A radar device is provided which is capable of highly accurate distance calculation by a simple method. The radar device includes: a transmission circuit which transmits radio waves; an adjustment circuit which adjusts transmission angles of the radio waves transmitted from the transmission circuit; a reception circuit which receives plural signals which are the radio waves transmitted, based on adjustment made by the adjustment circuit, from the transmission circuit and respectively reflected from an object; and a signal processing circuit which, by processing the received signals, calculates a distance to the object. The signal processing circuit includes a buffer which stores signal strength data on the signals received by the reception circuit, the received signals respectively corresponding to the transmission angles, and a correction circuit which performs correction processing on equidistance-based portions of the signal strength data on the received signals stored in the buffer.

A radar device is provided which is capable of highly accurate distance calculation by a simple method. The radar device includes: a transmission circuit which transmits radio waves; an adjustment circuit which adjusts transmission angles of the radio waves transmitted from the transmission circuit; a reception circuit which receives plural signals which are the radio waves transmitted, based on adjustment made by the adjustment circuit, from the transmission circuit and respectively reflected from an object; and a signal processing circuit which, by processing the received signals, calculates a distance to the object. The signal processing circuit includes a buffer which stores signal strength data on the signals received by the reception circuit, the received signals respectively corresponding to the transmission angles, and a correction circuit which performs correction processing on equidistance-based portions of the signal strength data on the received signals stored in the buffer.

Methods and systems for monitoring a health parameter in a person using a radar system are disclosed. A method involves performing stepped frequency scanning below the skin surface of a person using at least one transmit antenna and a two-dimensional array of receive antennas, the stepped frequency scanning being performed using frequency steps of a first step size, changing the first step size to a second different step size in response to a change in reflectivity of blood in a blood vessel of the person, performing stepped frequency scanning below the skin surface of the person using the second step size after the step size is changed from the first step size to the second step size, and outputting a signal that corresponds to a blood pressure level in the person in response to the stepped frequency scanning at the first step size and at the second step size.

Disclosed is a pulse radar apparatus including a clock generator generating a transmission clock signal, a reception clock signal, and a sensitivity adjustment interval signal, a transmitter radiating a transmission pulse based on the transmission clock signal, and a receiver receiving a first pulse and a second pulse, which are associated with the transmission pulse, with different sensitivities based on the reception clock signal and the sensitivity adjustment interval signal.

Disclosed is a pulse radar apparatus including a clock generator generating a transmission clock signal, a reception clock signal, and a sensitivity adjustment interval signal, a transmitter radiating a transmission pulse based on the transmission clock signal, and a receiver receiving a first pulse and a second pulse, which are associated with the transmission pulse, with different sensitivities based on the reception clock signal and the sensitivity adjustment interval signal.

A method for operating a stepped frequency radar system is disclosed. The method involves performing stepped frequency scanning across a frequency range using frequency steps of a step size, the stepped frequency scanning performed using at least one transmit antenna and a two-dimensional array of receive antennas, changing at least one of the step size and the frequency range, and performing stepped frequency scanning using the at least one transmit antenna and the two-dimensional array of receive antennas and using the changed at least one of the step size and the frequency range.

In one example, an apparatus for multimode radar comprises: a transmit circuit; a receive circuit; and a controller configured to: transmit a first signal using the transmit circuit; set a maximum input signal level at the receive circuit, wherein the maximum input signal level is set based on a minimum of the first distance range; and detect, using the receive circuit, the reflected first signal; transmit a second signal using the transmit circuit; set a minimum input signal level at the receive circuit, wherein the minimum input signal level is set based on a maximum of the second distance range; detect, using the receive circuit, the reflected second signal; and measure a distance from an object based on one of the reflected first signal or the reflected second signal.

In one example, an apparatus for multimode radar comprises: a transmit circuit; a receive circuit; and a controller configured to: transmit a first signal using the transmit circuit; set a maximum input signal level at the receive circuit, wherein the maximum input signal level is set based on a minimum of the first distance range; and detect, using the receive circuit, the reflected first signal; transmit a second signal using the transmit circuit; set a minimum input signal level at the receive circuit, wherein the minimum input signal level is set based on a maximum of the second distance range; detect, using the receive circuit, the reflected second signal; and measure a distance from an object based on one of the reflected first signal or the reflected second signal.

Disclosed is a method and apparatus which use a first automatic gain control unit to receive a first data signal, use a second automatic gain control unit to receive a reflected radar signal, and switches between using the first automatic gain control unit and using the second automatic gain control unit.

Disclosed is a method and apparatus which use a first automatic gain control unit to receive a first data signal, use a second automatic gain control unit to receive a reflected radar signal, and switches between using the first automatic gain control unit and using the second automatic gain control unit.