A method, device and computer device for calculating the amplitude of a seeker sensing signal

Abstract

The present invention relates to the field of seeker induced signal amplitude calculation, and specifically to a method, device and computer device for calculating seeker induced signal amplitude, which improves the efficiency of calculation and can accurately evaluate the performance and signal amplitude of the seeker. The scheme includes calculating the seeker aperture field caused by the target echo; calculating the seeker aperture field caused by the interference pod radiation field; vector superposition of the seeker aperture field caused by the target echo and the seeker aperture field caused by the interference pod radiation field to obtain the aperture field distribution on each subdivided unit on the seeker aperture surface; after obtaining the aperture field distribution on each subdivided unit on the seeker aperture surface, the reaction integral principle is used to calculate the seeker port induced voltage amplitude value under a certain aperture field distribution. The present invention is suitable for calculating the seeker induced signal amplitude.

Description

Technical Field

[0001] The present invention relates to the field of seeker induction signal amplitude calculation, and in particular to a method, device and computer device for calculating the seeker induction signal amplitude. Background Art

[0002] The seeker is an important component of a missile, used to detect and track targets and guide the missile to hit the target. In a complex electromagnetic environment, the seeker is affected by the spatial radiation or scattering field from the target. It is very important to establish a theoretical connection between the radiation or scattering field and the echo signal received by the seeker through electromagnetic field analysis.

[0003] At present, there are various methods to calculate the amplitude of the seeker sensing signal. For example, a common method is to use numerical simulation to calculate the amplitude of the seeker sensing signal. However, this method requires a lot of computing resources and time, has low computing efficiency, and the accuracy of the result is limited by the computing model. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method, device and computer device for calculating the amplitude of the induction signal of the seeker, which improves the efficiency of calculation and can accurately evaluate the performance and signal amplitude of the seeker.

[0005] The present invention adopts the following technical solutions to achieve the above-mentioned purpose. In a first aspect, the present invention provides a method for calculating the amplitude of a seeker sensing signal, the method comprising:

[0006] Step 1, calculate the seeker mouth field caused by the target echo;

[0007] Step 2, calculate the seeker aperture field caused by the interference pod radiation field;

[0008] Step 3, vector superposition is performed on the seeker aperture field caused by the target echo and the seeker aperture field caused by the interference pod radiation field to obtain the aperture field distribution on each subdivision unit on the seeker aperture surface;

[0009] Step 4: After obtaining the aperture field distribution on each subdivided unit on the seeker mouth surface, the reaction integral principle is used to calculate the amplitude value of the induced voltage at the seeker port under a certain aperture field distribution.

[0010] Furthermore, step 1 specifically includes:

[0011] For the target echo of the narrow-band transmission signal, the radar echo signal is a uniform plane wave of the center frequency, calculated by the following formula: in, and is the spatial propagation direction of the radar transmission wave signal, and x, y, and z are three direction vectors; is the vertical polarization component of the radar echo field signal, is the horizontal polarization component of the radar echo field signal, is the unit vector in the vertical polarization direction, is the unit vector in the horizontal polarization direction, E echo (x,y,z) is a uniform plane wave.

[0012] Furthermore, step 2 specifically includes:

[0013] Taking the target antenna as the viewing angle, the far field of the antenna radiation on the spherical surface centered on the antenna is distributed in a spatial solid angle. For a certain spatial solid angle, the electromagnetic signal reaching the seeker is a uniform plane wave, which is calculated by the following formula:

[0014]

[0015]

[0016]

[0017] Where k is the free space wave resistance number, C0 is the speed of light, f is the frequency, R is the distance between the projectile and the target, θ and is the viewing angle of the target antenna, which is the spatial solid angle coordinate of the missile.

[0018] Furthermore, step 3 specifically includes:

[0019] The UVW coordinate system is established with the center of the seeker aperture and the tangent plane of the aperture, and all scattered fields and radiation fields are converted into complex vector components in this coordinate system, and superimposed to obtain the aperture field distribution on each subdivision unit of the seeker aperture.

[0020] For E echo (x,y,z) and Perform vector decomposition and obtain

[0021]

[0022]

[0023]

[0024]

[0025] according to but:

[0026]

[0027]

[0028] Define the radar transmitting electromagnetic wave as D, the echo signal as T, D is decomposed into vertical polarization direction, horizontal polarization direction and transmitting direction T decomposes into and reflection side but:

[0029]

[0030]

[0031]

[0032]

[0033]

[0034]

[0035]

[0036] Where η is the free space wave impedance.

[0037] Furthermore, step 4 specifically includes:

[0038] After obtaining the aperture field distribution on each subdivided unit on the seeker mouth surface, the magnitude of the induced voltage at the seeker port under a certain aperture field distribution is calculated using the reaction integral principle.

[0039] The calculation method includes: if the aperture field distribution of the seeker port under the excitation of the single-frequency signal s(t) = A0 sin(2πft) is The magnetic field distribution is: The induction field distribution of the seeker surface affected by the divergent field in the environment obtained in step 3 is:

[0040] Then the induced signal s′(t) of the seeker port is C0 sin(2πft), and the coefficient C0 is expressed by the integral formula of the reciprocity theorem as follows:

[0041]

[0042] Among them, S′ is the antenna aperture of the seeker, E t and H t is the electric and magnetic field distribution on the seeker port under the excitation of the single-frequency signal s(t), E r and H rThe induced electric and magnetic fields are the distribution of the seeker head's induced electric and magnetic fields due to the radiation scattering field in the environment. The obtained C0 is the required induced voltage amplitude value of the radiation scattering field at the seeker head port.

[0043] In a second aspect, the present invention provides a device for calculating the amplitude of a seeker sensing signal, which is used to implement the method for calculating the amplitude of a seeker sensing signal as described above, and the device comprises:

[0044] The target echo module is used to calculate the seeker muzzle field caused by the target echo;

[0045] The interference pod radiation field module is used to calculate the seeker aperture field caused by the interference pod radiation field;

[0046] The vector superposition calculation module is used to perform vector superposition on the seeker aperture field caused by the target echo and the seeker aperture field caused by the interference pod radiation field, and obtain the aperture field distribution on each subdivision unit on the seeker aperture surface;

[0047] The voltage amplitude value calculation module obtains the aperture field distribution on each subdivided unit on the seeker mouth surface, and then uses the reaction integral principle to calculate the induced voltage amplitude value of the seeker port under a certain aperture field distribution.

[0048] In a third aspect, the present invention provides a computer device, including a memory, wherein the memory stores program instructions, and when the program instructions are executed, the method for calculating the amplitude of the seeker sensing signal as described above is executed.

[0049] The beneficial effects of the present invention are:

[0050] The present invention can obtain a more accurate calculation result of the seeker mouth-to-port induced voltage by vector superposition of the seeker mouth field caused by the target echo and the seeker mouth field caused by the interference pod radiation field, and can accurately evaluate the performance and signal amplitude of the seeker.

[0051] The invention has simple calculation, high accuracy and wide adaptability, and can be applied to the design and optimization of weapon systems such as missiles and aircraft, and can improve the target detection and tracking capabilities of the seeker, ensuring that weapon systems such as missiles accurately strike targets. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 is a flow chart of a method for calculating the amplitude of a seeker sensing signal provided by an embodiment of the present invention;

[0053] Figure 2 It is a schematic diagram of superposition calculation of divergent induction field provided by an embodiment of the present invention;

[0054] Figure 3It is a schematic diagram of the relationship between the seeker mouth surface mesh and the UVW coordinate system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0055] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0056] like Figure 1 As shown, the present invention provides a method for calculating the amplitude of a seeker sensing signal, which specifically includes:

[0057] S1. Calculation of the seeker mouth field caused by the target echo.

[0058] First, for the target echo considering the narrow-band transmission signal, the radar echo signal is a uniform plane wave of the center frequency, which is calculated by the following formula:

[0059]

[0060] in, and is the spatial propagation direction of the radar transmission wave signal, and x, y, and z are three direction vectors; is the vertical polarization component of the radar echo field signal, is the horizontal polarization component of the radar echo field signal, is the unit vector in the vertical polarization direction, is the unit vector in the horizontal polarization direction, E echo (x,y,z) is a uniform plane wave.

[0061] S2. Calculation of the seeker nose field caused by the interference pod radiation field.

[0062] Taking the target antenna as the viewing angle, the far field of the antenna radiation on the spherical surface centered on the antenna is distributed in a spatial solid angle. For a certain spatial solid angle, the electromagnetic signal reaching the seeker is a uniform plane wave, which is calculated by the following formula:

[0063]

[0064] Where k is the free space wave impedance, R is the distance between the projectile and the target, and θ and is the viewing angle of the target antenna, which is the spatial solid angle coordinate of the missile.

[0065] S3. Perform vector superposition of the seeker mouth field caused by the target echo and the seeker mouth field caused by the interference pod radiation field.

[0066] The UVW coordinate system is established with the center of the seeker aperture and the tangent plane of the aperture, and all scattered fields and radiation fields are converted into complex vector components in this coordinate system, and superimposed to obtain the aperture field distribution on each subdivision unit on the seeker aperture, as shown in Figure 2 shown.

[0067] like Figure 3 , there is a pair of E echo (x,y,z) and Perform vector decomposition and obtain The following formula expresses it:

[0068]

[0069]

[0070]

[0071]

[0072] Then we have:

[0073]

[0074]

[0075] Similarly, the radar transmits electromagnetic waves as D and the echo signal as T. D can be decomposed into the vertical polarization direction, the horizontal polarization direction and the transmission direction. T can be decomposed into and reflection side

[0076]

[0077]

[0078]

[0079]

[0080]

[0081]

[0082]

[0083] Where η is the free space wave impedance.

[0084] S4. Calculation of the induced voltage from the seeker surface field to the port.

[0085] After obtaining the aperture field distribution on each subdivided unit on the seeker surface, the magnitude of the induced voltage at the seeker port under a certain aperture field distribution can be obtained by using the reaction integration principle.

[0086] It is known that the aperture field distribution of the seeker port under the excitation of the single-frequency signal s(t) = A0 sin(2πft) is: The magnetic field distribution is:

[0087] The distribution of the induction field on the seeker face due to the divergent field in the environment obtained by S3 is:

[0088] Then, we assume that the induced signal s′(t) of the seeker port is C0 sin(2πft). The coefficient C0 is expressed by the integral formula of the reciprocity theorem as follows:

[0089]

[0090] Among them, S′ is the antenna aperture of the seeker, E t and H t is the electric field and magnetic field distribution on the seeker port under the excitation of the single-frequency signal s(t), and E r and H r The induced electric and magnetic fields are the distribution of the seeker head's induced electric and magnetic fields due to the radiation scattering field in the environment. The obtained C0 is the required induced voltage amplitude value of the radiation scattering field at the seeker head port.

[0091] The present invention also provides a device for calculating the amplitude of a seeker sensing signal, which is used to implement the method for calculating the amplitude of a seeker sensing signal as described in the present invention. The device comprises:

[0092] The target echo module is used to calculate the seeker muzzle field caused by the target echo;

[0093] The interference pod radiation field module is used to calculate the seeker aperture field caused by the interference pod radiation field;

[0094] The vector superposition calculation module is used to perform vector superposition on the seeker aperture field caused by the target echo and the seeker aperture field caused by the interference pod radiation field, and obtain the aperture field distribution on each subdivision unit on the seeker aperture surface;

[0095] The voltage amplitude value calculation module obtains the aperture field distribution on each subdivided unit on the seeker mouth surface, and then uses the reaction integral principle to calculate the induced voltage amplitude value of the seeker port under a certain aperture field distribution.

[0096] In one embodiment of the present invention, the target echo module is specifically used for, for the target echo of the narrow-band transmission signal, the radar echo signal is a uniform plane wave of the center frequency, calculated by the following formula: in, and is the spatial propagation direction of the radar transmission wave signal, and x, y, and z are three direction vectors; is the vertical polarization component of the radar echo field signal, is the horizontal polarization component of the radar echo field signal, is the unit vector in the vertical polarization direction, is the unit vector in the horizontal polarization direction, E echo (x,y,z) is a uniform plane wave.

[0097] In one embodiment of the present invention, the interference pod radiation field module is specifically used to take the target antenna as the viewing angle, and the antenna radiation far field on the spherical surface centered on the antenna is distributed in a spatial solid angle. For a certain spatial solid angle, the electromagnetic signal reaching the seeker is a uniform plane wave, which is calculated by the following formula:

[0098]

[0099]

[0100]

[0101] Where k is the free space wave resistance number, C0 is the speed of light, f is the frequency, R is the distance between the projectile and the target, θ and is the viewing angle of the target antenna, the spatial solid angle coordinate of the missile.

[0102] In one embodiment of the present invention, the vector superposition calculation module is specifically used to establish a UVW coordinate system with the center of the seeker aperture and the tangent plane of the aperture, convert all scattered fields and radiation fields into complex vector components in this coordinate system, and superimpose them to obtain the aperture field distribution on each subdivision unit on the seeker aperture.

[0103] In one embodiment of the present invention, the voltage amplitude value calculation module is specifically used to calculate the magnitude of the induced voltage at the seeker port under a certain aperture field distribution by using the reaction integral principle after obtaining the aperture field distribution on each subdivided unit on the seeker mouth surface;

[0104] The calculation method includes: if the aperture field distribution of the seeker port under the excitation of the single-frequency signal s(t) = A0 sin(2πft) is The magnetic field distribution is: The induction field distribution of the seeker surface affected by the divergent field in the environment obtained in step 3 is:

[0105] Then the induced signal s′(t) of the seeker port is C0 sin(2πft), and the coefficient C0 is expressed by the integral formula of the reciprocity theorem as follows:

[0106]

[0107] Among them, S′ is the antenna aperture of the seeker, E t and H t is the electric and magnetic field distribution on the seeker port under the excitation of the single-frequency signal s(t), E r and H r The induced electric and magnetic fields are the distribution of the seeker head's induced electric and magnetic fields due to the radiation scattering field in the environment. The obtained C0 is the required induced voltage amplitude value of the radiation scattering field at the seeker head port.

[0108] The present invention also provides a computer device, including a memory, wherein the memory stores program instructions, and when the program instructions are executed, the method for calculating the amplitude of the seeker sensing signal as described above is executed.

[0109] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A method for calculating the amplitude of a seeker sensing signal, characterized in that: The method comprises: Step 1, calculate the seeker mouth field caused by the target echo; Step 2, calculate the seeker aperture field caused by the interference pod radiation field; Step 3, vector superposition is performed on the seeker aperture field caused by the target echo and the seeker aperture field caused by the interference pod radiation field to obtain the aperture field distribution on each subdivision unit on the seeker aperture surface; Step 4: After obtaining the aperture field distribution on each subdivided unit on the seeker mouth surface, the reaction integral principle is used to calculate the amplitude value of the induced voltage at the seeker port under a certain aperture field distribution.

2. The method for calculating the amplitude of the seeker sensing signal according to claim 1, characterized in that: Step 1 specifically includes: For the target echo of the narrow-band transmission signal, the radar echo signal is a uniform plane wave of the center frequency, calculated by the following formula: in, and is the spatial propagation direction of the radar transmission wave signal, and x, y, and z are three direction vectors; is the vertical polarization component of the radar echo field signal, is the horizontal polarization component of the radar echo field signal, is the unit vector in the vertical polarization direction, is the unit vector in the horizontal polarization direction, E echo (x,y,z) is a uniform plane wave.

3. The method for calculating the amplitude of the seeker sensing signal according to claim 2, characterized in that: Step 2 specifically includes: Taking the target antenna as the viewing angle, the far field of the antenna radiation on the spherical surface centered on the antenna is distributed in a spatial solid angle. For a certain spatial solid angle, the electromagnetic signal reaching the seeker is a uniform plane wave, which is calculated by the following formula: Where k is the free space wave resistance number, C0 is the speed of light, f is the frequency, R is the distance between the projectile and the target, θ and is the viewing angle of the target antenna, which is the spatial solid angle coordinate of the missile.

4. The method for calculating the amplitude of the seeker sensing signal according to claim 3, characterized in that: Step 3 specifically includes: The UVW coordinate system is established with the center of the seeker aperture and the tangent plane of the aperture, and all scattered fields and radiation fields are converted into complex vector components in this coordinate system, and superimposed to obtain the aperture field distribution on each subdivision unit of the seeker aperture. For E echo (x,y,z) and Perform vector decomposition and obtain according to but: Define the radar transmitting electromagnetic wave as D, the echo signal as T, D is decomposed into vertical polarization direction, horizontal polarization direction and transmitting direction T decomposes into and reflection side but: Where η is the free space wave impedance.

5. The method for calculating the amplitude of the seeker sensing signal according to claim 1, characterized in that: Step 4 specifically includes: After obtaining the aperture field distribution on each subdivided unit on the seeker mouth surface, the magnitude of the induced voltage at the seeker port under a certain aperture field distribution is calculated using the reaction integral principle. The calculation method includes: if the aperture field distribution of the seeker port under the excitation of the single-frequency signal s(t) = A0 sin(2πft) is The magnetic field distribution is: The induction field distribution of the seeker mouth surface obtained according to step 3 is: Then the sensing signal s at the seeker port is ′ (t) = C0 sin(2πft), the coefficient C0 is expressed by the integral formula of the reciprocity theorem as follows: Among them, S′ is the antenna aperture of the seeker, E t and H t is the electric field and magnetic field distribution on the seeker port under the excitation of the single-frequency signal s(t), E r and H r The induced electric and magnetic fields are the distribution of the seeker head's induced electric and magnetic fields due to the radiation scattering field in the environment. The obtained C0 is the required induced voltage amplitude value of the radiation scattering field at the seeker head port.

6. A device for calculating the amplitude of a seeker sensing signal, used to implement the method for calculating the amplitude of a seeker sensing signal as claimed in any one of claims 1 to 5, characterized in that: The device comprises: The target echo module is used to calculate the seeker muzzle field caused by the target echo; The interference pod radiation field module is used to calculate the seeker aperture field caused by the interference pod radiation field; The vector superposition calculation module is used to perform vector superposition on the seeker aperture field caused by the target echo and the seeker aperture field caused by the interference pod radiation field, and obtain the aperture field distribution on each subdivision unit on the seeker aperture surface; The voltage amplitude value calculation module obtains the aperture field distribution on each subdivided unit on the seeker mouth surface, and then uses the reaction integral principle to calculate the induced voltage amplitude value of the seeker port under a certain aperture field distribution.

7. A computer device comprising a memory, wherein the memory stores program instructions, characterized in that: When the program instructions are executed, the method for calculating the amplitude of the seeker sensing signal as described in any one of claims 1 to 5 is executed.

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