23 results about "Conical scanning" patented technology

The invention relates to the technical field of satellite communication, and discloses a vehicle-mounted station satellite dynamic tracking device and method.The technical scheme is characterized in that the theoretical satellite alignment angle pointed by an antenna is calculated, the antenna is driven to rotate to the angle for coarse alignment, and picture frame searching is started when effective satellite signals are not captured; a main tracking mode and an auxiliary tracking mode are switched in a self-adaptive mode according to the real-time vehicle speed, and servo driving parameters are dynamically adjusted based on the processed tracking deviation to drive an antenna to track a satellite in real time; compensating the tracking angle of the antenna in real time; when it is judged that the satellite is lost, the current angle to which the antenna should point is predicted, and conical scanning is executed with the predicted angle as the center to recapture satellite signals. According to the invention, the adaptive hybrid tracking mode switching, multi-dimensional error real-time compensation and'inertial navigation prediction + conical scanning 'rapid recovery cooperation mechanism is adopted, and high-precision, high-stability and rapid-recovery satellite dynamic tracking under complex road conditions and high-speed movement is realized.

The invention relates to the technical field of microwave remote sensing, in particular to a Ku, Ka and W three-frequency-band meteorological radar multi-source joint detection system and method and a storage medium, and the system comprises an antenna feeder subsystem, a main control computer, an integrated digital processor, a Ku / Ka integrated radio frequency machine, a Ku-frequency-band power amplifier, a Ka-frequency-band power amplifier, a W-frequency-band transmitter, a W-frequency-band power amplifier, a W-frequency-band receiver and a servo mechanism. The system is designed according to a working mode and working parameters of a main control computer, realizes multiple functions such as Ku / Ka / W single-frequency-band independent working or multi-frequency-band simultaneous working and the like, and has co-polarization and cross-polarization echo signal receiving capability; by controlling the servo mechanism, two modes of fixed-point detection and conical scanning detection are realized, and detection requirements of different meteorological elements are met; the detection capabilities of three frequency bands of Ku, Ka and W are integrated in the system, the detection mode is flexibly configured according to weather conditions and detection requirements, the system has the multi-frequency-band, multi-polarization and multi-element integrated detection capability, and the detection efficiency of the meteorological radar is improved.

The invention provides a satellite-borne conical scanning Doppler radar three-dimensional wind field inversion method and device, and the method comprises the steps: dividing a radar observation strip region into a plurality of sub-blocks, enabling the adjacent sub-blocks to have region overlapping, and carrying out the parameterization of a horizontal wind field of each height layer in each sub-block through a segmented continuous change hypothesis; obtaining an optimal horizontal wind field parameter of each height layer in each sub-block by using a variational method, determining a horizontal wind field in each sub-block according to the optimal horizontal wind field parameter, and carrying out linear weighted fusion on the horizontal wind fields at corresponding positions of each sub-block in the overlapping region to obtain a final horizontal wind field; and calculating horizontal divergence according to the optimal horizontal wind field parameter of each height layer in each sub-block, carrying out integration on the horizontal divergence in the height direction by using an atmospheric mass conservation equation to obtain a vertical wind field, and carrying out linear weighted fusion on the vertical wind fields at corresponding positions of each sub-block in the overlapping region to obtain a final vertical wind field. According to the invention, continuous and steady three-dimensional wind field inversion of the satellite-borne conical scanning Doppler radar is realized.

To provide a fish quantity information display system and a fish quantity information display method that are capable of displaying an image that allows a user to accurately and easily grasp the quantity of fish present on the wake of its own ship.SOLUTION: A fish quantity information display system 10 includes: an underwater detection device 100 that detects a fish school by scanning a receiving beam along a conical scanning surface; and a plotter device 200 that displays its own ship's current position and a track to the current position. The underwater detection device 100 includes: a fish quantity index calculation unit that calculates a fish quantity index based on electrical signals output from multiple ultrasonic vibrators; and a communication unit that transmits the fish quantity index to the plotter device 200. The plotter device 200 includes: a communication unit for receiving the fish quantity index; and a fish quantity display superimposition unit that displays fish quantity information based on the fish quantity index in association with the track.SELECTED DRAWING: Figure 3

The application provides a kind of based on quasi-cone scanning's airborne depth laser radar system structure error's calibration method and device, comprising: establishing structure error calibration field;Global control coordinate system is established, and the coordinates of global control point, survey station, local control point and airborne depth laser radar mirror center are obtained using total station;Based on laser radar, the slant range from mirror center to laser reflection is obtained, and the laser foot point is pasted, and the laser foot point coordinates are obtained using total station;Based on the displacement and rotation geometric relationship between laser scanning reference coordinate system and global control coordinate system, error equation is constructed according to slant range, drive motor rotation angle and laser foot point coordinates;Based on the least square indirect adjustment principle, error equation is solved iteratively, and the structure error value of airborne depth laser radar system is obtained.The application can accurately obtain the structure error value of quasi-cone scanning airborne depth laser radar, and significantly improve the measurement quality and reliability of the whole depth measurement system.

The invention relates to a circle center updating method and device of a phased-array antenna and a phased-array antenna system. The method comprises the following steps: acquiring a frequency point, an azimuth angle and a pitch angle pointed by a current beam in the process of executing conical scanning by the phased-array antenna, and acquiring a corresponding pitch angle adjustment coefficient table from a pre-constructed antenna frequency point adjustment coefficient mapping table according to the frequency point pointed by the current beam, determining a current conical scanning step length and a deviation angle from a pitch angle adjustment coefficient table, collecting signal intensity of the phased-array antenna moving to each preset position point in the conical scanning execution process, and determining an azimuth angle adjustment value and a pitch angle adjustment value according to the signal intensity of each preset position point, and determining a target beam direction according to the azimuth angle, the pitch angle, the azimuth angle adjustment value and the pitch angle adjustment value, and controlling the phased-array antenna to execute subsequent conical scanning by taking the target beam direction as a circle center. And the tracking precision and the system adaptability of the phased-array antenna in a complex scene are remarkably improved.

The application discloses a ground debugging system of a conical scanning single-photon laser radar and belongs to the technical field of single-photon laser radars. The system aims at solving the problem of low efficiency of coaxial adjustment and error correction of the conical scanning laser radar. The system comprises a base, a debugging installation platform, a positioning and orientation system, a radar data acquisition and control unit and a conical scanning single-photon laser radar. The debugging installation platform is used for debugging and correction on the ground, and the laser radar can efficiently simulate the movement of a carrier. The debugging steps of the laser radar after actual installation are simplified, and repeated steps in the use process are reduced. The radar data acquisition and control unit with the FPGA as the core is used to realize high time-precision control of the remaining parts, high-speed low-latency data acquisition and storage of the parts, and reduction of the introduced error in the debugging. The use of the area array GM-APD detector effectively reduces the data accumulation time of the laser radar using the GM-APD, and improves the frame rate of the laser radar based on the GM-APD.

A passive remote sensing and reconnaissance integrated detection method based on a conical scanning system belongs to the technical field of space microwave remote sensing, and comprises the following steps: carrying out AD acquisition on an intermediate frequency signal output by a multi-band radiometer receiver; carrying out FFT (Fast Fourier Transform) change on the data acquired by the AD to divide the data into a plurality of channels, and carrying out RFI (Radio Frequency Identification) detection on each channel; if the RFI exists in the channel, IFFT and SFFT are sequentially carried out on a channel result with the RFI to obtain channel time-frequency information, parameterized measurement is carried out on the channel time-frequency information to obtain target pulse description word information, and then the target pulse description word information and channel data without RFI detection are packaged and output together. According to the invention, joint detection of satellite-borne microwave radiation detection and electronic reconnaissance is realized, the signal-to-noise ratio of satellite-borne electronic reconnaissance detection is improved, the detection capability is improved, the influence of RFI on the satellite-borne microwave radiometer is reduced, and the high-precision detection capability of a radiometer system is ensured.

The invention discloses a shipborne transportable fast-assembly antenna, and relates to the technical field of antennas. The antenna comprises a base, a seat frame and a reflecting surface. The base is quickly fixed with the ship body through the vacuum chuck without welding; the seat frame is of an A-E-C three-axis full turntable structure and is used for driving the reflecting surface to move; and the reflecting surface is formed by splicing a central reflecting surface and a plurality of side reflecting surfaces through lock catches. The servo control system of the antenna integrates the functions of initialization self-checking, automatic pointing, searching and automatic tracking, and can automatically align and track a satellite according to navigation and attitude information. A self-adaptive tracking strategy combining conical scanning and stepping tracking is innovatively adopted, conical scanning can be intelligently started and stopped according to the signal intensity, the tracking precision is ensured, meanwhile, mechanical abrasion of a transmission structure is remarkably reduced, and the service life of equipment is prolonged. The whole system has the advantages of being rapid in deployment, convenient to disassemble and assemble, reliable in tracking, high in adaptability and the like, and is particularly suitable for communication scenes needing maneuvering layout such as ships and warships.

This invention discloses a simulation method and system for three-dimensional cloud precipitation detection based on a spaceborne conical scanning radar. The method simulates a three-dimensional cloud field and acquires water condensate information by inputting typical cloud precipitation scene data into a numerical model; it establishes a water condensate particle spectrum and microphysical model, and calculates its scattering and attenuation characteristics using a T-matrix; it simulates a wide-swath three-dimensional scanning trajectory based on satellite orbital parameters and conical scanning geometry; it matches the trajectory with the cloud field using the nearest neighbor method and calculates the radar reflectivity factor before and after attenuation; finally, it reconstructs the three-dimensional gridded radar echo data using a range-weighted method. This invention overcomes the shortcomings of existing simulation technologies in completely reconstructing wide-swath three-dimensional cloud and rain structure and wind field information, and can simulate three-dimensional radar observation scenarios of weather systems such as typhoons with high fidelity, providing an effective simulation verification platform for the system design and parameter optimization of next-generation spaceborne conical scanning radar.

The application provides a microwave mobile station control method and system based on two-stage alignment, wherein the method comprises the following steps: positioning the microwave mobile station and the unmanned aerial vehicle by using a positioning system, and calculating an azimuth angle and a pitch angle according to the unmanned aerial vehicle coordinates and the microwave mobile station coordinates; driving the microwave mobile station and the unmanned aerial vehicle to move according to the unmanned aerial vehicle coordinates, and rotating the microwave antenna of the microwave mobile station according to the azimuth angle and the pitch angle to coarsely align the microwave mobile station and the microwave antenna of the unmanned aerial vehicle; and finely aligning the microwave mobile station and the microwave antenna of the unmanned aerial vehicle by using a conical scanning mode. The application coarsely aligns according to the azimuth angle and the pitch angle calculated according to the northeast celestial coordinate system, and then finely aligns by using a conical scanning mode, so that the hardware cost is much lower than that of a single-pulse measurement mode requiring multiple channels, the application can be applied to remote areas, and the application does not simply rely on the RSSI voltage of the station, so that the interference of environmental factors such as atmosphere and rainfall is reduced, and two-stage microwave antenna alignment is realized.

This application relates to the field of radio direction finding technology, and in particular to an antenna tracking and alignment method and system based on conical scanning. The method includes: normalizing the amplitude envelope by frame division using a scanning phase reference signal; normalizing the deviation between the mean amplitude of the sub-window and the predicted value to obtain the real-time residual mean; generating inter-period jump degree and kinematic discrimination threshold simultaneously through a multi-period sliding window for azimuth and elevation angle errors; determining the number of re-evaluation periods based on the ratio of the two; freezing the elite parameter combination and successively calculating the fitness to obtain the elite stability; fusing the real-time residual mean and inter-period jump degree to obtain a signal quality score; driving the switching phase of the Skyhawk optimization algorithm; triggering elite degradation when the elite stability exceeds the adaptive discrimination threshold; and outputting the optimal parameter combination to complete beam alignment. The technical solution of this application enables continuous and accurate tracking in radar cross-section random scintillation scenarios.

A method and apparatus for calibrating structural errors in a conical scanning airborne bathymetric LiDAR system are provided. The method includes: establishing a structure error calibration field; establishing a global control coordinate system, and acquiring coordinates of global control points, survey stations, local control points and a reflector center by using a total station; acquiring slope distances from the reflector center to laser footprints on laser retroreflective targets and drive motor rotation angles, and acquiring coordinates of the laser footprints by utilizing the total station; based on displacement and rotation geometrical relationships between a laser scanning reference coordinate system and the global control coordinate system, constructing an error equation based on the slope distances, the drive motor rotation angles, and coordinates of the laser footprints; and iteratively solving the error equation based on a least-squares adjustment of indirect observation principle to obtain structural error values of the LiDAR system.

A new measurement approach is disclosed that facilitates significantly smaller size, weight, and power (SWaP) spaceborne radar systems that can provide wide swath, high resolution observations. Multiple beams employed in the scan and the complex volume and / or surface backscatter signals of each beam is recorded. Each beam is electronically swept in azimuth where each beam is held at a constant incidence angle over the azimuth sector that covers the swath. Once the sweep is complete, the platform moves forward, by one along track pixel, and the sweep is repeated in order to provide continuous mapping of the volume and surface covered by the swath. Complex volume backscatter is recorded and mapped to each altitude layer to provide full mapping of the atmosphere.

The application relates to the technical field of satellite communication and discloses a kind of vehicle station satellite dynamic tracking device and method, and its technical scheme points are: the theoretical angle of pointing to satellite of calculating antenna, drive antenna to rotate to the angle and carry out coarse alignment, and start frame search when not capturing effective satellite signal;According to real-time vehicle speed, the main and auxiliary tracking modes are adaptively switched, and the servo drive parameters are dynamically adjusted based on the processed tracking deviation to drive the antenna to track the satellite in real time;The tracking angle of the antenna is compensated in real time;When judging star loss, the angle that the antenna should point to currently is predicted, and conical scanning is carried out with the predicted angle as the center to recapture satellite signal.The application adopts adaptive hybrid tracking mode switching, multi-dimensional error real-time compensation and "inertial navigation prediction + conical scanning" fast recovery cooperative mechanism, and realizes high-precision, high-stability, fast-recovery satellite dynamic tracking under complex road conditions and high-speed movement.

The application provides a kind of spaceborne conical scanning Doppler radar three-dimensional wind field inversion method and device, the method comprises: the radar observation strip area is divided into multiple sub-blocks, and there is area overlap between adjacent sub-blocks, and the horizontal wind field of each height layer is parameterized in each sub-block with piecewise continuity variation assumption;Variational method is used to obtain the optimal horizontal wind field parameter of each height layer in each sub-block, and the horizontal wind field in each sub-block is determined according to the optimal horizontal wind field parameter, the horizontal wind field of the corresponding position of each sub-block in the overlapping area is linearly weighted and fused to obtain the final horizontal wind field;The horizontal divergence is calculated according to the optimal horizontal wind field parameter of each height layer in each sub-block, and the vertical wind field is obtained by integrating the horizontal divergence in the height direction using the atmospheric mass conservation equation, and the vertical wind field of the corresponding position of each sub-block in the overlapping area is linearly weighted and fused to obtain the final vertical wind field.The application realizes the continuous and robust three-dimensional wind field inversion of spaceborne conical scanning Doppler radar.

The present application belongs to the field of active microwave remote sensing and ocean data processing technology, and particularly relates to a center frequency pre-biased local oscillator signal extraction method and extraction device, which comprises: a satellite-borne scatterometer performs fan beam conical scanning, and according to the relative motion between the satellite ground footprint coverage and the earth, a three-dimensional distribution of Doppler frequency offset with latitude, azimuth and elevation angle is obtained; according to the obtained three-dimensional distribution of Doppler frequency offset with latitude, azimuth and elevation angle, a Doppler frequency offset lookup table is generated according to the division interval of the azimuth angle; the center frequency of the local oscillator signal is pre-biased using the Doppler frequency offset lookup table according to the division interval of the azimuth angle, and a pre-biased local oscillator signal is obtained.

A wind observation device includes processing circuitry configured to: acquire a reception signal of each scattered light beam from a conical scanning sensor to repeatedly emit a laser beam toward a wind observation region and to receive scattered light of each laser beam scattered by aerosol present in the wind observation region; shift a frequency of each reception signal having been acquired using a frequency shift amount corresponding to each of a plurality of mutually different wind vectors and to integrate spectra of the plurality of reception signals after the frequency shift for each wind vector; and select a wind vector corresponding to a wind vector in the wind observation region from among the plurality of wind vectors on a basis of the integrated spectrum of the reception signals for each wind vector.

The present application belongs to the field of active microwave remote sensing and microwave scatterometer, and particularly relates to a kind of two-dimensional look-up table acquisition methods of spaceborne microwave scatterometer slice segmentation, the method comprises: obtaining the three-dimensional distribution of Doppler frequency offset with satellite platform subsatellite point latitude, azimuth and pitch;And based on the three-dimensional distribution, obtain Doppler frequency offset;Again, using the relationship between echo frequency and Doppler frequency offset of spaceborne sector-beam conical scanning microwave scatterometer, obtain the three-dimensional distribution of echo frequency of spaceborne sector-beam conical scanning microwave scatterometer with satellite platform subsatellite point latitude, azimuth and pitch;With equidistant ground slice as target, obtain the position of equidistant ground slice on the echo frequency corresponding to pulse sampling point, obtain the three-dimensional look-up table of slice segmentation;Dimension reduction optimization is carried out to three-dimensional segmentation look-up table, and two-dimensional look-up table of spaceborne sector-beam conical scanning microwave scatterometer slice segmentation is obtained.

The application belongs to the technical field of laser radar, and discloses a high-precision wind field inversion algorithm based on a buoy laser radar, which comprises the following steps: S1, a rectangular coordinate system is established with the position of the radar as the origin; the radar performs multi-beam conical scanning measurement of the wind field data of the target airspace with the pitch angle being beta; the radar is controlled to scan according to the set azimuth angle and pitch angle; and the radial data of each beam at each target distance library is detected. Through the detection of the target airspace, the view wind data of each scanning beam is obtained; after the view wind vector is compensated and corrected according to the attitude and motion speed of the buoy platform, the three-dimensional wind field information formed by the wind speed, wind direction and vertical airflow above the buoy platform is obtained through the inversion of the view wind data of the same height layer, so that the precision of the wind field inversion is improved.

The invention provides a mobile carrier satellite communication antenna tracking method and system, computer equipment and a storage medium, and relates to the technical field of satellite communication, and the method comprises the following steps: measuring and calculating attitude information of a mobile carrier in real time based on an inertial navigation technology; enabling an antenna axis to initially point to a satellite direction according to the attitude information; the satellite communication antenna is driven to conduct conical scanning around the calculation visual axis of the satellite communication antenna, carrier signal strength values are continuously collected, gradient analysis is conducted on the carrier signal strength to determine the relative direction of the actual direction of the strongest point of the signal center and the antenna calculation visual axis direction, and error correction is obtained; and taking the error correction as a feedback signal, performing fine adjustment on an antenna servo mechanism of the satellite communication antenna so as to align the strongest point of the signal center, and correcting an accumulated error generated in the attitude calculation process of the mobile carrier. According to the technical scheme provided by the invention, closed-loop feedback is carried out by combining an inertial navigation technology and a conical scanning technology, and blind area satellite alignment and dynamic satellite alignment can be realized.

A wind observation device (3) is configured so as to be provided with: a reception signal acquisition unit (31) that acquires reception signals of scattered light from a conical scanning sensor (1) that repeatedly emits laser light toward a wind observation region and receives scattered light of the laser light scattered by an aerosol present in the wind observation region; and a signal integration unit (32) that uses a frequency shift amount corresponding to each of a plurality of mutually different wind vectors to shift the frequency of each of the received signals acquired by the received signal acquisition unit (31), and integrates the spectrum of the plurality of frequency-shifted received signals with respect to each of the wind vectors. Furthermore, the wind observation device (3) is provided with a wind vector selection unit (33) that selects a wind vector corresponding to the wind vector in the wind observation region from the plurality of wind vectors on the basis of the spectrum of the received signals integrated by the signal integration unit (32) for each wind vector.

The present disclosure provides a satellite including a satellite body and an antenna array mounted on a face of the satellite body. The antenna array may include a plurality of antenna elements configured to produce a progressive phase shift and generate an offset beam relative to a normal of the antenna array. A control system may be configured to rotate the satellite body about an axis. The offset beam and rotation of the satellite body may produce a conical scanning pattern. The satellite may include an uneven power splitter coupled to the antenna elements and feed lines of varying lengths to generate the offset beam. The satellite body may be flat with a high surface-area-to-volume ratio and configured to maintain an aerodynamic orientation during rotation. The conical scanning pattern may enable observation of a field of view from multiple viewing angles.