CN114740277A - Method and system for correcting radiation characteristic of curved array - Google Patents
Method and system for correcting radiation characteristic of curved array Download PDFInfo
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Abstract
The application relates to a method and a system for correcting radiation characteristics of a curved surface array, wherein the method comprises the following steps: determining two array elements on the curved-surface array which are closest to the center of the array as correction base points; calculating the array element projection position of each array element on the projected curved surface array based on the correction base point; the array element spacing on the projected curved surface array is the same as the array element spacing on the equal-length uniform planar array; acquiring the real position of each array element on the curved surface array; calculating the difference between the real position of each array element and the projection position of the corresponding array element to obtain the projection position error of each array element on the curved surface array; and carrying out phase compensation processing on the directional diagram of the curved surface array by using the projection position error of each array element to obtain the directional diagram of the curved surface array after radiation characteristic correction. By adopting the improved projection method, the phase compensation can be carried out on the uniform curved array with any curvature, an array directional diagram close to the performance of a planar array is obtained, and the phase compensation effect on the curved array antenna is obviously improved.
Description
Technical Field
The invention belongs to the technical field of antenna signal processing, and relates to a method and a system for correcting radiation characteristics of a curved surface array.
Background
With the continuous development of antenna technology, different types of antennas are developed in a large number and are widely applied to various high and new technical fields. A Conformal Array Antenna (CAA) refers to an Antenna Array that conforms to the shape of an object, that is, each Array unit is distributed on the surface of an electronic system carrier and the Array surface is attached to the shape of a carrier platform. Compare traditional planar array antenna, the aerodynamic characteristics of carrier still can be compromise to conformal array antenna on the basis that satisfies antenna performance requirement itself, and because the position of antenna installation is special, has improved the space utilization in the carrier to a certain extent. In addition, the conformal array antenna is distributed in a three-dimensional space, and accordingly the space coverage range is improved. Due to the advantages of the conformal array antenna, the conformal array antenna becomes a research hotspot in the antenna field, has attracted extensive attention in related fields such as radar, communication and navigation, and is a main direction of antenna development in the future.
The radiation characteristic correction (array manifold error correction) of the conformal array antenna is a key technical basis for the application and development of the conformal array antenna, and currently, a phase compensation method is generally adopted for correction, and includes an array element connection phase compensation method, a radial phase compensation method, a Z-direction phase compensation method and the like, wherein the Z-direction phase compensation method is most widely applied, and the Z-direction phase compensation method is also called a projection method. However, in the process of implementing the present invention, the inventor finds that the conventional projection method is a problem of correcting the radiation characteristic of the curved array antenna, and still has a technical problem of poor phase compensation effect.
Disclosure of Invention
In view of the problems in the conventional methods, the present invention provides a method and a system for correcting radiation characteristics of a curved array, and also provides a signal processing device and a computer-readable storage medium, which can significantly improve the phase compensation effect for a curved array antenna.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in one aspect, a method for correcting radiation characteristics of a curved array is provided, which includes the steps of:
determining two array elements on the curved-surface array which are closest to the center of the array as correction base points;
calculating the array element projection position of each array element on the projected curved surface array based on the correction base point; the array element spacing on the projected curved surface array is the same as the array element spacing on the equal-length uniform planar array;
acquiring the real position of each array element on the curved surface array;
calculating the difference between the real position of each array element and the projection position of the corresponding array element to obtain the projection position error of each array element on the curved surface array;
and carrying out phase compensation processing on the directional diagram of the curved surface array by using the projection position error of each array element to obtain the directional diagram of the curved surface array after radiation characteristic correction.
In another aspect, a system for correcting radiation characteristics of a curved array is provided, including:
the base point determining module is used for determining two array elements closest to the center of the array on the curved surface array as correction base points;
the projection position module is used for calculating the array element projection position of each array element on the projected curved surface array based on the correction base point; the array element spacing on the projected curved surface array is the same as the array element spacing on the equal-length uniform planar array;
the array element position module is used for acquiring the real position of each array element on the curved surface array;
the projection error module is used for calculating the difference between the real position of each array element and the projection position of the corresponding array element to obtain the projection position error of each array element on the curved surface array;
and the compensation processing module is used for carrying out phase compensation processing on the directional diagram of the curved surface array by utilizing the projection position error of each array element to obtain the directional diagram of the curved surface array after radiation characteristic correction.
In still another aspect, a signal processing device is provided, which includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the radiation characteristic correction method for the curved surface array when executing the computer program.
In still another aspect, a computer-readable storage medium is provided, on which a computer program is stored, which when executed by a processor implements the steps of the above-mentioned radiation characteristic correction method for a curved surface array.
One of the above technical solutions has the following advantages and beneficial effects:
according to the radiation characteristic correction method and system of the curved surface array, an improved projection method is adopted, namely, the position of an array element close to the center of the curved surface array is used as a correction reference, the array element projection positions of other array elements are obtained through array element interval calculation, then the position difference between the real position of the array element of each array element on the curved surface array and the array element projection position of the corresponding array element projected by the improved projection method is calculated, finally, the obtained projection position error is utilized to carry out phase compensation processing on the directional diagram of the curved surface array, and the directional diagram corrected by the radiation characteristic is obtained. Therefore, the scheme has the characteristics of wider application range, more excellent phase compensation effect and the like in the uniform curved surface array, and can realize the phase compensation of the uniform curved surface array with any curvature so as to obtain an array directional diagram close to the performance of a plane array, thereby remarkably improving the phase compensation effect of the curved surface array antenna.
Drawings
FIG. 1 is a diagram of array signal transmission in one embodiment;
FIG. 2 is a schematic flow chart illustrating a method for radiation characteristic correction of a curved array according to an embodiment;
FIG. 3 is a schematic diagram illustrating the relationship between the array elements m and the curvature angles of a curved array in one embodiment;
FIG. 4 is a schematic diagram of array element projection in a conventional projection method;
FIG. 5 is a schematic diagram illustrating a comparison of the projection of an array element between an improved projection method and a conventional projection method according to an embodiment;
fig. 6 is a schematic diagram of the phase diagrams before and after phase compensation of the curved array in an embodiment when M is 64 and q is pi/2;
fig. 7 is a schematic diagram of the phase compensation front and back directional diagrams of the curved array in an embodiment when M is 64 and q is 2 × pi/3;
fig. 8 is a schematic diagram of the phase compensation front and back directional diagrams of the curved array in an embodiment when M is 64 and q is pi;
FIG. 9 is a diagram illustrating integrated sidelobe ratio values for various states at different curvatures in one embodiment;
FIG. 10 is a graph illustrating RMSE curves for two methods as curvature increases, under an embodiment;
fig. 11 is a block diagram of a radiation characteristic correction system for a curved array according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The following detailed description of embodiments of the invention will be made with reference to the accompanying drawings.
The curved array antenna belongs to a typical conformal array antenna. When the uniform planar array antenna is adopted, the receiving and transmitting wave path difference between each array element and the center of the array is an equal proportional array, and main lobe beams with good focusing performance can be formed by spatial superposition; for the curved array antenna, the transmit-receive path difference of each array element is no longer maintained in an equal ratio relationship, so that the main lobe performance of the directional diagram is seriously deteriorated. In practical engineering application, in order to make the radiation characteristic of the curved array antenna close to that of the planar array antenna and avoid the influence of array deformation on the performance of the azimuth, the deformation of the conformal array antenna needs to be corrected, which is a technical problem with important research significance and a key factor restricting the development and application of the conformal array antenna.
However, analysis finds that when the curvature of the curved-surface array antenna is too high, the phase compensation effect of the conventional projection method becomes worse, and the actual application requirement cannot be met. Therefore, the present application provides a new calibration method (also referred to as an improved projection method) for the technical problem of poor phase compensation effect existing when the radiation characteristic of a curved array antenna is calibrated by using the conventional projection method, and by using the array element position of the curved array near the center of the array as a calibration reference and using the array element interval calculation to obtain the positions of the rest array elements, a calibrated array pattern is obtained, so that the method has the characteristics of wider application range, more excellent phase compensation effect and the like in a uniform curved array, and can implement phase compensation on a uniform curved array with any curvature, so as to obtain an array pattern with performance close to that of a planar array.
For the purpose of intuitive and detailed description of the following method, the following description is developed in a rectangular coordinate system. It will be understood by those skilled in the art that the following method can also be applied to other coordinate systems, and the following method can be applied to the same way only by transforming the coordinate relationship (between coordinate systems) of the relevant parameters, and thus the following method is not limited to be applied to the rectangular coordinate system.
As shown in fig. 1, which is a schematic diagram of array signal transmission, the number of array elements in fig. 1 is M, wherein the interval of each array element of the uniform planar array is denoted as l, and the array elements are distributed on the x axis in an equidistant manner, unlike the conventional planar array, when the array substrate is made of flexible variable material, the planar array can be deformed into a curved array with any curvature, as shown in the curved array 1 and the curved array 2 in fig. 1, respectively, assuming that the curvatures of the two curved arrays are q respectively1And q is2(q1＞q2) The larger the curvature q is, the larger the degree of curvature of the curved surface array is. When the azimuth angle is theta, the distribution of the array pattern formed by the superposition of the array elements in the space can be expressed as:
wherein x ismAnd ymThe x-axis coordinate and the y-axis coordinate corresponding to the mth array element are respectively, and M is 1, 2. k is 2 pi f/c is wave number, f is emission signal frequency, and c is light speed.
In the case of a planar array, the array,coordinates y of each array elementmAll set to zero, equation (1) can be rewritten as:
referring to fig. 2, an embodiment of the present application provides a method for calibrating radiation characteristics of a curved array, including the following steps S12 to S20:
and S12, determining two array elements closest to the center of the array on the curved-surface array as correction base points.
It is understood that the array center refers to the arc midpoint of the curved surface array, and therefore, the calibration base point is two array elements (positions) on two sides of the arc midpoint of the curved surface array, which are nearest to the midpoint.
S14, calculating the array element projection position of each array element on the projected curved surface array based on the correction base point; the array element spacing on the projected curved surface array is the same as the array element spacing on the equal-length uniform planar array.
It is understood that the equal-length uniform planar array refers to a uniform planar array having the same array length as the curved array, and the same number of array elements may be distributed on the two arrays within the array length. Therefore, the projection plane of the curved array can be set as the plane of the equal-length uniform planar array or the x-axis plane.
And S16, acquiring the real position of each array element on the curved-surface array.
It is understood that the real position of each array element refers to the position coordinates of each array element in the current coordinate system on the curved array. The actual position of each array element can be provided in advance, or can be directly measured and read from a coordinate system by the carrier device or obtained by other methods.
In one embodiment, regarding the step S16 described above, the method includes:
acquiring the curvature and the array length of the curved surface array, and performing equidistant segmentation processing on the curvature;
determining element azimuth angles corresponding to the array elements on the curved surface array according to the divided curvatures;
and calculating to obtain the real position of each array element according to the curvature, the array length and the element azimuth angle.
It can be understood that for a curved array, an arc model is adopted to fit the curvature of the array and the position coordinates x of each array elementmAnd ymAs shown in fig. 3, a curvature value q corresponding to the curved surface array is set, and since the curved surface array is a uniform curved surface array (the non-uniform curved surface array may also be processed by being divided into a plurality of uniform curved surface arrays), and the curvature is equally divided into M parts, an angle (i.e., the element azimuth angle) corresponding to the array element M can be expressed as:
α＝q/M*m-q/2 (3)
in one embodiment, the true position of the array element is calculated by the following formula:
wherein x ismRepresenting the x-axis coordinate, y, of each array element in the rectangular coordinate system on the curved arraymThe array element number of the curved surface array is expressed by the following formula, wherein the formula represents the y-axis coordinate of each array element in the rectangular coordinate system on the curved surface array, r represents the radius of a circle where the curved surface array is located, alpha represents the element azimuth angle, and M is 1, 2.
Specifically, when the curved array deforms, the length of the array is always kept unchanged, and 1 is L1＝(M-1)*l，L1That is, the arc length in fig. 2, and the radius of the circle is denoted as r ═ L1Q, then x can be calculated by the formula (4)mAnd ymThe value of (c).
As shown in fig. 4, it can be seen that the higher the degree of curvature of the planar array is, the larger the distortion of the curved surface occurs, the larger the position difference between each array element on the deformed curved array and the array element corresponding to the planar array is, as shown by the position difference X' corresponding to the curved array with small curvature and the position difference X ″ corresponding to the curved array with large curvature; and the difference between the positions of two array elements which are generally close to the center of the array after the planar array is curved and the original position is relatively small, so that the position of the array element which is close to the center of the array is used as a correction reference, and the positions of the rest array elements can be obtained through calculation of an array element interval l, and further a corrected array directional diagram is obtained. Wherein, the array element n is the array element in the array.
In one embodiment, the array element projection position of each array element on the projected curved surface array is calculated by the following formula:
where m represents the left side origin of correction closest to the array center on the curved array, m +1 represents the left side origin of correction closest to the array center on the curved array, and l represents the array element spacing.
Specifically, two array elements closest to the center of the array of the curved surface array are selected as base points, as shown in fig. 5, it is assumed that the two array elements closest to the center of the array are array element m and array element m +1, and when the improved projection method is adopted for processing, the distance between each projected array element (array element distance) is kept the same as that of the uniform planar array, and then the projection position coordinates of the array elements of the remaining array elements can be calculated by the above formula (5). As shown in fig. 5, a schematic position diagram of array elements m-1, m +1 and m +2 adjacent to array element m after projection is given.
And S18, calculating the difference between the real position of each array element and the projection position of the corresponding array element to obtain the projection position error of each array element on the curved-surface array.
It can be understood that after the real position of each array element on the curved surface array and the projected array element projection position thereof are obtained, the projection position error of each array element can be respectively calculated.
In one embodiment, the projection position error of each array element on the curved surface array is calculated by the following formula:
wherein m represents the m-th array element on the curved array,
the projection position of the array element corresponding to the array element m is shown in the rectangular seatX-axis coordinate in the system.
The projection part can not consider the position coordinate in the y-axis direction, so the projection position error data of each array element can be quickly obtained by the position error calculation mode.
And S20, performing phase compensation processing on the directional diagram of the curved array by using the projection position error of each array element to obtain the directional diagram of the curved array after radiation characteristic correction.
It can be understood that after the projection position error of each array element is obtained, the error data can be used as a phase compensation term in the directional diagram calculation of the curved surface array, so as to obtain a corrected directional diagram.
In one embodiment, the radiation characteristic corrected directional diagram of the curved array is calculated by the following formula:
wherein, PimproveExpressing the radiation characteristic corrected directional diagram of the curved surface array, M expressing the array element number of the curved surface array, k expressing the wave number, xmRepresenting the x-axis coordinate, y, of each array element in the rectangular coordinate system on the curved arraymAnd the y-axis coordinate of each array element on the curved-surface array in the rectangular coordinate system is represented, theta represents an azimuth angle, and D represents a projection position error.
Specifically, the phase compensation processing is performed on the curved array directional diagram by using the calculated position error of each array element according to the formula (7).
As shown in fig. 5, the solid line arrow is an array element position change track corresponding to the improved projection method, the dotted line arrow is an array element position change track corresponding to the conventional projection method, and the phase compensation performed by the conventional projection method is to directly set the coordinates of each array element on the curved array in the y-axis direction to zero, so that the directional diagram received at the target position P from the curved array at this time is calculated by the following formula:
it can be seen that the method is different from the phase compensation method in the improved projection method adopted in the present application.
The radiation characteristic correction method of the curved surface array adopts an improved projection method, namely, the position of an array element close to the center of the curved surface array is used as a correction reference, the array element projection positions of other array elements are obtained through array element interval calculation, then the position difference between the real position of the array element of each array element on the curved surface array and the array element projection position of the corresponding array element projected by the improved projection method is calculated, and finally the obtained projection position error is utilized to carry out phase compensation processing on the directional diagram of the curved surface array, so that the directional diagram corrected by the radiation characteristic is obtained. Therefore, the scheme has the characteristics of wider application range, more excellent phase compensation effect and the like in the uniform curved surface array, and can realize the phase compensation of the uniform curved surface array with any curvature so as to obtain an array directional diagram close to the performance of a plane array, thereby remarkably improving the phase compensation effect of the curved surface array antenna.
In an embodiment, in order to more intuitively and comprehensively describe the radiation characteristic correction method for the curved surface array, a certain type of curved surface array is taken as an example, and the radiation characteristic correction method for the curved surface array provided by the invention is subjected to simulation application and comparative description.
It should be noted that the implementation examples given in this specification are only illustrative and are not the only limitations of the specific implementation examples of the present invention, and those skilled in the art can implement simulation applications on different curved surface arrays by using the radiation characteristic correction method of the curved surface array provided above in the same manner under the schematic illustration of the implementation examples provided in the present invention.
The number of array elements is set to be M-64, the frequency of a transmitting signal is set to be f-5.68 GHz, the distance between the array elements is l-lambda/2, lambda-c/f is the wavelength, and the angle range theta of a directional diagram belongs to [ -90 degrees, 90 degrees ]. When a curved surface array pattern is simulated, the curvatures are q pi/2, q 2 pi/3 and q pi respectively, wherein q 0 represents that the array is in a planar array state at the moment, and the other sequentially increasing q values respectively represent three curved surface arrays with increasingly severe bending degrees.
As shown in fig. 6-8, a planar array pattern, an original curved array pattern and two compensated array patterns (conventional and described above in this application) of phase compensation methods are plotted, wherein M is 64 and l is 0.05, and q is different. As shown in fig. 6, when the value of q is small, i.e. the curved array is curved less than the planar array, the compensation effect of the main lobe and the adjacent side lobes are different but not large, and the improved projection method is better than the conventional projection method for the compensation effect of the side lobes far from the main lobe, so that the phase compensation projection method and the conventional improved projection method can be performed on the curved array under the condition of low curvature.
As shown in fig. 7, the advantages of the improved projection method provided by the present application gradually appear, and especially in the comparison of the three diagrams in fig. 6 to fig. 8, it can be clearly seen that the phase compensation effect of the improved projection method is obviously better than that of the conventional projection method along with the increase of the curvature, the phase compensation of the conventional projection method has a larger difference between the directional diagram and the side lobe of the waveform of the planar array directional diagram, and the curved array directional diagram and the planar array waveform after the phase compensation of the improved projection method can basically keep the same. Therefore, in the curved surface state with high curvature, phase compensation by using the modified projection method is a better choice.
To further compare the performance of the improved projection method proposed in the present application with the conventional projection method, the integrated sidelobe ratio (ISLR) and Root Mean Square Error (RMSE) of the array directivity diagram were calculated:
the ISLR and RMSE comparison results are shown in fig. 9 and fig. 10, respectively, and it can be found from fig. 9 that, under different curvatures, the integrated sidelobe ratio of the directional diagram after the improved projection method compensation is very close to the original planar array, while the integrated sidelobe ratio of the directional diagram after the traditional projection method is performed with the phase compensation is gradually increased from the planar array as the curvature is larger. It can be seen from fig. 10 that the RMSE overall trend of the projection method is moving towards larger and larger as the curvature increases, but the RMSE value of the improved projection method is still in a small range, so the effect of the improved projection method is better than that of the conventional projection method, and the compensation effect of the conventional projection method is rapidly deteriorated as the curvature increases.
Combining the results of the ISLR and RMSE analyses can lead to the conclusion that: when the curvature is increased, although the focusing performance of the main lobe is almost the same, the side lobe performance of the traditional projection method is seriously deteriorated, so that the difference between the ISLR value and the plane array of the curved surface array directional diagram after phase compensation is increased, and the RMSE value is also continuously increased.
It should be understood that, although the various steps in the flowchart of fig. 1 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps of fig. 1 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
Referring to fig. 11, in an embodiment, a radiation characteristic calibration system 100 for a curved array is further provided, which includes a base point determination module 11, a projection position module 13, an array element position module 15, a projection error module 17, and a compensation processing module 19. The base point determining module 11 is configured to determine two array elements on the curved array that are closest to the center of the array as the calibration base points. The projection position module 13 is configured to calculate an array element projection position of each array element on the projected curved surface array based on the calibration base point; the array element spacing on the projected curved surface array is the same as the array element spacing on the equal-length uniform planar array. The array element position module 15 is configured to obtain an actual position of each array element on the curved-surface array. The projection error module 17 is configured to obtain a projection position error of each array element on the curved-surface array by calculating a difference between a real position of each array element and a projection position of the corresponding array element. The compensation processing module 19 is configured to perform phase compensation processing on the directional diagram of the curved array by using the projection position error of each array element, so as to obtain a directional diagram of the curved array after radiation characteristic correction.
The radiation characteristic correction system 100 of the curved surface array adopts an improved projection method through the cooperation of each module, namely, the position of an array element close to the center of the curved surface array is used as a correction reference, the array element projection positions of other array elements are obtained through array element interval calculation, then the position difference between the real position of the array element of each array element on the curved surface array and the array element projection position of the corresponding array element projected by adopting the improved projection method is calculated, and finally, the obtained projection position error is utilized to carry out phase compensation processing on the directional diagram of the curved surface array, so that the directional diagram corrected by the radiation characteristic is obtained. Therefore, the scheme has the characteristics of wider application range, more excellent phase compensation effect and the like in the uniform curved surface array, and can realize the phase compensation of the uniform curved surface array with any curvature so as to obtain an array directional diagram close to the performance of a plane array, thereby remarkably improving the phase compensation effect of the curved surface array antenna.
In one embodiment, the array element location module 15 includes an array parameters submodule, an array element orientation submodule, and an array element location submodule. The array parameter submodule is used for acquiring the curvature and the array length of the curved surface array and performing equidistant segmentation processing on the curvature. And the array element azimuth submodule is used for determining the element azimuth angle corresponding to each array element on the curved surface array according to the divided curvature. And the array element position submodule is used for calculating the real position of each array element according to the curvature, the array length and the element azimuth angle.
For specific limitations of the radiation characteristic correction system 100 for a curved array, reference may be made to the corresponding limitations of the radiation characteristic correction method for a curved array, and details are not repeated here. The various modules in the system 100 for correcting radiation characteristics of a curved array described above may be implemented in whole or in part by software, hardware, and combinations thereof. The modules may be embedded in hardware or independent from a device with specific data processing functions, or may be stored in a memory of the device in software, so that the processor may invoke and execute operations corresponding to the modules, where the device may be, but is not limited to, various antenna signal processing devices or onboard systems known in the art.
In still another aspect, there is provided a signal processing apparatus including a memory and a processor, the memory storing a computer program, the processor implementing the following processing steps when executing the computer program: determining two array elements on the curved-surface array which are closest to the center of the array as correction base points; calculating the array element projection position of each array element on the projected curved surface array based on the correction base point; the array element spacing on the projected curved surface array is the same as the array element spacing on the equal-length uniform planar array; acquiring the real position of each array element on the curved surface array; calculating the difference between the real position of each array element and the projection position of the corresponding array element to obtain the projection position error of each array element on the curved surface array; and carrying out phase compensation processing on the directional diagram of the curved surface array by using the projection position error of each array element to obtain the directional diagram of the curved surface array after radiation characteristic correction.
It should be noted that the signal processing device may be various antenna signal processing devices in the art, including an onboard device and an off-board device, which in addition to the core components such as the memory and the processor, those skilled in the art will understand that the signal processing device may also include other components not listed in the present specification, which may be determined according to the model of the specific device.
In one embodiment, the processor when executing the computer program may further implement the additional steps or sub-steps of the radiation characteristic correction method for the curved surface array.
In yet another aspect, a computer-readable storage medium is provided, on which a computer program is stored, wherein the computer program, when executed by a processor, implements the following processing steps: determining two array elements closest to the center of the array on the curved-surface array as a correction base point; calculating the array element projection position of each array element on the projected curved surface array based on the correction base point; the array element spacing on the projected curved surface array is the same as the array element spacing on the equal-length uniform planar array; acquiring the real position of each array element on the curved surface array; calculating the difference between the real position of each array element and the projection position of the corresponding array element to obtain the projection position error of each array element on the curved surface array; and carrying out phase compensation processing on the directional diagram of the curved surface array by using the projection position error of each array element to obtain the directional diagram of the curved surface array after radiation characteristic correction.
In one embodiment, the computer program, when executed by the processor, may further implement the additional steps or sub-steps of the radiation characteristic correction method for a curved surface array described above.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), synchronous link DRAM (Synchlink) DRAM (SLDRAM), Rambus DRAM (RDRAM), and interface DRAM (DRDRAM).
All possible combinations of the technical features in the above embodiments may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the concept of the present application, several variations and modifications can be made without departing from the spirit of the present application. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (10)
1. A method for correcting radiation characteristics of a curved array, comprising the steps of:
determining two array elements on the curved-surface array which are closest to the center of the array as correction base points;
calculating the array element projection position of each array element on the curved surface array after projection based on the correction base point; after projection, the array element spacing on the curved surface array is the same as the array element spacing on the equal-length uniform planar array;
acquiring the real position of each array element on the curved surface array;
calculating the difference between the real position of each array element and the projection position of the corresponding array element to obtain the projection position error of each array element on the curved surface array;
and carrying out phase compensation processing on the directional diagram of the curved surface array by using the projection position error of each array element to obtain the directional diagram of the curved surface array after radiation characteristic correction.
2. The method of claim 1, wherein the step of obtaining the true array element position of each array element on the curved array comprises:
acquiring the curvature and the array length of the curved surface array, and performing equidistant segmentation processing on the curvature;
determining element azimuth angles corresponding to the array elements on the curved surface array according to the divided curvatures;
and calculating to obtain the real position of each array element according to the curvature, the array length and the element azimuth angle.
3. The method of claim 2, wherein the true position of the array element is calculated by the following formula:
xm＝r*sin(α)
ym＝r*[1-cos(α)]
wherein x ismRepresenting the x-axis coordinate, y, of each array element on the curved array in a rectangular coordinate systemmThe array element number of the curved surface array is represented by M, M and M, wherein M is 1, 2.
Wherein r is L1/q，L1Representing an array length of the curved array, q representing a curvature of the curved array;
wherein α is q/M-q/2.
4. The radiation characteristic correction method for a curved surface array according to any one of claims 1 to 3, wherein the radiation characteristic-corrected directivity pattern of the curved surface array is calculated by the following formula:
wherein, PimproveRepresenting the radiation characteristic corrected directional diagram of the curved surface array, M representing the array element number of the curved surface array, k representing the wave number, xmRepresenting the x-axis coordinate, y, of each array element on the curved array in a rectangular coordinate systemmAnd the y-axis coordinate of each array element on the curved surface array in the rectangular coordinate system is represented, theta represents an azimuth angle, and D represents the projection position error.
5. The method of claim 4, wherein the projected positions of the array elements of each array element on the curved array after projection are calculated by the following formula:
wherein m represents a left side calibration base point on the curved array closest to the array center, m +1 represents a left side calibration base point on the curved array closest to the array center, and l represents an array element interval.
6. The method of claim 4, wherein the projection position error of each array element on the curved array is calculated by the following formula:
wherein m represents the m-th array element on the curved array,
and representing the x-axis coordinate of the projection position of the array element corresponding to the array element m in the rectangular coordinate system.
7. A system for correcting radiation characteristics of a curved array, comprising:
the base point determining module is used for determining two array elements closest to the center of the array on the curved surface array as correction base points;
the projection position module is used for calculating the array element projection position of each array element on the curved surface array after projection based on the correction base point; after projection, the array element spacing on the curved surface array is the same as the array element spacing on the equal-length uniform planar array;
an array element position module, configured to obtain an actual position of each array element on the curved-surface array;
the projection error module is used for calculating the difference between the real position of each array element and the projection position of the corresponding array element to obtain the projection position error of each array element on the curved surface array;
and the compensation processing module is used for carrying out phase compensation processing on the directional diagram of the curved surface array by utilizing the projection position error of each array element to obtain the directional diagram of the curved surface array after radiation characteristic correction.
8. The system of claim 7, wherein the array element position module comprises:
the array parameter submodule is used for acquiring the curvature and the array length of the curved surface array and performing equidistant segmentation processing on the curvature;
an array element azimuth submodule for determining an element azimuth angle corresponding to each array element on the curved surface array according to the divided curvature;
and the array element position submodule is used for calculating the real position of each array element according to the curvature, the array length and the element azimuth angle.
9. A signal processing apparatus comprising a memory and a processor, the memory storing a computer program, characterized in that the processor when executing the computer program realizes the steps of the method for radiation characteristic correction of curved surface arrays according to any one of claims 1 to 6.
10. A computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method for radiation characteristic correction of a curved array according to any one of claims 1 to 6.
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