitter station by its signature. It uses the received signal and the identity of the source transmitter station to determine the position of the mobile receiver unit. The signature may include two patterns phase-shift-key (PSK)-encoded on respective carrier signals of the same frequency but different phase, with the patterns being offset from each other by a transmitter-specific offset. The signal from the transmitter station may also include a PSK-encoded message.
摘要:
A position determination system is provided comprising one or more fixed base units and one or more mobile units, wherein the system is arranged to determine the horizontal position of a mobile unit based on the proximity of said mobile unit to at least one base unit and wherein the system is arranged to determine the height of said mobile unit based on the air pressure sensed at the mobile unit and the air pressure sensed at one or more of the base units. The use of pressure sensors to determine height reduces the complexity of the infrastructure required for 3D positioning. The invention finds particular benefit in patient care and monitoring environments and in object tracking and inventory systems. The invention also extends to mobile units for use in the system, intelligent buildings fitted with the system and to methods of determining the position of mobile units.
摘要:
A network has wireless access points, each configured for bi-directional communication, using a first radio protocol, with a communication device that has been associated with the access point by an association data exchange. Each access point is also configured to receive, at a first data rate using the first radio protocol, a multicast radio message and to forward the multicast message onto the network. A radio transmitter is configured to send data at a second data rate, using a second radio protocol different from the first radio protocol. A wireless communication unit transmits a multicast radio message at the first data rate using the first radio protocol. It also receives data from the radio transmitter at the second data rate using the second radio protocol and decodes the data.
摘要:
In a method for composing and presenting information in a user context, the information shall be presented for the user on a man-machine interface in the form of a visual or graphic display. The method comprises steps for determining a user context in which the information is required, selecting a set of content sources, and the content components are retrieved from the content sources. The information in selected content components are computed using an information measure that reflects the information as perceived by human cognition, and an optimum presentation of the selected content components are determined and presented for the user.
摘要:
In a method for administrating data storage in an information search and retrieval system, particularly in an enterprise search system, wherein the system implements indexing and search applications and comprises a suitable search engine, and data storage devices and a data communication system which together realize a network storage system provided with an application interface, the network storage system divided in distinct logical volumes which are associated with the physical data storage units and configured depending on the application in one of a read-write mode mounted on one computer, a read-only mode mounted on one or more computers, or a floating and unmounted mode.
摘要:
In a method for information access, search, and retrieval over a data communication system generally, wherein a query is applied to a set of documents, a result set of the matching documents and query-dependent subsections of the matching documents are identified. The method comprises computing summary information on document scopes, values and associated weights across the result sets and weighting the values with a summary value metric which provides a measure of the probability of a value. In a search engine (100) capable of supporting and implementing the above method, the search engine comprises as per se known subsystems for performing search and retrieval in the form of one or more core search engines (101), a content application programming interface (102), a content analysis stage (103) and a client application programming interface (106) connected to the core search engine (101) via query analysis and result analysis stages (105; 106). In addition the search engine (100) for supporting the above method comprises a first module (108) for specifying summary value metrics (SVMs), second and third modules (109; 110) for creating scopes and for assigning summary value metrics (SVMs) to the created scopes, and a fourth module (111) for indexing scopes, values and SVMs.