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1.发明公开A METHOD OF LOCALIZING STORAGE DEVICES, A MONITORING SYSTEM FOR LOCALIZING STORAGE DEVICES FOR GOODS, AND USE OF THE MONITORING EQUIPMENT 失效用于确定养DEVICES监测系统的位置FOR ISOLATION养器件FOR TRUE和监控系统的使用
公开(公告)号：EP0974136A1
公开(公告)日：2000-01-26
申请号：EP98914843.2
申请日：1998-04-07
发明人： PEDERSEN, Heine, Ewi
CPC分类号： G08G1/127 , G01S5/0027 , G01S19/14 , G01S2205/002 , G01S2205/008
摘要： The present invention relates to a method and a monitoring system, in particular for use in the monitoring of containers (4). Each container has a radio connection to positioning satellites of the GPS type (5), the SatCom type (6) as well as near field communications equipment from which data may be transferred to a data processing unit. Thus, according to the invention several possible radio connections are provided between the individual near filed communications equipment, it being first checked whether a connection can be established to the position satellite, and if this is not possible, it is attempted to establish a radio connection to the communications satellite. If this cannot be done either, then a radio connection is established to another near field communications equipment. The containers can hereby be monitored and tracked currently if for some reason they loose a radio connection. If the containers are placed at particularly difficult places, an embodiment of the invention comprises near field communications equipment which is not placed on any container and which can communicate with the containers and with the satellites.
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公开(公告)号：EP1050141A2
公开(公告)日：2000-11-08
申请号：EP99903597.5
申请日：1999-02-23
CPC分类号： H04L27/06
摘要： The invention relates to a method for simultaneous AM demodulation of data which are transferred between a transponder and an interrogator in connection with metal detection. The carrier wave signal is amplitude modulated by the information signal and is fed to an input of a receiver where it is branched into two parts, so that the first part is fed to a severe limiter, while the second part is fed to a first input of a mixer whose second input receives the output signal from the severe limiter. The two signal parts are multiplied in the mixer. A DC signal used for metal detection and an AC signal used for determining a possible information signal occur on the output of the mixer. The AM signal is fed to the receiver from an antenna which contains an adjusted circuit, which receives a signal galvanically separated from a generator. Signals from objects which partly contain a tag with identification data and partly do not contain a tag, may be used for detection and identification of objects.
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