140 results about "Line array" patented technology

The invention belongs to the technical field of underwater target radiation noise measurement, and particularly relates to a sparse combination array measurement system and method for underwater target radiation noise measurement, a program and a storage medium. A sparse combined array formed by a sound pressure spiral double-cone volume array with a sparse structure and a sound pressure vector nested vertical linear array is designed, a combined array frequency-division testing scheme of a high-frequency volume array and a low-frequency vertical linear array is adopted, a combined measurement method of a sound pressure hydrophone and a vector hydrophone is utilized, a measurement frequency band is extended, and the measurement precision is improved. And effective measurement of the full-band radiation noise of the underwater target is realized. Through a sparse array arrangement structure and an improved constant-beam-width beam forming method, a two-dimensional steady constant-beam-width beam is obtained while the number of array elements is reduced and the array complexity is reduced, and an appropriate main lobe width and a lower side lobe level can be adjusted according to a measured target and a measurement distance. According to the method, the array element redundancy of the measurement array is reduced, and the method can be flexibly applied to various application scenes of underwater radiation noise measurement.

A method is provided to measure the complex sensitivity of hydrophone data channels across a range of frequencies by using a water-filled tank with proximate boundaries. A hydrophone array and reference hydrophone are helically affixed to a test fixture resting on a rotation platform. When the test fixture is submerged in the tank; the platform rotates about a contour of the platform in intervals for a predetermined time interval before indexing to the next angle. Signals transmitted by an acoustic projector in the tank are received on the hydrophones of the line array and the calibrated reference hydrophone. Electrical signals from the reference hydrophone are transmitted over an electrical cable and received by the acoustic data processor for use in calibrating the hydrophone line array. Electrical signals from the hydrophones of the hydrophone line array are also transmitted to the data processor.

The invention provides a method and system for carrying out DOA estimation by using an antenna array in a partition mode, and the method comprises the steps: 1, dividing the whole antenna array into a plurality of sub-arrays, and enabling each sub-array to independently receive a signal; 2, each sub-array independently collects the received signals, and corresponding filtering and noise reduction preprocessing is carried out; 3, performing independent direction estimation on the signal of each sub-array by using a MUSIC algorithm to obtain a plurality of preliminary DOA values; and step 4, performing comprehensive processing on the DOA preliminary estimation result of each sub-array through a weighted average or joint optimization fusion algorithm to obtain a final DOA estimation value. According to the method, through partition use of the antenna array, the calculation amount of angle estimation of the antenna array can be effectively reduced, so that the real-time performance of DOA estimation is improved, and the positioning precision and the anti-interference capability can be improved by fusing estimation results of a plurality of sub-arrays.

The invention relates to a deep-sea shadow region target rapid orientation estimation method, which comprises the following steps: firstly, performing orientation estimation on a target signal received by a large-aperture horizontal line array by using conventional beam forming, and assuming that a sound source distance is estimated by an existing signal processing method; secondly, on the basis of the virtual source theory, the arrival pitch angles of four primary seabed reflection sound ray paths in the shadow area are calculated; based on the representation relation among the sound ray arrival pitch angle, the target physical orientation and the orientation estimation value, the target orientation estimation result is corrected, then the real orientation of the target is obtained, and the direction finding precision of the deep-sea shadow region target is improved.

The invention discloses a sound source direction finding method and device based on a horizontal line array. The method comprises the following steps: obtaining a time domain sound pressure signal of a target sound source through a horizontal line array; converting the time domain sound pressure signal into a frequency domain to obtain a frequency domain sound pressure signal of the target sound source; performing beam forming through the frequency domain sound pressure signal to obtain a spatial spectrum of the target sound source; and performing diffraction analysis on the spatial spectrum to obtain an azimuth angle of the target sound source relative to the horizontal line array. According to the method, distance information of the target sound source is not needed, surface waveguide leakage signals are utilized, the azimuth angle of the target sound source is accurately estimated through diffraction analysis, good direction finding stability and accuracy are achieved, and the method is particularly suitable for the deep sea environment with surface waveguides.

A large-scale antenna array absolute power calibration method is characterized in that a standard gain antenna is installed at an unoccupied position of an antenna array surface, a group of electronic switch matrixes are installed between the standard gain antenna and an antenna array radio frequency feed channel, and a tuner for receiving signals is in a form that four loudspeakers are perpendicular to each other. A wide-frequency-band horn antenna covering the working frequency band of the system is additionally arranged at the central position of a tuner of system calibration equipment; the calibration equipment computer gates the wide-band horn antenna by controlling the electronic switch, receives signals radiated to the inherent antenna of the antenna array and the additionally installed standard gain antenna respectively, and analyzes and calculates the absolute power of the system through a comparison method; the method does not need to frequently replace and erect standard antennas to calibrate the absolute power, greatly improves the calibration efficiency of the absolute power of the large antenna array, reduces errors caused by manual replacement of the fixed standard antennas, and effectively improves the test efficiency.

The antenna structure comprises a shell, an antenna array and a plurality of connectors, a plurality of fixing grooves are formed in the shell, the antenna array comprises a plurality of antenna array elements, the antenna array elements are fixed in the fixing grooves, and the connectors are connected to the shell and electrically connected with the antenna array elements respectively. According to the antenna structure, the antenna array elements of the antenna array are positioned and fixed through the fixing grooves, and the assembly and maintenance efficiency is high.

The invention relates to the technical field of partial discharge detection, and discloses a non-contact partial discharge acquisition system, which comprises a structure installation calibration module used for acquiring confocal coaxial acquisition head and slot linear array structure parameters and determining an axial reachable distance interval; the time reference calibration module is used for performing time synchronization correction on each channel to obtain a corrected timestamp; the synchronous acquisition and preliminary screening module is used for synchronously acquiring acoustoelectric signals and generating candidate events; the time delay screening module is used for calculating observation time difference and screening consistent passing events; the linear array consistency module is used for judging a linear array consistency event based on the timestamp difference value; the micro-movement rechecking confirmation module is used for collecting and comparing observation time differences before and after micro-movement and confirming a real event; and the positioning result generation module is used for determining an event positioning area by combining the axial and linear array information. According to the invention, high-precision non-contact acquisition of the partial discharge event is realized.

The application belongs to the technical field of fixed line array and specifically relates to a seabed array structure of a fixed line array, mainly comprising a weight, a floating ball, a line array, a steel wire rope, a strong rope, a metal harper, a nylon harper and a cable, the two ends of the steel wire rope are respectively fixedly provided with the weight, the line array is arranged on one side of the steel wire rope, the nylon harpers are installed on the line array at equal intervals along the length direction of the line array, one strong rope is connected to each of the nylon harpers, the nylon harpers are connected to the metal harpers through one end of the strong rope, the metal harpers are installed on the steel wire rope at equal intervals, the two ends of the line array are respectively connected with one floating ball through the strong rope, and the two ends of the line array are fixed on the weights at the two ends of the steel wire rope through the strong rope arranged in a cable-stayed mode. The application realizes all-around collection of acoustic signals, limits the distortion of the fixed line array caused by ocean current disturbance, reduces the stress of the line array during the laying process, and makes the array laying safer and more effective.

The embodiment of the present application provides a sparse linear array design method and device. The method includes: first, determining multiple performance indicators of the sparse linear array to be designed, the multiple performance indicators including the upper limit of aperture, the lower limit of aperture, etc.; then, based on the multiple performance indicators, establishing a gridless sparse optimization model based on sidelobe control, and determining the optimized constant diagonal matrix through the gridless sparse optimization model; then, based on the constant diagonal matrix, using the root-finding multi-signal classification Root‑MUSIC algorithm to estimate the frequency of the atoms, and processing the frequency by the least squares method to obtain the weight of the atoms; then, based on a pre-established mapping relationship, converting the frequency and weight into the array element position and excitation of the designed sparse linear array. In this way, the grid mismatch problem existing in the traditional method is overcome by introducing the gridless sparse optimization method, and the constraint term of the array aperture is added, so that the array element position of the sparse linear array falls within the aperture.

The utility model discloses a novel linear array sound box, which comprises a paint-sprayed wooden box, a loudspeaker system formed by combining a woofer and a treble horn is arranged in the paint-sprayed wooden box, a front full-iron mesh enclosure is arranged at the front end of the paint-sprayed wooden box, side full-iron mesh enclosures are arranged on two sides of the paint-sprayed wooden box, and the front full-iron mesh enclosure and the side full-iron mesh enclosures are arranged in the paint-sprayed wooden box. The front full-iron mesh enclosure and the side full-iron mesh enclosure are made of high-strength metal materials, front hanging supports are arranged on the two sides of the front end of the paint spraying wooden box, rear angle supports are arranged on the two sides of the rear end of the paint spraying wooden box, and the front hanging supports and the rear angle supports have the multi-angle adjusting function. According to the novel linear array sound box, the design of the front hanging bracket and the rear angle bracket is improved, the fixing and angle adjusting capabilities of the sound box are enhanced, and the front part and the side surfaces of the sound box are comprehensively protected by adopting the full-iron mesh enclosure, so that the protection performance and the heat dissipation efficiency are improved, and the stability and the durability of the sound box in various application scenes are ensured.

A system for testing a device under test, DUT, comprises a holder configured to hold the DUT, wherein the DUT comprises at least one reconfigurable intelligent surface, RIS. A first antenna array generates plane waves at a position of the at least one RIS when the DUT is arranged on the holder. The first antenna array can generate plane waves having different angles of incidence at the position of the at least one RIS. A second antenna array receives a reflection signal originating from a reflection of a plane wave, wherein the plane wave is generated by the first antenna array and is reflected from the at least one RIS. A determination unit determines an angle of incidence on the second antenna array, using the received reflection signal.

The utility model relates to the field of sound boxes, in particular to a hoisting structure of a linear array sound box, which is characterized by comprising a hoisting piece, a containing groove is arranged on the top surface of the hoisting piece, an elastic hoisting arm capable of automatically popping up a hoisting end upwards is embedded in the containing groove, a positioning bolt is inserted on the side wall of the hoisting piece, and the positioning bolt is inserted in the containing groove. And the positioning bolt can be inserted into the elastic lifting arm to prevent the lifting end of the elastic lifting arm from upwards popping out of the accommodating groove, and the positioning bolt can be pulled to be separated from the elastic lifting arm. The lifting structure of the linear array loudspeaker box not only can be conveniently operated by one splicing person, but also can enable the splicing process to be very simple and convenient, can be beneficial to reducing the splicing cost, improving the splicing convenience and improving the splicing efficiency, and has very high reliability and applicability.

An antenna array, comprising a first sub-array, a second sub-array, a first feed structure, a second feed structure, a third feed structure, and a fourth feed structure; the first sub-array comprises a plurality of first elements, and the second sub-array comprises a plurality of second elements; the feed direction of the first feed structure and the feed direction of the third feed structure are the same, and are different from the feed direction of the second feed structure, and the feed direction of the second feed structure and the feed direction of the fourth feed structure are the same; first feed points of some first elements are connected to the feed structure, second feed points of the first elements are connected to the second feed structure, first feed points of the remaining first elements are connected to the third feed structure and second feed points of the remaining first elements are connected to the fourth feed structure; third feed points of some second elements are connected to the third feed structure, the second feed points of the second elements are connected to the fourth feed structure, third feed points of the remaining second elements are connected to the first feed structure, and fourth feed points of the remaining second elements are connected to the second feed structure.

The present invention discloses a lake test method for acoustic compatibility of a bulbous bow hydroacoustic device with a towed linear array, which belongs to the technical field of ship acoustic compatibility design. The method of the present invention constructs a lake test environment, then formulates the emission conditions of the bulbous bow hydroacoustic device, and judges whether the front-end receiving channel of the towed linear array is saturated based on the data collected by the standard hydrophone, and finally judges whether the detection performance of the towed linear array is interfered based on the array element domain data. The method of the present invention can be used for the situation where the front-end receiving channel of the towed linear array has been encapsulated in a sheath and the front-end receiving channel cannot set a measuring point. In the design stage, the bulbous bow hydroacoustic device and the towed linear array are used to carry out an acoustic compatibility lake test, find out the acoustic interference of the bulbous bow hydroacoustic device to the towed linear array, support the analysis of the interference cause, and put forward targeted anti-interference measures to maximize the compatible use of the two devices.

The utility model belongs to the technical field of passive linear array sound boxes, and particularly relates to a passive linear array sound box convenient for rapid hanging, which comprises a sound box, the upper end of the sound box is fixedly connected with a mounting rack, the upper end of the mounting rack is in contact with a mounting plate, the interior of the mounting rack is in sliding connection with a sliding block, and the sliding block is in sliding connection with the mounting plate. A clamping block is fixedly connected to the upper end of the sliding block, a clamping groove is formed in the mounting plate, a threaded rod is rotationally connected to the interior of the mounting frame, a rotary knob is fixedly connected to the end, away from the mounting frame, of the threaded rod, and the rotary knob is rotationally connected with the mounting frame. According to the utility model, through the arrangement of the threaded rod, the sliding block, the clamping block and other components, the threaded rod and the sliding block can generate threaded motion by rotating the threaded rod, so that the sliding block drives the clamping block to be clamped with the mounting plate, the sound box can be mounted on the mounting plate, and the problems that the passive linear array sound box needs to work aloft when being hung and is inconvenient to mount are solved.

The invention discloses a multi-subarray combined linear array sonar array element position calibration method, belongs to the technical field of array sonar detection, and can be applied to digital calibration of all array element positions of a multi-subarray combined linear array sonar. According to the method, single-frequency signals are transmitted in a far field, self-adaptive phase difference estimation is carried out on the collected signals, the distance between adjacent array elements of adjacent sub-arrays is calculated, and therefore accurate estimation of the positions of all the array elements is achieved. Compared with a traditional mode, the method is higher in array element position estimation precision, and the detection capability and the direction finding precision of a subsequent sonar system can be effectively improved.

1. The name of this design product: Handle (Line Array Speaker). 2. Purpose of this design product: Used to install a professional stage line array speaker as a handle and shape on both sides. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the design points: Stereoscopic drawing 1.

The present invention provides a device positioning method and earphones, wherein the earphones are provided with a microphone array and a Bluetooth antenna array, the device to be positioned has a Bluetooth address and plays a preset prompt tone in an anti-lost state, and the method comprises: determining the current state of the device to be positioned, and when the device to be positioned is in an anti-lost state, using the microphone array to pick up a sound signal, and when a preset prompt tone is detected from the sound signal, performing sound source orientation on the picked up sound signal to determine the sound source orientation result of the device to be positioned; performing Bluetooth positioning on the device to be positioned using the Bluetooth antenna array to determine the Bluetooth positioning result of the device to be positioned; and performing direction determination based on the Bluetooth positioning result and the sound source orientation result to determine the real-time position of the device to be positioned. Using the above method, the sound direction finding result and the Bluetooth direction finding result can be integrated, and the reliability is higher. Moreover, the sound direction finding is performed only when the preset prompt tone is recognized, which can save resources and avoid the interference of environmental noise.

A control device (50) for an electronically swiveling antenna array (100) is disclosed. The antenna array (100) comprises several adjacent sub-apertures (110, 120, ...) each with a plurality of antenna elements (111, 112, 121, 122, ...). Each sub-aperture (110, 120, ...) is configured to generate a swiveling antenna cone (210, 220, ...). The control device (50) is configured to selectively control the following modes: a first mode (M1) in which at least two antenna cones (210, 220) from at least two sub-apertures (110, 120) overlap; a second mode (M2) in which two antenna cones (210, 220) of at least two sub-apertures (110, 120) are arranged adjacent to each other to form a fan of antenna cones (110, 120); and a third mode (M3) in which at least one of the antenna cones (110, 120) is pivoted, while another of the antenna cones (110, 120) remains directionally fixed.

The utility model relates to the technical field of sound boxes, in particular to a linear array sound box, which comprises at least one full-frequency sound box, a power amplifier module and a bass sound box which are superposed from top to bottom, and the power amplifier module is electrically connected with the full-frequency sound box and the bass sound box respectively; a plurality of low pitch units and a plurality of high pitch units are arranged in the full-frequency sound box, a compression driver is also arranged in the full-frequency sound box, and the thickness d of the full-frequency sound box meets the following conditions: 0 lt; dlt; and presetting a thickness threshold value. According to the linear array loudspeaker box of the scheme, the full-frequency loudspeaker boxes and the bass loudspeaker boxes are overlapped, so that high-pitch and low-pitch linear arrays with different heights are formed, and the sound quality of different frequency bands can be more fully displayed. Meanwhile, the thickness of the full-frequency sound box is small, the compression driver is arranged in the full-frequency sound box, it is guaranteed that the full-frequency sound box has enough medium-high frequency sound pressure levels while the size is reduced, the maximum peak sound pressure level of a high-pitch part can achieve 136dB SPL, the installation time of the linear array sound box is saved, and the transportation cost is reduced.

The utility model discloses an integrated low-sound baffle sound box. The integrated low-sound baffle sound box comprises an upper sound box and a lower sound box, the upper sound box comprises an upper bottom plate, the lower sound box comprises a lower top plate, and the upper bottom plate and the lower top plate are integrally formed. The upper sound box further comprises an upper front baffle plate, an upper front back plate and an upper rear baffle plate, the upper front baffle plate and the upper front back plate are fixedly connected and form an upper sound box accommodating space for simultaneously accommodating a plurality of alto loudspeakers and a plurality of high-pitch loudspeakers, the alto loudspeakers are respectively embedded in the upper front baffle plate, and the high-pitch loudspeakers are respectively embedded in the upper front baffle plate or the upper rear baffle plate; and a gap is formed between the upper front back plate and the upper rear baffle plate. The integrated low-sound baffle sound box disclosed by the utility model has the beneficial effects that the baffle, the linear array and the high, medium and low-sound loudspeakers are seamlessly coupled together by adopting the high-integration box body, so that a sound field effect approximate to 360 degrees is formed.

The application discloses a kind of based on tight coupling array's ultra-wideband single pulse antenna and its radiation method, including first truncation, first tight coupling line array, second truncation, second tight coupling line array, third truncation, upper layer feed network and lower layer feed network, first truncation, first tight coupling line array, second truncation, second tight coupling line array and third truncation are sequentially connected from left to right, and its lower end is fixedly connected with lower layer feed network by passing through the fourth plug hole on upper layer feed network;Upper layer feed network and lower layer feed network are coupled connection, and lower layer feed network is electrically connected between first truncation, first tight coupling line array, second truncation, second tight coupling line array and third truncation;By exciting the first port of first feed network, and wave beam in xoz plane is generated;By exciting the second port of second feed network, difference wave beam in xoz plane is generated.The application has the advantages of compact structure, low profile and wide bandwidth, and can be used in ultra-wideband single pulse tracking system.

Loudspeaker systems having improved robotic support and communication systems are described. The systems include improved mechanical actuation systems for adjusting a line-array of speakers enabling reduced weight and simpler designs for a given output. The systems further include improved identification systems that enable randomly connected speakers to be identified and ordered for adjustment.

The embodiment of the present invention relates to the field of antenna technology, and discloses an array antenna, a sparse rectangular array, and an antenna design method. In the embodiment of the present invention, a sparse array antenna is disclosed, and the sparse array antenna includes at least one array element; the numerical range of the first ratio is a set of positive integers less than the second ratio, wherein the first ratio is the ratio of the distance difference between any two array elements in the sparse array antenna to the unit array element spacing, and the second ratio is the ratio of the array aperture to the unit array element spacing; the array redundancy of the sparse array antenna is the minimum array redundancy corresponding to the current number of array elements. In the embodiment of the present invention, a type of sparse array antenna is provided, which can be reflected as the structural state of the minimum redundant linear array, and is more suitable for the practical application of array antennas in the electronic countermeasure reconnaissance and direction finding system of unmanned aerial vehicle platforms. At the same time, the direction finding performance is relatively strong.

An antenna array assembly comprises a plurality of horn array elements, each comprising a waveguide horn and a plurality of radiator patches, a planar substrate to which the plurality of horn array elements is attached, the planar substrate having a ground plane comprising a plurality of slots on a first side and a plurality of feed tracks on the second side; and a ground conductor configured as a reflector, the ground conductor being disposed parallel to the planar substrate and behind the planar substrate with respect to the horn array elements. A plurality of conductive members is disposed such that each conductive member is between the ground conductor and a respective horn array element, each conductive member being perpendicular to the ground conductor, and each conductive member being electrically connected to the ground conductor.

The present invention discloses a fan-shaped microstrip line array structure, circuit, and design method, wherein the fan-shaped microstrip line array structure includes: a main fan-shaped microstrip line for providing two first resonance points; two groups of auxiliary fan-shaped microstrip lines, the two groups of auxiliary fan-shaped microstrip lines have the same structure and are symmetrically arranged on both sides of the main fan-shaped microstrip line, and the auxiliary fan-shaped microstrip lines are used to provide multiple second resonance points; the arcs of the main fan-shaped microstrip line and the auxiliary fan-shaped microstrip line are both designed in a shape similar to a sine function; the frequencies of the two first resonance points and the frequencies of the multiple second resonance points are respectively distributed on both sides of a preset center frequency; the sum of the angular radians of the main fan-shaped microstrip line and the angular radians of the two groups of auxiliary fan-shaped microstrip lines is less than 180°. The present invention controls the resonance frequency of the fan-shaped microstrip line structure, and then constructs a fan-shaped microstrip line array unit to form a broadband circuit structure with multiple resonance frequency points to meet the design requirements of a broadband RF bias circuit. The present invention can be widely used in RF front-end systems.

The invention provides a passive linear array sonar array element level signal output method of a simulation system. The method comprises the following steps: setting parameters; generating a passive target source signal with a high sampling rate; calculating the signal receiving time delay of each hydrophone according to the orientation; simulating and generating each hydrophone to receive a target signal; marine environment background noise received by each hydrophone is simulated and generated; the analog signal, the analog noise and the actual array data are superposed to generate full-array element data; fourier transform and frequency domain beam forming are carried out on the time domain array element level data to obtain a passive space energy spectrum; and carrying out long-time accumulation on the multi-beam time domain data, and carrying out Fourier transform to obtain a multi-beam narrow-band Lofar. The method has the beneficial effects that linear array simulation data and actually measured array data in an ideal scene are fused, a playback function is achieved, and original array data redisk is supported. On the basis, an underwater acoustic target, noise and interference are added, array sample data are output, and trainees are supported to carry out training and assessment such as passive warning detection and target tracking.

The application discloses a kind of line array rotary time array shape correction and noise source positioning joint estimation method, system and computing device, and the joint estimation method includes the following steps: preliminary estimation line array element position;Preliminary positioning sound source position;Calculate the delay time of each array element in line array relative to the 1st array element, and calculate the steering vector and array flow pattern matrix;Establish target cost function and constraint condition to optimize and solve the correction amount of each array element in line array;According to the array element position under preliminary estimation array shape and the correction amount of each array element in line array, calculate the corrected line array element position;Based on second-order polynomial fitting method, curve fitting is carried out to each array element position, and the line array element position after curve fitting is obtained;Based on the new array element position, the array flow pattern matrix is corrected, and the sound source position is positioned again under the new array flow pattern using minimum variance distortionless response algorithm.

The invention discloses a virtual multi-channel interference suppression method for an antenna array, and belongs to the field of array signal processing. According to the invention, the problem that the interference suppression capability is reduced when a traditional method faces a novel interference scene is solved. The method comprises the following steps: firstly, analyzing a received signal by using a MUSIC algorithm to obtain an interference number, and estimating an angle of arrival of an expected signal and an interference signal; secondly, generating weights of each interference channel and each auxiliary channel, and obtaining a cancellation angle iteration initial value on the basis; using a Newton method to iteratively update cancellation angles of all interferences at all sampling points and refine an angle of arrival of a desired signal; and finally, calculating cancellation factors of all interferences at all sampling points to complete interference cancellation. The method has the capability of suppressing related interference, can adapt to interference of different intensities, can tolerate angle estimation errors of the MUSIC algorithm, and can calculate offset factors at all sampling moments through a few parameters so as to resist mobile interference. The method can be applied to suppression of interference signals.