Radar apparatus and signal processing method therein

A radar apparatus, comprising:

• a transmit circuit configured to generate a RF transmit signal based on a local oscillation signal and comprising a transmit antenna radiating a transmit electromagnetic signal corresponding to the RF transmit signal;
• a receive circuit configured to detect, through a plurality of antennas, receive electromagnetic signals that the transmit electromagnetic signal was reflected by a target and propagated toward the radar apparatus and amplify detected signals to acquire n-tuple RF receive signals (where n is a natural number greater than or equal to 2);
• a frequency downconverter configured to convert each of the RF receive signals into an in-phase (I)-channel IF signal and a quadrature (Q)-channel IF signal such that frequency bands of 2n IF signals for the RF receive signals are sequentially displaced by a predetermined offset frequency;
• an analog-to-digital converter configured to perform an analog-to-digital conversion of a single IF signal into which the 2n IF signals are combined to generate a single digital signal stream;
• and
• a digital signal processor configured to processes the digital signal stream to extract target information.