Patent ID: 9709657
Date: 2017-07-18
CPC Classifications: G01S

Claim:
1. A method of estimating a direction of a radio frequency (RF) signal, comprising: receiving an RF signal from at least one antenna; performing preliminary correction when the at least one antenna has no directional gain; generating an analog signal by performing a frequency shift on the RF signal or a signal on which the preliminary correction has been performed; converting the analog signal into a digital sample; and extracting a phase of the antenna from the digital sample, and estimating a direction of the RF signal based on the extracted phase, wherein performing the preliminary correction comprises, when the at least one antenna is an MIMO antenna array having no directional gain, shifting frequencies of received signals of respective antennas of the MIMO antenna array or converting phases of the received signals, and merging the shifted or converted signals of the antennas into a single signal.