6 results about "Wave angle" patented technology

The invention discloses a self-adaptive rotating baseline direction finding method, device and equipment, a medium and a terminal. Signals are continuously collected through the base line rotatable antenna array; rapidly identifying and outputting environment parameters by using the trained environment evaluation model, and evaluating the environment grade; constructing a dynamic direction-finding angle model by combining the attitude parameters and the motion parameters of the mobile platform, the control parameters of the antenna array and the environmental parameters; according to the environment parameters and the environment grades, a dynamic parameter optimization rule is formulated, and control parameters, direction-finding resolving parameters and signal processing algorithm parameters of the antenna array are adjusted; and based on the environmental parameters, the adjusted control parameters of the antenna array, the adjusted direction-finding resolving parameters and the adjusted adaptive filter parameters, calculating an incoming wave angle by using a dynamic direction-finding angle model. According to the method, high-precision incoming wave signal direction finding is realized in a dynamic environment, and the method is suitable for mobile scenes such as unmanned aerial vehicles and vehicle-mounted communication.

This invention discloses a frequency domain hydrodynamic analysis method and system. The method includes establishing a detailed geometric model of a floating photovoltaic (PV) system; dividing the waterline according to the arrangement of the PV system; meshing the model to generate a grid system suitable for hydrodynamic analysis; setting analysis parameters based on model data, defining the physical properties of the PV modules, and configuring frequency domain analysis parameters to obtain the PV parameter setting results; using the grid system to perform frequency domain calculations on the PV parameter setting results under different arrangement conditions to obtain key hydrodynamic performance parameters, and analyzing the calculation results to obtain the hydrodynamic performance of the PV system under different wave angles; comparing and analyzing the hydrodynamic performance of the PV system under different wave angles, identifying the optimal and worst performance arrangement schemes, and optimizing the PV arrangement based on the analysis results. This invention effectively analyzes the frequency domain hydrodynamic performance characteristics of floating PV systems under different wave angles.

The invention discloses a satellite-borne laser water depth correction and extraction method considering sea surface waves, and the method comprises the following steps: carrying out the sea surface wave fitting of satellite-borne laser sea surface photon points through employing a smooth spline function, and obtaining the instantaneous wave slope and elevation value of each sea surface photon position; modeling the incident line of each photon point according to the fitting result, and matching the seabed photon points with the sea surface photon points based on the modeling line of the incident light to calculate an initial water depth value; carrying out refraction correction on the initial water depth value according to a wave angle and a photon incidence angle of a sea surface wave fitting result of a corresponding position in combination with marine environment characteristics; and performing geophysical correction on a result after refraction correction to obtain a water depth extraction result based on the average sea level. Through water depth correction considering the sea surface wave angle and the wave height, sounding errors caused by sea surface waves are effectively compensated, and the satellite-borne laser water depth extraction precision and reliability are remarkably improved.

The invention discloses a millimeter wave angle extraction and laser link aiming method based on layered channel estimation, and relates to the field of laser communication. The objective of the invention is to solve the problem of low laser aiming accuracy and efficiency caused by low millimeter wave angle extraction efficiency and accuracy in the existing radio frequency assisted laser communication method. The method comprises the following steps: acquiring an equivalent received signal model of a carrier; constructing a channel model and a beam domain dictionary, and applying the beam domain dictionary to the channel model to obtain a vectorized channel model applying the beam domain dictionary; vectorizing the equivalent received signal model of the carrier to obtain a vectorized observation signal model; obtaining a candidate angle domain by adopting an M-layer codebook step-by-step scanning strategy, and obtaining a beam emission angle estimated value and a beam arrival angle estimated value based on the candidate angle domain; and according to the measurement precision of the beam emission angle estimation value and the beam arrival angle estimation value, obtaining the laser link pointing uncertainty area. The method is used for laser angle estimation and link aiming.

The present application relates to the technical field of millimeter wave radar, in particular to a kind of automatic calibration method of installation angle;It is suitable for the installation angle of vehicle-mounted millimeter wave angle radar is automatically calibrated;Collect the radar data of vehicle-mounted millimeter wave angle radar, obtain the standard point cloud data of each frame radar data and store in point cloud data group;When the standard point cloud data stored in the point cloud data group reaches the preset frame number, the installation angle error of the vehicle-mounted millimeter wave angle radar is obtained by processing the point cloud data group;According to the installation angle error obtained by processing multiple times, the installation angle error wave gate is obtained, and the installation angle of the vehicle-mounted millimeter wave angle radar is automatically calibrated according to the installation angle error wave gate;Advantages: real-time calibration during vehicle driving process;Angle error range can be dynamically adjusted, so that the calibration value converges;It can be judged that the position of radar may have been shifted, and large-scale shift caused by collision and jolt can be calibrated.

The invention discloses a method for calculating a space time delay compensation value of an antenna array, and the method comprises the steps: obtaining a coordinate of a virtual far-field target according to a far-field condition satisfied by a real space target, and an azimuth angle and a pitch angle of the real space target; according to the coordinate information of each antenna in the antenna array and the coordinate information of the virtual far-field target, obtaining an equivalent wave path difference of each antenna in the antenna array to the real space target; and according to the equivalent wave path difference of each antenna in the antenna array for the real space target, obtaining a space time delay compensation value required by signal synthesis of each antenna in the antenna array. The method does not need to calculate the incoming wave angle of each antenna in the antenna array to the space target, and can calculate the signal space time delay compensation value when the antenna array carries out array signal synthesis under the condition that the precise distance between the space target and the antenna is not needed.