14 results about "Array aperture" patented technology

The invention provides a beam forming optimization method for an ISAC system based on a reconfigurable antenna structure, and the method comprises the steps: firstly, designing an energy-saving DFBS based on a TTD reconfigurable antenna architecture based on a downlink terahertz large-scale MIMO ISAC system; the DFBS is switched between the modular MIMO and the uniform MIMO by dynamically controlling the antenna sub-arrays; in the sensing stage, modular MIMO is deployed, and a larger array aperture is realized by using fewer antennas; the beam dispersion effect at the main lobe and the grating lobe is utilized to realize rapid user perception; in the communication stage, uniform MIMO is adopted, and a TTD network is activated to reduce the near-field beam dispersion effect; then, based on the channel state information obtained in the sensing stage, proposing a joint optimization problem of analog / digital hybrid beam forming and TTD network delay so as to maximize a system sum rate; finally, analog beam forming and time delay are designed through a serial time delayer method, and then alternating iteration optimization solution is carried out on digital beam forming.

The invention discloses a high signal-to-noise ratio detection system and method based on superlens array aperture synthesis, the system comprises a superlens array and a registration module, the superlens array comprises a substrate and N sub-superlenses integrated on the substrate, and the N sub-superlenses are used for forming N sub-images on a camera target surface for the same target; and the registration module is used for registering the N sub-images, and superposing the registered N sub-images frame by frame to obtain an image after aperture synthesis. According to the detection system, the signal-to-noise ratio of a target can be improved, high-resolution detection is realized, and miniaturization and integration can also be realized.

The invention relates to an off-grid compressed sensing DOA (direction of arrival) estimation method based on a rear nested array, and belongs to the technical field of array signal processing. Two uniform linear arrays are utilized to construct a rear nested array, a signal covariance matrix is constructed, an initial estimation angle is obtained, off-grid correction is performed through a first-order Taylor expansion method, and final angle estimation is realized after iteration is completed. The method has the advantages that the array aperture is expanded by using the improved rear nested array structure, the degree of freedom of the array is improved, and the direction of arrival of more incident signals can be estimated; through Taylor out-of-lattice correction, the problem that the accuracy of a compressed sensing DOA estimation method is reduced in a grid mismatch scene is successfully solved, and compared with a traditional method, the method can still keep the estimation performance of high accuracy and high success rate on the incident angle of the information source under the low signal-to-noise ratio.

The application discloses a kind of based on the construction method of frequency band overlap unit's ultra-wideband heterogeneous array aperture optimization mathematical model, include the following steps: according to unit type and operating frequency band, heterogeneous array is divided into several subarrays, unit type and operating frequency band are consistent in each subarray;Establish the heterogeneous array directional diagram expression considering the shared aperture when different frequency bands overlap;Further combined with the performance requirements of ultra-wideband, the array radiation performance constraint condition is constructed;According to each operating frequency and scanning angle range, establish the subarray element spacing constraint condition, to avoid producing grating lobe;Establish array aperture constraint condition, for limiting array total aperture size in preset range;Comprehensive above directional diagram expression and various constraint conditions, the ultra-wideband heterogeneous array aperture optimization mathematical model is constructed.The application establishes the construction method of frequency band overlap unit's ultra-wideband heterogeneous array aperture optimization mathematical model, provides theoretical model for subsequent design of ultra-wideband heterogeneous array.

The invention belongs to the technical field of near-field RIS target positioning, and particularly relates to a non-line-of-sight near-field source parameter estimation and correction method based on decoupling atom norms. According to the method, through cross-correlation operation and pseudo-snapshot processing, angle information and distance information are decoupled while the array aperture is expanded. In addition, the single-snapshot decoupling atom norm algorithm based on the virtual aperture is provided while the advantage of super-resolution performance of the atom norm under the single snapshot is reserved. And through a decoupling atom norm method, the pitch angle and the azimuth angle on the RIS are further decoupled, and the algorithm complexity is reduced. And finally, designing a total least square parameter compensation algorithm based on an accurate model so as to reduce system errors caused by Fresnel approximation.

The disclosure proposes a shaped-beam pattern sparse linear array design method. This method formulates the shaped-beam pattern synthesis of maximally sparse linear arrays as an atomic norm optimization problem. Through the sparse optimization theory based on atomic norm and the reweighting process, the number of elements can be effectively reduced. In addition, the weighted matrix is designed to ensures that the array aperture does not decrease, thereby preventing the degradation of the resolution of antenna array.

A SLM comprises emissive pixels, a parallax barrier, and a birefringent lens array. The apertures and lenses are each aligned with a respective pixel, polarisation switch, display polariser, and reflective polariser, with a switchable polar control retarder between the reflective polariser and an additional polariser. In privacy mode, pixel light transmitted by the display polariser is provided with optical power by the lens array; the parallax barrier has regions that reduce the pixel light from pixels that are not aligned with a respective lens; and the polar control retarder has a phase difference only in non-viewing directions and provides high security factor. In share mode, pixel light transmitted by the display polariser is provided with no optical power by the lens array; and the polar control retarder has no phase difference over a wide field of view and provides high image visibility. A near-eye display has increased dynamic range.

The present invention provides a high-resolution spatial spectrum direction finding method and system based on dynamic aperture adjustment, belonging to the field of communication technologies. The present invention dynamically adjusts the aperture, calculates the direction finding result under this aperture, and judges whether this direction finding result is valid according to certain criteria. If the direction finding result is valid, it stops adjusting the aperture and returns the direction finding result. If the direction finding result is invalid, it continues to adjust the aperture until the upper limit of aperture adjustment is reached. If there is no valid direction finding result even when the upper limit is reached, it returns the direction finding result of the initial aperture. The present invention solves the technical problem of insufficient direction finding resolution caused by a small array aperture corresponding to the signal frequency.

The application discloses a kind of multispectral imaging systems based on superstructured surface and the target detection method of multispectral imaging system based on superstructured surface, it is related to spectral imaging and computer vision field;It can improve spectral segmentation accuracy, improve multispectral image quality.The multispectral imaging system based on superstructured surface includes: front imaging system, array aperture diaphragm and microlens array;Form one image plane after using front imaging system to image once;Array aperture diaphragm includes multiple sub-apertures, each sub-aperture corresponds to a spectral channel, and the one image plane is divided into multiple channel images by multiple sub-apertures;Microlens array is based on superstructured surface and sub-aperture imaging, and the image passing through sub-aperture is focused to the corresponding position of detector according to spectrum, and multispectral image is obtained by detector.

The application discloses a large-scale ultra-wideband multi-frequency common aperture array high-efficiency sparse array optimization method based on interpolation theory, a mathematical model of common aperture array synthesis is established, the element position and constraint conditions of the common aperture array are uniformly described, a common aperture array position updating strategy based on interpolation theory is introduced, the element position is iteratively updated, and controllable movement of the element in a global and local range is realized; and in combination with an array optimization switching strategy, different array updates are adaptively selected in the iteration process, cooperative layout optimization between arrays is realized, and the synthesis performance can be improved with the target of reducing the peak side lobe level on the premise of meeting the array aperture, the element quantity and the minimum spacing and other constraints. Meanwhile, by combining a fast calculation method of a directional diagram, the calculation amount in the optimization iteration process is reduced, and the solution efficiency of the large-scale common aperture array synthesis is improved.

The invention discloses an ultra-wideband common-caliber heterogeneous arraying and beamforming optimization method, which adopts an array caliber sharing technology, adopts a 1-16GHz full-band pull-through design on an array element frequency band, and is planned to be recommended to be divided into two groups of arrays on an arraying interval group, so that full-band fuzziness can be avoided, and the high-gain requirement of an X-band and a higher frequency band can be met; therefore, the number of channels is comprehensively reduced, and the layout requirements of multiple functions, integration, compactness, light weight, low side lobe and high efficiency are met. According to the common-caliber array layout optimization method based on the hummingbird algorithm, the number of sub-arrays, the scale of the sub-arrays, the position of the sub-arrays and the feed phase are used as optimization variables to meet the low-sidelobe constraint condition of a wide-band wide-angle scanning large-scale array, and an algorithm schematic diagram and an algorithm overall block diagram are given. And the S wave band is optimized by using the algorithm, and the indexes that the scanning angle is + / -45 degrees and the main-to-auxiliary ratio in the S wave band is greater than or equal to 30dB are completed.

The application discloses a kind of low-frequency sound source three-dimensional passive positioning methods of deep-sea small aperture array, belong to ocean engineering, underwater acoustic engineering, array signal processing and sonar technology technical field, comprising the following steps: S1, setting small aperture array initial parameter;S2, small aperture array carries out super directivity azimuth estimation;S3, using small aperture array carries out the matching field positioning of super directivity;S4, using S2 and S3 estimation result, using small aperture array beam output result estimation target depth;The application breaks through the limitation that conventional scalar array cannot simultaneously obtain target azimuth, distance and depth information under the condition of smaller array aperture, can simultaneously obtain target azimuth and distance information with smaller aperture, and obtains target depth information according to known target azimuth and distance information, and has good azimuth estimation performance, and is convenient to lay and recover, more widely applicable, and lower cost.

The invention discloses an array aperture virtual synthesis and angle resolution improvement method. According to the invention, the second receiving array of which the array element spacing is equal to the aperture size of the first receiving array is designed, and the phase center displacement processing is carried out on the first receiving array signal based on the array element coordinates of the second receiving array, so that the equivalent large-aperture array with M * N * K * L virtual array elements is synthesized by only using M * N + K * L physical array elements; therefore, on the premise that a multi-channel orthogonal waveform does not need to be transmitted, the angular resolution of the system is greatly improved, and meanwhile, the hardware complexity, the waveform resource overhead and the engineering implementation difficulty of the radar system are remarkably reduced.

The invention discloses a processing method and processing equipment of a super-structure lens, and is suitable for the field of ultrafast laser application. Laser direct writing processing and chemical etching are carried out in combination with a non-diffraction negative Bessel beam, the hole depth and the hole diameter of the nanopore array are freely regulated and controlled, and when the non-diffraction negative Bessel beam is focused on a glass sample, the focusing position of the non-diffraction negative Bessel beam is changed by mechanically controlling the movement of the glass sample, so that the hole depth and the hole diameter of the nanopore array are adjusted. According to the method, the nano-holes with different hole depths are machined in different positions, free regulation and control of the hole depths of the nano-holes are achieved, overall regulation and control of the hole diameter of the nano-hole array are achieved by regulating and controlling chemical etching parameters, and efficient and accurate machining of the glass nano-holes with the high depth-diameter ratio is achieved by comprehensively regulating and controlling the feature sizes of the nano-holes. And moreover, the super-structure lens can have a relatively wide regulation and control range when carrying out phase regulation and control on light rays.