Abstract: A multi-level meshed security network. The network includes a first level having a plurality of base units, supporting relatively high power RF communications, and a controller function. The second level has a plurality of transponders, supporting relatively low power RF communications, and at least one sensor. Each of the components of the first level communicates with each other and with each of the components of the second level.

Abstract: A wireless communication device, an individual information writing device, and an individual information setting method that efficiently write individual information, such as a unique identifier used for wireless communication, to each wireless device. An address writing device transmits a unique address setting communication request. A wireless device has a control unit that checks whether a provisional address is set in a unique address memory. When a provisional address is set, the control unit measures the signal intensity of a received unique address setting communication request with an electric field intensity measuring unit. When the electric field intensity is greater than a threshold value stored in an address setting condition memory and thereby satisfies an address setting condition, the wireless device performs a process for setting a unique address and then transmits a completion notification to the address writing device.

Abstract: A master controller for managing items tagged with radio-frequency identification (RFID) tags includes a transceiver to transmit interrogation signals to the RFID tags and to receive response signals from the RFID tags. The master controller may also include a processor to determine the proximity of tagged items based on signal levels of the response signals, and to notify a user when certain ones of the tagged items are in a predetermined relation to a proximity threshold.

Abstract: A personal articles tracking system, method and apparatus. In the system of the invention, a radio frequency identification (RFID) reader can be coupled to a tracking processor. A data store further can be configured to store tag data from corresponding RFID tags. Finally, an alert can be programmed to activate when the tracking processor no longer can sense within range of the RFID reader an RFID tag having corresponding tag data stored in the data store.

Abstract: An alert transceiver in commuter vehicles in a line-of-site warning area receive line of sight (LOS) alert signals from another vehicle, such as an emergency vehicle. Upon detecting the LOS alert signal, the alert transceiver can relay the alert signals to other alert transceivers in commuter vehicles within a warning zone that are outside of LOS zone, thereby creating mobile tracking network (MTN). The alert signals can include any relevant information, such as information regarding a hazard that includes the type of hazard (emergency vehicle, fire, ambulance, etc.), the time stamped location, direction of travel, speed and planned route for the emergency vehicle; and/or the coordinates of warning zone as determined by alert transceivers.

Abstract: An initiative alarm system mainly comprising a first alarm device and a second alarm device; said first alarm device continuously or alternately transmitted an encoded signal within a certain frequency. In the other hand, said second alarm device includes a receiver for receiving the signal, a CPU for decoding the signal and determining the correctness of received signal, and a siren interconnected with CPU and trigged when the signal is fail to be received or fail to be received within certain frequency. Said second alarm device is hand-hold by a guardian and said first alarm device is carried by a protective object so as when the first alarm device is kept away beyond the certain distance. The signals will be transmitted immediately, and then, the siren is simultaneously triggered.

Abstract: An apparatus for indicating detection of an onset of a high-voltage condition at an output locus of a signal converter device, the signal converter device including a switching network for switchingly controlling a potential at a circuit node coupled with the output locus in response to a control signal received from a control signal source, includes: (a) a first sensing unit coupled for sensing a parameter at the circuit node; (b) a second sensing unit coupled for sensing the control signal; and (c) a comparing device coupled with the first sensing unit and with the second sensing unit; the comparing device effecting comparison of a first signal from the first sensing unit with a second signal from the second sensing unit. The comparing device effects the detection when the first and second signals have a predetermined relationship, then the apparatus effects the indicating.

Abstract: A chaotic wireless communication apparatus for transmitting/receiving data based on a chaotic signal is provided. The apparatus includes a chaotic Radio Frequency (RF) processing means and a digital modem. The chaotic RF processing means includes a chaotic RF receiving unit for extracting a spreading digital signal from an RF signal using a chaotic signal as a carrier signal, and a chaotic RF transmitting unit for transforming the spreading digital signal into the chaotic signal. The digital modem a digital demodulating unit for dispreading spreading digital data extracted from the chaotic RF receiving unit and creating information data to be received, and a digital demodulating unit for spreading information data to be transmitted and creating the spreading digital signal.

Abstract: The invention concerns a system and a method of monitoring live beings, which combines zone and water alarms, including an alarm unit to be arranged on a being's body and a portable alarm centre handled by a person that monitors the being, wherein the alarm unit includes a sender for continuous wireless transfer of intermittent signals on a first channel and transfer of an arbitrary type of signal on a second channel, and wherein the alarm centre receives signals sent from both channels for status monitoring of the alarm unit. Activation of an alarm is achieved in the alarm centre when the intermittent signal differs from a predetermined intermittent signal state. The arbitrary type of signal is sent on the second channel or channel 2 when a water sensor, included in the alarm unit, detects contact with a predetermined quantity of water. Signaling on the first channel is turned off by a switch in the alarm unit when the arbitrary type of signal is sent to the alarm center.

Abstract: A lid opening and closing system for a waste container having an opening and a lid for covering the opening, the system including a proximity sensor, which may be a capacitive proximity sensor, for sensing the presence of a user's hand or body near the waste container and for sending a control signal. A drive system is connected to the lid for causing the lid to move from a closed position, where the lid covers the opening, to an open position, where the waste container is positioned to accept waste, and then back to the closed position in response to the control signal. The proximity sensor being more sensitive to the user's hand or body approaching from the top of the waste container rather than from the front, sides or back of the waste container.

Abstract: A method for testing the installation of a box includes the steps of closing the lid of the box, transmitting a signal from the box; noting the absence of an annunciation; and variously repositioning the box relative to a receiver, replacing a battery, or replacing the box.

Abstract: A transmit antenna (3) is supplied with energy by a power supply unit (2). An electrical value characteristic for the transmit power is compared to a comparison value and the length of a time interval is measured in which the characteristic value at least reaches or exceeds the comparison value. Depending on the length of this time interval the transmit power is set.

Abstract: A monitoring system for a valuable item, such as a digital device, has a base unit affixed to the valuable and a remote unit carried by a person responsible for the valuable. Signals are exchanged between the base and remote units. The base continuously monitors for signals from the remote unit and can arm or disarm automatically in response to such signals. When armed, the base communicates with a program running on the valuable to lock peripherals. The base alerts the owner upon movement of the valuable, allowing the owner to screen for false alarms or be notified of an occurring theft attempt. A digital connection between the base and the valuable may be used to encrypt any data stored on the valuable and charge the internal batteries of the security device. A soft switch enables the base to be powered off by the corresponding remote unit.

Abstract: A system and method for proximity control of a barrier comprises a stationary wireless signal receiving device and a mobile transmitting device. The wireless signal receiving device may monitor at least one transmitting device within a predetermined coverage area and may be a radio frequency receiver or a spread spectrum receiver located near the barrier. In one embodiment, the transmitter device emits a control signal that is received by the receiving device when the transmitter is within a reception range. In one embodiment, the control signal includes transmitter identification information, directional information and position information. In another embodiment, the barrier is closed only after a predetermined delay has lapsed.

Abstract: The present invention is directed to a position isolation system comprising at least one portable cellular transmitter adapted for wireless data communication via an associated cellular communication system. Data exchange between the at least one cellular transmitter and an associated tracking station is initiated via the associated cellular communication system. The data exchange obtains additional position data representing an associated, cellular relay system through which the cellular data exchange is made, enabling isolation of the location of the portable cellular transmitter in a limited geographic region. The position isolation system also includes a secondary transmission system, associated with the portable transmitter, that is adapted for outputting information representing secondary location data. The secondary location data has a positioning resolution within that of the limited geographic region.

Abstract: A vehicle burglar alarm system includes a global position system installed in a vehicle for receiving a satellite signal, and an on-vehicle main unit installed in the vehicle and electrically connected with the global position system, the on-vehicle main unit having a first flag, the first flag having a first status without satellite signal and a second status with satellite signal for indicating satellite receiving status of the global position system, the on-vehicle main unit being to output a relocation signal immediately after changing of the first flag from the first status without satellite signal to the second status with satellite signal during burglar alarming mode.

Abstract: A direction finder is disclosed that is a hand-held device used to locate a vehicle in a parking lot using a two way radio link, operating in an unlicensed freely available band of the radio spectrum. Made for outdoor use, it is independent of GPS systems, cellular telephone systems, Loran, and any other system with a large infrastructure.

Abstract: Methods and apparatus are provided for locating one among many items equipped with RFID tags. The apparatus comprises a portable system interrogating the RFID tags and receiving responses therefrom that depend at least on their bearing angle. A comparator selects responses from the one item and ignores others. An annunciator indicates the presence of the one item in the interrogator field of view and, desirably but not essentially, its relative proximity. A directional antenna whose beam pattern is limited in azimuth and/or elevation provides bearing angle information. Its field of view becomes progressively smaller as the antenna approaches the one item so that a user can substantially pinpoint its location without needing any of the usual RFID infrastructure. Tag response hit rate and/or signal strength provides range related information to the interrogator. Optionally, the presence of each new tag is announced until all new tags have been identified.

Abstract: The present invention is directed to a method of asset location. The method includes the step of linking at least one portable transmitter system with a selected asset. A cellular communication is then initiated from the at least one portable transmission system to an associated device controller. Primary location information representing the cellular area from which the cellular communication is made is then communicated to the device controller. A secondary location system is then initiated in accordance with the location information. The secondary location information, from the portable transmission system, is then broadcast and received into a tracking system. The method of asset location includes the steps of simultaneously monitoring a plurality of portable transmission system communications, and generating fee data representing each of a plurality of monitored portable data transmissions.

Abstract: A method and system for monitoring the availability of medical aids for a patient. A first signal transmitter is mounted on the aid for transmitting first electromagnetic signals. A second signal transmitter is worn by the patient and has a warning device for outputting a warning signal which can be perceived by the patient. A receiving unit receives the first electromagnetic signals transmitted by the transmission unit. A control unit actuates the warning device to output the warning signal when the first electromagnetic signal is received and when a predetermined reception strength for the first electromagnetic signal is undershot and when a particular item of information associated with an operative state of the medical aid is transmitted with the first electromagnetic is received.

Abstract: A system utilizing a transmitter emitting a unique signal and a base station receiver having a database of household members is used to ascertain the identity of household members who are home at any particular time. Such information is used by the local telephone network to provide specialized telephone services to the household based on the identity of the household members who are home. A manual and emergency services override is provided to permit the completion of telephone calls from emergency services personnel and other persons irrespective of the presence or absence of any household member. The information regarding the presence or absence of household members also may be used to intelligently provide other household services such as heating and cooling or home security depending on the identity of persons who are home.

Abstract: A portable electronic signature system includes a base unit and a wireless remote unit that incorporates graphic tablet digitizer for signaling to a PC of the base unit signature data of a stylus being moved to produce a handwritten signature. The base unit transmits trigger signals for recognition by the remote unit, which also transmits identification signals to the base unit, respective alarms being activated in both the base and remote units in the event that recognition of the identification signals is interrupted by the remote unit being transported out of range. Also disclosed are a method for using the system, a cannister having a wireless alarm for use in a mechanical transport system, and the cannister in combination with a base unit.

Abstract: A system for monitoring movement of a person. The system includes a mobile transmitter that is affixed to the person to be monitored. The transmitter transmits radio signals to a receiver that may be used to track the person. The receiver may include an indicator that shows when the receiver is proximate the person. The indicator changes intensity as the distance between the transmitter and receiver changes.

Abstract: This invention provides an object locator to locate a variety of target objects. A selective directional transceiver is used to determine the relative direction of the target object, even in a multiple-story building, from a hand held component of the object locator. And moving the hand held component toward the target object according to the relative direction shall allow the user to quickly locate the target object. The hand held component may keep a list of identifications of multiple target objects in the memory and locate them one by one. A voice recognition unit and a key stroke recognition unit in the hand held component shall allow the user of the object locator to easily locate the object by voice and/or key stroke. To share the hardware, software, memory and the display unit of an existing device like cellular phone hand set, personal digital assistant, or car alarm remote, the object locator may be embedded in it, and expand its additional application.

Abstract: A child distance and alerting system comprising a transmitter unit to be attached to a child's clothing and a receiver unit to be carried by a parent or guardian supervising the child, for preventing the child from wandering too far and becoming vulnerable to predators. The transmitter unit includes a disc-shaped body, a pin portion extending outwardly therefrom for piercing an article of clothing, and a pin-receiving component adapted for releasably clamping the pin portion so that the transmitter unit can be attached to the child's clothing. Once the pin portion and the pin-receiving component are properly joined, the transmitter unit cannot be removed from the child's clothing except by use of a special tool. The transmitter unit is designed to transmit radio frequency signals when it is attached to the child's clothing and remains activated until the pin-receiving component is removed from the pin portion.

Abstract: A radio wave detection device including an electric wave receiving/amplifying circuit, a rectifying circuit, a peak-to-peak amplifier, a central processor, a power supply, a reference resistance circuit and a sound/light output unit. The electric wave receiving/amplifying circuit includes an antenna for receiving radio signal in the environment. The radio wave with a specific frequency filters through a wave filter and then is amplified. The rectifying circuit converts the radio signal into analog level voltage which is output to the central processor and peak-to-peak amplifier. In a preset condition, the peak-to-peak amplifier converts the level voltage into a controlling signal which is output to the central processor. The central processor also receives various comparison level voltages generated by the reference resistance circuit and compares the reference level voltage with the level voltage (and the controlling signal).

Abstract: There is disclosed a location search system which detects a position coordinate of a data processing device based on received radio wave information transmitted from the data processing device having a wireless communications function. The location search system includes a server including a search unit which searches region information specifying a location of the data processing device from a region information database based on calculated position coordinate information.

Abstract: A system and method for proximity control of a barrier comprise a stationary wireless signal receiving device and a mobile transmitting device. The wireless signal receiving device may monitor at least one transmitting device within a predetermined coverage area and may be a radio frequency receiver or a spread spectrum receiver located near the barrier. In one embodiment, the transmitter device emits a control signal that is received by the receiving device when the transmitter is within a reception range. In one embodiment, the control signal includes transmitter identification information, directional information and position information.

Abstract: A portable reconfigurable geolocation system is provided. The system includes a portable user node and one or more portable pseudolite nodes in communication one another and with the user node. Each of the user nodes and pseudolite nodes includes a transmitter that generates a signal on one or more carrier frequencies. Each signal is modulated with digital signals necessary to establish distances between the nodes and to convey data between the nodes. Each node also includes a receiver for receiving and demodulating the signals transmitted between the nodes, and a processor for receiving the demodulated signals, extracting data values and derived values from the demodulated signals and determining a three-dimensional position of each node in the system.

Abstract: A control and detection system for control of an object connected to the system, and for detection of object location in case of disappearance, theft or shifting of object, whereby the system has communication from each object at least to one data receiving device (3), (6) and from there data transmission (7) to the control unit. The system comprises an active short range transmitter that can be activated for function, furnished with a code of its own and placed in an object in the control area, a safety module monitoring the presence of the transmitter placed in an object in the area and/or detects a sender arriving to the area, base station of communication with connection to the control centre and the safety module.

Abstract: Method and apparatus to provide a wireless tether system is described. In one embodiment, one or more wireless tether apparatuses are in wireless communication with one or more base units. A wireless tether apparatus may be configured such that when separated from a base unit greater than a predetermined distance, such a wireless tether apparatus provides information to the user of the wireless tether apparatus to aid a user such as a human, animal, or machine in finding their way back to a desired location. A predetermined distance may be configured to change over time to accommodate different tether distance requirements at different times, e.g., closer to a home location at night and further away from the home location during the day. In one aspect, wireless tether apparatuses and base units communicate using a plurality of different communication modes such that when one mode fails other modes are utilized to reestablish a connection therebetween.

Abstract: A system and a method for monitoring objects including infants. The system and method having a first transmitter attached to the object to be monitored, the first transmitter transmits an ID corresponding to the first transmitter. A transceiver associates transmitters by storing in memory IDs of respective transmitters. The transceiver receives the ID corresponding to the first transmitter and compares the received ID with the stored IDs. An alarm is activated upon failure of a preset condition based on signals received by the transceiver.

Abstract: An electronic personal monitoring device that informs the user, i.e. tutor or guardian, when an unauthorized person has come too close to the protected person, i.e. target person, or when the target person moves or has been moved outside a calculated tutor monitoring range wherein the device continually monitors, i.e. self-monitoring, so long as the alarm system is enabled and produces an alarm signal when triggered, which may be a silent or vibration alarm, audible alarm or visual alarm.

Abstract: A weight-sensitive mat or other sensor determines whether a child seat in a vehicle is occupied, a transmitter is proximate to the sensor, and a keychain fob or other portable unit includes a receiver and an alarm. Generally, if the child seat is occupied and the keychain fob is removed from proximity to the transmitter, the transmitter communicates this to the keychain fob receiver and the alarm is activated. Exemplary embodiments include an add-on kit including a base unit with a transceiver for use with existing car seats having a base and a detachable shell, an add-on kit without the base unit for use with existing unitary car seats, a car seat with the child sensor, transmitter, and/or base unit built into it, and an automatic checklist feature for diaper bags, strollers, etc.

Abstract: A receiving unit and method for determining the distance of an object from a receiving unit in a monitoring system, the receiving unit receives transmitted signals, the receiving unit comprises an attenuating unit for attenuating the transmitted signals by a controlled factor; a receiver for receiving and processing the transmitted signals into readable data; a microcontroller for controlling the operation of the local monitoring unit; and an electronic circuitry for calculating the received strength signal indication, whereby the distance of an object from the receiving unit can be determined.

Abstract: A mobile device (MS) is disclosed comprising a GPS receiver (14) and an audible alarm (13, 15) configured to sound, during operation of the GPS receiver, in response to either adverse performance of the GPS receiver or to an event which is adverse or likely to be adverse to the performance of the GPS receiver. The alarm may sound in response to the inability of the GPS receiver to either acquire or track a GPS signal, or obtain or maintain a position fix. Also, the alarm may sound in response to movement of the GPS receiver, including acceleration and higher order movement of the GPS receiver, in so far as that movement is adverse to the performance of the GPS receiver.

Abstract: A surveillance and remote alarm system for persons subject to limitation of freedom of movement includes a fixed unit placed in the area within which the person can move and a personal bracelet element attached to the person subject to limitation of freedom of movement. The fixed unit is arranged to establish an electromagnetic connection with the personal element and a connection via a telephone line to an operations center. The fixed unit is equipped with a CPU associated with a fingerprint reader and a radio receiver arranged to interact with a similar radio transmitter fitted in the personal element together with a CPU that controls its operation. A sensor is provided to detect any interruption and/or anomalies in the connection between the fixed unit and the personal element and to send an alarm to the operations center.

Abstract: A locating device, particularly for locating trapped victims under avalanches, under debris or under collapsed buildings, equipped with a receiving unit (6-13) for signals from transmitters and preferably a transmitter (13, 14), as well as optical (6) and/or acoustic (12) display units, whereby the receiving unit is connected to three preferably orthogonally arranged ferrite rod antennas (2, 3, 4). All antennas (2, 3, 4) are disposed in a compact housing (1) together with the receiving unit (6-13) and preferably also the transmitter (13, 14) to ensure accurate locating of the trapped victim across the largest range possible at compact design whereby one antenna (4) is of substantially shorter length than the two other antennas (2, 3). The receiving unit is provided with a DSP module (11) for incoming signals of the antennas (2, 3, 4).

Abstract: An apparatus and method for an emergency vehicle alert system transmits signals from one or more emergency vehicles to nearby commuter vehicles. When an initiation switch in the emergency vehicle is activated, a transmitter broadcasts a unique identifier for the vehicle. Information regarding other characteristics such as position, speed, route, and direction of travel can also be transmitted to provide alert information to commuter vehicles in the vicinity of the emergency vehicles. The information is presented to occupants of the commuter vehicle and can include audio and visual displays such as lights, voice warnings, moving map display with symbols representing the vehicles' position relative to one another, and a textual display providing identification and distance information.

Abstract: Location-dependant personal organizer apparatus for operation with a memory for storing a plurality of appointment entries, each appointment entry including data specifying a time and a place; the personal organizer comprising: a locating unit capable of determining the location of the personal organizer; a clock capable of determining the present time; an alerting unit for generating an alert to a user; and an alert processor coupled to the memory, the locating unit, the clock and the alerting unit and capable of actuating the alerting unit at a period before the stored time for an appointment entry that is dependant on the stored place for that appointment entry and the determined location of the personal organizer.

Abstract: A mobile telephone includes a control device, which comprises a receiver to receive an enabling signal and a controller to enable operation of the mobile telephone in dependence upon the enabling signal. An active badge transmits the enabling signal. If the telephone and the badge are separated and the mobile telephone is no longer able to receive the enabling signal, then the controller disables the mobile telephone.

Abstract: A contactless data storage medium has at least two antennas, in each case for different transmission bands. This makes it possible to configure a data storage medium such that it can be operated with read/write units that operate in accordance with different standards. At least two of the antennas form a unit, so that a configuration such as this can be produced at very low cost.

Abstract: A method, and a device for its implementation, for locating a transmitter and receiver device, are provided. At least one first transmitter and receiver device transmits a request with a predetermined transmission power, this request is received by at least one second transmitter and receiver device with a predetermined receiving power and after successful receipt the second transmitter and receiver device, of which there is at least one, transmits a response signal, with the response signal only being transmitted if the field strength of the transmitted signal in the position of the second transmitter and receiver device exceeds a specific threshold value or is within a threshold range and the threshold value or threshold range is predetermined by the first transmitter and receiver device by transmission to the second transmitter and receiver device.

Abstract: A method and apparatus for a zone detection system in which assets and personnel to be monitored are assigned a transmitter that emits a transmitter signal that includes a common code and a unique code. Processing requirements associated with restricted zone monitoring are reduced by scanning received signals for the single common code or a relatively small number of common codes. Processing requirements associated with locating an individual transmitter are reduced by scanning for a single transmitter signal. Transmitter signals are relayed by sub-sector RF-relays to a centralized sector signal processing computer. One or more signal processing computers interface with a system controller that supports a centralized user interface configurable to manage one or more sectors.

Abstract: A method of determining the exact location of an individual in a structure includes at least one transmitter unit, at least three receiver units and a central processing unit (CPU). A single transmitter unit is attached to each individual in the structure. If it is desired to control temperature adjacent the individual, a temperature sensor is also included in the transmitter unit. A panic button signal may also be included as one of the transmitter outputs. The CPU receives data from the at least three receivers and determines the location of each individual in the structure and whether the area they are in requires temperature modification. The CPU is preferably capable of opening and closing motorized drapes or operating lighting according to a time schedule. A panic button may be included in the transmitter and the controller programmed to seek assistance.

Abstract: A personal electrical injury protection system is provided which can be worn by electricians, construction workers, or other individuals working around or with low-voltage lines (i.e. generally less than about 600 volts). The personal electrical injury protection system has both a proximity warning component which provides a warning of potential electrical hazards upon close approach to the low-voltage power line and an electrical contact protection component which turns off the power upon actual electrical contact with the power line. The present personal electrical protection system relies on a radio frequency transmitter attached to the worker or person to be protected and a radio receiver/controller connected to the power line. The radio frequency transmitter has a low frequency generator which is used for electrical-contact protection and a high frequency generator which is used for proximity warning.

Abstract: A method and an apparatus for determining whether an object is moved are provided. The object is disposed in a communication system having many base stations. The apparatus includes a receiver, a controller, and a warning device. During a predetermined period, the apparatus respectively receives and measures signals from each of the base stations to derive a first average value. Meanwhile, a tolerable probability value is inputted. According to the tolerable probability value and the first average value, the apparatus gets a tolerable range. Next, the apparatus continues to receive and measure signals to derive a second average value. Finally, the apparatus determines whether the object is moved in accordance with the second average value and the tolerable range. If moved, the apparatus sends out a warning signal.

Abstract: The objective of the present invention is to detect, using a universal method, any “movement” inside of the object being monitored, while maintaining the security of a container. The movement inside of the object to be monitored includes 1) a human movement when a human enters into a container to be monitored, 2) a movement to bring a foreign article in, 3) a movement to take cargo out. To achieve the objective, this invention uses the concept of a so-called “inside-seal”. In actual configuration, a plurality of communication units (communication nodes) are installed on the walls of the container. These communication units have a predetermined powered communication capability and form a communication network communicating with each other. A communication status between each node and all of the other nodes provided in the network, and a network graph matrix is generated which defines the nodal relationship between the nodes.

Abstract: A position locating device for identifying the distance and direction from a first object located with a user to a second object. The first object transmits a signal to the second object. The second object returns a signal to the first object. Microphones are arranged around the first object such that the time at which a microphone receives the returned signal is related to the direction of the second object relative to the first object. A receiver located at the first object decodes and analyzes the signal and its intensity to determine the distance of the second object.

Abstract: In order to provide a method for locating moving objects that will allow high precision in position determination and thus largely eliminate sorting errors, and also to provide a device suitable for executing the method, it is envisaged that on at least one defined location within the reading range of an interrogator (16) arranged in a stationary position, an interference pulse, which influences a response signal transmitted by a transponder (20) carried by a moving object (12) in response to a signal transmitted by the interrogator (16), is exerted on the object (12), and a position of the object (12) is determined in dependence on a time when the influence of the response signal occurred.