A method includes: receiving a ranging signal from the transmitter including a set of multiplexed sub-signals, each multiplexed sub-signal characterized by a frequency in a set of frequencies; calculating a sample-based time-of-arrival estimate based on the series of time-domain samples of the ranging signal; calculating a sample-based uncertainty of the sample-based time-of-arrival; for each sub-signal pair in a subset of multiplexed sub-signals of the set of multiplexed sub-signals, extracting a phase difference of the sub-signal pair; calculating a phase-based time-of-arrival estimate based on the phase difference of each sub-signal pair in the subset of multiplexed sub-signals; calculating a phase-based uncertainty of the phase-based time-of-arrival estimate; and calculating a hybrid time-of-arrival estimate as a weighted combination of the sample-based time-of-arrival estimate, the phase-based time-of-arrival estimate, based on the sample-based uncertainty and the phase-based uncertainty.

A radar system processes signals in a flexible, adaptive manner to determine range, Doppler (velocity) and angle of objects in an environment. The radar system includes transmitters configured to transmit radio signals, receivers configured to receive radar signals, and a control unit. The received radio signals include transmitted radio signals transmitted by the transmitters and reflected from objects in an environment. The control unit adaptively controls the transmitters and the receivers based on a selected operating mode for the radar system. The selected operating mode meets a desired operational objective defined by current environmental conditions. The control unit is configured to control the receivers to produce and process data according to the selected operating mode.

The present disclosure relates to a hybrid multiple-input multiple-output (MIMO) radar concept. Via a first subset of a plurality of transmit channels and during a first time interval, first frequency-modulated continuous-wave (FMCW) radar signals are con-currently transmitted with different phase offsets among different transmit channels of the first subset in accordance with a first predefined code division multiplexing scheme. Via a second subset of the transmit channels and during a second time interval subsequent to the first time interval, second FMCW radar signals are concurrently transmitted with different phase offsets among different transmit channels of the second subset in accordance with a second predefined code division multiplexing scheme.

An apparatus and method for gesture detection and recognition. The apparatus includes a processing element, a radar sensor, a depth sensor, and an optical sensor. The radar sensor, the depth sensor, and the optical sensor are coupled to the processing element, and the radar sensor, the depth sensor, and the optical sensor are configured for short range gesture detection and recognition. The processing element is further configured to detect and recognize a hand gesture based on data acquired with the radar sensor, the depth sensor, and the optical sensor.

Apparatuses and methods for two-dimensional beam scanning for determining the position of an object in three-dimensional space are provided. An apparatus comprises a multiplicity of transmitters and receivers, which are arranged orthogonal to one another in an L-, U- or T-shaped structure. In one apparatus, the transmission signals are frequency and phase modulated in combination; and in another apparatus a single frequency carrier signal is subject to binary phase modulation. Here, this is a high-frequency encoding with a great code length, which is generated according to the pseudo-random number principle. The received signals, which include information from all transmitters, are decoded and consequently split into sub-signals, which can be assigned to a two-dimensional virtual array. According to the method of digital beamforming, the individual signals of the virtual antenna elements are formed into a plurality of highly focused beams in the horizontal and vertical direction.

An apparatus and method for radar based gesture detection. The apparatus includes a processing element and a transmitter configured to transmit radar signals. The transmitter is coupled to the processing element. The apparatus further includes a plurality of receivers configured to receive radar signal reflections, where the plurality of receivers is coupled to the processing element. The transmitter and plurality of receivers are configured for short range radar and the processing element is configured to detect a hand gesture based on the radar signal reflections received by the plurality of receivers.

A radar device is configured in such a manner that each of transmission radars uses, as the amount of phase modulation, a value determined from either one of a positive integer value that is less than or equal to a result of division obtained by dividing the number of hits of a transmission RF signal by the number of the transmission radars and a value of 0; a hit number h of the transmission RF signal; and the number of hits.

An orthogonal separation device of the invention includes a demodulator that performs a demodulation process corresponding to each of a plural number N of antennas for each of a plural number P (=MN) of pulse waves (R11 to R1M), . . . , (RN1 to RNM) which arrives at the plural number N of antennas by transmitting, at the same time, a plural number M of pulse waves having phases .sub.1 to .sub.M set as different arrays of known discrete values and that generates a plural number P of demodulated signals (R.sub.11 to (R.sub.1M), . . . (R.sub.N1 to R.sub.NM), and includes a phase adjuster that adjusts difference among the phases of a plural number P of demodulated signals (R.sub.11 to R.sub.1M), . . . , (R.sub.11 to R.sub.NM) according to the arrays of known discrete values and generates a plural number P of in-phase signals (r11 to r1M), . . . , (rN1 to rNM).

An automotive spread MIMO-configured radar system has a plurality of transceiver antenna units for transmitting mutually orthogonal radar waves. Each transceiver antenna unit has a plurality of range gates to indicate a range detected by the transceiver antenna unit. At least one specific transceiver antenna unit (TRx.sub.1) is configured to transmit a reference signal received directly by at least one transceiver antenna unit (TRx.sub.2) that is separated by an a priori known distance from the specific transceiver antenna unit (TRx.sub.1). An evaluation and control unit is configured for reading out the plurality of range gates for the transceiver antenna unit (TRx.sub.2), and, based on the read-out range gate that indicates the received reference signal and based on the a priori known distance, for synchronizing the specific transceiver antenna unit (TRx.sub.1) and the transceiver antenna unit (TRx.sub.2) that received the reference signal and/or for correcting a measured Doppler shift.

The present disclosure relates to a radar system and a transmission apparatus therefor, including a signal generator for generating a first signal; a phase adjuster configured to include a plurality of input ports and at least one output port, to generate a second signal by adjusting the phase of the first signal according to an input port through which the first signal is transmitted among the plurality of input ports, and to output the generated second signal to an antenna unit; and a port selector configured to select at least one of the plurality of input ports of the phase adjuster according to an identification code and to transmit the first signal through the selected input port so that a transmission signal radiated through the antenna unit is phase inverted or formed in a pattern corresponding to the identification code, so that interference by the other radar system can be minimized, and the accuracy, reliability and frequency efficiency of the radar system can be improved.