摘要:
A system for inferring a set of characteristics and method for inferring an electronic rendering (170) of an environment (110) comprises a plurality of devices (341 and 345) and a processing device. Each wireless device is capable of determining a distance between a neighboring wireless device. Moreover, each device is capable of performing at least one of the following: determining an environmental attribute of the environment, and determining a location of an object in the environment. The processing device gathers information determined from the plurality of devices and infers the set of characteristics electronic rendering of the environment based on the information gathered.
摘要:
Die Erfindung betrifft ein Verfahren und ein nach dem Verfahren arbeitendes System, das darauf beruht, dass Ultraschallsignale von einem oder mehreren in einem Überwachungsgebiet ortsfest angeordneten US-Sendern abgestrahlt werden und in einem im/am zu ortenden Objekt angeordneten Empfänger empfangen werden, wobei die Empfangszeiten registriert werden. Aus dem Sende- und Empfangszeitpunkt jedes Ultraschallsignals, welche bekannt sind bzw. ermittelt werden, wird nun die Laufzeit jedes Signals und damit der Abstand zwischen dem jeweiligen US-Sender und dem US-Empfänger ermittelt. Die ermittelten Laufzeiten werden über ein drahtloses Kommunikationssystem vom US-Empfänger an eine zentrale Steuerungseinrichtung übertragen. In der Steuerungseinrichtung kann mit Hilfe bekannter geometrischer Methoden anhand von mindestens drei Laufzeiten und den bekannten Positionen der zugehörigen US-Sender der Standort des US-Empfängers und damit des Objekts ermittelt werden.
摘要:
A system for locating a number of devices (112-130) by measuring signals transmitted between known location devices (112-118, 134-138, 214-218, 224-228) and unknown location devices (120-130, 222), and signals transmitted between pairs of unknown location devices (120-130,222), entering signal measurements into a graph function that includes a number of first sub-expressions, a number of which include signal measurement prediction sub-expressions, and have extrema when a predicted signal measurement is equal to an actual signal measurement, and optimizing the graph function.
摘要:
The present invention includes a tracking device that is associated with a cargo container. The cargo container is used for shipping of goods and materials and is placed into transportation vessels for shipment. The tracking device includes a GPS for receiving positioning information concerning the location of the cargo container and is adapted to transmit the location of the cargo container remotely. Sensor(s) are also operatively associated with the cargo container and tracking device to sense information concerning the surroundings of the cargo container. The tracking device receives this sensor information and deactivates the tracking device when the cargo container is either inside or in proximity to the aircraft.
摘要:
A system which allows a central control unit to track automatically the positions of a fleet of mobile units. Each mobile unit carries a position updating apparatus which includes means (2) to determine its position, and processing means (4) in the form of computing equipment in communication with the position determining means. The processing means (4) in turn controls a transmitting means (6), such as a radio transmitter of the private mobile radio system that the mobile unit uses for communication, for transmitting information to the central control. The position determining means (2) and processing means (4) are arranged to send the latest position of the mobile unit to the central control at intervals. The processing means (4) stores a number of rules for determining the interval between the transmission of position update messages to the central control. These rules are based upon the direction of travel of the mobile unit and other factors, such as its location.
摘要:
The invention comprises an arrangement with which mobile objects can be located in particular areas. The mobile objects for locating, e.g., persons or inanimate objects, are provided with a data carrier which determines the absolute position using a position-determining system such as e.g., GPS. For many applications, it is not always necessary to know the absolute position of the object. Information about the area in which the object is located is usually sufficient. In order to optimise the exchanging of data between the application that requires the location of the data carrier and the object itself, the absolute position of the objects is transmitted to an information unit when the data carrier is initialised. Said information unit translates the co-ordinates using a digitised map or a plan divided into areas so that the object can be allocated to a corresponding area. This data is stored in the information unit. The boundaries of the area in which the object is located are transmitted to the data carrier and if the object changes its position, the data carrier itself can determine whether the object has left an area. If the current position of the data carrier no longer matches the area information, the data carrier reports its position to the information unit again. If an application requests the position of a data carrier, the information unit transmits the data carrier area information that has been stored to the application. This results in optimal communications between the applications and the data carriers. The position of the data carrier can be established even when the data carrier cannot be reached momentarily.
摘要:
A shipboard terminal (1) is provided on each of a plurality of boats. This shipboard terminal collects the outputs of a plurality of sensors (3) which detect the state of the boat's engine, plus the output of the GPS unit carried on the board. It periodically compares the outputs of this plurality of sensors with their pre-recorded normal ranges, and displays an alarm when a normal range is exceeded. It automatically transmits to a shore terminal (2), via a portable phone network, the data output from the plurality of sensors and the positions data output by the GPS unit, during each communication time which has been allocated to the boat in accordance with time data contained in the output of the GPS unit. The shore terminal (2) receives this data via the public switched telephone network, and records it. This system facilitates the monitoring, via software, of the state of small leisure craft or coastal fishing boats not exceeding several tens of tons, such boats being operated by crews with little knowledge or experience of marine engines. It thereby promotes the safe operation of such boats.
摘要:
A navigation information system comprises a communications system having a fixed part (11 to 20) and at least one mobile part (1 to 10), the fixed part including a data storage and processing means 15 for identifying the location of a mobile unit, generating guidance information appropriate to that location and transmitting it to the mobile unit. The data exchange is by means of DTMF codes. By locating most of the complexity with the service provider, in particular the navigation computer 15 and geographical database 17, the system can be readily updated and the capital cost of the in-vehicle system, which in its simplest form may be a standard cellular telephone 1, can be minimised. The user makes a request for guidance information, and the system, having determined the user's present location, then transmits instructions to the user. The user's present location can be determined by means such as a Satellite Positioning System 7.
摘要:
A mobile local area network (LAN) of tracked assets utilizing minimal power and bandwidth allows a large number of assets to be tracked in a practical manner. The mobile LAN is established between a plurality of tracking units in close proximity. Assets are approximately located according to their connection in the mobile LAN where the exact location of at least one of the network nodes is known. Each tracked asset has capability to independently determine and report its position to a central station, and each asset also has capability to communicate locally with other cooperative assets via the LAN. The LAN is dynamically reconfigurable so that as other cooperative assets come into proximity, they can join the network, and as others move away, they can leave the network. Within the network, a protocol is followed which assigns one of the assets to be the "master" and all others to be "slaves". The master asset takes responsibility for determining its own exact geographical position via LORAN, OMEGA, Global Positioning System (GPS) or other navigational aid. When connected in a LAN, slave assets report their ID to the master asset and do not determine their own locations in order to conserve power. The master reports its location and ID, as well as the IDs of the other assets in the LAN, to the central station. Uncertainty in the location of a slave asset is limited by the known possible geographical extent of the LAN which is known a priori .