43results about How to "Solving Phase Blur Problems" patented technology

The invention introduces a microwave device impedance measurement calibration method. The method comprises the following steps: (1), calculating time-delay transmission line transmission parameters through real-time measured data of straight-through calibration member scattering parameters and time-delay calibration member scattering parameters; (2), embedding a newly added virtual transmission line in an original time-delay calibration member, and calculating the transmission parameters of a virtual time-delay calibration member; (3), according to a conventional TRL calibration method, extracting calibration coefficients of a measuring clamp, and performing matrix inversion and multiplication operation to obtain a microwave device de-embedding transmission parameters; and (4), performing impedance normalization transformation on the microwave device de-embedding transmission parameters to obtain normalized microwave device normalization scattering parameters relative to system measurement reference impedance. The method makes up the measurement errors caused by inconsistence of transmission line characteristic impedance and the system measurement reference impedance, and realizes microwave device impedance measurement with an ultra wide band and high precision. At the same time, the improved microwave device impedance measurement calibration method can substantially reduce design processing requirements of a calibration device, thereby having high versatility.

The invention belongs to the technical field of surface topography measurement, and discloses a method and a device for fluorescence interference microscopic measurement based on stimulated radiation. The method includes: firstly, coating surfaces of a measured piece and a reference mirror; secondly, subjecting the measured piece and the reference mirror to stimulation of monochrome detection laser; and finally, resolving interference fringes on a detection surface. The device a laser device, a converging objective lens, a first pinhole, a collimation and beam expanding objective lens, a beam splitting prism, a reference focusing objective lens, the reference mirror, a displacement driver, a detection focusing objective lens, the measured piece, an imaging converging objective lens, a narrow-band filter, a second pinhole and a detector, wherein the converging objective lens, the first pinhole, the collimation and beam expanding objective lens, the beam splitting prism, the reference focusing objective lens, the reference mirror and the displacement driver are disposed on a direct light path of the laser device along a light transmitting direction, the detection focusing objective lens and the measured piece are disposed on a reflected light path of the beam splitting prism, and the imaging converging objective lens, the narrow-band filter, the second pinhole and the detector are disposed on a transmission light path of the beam splitting prism. By the design that surfaces of the measured piece and the reference mirror are coated by the aid of a vacuum evaporation coating method, measurement light is guaranteed to be capable of returning to a detection system after being reflected by a measured surface, high-NA(numerical aperture) and high-slope surface detection is achieved, and the device is applicable to ultra-precise measurement of three-dimensional topographies of high-NA and high-slope spherical surfaces, aspheric surfaces and free-form surfaces.

The invention discloses a laser white light compound interference measuring device and method. Monochromatic light phase shift interference can be combined with white light scanning interference to improve the measurement performances of the system. The measurement device comprises a white LED light source, a collimating lens, a filter, an optical microscopic interference module and an image acquisition device. The measurement method comprises the steps of: performing white light scanning interferometry of a measured sample; performing monochromatic light phase shift interferometry, wherein itis only needed to put the filter at front of a beam splitter mirror, and other portions are the same as the white light scanning interference; and combining a white light scanning interferometry andthe monochromatic light phase shift interferometry to solve the phase fuzzy problem in the monochromatic light phase shift interference. Compared to the white light canning interference, a compound interferometry result is higher in precision. Besides, the system provided by the invention employs an Michelson interference structure, the transverse measurement range is far larger than the measurement range of a commerce white light interference Mirau structure, and therefore, the laser white light compound interference measuring device and method has bigger advantage for large-size part surfacedetection.

The invention proposes a radar object positioning method based on machine learning. According to one embodiment of the invention, the method comprises the steps: carrying out the range-direction pulse compression of a target echo signal received by an along-track two-channel SAR (synthetic aperture radar), obtaining an interference phase matrix, sequentially inputting the interference phase vectors corresponding to all distance units in the interference phase matrix into a neural network, and obtaining a result of judgment whether each distance unit has a moving object or not and the orientation position x0 of the moving object. According to the embodiment of the invention, the method avoids problems of complex orientation pulse compression, radial speed estimation and faced phase fuzziness of a conventional ATI (along-track interference) method, thereby solving a problem that the positioning precision of the moving object is decreased because of error accumulation in the above process. The method is higher in positioning precision of the moving object, is lower in time consumption, and can meet the demands of high instantaneity and high positioning precision.

The invention provides a radar angle and distance estimation method based on tensor high-order singular value decomposition, and the method comprises the following steps: constructing an MIMO radar receiving array comprising k subarrays, obtaining the receiving data of a target echo through the MIMO radar receiving array, and constructing a third-order tensor signal model; decomposing the three-order tensor signal model by adopting a high-order singular value to obtain tensor-based signal subspaces; extracting a receiving matrix of the signal subspace to realize MIMO radar target DOA parameter estimation; and extracting a signal subspace and an emission matrix corresponding to each subarray, eliminating the phase ambiguity problem caused by the coupling of the target DOD parameter and the distance, achieving the automatic pairing of the target DOD and the distance with the DOA parameter, and finally achieving the estimation of the target DOD parameter and the distance parameter of the MIMO radar.

The invention discloses a single-equipment Wi-Fi indoor multi-user positioning method based on principle of a phased array. The method mainly includes two parts of angle measurement and distance measurement; in an indoor environment, an antenna array is deployed, and then angle measurement is carried out with the idea of the phased array; and by means of scanning from coarse granularity to fine granularity, scanning time is reduced; by means of an equi-signal method, the precision of angle measurement is increased. By means of the steps, angles of all the targets can be acquired; and finally distance measurement to the targets is carried out via a multiple-frequency method, and the angle information and distance information are combined to complete the multi-user positioning.

The invention provides a radio frequency direction finding method. The method comprises the following steps of, for an N-element uniform circular array antenna, obtaining a voltage phase difference between each path of antenna and a first path of antenna through a phase discriminator; recording each phase difference as an initial phase difference when an incoming wave enters the circular array antenna at an elevation angle of 0 degree; constructing a complex number corresponding to each antenna according to the voltage phase difference and the initial phase difference; calculating a theoretical phase difference between each antenna and the first antenna according to the elevation angle and the azimuth angle; introducing a vector X and a direction vector G, calculating the difference between the iteration times k+1 and a two-dimensional incident angle of the iteration times k by combining the elevation angle and the azimuth angle of the two-dimensional incident angle of the iteration times k+1 calculated by the constructed complex number, comparing at a threshold value, and entering an output elevation angle and an azimuth angle when the difference is smaller than the threshold value; otherwise, adding 1 to the value of k, and calculating the theoretical phase difference again. The method is advantaged in that complex operation is adopted, a phase ambiguity problem is avoided, direction finding precision is improved, and an iterative algorithm is adopted so that operations such as logic judgment are avoided.

The invention discloses a single-device WiFi indoor human body height detection method based on a phased array principle. The single-device WiFi indoor human body height detection method mainly comprises an angle measurement part and a distance measurement part. According to the technical scheme, in the indoor environment, an antenna array is deployed, angle measurement is conducted by means of the idea of a phased array, scanning time is shortened by means of scanning from coarse granularity to fine granularity, angle measurement precision is improved by means of an equal signal method, and the angles of different parts of the body can be obtained through the steps; and then distance measurement is performed on different body parts by using a multi-frequency method, and angle information and distance information are combined to obtain a body trunk heat map, so that the purpose of height detection is achieved.