Abstract: Signal transmission methods, signal processing methods, apparatuses such as antenna arrays and transmitters, and a radar system are disclosed. One example transmitter comprises a monolithic microwave integrated circuit (MMIC); and a plurality of transmit antennas. The plurality of transmit antennas are configured to send radar signals. The radar signals include multiple rounds of chirp signals. The plurality of transmit antennas send chirp signals in a time division multiplexing (TDM) manner. The plurality of transmit antennas include a first transmit antenna. Each round of chirp signals include signals in a minimum fixed period. The first transmit antenna is configured to send more than one chirp signal in the minimum fixed period.

Abstract: A radar signal transmitting method, a radar signal receiving method, and an apparatus applied to a radar apparatus are provided. The radar signal transmitting method includes: sending a first signal and a second signal in S slots, wherein a phase of the first signal remains unchanged in the S slots, and the first signal may be equivalent to a SIMO signal; and sending the second signal in at least one of a time division manner or a code division manner, wherein phase modulation is performed, by using a step of 2?ky/P, on a signal that is in the second signal and that is sent through each of m transmit antennas, and the second signal is equivalent to a MIMO signal. When P=2, the MIMO signal is sent in a time division manner. When P>2, the MIMO signal is sent in a time division manner and a code division manner.

Abstract: The disclosure provides signal transmission methods, signal processing methods, apparatuses, and a radar system. One example signal transmission method is applied to a multiple input multiple output (MIMO) radar. A transmitter in the MIMO radar sends a measurement frame used to measure a velocity of a target. The measurement frame includes a first burst. In the first burst, each low-density transmit antenna sends one chirp signal in each timeslot, and at least one high-density transmit antenna sends more chirp signals in additional timeslots.

Abstract: A radar signal transmitting method, a radar signal receiving method, and an apparatus applied to a radar apparatus are provided. The radar signal transmitting method includes: sending a first signal and a second signal in S slots, wherein a phase of the first signal remains unchanged in the S slots, and the first signal may be equivalent to a SIMO signal; and sending the second signal in at least one of a time division manner or a code division manner, wherein phase modulation is performed, by using a step of 2?ky/P, on a signal that is in the second signal and that is sent through each of m transmit antennas, and the second signal is equivalent to a MIMO signal. When P=2, the MIMO signal is sent in a time division manner. When P>2, the MIMO signal is sent in a time division manner and a code division manner.

Abstract: A radar system includes a transmitter configured to transmit a radar signal, and a receiver configured to receive an echo signal obtained after the radar signal is reflected by a target, where a transmit antenna array of the transmitter and a receive antenna array of the receiver are used to form a virtual linear array and a virtual planar array, the virtual linear array includes a uniform linear array in a first direction, the virtual planar array includes a uniform planar array, and a first spacing between two adjacent array elements in the uniform linear array is less than a second spacing between two adjacent array elements in the first direction in the uniform planar array.

Abstract: A velocity ambiguity resolving method and an echo signal processing apparatus are provided. The method includes: calculating, for first echo signals respectively received by at least two receive antennas in the N receive antennas, a first estimate of a direction of arrival formed by the at least two receive antennas and a first target, where the first echo signals are echo signals formed after transmit signals sent by a same transmit antenna in a time division transmit mode are reflected by the first target; separately performing, by using the first estimate, angle compensation on M second echo signals received by a first receive antenna, to obtain M first compensated echo signals; and performing velocity estimation based on at least two first compensated echo signals, to obtain a velocity of the first target.

Abstract: A velocity measurement signal transmission and receiving method for an intelligent driving system includes generating a plurality of chirp signals for measuring moving velocities of one or more moving targets (301); and transmitting the plurality of chirp signals in a time-division multiplexing (TDM) repetition cycle by using M antennas (302), where the TDM repetition cycle includes one single-antenna transmit mode sub-cycle and L consecutive multi-antenna transmit mode sub-cycles.

Abstract: A radar system includes a transmitter configured to transmit a radar signal; and a receiver configured to receive an echo signal obtained after the radar signal is reflected by a target, where a transmit antenna array of the transmitter and a receive antenna array of the receiver are used to form a virtual linear array and a virtual planar array, the virtual linear array includes a uniform linear array in a first direction, the virtual planar array includes a uniform planar array, and a first spacing between two adjacent array elements in the uniform linear array is less than a second spacing between two adjacent array elements in the first direction in the uniform planar array.

Abstract: This disclosure provides a signal processing method and apparatus. The method includes: obtaining Nr1×M1 signals, where the Nr1×M1 signals are echo signals of M1 signals that are sent by a radar to a target in a SIMO mode; obtaining Nt×Nr2×M2 signals, where the Nt×Nr2×M2 signals are echo signals of M2 signals that are sent by the radar to the target in a MIMO mode; performing first signal processing on the Nr1×M1 signals to obtain first processing data, where the first signal processing includes sequentially performing range FFT analysis, linear prediction, and Doppler FFT analysis; performing second signal processing on the Nt×Nr2×M2 signals to obtain second processing data, where the second signal processing includes range FFT analysis and Doppler FFT analysis; and performing velocity matching ambiguity resolution processing based on the first processing data and the second processing data.

Abstract: A signal transmission method applied to a multiple-input multiple-output (MIMO) radar, the MIMO radar includes a transmitter, and the transmitter includes a plurality of transmit antennas. The signal transmission method includes sending, by the transmitter, a first burst in a first measurement frame, where the first measurement frame is used to measure a velocity of a target, and when the first burst is sent, each of the plurality of transmit antennas sends a chirp signal in a time division manner, and sending, by the transmitter, a second burst in the first measurement frame after the transmitter sends the first burst in the first measurement frame, where when the second burst is sent, a quantity of transmit antennas configured to send a chirp signal is one.

Abstract: This application provides a gap waveguide antenna structure and an electronic device, and relates to the field of communication radars. The antenna structure includes a top layer, a gap waveguide structure, a microstrip structure, and a bottom layer. The top layer is parallel to the bottom layer. A first metal layer and a second metal layer are laid on two sides of a dielectric layer of the top layer, and the microstrip structure is disposed on the second metal layer. A frame of the microstrip structure is separated from metal of the second metal layer by leaving a space. The foregoing special antenna structure can reduce a transmission loss, improve a coupling capability, and effectively improve transmission efficiency of energy or an electromagnetic wave.

Abstract: A target detection method and apparatus, a radar, and a vehicle are provided, and relate to the field of radar technologies. The method includes: obtaining a signal spectrum based on a received signal of a receive antenna of the radar; reconstructing a received signal corresponding to a target that is in the signal spectrum and that is greater than or equal to a signal strength threshold; eliminating a reconstructed received signal in the signal spectrum to obtain an updated signal spectrum, where the updated signal spectrum represents a signal spectrum that does not include the target; determining, in the updated signal spectrum, a parameter of a target that is greater than or equal to the signal strength threshold; and obtaining at least one of location information or speed information of the determined target based on the determined parameter of the target.

Abstract: This disclosure provides a signal processing method and apparatus. The method includes: obtaining Nr1×M1 signals, where the Nr1×M1 signals are echo signals of M1 signals that are sent by a radar to a target in a SIMO mode; obtaining Nt×Nr2×M2 signals, where the Nt×Nr2×M2 signals are echo signals of M2 signals that are sent by the radar to the target in a MIMO mode; performing first signal processing on the Nr1×M1 signals to obtain first processing data, where the first signal processing includes sequentially performing range FFT analysis, linear prediction, and Doppler FFT analysis; performing second signal processing on the Nt×Nr2×M2 signals to obtain second processing data, where the second signal processing includes range FFT analysis and Doppler FFT analysis; and performing velocity matching ambiguity resolution processing based on the first processing data and the second processing data.

Abstract: This application provides a gap waveguide antenna structure and an electronic device, and relates to the field of communication radars. The antenna structure includes a top layer, a gap waveguide structure, a microstrip structure, and a bottom layer. The top layer is parallel to the bottom layer. A first metal layer and a second metal layer are laid on two sides of a dielectric layer of the top layer, and the microstrip structure is disposed on the second metal layer. A frame of the microstrip structure is separated from metal of the second metal layer by leaving a space. The foregoing special antenna structure can reduce a transmission loss, improve a coupling capability, and effectively improve transmission efficiency of energy or an electromagnetic wave.

Abstract: A radar signal transmitting method, a radar signal receiving method, and an apparatus are applied to a radar apparatus. The radar signal transmitting method includes: sending a first signal and a second signal in S slots, where a phase of the first signal remains unchanged in the S slots, and the first signal may be equivalent to a SIMO signal; and sending the second signal in at least one of a time division manner or a code division manner, where phase modulation is performed, by using a step of 2?ky/P, on a signal that is in the second signal and that is sent through each of m transmit antennas, and the second signal is equivalent to a MIMO signal. When P=2, the MIMO signal is sent in a time division manner. When P>2, the MIMO signal is sent in a time division manner and a code division manner.

Abstract: A velocity ambiguity resolving method and an echo signal processing apparatus are provided. The method includes: calculating, for first echo signals respectively received by at least two receive antennas in the N receive antennas, a first estimate of a direction of arrival formed by the at least two receive antennas and a first target, where the first echo signals are echo signals formed after transmit signals sent by a same transmit antenna in a time division transmit mode are reflected by the first target; separately performing, by using the first estimate, angle compensation on M second echo signals received by a first receive antenna, to obtain M first compensated echo signals; and performing velocity estimation based on at least two first compensated echo signals, to obtain a velocity of the first target.

Abstract: A velocity measurement signal transmission and receiving method for an intelligent driving system includes generating a plurality of chirp signals for measuring moving velocities of one or more moving targets (301); and transmitting the plurality of chirp signals in a time-division multiplexing (TDM) repetition cycle by using M antennas (302), where the TDM repetition cycle includes one single-antenna transmit mode sub-cycle and L consecutive multi-antenna transmit mode sub-cycles.

Abstract: A signal transmission method and apparatus, a signal processing method and apparatus, and a radar system are provided. The signal transmission method is applied to a multiple input multiple output MIMO radar, the MIMO radar includes a transmitter, and the transmitter includes a plurality of transmit antennas. The signal transmission method includes: sending, by the transmitter, a first burst in a first measurement frame, where the first measurement frame is used to measure a velocity of a target, and when the first burst is sent, each of the plurality of transmit antennas sends a chirp signal in a time division manner; and sending, by the transmitter, a second burst in the first measurement frame after the transmitter sends the first burst in the first measurement frame, where when the second burst is sent, a quantity of transmit antennas configured to send a chirp signal is one.

Abstract: A signal transmission method and apparatus, a signal processing method and apparatus, and a radar system are provided, so that a MIMO radar can accurately resume a velocity measurement of a target to a velocity measurement range of a SIMO radar. The signal transmission method is applied to a multiple input multiple output (MIMO) radar. A transmitter in the MIMO radar sends a measurement frame used to measure a velocity of a target. The measurement frame includes a first burst. In the first burst, each low-density transmit antenna sends one chirp signal in each timeslot, and at least one high-density transmit antenna sends more chirp signals in additional timeslots.

Abstract: A radar system (400) and a vehicle are provided, so that when high angular resolution is obtained, a quantity of transmit antennas and a quantity of receive antennas are reduced, to reduce design and processing difficulty. The radar system (400) includes: a transmitter (401), configured to transmit a radar signal; and a receiver (402), configured to receive an echo signal obtained after the radar signal is reflected by a target, where a transmit antenna array of the transmitter (401) and a receive antenna array of the receiver (402) are used to form a virtual linear array and a virtual planar array, the virtual linear array includes a uniform linear array in a first direction, the virtual planar array includes a uniform planar array, and a first spacing between two adjacent array elements in the uniform linear array is less than a second spacing between two adjacent array elements in the first direction in the uniform planar array.