12results about How to "Reduce multipath effects" patented technology

The invention provides a channel modeling method with a horizontal coupling distance and based on surface wave transmission. The channel modeling method comprises the following steps: step 1, setting a transmitting end, a receiving end and a metal tube; 2, carrying out initial measurement; step 3, calculating a path loss value according to the measurement data; 4, changing the distance between the transmitting end and the receiving end and repeating the step 3; 5, changing the height difference between the sending end and the receiving end, and repeating the steps 3-4; step 6, constructing a path loss model with receiving end horizontal coupling distance influence; step 7, obtaining a final path loss model; and step 8, inputting the distance d between the transmitting end and the receiving end and the horizontal coupling distance of the receiving end into the final path loss model to obtain a path loss value of a receiving-transmitting end channel under a corresponding condition. Compared with the prior art, the method is more convenient for guiding optimized layout of signal coverage and working nodes in an industrial Internet of Things environment.

The invention discloses a signal data real-time acquisition, storage and transmission device applied to a hydrophone, and the device comprises a plurality of sound wave receivers disposed on a measurement platform to form a matrix layout; receiving sound wave signals of different underwater paths, and performing electric signal conversion; analyzing the received sound wave signal, extracting signal data of the sound wave, and calculating the arrival angle of the sound wave signal; calculating the position of a target signal source, determining main signals in different paths, and correcting the main signals; the corrected signal data is transmitted to a storage device for segmented storage; according to the invention, the plurality of receivers are deployed on the measurement platform to form the matrix layout, and the position of the target signal source is calculated, so that the main signals received by the receivers are determined, the multipath effect caused by water body boundary reflection is eliminated, the main signals are corrected, the quality and accuracy of the signals are improved, and the measurement accuracy is improved. And accurate transmission and storage of underwater signals are ensured, so that the performance of the hydrophone system in a complex underwater environment is ensured.

The invention discloses a data acquisition method based on edge computing and satellite communication technologies, and relates to the technical field of communication data processing. The method comprises the following steps: constructing an edge cloud service platform by fusing cloud computing, edge computing and 5G communication technologies; optimizing a satellite communication protocol, a modulation and demodulation technology and a signal processing technology, and performing satellite communication data transmission; and intelligent data acquisition and processing are carried out. According to the invention, by fusing the high-performance calculation and storage capability of 5G edge cloud and the wide coverage advantage of satellite communication, more efficient, real-time and wide-coverage data acquisition is realized; the technical problems of high propagation delay, bandwidth limitation, expensive spectrum resources, path loss, multipath effect, Doppler frequency shift, orbit parameter uncertainty, edge computing resource limitation and the like encountered in data acquisition of the 5G edge cloud and satellite communication technology are effectively solved.

The invention discloses an ultra-short wave signal reconnaissance and direction finding positioning system and method based on an unmanned aerial vehicle in the technical field of radio signal reconnaissance and direction finding. The system comprises an unmanned aerial vehicle platform, a broadband direction-finding antenna array, a reconnaissance direction-finding load and a ground remote control terminal, wherein the broadband direction-finding antenna array and the reconnaissance direction-finding load are both arranged on the unmanned aerial vehicle platform; the broadband direction-finding antenna array comprises two independent broadband omnidirectional receiving antennas and outputs received signals to the reconnaissance direction-finding load; the reconnaissance direction-finding load comprises an acquisition preprocessing unit and a signal processing unit; the output end of the broadband direction-finding antenna array is connected with the acquisition preprocessing unit, and the acquisition preprocessing unit sends a preprocessing result to the signal processing unit; the ground remote control terminal comprises a load display control module and a flight control module; the load display control module is responsible for issuing a task instruction and receiving reconnaissance information uploaded by the reconnaissance direction-finding load at the same time. The method has the advantages of light weight, low power consumption and no need of regular calibration.

The application provides a positioning method and device of a terminal device and a storage medium. The method comprises the following steps: a first network element receives a reference signal; according to the reference signal, a time domain channel response of the reference signal is determined; the time domain channel response is filtered to obtain a direct path time domain signal; according to the direct path time domain signal, subcarrier phase information of the direct path frequency domain signal is determined, and the subcarrier phase information is used to determine position information of the terminal device. The application can improve the positioning accuracy of the terminal device.

The invention discloses a depth camera and a terminal. The recognition precision and the obstacle avoidance capability of low-reflection objects are improved. The depth camera comprises a transmitting assembly, a receiving assembly and a driving circuit, the transmitting assembly comprises a light source and a diffraction element, the light source comprises a first light source sub-array and a second light source sub-array, the first light source sub-array comprises a plurality of first point light sources arranged according to a first rule, and the second light source sub-array comprises a plurality of second point light sources arranged according to a second rule. The first sub light source array comprises a plurality of first point light sources arranged according to a first rule, the second sub light source array comprises a plurality of second point light sources arranged according to a second rule, the diffraction element comprises a first partition pattern and a second partition pattern, the first sub light source array emits light beams towards the first partition pattern to emit first dot matrix light, and the second sub light source array emits light beams towards the second partition pattern to emit second dot matrix light. The light spot density of the first dot matrix light is smaller than that of the second dot matrix light, the receiving assembly receives the first dot matrix light and the second dot matrix light which are reflected back and generates first depth information and second depth information according to the first dot matrix light and the second dot matrix light, and the driving circuit is electrically connected with the receiving assembly and the light source.

The utility model relates to a single-layer double-frequency GNSS antenna which comprises an antenna medium and a bottom layer metal structure, a high-frequency radiation metal patch is arranged at the center position of the upper surface of the antenna medium, a low-frequency radiation metal patch is arranged on the upper surface of the antenna medium, fan-shaped metal radiation patches are arranged at the four corners of the antenna medium, and the fan-shaped metal radiation patches are arranged on the bottom layer metal structure. An arc-shaped isolation seam is arranged between the fan-shaped metal radiation patch and the low-frequency radiation metal patch; metal through hole structures are arranged on the high-frequency radiation metal patch, the low-frequency radiation metal patch and the fan-shaped metal radiation patch, and feeding points are arranged on the high-frequency radiation metal patch and the low-frequency radiation metal patch. The utility model belongs to the technical field of antennas, a high-frequency radiation metal patch and a low-frequency radiation metal patch are arranged on an antenna medium and are isolated through a non-metal gap, a double-frequency function is obtained, the size of the antenna is effectively reduced, complexity of a traditional multi-layer structure is avoided through a single-layer integrated design, and miniaturization application is facilitated.

The present application provides a method for determining a calibration network in a multi-channel SAR without delay. Calibration is performed through a calibration network in a multi-channel SAR without delay. The transmitting branch is connected to the power amplifiers of multiple driver amplifiers, and the limiter of a driver amplifier is connected to one end of a single-pole double-throw switch of a receiving branch. The circulator of each driver amplifier is connected to the first feeding network through a transceiver channel. The coupler of the transmitting branch is connected to the third single-pole double-throw switch of the calibration module. The phased array antenna module is connected to the first single-pole double-throw switch of the calibration module through a combiner. The calibration module is connected to the power divider through a single-pole single-throw switch. The power divider is connected to the other end of the single-pole double-throw switch in each receiving branch. The receiving branch is connected to the integrated digital unit. The integrated digital unit is connected to the transmitting branch. The calibration network and method provided in the present application can improve the gain stability when performing non-delay calibration.

The invention provides a spectrum inversion high-resolution processing method based on strong axis stripping, and relates to the field of seismic exploration, and the technical scheme is that the spectrum inversion high-resolution processing method based on strong axis stripping is characterized by comprising the following steps: inputting original seismic data, and extracting strong reflection wave event seismic data; subtracting the extracted strong reflection wave event seismic data from the original seismic data to obtain seismic data after strong reflection suppression; replacing the original seismic data with the seismic data subjected to strong reflection suppression, and establishing a spectrum inversion objective function; and solving the spectral inversion objective function to obtain a high-resolution seismic section which suppresses strong reflected waves and highlights weak signals. The method has the advantages that a spectral inversion high-resolution processing mechanism based on strong axis stripping is clear, and time domain iteration deconvolution stripping of the strong reflection wave event, spectral inversion high-resolution processing stripping of the strong reflection wave event, strong reflection suppression and spectral inversion high-resolution thin layer recognition are involved.

The invention relates to the technical field of perception, and discloses a life body perception method and device, and the method comprises the steps: collecting a first perception signal corresponding to at least one perception path in a preset time period; for each first sensing signal, according to the first sensing signal, calculating a multi-dimensional environment characteristic value of a sensing path corresponding to the first sensing signal, the multi-dimensional environment characteristic value being used for representing a multi-dimensional environment change condition of the sensing path in a preset time period; determining at least one second sensing signal in all the first sensing signals according to all the multi-dimensional environment characteristic values; all the second sensing signals are input into a preset life body sensing model, life body sensing information of the sensing path corresponding to each second sensing signal is obtained, and the life body sensing information at least comprises life body type information and / or life body position information. Therefore, by implementing the method, the accuracy and comprehensiveness of life perception can be improved.

The present invention provides a method for message error control and platform motion compensation based on an air-based navigation source, and belongs to the field of aerospace engineering and control system technology. The method comprises the following steps: first, calculating the message parameters of the planned track; then, calculating the planned motion parameters of the platform based on the message parameters, and obtaining the current actual motion parameters through the airborne motion sensor; then, comparing the planned motion parameters with the actual motion parameters, and calculating the motion compensation amount; finally, inputting the motion compensation amount into the motion control system, and generating the corresponding control law in real time to compensate for the navigation message error. The method improves the autonomy and stability of the platform, effectively reduces the influence of external factors on navigation accuracy, enhances the platform's adaptability to complex environments, and improves the robustness of the system under various complex environments and conditions.

The invention provides a method for determining a calibration network in a multi-channel SAR (Synthetic Aperture Radar) non-delay, calibration is performed through the calibration network in the multi-channel SAR non-delay, a transmitting branch is connected with power amplifiers of a plurality of driving amplifiers, and an amplitude limiter of one driving amplifier is connected with one end of a single-pole double-throw switch of one receiving branch. The circulator of each driving amplifier is connected with the first feed network through a transmit-receive channel. And the coupler of the transmitting branch is connected with the third single-pole double-throw switch of the calibration module. The phased-array antenna module is connected with the first single-pole double-throw switch of the calibration module through the combiner. The calibration module is connected with the power divider through the single-pole single-throw switch. And the power divider is connected with the other end of the single-pole double-throw switch in each receiving branch. And the receiving branch is connected with the comprehensive digital unit. And the integrated digital unit is connected with the transmitting branch. According to the calibration network and method provided by the invention, the gain stability during non-delay calibration can be improved.