CN114740277B - Method and system for correcting radiation characteristics of curved surface array - Google Patents

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 closest to the center of the array on the curved surface array as correction base points; calculating the array element projection positions of each array element on the projected curved surface array based on the correction base points; the array element spacing on the projected curved surface array is the same as the array element spacing on the equal-length uniform plane array; acquiring the real position of each array element on the curved surface array; calculating the difference between the actual 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 utilizing the projection position errors of the array elements to obtain the directional diagram of the curved surface array after the radiation characteristic correction. By adopting the improved projection method, the phase compensation of the uniform curved surface array with any curvature can be realized, the array directional diagram close to the performance of the planar array is obtained, and the phase compensation effect of the curved surface array antenna is remarkably improved.

Description

Radiation characteristic correction method and system for curved array

Technical Field

The invention belongs to the technical field of antenna signal processing, and relates to a radiation characteristic correction method and system for a curved array.

Background Art

With the continuous development of antenna technology, different types of antennas emerge in an endless stream and are widely used in various high-tech fields. Conformal Antenna Array (CAA) refers to an antenna array that is consistent with the shape of an object, that is, each array unit is distributed on the surface of the electronic system carrier and the array surface is in line with the shape of the carrier platform. This type of antenna is also called a conformal array. Compared with traditional planar array antennas, conformal array antennas can not only meet the performance requirements of the antenna itself, but also take into account the aerodynamic characteristics of the carrier. In addition, due to the special location of the antenna installation, the space utilization rate in the carrier is improved to a certain extent. In addition, conformal array antennas are distributed in three-dimensional space, which correspondingly improves the airspace coverage range. The many advantages of conformal array antennas have made it a research hotspot in the antenna field. It has received widespread attention in related fields such as radar, communication and navigation, and is the main direction of future antenna development.

The radiation characteristic correction (array manifold error correction) of conformal array antennas is the key technical foundation for the application and development of conformal array antennas. At present, phase compensation methods are usually used for correction, including array element connection phase compensation method, radial phase compensation method and Z-direction phase compensation method, among which Z-direction phase compensation method is the most widely used, and Z-direction phase compensation method is also called projection method. Curved array antenna is a typical conformal array antenna. However, in the process of realizing the present invention, the inventor found that the traditional projection method still has the technical problem of poor phase compensation effect in the face of the radiation characteristic correction problem of curved array antennas.

Summary of the invention

In response to the problems existing in the above-mentioned traditional methods, the present invention proposes a radiation characteristic correction method for a curved array and a radiation characteristic correction system for a curved array, and also provides a signal processing device and a computer-readable storage medium, which can significantly improve the phase compensation effect of the curved array antenna.

In order to achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

On the one hand, a method for calibrating radiation characteristics of a curved array is provided, comprising the steps of:

Determine the two array elements closest to the center of the curved array as calibration base points;

The projection position of each array element on the curved array after projection is calculated based on the correction base point; the array element spacing on the curved array after projection is the same as the array element spacing on the uniform plane array of equal length;

Obtain the true position of each array element on the curved array;

By calculating the difference between the real position of each array element and the projection position of the corresponding array element, the projection position error of each array element on the curved array is obtained;

The projection position error of each array element is used to perform phase compensation processing on the directional pattern of the curved array to obtain the directional pattern of the curved array after the radiation characteristics are corrected.

On the other hand, a radiation characteristic correction system for a curved array is also provided, comprising:

A base point determination module is used to determine two array elements on the curved array that are closest to the array center as calibration base points;

A projection position module is used to calculate the projection position of each array element on the curved array after projection based on the correction base point; the array element spacing on the curved array after projection is the same as the array element spacing on the uniform plane array of equal length;

An array element position module is used to obtain the true position of each array element on the curved array;

A projection error module is used to obtain the projection position error of each array element on the curved array by calculating the difference between the real position of each array element and the projection position of the corresponding array element;

The compensation processing module is used to perform phase compensation processing on the directional pattern of the curved array by using the projection position error of each array element to obtain the directional pattern of the curved array after the radiation characteristics are corrected.

On the other hand, a signal processing device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above-mentioned method for correcting the radiation characteristics of the curved array when executing the computer program.

On the other hand, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above-mentioned method for correcting the radiation characteristics of a curved array are implemented.

One of the above technical solutions has the following advantages and beneficial effects:

The above-mentioned method and system for correcting the radiation characteristics of the curved array adopts an improved projection method, that is, the array element position close to the center of the curved array is used as the correction reference, and the array element projection position of the remaining array elements is calculated by the array element spacing, and then the position difference between the actual array element position of each array element on the curved array and the array element projection position of the corresponding array element after projection using the improved projection method is calculated, and finally the obtained projection position error is used to perform phase compensation processing on the directional pattern of the curved array to obtain the directional pattern after the radiation characteristics are corrected. In this way, the above-mentioned scheme has the characteristics of a wider application range and better phase compensation effect in uniform curved arrays, and can realize phase compensation of uniform curved arrays with arbitrary curvature to obtain an array directional pattern close to the performance of a planar array, thereby significantly improving the phase compensation effect of the curved array antenna.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a diagram of array signal transmission in one embodiment;

FIG2 is a schematic flow chart of a method for calibrating radiation characteristics of a curved array in one embodiment;

FIG3 is a schematic diagram showing the relationship between array element m and curvature angle on a curved array in one embodiment;

FIG4 is a schematic diagram of array element projection of a traditional projection method;

FIG5 is a schematic diagram showing a comparison of array element projections between an improved projection method and a traditional projection method in one embodiment;

FIG6 is a schematic diagram of the directional diagram of the curved array before and after phase compensation when M=64 and q=π/2 in one embodiment;

FIG7 is a schematic diagram of the front and rear directional diagrams of the curved array phase compensation when M=64 and q=2*π/3 in one embodiment;

FIG8 is a schematic diagram of the front and rear directional diagrams of the curved array phase compensation when M=64 and q=π in one embodiment;

FIG9 is a schematic diagram of the integrated sidelobe ratios of various states under different curvatures in one embodiment;

FIG10 is a schematic diagram of RMSE variation curves of two methods as curvature increases in one embodiment;

FIG. 11 is a schematic diagram of the module structure of a radiation characteristic correction system for a curved array in one embodiment.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and/or" used herein includes any and all combinations of one or more related listed items.

The following will describe the implementation of the present invention in detail with reference to the accompanying drawings in the embodiment diagram of the present invention.

Curved array antennas are a typical conformal array antenna. When a uniform planar array antenna is used, the transmit and receive path difference between each array element and the center of the array is a geometric series, which can form a main lobe beam with good focusing performance when superimposed in space; but for curved array antennas, the transmit and receive path difference between each array element is no longer in a geometric relationship, which causes the main lobe performance of its radiation pattern to deteriorate seriously. In actual engineering applications, in order to make the radiation characteristics of the curved array antenna close to those of the planar array antenna and avoid the influence of array deformation on the radiation pattern performance, it is necessary to correct the deformation of the conformal array antenna. This is a technical issue with important research significance and a key factor restricting the development and application of conformal array antennas.

However, analysis has found that when the curvature of the curved array antenna is too high, the phase compensation effect of the traditional projection method will become poor and cannot meet the requirements of practical applications. Therefore, this application provides a new correction method (also called improved projection method) to address the technical problem of poor phase compensation effect when the traditional projection method is used to correct the radiation characteristics of the curved array antenna. The position of the array element close to the center of the curved array is used as the correction reference, and the positions of the remaining array elements are calculated using the array element spacing, thereby obtaining the corrected array pattern, so that it has a wider range of applications and better phase compensation effects in uniform curved arrays. It can realize phase compensation for uniform curved arrays with arbitrary curvatures to obtain an array pattern close to the performance of a planar array.

In order to facilitate the intuitive and detailed description of the following method, the following method is described in a rectangular coordinate system. Those skilled in the art can understand that the following method can also be applied in other coordinate systems, and the method can be applied in the same way by simply transforming the coordinate relationship (between coordinate systems) of the relevant parameters. Therefore, the following method is not limited to application in a rectangular coordinate system.

As shown in Figure 1, it is a schematic diagram of array signal transmission. In Figure 1, the number of array elements is M, where the interval between each array element of the uniform planar array is denoted as l, and they are distributed on the x-axis in an equidistant manner. Different from the traditional planar array, when the array substrate adopts a flexible variable material, the planar array can be deformed into a curved array with any curvature, as shown in curved array 1 and curved array 2 in Figure 1, respectively. Assuming that the curvatures of the two curved arrays are q ₁ and q ₂ (q ₁ >q ₂ ), the larger the curvature q, the greater the curvature of the curved array. When the azimuth angle is θ, the array pattern distribution formed by the superposition of each array element in space can be expressed as:

Wherein, _xm and _ym are the x-axis coordinate and y-axis coordinate corresponding to the m-th array element, respectively, m=1,2,...,M; k=2πf/c is the wave number, f is the frequency of the transmitted signal, and c is the speed of light.

For a planar array, the coordinates _ym of each array element are all set to zero, and 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, comprising the following steps S12 to S20:

S12, determining two array elements on the curved array that are closest to the array center as calibration base points.

It can be understood that the array center refers to the midpoint of the arc of the curved array. Therefore, the correction base point is the two array elements (positions) on both sides of the midpoint of the arc of the curved array that are closest to the midpoint.

S14, calculating the projection position of each array element on the curved array after projection based on the correction base point; the array element spacing on the curved array after projection is the same as the array element spacing on the uniform plane array of equal length.

It can be understood that the uniform plane array of equal length refers to a uniform plane array with the same array length as the curved array, and the same number of array elements can be distributed on the two arrays within the array length. Therefore, the projection plane of the curved array can be set to the plane where the uniform plane array of equal length is located or the x-axis plane.

S16, obtaining the true position of each array element on the curved array.

It can be understood that the real position of each element refers to the position coordinate of each element on the curved array in the current coordinate system. The real position of each element can be provided in advance, or can be directly measured and read from the coordinate system by the carrier device or obtained by other means.

In one embodiment, the above step S16 includes:

Obtain the curvature and array length of the curved array, and perform equal-interval segmentation processing on the curvature;

Determine the element azimuth corresponding to each array element on the curved array according to the segmented curvature;

The true position of each array element is calculated based on the curvature, array length and element azimuth.

It can be understood that for the curved array, the arc model is used to fit the array curvature and the corresponding position coordinates _xm and _ym of each array element, as shown in FIG3. The curvature value q corresponding to the curved array is set. Since it is a uniform curved array (a non-uniform curved array can also be processed by dividing it into multiple uniform curved arrays), the curvature is divided into M parts with equal spacing, and the angle corresponding to the array element m (that is, the element azimuth angle mentioned above) can be recorded 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, _xm represents the x-axis coordinate of each element on the curved array in the rectangular coordinate system, _ym represents the y-axis coordinate of each element on the curved array in the rectangular coordinate system, r represents the radius of the circle where the curved array is located, α represents the element azimuth, m=1,2,...,M, and M represents the number of elements in the curved array.

Specifically, when the curved array is deformed, the array length remains unchanged, 1 is L ₁ =(M-1)*l, L ₁ is the arc length in Figure 2, and the radius of the circle is recorded as r=L ₁ /q, then the values of x _m and y _m can be calculated by formula (4).

As shown in FIG. 4 , it can be seen that the higher the curvature of the planar array, the greater the surface distortion, and the greater the position difference between each element on the deformed curved array and the corresponding element in the planar array, as shown by the position difference X' corresponding to the curved array with a small curvature and the position difference X" corresponding to the curved array with a large curvature; and after the planar array is curved, the positions of the two elements close to the center of the array are generally relatively small compared with the original positions. Therefore, the position of the element close to the center of the array is used as the correction reference, and the positions of the remaining elements can be calculated by the element interval l, thereby obtaining the corrected array pattern. Among them, element n is the element in the array.

In one embodiment, the projection position of each array element on the curved array after projection is calculated by the following formula:

Wherein, m represents the left correction base point closest to the array center on the curved array, m+1 represents the left correction base point closest to the array center on the curved array, and l represents the array element spacing.

Specifically, the two array elements closest to the center of the curved array are selected as base points, as shown in FIG5 , assuming that the two array elements closest to the center of the array are array element m and array element m+1, respectively, when the improved projection method is used, the spacing between the array elements (array element distance) after projection is kept the same as that of the uniform plane array, then the array element projection position coordinates of the remaining array elements can be calculated by the above formula (5). As shown in FIG5 , a schematic diagram of the positions of array element m-1, array element m+1, and array element m+2 adjacent to array element m after projection is given.

S18, obtaining the projection position error of each array element on the curved array by calculating the difference between the actual position of each array element and the projection position of the corresponding array element.

It can be understood that after obtaining the true position of each array element on the curved array and the projection position of the array element after projection, the projection position error of each array element can be calculated respectively.

In one embodiment, the projection position error of each array element on the curved array is calculated by the following formula:

Where m represents the mth array element on the curved array. Represents the x-axis coordinate of the projection position of the array element corresponding to the array element m in the rectangular coordinate system.

Since the projection part does not need to consider the position coordinates in the y-axis direction, the projection position error data of each array element can be quickly obtained through the above position error calculation method.

S20, performing phase compensation processing on the directional pattern of the curved array using the projection position error of each array element, to obtain the directional pattern of the curved array after the radiation characteristic is corrected.

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 item for calculating the directivity pattern of the curved array to obtain a corrected directivity pattern.

In one embodiment, the radiation pattern of the curved array after radiation characteristic correction is calculated by the following formula:

Wherein, P _improve represents the radiation pattern of the curved array after radiation characteristic correction, M represents the number of array elements of the curved array, k represents the wave number, x _m represents the x-axis coordinate of each array element on the curved array in the rectangular coordinate system, y _m represents the y-axis coordinate of each array element on the curved array in the rectangular coordinate system, θ represents the azimuth, and D represents the projection position error.

Specifically, the position error of each array element is calculated and then phase compensation is performed on the curved array pattern through the above formula (7).

As shown in Figure 5, the solid arrow is the trajectory of the array element position change corresponding to the improved projection method, and the dotted arrow is the trajectory of the array element position change corresponding to the traditional projection method. The traditional projection method performs phase compensation by directly setting the coordinates of each array element on the curved array in the y-axis direction to zero. At this time, the calculation formula for the directional pattern received from the curved array at the target position P is:

It can be seen that the phase compensation method under the improved projection method adopted in this application is essentially different.

The above-mentioned method for correcting the radiation characteristics of the curved array adopts an improved projection method, that is, the array element position close to the center of the curved array is used as the correction reference, and the array element projection position of the remaining array elements is calculated by the array element spacing, and then the position difference between the actual array element position of each array element on the curved array and the array element projection position of the corresponding array element after projection using the improved projection method is calculated, and finally the obtained projection position error is used to perform phase compensation processing on the directional pattern of the curved array to obtain the directional pattern after the radiation characteristics are corrected. In this way, the above-mentioned scheme has the characteristics of a wider application range and better phase compensation effect in uniform curved arrays, and can realize phase compensation of uniform curved arrays with arbitrary curvature to obtain an array directional pattern close to the performance of a planar array, thereby significantly improving the phase compensation effect of the curved array antenna.

In one embodiment, in order to more intuitively and comprehensively illustrate the radiation characteristic correction method of the curved array mentioned above, the following is an example of simulation application and comparative explanation of the radiation characteristic correction method of the curved array proposed in the present invention, taking a certain type of curved array as an example.

It should be noted that the implementation cases given in this specification are only for illustration and are not the sole limitation for the specific implementation cases of the present invention. Those skilled in the art can, under the guidance of the implementation cases provided by the present invention, adopt the radiation characteristic correction method of the curved array provided above to realize the simulation application of different curved arrays.

Set the number of array elements to M = 64, the frequency of the transmitted signal to f = 5.68 GHz, the array element spacing to l = λ/2, λ = c/f is the wavelength, and the angular range of the pattern θ∈[-90°, 90°]. When simulating the curved array pattern, the curvatures are q = π/2, q = 2*π/3, and q = π, respectively, where q = 0 represents that the array is in a planar array state, and the other q values that increase in sequence represent three types of curved arrays with increasingly severe curvature.

As shown in Figures 6 to 8, the planar array pattern, the original curved array pattern, and the array pattern after compensation by two phase compensation methods (the traditional method and the above method of the present application) at different q values when M = 64 and l = 0.05 are drawn. As shown in Figure 6, when the value of q is small, that is, when the curvature of the curved array is smaller than that of the planar array, the compensation effects of the two projection methods for the main lobe and several adjacent side lobes are different but not large. For the side lobe compensation effect far away from the main lobe, the improved projection method is better than the traditional projection method. Therefore, in the case of low curvature, both the phase compensation projection method and the traditional improved projection method can be used for the curved array.

As shown in Figure 7, the advantages of the improved projection method proposed in this application gradually emerge, especially in the comparison of Figures 6 to 8, it can be clearly seen that as the curvature increases, the phase compensation effect of the improved projection method is significantly better than the traditional projection method. After the traditional projection method performs phase compensation, its directional pattern is much different from the waveform sidelobes of the planar array directional pattern, while the curved array directional pattern after phase compensation of the improved projection method is basically consistent with the planar array waveform. Therefore, in the case of a high curvature curved surface, using the improved projection method for phase compensation is a better choice.

In order to further compare the performance of the improved projection method proposed in this application with the traditional projection method, the integrated sidelobe ratio (ISLR) and root mean square error (RMSE) of the array pattern were calculated:

The comparison results of ISLR and RMSE are shown in Figures 9 and 10 respectively. From Figure 9, it can be found that under different curvatures, the integral sidelobe ratio of the directional pattern after compensation by the improved projection method is very close to the original planar array, while the integral sidelobe ratio of the directional pattern after phase compensation by the traditional projection method gradually increases with the curvature. From Figure 10, it can be seen that as the curvature increases, the overall trend of RMSE of the projection method is getting larger and larger, but the RMSE value of the improved projection method is still in a very small range. Therefore, the effect of the improved projection method is better than that of the traditional projection method, and as the curvature increases, the compensation effect of the traditional projection method rapidly deteriorates.

Combining the analysis results of ISLR and RMSE, it can be concluded that: when the curvature increases, although the main lobe focusing performance is similar, the side lobe performance of the traditional projection method deteriorates seriously, resulting in a larger gap between the ISLR value of the curved array pattern and that of the planar array after phase compensation, and the RMSE value also continues to increase. In comparison, the improved projection method can simultaneously guarantee good main lobe performance and side lobe performance, and the pattern compensation effect is significantly better than the traditional projection method.

It should be understood that, although the various steps in the flowchart of FIG. 1 are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear description in this article, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a part of the steps of FIG. 1 may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the sub-steps or stages of other steps.

Please refer to FIG. 11. In one embodiment, a radiation characteristic correction system 100 for a curved array is also provided, comprising 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 determination module 11 is used to determine the two array elements closest to the center of the curved array as the correction base points. The projection position module 13 is used to calculate the array element projection position of each array element on the curved array after projection based on the correction base points; the array element spacing on the curved array after projection is the same as the array element spacing on the uniform plane array of equal length. The array element position module 15 is used to obtain the true array element position of each array element on the curved array. The projection error module 17 is used to obtain the projection position error of each array element on the curved array by calculating the difference between the true position of each array element and the projection position of the corresponding array element. The compensation processing module 19 is used to perform phase compensation processing on the directional pattern of the curved array using the projection position error of each array element to obtain the directional pattern of the curved array after the radiation characteristic correction.

The above-mentioned curved array radiation characteristic correction system 100, through the cooperation of various modules, adopts an improved projection method, that is, the array element position close to the center of the curved array is used as the correction reference, and the array element projection position of the remaining array elements is obtained by calculating the array element spacing, and then the position difference between the actual array element position of each array element on the curved array and the array element projection position of the corresponding array element after projection using the improved projection method is calculated, and finally the obtained projection position error is used to perform phase compensation processing on the directional pattern of the curved array to obtain the directional pattern after radiation characteristic correction. In this way, the above-mentioned scheme has the characteristics of a wider application range and better phase compensation effect in uniform curved arrays, and can realize phase compensation of uniform curved arrays with arbitrary curvature to obtain an array directional pattern close to the performance of a planar array, thereby significantly improving the phase compensation effect of the curved array antenna.

In one embodiment, the array element position module 15 includes an array parameter submodule, an array element orientation submodule and an array element position submodule. The array parameter submodule is used to obtain the curvature and array length of the curved array and perform equal-interval segmentation processing on the curvature. The array element orientation submodule is used to determine the element azimuth angle corresponding to each array element on the curved array according to the segmented curvature. The array element position submodule is used to calculate the true array element position of each array element according to the curvature, the array length and the element azimuth angle.

For the specific definition of the radiation characteristic correction system 100 for curved arrays, please refer to the corresponding definition of the radiation characteristic correction method for curved arrays above, which will not be repeated here. Each module in the above-mentioned radiation characteristic correction system 100 for curved arrays can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of a device with a specific data processing function in the form of hardware, or can be stored in the memory of the aforementioned device in the form of software, so that the processor can call and execute the operations corresponding to the above modules. The aforementioned device can be, but is not limited to, various types of antenna signal processing devices or airborne systems already available in the art.

On the other hand, a signal processing device is also provided, including a memory and a processor, the memory storing a computer program, and the processor implementing the following processing steps when executing the computer program: determining the two array elements on the curved array closest to the array center as correction base points; calculating the array element projection position of each array element on the curved array after projection based on the correction base points; the array element spacing on the curved array after projection is the same as the array element spacing on the equal-length uniform plane array; obtaining the true array element position of each array element on the curved array; obtaining the projection position error of each array element on the curved array by calculating the difference between the true position of each array element and the projection position of the corresponding array element; and performing phase compensation processing on the directional pattern of the curved array using the projection position error of each array element to obtain the directional pattern of the curved array after the radiation characteristics are corrected.

It should be noted that the above-mentioned signal processing device can be various types of antenna signal processing devices in the field, including airborne and non-airborne devices. In addition to the core components such as the above-mentioned memory and processor, technical personnel in this field can understand that it can also include other components not listed in detail in this specification, which can be determined according to the specific device model.

In one embodiment, when the processor executes the computer program, the processor may also implement the steps or sub-steps added in the above-mentioned embodiments of the method for correcting the radiation characteristics of the curved array.

On the other hand, a computer-readable storage medium is provided, on which a computer program is stored, characterized in that when the computer program is executed by a processor, the following processing steps are implemented: two array elements on the curved array closest to the center of the array are determined as correction base points; the array element projection position of each array element on the curved array after projection is calculated based on the correction base points; the array element spacing on the curved array after projection is the same as the array element spacing on the uniform plane array of equal length; the array element true position of each array element on the curved array is obtained; the projection position error of each array element on the curved array is obtained by calculating the difference between the true position of each array element and the projection position of the corresponding array element; and the projection position error of each array element is used to perform phase compensation processing on the directional pattern of the curved array to obtain the directional pattern of the curved array after the radiation characteristics are corrected.

In one embodiment, when the computer program is executed by a processor, it can also implement the steps or sub-steps added in the above-mentioned embodiments of the method for correcting the radiation characteristics of a curved array.

Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and/or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus dynamic random access memory (Rambus DRAM, referred to as RDRAM) and interface dynamic random access memory (DRDRAM).

The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and all of them belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims (10)

1. A method for calibrating the radiation characteristics of a curved array, comprising the steps of: Determine the two array elements closest to the center of the curved array as calibration base points; Calculating the projection position of each array element on the curved array after projection based on the correction base point; the array element spacing on the curved array after projection is the same as the array element spacing on the uniform plane array of equal length; Obtaining the true position of each array element on the curved array; By calculating the difference between the real position of each array element and the corresponding projection position of the array element, the projection position error of each array element on the curved array is obtained; The projection position error of each array element is used to perform phase compensation processing on the directional pattern of the curved array to obtain the directional pattern of the curved array after the radiation characteristic is corrected. 2. The method for calibrating the radiation characteristics of a curved array according to claim 1, wherein the step of obtaining the true position of each array element on the curved array comprises: Obtaining the curvature and array length of the curved array, and performing equal-interval segmentation processing on the curvature; Determine the element azimuth corresponding to each array element on the curved array according to the segmented curvature; The true position of each array element is obtained by calculation according to the curvature, the array length and the element azimuth. 3. The method for calibrating the radiation characteristics of a curved array according to claim 2, wherein the true position of the array element is calculated by the following formula: x _m = r*sin(α) y _m = r*[1-cos(α)] Wherein, _xm represents the x-axis coordinate of each array element on the curved array in the rectangular coordinate system, _ym represents the y-axis coordinate of each array element on the curved array in the rectangular coordinate system, r represents the radius of the circle where the curved array is located, α represents the element azimuth, m=1, 2, ..., M, and M represents the number of array elements of the curved array; Wherein, r=L ₁ /q, L ₁ represents the array length of the curved array, and q represents the curvature of the curved array; Among them, α=q/M*m-q/2. 4. The method for correcting the radiation characteristics of a curved array according to any one of claims 1 to 3, wherein the radiation pattern of the curved array after the radiation characteristics correction is calculated by the following formula: Wherein, P _improve represents the radiation pattern of the curved array after radiation characteristic correction, M represents the number of elements of the curved array, k represents the wave number, x _m represents the x-axis coordinate of each element on the curved array in the rectangular coordinate system, y _m represents the y-axis coordinate of each element on the curved array in the rectangular coordinate system, θ represents the azimuth, and D represents the projection position error. 5. The method for calibrating the radiation characteristics of a curved array according to claim 4, wherein the projection position of each array element on the curved array after projection is calculated by the following formula: Wherein, m represents the left correction base point on the curved array closest to the array center, m+1 represents the left correction base point on the curved array closest to the array center, and l represents the array element spacing. 6. The method for calibrating the radiation characteristics of a curved array according to 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 mth array element on the curved array, Represents 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 radiation characteristic correction system for a curved array, comprising: A base point determination module is used to determine two array elements on the curved array that are closest to the array center as calibration base points; A projection position module, used for calculating the projection position of each array element on the curved array after projection based on the correction base point; the array element spacing on the curved array after projection is the same as the array element spacing on the uniform plane array of equal length; An array element position module, used to obtain the true position of each array element on the curved array; A projection error module, used for obtaining a projection position error of each array element on the curved 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 is used to perform phase compensation processing on the directional pattern of the curved array by using the projection position error of each array element to obtain the directional pattern of the curved array after the radiation characteristic is corrected. 8. The radiation characteristic correction system of a curved array according to claim 7, wherein the array element position module comprises: An array parameter submodule, used to obtain the curvature and array length of the curved array, and perform equal-interval segmentation processing on the curvature; An array element azimuth submodule, used to determine the element azimuth corresponding to each array element on the curved array according to the segmented curvature; The array element position submodule is used to calculate the true position of each array element according to the curvature, the array length and the element azimuth. 9. A signal processing device, comprising a memory and a processor, wherein the memory stores a computer program, wherein the processor implements the steps of the method for correcting the radiation characteristics of a curved array as described in any one of claims 1 to 6 when executing the computer program. 10. A computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the steps of the method for correcting the radiation characteristics of a curved array according to any one of claims 1 to 6 are implemented.