46results about How to "Realize 2D scanning" patented technology

The invention, which belongs to the field of the laser radar optical design system, provides a semi-coaxial optical path receiving laser radar system comprising a laser emitting module, a galvanometerscanning module and a laser receiving module. The galvanometer scanning module includes a first one-dimensional MEMS galvanometer, a second two-dimensional MEMS galvanometer and a reflective opticalelement; the scanning direction of the first one-dimensional MEMS galvanometer is perpendicular to the scanning direction of the second one-dimensional MEMS galvanometer; and the scanning mirror areaof the first one-dimensional MEMS galvanometer is smaller than that of the second one-dimensional MEMS galvanometer. The laser emitting module emits shaped pulsed laser; and the emitted laser passes through the first one-dimensional MEMS galvanometer and the second one-dimensional MEMS galvanometer to realize two-dimensional area array scanning; and a scattered echo signal is reflected by the second one-dimensional MEMS galvanometer and the reflective optical element and then returns to the laser receiving module. Therefore, a conflict problem between the echo energy and measurement accuracy is solved; the high resolution is realized in the process of testing people or objects ahead; and the authenticity of test results is guaranteed to the greatest extent.

This invention discloses a manufacturing method for a mirror scan array antenna composed of an array antenna, a mirror rotation unit and a reflection mirror, and the method applies a feeding mode of array antenna to realize wave beam scanning by rotating the reflection mirror. Advantages: compact structure, small volume, light weight, simple servo structure and low process cost.

The invention provides an optical antenna, a phased array laser radar and a two-dimensional scanning method of the optical antenna. The optical antenna comprises an SOI substrate, a waveguide structure layer, a spacer layer, an annular grating structure layer and a protection layer; a waveguide structure layer is formed on the top silicon layer of the SOI substrate; the spacer layer, the annular grating structure layer and the protection layer are sequentially arranged on the waveguide structure layer; the waveguide structure layer comprises a radiation type strip-shaped waveguide array, speckle conversion structures and a circular flat plate coupling region, wherein the radiation type strip-shaped waveguide array is connected with the circular flat plate coupling region through the speckle conversion structures; the difference value of the refractive index of the annular grating structure layer and the refractive index of the spacer layer and the difference value of the refractive index of the annular grating structure layer and the refractive index of the protection layer are both greater than a preset threshold; and the refractive index of the annular grating structure layer ishigher than the refractive indexes of the spacer layer and the protection layer. Light waves can be successfully emitted upwards and inhibited from being emitted downwards, so that high radiation efficiency is obtained; the radiation type strip-shaped waveguide array can be divided into multiple groups; and the light of the strip-shaped waveguide groups in different directions work in a time-division manner, so that two-dimensional scanning can be realized.

The invention discloses a two-dimensional scanning varactor active super-surface electromagnetic lens antenna, which comprises a focusing lens, a two-dimensional scanning array, gaskets, a support column, a horn antenna and a base. The focusing lens is a super-surface electromagnetic lens. The two-dimensional scanning array, the focusing lens and the support column are connected by the gaskets inturn. The two-dimensional scanning array is formed by superimposing two one-dimensional scanning arrays: an x-direction scanning array and a y-direction scanning array, wherein the y direction is usedas the polarization direction, the z direction is used as the axis-of-symmetry direction of the lens, and the bias lines of the varistors in the two one-dimensional scanning arrays are in the x direction. The antenna realizes two-dimensional scanning by changing the bias voltages of the varactors. The scanning array realizes two-dimensional scanning through the one-dimensional scanning arrays realized by two groups of varactor active super-surfaces, the scanning directions of the two arrays are orthogonal, and the two arrays are longitudinally superimposed. By using the method, the complexityand cost of super-surfaces in a large-scale two-dimensional scanning array can be reduced. Meanwhile, the focusing lens is realized by a super-surface, and the longitudinal size is reduced.

The invention discloses an MIMO communication system based on an irregular spliced sub-array architecture, which can be used for full-digital beam forming and hybrid digital beam forming. Each radio frequency link is connected with two adjacent antenna units through one power divider, so that the number of the radio frequency links can be greatly reduced. In the design process, firstly, irregularsub-array arrangement is optimized by taking MIMO channel capacity as an optimization target, and after an optimal array topological structure is obtained, precoding and decoding vectors are designedby taking spectral efficiency maximization as a target. The most innovation of the invention lies in that under the condition that the number of the radio frequency links is not changed, the irregularsubarray architecture improves the MIMO channel capacity by increasing the aperture area of the antenna array, and finally, the spectral efficiency is improved.

The invention provides a liquid crystal polymer polarization grating and a preparation method and application thereof, and particularly relates to a liquid crystal polymer polarization grating and a preparation method thereof, combination cascade of the liquid crystal polymer polarization grating and application thereof in two-dimensional optical scanning, and optical phased array radar comprisingcombination cascade and application thereof. The liquid crystal polymer polarization grating comprises a light-operated orientation film and a liquid crystal polymer film arranged on one side of thelight-operated orientation film. The molecular director direction of the light-operated orientation film is in periodic gradual change distribution; the director distribution of a layer of liquid crystal molecules, close to the photo-alignment film, in the liquid crystal polymer film is the same as that of molecules of the photo-alignment film; the liquid crystal polymer polarization grating has asmall area and a high integration degree, and the prepared optical phased array radar has the advantages of being small in size, low in cost, high in response speed, simple in control process and thelike.

The invention relates to the technical field of laser radar equipment, and discloses a 3D laser radar and a foot type robot. The 3D laser radar provided by the invention comprises a vertical scanning unit and a horizontal rotating device; the vertical scanning unit comprises a mounting base, and a laser receiving electrode, a convex lens, a laser emitting electrode and a reflecting body which are sequentially arranged on the mounting base; the laser receiving electrode is arranged at the focus position of the convex lens, the laser emitting electrode is arranged on the main optical axis of the convex lens, and the reflecting body is rotatably arranged on the mounting base; the rotation center of the reflector coincides with the main optical axis of the convex lens; and a laser pulse signal realizes environment scanning in a vertical plane through rotation of the reflector, and further realizes scanning of a three-dimensional environment through the horizontal rotating device. Two-dimensional scanning in a vertical plane in the environment is achieved through the vertical scanning unit, the vertical scanning unit is rotated in the horizontal direction through the horizontal rotating device, and three-dimensional scanning of the surrounding environment is achieved.

The invention provides a stable imaging method applicable to two-dimensional wide-area scanning. The core of the method is geographical stabilization and electron image movement compensation matching, forward movement of a photoelectric system is compensated in a geographical stabilization manner, the movement of the azimuth is compensated in a geographical stabilization and electron image movement combined manner, and clear imaging of the photoelectric system in the two-dimensional wide-area scanning process is finally realized. The method is mainly realized through algorithms, the structural form is simple, the imaging quality of the photoelectric system can be effectively improved, and the reliability of the photoelectric system can be improved.

The invention provides a space lens scanning antenna based on elliptical paraboloid of revolution phase distribution and a beam scanning method thereof. During beam scanning, the phase error of the space lens scanning antenna is unchanged along with the increase of a scanning angle, so that the gain is slowly reduced and the space lens scanning antenna is far superior to a lens antenna designed bythe traditional aplanatism principle; the structure is simple, the processing is convenient, and the device can be used for various frequency bands such as microwave, millimeter wave, terahertz and the like; complex active components and a feed network are not needed, complex lens design is avoided, system complexity is greatly reduced, and design flexibility is improved; the manufacturing cost is low, the power consumption is low, a special heat dissipation structure is not needed, and therefore the cost and the complexity are far lower than those of a phased array, a Lunberg lens and a complex network multi-beam antenna.

The invention relates to the technical field of automation identification, and provides an antenna system applied to three-dimensional scanning of a radar. The antenna system comprises antenna units, control switches, feed ports and a switch control system. The antenna units form an m*n antenna array. The control switches are arranged between the antenna units and used for being connected with the antenna units to form the m*n antenna array. The feed ports are connected with the antenna units at the tail ends of m rows and the tail ends of n lines. The switch control system controls the control switches to achieve two-dimensional scanning in the row direction and the line direction of an antenna beam. According to the antenna system, as the radio frequency switches are arranged between the antenna units, the switch control system controls the states of the radio frequency switches to achieve two-dimensional scanning in the row direction and the line direction of the antenna beam, and the three-dimensional scanning requirement of the radar is met.

The invention provides a laser radar measurement method and a laser radar system. The laser radar measurement method comprises the steps of generating an output optical signal with a tunable wavelength through a tunable laser generation unit; performing linear frequency modulation on the output optical signal to obtain a frequency-modulated continuous wave signal; splitting the frequency-modulated continuous wave signal to obtain an emergent light signal and a local oscillation light signal; carrying out power amplification on the emergent light signal and then emitting the emergent light signal by an optical phased array emission unit, and carrying out two-dimensional scanning on a target object; and receiving an echo light signal reflected by the target object, and obtaining distance and/or speed information of the target object according to the echo light signal and the local oscillation light signal. Tunable laser and an optical phased array system are combined, two-dimensional scanning is achieved on the basis of a one-dimensional optical phased array device, and the situation that the one-dimensional optical phased array device achieves two-dimensional scanning in a stacking mode is avoided; by adopting an external modulation mode, the optical phased array and the broadband tunable laser are reasonably combined with a frequency modulation continuous wave system, and the defect that narrowband linear frequency modulation of the broadband tunable laser is difficult is overcome.

The invention discloses a phased array arrangement optimization method based on irregular subarrays. A mixed integer linear programming model is provided. Meanwhile, the gain and sidelobe level duringarray scanning are considered, solving is conducted through a commercial solver to achieve the high gain and low sidelobe characteristics during irregular array scanning, and after array arrangementis optimized, a needed directional diagram is synthesized with the maximum gain as the principle through a convex optimization algorithm.

The invention discloses a phased array arrangement optimization method based on irregular subarrays. According to the method, the definition of array information entropy is fully utilized, and the array information entropy is applied to an irregular phased array based on a four-network grid form; and an optimization model is linearized by adding variables, so that an original problem can be solvedby a commercial solve; after array arrangement is optimized, a directional diagram of a required scanning angle is synthesized through a convex optimization algorithm. The method is most ingenious inthat the essential characteristics of the original optimization problem are mined; the convex optimization algorithm is adopted for optimization; and therefore, calculation time is greatly saved, anda super-large-angle scanning characteristic is guaranteed while only one fourth of the number of T/R components of an original array is used.

The invention discloses an N-line laser radar scanning system and method. The scanning system comprises a laser light source and a two-dimensional scanning subsystem; the two-dimensional scanning subsystem comprises an optical switch, a collimating lens and a reflector; the output end of the laser light source is connected with the input end of the optical switch, the output end of the optical switch is connected with one side of the collimating lens, and a reflector is arranged on the other side of the collimating lens. The structure of a conventional laser radar scanning system is simplified, the manufacturing cost of multi-line laser radar is greatly reduced, the maintenance process is simple and convenient, and a thought is provided for popularization of the high-performance multi-line laser radar.

The invention relates to laser radar scanning, in particular to a laser three-dimensional imaging scanning method based on dielectric elastomer driving, and belongs to the field of optical design. A dielectric elastomer is used as a drive, and the two-dimensional scanning of a light beam is realized by using the radial eccentric movement principle of a lens. The movable lens driven by the dielectric elastomer is adhered to the midpoint area of the dielectric elastomer. Four areas are evenly distributed on the peripheral area of the movable lens driven by the dielectric elastomer, the upper surface of the dielectric elastomer in each area is evenly coated with a flexible electrode, and the lower surface of the dielectric elastomer in each area is evenly coated with a ground electrode. The movable lens driven by the dielectric elastomer can generate radial eccentric movement by adjusting voltage combination applied to the four electrodes, and parallel light beams are emitted in a direction having a deflection angle with the optical axis instead of being emitted at an angle parallel to the optical axis after passing through the movable lens driven by the dielectric elastomer and a second lens.Therefore, the scanning of a target is realized.

The invention provides a hand-hold near-field imaging device and a scan imaging method thereof. The hand-hold near-field imaging device in the invention comprises a radiometer, a rotatable radiation guide device and a rotation drive device, wherein the radiometer is used for metering incident radiant quantity thereon; the rotatable radiation guide device is used for guiding radiations emitted by each point of a target object in a specific direction to the radiometer one by one; the rotation drive device is used for driving the radiation guide device to rotate; and the one-dimensional image ofthe target object in the specific direction can be obtained according to the radiant quantity metered by the radiometer.