Abstract: This application discloses a ranging method, apparatus, and system, to improve precision of positioning/ranging/angle measurement/sensing performed by a device on a target. A first device sends a first ranging signal and/or receives a second ranging signal over at least one first channel, and a second device receives the first ranging signal and/or sends the second ranging signal over the at least one first channel. The first device and the second device perform frequency hopping for at least one time based on a frequency hopping parameter. The first device sends a third ranging signal and/or receives a fourth ranging signal over at least one second channel, and the second device receives the third ranging signal and/or sends the fourth ranging signal over the at least one second channel.

Abstract: The embodiments of the application disclose a ranging method including: sending a first ranging frame on a first channel, where the first ranging frame carries first ranging information through at least one first symbol; receiving a second ranging frame from a second node on the first channel, where the second ranging frame carries second ranging information through at least one second symbol; receiving first channel state information that is from the second node and corresponds to the first channel; determining second channel state information corresponding to the first channel based on the at least one second symbol; and determining channel state information corresponding to the first channel based on the first channel state information and the second channel state information, where the channel state information corresponding to the first channel is used to measure a distance between a sender of the first ranging frame and the second node.

Abstract: A homogenization apparatus for pepper raw materials, including a base, and an annular storage tank and a stirring barrel fixed to the base. The stirring barrel is positioned under the storage tank, the bottom center of the stirring barrel is fixedly connected to a stationary shaft, the stirring barrel is rotationally drivable to rotate together with the stationary shaft about the axis of the stationary shaft, the stationary shaft extends upward into the storage tank, a sleeve is provided on an outer side of the stationary shaft, the sleeve is rotatably connected to the stationary shaft, so that the stirring barrel rotates relative to the storage tank; a portion of the sleeve accommodated in the stirring barrel is fixedly connected with a stirring part, an upper end of the stationary shaft is fixedly connected with a connecting plate.

Abstract: This application discloses a ranging method and a related apparatus, including: A first device sends a first measurement frame to a second device on a first frequency, and receives, on the first frequency, a second measurement frame sent by the second device; the first device sends a third measurement frame to the second device on a second frequency, and receives, on the second frequency, a fourth measurement frame sent by the second device, where the second frequency is different from the first frequency; and the first device obtains a first measurement result based on the second measurement frame; the first device obtains a third measurement result based on the fourth measurement frame; and the first device sends the first measurement result and the third measurement result to a third device.

Abstract: A method and apparatus for measuring an angle of arrival. The method includes: determining L×N values based on received values obtained by a first antenna array and a second antenna array by receiving a signal and determining an angle of arrival (AoA) of the first signal based on the L×N values. The first antenna array includes L rows of array elements arranged in a first direction and K columns of array elements arranged in a second direction. The second antenna array includes P rows of array elements arranged in the first direction and Q columns of array elements arranged in the second direction. N=K+Q. An included angle between the first direction and the second direction is greater than 0 degrees.

Abstract: Embodiments of this application provide a communication method and a communication apparatus. The communication method includes: A positioning module positions a target terminal device based on first information and/or second information, where the first information includes one or more of carrier phase measurement information of P second signals received by a first communication apparatus on N frequency resources, the second information includes one or more of carrier phase measurement information of M first signals received by a second communication apparatus on the N frequency resources, and N, M, and P are positive integers.

Abstract: A raw material mixing apparatus, including mixing drums and a feed pipe, each of the two mixing drums is provided with a feed port and a discharge port, the feed ports of the two mixing drums are both communicated with the feed pipe, and a switching valve is arranged on the feed pipe; a first rotating disc and a second rotating disc are rotatably connected at two ends of each said mixing drum respectively, and a stirring assembly is connected between the first rotating disc and the second rotating disc in the axial direction of each said mixing drum; the stirring assembly includes a central stirring element and a plurality of non-central stirring elements radially arranged between inner side walls of each said mixing drum and outer side walls of the central stirring element.

Abstract: A method includes: A first node scans another primary node based on a scanning parameter, where the first node is a primary node of at least one communication domain; and when the another primary node is not discovered through scanning, the first node listens to a first broadcast message based on random listening duration, where the first broadcast message is a broadcast message from one or more primary nodes in the another primary node, and the random listening duration is used by the first node to listen to the another primary node. The random listening duration is not fixed. Broadcast time periods of the first node and the another primary node are staggered, so that the first node can receive a broadcast message of the another primary node in the random listening duration.

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: A beamforming training method includes sending, by a first device, first indication information to a second device, where the first indication information instructs the second device to not perform an initiator sector sweep (ISS), sending, by the first device, a sector sweep frame of a responder sector sweep (RSS) to the second device, and receiving, by the first device, feedback information obtained by the second device during the RSS.

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 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 mechanical-model based earthquake-induced landslide hazard assessment method in earthquake-prone mountainous area includes: obtaining the cohesion and internal friction angle through a geological map of the study area and a geotechnical physical parameter; obtaining simulated ground motions by combining a pulse-like ground motion effect model and a pulse-like ground motion response model; calculating slope permanent displacement according to the simulated ground motions, the cohesion, the internal friction angle and other parameters; obtaining a statistical relationship between the permanent displacement and a landslide probability according to permanent displacement data derived from historical earthquake-induced landslides and historical strong earthquake records; and predicting earthquake-induced landslide probability according to the slope permanent displacement and the statistical relationship between the permanent displacement and the landslide probability, and quantitatively evaluating earthquake-ind

Abstract: A method and apparatus for measuring an angle of arrival. The method includes: determining L×N values based on received values obtained by a first antenna array and a second antenna array by receiving a signal and determining an angle of arrival (AoA) of the first signal based on the L×N values. The first antenna array includes L rows of array elements arranged in a first direction and K columns of array elements arranged in a second direction. The second antenna array includes P rows of array elements arranged in the first direction and Q columns of array elements arranged in the second direction. N=K+Q. An included angle between the first direction and the second direction is greater than 0 degrees.

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 training packet sending method and apparatus, where the method includes generating, by a first device, a training packet, where the training packet includes a preamble, a header, and a training field, and the header includes at least a legacy header, and repeatedly sending, by the first device, the preamble using N channels, sending the legacy header in the header using the N channels, and sending the training field to at least one second device using H channels of the N channels, where N is greater than 1, and H is greater than 1 and less than or equal to N.

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 sector level sweep method and apparatus are provided. A local end generates a first sector sweep packet at the local end sector sweep stage, and the local end sends the first sector sweep packet to a peer end by using a first beam. A quantity of bytes of the first sector sweep packet is not greater than 27, the first sector sweep packet includes beam indication information of the first beam, the beam indication information includes antenna identification information of the beam, and a maximum quantity of antennas indicated by the antenna identification information is at least 8.

Abstract: A beamforming training method includes sending, by a first device, first indication information to a second device, where the first indication information instructs the second device to not perform an initiator sector sweep (ISS), sending, by the first device, a sector sweep frame of a responder sector sweep (RSS) to the second device, and receiving, by the first device, feedback information obtained by the second device during the RSS.

Abstract: A homogenization apparatus for pepper raw materials, including a base, and an annular storage tank and a stirring barrel fixed to the base. The stirring barrel is positioned under the storage tank, the bottom center of the stirring barrel is fixedly connected to a stationary shaft, the stirring barrel is rotationally drivable to rotate together with the stationary shaft about the axis of the stationary shaft, the stationary shaft extends upward into the storage tank, a sleeve is provided on an outer side of the stationary shaft, the sleeve is rotatably connected to the stationary shaft, so that the stirring barrel rotates relative to the storage tank; a portion of the sleeve accommodated in the stirring barrel is fixedly connected with a stirring part, an upper end of the stationary shaft is fixedly connected with a connecting plate.