26 results about "Azimuth" patented technology

Provided is a method for preparing a two-dimensional metallic photonic crystal structure in large area through femtosecond laser direct writing. The invention provides a method and experiment device for preparing the periodically-distributed two-dimensional photonic crystal structure with the feature size being the sub-micron dimension in one step in the large area by focusing identical-wavelength double-pulse femtosecond laser on the surface of metal through a plano-convex cylindrical lens, and the identical-wavelength double-pulse femtosecond laser is obtained based on the spectrophotometry of birefringent crystals and has the features of collinear transmission, cross polarization and picosecond time delay. Two-dimensional periodic structure patterns can be effectively regulated and controlled by changing the energy and the number of pulses of input laser, the thicknesses and the azimuth angles of the birefringent crystals and the like. Through the combined design of different linear polarization directions and the variable time delay feature of two femtosecond laser pulses and focusing of the cylindrical lens, preparation of the two-dimensional metallic photonic crystal structure within the large area is achieved conveniently and quickly. The novel preparation method adopting the double-pulse femtosecond laser with cross polarization and variable time delay has potential important applications in the field of material micro-nano processing and preparation.

The present invention relates to a shipborne satellite communication system and a method for a shipborne antenna to track a satellite. The shipborne satellite communication system comprises an antenna base, a satellite communication antenna, an MEMS inertial measurement unit and a servo driving unit; the satellite communication antenna is arranged at the antenna base and is used for receiving and transmitting the Ku or L-band communication signals of a geostationary orbit communication satellite or a small-angle geostationary orbit communication satellite; and the MEMS inertial measurement unit is arranged on the antenna base and is used for acquiring the attitude parameters of a hull; and the servo driving unit is arranged on the antenna base and is used for driving the satellite communication antenna to rotate so as to adjust the azimuth angle, pitch angle and polarization angle of the satellite communication antenna. With the shipborne satellite communication system and the method for the shipborne antenna to track the satellite of adopted, the satellite communication antenna can accurately track the satellites in a surge state, the installation complexity of the MEMS inertial measurement unit is decreased. The overall structure of the shipborne satellite communication system is compact, and the size of the shipborne satellite communication system is small.

The present invention relates to a single horizontal array passive speed measurement and distance measurement method based on sound field interference fringe, belonging to the field of underwater acoustic engineering and sonar signal processing. The method comprises a step of carrying out condition processing and collection on the signal received by each array element of a sonar, a step of carrying out beam formation on the collected signals and obtaining an azimuth time journey map after accumulation, a step of tracking an interested object, taking a tracking beam as object azimuth estimation, carrying out short-time Fourier transform spectrum analysis on the output of the tracking beam, obtaining the interference structural map of the interested object, selecting two equal time intervals of a single horizontal array in a motion process, forming interference structural maps, carrying out preprocessing and Radon transform on the two interference structural maps, and estimating an object heading angle with the combination of the waveguide invariant theory, and a step of realizing the estimation of the distance and speed of the interested object. According to the method, the physical nature of an underwater sound field is fully dug, the prior knowledge of a marine environment is not needed, the algorithm is simple and easy and is convenient and flexible to use, and the application prospect is wide.

A radar sensor and a corresponding method for distance and cruise control of a vehicle are described; using this sensor and method, objects in front of the vehicle in the direction of travel are detected and at least the variables: distance, relative velocity, and azimuth angle of the detected objects are ascertained with regard to the vehicle, the change over time of the reflection point of the radar beam on the object and classification of the detected object being determined as a function of the change over time of the reflection point.

The invention discloses a rapid target extraction method for SAR azimuth estimation. The rapid target extraction method includes following steps: S1, determining a seed threshold and a growth threshold; S2, regarding pixel points whose gray value is greater than the seed threshold as target seed points; S3, regarding the pixel points whose grey value is greater than the growth threshold around the seed points as new target seed points and adding the target seed points to a target list; S4, regarding the pixel points which satisfy a set neighborhood condition around the seed points as the new target seed points and adding the target seed points to the target link; and S5, outputting a dual-value matrix used for expressing whether image pixel points are the target points as the final target image. According to the rapid target extraction method, the distribution condition of the target and noise is not needed to be assumed, and the problem of low segmentation precision of the conventional method is overcome; the method of secondary growth based on the target list is employed to look for the target, the precision is guaranteed, the false alarm phenomenon in target extraction is suppressed, subsequent "false" target removal processing is prevented, and the target extraction speed is increased.

The image projection system includes a projection-type display apparatus that projects an image onto a projection plane and has a first azimuth detector, the first azimuth detector detecting a projection azimuth; an imaging apparatus that images a projection screen of the image and has a second azimuth detector, the second azimuth detector detecting an imaging azimuth; and a signal processor that performs correction processing of the image. The signal processor includes an estimation unit and a correction unit, the estimation unit estimating an inclination of the projection-type display apparatus to the projection plane on the basis of the projection azimuth detected by the first azimuth detector, the imaging azimuth detected by the second azimuth detector, and the captured image acquired by the imaging apparatus; and the correction unit correcting a shape of the projection screen on the basis of the inclination of the projection-type display apparatus estimated by the estimation unit.

The present invention relates to satellite autonomous relative navigation. In order to solve the problem of long-distance autonomous relative navigation, the present invention provides a relative navigation method using the line-of-sight angle information on the satellite. ;Establish the system model in the modified spherical coordinate system; carry out filter calculation. Compared with the existing technology, its advantages and beneficial effects are: no active ranging equipment is required to work, only the elevation angle and azimuth angle of the target need to be detected by the passive tracking and aiming equipment, combined with the relative navigation initial value, the relative navigation can be passed The filtering algorithm realizes real-time autonomous estimation of relative position and relative velocity, and provides the required information for relative orbit control. The relative navigation with only angle information is realized, so that the active star in the orbital rendezvous mission can realize autonomous relative navigation at a long distance, and the reliability of the rendezvous mission is improved.

The invention discloses a controlled ultra-short radius guiding well drilling system and method, and relates to the technical field of well drilling, the system comprises a drilling machine, a conventional drill rod, a flexible drill rod structure, a data relay transmission short section structure, a flexible motor structure, a measurement-while-drilling short section structure and a drill bit which are connected in sequence; the measurement-while-drilling short section structure is used for measuring well deviation and azimuth information; the data relay transmission short section structure is used for receiving well deviation and azimuth information measured by the measurement-while-drilling short section structure and sending the well deviation and azimuth information to a drilling machine; the flexible drill rod structure comprises at least one flexible drill rod short section, and the flexible motor structure comprises at least one flexible motor. The well drilling method can be used for directional well drilling and composite well drilling. According to the method, the purposes of well track control and drilling speed increasing and efficiency increasing of the ultra-short radius directional well are achieved.

The invention discloses a solar cell panel mounting bracket. The bracket comprises a mounting base, a first worm mounting plate, a first worm, a first worm gear, a connecting column, a motor, a microcomputer time control switch, a barrel, a second worm mounting plate, a threaded barrel, a column, a first U-shaped connecting piece, a second U-shaped connecting piece, a Z-shaped clamping piece, a threaded column, a frame, a second worm gear, a frame connecting piece, a square connecting rod, a mounting plate, a U-shaped plate, a roller, a second worm, a rocking handle, a reinforcing rib and an L-shaped clamping piece. According to the invention, the bracket is provided with an included angle adjusting mechanism, so a user can rotate the rocking handle at the end of the second worm by himself/herself to adjust the included angle of a device in different seasons, the operation is convenient and simple and there is no need of professionals, thereby greatly facilitating the adjustment of theincluded angle of the device. The bracket can conveniently move along in the irradiation direction of the sun through an azimuth angle adjusting mechanism, thereby facilitating the improvement of theoptimal illumination time of the solar cell panel.

The invention discloses a multi-frequency community antenna. The antenna comprises a support frame and at least two base plates, wherein radiation units of corresponding frequencies are arranged on each base plate, thus forming a radiation array; and horizontal azimuths of the base plates can be independently adjusted. According to the multi-frequency community antenna, the horizontal azimuths of antennas of different frequencies can be flexibly and independently adjusted according to coverage regions, therefore, network optimization is convenient.

The invention provides a direction finding method based on a radio frequency analog receiving system. The method comprises steps of obtaining the phase difference between each path of antenna and an adjacent antenna through a phase discriminator for an N-element uniform circular array antenna, and recording the phase difference as the phase difference of the phase discriminator; recording the phase difference of each phase discriminator as an initial phase difference when an incoming wave enters the circular array antenna at an elevation angle of 0 degree; constructing a plurality of phase discriminators corresponding to each phase discriminator; according to an elevation angle and an azimuth angle, k is the number of iterations, and calculating the theoretical phase difference of each phase discriminator; introducing a vector X and a direction vector G, and calculating an elevation angle and an azimuth angle of a two-dimensional incident angle of iteration times k+1 in combination with the constructed complex number, calculating the difference between the two-dimensional incident angle with the iteration frequency of k+1 and the iteration frequency of k, comparing the two-dimensional incident angle with a threshold value, and entering an output elevation angle and an azimuth angle when the two-dimensional incident angle is smaller than the threshold value, otherwise, adding 1to the value of k, and calculating the theoretical phase difference. The method is advantaged in that problems of logic judgment and other operations, phase ambiguity and unbalanced amplitude of an input signal of the phase discriminator are avoided, and direction finding precision is improved.

The invention relates to a monocular camera-based sea surface distance measurement method and system, and the method comprises the steps: measuring the camera pose angle information of a monocular camera and the ship pose angle information of a ship, carrying out the calculation to obtain a camera rotation matrix and a ship rotation matrix, and according to the altitude of the camera, the camera rotation matrix and the ship rotation matrix, acquiring an internal parameter and a distortion parameter of a monocular camera, calculating to obtain a system rotation matrix and a system translation matrix, acquiring a pixel coordinate of an image shot by the camera, further converting the pixel coordinate into a sea surface physical coordinate according to the internal parameter and the distortion parameter of the monocular camera, the system rotation matrix and the system translation matrix, and completing data measurement between a target point and a ship. According to the invention, the problems of high distance measurement difficulty and large distance measurement error in a sea surface distance measurement scene are solved, measurement of data such as the distance between the target ship and the target point, the azimuth angle of the target ship and the width of the ship body in sea surface measurement is realized, and the accuracy of data measurement in sea surface distance measurement is improved.

The invention provides an auxiliary positioning system for reflective stickers. The auxiliary positioning system comprises a plurality of reflective stickers and a mobile platform. The reflective sticker is arranged in a navigation space. The mobile platform comprises a map establishing module, a positioning module, a laser scanning analysis module, a coordinate processing module, a judgment and comparison module and a correction module. The map establishing module is used for establishing a full-area map corresponding to the navigation space. The positioning module is used for positioning a positioning coordinate. The laser scanning analysis module is used for scanning the navigation space and obtaining a scanning azimuth distance coordinate of the reflective sticker relative to the mobile platform. The coordinate processing module forms a positioning azimuth distance coordinate according to a sticker point coordinate and the positioning coordinate. The judgment and comparison modulecompares the scanning azimuth distance coordinate with the positioning azimuth distance coordinate, and corrects the positioning coordinate through the correction module.

The invention provides a multi-caliber movable unfolding antenna and belongs to the field of antenna technologies. The multi-caliber movable unfolding antenna comprises an unfolding back frame, an unfolding arm, a two-dimensional unfolding mechanism and multiple reflector components, wherein the multiple reflector components are fixed to different positions of the unfolding back frame, one end ofthe unfolding arm is connected with the unfolding back frame, the other end of the unfolding arm is connected with the two-dimensional unfolding mechanism, and the two-dimensional unfolding mechanismis used for driving the unfolding arm to rotate, so that all the reflector components fixed to the unfolding back frame realize azimuth and pitch rotation. According to the antenna, overall beam global coverage can be realized just by adjusting the rotating angle of the two-dimensional unfolding mechanism.

The invention provides a delta facies sand body spatial form characterization method which comprises the following steps: S1, preprocessing observed seismic data through a variable coefficient guideddirection optimization spatial filtering technology to improve a signal-to-noise ratio; S2, under the guidance of the longitudinal superposition characteristics of the sand body gene units identifiedby the logging data, acquiring position characteristic parameters required for characterizing the spatial form of the sand body from the preprocessed seismic data; and S3, carrying out spatial direction sensitivity research on the sand body posture characteristic parameters in inclination angles, azimuth angles and time directions to obtain optimized parameter values of equalization distribution processing. The challenge faced by the conventional method for characterizing the gene unit in the delta facies sand body is solved, and the increasingly increased high-precision characterization requirement of the reservoir in the oil and gas field development is met.

The invention provides a while-drilling azimuth detection data synchronization method and equipment, and the method comprises the steps that a control module starts a timer to record first time according to a measurement starting command sent by a tool face angle measurement module, and sends a detection signal collection starting command to a detection signal collection module; the detection signal acquisition module performs parameter configuration according to the detection signal acquisition starting command, and sends a work starting command to the control module based on a configuration completion state; the control module closes the timer and records second time according to the work starting command; and calculating a deviation angle according to the time difference between the first time and the second time, and correcting the tool face angle measurement module based on the deviation angle.

The invention discloses a positioning antenna, a positioning antenna assembly, a road side unit, and a DSRC application system. The positioning antenna comprises at least three receiving antennas, wherein equivalent phase centers of the receiving antennas are all on a same straight line, distances exist between the equivalent phase centers of the receiving antennas, at least one of the distances d12 is less than lambda, and at least one of the distances d13 is greater than N lambda. According to the positioning antenna of the invention, microwave signals from an OBU can be received by adopting at least receiving antennas which are arranged according to a certain distance, so a RSU can be conveniently used to calculate an azimuth angle corresponding to the microwave signals transmitted by the OBU through a phase difference method after the microwave signals are processed correspondingly by the RSU, and accurate positioning information of the OBU can be calculated according to the azimuth angle to determine whether the OBU is located in an antenna coverage region of the RSU, so that adjacent channel interference and vehicle following interference problems can be effectively solved.

The invention provides an OVT gather processing method and device for PS wave seismic trace data and electronic equipment. The method comprises the steps that PS wave seismic trace data are mapped on a surface element grid of the CCP, a projection point of an imaging point of the PS wave seismic trace data relative to the earth surface is used as a center, a virtual shot point of the surface element grid relative to the PS wave seismic trace data is determined, and the virtual shot point and an original shot point of the surface element grid relative to the PS wave seismic trace data have the same shot-geophone distance. And based on the travel time of the PS wave seismic trace data at the virtual shot point reflected by the surface element grid, correcting the time distance curve to hyperbolic time distance relation of the PS wave seismic trace data, so that the PS wave seismic trace data is positioned on the common center point of the corrected seismic trace data relative to the conversion point reflected by the surface element grid. PS wave seismic trace data is mapped on the offset line grid of the OVT, OVT gather extraction is carried out on the PS wave seismic trace data, an OVT gather of the PS wave seismic trace data is obtained, and extraction information comprises offset, azimuth angle, coordinates of CMP points and travel time.

The invention provides a pedestrian relationship identification method, device and system and an electronic device, and relates to the technical field of image processing. The method comprises the following steps of analyzing azimuth information of pedestrians in a target range in real time according to a group identification algorithm to obtain a target group; extracting face features of each group member in the target group; performing pairwise cross validation on the group members according to the face features to obtain a relative relationship score between every two group members; determining a target group member according to the relative relationship score and a preset threshold value, and generating a relative relationship network according to the target group member and the relative relationship score; connecting the target group members in the relative relationship network through edges, and taking the relative relationship score as the weight. According to the method, the complex relative relation chain which may appear in the pedestrian group can be identified, and the practicability is stronger.