Electronics and Telecommunications Research Institute

Dong Kyoo Kim

Jae Young Kim

Kwang Roh Park

Do Wook Kang

Wan Gyun Choi

Do Hyun Kim

Sang Joon Park

Jaehwan Kim

Hyung Soo Lee

You Jin Kim

Myung In Ji

Young Su Cho

Sung Jo Yun

Uzair Ahmad

Young Jin Kang

A method and an apparatus for removing a motion artifact of a radar are provided. The method includes: obtaining a radar signal for a target to be measured by the radar; measuring posture of the radar; estimating a motion artifact caused by movement of the radar based on a vertical angle, a horizontal angle based on the posture of the radar, and displacement; and correcting the radar signal according to the motion artifact. The posture of the radar includes the vertical angle at which the radar signal is radiated in a vertical direction about a central axis, the horizontal angle at which the radar signal is radiated in a horizontal direction about the central axis, and the displacement of the radar according to the movement of the radar.

Method and apparatus for removing motion artifact of unfixed radar

Provided is a radar device. The radar device includes a raising frequency converter configured to raise frequencies of split channel signals from a baseband to a different passband on the basis of a channel frequency, a transmission antenna configured to transmit the split channel signals received from the raising frequency converter to a target object, a reception antenna configured to receive split channel reflection signals received from the target object, a lowering frequency converter configured to lower the frequencies of the split channel reflection signals from a different passband to a baseband on the basis of the channel frequency, a transmission/reception driving unit configured to data-frame the split channel reflection signals received from the lowering frequency converter, and a device control unit configured to generate an integrated band response signal by using the data-framed split channel reflection signals.

Radar device and operation method thereof

Disclosed is a self-calibration method and apparatus for an array antenna system. According to an embodiment of the present disclosure, a correction method of an array antenna system includes: deriving, at a first time, a correction factor Rfor a path connecting an i-th (i is an integer equal to or greater than one and equal to or less than m) transmission antenna and a j-th (j is an integer equal to or greater than one and equal to or less than n) reception antenna; deriving, at a second time, a calibration factor {circumflex over (Q)}for the path connecting the i-th transmission antenna and the j-th reception antenna; and performing, based on the {circumflex over (Q)}, calibration on the path connecting the i-th transmission antenna and the j-th reception antenna.

Self-calibration method of switched array antenna radar

A method and an apparatus for measuring a displacement of an object according to steps of: dividing a signal into an I signal and a Q signal according to a phase of the signal, wherein the signal is reflected by the object after a transmission signal having a plurality of frequencies is emitted toward the object by the radar measurement system; estimating a direct current (DC) component from an N-tuple information acquired from the I signal and the Q signal; removing the estimated DC component to correct the I signal and the Q signal; and measuring the displacement of the object based on the corrected I signal and Q signal are provided.

Method and apparatus for measuring displacement of object using multiple frequency signal

The present disclosure herein relates to a biosignal detecting device and a biosignal detecting system including the same. According to an embodiment of the inventive concept, the biosignal detecting device is built in a vehicle seat. The biosignal detecting device includes an antenna block. The antenna block transmits a transmission signal to a person seated on the vehicle seat and receives a return signal corresponding to the transmission signal. The antenna block and one surface contacting the seated person are spaced apart from each other so that a distance therebetween is two times or more greater than a wavelength of the transmission signal. According to an embodiment of the inventive concept, through an optimized arrangement of the biosignal detecting device, the biosignal of the seated person may be exactly and effectively detected.

Biosignal detecting device and biosignal detecting system including the same

Disclosed is an apparatus for processing a radar signal, including: a transmitting unit which irradiates a plurality of baseband signals as a plurality of division band penetration signals to a target object based on a channel frequency; a receiving unit which receives a plurality of reflection signals reflected from the target object to integrate the received reflection signals as an integration band response signal; and a control unit which sets the channel frequency so that at least some bands of adjacent division band penetration signals among the plurality of division band penetration signals are overlapped with each other.

Apparatus for processing radar signal and method for processing radar signal

Provided is an apparatus and method for obtaining a radar signal, the apparatus including a radar transmitter to radiate a plurality of split band penetration signals toward a target object, and a radar receiver to receive a plurality of signals reflected from the target object, and to obtain a wideband response signal using the plurality of reflected signals.

Apparatus and method for obtaining radar signal

A method and apparatus for estimating a position of an access point (AP) includes (a) measuring a strength of a signal, transmitted by the AP, at three or more measurement points (MPs), (b) selecting an imaginary attenuation factor, (c) calculating a range between the AP and each of the MPs on the basis of the imaginary attenuation factor and a strength of a signal measured at the MP, (d) calculating an intersecting point of ranging circles in each of which a position of the MP is a center and the range between the MP and the AP is a radius, (e) calculating a best intersecting point from among a plurality of the intersecting points obtained by repeating the steps (c) and (d) while changing the imaginary attenuation factor, and (f) estimating the best intersecting point as the position of the AP.

Method and apparatus for estimating position of access point in Wi-Fi system

Provided are a channel equalization and carrier recovery method and a receiving apparatus thereof. In the method, a receiver of the high speed wireless communication system obtains an initial value of a channel equalization coefficient through non-causal channel estimation in a frequency domain during a preamble transmission section of a packet. High-order QAM signal correction for updating the channel equalization coefficient in a time domain is performed during a data transmission section of the packet. when a payload section starts in the data transmission section of the packet, channel equalization coefficient tracking is performed on the basis of frequency domain decision, and a hard decision of a correction value by the high-order QAM signal correction in the time domain is made to correct carrier phase errors, so that the channel equalization coefficient is updated.

Channel equalization and carrier recovery method and receiver in high speed wireless communication system

Provided are a system for channel sounding of broadband single carrier mobile communications and a method thereof. A channel sounding device is provided, which achieves precise modeling of a broadband mobile communication in a 5 GHz band. The channel sounding device can perform precise channel modeling by collecting broadband channel data of 20 MHz between a base station and a mobile station moving at maximum 150 km/h, using a sounding signal including a 802.15.3 preamble, a maximum length sequence (MLS) signal, and a single carrier frequency domain equalization (SC-FDE) symbol overcoming a limitation of signal distortion of an orthogonal frequency division multiplexing (OFDM) signal. The channel sounding device can simultaneously perform modeling of interference of an adjacent channel as well as a transmission channel.

System for channel sounding of broadband signal carrier mobile communications and method thereof

A modulation device uses two base signal axes including a cosine function and two base signal axes including a sine function to modulate bit information and generate a modulation symbol. Accordingly, the frequency efficiency characteristic is improved while maintaining a great power efficiency characteristic.

Growing community of inventors

Daejeon, South Korea

Dong Kyoo Kim