104 results about "Azimuth direction" patented technology

The invention belongs to the technical field of image processing, and discloses a three-dimensional radar sub-aperture imaging deformation monitoring device and method, and the device comprises a radar which is used for collecting echo signals passing through a preset position, processing the echo signals according to frequency mixing and analog-to-digital conversion, obtaining a three-dimensional echo matrix, and outputting the three-dimensional echo matrix; the three-dimensional echo matrix and a sampling ending signal are sent to a motion compensation module; the motion compensation module is used for resampling the azimuth direction of the three-dimensional echo matrix by adopting an interpolation algorithm; the distance matching filtering module is used for performing pulse compression on the distance direction of the three-dimensional echo matrix; the migration correction module is used for carrying out migration correction on the distance direction of the three-dimensional echo matrix after pulse compression; the sub-aperture imaging module is used for calculating a three-dimensional echo matrix after migration correction according to a sub-aperture imaging algorithm; and the deformation monitoring module is used for performing interference difference processing on the three-dimensional complex image to obtain deformation data. The imaging quality and the deformation monitoring precision can be improved.

The invention discloses a high-resolution SAR deception jamming signal rapid generation method and device, and belongs to the technical field of radar countermeasure. The method comprises the following steps: intercepting an SAR signal and measuring parameters of the SAR signal; obtaining a deception jamming template image, and carrying out edge optimization processing; performing two-dimensional partitioning on the template in the distance direction and the azimuth direction to obtain a plurality of sub-templates; calculating a phase compensation function for the central point of each sub-template, and carrying out phase optimization; the optimized sub-templates are superposed, and a high-quality product modulation matrix is generated; and multiplying the matrix by an intercepted SAR signal, and transmitting after digital-to-analog conversion and up-conversion to form a deception jamming signal. According to the method, through block phase compensation and template edge optimization, the imaging quality and concealment of the deception jamming image under the high-resolution SAR are remarkably improved, meanwhile, low calculation complexity is kept, and the method is suitable for satellite-borne and airborne SAR systems.

The invention discloses a method for realizing elliptic cone scanning by a communication-in-moving antenna. The method comprises the following steps: determining the value of a scanning position point number parameter N; determining the value of the maximum scanning offset angle delta A in the azimuth angle direction and the value of the maximum scanning offset angle delta E in the pitch angle direction; determining values of an expected azimuth angle alpha 0 and an expected pitch angle beta 0 of the current antenna; setting a scanning counter i; when i is less than 4N, calculating a parameter theta i, calculating a scanning offset angle delta i, calculating a scanning track beta i of a pitch angle, and calculating a scanning track alpha i of an azimuth angle; the pitch angle of the antenna is controlled to rotate to a new position beta i, and the azimuth angle of the antenna is controlled to rotate to a new position alpha i; and updating the scanning counter i, i = mod (i + 1, 4N), and returning to execute. The method not only can realize elliptic cone scanning, but also can realize cone scanning, and can effectively solve the problem that the average receiving level is reduced when the communication-in-moving antenna of which the cross section of the beam main lobe is elliptic performs cone scanning.

The invention provides a method for obtaining a three-dimensional body through two-dimensional seismic reflection data gridding, and belongs to the field of seismic data processing. Through a technical means of constructing a virtual grid through rotation, a two-dimensional measuring line is converted into a three-dimensional data body which is uniformly distributed in space, and subsequent data processing is not limited to one direction any more. Specifically, latitude and longitude coordinates of each discrete reflection data are obtained and converted into UTM projection rectangular coordinate values, and coordinate values of a longitude minimum point are determined; calculating the optimal azimuth angle of the grid according to the plane distribution characteristics of the discrete points, and determining the grid spacing along the azimuth angle direction and the vertical azimuth angle direction; the grid is rotated to the three-dimensional grid direction, the coordinates of the point with the minimum longitude value after rotation are extended outwards by a half grid interval, and the coordinates of the point serve as base points of the grid; all the coordinate points are rotated in the same way, data falling into the same grid are superposed, then the coordinate number of each point in the grid is calculated, and a three-dimensional data volume is obtained accordingly.

The application provides a master-slave type star cluster cooperative SAR-GMTI system and method, which comprises: an azimuth multi-channel master star M1, a small satellite cluster M2 along a heading direction, and an on-board joint processing module M3; the azimuth multi-channel master star M1 is used for transmitting radar signals in a full array and receiving radar signals in an azimuth direction; the small satellite cluster M2 along the heading direction is composed of at least two small satellites in a receiving mode only, and the small satellite cluster is linearly distributed along the heading direction; and the on-board joint processing module M3 is used for fusing SAR image data of the azimuth multi-channel master star M1 and the small satellite cluster M2 along the heading direction, and completing target detection and relocation through space-time adaptive processing. The application effectively solves problems such as a large minimum detectable speed of a single platform system and speed ambiguity of a distributed system, and provides important technical support for subsequent spaceborne SAR earth imaging observation.

An acoustic window including a convex surface that extends in an azimuth direction and contacts an examination target, and a first wall portion and a second wall portion that extend divergently from each other. At least a portion of the first wall portion is provided along an inner surface of the probe case, and the second wall portion has an outer surface that is contiguous with the convex surface.

The application discloses a vortex electromagnetic wave radar forward-looking imaging method and system based on a concentric circular array design, a storage medium and an electronic device, and specifically comprises the following steps: establishing a new system radar imaging model according to a radar working mode; designing a concentric circular array and a vortex mode transmitting function; deriving a return model; obtaining distance direction high-resolution information of a target; performing distance correction, phase decoupling and Bessel amplitude compensation on the azimuth direction of the return, and coherently superimposing the compensated return to reestablish a dual relationship between a mode and an azimuth angle; and finally, realizing vortex electromagnetic wave radar forward-looking two-dimensional imaging through fast Fourier transform on the azimuth direction. The forward-looking imaging can increase the observation time of a region of interest, keep the region of interest in a main lobe range, enhance the strength of a return, increase return information, and effectively improve the azimuth direction resolution.

The application discloses a cross-water bridge parameter inversion method and system based on generalized compact polarization SAR total power intensity peak value, and belongs to the technical field of synthetic aperture radar remote sensing, and solves the problems of low system efficiency, non-movable discriminator, non-uniform GCP mode discriminators and precision affected by pixel deviation of the prior art. The application obtains or synthesizes a received scattering vector; total power is calculated pixel by pixel based on the received scattering vector, a filter is used for multi-view processing, a smoothed total power map is obtained, the smoothed total power profile in the distance direction is obtained by averaging in the azimuth direction within the azimuth direction interval covered by the determined bridge main span, three local maximum peak values satisfying preset conditions are identified by using a peak value detection method; and the geometric parameters of the bridge are inverted based on the pixel positions of the local maximum peak values and combined with imaging geometric parameter inversion. The application is used for the safety monitoring and quantitative inversion of geometric parameters of cross-sea and cross-river bridge infrastructure.

A satellite (140) for operation in an orbit around the Earth includes an ADCS (131, Fig. 1) configured to mechanically steer the satellite in an azimuth direction to extend a dwell time (1105) during which a target is visible from the satellite when the satellite is orbiting above the target of choice. A processor at a ground station can be configured to process raw SAR data from any of the satellites described herein. The raw SAR data can be processed in a variety of ways to provide image information, including but not limited to forming multi-view images, compiling video sequences, and color coding images.

Provided is a dimming device having small azimuthal dependence of transmittance of light emitted in an oblique direction. The present invention includes a first liquid crystal optical element and a second liquid crystal optical element which each contain a liquid crystal material and a guest material and which can change the orientation direction of the guest material by application of a voltage. When the voltage is applied, an angle formed by the azimuth direction in which the guest material in the first liquid crystal optical element is inclined and the azimuth direction in which the guest material in the second liquid crystal optical element is inclined is 170-190°. Between the first liquid crystal optical element and the second liquid crystal optical element, at least two phase-retardation layers A and at least one phase-retardation layer C are included, in which at least a phase-retardation layer A, a phase-retardation layer C, and a phase-retardation layer A are arranged in the stated order. The phrase-retardation layers A satisfy nxA>nzA≥nyA, and the phase-retardation layer C satisfies nzC>nxC≥nyC.

The invention provides a moving target detection method which can be applied to the technical field of radar signal processing and artificial intelligence. The method comprises the following steps: carrying out sub-aperture segmentation on full-aperture spaceborne synthetic aperture radar echo data in an azimuth direction to obtain multiple pieces of sub-aperture data; performing distance compression, phase compensation and backward projection imaging processing on each piece of sub-aperture data to generate a sub-aperture image sequence; processing the sub-aperture image sequence by using a pre-trained deep learning semantic segmentation model to obtain a pixel-level segmentation mask of the moving target; and inverting the peak position of the moving target in the echo signal after distance compression based on the pixel-level segmentation mask. The invention also provides a moving target detection device, equipment and a medium.

The application relates to a low-sidelobe transmitting and receiving beam forming method based on a cylindrical array, which is used for solving the problem of high sidelobe level of the existing cylindrical phased array radar. The application utilizes the cylindrical array to decouple the cylindrical array into a uniform linear array in the elevation direction and a uniform circular array or a circular arc array in the azimuth direction at a certain beam pointing direction, and performs low-sidelobe processing on the elevation direction and the azimuth direction respectively during transmitting and receiving beam forming, so that the low-sidelobe effect of the whole array is realized, wherein the transmitting beam adopts only phase weighting, and the receiving beam adopts amplitude and phase weighting.

The invention discloses a synthetic aperture radar broadband radio frequency interference detection method and system based on out-of-band signal energy, a storage device and electronic equipment, and the method comprises the following steps: carrying out the range Fourier transform of broadband interference echo data, and converting the data into an azimuth time domain-range frequency domain; extracting signals outside a frequency band to obtain an out-of-band energy matrix only containing noise and radio frequency interference; summing pulse by pulse along the distance direction according to the out-of-band energy matrix to obtain a final energy sequence of which the length is the azimuth sampling number; gaussian weighted moving average filtering is carried out on the energy sequence; calculating the filtered data by using an Otsu algorithm to obtain a self-adaptive threshold value; and segmenting the energy sequence based on a filtering result and an adaptive threshold to obtain an interference detection result. According to the invention, whether the pulse of the synthetic aperture radar echo contains the broadband radio frequency interference can be detected with high precision, so that the interference suppression efficiency is greatly improved, and the interference can be suppressed accurately and effectively subsequently.

The invention discloses an improved real aperture slope radar antenna aiming calibration method. The method specifically comprises the following steps: establishing a conversion relation of two rectangular coordinate systems through coordinates of three known points in two coordinate systems; solving azimuth direction and pitching direction error values of the real coordinates of any point and the radar measurement coordinates; error calibration is achieved by adjusting the telescopic devices in the two directions through a physical method. According to the method, the aiming calibration process of the real-aperture slope radar antenna is simplified, a traditional complex multi-parameter software modification method is replaced by establishing the conversion relation between the total station equipment and the radar coordinate system, calibration steps and workload are remarkably reduced, operation convenience is improved, in addition, mechanical calibration is carried out by adopting a physical adjustment mechanism, and the calibration precision is improved. And program internal error correction is replaced, the complexity of multiple times of software debugging is avoided, the reliability and efficiency of the calibration process are improved, and on-site rapid deployment and application are facilitated.

The invention discloses a self-adaptive homogeneous pixel offset tracking glacier time sequence monitoring method and system, and belongs to the technical field of image processing, and the method comprises the steps: obtaining a plurality of groups of dual-time-phase SAR image pairs of a glacier; performing image recognition on the dual-time-phase SAR image pair, and outputting a binary segmentation result of a glacier change boundary; a binary segmentation result is used as mask input of pixel offset tracking, and a self-adaptive homogeneous pixel matching window is constructed by distinguishing a changing area and a non-changing area in a pixel offset tracking window, so that matching windows of master and slave images of a dual-time-phase SAR image pair only contain homogeneous pixels with the same changing characteristics as a central pixel, and the matching windows of the master and slave images of the dual-time-phase SAR image pair only contain homogeneous pixels with the same changing characteristics as the central pixel. Normalization matching is carried out; and when the local SNR of the homogeneous pixel matching window is smaller than a preset signal-to-noise ratio threshold value, performing offset calculation by adaptively adjusting the size of the window in the row and column directions, and outputting LOS-direction and azimuth-direction two-dimensional timing sequence offset results. According to the method, the glacier change detection accuracy and the deformation calculation precision can be comprehensively improved.

The utility model provides a scanning module and a laser radar. The scanning module is applied to the laser radar comprising a transmitting optical system and a receiving optical system. The scanning module comprises a deflection element used for receiving the laser beam emitted by the emission optical system and deflecting the laser beam to a measured object in a pitching direction; the motor is used for supporting and driving the deflection element to rotate in the azimuth direction and deflecting the laser beam to a measured object in the azimuth direction; the deflection element is also used for receiving laser echoes reflected by the measured object and deflecting the laser echoes to the receiving optical system; and the scanning control panel is electrically connected with the deflection element and / or the motor and is used for controlling the pitching deflection angle of the deflection element and / or controlling the deflection frequency of the deflection element and the rotation frequency of the motor. While the view field range of the laser radar in the horizontal direction is improved, the complexity and the light adjustment difficulty are reduced, and different scanning modes are adaptively switched according to the use scene.

The application discloses a SAR pixel offset tracking deformation estimation method and system based on an iterative adaptive window, and comprises the following steps: acquiring two scenes of SAR images of a target area at different times; constructing an elliptical registration window according to the resolution ratio of the range direction and the azimuth direction of the SAR images; calculating the similarity plane of the master-slave image registration window; constructing a robustness index of offset estimation; judging whether the stability index reaches a threshold value; if the stability index threshold value is not reached, taking the elliptical registration window as an initial window, expanding in multiple directions, taking the registration window with the highest similarity as the optimal expansion direction, until the robustness index of the current registration window reaches the threshold value; and then acquiring the maximum position of the two-dimensional similarity plane of the optimal registration window, so as to determine the two-dimensional pixel offset. The application realizes adaptive optimization of the optimal shape and size of the offset estimation registration window, improves the precision of deformation estimation, and retains the deformation detail information.

The present invention provides a method for inspecting the angular resolution of a LiDAR device, comprising the steps of: preparing a LiDAR device to be inspected and at least one target; rotating, in N steps, the LiDAR device to be inspected, in the azimuth direction or altitude direction, and recording, at each rotation angle of the N steps, a plurality of frames for the target through the LiDAR device to be inspected; selecting, from the frames, at least one data point among data points calculated by the LiDAR device to be inspected; and determining, on the basis of the selected data point, the angular resolution of the LiDAR device to be inspected.

The invention relates to a high and low orbit cooperative satellite-borne multi-base SAR high-quality imaging segmental arc design method, and belongs to the technical field of radar imaging. Establishing a high and low orbit cooperative satellite-borne multi-base SAR imaging geometric model; calculating echo spatial spectrum distribution of each receiving station; determining a starting point range of an imageable arc section from the receiving station according to the alignment consistency constraint of the spatial spectrum; determining the velocity vector direction range of the slave receiving station according to the rotation angle boundaries of the extension directions of the spatial spectrums of the master and slave receiving stations; calculating the ratio of the range resolution to the azimuth resolution of the imaging result, and determining the velocity vector of each receiving station in combination with the bandwidth of the transmitted signal; preliminarily determining a high-quality imaging arc section through combined constraint of an observation squint angle and a spatial spectrum interval; and taking an intersection of the arc ranges, and outputting a final high-quality imaging arc design result. According to the method, the final imageable arc section is determined through constraint conditions such as radar sight and spatial spectrum interval distribution, and the optimal observation arc section of the receiving station is selected within a certain observation time to obtain a high-quality imaging result.

The invention relates to a target searching method and device and a photoelectric searching system, and relates to the technical field of target detection. The method comprises the following steps: receiving azimuth rotating speed and azimuth code disc information sent by azimuth servo equipment in a process of rotating along an azimuth direction; the photoelectric sensor is triggered to image according to the azimuth rotating speed and the azimuth code disc information, the photoelectric search system is fixedly connected to the azimuth servo equipment, and the photoelectric search system is provided with a pitching servo mechanism capable of adjusting the photoelectric search system to rotate in the pitching direction; determining a current azimuth angle of the target and a current pitch angle of the target according to a current frame image obtained through imaging; and correcting the current azimuth angle and the pitch angle of the target according to the inclination angle matrix between the photoelectric search system and the azimuth servo equipment so as to obtain the corrected azimuth angle and the corrected pitch angle. By means of the method, the convenience, efficiency and accuracy of target searching based on the photoelectric searching system can be improved.

The application discloses a GEO SAR time-varying ionosphere error compensation method based on maximum contrast self-focusing, and belongs to the technical field of GEO SAR (Geosynchronous Earth Orbit Synthetic Aperture Radar). The method selects distance line signals from a GEO SAR image, the distance line signals are the signals with the same distance time in the azimuth direction, the average power of each distance line signal in the image is calculated, a part of the distance line signals are selected, then the contrast of the SAR image is used to iteratively estimate the quadratic phase error coefficient, the cubic phase error coefficient is iteratively estimated based on the quadratic phase error coefficient, and finally the obtained quadratic and cubic phase error coefficients are used for phase compensation of the original SAR image, so that the SAR image affected by the time-varying ionosphere is accurately compensated. Experiments prove that the contrast of the compensated SAR image is improved by the method, and the compensated image is good, and is close to the image not affected by the time-varying ionosphere.

An ultrasonic sonar device 1 includes a detection results image generation means 17 that generates a horizontal detection results image 22 that represents latest detection results in colors that correspond to the intensity of reflected waves reflected from each position within a prescribed range on the basis of a reception signal for reflected ultrasonic waves TB reflected from prescribed directions that include at least a plurality of directions set in azimuth directions. The detection results image generation means 17 generates the horizontal detection results image 22 such that the colors assigned to positions within the prescribed range that are shallower than the depth of a water bottom SB and the colors assigned to positions within the prescribed range that are deeper than the depth of the water bottom SB are different.

A method for use in positioning of a user equipment, the method including: acquiring, at the user equipment, a first satellite vehicle signal from a first satellite vehicle of a plurality of satellite vehicles; obtaining, at the user equipment, ephemeris data from the first satellite vehicle signal; and providing to an entity, based at least on the ephemeris data, a plurality of elevation mask indications corresponding to a location of the user equipment and each indicating an azimuth direction and an elevation angle range, if any, of potential satellite vehicle visibility in the indicated azimuth direction.

The application provides a SAR image offset tracking method which is not affected by patch errors, comprising the following steps: step 1, data preprocessing; step 2, obtaining a cross-correlation coefficient matrix related to a pixel to be measured in a main image based on a statistical method and an INFLO algorithm; step 3, calculating offset in a range direction and an azimuth direction by normalizing the peak position of the cross-correlation coefficient matrix and a SAR single-view complex image pixel; and step 4, performing steps 2-3 pixel by pixel, so as to obtain a ground surface offset map covering the regions of two SAR single-view complex images. The application can effectively remove patch errors and reduce the loss of normal offset, thereby effectively improving the precision of SAR image offset tracking results, and can adapt to SAR image data of different types and different regions, and has stronger practicability.

The invention discloses a method for realizing straight pyramid scanning by a communication-in-moving antenna. The method comprises the following steps: determining the value of a scanning position point number parameter N; determining values of an expected azimuth angle alpha 0 and an expected pitch angle beta 0 of the current antenna; setting a scanning counter i; determining the value of the maximum scanning offset angle delta A in the azimuth angle direction and the value of the maximum scanning offset angle delta E in the pitch angle direction, and calculating the values of parameters phi 1 and phi 2; when i is less than 4N, calculating a parameter theta i, calculating a scanning offset angle delta i, calculating a scanning track beta i of a pitch angle, and calculating a scanning track alpha i of an azimuth angle; the pitch angle of the antenna is controlled to rotate to a new position beta i, and the azimuth angle of the antenna is controlled to rotate to a new position alpha i; and updating the scanning counter i, i = mod (i + 1, 4N), and returning to execute. The method is suitable for a communication-in-moving antenna with a convex cross section of a beam main lobe directional diagram, the application range is wider than that of elliptic cone scanning, and a higher average receiving level can be obtained.

The application relates to an interactive arbitrary-angle squint SAR point target evaluation method and device, which comprises the following steps: extracting the global peak point position coordinates from the two-dimensional complex data containing a target point to be evaluated after preprocessing; obtaining two local regions corresponding to the azimuth direction and the range direction respectively on the two-dimensional complex data after preprocessing through an interactive interception mode; extracting the strongest value points in the two local regions as the azimuth direction control point and the range direction control point respectively; calculating the corresponding slice slope according to the global peak point position coordinates, the azimuth direction control point coordinates and the range direction control point coordinates; extracting the azimuth direction profile data and the range direction profile data on the two-dimensional complex data through corresponding modes after judging the slice slope; and finally calculating the evaluation parameters according to the azimuth direction profile data and the range direction profile data, so as to realize the evaluation of the arbitrary-angle squint SAR point target.

The invention discloses a synthetic aperture radar imaging suppression method based on time domain metasurface phase modulation optimization. The synthetic aperture radar imaging suppression method comprises the following steps: determining a model of a radar echo signal according to radar parameters; respectively determining a distance direction modulation sequence model and an azimuth direction modulation sequence model based on the radar echo signal model; an optimization model is determined based on the models of the range direction modulation sequence and the azimuth direction modulation sequence, and the two optimization models are the same in form and are both used for one-dimensional matched filtering; respectively solving the two optimization models by adopting an optimization method to obtain an optimal distance direction modulation sequence and an optimal azimuth direction modulation sequence; determining an outer product of the optimal distance direction modulation sequence and the optimal azimuth direction modulation sequence to obtain a metasurface modulation matrix; and superposing the model of the radar echo signal and the metasurface modulation matrix to carry out imaging suppression in the distance direction and the azimuth direction of the target area. The peak amplitude of matched filtering and imaging results can be further reduced.

The present application provides a kind of lighting device, can utilize one lighting device switching overall illumination and local illumination.Light emitting device is characterized in that, on the first light guide plate (13) of circular plate shape with first main surface and first back and with first hole in the center, the second light guide plate (14) of circular plate shape with second main surface and second back and with second hole in the center is arranged, the reflective sheet (12) is arranged on the first back side of the first light guide plate (13), the liquid crystal lens (100) is arranged on the second main surface side of the second light guide plate (14), a plurality of first LED (20) is arranged along the circumference on the side of the first hole of the first light guide plate (13), a plurality of second LED (20) is arranged along the circumference on the side of the second hole of the second light guide plate (14), and the first LED (20) and the second LED (20) are arranged staggered in azimuth direction.

The embodiment of the invention provides a weather radar calibration method and device, equipment and a storage medium, and is applied to the technical field of radar calibration. The method comprises the following steps: carrying out one-dimensional section fitting on the obtained maximum intensity values of a distance direction, an azimuth direction and a pitching direction of a target sampling point to obtain corresponding fitting values; respectively calculating a corresponding beam width value, a beam center value and an amplitude maximum value according to each fitting value based on a preset calculation formula; and then parabola fitting is carried out on the distance to obtain the maximum amplitude value on a distance profile, then two-dimensional curved surface fitting is carried out by adopting the maximum amplitude values of different orientations and pitching, and finally the actual maximum amplitude value corresponding to the metal ball is determined. In this way, the accuracy and practicability of metal ball calibration can be remarkably improved.

A method is provided for operating a synthetic aperture radar (SAR) to acquire image data of a mapping strip comprising one or more sub-mapping strips, wherein the SAR is carried on a platform moving along the flight direction and a radiated beam is directed to the mapping strip. The method includes: for each cluster, electronically manipulating the beam in the azimuth direction along the sub-mapping strip; and mechanically manipulating the beam in the opposite direction to the flight direction during each cluster. This method allows for improved mapping strip resolution.