A target angle measurement method, device, apparatus and medium

Abstract

This application belongs to the field of direction finding technology, and relates to a method, apparatus, device, and medium for measuring target angles. The method includes: acquiring the echo signals of a dynamic target in a horizontally polarized channel and a vertically polarized channel using a single-pulse direction finding system; obtaining the sum signal of the horizontally polarized channel, the difference signal of the horizontally polarized channel, the sum signal of the vertically polarized channel, the difference signal of the vertically polarized channel, and the polarization ratio; for the target search angle, linearly combining the original receiving channels based on the sum and difference signals to generate a virtual signal; obtaining the polarization ratio sequence of the virtual signal based on the virtual signal and the polarization ratio; performing variance calculation based on the polarization ratio sequence of the virtual signal to obtain the polarization fluctuation factor; and performing a one-dimensional search based on the polarization fluctuation factor to obtain the optimal estimate of the target angle, which is used as the measurement result of the target angle. This application can achieve high-precision target angle measurement.

Description

Technical Field

[0001] This application relates to the field of orientation measurement technology, and in particular to a method, apparatus, device, and medium for measuring the angle of a target. Background Technology

[0002] Direction finding technology is widely used in fields such as communication monitoring, electronic countermeasures, aviation navigation, emergency rescue, spectrum management and IoT positioning. Its core task is to use the received signal source radiation information to determine the spatial orientation angle of the signal source (such as azimuth angle and elevation angle), thereby achieving target positioning and tracking.

[0003] In existing technologies, in fields requiring precise direction-of-arrival (DOA) determination, such as remote sensing, radio astronomy, and wireless positioning, the performance of traditional direction-finding methods (e.g., single-pulse amplitude / phase comparison, beamforming, etc.) deteriorates significantly when two or more radiation sources are located close to each other and have highly coherent signals. This phenomenon stems from the interference of multiple coherent source signals at the receiver, causing distortion of the directional characteristics of the synthesized signal and producing an effect similar to angular scintillation, making it impossible for the direction-finding system to accurately distinguish the direction of the real target source. Specifically: (1) Insufficient spatial degrees of freedom: When the angular interval between multiple radiation sources is less than the inherent resolution of the system, the spatial filtering method fails due to insufficient degrees of freedom.

[0004] (2) Limitations of polarization filtering: Assuming that different radiation sources have fixed and known polarization states, they can be suppressed by polarization filtering; however, in dynamic scenarios, the attitude change of the target under test will cause the polarization state of the echo signal to fluctuate rapidly, while the polarization state of the ground fixed auxiliary source or some reference source usually remains relatively stable. Summary of the Invention

[0005] Therefore, it is necessary to provide a method, apparatus, device, and medium for measuring target angles, which can achieve high-precision target angle measurement, in order to address the above-mentioned technical problems.

[0006] A method for measuring a target angle, comprising: The echo signals of the dynamic target in the horizontal and vertical polarization channels of the single-pulse direction finding system are acquired, and the sum signal, difference signal, sum signal, difference signal and polarization ratio of the horizontal polarization channel are obtained. For the target search angle, the original receiving channels are linearly combined based on the sum signal of the horizontal polarization channel, the difference signal of the horizontal polarization channel, the sum signal of the vertical polarization channel, and the difference signal of the vertical polarization channel to generate a virtual signal. Based on the virtual signal and the polarization ratio, the polarization ratio sequence of the virtual signal is obtained; The polarization fluctuation factor is obtained by performing variance calculation based on the polarization ratio sequence of the virtual signal. Based on the polarization fluctuation factor, a one-dimensional search is performed to obtain the optimal estimate of the target angle, which is then used as the measurement result of the target angle.

[0007] In one embodiment, acquiring the echo signals of a dynamic target in the horizontal and vertical polarization channels of a single-pulse direction-finding system, and obtaining the sum signal of the horizontal polarization channel, the difference signal of the horizontal polarization channel, the sum signal of the vertical polarization channel, the difference signal of the vertical polarization channel, and the polarization ratio, includes: The echo signal of the dynamic target in the horizontal polarization channel of the single-pulse direction finding system is obtained, and the sum signal and the difference signal of the horizontal polarization channel are obtained. The echo signal of the dynamic target in the vertical polarization channel of the single-pulse direction finding system is obtained, and the sum signal and the difference signal of the vertical polarization channel are obtained. The polarization ratio is obtained by acquiring the echo signals of the dynamic target in the horizontal and vertical polarization channels of the single-pulse direction finding system.

[0008] In one embodiment, acquiring the echo signal of a dynamic target in the horizontal polarization channel of a single-pulse direction finding system, and obtaining the sum signal and difference signal of the horizontal polarization channel, includes: ; ; In the formula, For the sum of signals in the horizontally polarized channel, The difference signal for the horizontally polarized channel. The amplitude of the dual-polarized signal from the first background coherent source in the horizontal polarization channel. The amplitude of the dual-polarization signal of the second background coherent source in the horizontal polarization channel. This represents the echo signal of a dynamic target within the horizontal polarization channel. The sum of the horizontally polarized channels and the signal are Gaussian white noise. The difference signal in the horizontally polarized channel is Gaussian white noise. For the first background coherent source single pulse ratio, The single-pulse ratio of the second background coherent source, The target single-pulse ratio; To acquire the echo signal of a dynamic target within the vertical polarization channel of a single-pulse direction finding system, the sum signal and difference signal of the vertical polarization channel are obtained, including: ; ; In the formula, For the sum of signals in the vertically polarized channels, This is the difference signal for the vertically polarized channel. The amplitude of the dual-polarized signal from the first background coherent source in the vertical polarization channel. The amplitude of the dual-polarization signal from the second background coherent source in the vertical polarization channel. This refers to the echo signal of a dynamic target within the vertical polarization channel. The sum of the signals in the vertically polarized channels is Gaussian white noise. The difference signal is Gaussian white noise for the vertical polarization channel.

[0009] In one embodiment, for the target search angle, a virtual signal is generated by linearly combining the original receiving channels based on the sum signal of the horizontal polarization channel, the difference signal of the horizontal polarization channel, the sum signal of the vertical polarization channel, and the difference signal of the vertical polarization channel, including: ; ; in, ; In the formula, This represents the component of the virtual signal in the horizontal polarization channel. This represents the component of the virtual signal in the vertical polarization channel. The difference signal for the horizontally polarized channel. This is the difference signal for the vertically polarized channel. For the sum of signals in the horizontally polarized channel, For the sum of signals in the vertically polarized channels, , For the number of snapshots, For the target single pulse ratio, The slope of the lateral angle. From the perspective of the target search, This represents the antenna beamwidth.

[0010] In one embodiment, obtaining the polarization ratio sequence of the virtual signal based on the virtual signal and the polarization ratio includes: ; In the formula, This is the polarization ratio sequence of the virtual signal.

[0011] In one embodiment, variance calculation is performed based on the polarization ratio sequence of the virtual signal to obtain the polarization fluctuation factor, including: ; In the formula, Polarization fluctuation factor For variance calculation, for The real part, for The imaginary part, This is the polarization ratio sequence of the virtual signal.

[0012] In one embodiment, a one-dimensional search is performed based on the polarization fluctuation factor to obtain the optimal estimate of the target angle, which is then used as the measurement result of the target angle, including: ; In the formula, This is the optimal estimate of the target angle. From the perspective of the target search, Polarization fluctuation factor This represents the antenna beamwidth.

[0013] A target angle measuring device, comprising: The first module is used to acquire the echo signals of the dynamic target in the horizontal polarization channel and the vertical polarization channel of the single-pulse direction finding system, and to obtain the sum signal of the horizontal polarization channel, the difference signal of the horizontal polarization channel, the sum signal of the vertical polarization channel, the difference signal of the vertical polarization channel, and the polarization ratio. The second module is used to linearly combine the original receiving channels based on the sum signal of the horizontal polarization channel, the difference signal of the horizontal polarization channel, the sum signal of the vertical polarization channel, and the difference signal of the vertical polarization channel to generate a virtual signal for the target search angle. The third module is used to obtain the polarization ratio sequence of the virtual signal based on the virtual signal and the polarization ratio. The fourth module is used to perform variance calculation based on the polarization ratio sequence of the virtual signal to obtain the polarization fluctuation factor; The fifth module is used to perform a one-dimensional search based on the polarization fluctuation factor to obtain the optimal estimate of the target angle, which is then used as the measurement result of the target angle.

[0014] A computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the steps of the above method.

[0015] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above method.

[0016] The aforementioned target angle measurement method is a high-precision direction finding method that utilizes the difference in polarization statistical characteristics between the target signal and the background coherent signal (i.e., fully leveraging the fundamental difference in the time-varying polarization characteristics between the target source and the auxiliary source). By constructing a parameterized weighted receiving channel and using the minimization of the polarization variance of the output signal of this channel as the optimization criterion, the optimal parameters are searched and directly correspond to the angle of the real target. The method utilizes the dynamic statistical characteristics of the signal polarization domain (i.e., the polarization state of the echo signal of a dynamic target fluctuates drastically over time (snapshot), while the polarization state of a fixed or cooperating background coherent source changes relatively smoothly over time). Even in the presence of a strong coherent background radiation source, it can still achieve high-precision and highly robust single-pulse measurement of the target angle. Attached Figure Description

[0017] Figure 1 This is a flowchart illustrating a method for measuring a target angle in one embodiment; Figure 2 This is a diagram showing the polarization distribution of an aircraft target and its echo in a specific embodiment. Figure 3 A graph showing the variation of the polarization fluctuation factor in a specific embodiment; Figure 4 A comparison diagram of the azimuth angles of this application and the prior art in Monte Carlo simulation of a specific embodiment; Figure 5 A comparison chart of the root mean square error of Monte Carlo simulation of this application and the prior art in a specific embodiment; Figure 6 This is a comparison chart of angle measurement errors under different snapshot values ​​in a specific embodiment; Figure 7 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0019] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this application, "multiple sets" means at least two sets, such as two sets, three sets, etc., unless otherwise explicitly specified.

[0020] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0021] Furthermore, the technical solutions of the various embodiments of this application can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this application.

[0022] This application provides a method for measuring a target angle, such as... Figure 1 The flowchart shown, in one embodiment, includes: Step 101: Obtain the echo signals of the dynamic target in the horizontal polarization channel and the vertical polarization channel of the single-pulse direction finding system, and obtain the sum signal of the horizontal polarization channel, the difference signal of the horizontal polarization channel, the sum signal of the vertical polarization channel, the difference signal of the vertical polarization channel, and the polarization ratio.

[0023] Specifically: Consider a single-pulse direction finding system with dual orthogonal polarization channel receiving capability; The echo signal of the dynamic target in the horizontal polarization channel of the single-pulse direction finding system is obtained, and the sum signal and the difference signal of the horizontal polarization channel are obtained. The echo signal of the dynamic target in the vertical polarization channel of the single-pulse direction finding system is obtained, and the sum signal and the difference signal of the vertical polarization channel are obtained. The polarization ratio is obtained by acquiring the echo signals of the dynamic target in the horizontal and vertical polarization channels of the single-pulse direction finding system.

[0024] More specifically: Consider a single-pulse direction finding system with dual orthogonal polarization channel receiving capability; To obtain the echo signal of a dynamic target in the horizontal (H) polarization channel of a single-pulse direction finding system, the sum signal and difference signal of the horizontal polarization channel are obtained: ; ; In the formula, For the sum of signals in the horizontally polarized channel, The difference signal for the horizontally polarized channel. This represents the dual-polarized signal of the first background coherent source in the horizontal polarization channel. This represents the dual-polarized signal of the second background coherent source in the horizontal polarization channel. This represents the echo signal of a dynamic target within the horizontal polarization channel. The sum of the horizontally polarized channels and the signal are Gaussian white noise. The difference signal in the horizontally polarized channel is Gaussian white noise. For the first background coherent source single pulse ratio, The single-pulse ratio of the second background coherent source, The target single-pulse ratio; To obtain the echo signal of a dynamic target in the vertical (V) polarization channel of a single-pulse direction finding system, the sum signal and difference signal of the vertical polarization channel are obtained: ; ; In the formula, For the sum of signals in the vertically polarized channels, This is the difference signal for the vertically polarized channel. The amplitude of the dual-polarized signal from the first background coherent source in the vertical polarization channel. The amplitude of the dual-polarization signal from the second background coherent source in the vertical polarization channel. This refers to the echo signal of a dynamic target within the vertical polarization channel. The sum of the signals in the vertically polarized channels is Gaussian white noise. The difference signal in the vertically polarized channel is Gaussian white noise; The echo signals of a dynamic target in the horizontal and vertical polarization channels of a single-pulse direction finding system are acquired (the Jones vector parameters of the echo signals fluctuate with the target attitude between snapshots, characterizing high polarization variability; the Jones vector parameters of the dual-polarization signals remain basically stable or only slightly perturbated between different snapshots, characterizing low polarization variability), and the polarization ratio is obtained: ; In the formula, Polarization ratio, This refers to the echo signal of a dynamic target within the vertical polarization channel. This represents the echo signal of a dynamic target within the horizontal polarization channel. The polarization angle of the echo signal's Jones vector parameter. The polarization phase angle is the Jones vector parameter of the echo signal. It is a natural constant. It is a complex number.

[0025] In this step, the system performs a snapshot for each snapshot. The received signal is modeled to obtain the sum and difference signals.

[0026] Step 102: For the target search angle, the original receiving channels are linearly combined based on the sum signal of the horizontal polarization channel, the difference signal of the horizontal polarization channel, the sum signal of the vertical polarization channel, and the difference signal of the vertical polarization channel to generate a virtual signal.

[0027] Specifically: ; ; in, ; In the formula, This represents the component of the virtual signal in the horizontal polarization channel. This represents the component of the virtual signal in the vertical polarization channel. The difference signal for the horizontally polarized channel. This is the difference signal for the vertically polarized channel. For the sum of signals in the horizontally polarized channel, For the sum of signals in the vertically polarized channels, , For the number of snapshots, For the target single pulse ratio, The slope of the lateral angle. From the perspective of the target search, This represents the antenna beamwidth.

[0028] In this step, virtual polarization weighting is performed, and the generated virtual signal is a pair of virtual polarization weighted signals.

[0029] Step 103: Based on the virtual signal and the polarization ratio, obtain the polarization ratio sequence of the virtual signal.

[0030] Specifically: ; In the formula, This is the polarization ratio sequence of the virtual signal.

[0031] In this step, the polarization ratio sequence of the virtual signal is a time-varying sequence that can characterize the polarization state of the virtual signal.

[0032] Step 104: Perform variance calculation based on the polarization ratio sequence of the virtual signal to obtain the polarization fluctuation factor.

[0033] Specifically: ; In the formula, Polarization fluctuation factor For variance calculation, for The real part, for The imaginary part, This is the polarization ratio sequence of the virtual signal.

[0034] In this step, the polarization fluctuation factor is generated. The polarization fluctuation factor serves as a core indicator for evaluating signal polarization stability. The smaller the value, the better the target search angle. The more stable the polarization state of the synthesized virtual signal, the closer it is to the spatial angle of the target.

[0035] Step 105: Based on the polarization fluctuation factor, perform a one-dimensional search to obtain the optimal estimate of the target angle, which is then used as the measurement result of the target angle.

[0036] Specifically: ; In the formula, This is the optimal estimate of the target angle. The target search angle (i.e., the hypothetical target wave direction). Polarization fluctuation factor This represents the antenna beamwidth.

[0037] In this step, based on the polarization fluctuation factor, an angle estimation is performed to minimize it; that is, within a given main lobe half-width interval, the angle that minimizes the cost function is found. The target search angle that achieves the minimum value As the optimal estimate of the target angle When the target search angle Equal to the true target angle At this time, virtual weighting can suppress target signals with high polarization fluctuation characteristics to the greatest extent. At this time, the virtual signal mainly contains background coherent source signals and noise with low polarization fluctuation, which leads to the polarization fluctuation factor of the entire signal sequence. Reach the global minimum.

[0038] The aforementioned target angle measurement method is a high-precision direction finding method that utilizes the difference in polarization statistical characteristics between the target signal and the background coherent signal (i.e., fully leveraging the fundamental difference in the time-varying polarization characteristics between the target source and the auxiliary source). By constructing a parameterized weighted receiving channel and using the minimization of the polarization variance of the output signal of this channel as the optimization criterion, the optimal parameters are searched and directly correspond to the angle of the real target. The method utilizes the dynamic statistical characteristics of the signal polarization domain (i.e., the polarization state of the echo signal of a dynamic target fluctuates drastically over time (snapshot), while the polarization state of a fixed or cooperating background coherent source changes relatively smoothly over time). Even in the presence of a strong coherent background radiation source, it can still achieve high-precision and highly robust single-pulse measurement of the target angle.

[0039] Specifically: 1. Based on the polarization fluctuation factor, a one-dimensional search is performed to obtain the optimal estimate of the target angle, realizing high-precision angle measurement (high-precision direction finding): By utilizing the statistical difference of signal polarization, rather than the instantaneous polarization state, the direction finding problem under strong coherent background sources is fundamentally solved, breaking through the limits of traditional direction finding and realizing high-precision angle measurement in scenarios where traditional methods fail.

[0040] 2. Based on the polarization fluctuation factor, a one-dimensional search is performed to obtain the optimal estimate of the target angle, which has excellent environmental robustness: the angle measurement performance shows strong stability against amplitude / phase mismatch, small polarization differences and changes in received signal-to-noise ratio within the background coherent source, and is suitable for complex and variable real electromagnetic environments.

[0041] 3. For the target search angle, the original receiving channels are linearly combined to generate a virtual signal, and combined with the polarization ratio, the polarization ratio sequence of the virtual signal is obtained, which improves the computational efficiency and real-time performance: linear weighting, polarization ratio calculation and one-dimensional search are adopted to avoid complex matrix operations, iterative optimization or multi-dimensional search, which greatly reduces the computational complexity and makes it easy to execute in real time in embedded signal processors.

[0042] 4. Excellent system compatibility and easy integration: The method only requires the receiving system to have a dual-polarization channel, and has no special requirements for the transmitted signal waveform, array configuration and transmitted beam. It can be easily integrated into various existing direction finding systems for performance upgrades.

[0043] It should be understood that, although Figure 1 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order in which these steps are executed, and they can be performed in other orders. Furthermore, Figure 1At least some of the steps in the process may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.

[0044] In one specific embodiment, measured echo data from a small civilian aircraft are used to analyze and verify the method of this application.

[0045] Objective: Fully polarimetric scattering data of the aircraft (1000 snapshots), such as Figure 2 The polarization distribution of the aircraft target and its echo shown in the diagram exhibits significant random fluctuations in polarization.

[0046] Background: Two coherent sources; amplitude ratio a The polarization values ​​were set to 0.5 dB and 1.5 dB respectively (both with a Gaussian perturbation of 0.5 dB standard deviation); the phase difference was set to 180° (with a Gaussian perturbation of 5° standard deviation); the polarization states were set to small-range random perturbations near left-handed circular polarization, where the Jones vector of source 1 satisfies the distribution. ~ N (45°, (1°)2), ~ N (90°, (5°)2), the Jones vector distribution of source 2 satisfies ~ N (42°, (1°)2) and ~N(86°, (5°)2).

[0047] like Figure 3 The curve of the polarization fluctuation factor shown in the figure has a sharp and significant global minimum valley at the target true angle (-1 degree), which intuitively proves the effectiveness and feasibility of the "minimization of polarization fluctuation" criterion.

[0048] like Figure 4 The diagram showing the comparison of azimuth angles between the present application and the prior art in Monte Carlo simulations demonstrates that, under high source intensity ratio (30 dB) conditions, the prior art single-pulse angle measurement method completely fails due to the significant influence of the coherent source, with the estimated value deviating severely from the true value; while the method of the present application can accurately converge to around -1° with minimal estimation deviation and significant performance.

[0049] like Figure 5The diagram shows a comparison of the root mean square error (RMSE) of this application and prior art in Monte Carlo simulations. It can be seen that the RMSE of the proposed method remains below 0.1° even when the background source SNR is greater than 20 dB, and this performance is highly sensitive to changes in the target SNR and the background source amplitude ratio. a and phase perturbation It is insensitive to factors such as these, demonstrating extremely strong environmental robustness.

[0050] like Figure 6 The comparison chart of angle measurement errors under different snapshot values ​​shows that RMSE decreases monotonically with the increase of the number of snapshots. It has reached excellent performance when l=15, which meets the assumption that the target angle is quasi-stationary in a short processing time in practical applications, thus balancing the requirements of performance and real-time performance.

[0051] This application also provides a target angle measuring device, which in one embodiment includes: a first module, a second module, a third module, a fourth module, and a fifth module, wherein: The first module is used to acquire the echo signals of the dynamic target in the horizontal polarization channel and the vertical polarization channel of the single-pulse direction finding system, and to obtain the sum signal of the horizontal polarization channel, the difference signal of the horizontal polarization channel, the sum signal of the vertical polarization channel, the difference signal of the vertical polarization channel, and the polarization ratio. The second module is used to linearly combine the original receiving channels based on the sum signal of the horizontal polarization channel, the difference signal of the horizontal polarization channel, the sum signal of the vertical polarization channel, and the difference signal of the vertical polarization channel to generate a virtual signal for the target search angle. The third module is used to obtain the polarization ratio sequence of the virtual signal based on the virtual signal and the polarization ratio. The fourth module is used to perform variance calculation based on the polarization ratio sequence of the virtual signal to obtain the polarization fluctuation factor; The fifth module is used to perform a one-dimensional search based on the polarization fluctuation factor to obtain the optimal estimate of the target angle, which is then used as the measurement result of the target angle.

[0052] Specific limitations regarding the target angle measuring device can be found in the limitations of the target angle measurement method described above, and will not be repeated here. Each module in the aforementioned device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in hardware or independently of the processor in a computer device, or stored in software in the memory of a computer device, so that the processor can call and execute the operations corresponding to each module.

[0053] In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 7 As shown, the computer device includes a processor, memory, network interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface is used to communicate with external terminals via a network connection. When the computer program is executed by the processor, it implements a method for measuring a target angle. The display screen can be an LCD screen or an e-ink screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad mounted on the computer device casing, or an external keyboard, touchpad, or mouse.

[0054] Those skilled in the art will understand that Figure 7 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0055] In one embodiment, a computer device is provided, including a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement the steps of the method described above.

[0056] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described above.

[0057] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, 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. 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), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0058] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0059] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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.

[0060] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended application documents.

Claims

1. A method for measuring a target angle, characterized in that, include: The echo signals of the dynamic target in the horizontal and vertical polarization channels of the single-pulse direction finding system are acquired, and the sum signal, difference signal, sum signal, difference signal and polarization ratio of the horizontal polarization channel are obtained. For the target search angle, the original receiving channels are linearly combined based on the sum signal of the horizontal polarization channel, the difference signal of the horizontal polarization channel, the sum signal of the vertical polarization channel, and the difference signal of the vertical polarization channel to generate a virtual signal. Based on the virtual signal and the polarization ratio, the polarization ratio sequence of the virtual signal is obtained; The polarization fluctuation factor is obtained by performing variance calculation based on the polarization ratio sequence of the virtual signal. Based on the polarization fluctuation factor, a one-dimensional search is performed to obtain the optimal estimate of the target angle, which is then used as the measurement result of the target angle.

2. The method for measuring a target angle according to claim 1, characterized in that, The echo signals of a dynamic target in the horizontal and vertical polarization channels of a single-pulse direction-finding system are acquired, yielding the sum signal of the horizontal polarization channel, the difference signal of the horizontal polarization channel, the sum signal of the vertical polarization channel, the difference signal of the vertical polarization channel, and the polarization ratio, including: The echo signal of the dynamic target in the horizontal polarization channel of the single-pulse direction finding system is obtained, and the sum signal and the difference signal of the horizontal polarization channel are obtained. The echo signal of the dynamic target in the vertical polarization channel of the single-pulse direction finding system is obtained, and the sum signal and the difference signal of the vertical polarization channel are obtained. The polarization ratio is obtained by acquiring the echo signals of the dynamic target in the horizontal and vertical polarization channels of the single-pulse direction finding system.

3. The method for measuring a target angle according to claim 2, characterized in that, To acquire the echo signal of a dynamic target in the horizontal polarization channel of a single-pulse direction finding system, the sum signal and difference signal of the horizontal polarization channel are obtained, including: In the formula, For the sum of signals in the horizontally polarized channel, The difference signal for the horizontally polarized channel. The amplitude of the dual-polarized signal from the first background coherent source in the horizontal polarization channel. The amplitude of the dual-polarization signal of the second background coherent source in the horizontal polarization channel. This represents the echo signal of a dynamic target within the horizontal polarization channel. The sum of the horizontally polarized channels and the signal are Gaussian white noise. The difference signal in the horizontally polarized channel is Gaussian white noise. For the first background coherent source single pulse ratio, The single-pulse ratio of the second background coherent source, The target single-pulse ratio; To acquire the echo signal of a dynamic target within the vertical polarization channel of a single-pulse direction finding system, the sum signal and difference signal of the vertical polarization channel are obtained, including: In the formula, For the sum of signals in the vertically polarized channels, This is the difference signal for the vertically polarized channel. The amplitude of the dual-polarized signal from the first background coherent source in the vertical polarization channel. The amplitude of the dual-polarization signal from the second background coherent source in the vertical polarization channel. This refers to the echo signal of a dynamic target within the vertical polarization channel. The sum of the signals in the vertically polarized channels is Gaussian white noise. The difference signal is Gaussian white noise for the vertical polarization channel.

4. The method for measuring a target angle according to claim 3, characterized in that, For the target search angle, based on the sum signal of the horizontal polarization channel, the difference signal of the horizontal polarization channel, the sum signal of the vertical polarization channel, and the difference signal of the vertical polarization channel, the original receiving channels are linearly combined to generate a virtual signal, including: in, In the formula, This represents the component of the virtual signal in the horizontal polarization channel. This represents the component of the virtual signal in the vertical polarization channel. The difference signal for the horizontally polarized channel. This is the difference signal for the vertically polarized channel. For the sum of signals in the horizontally polarized channel, For the sum of signals in the vertically polarized channels, , For the number of snapshots, For the target single pulse ratio, The slope of the lateral angle. From the perspective of the target search, This represents the antenna beamwidth.

5. The method for measuring a target angle according to claim 4, characterized in that, Based on the virtual signal and the polarization ratio, the polarization ratio sequence of the virtual signal is obtained, including: In the formula, This is the polarization ratio sequence of the virtual signal.

6. A method for measuring a target angle according to any one of claims 1 to 5, characterized in that, Based on the polarization ratio sequence of the virtual signal, variance calculation is performed to obtain the polarization fluctuation factor, including: In the formula, Polarization fluctuation factor For variance calculation, for The real part, for The imaginary part, This is the polarization ratio sequence of the virtual signal.

7. A method for measuring a target angle according to any one of claims 1 to 5, characterized in that, Based on the polarization fluctuation factor, a one-dimensional search is performed to obtain the optimal estimate of the target angle, which is used as the measurement result of the target angle, including: In the formula, This is the optimal estimate of the target angle. From the perspective of the target search, Polarization fluctuation factor This represents the antenna beamwidth.

8. A device for measuring a target angle, characterized in that, include: The first module is used to acquire the echo signals of the dynamic target in the horizontal polarization channel and the vertical polarization channel of the single-pulse direction finding system, and to obtain the sum signal of the horizontal polarization channel, the difference signal of the horizontal polarization channel, the sum signal of the vertical polarization channel, the difference signal of the vertical polarization channel, and the polarization ratio. The second module is used to linearly combine the original receiving channels based on the sum signal of the horizontal polarization channel, the difference signal of the horizontal polarization channel, the sum signal of the vertical polarization channel, and the difference signal of the vertical polarization channel to generate a virtual signal for the target search angle. The third module is used to obtain the polarization ratio sequence of the virtual signal based on the virtual signal and the polarization ratio. The fourth module is used to perform variance calculation based on the polarization ratio sequence of the virtual signal to obtain the polarization fluctuation factor; The fifth module is used to perform a one-dimensional search based on the polarization fluctuation factor to obtain the optimal estimate of the target angle, which is then used as the measurement result of the target angle.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 7.

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