CN112731360A

CN112731360A - Sharp broadband beam forming method and device based on two-stage time delay

Info

Publication number: CN112731360A
Application number: CN202110363477.6A
Authority: CN
Inventors: 李春雨; 邬松
Original assignee: Beijing Startest Tec Co Ltd
Current assignee: Beijing Startest Tec Co Ltd
Priority date: 2021-04-02
Filing date: 2021-04-02
Publication date: 2021-04-30

Abstract

The embodiment of the application discloses a sharpening broadband beam forming method and device based on double-stage time delay, and aims to solve the problems that the conventional beam forming mode cannot inhibit beam side lobe interference and causes low beam resolution. The method comprises the following steps: carrying out orthogonal transformation on an original signal received by an array element of a transducer to obtain an IQ signal corresponding to the original signal; the transducer array element comprises a plurality of array element channels; dividing the transducer array element into a plurality of spatially non-overlapping sub-arrays, and determining sub-array IQ signals corresponding to the sub-arrays respectively; performing inter-array delay processing on the sub-array IQ signals corresponding to each sub-array respectively to obtain sub-array delay IQ signals corresponding to each sub-array respectively; and carrying out beam sharpening processing on each subarray delay IQ signal to obtain a target high-resolution beam corresponding to the original signal. The technical scheme can inhibit the side lobe interference of the broadband wave beam and improve the measurement precision of the broadband multi-beam sounding system.

Description

Sharp broadband beam forming method and device based on two-stage time delay

Technical Field

The invention relates to the technical field of signal processing, in particular to a sharpening broadband beam forming method and device based on double-stage time delay.

Background

With the development of modern new technology, the broadband digital multi-beam depth sounding system can obtain higher spatial gain and spatial resolution, can meet higher detection precision and different depth sounding ranges, and becomes the mainstream of the multi-beam depth sounding system.

Most of broadband digital multi-beam sounding systems adopt broadband array signals, if the signals are processed by adopting a conventional narrowband beam forming mode, the signals are affected by aperture transit effect to cause beam pointing offset, and the broadband beam forming mode adopting digital delay can completely eliminate the aperture transit effect, but cannot avoid the problems of beam main lobe broadening and beam side lobe increasing. Therefore, a beam forming method capable of acquiring a high-resolution beam and improving the measurement quality of the broadband multi-beam sounding system is needed.

Disclosure of Invention

An object of the embodiments of the present application is to provide a sharpened broadband beamforming method and apparatus based on two-stage delay, so as to solve the problem that a conventional beamforming method cannot suppress beam sidelobe interference, resulting in low beam resolution.

In order to solve the above technical problem, the embodiment of the present application is implemented as follows:

in one aspect, an embodiment of the present application provides a sharpening broadband beam forming method based on two-stage delay, including:

carrying out orthogonal transformation on an original signal received by an array element of a transducer to obtain an IQ signal corresponding to the original signal; the transducer array element comprises a plurality of array element channels;

dividing the transducer array element into a plurality of spatially non-overlapping sub-arrays, and determining sub-array IQ signals corresponding to the sub-arrays respectively;

performing inter-array delay processing on the sub-array IQ signals corresponding to each sub-array respectively to obtain sub-array delay IQ signals corresponding to each sub-array respectively;

and carrying out beam sharpening processing on each subarray delay IQ signal to obtain a target high-resolution beam corresponding to the original signal.

In another aspect, an embodiment of the present application provides a sharpened broadband beamforming device based on dual-stage delay, including:

the orthogonal transformation module is used for carrying out orthogonal transformation on an original signal received by the transducer array element to obtain an IQ signal corresponding to the original signal; the transducer array element comprises a plurality of array element channels;

the dividing module is used for dividing the transducer array element into a plurality of spatially non-overlapping sub-arrays and determining sub-array IQ signals corresponding to the sub-arrays respectively;

the first processing module is used for respectively carrying out inter-array delay processing on the sub-array IQ signals corresponding to each sub-array to obtain sub-array delay IQ signals corresponding to each sub-array;

and the second processing module is used for carrying out beam sharpening processing on each subarray delay IQ signal to obtain a target high-resolution beam corresponding to the original signal.

In yet another aspect, an embodiment of the present application provides a sharpening broadband beamforming device based on dual-stage delay, including a processor and a memory electrically connected to the processor, where the memory stores a computer program, and the processor is configured to call and execute the computer program from the memory to implement: carrying out orthogonal transformation on an original signal received by an array element of a transducer to obtain an IQ signal corresponding to the original signal; the transducer array element comprises a plurality of array element channels;

In another aspect, an embodiment of the present application provides a storage medium for storing a computer program, where the computer program is executed by a processor to implement the following processes: carrying out orthogonal transformation on an original signal received by an array element of a transducer to obtain an IQ signal corresponding to the original signal; the transducer array element comprises a plurality of array element channels;

By adopting the technical scheme of the embodiment of the invention, IQ signals corresponding to original signals are obtained by carrying out orthogonal transformation on the original signals received by the array elements of the transducer, the array elements of the transducer are divided into a plurality of subarrays which are not overlapped in space, and the IQ signals of the subarrays corresponding to the subarrays are determined; and then, performing inter-array delay processing on the sub-array IQ signals corresponding to the sub-arrays respectively to obtain the sub-array IQ signals corresponding to the sub-arrays respectively, and then performing beam sharpening processing on the sub-array IQ signals to obtain target high-resolution beams corresponding to the original signals. Therefore, according to the technical scheme, the transducer array elements are divided into a plurality of sub-arrays, and then the signal delay processing is carried out on each sub-array, so that the data operation amount of the broadband multi-beam sounding system is greatly reduced, and the signal processing speed is improved; and the high-resolution beam result can be acquired, the side lobe interference of the broadband beam is inhibited, and the measurement precision of the broadband multi-beam sounding system is improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts;

FIG. 1 is a schematic flow diagram of a method of dual stage delay based sharpened wideband beamforming in accordance with an embodiment of the present invention;

FIG. 2 is a schematic architecture diagram of a dual stage delay based sharpened wideband beamforming method according to an embodiment of the present invention;

FIG. 3 is a schematic architecture diagram based on a two stage delay and sum method according to an embodiment of the present invention;

FIG. 4 is a diagram of exemplary simulation results of a method for sharpening wideband beamforming based on two-stage delay according to an embodiment of the present invention;

FIG. 5 is a diagram of exemplary simulation results of a method for sharpening wideband beamforming based on two-stage delay according to another embodiment of the present invention;

FIG. 6 is a diagram of exemplary simulation results of a method for sharpening wideband beamforming based on two-stage delay according to still another embodiment of the present invention;

FIG. 7 is a schematic block diagram of a dual stage delay based sharpened broadband beamforming device according to an embodiment of the present invention;

fig. 8 is a schematic block diagram of a dual stage delay based sharpened wideband beamforming device according to an embodiment of the present invention.

Detailed Description

The embodiment of the application provides a sharpening broadband beam forming method and device based on two-stage time delay, and aims to solve the problems that the conventional beam forming mode cannot inhibit beam side lobe interference and causes low beam resolution.

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Fig. 1 is a schematic flow chart of a sharpening broadband beamforming method based on two-stage delay according to an embodiment of the present invention, as shown in fig. 1, the method includes:

s102, carrying out orthogonal transformation on an original signal received by an array element of the transducer to obtain an IQ signal corresponding to the original signal; the transducer array includes a plurality of array element channels.

In this embodiment, the transducer elements are a uniform linear array having a plurality of array elements.

S104, dividing the transducer array into a plurality of non-overlapping subarrays in space, and determining the corresponding subarray IQ signals of each subarray.

S106, the inter-array delay processing is respectively carried out on the sub-array IQ signals corresponding to each sub-array, and the sub-array delay IQ signals corresponding to each sub-array are obtained.

And S108, carrying out beam sharpening on each subarray delay IQ signal to obtain a target high-resolution beam corresponding to the original signal.

The steps in the above examples are explained in detail below.

In one embodiment, when performing orthogonal transformation (i.e. performing S102) on an original signal received by an array element of a transducer, the original signal may be sampled according to a preset signal frequency and sampling time to obtain local oscillator signals of an I path and a Q path; and further multiplying the original signal by the local oscillator signals of the I path and the Q path respectively to obtain a multiplication result, and then performing low-pass filtering processing on the multiplication result to obtain an IQ signal corresponding to the original signal.

In this embodiment, can

Indicating the IQ signal of the ith array element at the nth sampling point. Wherein n and i are positive integers.

In one embodiment, the dividing of the transducer elements into a plurality of spatially non-overlapping sub-arrays and the determining of the IQ signals of the sub-arrays corresponding to the sub-arrays (i.e., performing S104) may be performed as the following steps a1-a 2:

and A1, performing in-array digital phase shift processing on each array element channel in the array element of the transducer to obtain a weighting vector corresponding to each array element channel.

And A2, performing weighting operation on array element signals respectively corresponding to the array element channels in each subarray according to the number of the array element channels in each subarray and each weighting vector to obtain the subarray IQ signals respectively corresponding to each subarray.

In step a1, performing in-array digital phase shift processing on each array element channel, and actually generating a weighting vector according to different delay differences of each array element channel, specifically: firstly, determining the number of array element channels contained in each subarray to be divided; and secondly, calculating the weighting vector corresponding to each array element channel according to the number of the array element channels in the subarray, the pointing angle of each array element channel, the array element interval and the surface sound velocity.

Wherein, if so

When the orientation angle of the array channel is

When it comes togFirst in the individual subarraykA weighting vector of each array element channel, then

Can be characterized using the following equation (1):

（1）

in the formula (1), the first and second groups,

denotes the g thFirst in the individual subarraykThe delay difference of the channels of the individual array elements relative to the reference array element,

，

indicates the number of element channels in the sub-array,

the space between the array elements is shown,

representing the surface acoustic velocity. The first array element channel in the sub-array is typically selected as the reference array element.

After the weighting vector corresponding to each array element channel is calculated according to the formula (1), the array element signals corresponding to the array element channels in each subarray are weighted, and the subarray IQ signals corresponding to each subarray can be obtained.

Considering that a broadband multi-beam sounding system meets the requirements of angular resolution and signal-to-noise ratio of received signals of different frequencies, a receiving array has hundreds of array elements, if each array element channel is subjected to complete broadband digital beam forming array processing, a large amount of calculation is needed, and a large amount of system resources are occupied, so that the system cannot process data in real time at all. Therefore, in this embodiment, the transducer array elements (i.e., the total array elements) are divided into G sub-arrays that are not overlapped in space according to the rule non-overlapping principle, so that the data computation amount of the broadband multi-beam sounding system can be greatly reduced, and the signal processing speed can be improved.

In one embodiment, when S106 is executed, the inter-array delay processing is performed on the IQ signals corresponding to each sub-array, so as to actually generate fractional delay filters corresponding to each sub-array according to different delay differences of each sub-array, and then the fractional delay filters are used to filter the IQ signals of the sub-array, thereby obtaining the IQ signals corresponding to each sub-array. Specifically, the following steps B1-B3 may be performed:

and step B1, respectively determining the delay difference of each subarray.

And step B2, generating a fraction delay filter corresponding to each subarray according to the delay difference of each subarray.

And step B3, filtering the sub-array IQ signals respectively corresponding to the sub-arrays by utilizing the fractional delay filters respectively corresponding to the sub-arrays to obtain the sub-array delay IQ signals respectively corresponding to the sub-arrays.

In this embodiment, the fractional delay filter may be a fixed order FIR filter, and its filter coefficients

Can be expressed as the following equation (2):

（2）

wherein the content of the first and second substances,

indicating the inter-array delay difference of the g-th sub-array with respect to the reference sub-array,

，lfor the order of the filter, the filter is,

indicates the number of element channels in the sub-array,gis shown asgThe number of the sub-arrays is equal to that of the sub-arrays,

indicating the orientation of the array channelsThe angle of the angle is set to be,

representing the surface acoustic velocity. Typically, the first sub-array is selected as the reference sub-array.

And (3) calculating filter coefficients of the fractional delay filters respectively corresponding to the sub-arrays according to a formula (2), namely generating the fractional delay filters respectively corresponding to the sub-arrays, and then respectively filtering the corresponding sub-array IQ signals by utilizing the fractional delay filters respectively corresponding to the sub-arrays to compensate for larger delay differences among the sub-arrays, so as to obtain the sub-array IQ signals respectively corresponding to the sub-arrays.

Through the division mode of the embodiment, the total array element can be divided into G spatially non-overlapping sub-arrays, and the array element channels in each sub-array can be expressed as

And further, correspondingly calculating the G sub-arrays by adopting an intra-array digital phase shift and inter-array time domain delay method to obtain sub-array delay IQ signals respectively corresponding to the G sub-arrays.

In one embodiment, when performing beam sharpening on each subarray delay IQ signal to obtain a target high-resolution beam corresponding to an original signal (i.e., performing S108), a delay summation calculation may be performed on each subarray delay IQ signal to obtain a first processing result; secondly, performing time delay summation calculation on each first processing result to obtain a second processing result; and then, outputting a target high-resolution beam corresponding to the original signal according to a second processing result.

In this embodiment, a Double Stage Delay-Sum (DS-DMAS) method is adopted for performing beam-sharpening on each subarray Delay IQ signal, if the method is adopted

Representing the final output target high-resolution beam, the implementation process of the above two-stage delay and sum method can be expressed as the following formula (3):

（3）

wherein the content of the first and second substances,

，

is shown as

At a sampling point

And delaying IQ signals by the sub-arrays corresponding to the sub-arrays. G is the number of sub-arrays obtained after the total array elements are divided.

In one embodiment, a dual stage delay based sharpened wideband beamforming method may be interpreted as fig. 2. As shown in fig. 2, an original signal received by the total array element (i.e., the transducer element) is first subjected to orthogonal transformation to obtain an IQ signal corresponding to the original signal. Secondly, the transducer array elements are divided into a plurality of sub-arrays which are not overlapped in space by adopting an in-array digital phase shifting method, and sub-array IQ signals which are respectively corresponding to each sub-array are calculated, in the step, weighting vectors which are respectively corresponding to each array element channel of the transducer array elements can be calculated, then, according to the number of the array element channels in each sub-array and the weighting vectors, the array element signals which are respectively corresponding to the array element channels in each sub-array are subjected to weighted summation operation, namely, the sub-array IQ signals which are respectively corresponding to each sub-array are calculated, and after two processes of phase shifting and an adder shown in fig. 2, the divided sub-arrays 1 and … sub-arrays G are obtained. Thirdly, performing inter-array delay processing on each subarray IQ signal obtained after division, namely performing a fractional delay process as shown in FIG. 2, further performing two-stage delay summation calculation on the result after delay processing, and finally outputting a target high-resolution beam as shown in a DS-DMAS beam forming process as shown in FIG. 2.

In one embodiment, the "DS-DMAS beamforming" process shown in fig. 2 may be further explained as fig. 3. As shown in fig. 3, first, a delay summation calculation is performed on each subarray delay IQ signal, as in the process of "adder" and "multiplier" in fig. 3, to obtain a first processing result, where "first-

order synthesis output

1, 2, … … G-1 shown in fig. 3 is the first processing result; secondly, performing delay summation calculation on each first processing result, such as an adder process in fig. 3, to obtain a second processing result, where "second-

order synthesis outputs

1, 2, … … G-1 shown in fig. 3 are the second processing result; and then outputs the target high resolution beam corresponding to the original signal according to the second processing result, for example, through the "adder" process shown in fig. 3. In this embodiment, the calculation method of the two-stage delay summation has been described in detail in the above embodiments, and is not described herein again.

The advantages of the sharpened broadband beamforming method based on dual-stage delay provided by the present embodiment are illustrated by several simulation experiments.

In one embodiment, the beam width and the angle resolution of the sharpened broadband beamforming method based on the double-stage delay are respectively subjected to simulation analysis. The simulation signal is assumed to be a CW pulse signal, the center frequency is 200KHz, and the array element number is M = 192. Simulation shows that when the array element beam pointing angle is 0 °, compared with the conventional beam forming mode, the sharpening broadband beam forming method based on the double-stage delay has a narrower main lobe and a higher main-to-side ratio. As shown in fig. 4-5, if two similar echo signals near 0 ° are selected for analyzing the angle resolution of the target, when the target angles are-0.5 ° and 0.5 °, compared with the conventional beamforming method, the sharpening wideband beamforming method based on the bi-level delay can clearly distinguish the two targets, and the angle resolution is stronger.

FIG. 6 is a diagram illustrating a beam output after applying a sharpened wideband beamforming process to the outfield measured data in one embodiment. As shown in fig. 6, the left side is the beam output result corresponding to the conventional beam forming method, and the right side is the beam output result corresponding to the sharpened wideband beam forming method based on the bi-level delay in this embodiment. As can be seen from the figure, the output result of the conventional beamforming has strong side lobes right below, and energy leaks into the main lobes of other beams, which causes large interference to the edge beam bottom detection algorithm with weak energy. And no obvious side lobe can be observed in the output result of the sharpening broadband beam forming method based on the two-stage time delay, so that the sharpening broadband beam forming method based on the two-stage time delay can obtain sharper beam output and can well inhibit the interference of the side lobe.

In summary, particular embodiments of the present subject matter have been described. Other embodiments are within the scope of the following claims. In some cases, the actions recited in the claims can be performed in a different order and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may be advantageous.

Based on the same idea, the sharpening broadband beam forming method based on the two-stage delay provided by the embodiment of the present application further provides a sharpening broadband beam forming device based on the two-stage delay.

Fig. 7 is a schematic block diagram of a sharpened broadband beamforming device based on two-stage delay according to an embodiment of the invention, and as shown in fig. 7, the sharpened broadband beamforming device based on two-stage delay comprises:

an orthogonal transformation module 710, configured to perform orthogonal transformation on an original signal received by an array element of a transducer to obtain an IQ signal corresponding to the original signal; the transducer array element comprises a plurality of array element channels;

a dividing module 720, configured to divide the transducer array element into a plurality of spatially non-overlapping sub-arrays, and determine sub-array IQ signals corresponding to the sub-arrays respectively;

a first processing module 730, configured to perform inter-array delay processing on the IQ signals corresponding to each subarray, respectively, to obtain IQ signals corresponding to each subarray;

the second processing module 740 is configured to perform beam sharpening on each subarray delay IQ signal to obtain a target high-resolution beam corresponding to the original signal.

In one embodiment, the orthogonal transformation module 710 includes:

the sampling unit is used for sampling the original signal according to preset signal frequency and sampling time to obtain local oscillation signals of an I path and a Q path;

the multiplying unit is used for multiplying the original signals by the local oscillator signals of the path I and the path Q respectively to obtain a multiplication result;

and the first processing unit is used for performing low-pass filtering processing on the multiplication result to obtain the IQ signal corresponding to the original signal.

In one embodiment, the partitioning module 720 includes:

the phase shift processing unit is used for carrying out in-array digital phase shift processing on each array element channel in the transducer array element to obtain a weighting vector corresponding to each array element channel;

and the weighting operation unit is used for performing weighting operation on array element signals respectively corresponding to the array element channels in each subarray according to the number of the array element channels in each subarray and each weighting vector to obtain the subarray IQ signals respectively corresponding to each subarray.

In one embodiment, the phase shift processing unit is further configured to:

determining the number of the array element channels contained in each subarray to be divided;

and aiming at any subarray, calculating a weighting vector corresponding to each array element channel according to the number of the array element channels in the subarray, the pointing angle of each array element channel, the array element interval and the surface sound velocity.

In one embodiment, the first processing module 730 includes:

a determining unit configured to determine delay differences of the respective sub-arrays;

a generating unit, configured to generate a fractional delay filter corresponding to each of the sub-arrays according to the delay difference of each of the sub-arrays;

and a filtering unit, configured to filter the sub-array IQ signals corresponding to each sub-array by using the fractional delay filter corresponding to each sub-array, so as to obtain the sub-array delayed IQ signals corresponding to each sub-array.

In one embodiment, the second processing module 740 comprises:

the first calculating unit is used for carrying out delay summation calculation on each subarray delay IQ signal to obtain a first processing result;

the second calculating unit is used for carrying out time delay summation calculation on each first processing result to obtain a second processing result;

and the output unit is used for outputting the target high-resolution beam corresponding to the original signal according to the second processing result.

By adopting the device provided by the embodiment of the invention, IQ signals corresponding to the original signals are obtained by carrying out orthogonal transformation on the original signals received by the transducer array elements, the transducer array elements are divided into a plurality of subarrays which are not overlapped in space, and the IQ signals of the subarrays corresponding to the subarrays are determined; and then, performing inter-array delay processing on the sub-array IQ signals corresponding to the sub-arrays respectively to obtain the sub-array IQ signals corresponding to the sub-arrays respectively, and then performing beam sharpening processing on the sub-array IQ signals to obtain target high-resolution beams corresponding to the original signals. Therefore, the device divides the transducer array element into a plurality of sub-arrays and then respectively carries out signal delay processing on each sub-array, so that the data operation amount of the broadband multi-beam sounding system is greatly reduced, and the signal processing speed is improved; and the high-resolution beam result can be acquired, the side lobe interference of the broadband beam is inhibited, and the measurement precision of the broadband multi-beam sounding system is improved.

It should be understood by those skilled in the art that the dual stage delay based sharpened wideband beamforming device in fig. 7 can be used to implement the dual stage delay based sharpened wideband beamforming method described above, wherein the detailed description thereof should be similar to that of the method described above, and further description thereof is omitted here for the sake of avoiding complexity.

Based on the same idea, embodiments of the present application further provide a sharpened broadband beamforming device based on dual-stage delay, as shown in fig. 8. A dual stage delay based sharpened wideband beamforming device may vary significantly from configuration to configuration or from performance to performance and may include one or more processors 801 and memory 802, where one or more stored applications or data may be stored in memory 802. Wherein the memory 802 may be a transient storage or a persistent storage. The application program stored in memory 802 may include one or more modules (not shown), each of which may include a series of computer-executable instructions for a dual stage delay based sharpening broadband beamforming device. Still further, the processor 801 may be configured to communicate with the memory 802, and execute a series of computer-executable instructions in the memory 802 on the dual stage delay based sharpened broadband beamforming device. The dual stage delay based sharpening broadband beamforming device may also include one or more power supplies 803, one or more wired or wireless network interfaces 804, one or more input-output interfaces 805, one or more keyboards 806.

In particular, in this embodiment, a dual stage delay based sharpened broadband beamforming device comprises a memory, and one or more programs, wherein the one or more programs are stored in the memory, and the one or more programs may comprise one or more modules, and each module may comprise a series of computer-executable instructions for the dual stage delay based sharpened broadband beamforming device, and the one or more programs configured to be executed by one or more processors comprise computer-executable instructions for:

The embodiment of the present application further provides a storage medium, where the storage medium stores one or more computer programs, where the one or more computer programs include instructions, and when the instructions are executed by an electronic device including multiple application programs, the electronic device can execute each process of the foregoing sharpening broadband beam forming method based on dual-stage delay, and can achieve the same technical effect, and details are not repeated here to avoid repetition.

The systems, devices, modules or units illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions. One typical implementation device is a computer. In particular, the computer may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functionality of the units may be implemented in one or more software and/or hardware when implementing the present application.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.

Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A sharpened broadband beamforming method based on two-stage delay is characterized by comprising the following steps:

2. The method of claim 1, wherein performing an orthogonal transformation on an original signal received by a transducer array element to obtain an IQ signal corresponding to the original signal comprises:

sampling the original signal according to preset signal frequency and sampling time to obtain local oscillation signals of an I path and a Q path;

multiplying the original signal by the local oscillator signals of the path I and the path Q respectively to obtain a multiplication result;

and carrying out low-pass filtering processing on the multiplication result to obtain the IQ signal corresponding to the original signal.

3. The method of claim 1, wherein the dividing the transducer elements into a plurality of spatially non-overlapping sub-arrays, and the determining the IQ signal for each sub-array comprises:

performing in-array digital phase shift processing on each array element channel in the transducer array element to obtain a weighting vector corresponding to each array element channel;

and according to the number of the array element channels in each subarray and each weighting vector, performing weighting operation on the array element signals respectively corresponding to the array element channels in each subarray to obtain the subarray IQ signals respectively corresponding to each subarray.

4. The method of claim 3, wherein said performing an in-array digital phase shift on each of said array element channels in said transducer array element to obtain a weighting vector corresponding to each of said array element channels comprises:

5. The method according to claim 1, wherein said performing inter-matrix delay processing on the sub-matrix IQ signal corresponding to each of the sub-matrices to obtain the sub-matrix delayed IQ signal corresponding to each of the sub-matrices, respectively, comprises:

respectively determining the delay difference of each subarray;

generating a fraction delay filter corresponding to each subarray according to the delay difference of each subarray;

and filtering the sub-array IQ signals respectively corresponding to the sub-arrays by using the fractional delay filters respectively corresponding to the sub-arrays to obtain the sub-array IQ signals respectively corresponding to the sub-arrays.

6. The method according to claim 2, wherein the performing the beam sharpening process on each of the subarray delay IQ signals to obtain a target high resolution beam corresponding to the original signal comprises:

performing delay summation calculation on each subarray delay IQ signal to obtain a first processing result;

performing time delay summation calculation on each first processing result to obtain a second processing result;

and outputting the target high-resolution beam corresponding to the original signal according to the second processing result.

7. A dual stage delay based sharpened wideband beamforming device comprising:

8. The apparatus of claim 7, wherein the orthogonal transform module comprises:

9. A dual stage delay based sharpening broadband beamforming device comprising a processor and a memory electrically connected to the processor, the memory storing a computer program, the processor being configured to invoke and execute the computer program from the memory to implement:

10. A storage medium for storing a computer program which, when executed by a processor, implements the following: