Dynamic roll angle measurement method based on antenna intensity change trend

Abstract

The invention relates to the technical field of roll angle measurement, in particular to a dynamic roll angle measurement method based on an antenna intensity change trend, and the method comprises the steps: designing a phased array radar beam, carrying out the target tracking of a missile body, obtaining an expected signal in real time, and obtaining a receiving signal, reflected by an antenna on the missile body, of each array element after the signal is transmitted; calculating a disorder coefficient of each modal component; determining an interference coefficient of each array element at the current moment; determining a step length parameter of a minimum mean square algorithm at the current moment; based on the expected signal and the step length parameter, in combination with a minimum mean square algorithm, adjusting the beam direction of each array element transmitting signal in real time; and each array element performs signal emission according to the adjusted emission signal, and the roll angle of the projectile body is measured according to the condition that the intensity of the signal received by the antenna on the projectile body has a minimum value. According to the invention, the step length parameter in the least mean square algorithm is dynamically adjusted, and the precise measurement of the roll angle of the projectile body is improved.

Description

Technical Field

[0001] This application relates to the technical field of roll angle measurement, and specifically to a dynamic roll angle measurement method based on the change trend of antenna intensity. Background Art

[0002] Inertial navigation can calculate the attitude angle, speed, and position of a carrier in real time through accelerometers and gyroscopes. However, the solution of inertial navigation needs to obtain initial values to be completed. However, the high overload during the launch of a shell will cause serious damage to the gyroscope and accelerometer, and due to the high rotation accompanied by the high overload impact, it is almost difficult for the gyroscope to ensure the measurement accuracy of the angular velocity, resulting in the inability to accurately measure the roll angle.

[0003] When the traditional method dynamically measures the roll angle through the earth's magnetic field, it is necessary to align the initial value of the geomagnetic sensor, which is easily affected by the accuracy of the measuring device itself. And when the angle between the shell firing direction and the local earth's magnetic field direction is small, it will cause a large error in the determination of the initial value of the roll angle, resulting in a low measurement accuracy of the roll angle of the projectile body. Summary of the Invention

[0004] In order to solve the above technical problems, a dynamic roll angle measurement method based on the change trend of antenna intensity is provided to solve the existing problems.

[0005] The solution of this application to solve the technical problem is to provide a dynamic roll angle measurement method based on the change trend of antenna intensity, including the following steps: Design a phased array radar beam to track the target of the projectile body, obtain the desired signal in real time, and obtain the received signal reflected by the antenna on the projectile body for each element after the signal is transmitted; Perform modal decomposition on the received signal of each element at the current moment, analyze the degree of dispersion of the amplitudes in each modal component, and the difference in the degree of dispersion of the amplitudes in different modal components, and calculate the disorder coefficient of each modal component; analyze the correlation degree of the received signals between each element and the remaining elements at the current moment, and the difference degree of the disorder coefficients of all modal components between each element and the remaining elements, and determine the interference coefficient of each element at the current moment; Based on the interference coefficients of all elements at the current moment, determine the step size parameter of the least mean square algorithm at the current moment; based on the desired signal and the step size parameter, combine the least mean square algorithm to adjust the beam direction of the transmitted signal of each element in real time; Each element emits a signal with the adjusted transmitted signal, and measures the roll angle of the projectile body when the signal intensity received by the antenna on the projectile body shows a minimum value.

[0006] Preferably, the degree of dispersion is the coefficient of variation of all amplitudes of each modal component.

[0007] Preferably, calculating the disorder coefficient of each modal component includes: Calculating the sum of the differences in the degree of discreteness between all any two modal components corresponding to each array element at the current moment, denoted as the relative difference degree; Performing positive fusion on the degree of discreteness and the relative difference degree to obtain the disorder coefficient of each modal component.

[0008] Preferably, the further determination process of the positive fusion is: calculating the product of the degree of discreteness and the relative difference degree.

[0009] Preferably, the further measurement process of the correlation degree is: calculating the Pearson correlation coefficient of the received signals between each array element and the remaining array elements at the current moment.

[0010] Preferably, the further measurement process of the degree of difference is: calculating the metric distance of the disorder coefficients of all modal components between each array element and the remaining array elements at the current moment.

[0011] Preferably, determining the interference coefficient of each array element at the current moment includes: Calculating the ratio between the metric distance and the absolute value of the Pearson correlation coefficient; Taking the fusion result of the ratios between each array element and all the remaining array elements at the current moment as the interference coefficient of each array element at the current moment.

[0012] Preferably, the further measurement method of the fusion result is: calculating the cumulative sum of the ratios between each array element and all the remaining array elements at the current moment.

[0013] Preferably, determining the step size parameter of the least mean square algorithm at the current moment includes: Normalizing the interference coefficients of all array elements at the current moment and calculating the average value of all the normalization results; The step size parameter of the least mean square algorithm at the current moment The calculation formula is: , where is the preset minimum step size parameter, is the difference between the preset maximum step size parameter and the preset minimum step size parameter, is the average value.

[0014] Preferably, measuring the roll angle of the projectile includes: when the signal intensity received by the antenna is at the minimum point, establishing a polar coordinate system with the center of the radar beam as the origin to obtain the position coordinates of the center of the circle of the projectile; calculating the antenna angle according to the position coordinates and the radius of the projectile; obtaining the roll angle of the projectile based on the antenna angle corresponding to the minimum point of the signal intensity received by the antenna.

[0015] The present application has at least the following beneficial effects: Based on the variation of the amplitudes of the received signals of each element in the phased array radar within different frequency ranges, the present application calculates the disorder coefficient of each modal component. The beneficial effect lies in considering the fluctuations of the received signals within different frequency ranges, thereby indicating the degree of interference of the received signals at that frequency. Secondly, based on the differential variation of the disorder coefficients between different elements, the interference coefficient of each element at the current moment is calculated. The beneficial effect lies in considering the interference situation of the signal of this element in the beam directivity. Based on the degree of interference received by different elements, the step size parameter of the least mean square algorithm at the current moment is determined. Combining with the least mean square algorithm, the beam direction of the transmitted signal of each element is adjusted in real time, so that the beam direction of the transmitted signal of each element points to the beam direction of the desired signal. The beneficial effect lies in determining the step size parameter based on the interference of the signals of all elements, continuously adjusting the amplitude and phase of the received signals of all elements, so that the beam direction of the received signal of each element is consistent with the beam direction of the desired signal. Each element transmits with the adjusted signal, and when the signal intensity received by the antenna on the projectile reaches the minimum value, the roll angle of the projectile is measured. The beneficial effect lies in that the measurement of the roll angle does not depend on the earth's magnetic field environment, but only depends on the measurement of the signal reception of the ground phased array radar, with strong anti-interference ability. Compared with the traditional beam adjustment based on filtering adjustment technology, it can dynamically adjust the step size parameter in the least mean square algorithm based on the influence characteristics of the transmitted signal of each element in the phased array radar on the beam directivity, improve the control stability and accuracy of the beam direction, and by adjusting the amplitude and phase of the transmitted signals of different elements in real time, it is not necessary to measure the initial value of the roll angle, thus improving the accurate measurement of the roll angle of the projectile. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following further elaborates in detail the dynamic roll angle measurement method based on the antenna intensity change trend of the present application with reference to the drawings.

[0017] Figure 1 is the flowchart of the steps of the dynamic roll angle measurement method based on the antenna intensity change trend provided by the embodiment of the present application; Figure 2 is the phased array radar beam schematic diagram provided by the embodiment of the present application; Figure 3 is the flight schematic diagram of the projectile provided by the embodiment of the present application; Figure 4 is the projectile roll schematic diagram provided by the embodiment of the present application; Figure 5 is the flowchart of the steps of the method for obtaining the interference coefficient of each element provided by the embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] In order to make the objectives, technical solutions and advantages of this application more clear and understandable, the following further elaborates in detail on the dynamic roll angle measurement method based on the antenna strength change trend proposed in this application in combination with the accompanying drawings and implementation examples. It should be understood that the specific implementation examples described herein are only used to explain this application and are not used to limit this application.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs.

[0020] Please refer to Figure 1 , which shows the step flowchart of the dynamic roll angle measurement method based on the antenna strength change trend provided by an embodiment of this application. The method includes the following steps: Step 1, design a phased array radar beam, perform target tracking on the projectile body, obtain the desired signal in real time, and obtain the received signal reflected by the antenna on the projectile body for each array element after signal transmission.

[0021] Inertial navigation calculates the position and attitude of the projectile body through integral operations. However, the solution process of inertial navigation needs to determine the initial reference before calculating the position and attitude of the projectile body, and the initial reference is easily affected by the geomagnetic field error. Therefore, after the projectile body is launched, in order to avoid the error influence caused by inaccurate calibration of the initial reference, the phased array radar signal is adjusted through beamforming technology to measure the roll angle of the projectile body.

[0022] First, design a phased array radar beam. Specifically: by controlling the shape and the number of arrays of the phased array radar, design the beam shape as an axisymmetric shape, generate a beam width that meets the requirements, and ensure that the final generated beam cross-sectional shape is an axisymmetric figure.

[0023] In this embodiment, the radar beam is designed as an ellipse with the short axis as the horizontal axis and the long axis as the vertical axis. Among them, the radar beam is designed as an ellipse with a long axis of 2 and a short axis of 1.5. The circular radius of the cross-sectional circle of the projectile body is 1. Antennas are installed in pairs on the circular edge of the cross-sectional circle of the projectile body and numbered.

[0024] It should be noted that the schematic diagram of the phased array radar beam provided in this embodiment is as Figure 2 shown, where it rotates with the rotation of the projectile body. When the antenna rotates to the minimum value point of the antenna strength in Figure 2 , the signal strength of the antenna is the minimum value; Secondly, plan the flight path of the projectile, specifically: make the irradiation direction of the phased array radar consistent with the flight direction of the projectile. At the same time, when the projectile is flying forward, there is a certain offset between the center of its circular cross-section and the center of the radar beam. Such a design can make the intensity of the radar signal received by the antenna on the projectile show regular changes during the rotation process.

[0025] The flight schematic diagram of the projectile provided in this embodiment is as Figure 3 shown. Move the ellipse representing the beam upward so that the center of the ellipse corresponding to the beam does not overlap with the center of the projectile. Figure 3 The solved distance in it represents the intensity of the radar signal received by the antenna.

[0026] Finally, install the receiving antenna of the projectile. Install the receiving antennas of the phased array radar in pairs on the circular edge of the circular cross-section of the projectile and number them. Ensure that there is a clear mathematical relationship between the installation position of the antenna and the roll angle of the projectile. For example, taking a specific antenna position as a reference, a corresponding relationship between the roll angle and the antenna position can be established to facilitate calculating the roll angle according to the change of the signal intensity received by the antenna in the subsequent process.

[0027] The roll schematic diagram of the projectile provided in this embodiment is as Figure 4 shown. Taking the Figure 4 rotation process as an example, taking antenna 1 as a reference, the angle value of rotation around the center of the circular cross-section of the projectile is the same as the roll angle value of the projectile. When the projectile rotates clockwise, when the roll angle is near -90°, the order of the minimum values of the signal intensity of the antenna is antenna 1, antenna 2, that is, antenna 1 reaches the minimum value before antenna 2. When the roll angle is near 90°, the order of the minimum values of the signal intensity of the antenna is antenna 2, antenna 1, that is, antenna 2 reaches the minimum value before antenna 1. When the projectile rotates counterclockwise or the beam moves downward, the order of the minimum values of the signal intensity of the antenna is opposite. Therefore, when the roll angle rotates between -180° and 180°, the minimum values of the radar signal intensity received by the antenna have obvious order characteristics.

[0028] Based on the above analysis, during the flight of the projectile, the electronic control device in the projectile continuously acquires the intensity of the phased array radar signal received by the antenna. As the projectile rotates, the relative position between the antenna and the radar beam changes continuously, resulting in a corresponding change in the received signal intensity. The electronic control device records the signal intensity at different moments received by the antenna in real time; Secondly, during the flight of the projectile, different array elements in the phased array radar transmit radar signals, which are received by the antenna of the projectile. Then, the electronic control device in the projectile continuously obtains the intensity of the phased array radar signals received by the antenna. Each array element will receive the received signals reflected by the antenna. According to the received signals of different array elements in the phased array radar, the amplitudes and phases of the received signals corresponding to the array elements of different phased array radars are analyzed, and the beam width of the phased array radar during the dynamic roll angle measurement is adjusted in real time according to the analysis results.

[0029] By performing real-time target tracking on the projectile, the desired signal of the phased array radar is obtained in real time; It should be noted that the desired signal is the ideal received signal obtained by reflecting the transmitted signal of the radar by the target.

[0030] Thus, the received signals of different array elements of the phased array radar are obtained.

[0031] Step 2: Perform modal decomposition on the received signal of each array element at the current moment, analyze the degree of dispersion of the amplitudes in each modal component, and the difference in the degree of dispersion of the amplitudes in different modal components, and calculate the disorder coefficient of each modal component; analyze the correlation degree of the received signals between each array element and the remaining array elements at the current moment, and the difference degree of the disorder coefficients of all modal components between each array element and the remaining array elements, and determine the interference coefficient of each array element at the current moment.

[0032] During the flight of the projectile, the pointing mismatch between its antenna and the radar beam may occur due to maneuvers, rotations, or environmental disturbances. Adaptive beam control can adjust the beam direction in real time to keep the radar signal always aligned with the projectile antenna; secondly, the beam width of the phased array radar depends on the spatial superposition of the signals transmitted by each array element. The wider the in-phase superposition angle range, the wider the beam; otherwise, it is narrower. The change in the flight position of the projectile and environmental disturbances will increase the difference in the received signals of different array elements, affecting the stability of beam adjustment. Secondly, the positions of different array elements of the phased array radar relative to the interference source are different, resulting in disordered amplitude changes of the received signals in different frequency ranges. If only the overall difference in the received signals is used to adjust the weights of the amplitudes and phases of the array element signals, the stability of weight determination will have a large deviation, affecting the stability and accuracy of beam adjustment.

[0033] Furthermore, the flowchart of the steps for obtaining the interference coefficient of each array element provided in the embodiments of the present application is as Figure 5 shown.

[0034] Based on the above analysis, by analyzing the disordered change of the amplitudes of the received signals of each array element at the current moment in different frequency ranges, the disorder coefficient is calculated to evaluate the interference effect on the received signals of each array element. Specifically: Perform modal decomposition on the received signals of each array element at the current moment to obtain multiple modal components; In this embodiment, the variational mode decomposition algorithm is used for modal decomposition. Among them, the variational mode decomposition algorithm is a well-known technology and will not be elaborated here. As other implementation manners, implementers can adopt other methods of the prior art. For example, the empirical mode decomposition algorithm, etc. This embodiment does not make special restrictions on this.

[0035] Calculate the coefficient of variation of all amplitudes of each modal component; In this embodiment, the degree of dispersion is measured by calculating the coefficient of variation of all amplitudes of each modal component. The calculation method of the coefficient of variation is a well-known technology and will not be elaborated here.

[0036] It should be noted that due to the differences in the positions of the interference sources in the projectile relative to the phased array radar array elements, the received signals of each array element are affected by interference differently in different frequency ranges. Therefore, the greater the degree of dispersion, the greater the fluctuation degree of the amplitudes in the corresponding frequency range.

[0037] Calculate the sum of the differences in the degree of dispersion between all any two modal components corresponding to each array element at the current moment, which is denoted as the relative difference degree; In this embodiment, calculate the sum of the absolute values of the differences in the degree of dispersion between all any two modal components corresponding to each array element at the current moment, which is denoted as the relative difference degree; Take the product of the degree of dispersion of each modal component and the relative difference degree as the disorder coefficient of each modal component; It should be noted that the greater the relative difference degree, the greater the fluctuation difference of the amplitudes between the frequency ranges corresponding to different modal components, and the greater the obtained disorder coefficient, the greater the difference in the amplitude disorder change caused by the interference effect on this modal component.

[0038] Furthermore, when considering the received signals reflected by the same target received by different array elements, their received signals have a high correlation. Therefore, by analyzing the interference effects on the received signals of different array elements of the phased array radar, the influence of this interference on the beam directivity during the signal transmission process is evaluated. Therefore, calculate the interference coefficient of each array element during signal transmission, specifically: Calculate the metric distance of the disorder coefficients of all modal components between each array element and the other array elements at the current moment; In this embodiment, arrange all the modal components of each array element in ascending order according to the frequency range corresponding to the modal components. Then, the metric distance is measured by calculating the DTW distance of the disorder coefficients of all modal components between each array element and the other array elements. Among them, the calculation of the DTW distance is a well-known technology and will not be elaborated here.

[0039] Calculate the Pearson correlation coefficient of the received signals between each array element and the remaining array elements at the current moment; Calculate the ratio between the metric distance and the absolute value of the Pearson correlation coefficient, and take the sum of the ratios between each array element and all the remaining array elements at the current moment as the interference coefficient of each array element at the current moment; It should be noted that the larger the metric distance, the greater the interference effect on the received signal, resulting in a larger difference in the amplitude disorder change of the received signals between different array elements in different frequency ranges. The smaller the absolute value of the Pearson correlation coefficient, the lower the correlation between different array elements with respect to the same target due to the influence of the interference signal; the larger the obtained interference coefficient, the more serious the interference situation of the signal of this array element in the beam directivity.

[0040] Thus, the interference coefficient of each array element at the current moment is obtained.

[0041] Step 3: Based on the interference coefficients of all array elements at the current moment, determine the step size parameter of the least mean square algorithm at the current moment; based on the desired signal and the step size parameter, combine the least mean square algorithm to adjust the beam direction of the transmitted signal of each array element in real time.

[0042] Furthermore, based on the interference coefficient, combine the least mean square algorithm to determine the weight vector during the beam width adjustment process, and then adjust the amplitude and phase of the transmitted signals of different array elements.

[0043] First of all, the size of the step size parameter of the least mean square algorithm affects the algorithm convergence speed and stability. If the influence characteristics of the transmitted signals of each array element in the phased array radar on the beam directivity are more significant, a smaller step size parameter is set to ensure the beam control stability; if the influence characteristics of the transmitted signals of each array element in the phased array radar on the beam directivity are less significant, a larger step size parameter is set to improve the algorithm convergence speed and thus improve the beam control efficiency. Therefore, based on the interference coefficient, determine the step size parameter of the least mean square algorithm, specifically: Normalize the interference coefficients of all array elements in the phased array radar at the current moment, and calculate the average value of all the normalization results; In this embodiment, the maximum-minimum normalization method is used for normalization. Among them, the maximum-minimum normalization method is a well-known technology and will not be elaborated here. As other implementation manners, implementers can adopt other methods of existing technologies, such as the Z-Score method, etc. This embodiment does not make special restrictions on this.

[0044] The calculation formula for the step size parameter of the least mean square algorithm at the current moment is: Among them, is the step size parameter of the least mean square algorithm at the current moment, is the preset minimum step size parameter, is the difference between the preset maximum step size parameter and the preset minimum step size parameter, is the said average value.

[0045] In this embodiment, the preset minimum step size parameter is 0.001, and the preset maximum step size parameter is 0.1. As other implementation manners, the implementer can set them according to the actual situation.

[0046] Based on the step size parameter, through the least mean square algorithm, perform iterative operations on the received signals of all array elements to obtain the weight vector in real time; It should be noted that the least mean square algorithm is a well-known technology and will not be elaborated here. Secondly, the step process of the least mean square algorithm is as follows: Construct an initial weight vector, denoted as ; It should be noted that the initial weight vector is constructed by randomly assigning values to the elements in the initial weight vector, where the number of elements in the initial weight vector is equal to the number of all array elements.

[0047] Form an input vector from the signals received by all array elements of the phased array radar at the nth moment , after the signals received by all array elements are processed by weighted summation, the output signal of the array can be expressed as: , where, is the output signal of the array, represents the conjugate transpose of the initial weight vector ; Denote the desired signal at the nth moment as , calculate the error signal , that is , then ; It should be noted that the error signal reflects the difference between the output signal and the desired signal.

[0048] By continuously iterating, update the weight vector, and the iterative formula of the weight vector is: where, is the weight vector at the (n + 1)th moment, is the weight vector at the nth moment, is the step size parameter of the least mean square algorithm, is the input vector at the nth moment, is the conjugate transpose of the error signal at the nth moment; Furthermore, according to the weight vectors at each moment, the beam direction of the transmission signal of each array element is adjusted in real time so that the beam direction of the transmission signal of each array element points to the beam direction of the desired signal. Specifically: The th array element has the corresponding element in the weight vector at the current moment as , where is a complex number and can be expressed as: . Through Euler's formula, it is converted to polar coordinate representation as , where ; The received signal of the th array element at the current moment has the expression , where A represents the amplitude, is the angular frequency, is the time; Therefore, the adjusted transmission signal of the th array element at the current moment is: It should be noted that is the phase part. When the amplitude of the weight value corresponding to a certain array element is large, the transmission signal of this array element contributes more to the synthesized beam; otherwise, the contribution is small. By adjusting the amplitude , the shape and sidelobe level of the beam can be controlled, the signal intensity in the sidelobe region can be suppressed, and the radar's ability to resolve targets can be improved. According to the principle of phased array radar, by precisely controlling the phase difference between adjacent array elements, the beam direction can be controlled. When the beam needs to be pointed in a specific direction, according to the angle between this direction and the normal direction of the array, the phase value in the weight vector adjusts the phase of the transmission signal of each array element so that the signals interfere and superimpose in space to form a main lobe in the desired direction.

[0049] Secondly, when the weight vector changes, the amplitude and phase of the transmission signal of each array element change accordingly, resulting in a change in the interference situation of the signals in space. If the adjustment of the weight vector makes the transmission signals of each array element in-phase superimpose within a wider angular range, the beam width increases; if it makes the transmission signals of each array element in-phase superimpose within a narrower angular range, the beam width decreases, thus achieving effective control of the beam width.

[0050] Thus, the adjusted transmission signal of each array element at the current moment is obtained.

[0051] Step 4: Each array element emits signals with the adjusted transmitted signals. When the signal intensity received by the antenna on the projectile body shows a minimum value, measure the roll angle of the projectile body.

[0052] Furthermore, beamforming is achieved through the adjusted transmitted signals of each array element, so that the electronic control device in the projectile body continuously obtains the radar signals received by the paired antennas. Specifically: Each array element emits signals with the adjusted transmitted signals, and the electronic control device in the projectile body continuously obtains the radar signals received by the paired antennas; Due to the rotation of the projectile body, there is a sequential change in the radar signals received by the paired antennas. By recording the times when these extreme values occur, the relative position change of the antennas during the rotation of the projectile body can be obtained. Therefore, calculate the roll angle of the projectile body based on the time sequence of the extreme values of the radar signals received by the paired antennas.

[0053] First, based on the offset direction and magnitude between the center of the projectile body and the beam center, and the time sequence of the maximum and minimum values in the radar signals of the paired antennas, determine the angular value where the paired antennas are located. Specifically: Obtain the radius of the projectile body. When the signal intensity received by the antenna is at the minimum value point, establish a polar coordinate system with the center of the radar beam as the origin to obtain the position coordinates of the center of the projectile body. Calculate the antenna angle based on the position coordinates and the radius of the projectile body; In this embodiment, assume that the radius of the projectile body is r, and the position coordinates of the center of the projectile body are , when the signal intensity received by the antenna is at the minimum value, assume the antenna angle is , then , the antenna angle can be deduced from the radius of the projectile body and the position coordinates of the center of the projectile body .

[0054] According to the mathematical relationship between the installation position of the antenna on the projectile body and the roll angle of the projectile body, and combining the antenna angle, calculate the roll angle of the projectile body; thus, the measurement of the dynamic roll angle is achieved; In this embodiment, for example, taking antenna 1 as the reference, the angle of rotation around the center of the circular cross-section of the projectile body is the same value as the roll angle of the projectile body. When the signal intensity received by antenna 1 shows a minimum value, the corresponding antenna angle is equal to the roll angle of the projectile body at this time.

[0055] It should be understood that although Figure 1 the steps in the flowchart ofFigure 1 At least some of the steps in can include multiple sub-steps or multiple stages, and these sub-steps or stages do not necessarily need to be completed at the same moment, but can be executed at different moments, and the execution order of these sub-steps or stages does not necessarily need to be sequential, but can be executed alternately or in turns with at least some of the other steps or sub-steps or stages of the other steps.

[0056] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0057] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation to the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made. Therefore, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application all belong to the protection scope of the technical solution of the present application.

Claims

1. A dynamic roll angle measurement method based on antenna strength change trend, characterized in that: The method comprises the following steps: Design phased array radar beams to track the missile, obtain the desired signal in real time, and obtain the received signal of each array element reflected by the antenna on the missile after the signal is transmitted; Performing modal decomposition on the received signal of each array element at the current moment, analyzing the discrete degree of the amplitude in each modal component and the difference in the discrete degree of the amplitude in different modal components, and calculating the disorder coefficient of each modal component; analyzing the correlation degree of the received signal between each array element and the remaining array elements at the current moment, and the difference degree of the disorder coefficient of all modal components between each array element and the remaining array elements, and determining the interference coefficient of each array element at the current moment; Based on the interference coefficients of all array elements at the current moment, determine the step size parameter of the minimum mean square algorithm at the current moment; based on the expected signal and the step size parameter, in combination with the minimum mean square algorithm, adjust the beam direction of the signal transmitted by each array element in real time; Each array element transmits a signal with an adjusted transmission signal, and when the signal strength received by the antenna on the missile body reaches a minimum, the rolling angle of the missile body is measured.

2. The dynamic roll angle measurement method based on antenna strength change trend according to claim 1, characterized in that: The degree of dispersion is the coefficient of variation of all amplitudes of each modal component.

3. The dynamic roll angle measurement method based on antenna strength change trend according to claim 1, characterized in that: The calculation of the disorder coefficient of each modal component includes: Calculate the sum of the differences in the discreteness between all two arbitrary modal components corresponding to each array element at the current moment, and record it as the relative difference; The discrete degree and the relative difference are forwardly fused to obtain the disorder coefficient of each modal component.

4. The dynamic roll angle measurement method based on antenna strength change trend according to claim 3, characterized in that: The further determination process of the forward fusion is: calculating the product of the discrete degree and the relative difference.

5. The dynamic roll angle measurement method based on antenna strength change trend according to claim 1, characterized in that: The further measurement process of the correlation degree is: calculating the Pearson correlation coefficient of the received signal between each array element and the other array elements at the current moment.

6. The dynamic roll angle measurement method based on antenna strength variation trend according to claim 5, characterized in that: The further measurement process of the difference degree is: calculating the measurement distance of the disorder coefficients of all modal components between each array element and the other array elements at the current moment.

7. The dynamic roll angle measurement method based on antenna strength variation trend according to claim 6, characterized in that: The determining of the interference coefficient of each array element at the current moment includes: calculating a ratio between the metric distance and the absolute value of the Pearson correlation coefficient; The fusion result of the ratio between each array element and all other array elements at the current moment is used as the interference coefficient of each array element at the current moment.

8. The dynamic roll angle measurement method based on antenna strength variation trend according to claim 7, characterized in that: A further measurement method of the fusion result is: calculating the cumulative sum of the ratios between each array element and all other array elements at the current moment.

9. The dynamic roll angle measurement method based on antenna strength variation trend according to claim 1, characterized in that: The step size parameter of the least mean square algorithm at the current moment is determined, including: Normalizing the interference coefficients of all array elements at the current moment, and calculating an average value of all normalized results; The step size parameter of the least mean square algorithm at the current moment The calculation formula is: ,in, To preset the minimum step size parameter, is the difference between the preset maximum step size parameter and the preset minimum step size parameter, is the average value.

10. The dynamic roll angle measurement method based on antenna strength variation trend according to claim 1, characterized in that: The measuring of the rolling angle of the projectile includes: when the signal strength received by the antenna is at a minimum value point, establishing a polar coordinate system with the center of the radar beam as the origin to obtain the position coordinates of the center of the projectile; calculating the antenna angle according to the position coordinates and the radius of the projectile; and obtaining the rolling angle of the projectile based on the antenna angle corresponding to the signal strength received by the antenna when the signal strength is at a minimum value point.

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