35 results about "Conical scanning" patented technology

The invention 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 objective of the invention is to solve the problem of low efficiency of coaxial adjustment and error correction of a conical scanning laser radar. Comprising a base, a debugging and mounting platform, a positioning and orienting system, a radar data acquisition and control unit and a conical scanning single-photon laser radar, debugging and correction are carried out on the ground through the debugging and mounting platform, and the motion of the laser radar following a carrier can be efficiently simulated. Debugging steps after actual installation of the radar are simplified, and repeated steps in the using process are reduced; according to the invention, through the radar data acquisition and control unit with the FPGA as the core, high-time-precision control of other parts is realized, high-speed and low-time-delay data acquisition and storage of each part are realized, and introduced errors of debugging are reduced; according to the invention, by using the area array GM-APD detector, the data accumulation time of the laser radar using the GM-APD is effectively reduced, and the frame rate of the laser radar based on the GM-APD is improved.

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 utility model provides a light and small laser wind-finding radar device for an aerostat platform, and the device comprises a laser light source which is used for generating a pulse light beam with preset energy and preset frequency; the transmitting-receiving optical system comprises a step-shaped wedge mirror or a holographic optical element, is arranged on an emergent path of the pulse light beam and is used for transmitting the pulse light beam according to a forward conical scanning mode and receiving an echo signal of the pulse light beam; and the laser detector is arranged on an incident path after the echo signal passes through the transceiving optical system, and is used for detecting the echo signal to obtain the frequency shift of the echo signal.

The utility model relates to the technical field of terahertz scanning, and discloses a terahertz conical scanning device, which comprises a box body, a U-shaped frame is arranged on the top surface of the box body, an electric push rod is fixedly mounted on the top surface of the U-shaped frame, the telescopic end of the electric push rod extends into the U-shaped frame, a linear slide rail drives a slide block to move left and right, and the linear slide rail drives the slide block to move left and right. A sliding block drives a mounting column, a hinged plate and a terahertz scanning assembly to do horizontal movement, the terahertz scanning assembly scans an object in different directions, a driving motor drives a small gear and a large gear to rotate, and therefore a mounting shaft conveniently drives a connecting block and the terahertz scanning assembly to rotate left and right; according to the device, the angle of the terahertz scanning assembly can be conveniently adjusted, so that the terahertz scanning assembly can perform multi-angle scanning on an object, and the device not only can perform height and horizontal reverse adjustment on the terahertz scanning assembly, but also can perform multi-angle adjustment on the terahertz scanning assembly, so that the scanning convenience of the terahertz scanning assembly is improved.

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.

The present invention belongs to the technical fields of active microwave remote sensing, extraction of linear frequency modulation transmitted signals of scatterometers, and ocean data processing. Specifically, it relates to a method and device for extracting positive and negative slope linear frequency modulation transmitted signals of a spaceborne scatterometer. The method includes: using a spaceborne microwave scatterometer to perform conical scanning on an area to be observed within a swath through a fan beam, and obtaining in real time the scanning azimuth angle for this observed area; based on the scanning azimuth angle for this observed area obtained in real time, determining whether the antenna transmits a linear frequency modulation pulse signal with a negative slope or a linear frequency modulation pulse signal with a positive slope.

The invention provides an anti-ground clutter method for a missile-borne FMCW radar, and the method comprises the following steps: (1), enabling a missile-borne radar antenna to adopt a bias angle, and carrying out the bias of a half wave beam under a general condition, so as to enable the antenna to form conical scanning; (2) transmitting a group of continuous wave dot frequency signals by the missile-borne FMCW radar; (3) carrying out FFT (Fast Fourier Transform) processing; step (4), according to the FFT processing result and the Doppler frequency fv of the ground clutter, calculating the conical scanning frequency fa and the spectrum center frequency fv + fa or fv-fa of the clutter; and (5) distinguishing the ground clutter from the moving target on the ground in the frequency domain to achieve the purpose of suppressing the ground clutter. According to the method, the ground clutter can be accurately estimated, targeted filtering is realized, the ground clutter and the target are effectively distinguished, the ground clutter is effectively inhibited, accurate detection of the signal target is ensured, the signal processing effect is good, and a good effect is achieved in time engineering application.

The invention discloses a conical scanning angle measurement tracking method, device and system based on a spherical phased array antenna, and belongs to the technical field of antennae, and the method comprises the steps: firstly, building a conical scanning geometric model based on a spherical phased array, determining the scanning frequency, the scanning deflection angle and the scanning discrete point number, and determining a target direction; secondly, calculating a modulation coefficient, calculating a scanning point according to a target direction, and determining a phased array beam conical scanning process; then, transverse and longitudinal errors are calculated by determining the power of a phased array receiving signal and are further used for estimating the real direction of a target; and finally, estimating, predicting and tracking the real direction of the target through loop filtering. According to the invention, high-precision angle measurement tracking is realized by using high gain of the phased-array antenna and conical scanning, the array arrangement mode of the phased-array antenna is not strictly constrained, the expansion is flexible, the realization is simple, and the cost is low.

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.

The present invention discloses a four-quadrant positioning and tracking method based on conical scanning, comprising the following steps: using a laser spot with a divergence angle to actively illuminate a small moving target to be detected; using a receiving telescope and a conical scanning mirror to receive and image the target reflected light, so that the position of the target image on the four-quadrant detector is deflected; the conical scanning mirror is rotated at a uniform speed to make the target on the image plane perform uniform circular motion around the centroid of the non-deflected target image; according to the residence time length of the target spot in the four quadrants and the centroid calculation formula, the centroid coordinates of the non-deflected image target are solved. By using the present invention, the nonlinear positioning error and the requirements for the target size of the traditional four-quadrant detector can be avoided, and the large offset detection of low-speed small-scale targets or light spots can be realized, and it can be used for optical tracking under simple backgrounds such as the sky and the ocean, optical guidance or precise tracking and aiming of light spots in optical communications, etc.

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.

The invention discloses a method for reconstructing a three-dimensional structure with dynamic resolution of weather radar base data combined with terrain. The method realizes three-dimensional structure reconstruction by combining a digital elevation model (DEM) with weather radar base data. The method comprises the following steps: cutting out DEM terrain data and dumping it into grid data in binary form, generating a bitmap as a mapping source, establishing an elevation index array based on weather radar base data and an azimuth index array based on a conical scanning surface to quickly map angles, determining a rectangular reconstruction area and establishing a three-dimensional grid, traversing the three-dimensional grid to obtain elevation and azimuth angles of grid points and a distance combination array to obtain grid point data, smoothing the grid point data, resampling terrain grid data and constructing a terrain grid surface, obtaining a mapping image of the terrain grid surface, and performing three-dimensional volume rendering. The method has the advantages of not relying on online services, being able to realize dynamic high-precision three-dimensional structure reconstruction of radar echoes in a designated area while ensuring interactive performance.

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 invention discloses a method for the pointing consistency of antenna transceiver beams, which is mainly used in the Ku-band VICTS mobile communication antenna system. It is used to solve the problem that in the case where the receiving and transmitting antenna surfaces are separated, the receiving and transmitting antenna beams can be accurately pointed at the satellite, so as to maximize the communication ability of the antenna. Different from the past, this method first uses the receiving antenna to track and align with the satellite in a closed loop, and then uses the self-transmitting and self-receiving characteristics of the antenna to detect the signal level of the transmitted signal transmitted to the receiving antenna through the satellite link, indirectly realizing the closed-loop control of the transmitting antenna beam. In addition, this method adjusts the center of the beam towards the direction of the maximum signal level by means of conical scanning, overcomes the errors of each sensor and actuator, and realizes the pointing consistency of the transceiver beams.

The invention relates to a signal simulation method of a spaceborne conical scanning microwave scatterometer echo simulator, which provides single-point or multi-point target echo signal simulation based on a measured target of a spaceborne scatterometer, and comprises variable signal time delay and Doppler frequency compensation. Through echo signal simulation based on the satellite-borne conical scanning microwave scatterometer, the function and performance of the system can be effectively verified, the influence of different Doppler shifts of echo signals caused by satellite movement and earth rotation is eliminated, and the precision of the system on a wind vector inversion result subsequently is improved. Meanwhile, the signal simulation method has the advantages of being easy to implement and universal.

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 invention discloses a four-quadrant positioning and tracking method based on conical scanning. The four-quadrant positioning and tracking method comprises the following steps of: actively irradiating a to-be-detected small moving target by adopting a laser spot with a divergence angle; a receiving telescope and a conical scanning mirror are used for receiving and imaging the target reflected light, so that the target deflects at the position of a target image on the four-quadrant detector; enabling the target on the image surface to do uniform circular motion around the centroid of the non-deflection target image through uniform rotation of the conical scanning mirror; and solving a centroid coordinate of the non-deflection image target according to the residence time length of the target light spot in the four quadrants and a centroid calculation formula. According to the invention, the nonlinear positioning error of a traditional four-quadrant detector and the requirement on the target size can be avoided, the large offset detection of a low-speed small-scale target or light spot can be realized, and the method can be used for optical tracking, optical guidance or accurate tracking and pointing of light spots in optical communication under simple backgrounds such as the sky and the ocean.

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.