Electronics and Telecommunications Research Institute

Gwang Moon Park

Haeng Sook Ro

Byung Chan Kim

Ki Cheol Tae

Soo Ho Sohn

Kang Hee Kim

Yong Seok Choi

Sang In Cho

A directive direction finding apparatus may comprise: a directivity-enabled antenna array in which a constituent antenna or antenna subarray has directivity in the same direction; an RF/IF receiver connected to the directivity-enabled antenna array; a digital receiver connected to the RF/IF receiver; a direction finder connected to the digital receiver; a directivity control unit to control an operation of the directivity-enabled antenna array; and a transport/control interface connected to the direction finder and to manage control and operation of the directivity-enabled antenna array, the RF/IF receiver, the digital receiver, the direction finder and the directive control unit.

Method and apparatus for the directive direction finding

A weak signal detection device for detecting a weak signal appearing intermittently with a level that is less than or equal to internal noise of a radio frequency (RF) receiving part may comprise: a cross-correlation spectrum processing part configured to generate a cross-correlation spectrum using a correlation between RF receiving channels; and a waveform combiner configured to generate an output spectrum having a spectrum persistent function by assigning weight values to a current waveform and a previous waveform of the cross-correlation spectrum.

Method and apparatus for detecting weak signals

In the present invention, in classifying modulation types of a plurality of modulation signals by using a classifier (an artificial neural network model based on machine learning), the classifier may classify the modulation types of the modulation signals by using pieces of I/Q data, sampled with one sampling frequency, as input data, and thus, may quickly classify the modulation signals.

Method of determining single sampling frequency of classification target signal in order to predict modulation type of classification target signal, and method and apparatus for predicting modulation type by using classification target signal sampled with single sampling frequency

Disclosed are a variable antenna and an apparatus for detecting a radio signal. The variable antenna includes: a first receiving unit including at least one liquid metal antenna element; a second receiving unit including at least one liquid metal antenna element having a length different from a length of the first receiving unit; and a gain control unit configured to electrically adjust lengths of the liquid metal antenna elements for one of the first receiving unit and the second receiving unit according to the frequency of a received signal, wherein each antenna array realized by the liquid metal antenna elements of the first receiving unit and the second receiving unit is arranged in a single bay.

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Daejeon, South Korea

Gwang Moon Park