Radar transceiver

A radar transceiver included in a radar system, the radar system including a modulated signal generator circuit, a plurality of transmitters, and a plurality of receivers, the modulated signal generator circuit generating a radar modulated signal having a predetermined frequency band or generating an original signal from which the modulated signal is multiplied or divided, the plurality of transmitters transmitting the modulated signal through a plurality of transmission antennas, and the plurality of receivers receiving reflected signals of radar waves reflected by a target and an obstacle through a plurality of reception antennas,

• the radar transceiver comprising:
• a plurality of noise cancellers, a number of the plurality of noise cancellers being equal to a number of the plurality of reception antennas, each of the plurality of noise cancellers including a phase shifter circuit, a variable gain amplifier, and a coupler circuit,
• the phase shifter circuit being configured to shift (i) a phase of the modulated signal, (ii) a phase of the original signal, or (iii) a phase of a signal generated by a noise cancellation signal generator circuit having a frequency corresponding to a frequency of the reflected signal which is reflected by the obstacle and received while each of the plurality of transmitters transmits the modulated signal,
• the variable gain amplifier being configured to amplify or attenuate a noise cancellation signal generated based on an output signal of the phase shifter circuit, and
• the coupler circuit being configured to output a coupled signal by coupling the noise cancellation signal from the variable gain amplifier with a received signal from each of the plurality of receivers,
• wherein:
• a number of the plurality of transmitters is equal to a number of the plurality of transmission antennas;
• a number of the plurality of receivers is equal to a number of the plurality of reception antennas;
• and
• a controller controls an amplitude of the noise cancellation signal via the variable gain amplifier and a phase shift amount of the noise cancellation signal via the phase shifter circuit to cancel the reflected signal reflected by the obstacle based on the coupled signal,
• the radar transceiver further comprising
• a storage, the controller being configured to store the amplitude and the phase shift amount of the noise cancellation signal as parameters to the storage.

A radar transceiver for a radar system comprising:

• a modulated signal generator circuit configured to generate a radar modulated signal having a predetermined frequency band or generate an original signal from which the modulated signal is multiplied or divided;
• a transmitter configured to transmit the modulated signal through a transmission antenna;
• a receiver configured to receive reflected signals of radar waves reflected by a target and an obstacle through a reception antenna;
• a noise canceller including a phase shifter circuit, a variable gain amplifier, and a coupler circuit;
• the phase shifter circuit being configured to shift (i) a phase of the modulated signal, (ii) a phase of the original signal, or (iii) a phase of a signal generated by a noise cancellation signal generator circuit having a frequency corresponding to a frequency of the reflected signal which is reflected by the obstacle and received while the transmitter transmits the modulated signal,
• the variable gain amplifier being configured to amplify or attenuate a noise cancellation signal generated based on an output signal of the phase shifter circuit, and
• the coupler circuit being configured to output a coupled signal by coupling the noise cancellation signal from the variable gain amplifier with a received signal from the receiver;
• and
• a storage configured to store an amplitude and a phase shift amount of the noise cancellation signal as parameters,
• wherein:
• the amplitude of the noise cancellation signal is controlled by a controller via the variable gain amplifier to cancel the reflected signal which is reflected by the obstacle based on the coupled signal;
• and
• the phase shift amount of the noise cancellation signal is controlled by a controller via the phase shifter circuit to cancel the reflected signal which is reflected by the obstacle based on the coupled signal.