| Patent application number | Description | Published |
|---|
| 20080291089 | Apparatus and Method for Computing Location of a Moving Beacon Using Time Difference of Arrival and Multi-Frequencies - Provided is an apparatus and method for computing the location of a radio beacon by using Time Difference Of Arrival (TDOA) and multiple frequencies. The apparatus and method of the present invention compute the location of a radio beacon without limitation in distance by using multiple frequencies and time difference of arrival to resolve the problem of phase ambiguity. A radio beacon location computing system includes a plurality of base stations configured to receive signals of multiple frequencies transmitted from the radio beacon, and detect and output phase differences and arrival time; and a location computing server configured to receive the phase differences and the arrival time outputted from the respective base stations, acquire calculation distances based on the phase differences, remove phase ambiguity from the calculation distances based on the arrival time, and compute the location of the radio beacon. | 11-27-2008 |
| 20080301307 | Rfid Tag for Ip Address-Based Rfid Service and Rfid Service Method Using the Same - Provided are a RFID tag and a method for providing a RFID service using the same. The RFID tag includes: a code type data denoting a code type of the RFID tag; and a content server IP address code denoting an IP address of a content server that provides content related to an item with the RFID tag attached. | 12-04-2008 |
| 20080309578 | Antenna Using Proximity-Coupling Between Radiation Patch and Short-Ended Feed Line, Rfid Tag Employing the Same, and Antenna Impedance Matching Method Thereof - Provided is an antenna based on proximity coupling between a short-ended microstrip feed line and a radiation patch, an RFID tag including the planar antenna, and an antenna impedance matching method thereof. The antenna includes a radiation patch configured to determine a resonant frequency of the antenna; a ground plate disposed in parallel to the radiation patch; and a feeding part disposed between the radiation patch and the ground plate and configured to provide radio frequency signals to a device connected to the antenna. The feeding part includes a feed line that is formed in a resonance length direction of the radiation patch and proximity-coupled with the radiation patch and one end of the feed line is shorted. The antenna freely controls the resistance and reactance of the antenna impedance independently and efficiently matched to a device connected to the antenna which has a predetermined impedance in wide bands. | 12-18-2008 |
| 20080316104 | Apparatus and Method for Computing Location of a Moving Beacon Using Received Signal Strength and Multi-Frequencies - Provided is an apparatus and method for computing the location of a radio beacon by using received signal strength (RSS) and multiple frequencies. The apparatus and method of the present invention computes the location of a radio beacon without limitation in distance by using multiple frequencies and received signal strength to resolve the problem of phase ambiguity. A radio beacon location computing system includes a plurality of base stations configured to receive signals of multiple frequencies transmitted from the radio beacon, and detect and output phase differences and received signal strength; and a location computing server configured to receive the phase differences and the received signal strength outputted from the respective base stations, acquire calculation distances based on the phase differences, remove phase ambiguity from the calculation distances based on the received signal strength, and compute the location of the radio beacon. | 12-25-2008 |
| 20080316105 | Method and Apparatus For Transmitter Locating Using a Single Receiver - Provided is a method and apparatus for locating a transmitter. The apparatus for locating a transmitter, including: an antenna having an antenna array for receiving first and second frequency signals transmitted from the transmitter and measuring an angle of the transmitter; a range of transmission (ROT) calculating unit for calculating the range of transmission of the transmitter based on phase difference between the first and second frequency signals; an angle of arrival (AoA) calculating unit for calculating the angle of the transmitter based on phase difference of common frequency signals received in the antenna; and a transmission location determining unit for determining the location of the transmitter based on the range of transmission and the angle of arrival of the transmitter. | 12-25-2008 |
| 20090016305 | METHOD FOR AVOIDING AND OVERCOMING INDIRECT COLLISION IN BEACON-MODE WIRELESS SENSOR NETWORK - There is provided to a method for avoiding indirect collision of beacon, including: collecting beacon information of neighboring nodes and allocating a time slot based on the collected beacon information; transmitting information on the allocated time slot to the neighboring nodes depending on time slots of the neighboring nodes; and checking whether the time slot overlaps based on a reply message from the neighboring nodes and reallocating a time slot upon occurrence of overlapping. | 01-15-2009 |
| 20090209283 | SYSTEM WITH SHARED POWER AMPLIFIER FOR MOBILE COMMUNICATION TERMINAL WITH MOBILE RFID FUNCTION - Provided is a power amplifier sharing system for a mobile communication system having a mobile Radio Frequency Identification (RFID) function, particularly, a power amplifier sharing system that can reduce the power consumption and the size of a circuit in a mobile communication terminal having a mobile RFID function. The system includes a mobile communication transceiver for transmitting/receiving a mobile communication signal; a mobile RFID transceiver for transmitting/receiving a mobile RFID signal; a power amplifier for amplifying a signal; a switch for connecting the mobile communication transceiver and the mobile RFID transceiver to the power amplifier; and a transceiver controller for controlling the switch and the power amplifier. | 08-20-2009 |
| 20090219116 | Cable to waveguide transition apparatus having signal accumulation form of backshort and active phase shifting using the same - A cable to waveguide transition apparatus having a signal accumulation form of a backshort is disclosed. The cable to waveguide transition apparatus having a signal accumulation form of a backshort, includes: a waveguide; a RF probe for transferring a radio frequency (RF) signal to the waveguide; and a backshort having the signal accumulation form for reflecting the RF signal excited from the RF probe, wherein the backshort reflects a first fundamental frequency signal excited from the RF probe to have a phase identical to a phase of a second fundamental frequency signal excited from the RF probe to an aperture of the waveguide, and reflects a first 2-order harmonic frequency signal excited from the RF probe to have a phase reverse to a phase of a second 2-order harmonic frequency signal excited to an aperture of the waveguide in order to eliminate the 2-order harmonic frequency signal. | 09-03-2009 |
| 20090274127 | METHOD FOR DETERMINING SUPERFRAME FOR BEACON SCHEDULING - Provided is a method for determining superframe to efficiently perform beacon scheduling by allocating superframe lengths which are different according to a routing depth of sensor nodes in a ZigBee based wireless sensor network. The method for determining a superframe for beacon scheduling, includes the steps of: receiving a beacon from a neighboring node and grasping information on a superframe used by the neighboring nodes; and determining a transmission time and a length of own superframe based on superframe information of the grasped neighboring node. | 11-05-2009 |
| 20090285140 | Method for Managing Dormant Nodes in Wireless Sensor Network - Provided is a method for managing dormant nodes in a wireless sensor network. The method includes the steps of: a) acquiring and storing information on distance and location of sensor nodes registered in a corresponding cluster among at least one cluster managed by a managing node; b) selecting a dormant object node among the sensor nodes by the managing node; c) transmitting dormant information that the dormant object node should go into a dormant state for a predetermined period through a beacon message to the dormant object node and creating a dormant node management table; and d) updating a dormant time of the dormant node management table every beacon cycle by the managing node according to setup of a dormant time central managing function and notifying dormancy expiration to the corresponding dormant node. | 11-19-2009 |
| 20100008275 | NODE SYNCHRONIZATION SYSTEM FOR LOW-POWER IN SENSOR NETWORK AND METHOD THEREOF - Provided are a node synchronization system for low-power in a sensor network and a method thereof. The node synchronization system includes: a network transmitting means for transmitting information on a synchronization time difference to the sensing data collecting means and transmitting sensing data to a network; the sensing data collecting means for receiving synchronization time information from the network transmitting means, being synchronized with the network transmitting means, collecting the sensing data from a sensing means, and transmitting the sensing data to the network transmitting means; and the sensing means for receiving synchronization time information from the sensing data collecting means, being synchronized with the sensing data collecting means, sensing a sensing peripheral environment information, and transmitting the sensing data to the sensing data collecting means. | 01-14-2010 |
| 20100089993 | APPARATUS AND METHOD FOR COLLECTING SHOPPING INFORMATION USING MAGNETIC SENSOR - Provided are an apparatus and method for collecting shopping information using a magnetic sensor. The shopping information collecting apparatus, includes: a magnetic value sensing and analyzing means for sensing and analyzing a magnetic value within own zone in real-time; a central processing means for processing shopping information based on the magnetic value analyzed by the magnetic value sensing and analyzing means; and a shopping information transmitting means for transmitting shopping information processed by the central processing means. | 04-15-2010 |
| 20100321150 | SYSTEM AND METHOD FOR GUIDING VISITOR USING SENSOR NETWORK - Provided are a system and method for guiding a visitor using a sensor network. The system includes: an entry approval requesting unit for requesting an entry approval of the visitor to the visitee terminal according to destination information; a route setting unit for setting a route along which the visitor terminal is to move to the destination, based on the destination information of the visitor, according to an entry approval result of the visitee terminal; a location detecting unit for detecting a current location of the visitor terminal based on identification information of the visitor terminal and location information of the sensor node, the identification information and the location information being obtained through the sensor network on the route; and a location confirming unit for confirming if the detected current location of the visitor terminal is out of a preset area. | 12-23-2010 |
| 20100322125 | REMOTE CONTROL METHOD OF SENSOR NODE FOR LOW-POWER AND SENSOR NETWORK THEREFOR - Provided are a remote control method of a sensor node for low-power and a sensor network therefor. The remote control method, including: generating an interrupt signal when a node receives a remote control signal from a corresponding micro radio frequency (RF) processor installed in a gateway; regenerating the interrupt signal when the node is not converted from a sleep mode to a wake-up mode; collecting sensing data by communicating with other nodes when the node is converted from the sleep mode to the wake-up mode; and converting from the wake-up mode into the sleep mode when the communication is completed. | 12-23-2010 |
