A Hardware-in-the-Loop Radio Frequency Simulation Method for Multiple Scattering Centers

Abstract

The present invention provides a hardware-in-the-loop radio frequency simulation method for multiple scattering centers, belonging to the technical field of hardware-in-the-loop radio frequency simulation. The method includes: establishing a mathematical coordinate system for the simulation scene; grouping the multiple scattering centers according to the established mathematical coordinate system of the simulation scene; synthesizing the scattering centers in each group into one scattering center; and calculating the feeding coefficients of the hardware-in-the-loop radio frequency simulation triplets of the synthesized scattering centers in each group. By adopting the present invention, the requirements for the number of triplets and the number of simulation channels can be reduced while ensuring the simulation accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of hardware-in-the-loop radio frequency simulation, and particularly to a hardware-in-the-loop radio frequency simulation method for multiple scattering centers. Background Art

[0002] In the research and development process of modern electronic systems, tests are essential. However, outdoor field tests require a large amount of resources and generally take a long time. During the research and development cycle of an electronic system, multiple tests are often required, and the levels of each test are different. To save costs, some outdoor tests can be replaced by indoor tests. In a microwave anechoic chamber, the electromagnetic environment under outdoor field conditions can be simulated, and the developed electronic system can be placed in this environment to observe the response of the electronic system in this environment. This is called hardware-in-the-loop radio frequency simulation.

[0003] The development of hardware-in-the-loop radio frequency simulation has a history of several decades. Hardware-in-the-loop radio frequency simulation laboratories have been established in some major countries, including the United States, Russia, the United Kingdom, etc. In our country, hardware-in-the-loop radio frequency simulation laboratories have also been established in relevant scientific research institutions. These hardware-in-the-loop radio frequency simulation laboratories are built in microwave anechoic chambers. In a microwave anechoic chamber, there is an antenna array wall with antenna radiation units evenly distributed. Usually, three adjacent radiation units are distributed in an equilateral triangle to form a triple. At the other end of the microwave anechoic chamber, there is a three-axis turntable on which the electronic system to be tested is placed. To simulate the echo of a point target in a certain azimuth, three radiation units that are closest in distance and surround the point target in azimuth can be selected, which is called a triple. The three units of this triple simultaneously radiate the same echo signal to be simulated, and the radiation field amplitudes of the three units conform to a certain proportional relationship, so that the energy flow direction of the synthesized field is the same as the energy flow direction of the echo of the point target to be simulated. In this way, the echo of the point target is simulated in the laboratory. By changing the proportional relationship of the feeding coefficients of the triple, the energy flow direction of the synthesized field can be quickly adjusted, so as to simulate the echo of a point target moving rapidly in an outdoor field environment.

[0004] Traditional hardware-in-the-loop radio frequency simulation mainly targets point targets. However, with the development of radar technology, the resolution of targets is getting higher and higher. Modeling a target as a single scattering center can no longer meet the requirements of the rapidly developing radar technology. Therefore, multiple scattering centers are usually required to represent complex targets. For common targets, such as airplanes and large ships, the number of their scattering centers can often reach dozens or even hundreds. At this time, if the triple is still used to simulate each scattering center one by one, the number of triples required will reach an impossible level in engineering.

[0005] Therefore, the main disadvantages of the existing technology are: a large number of triples are required, a large number of channels are required, and the engineering feasibility is poor. Summary of the Invention

[0006] The embodiments of the present invention provide a semi-physical radio frequency simulation method for multiple scattering centers, which can reduce the requirements for the number of triplets and simulation channels while ensuring simulation accuracy, thereby better implementing semi-physical radio frequency simulation for multiple scattering centers under the condition of a limited number of simulation channels in semi-physical radio frequency simulation. The technical solution is as follows:

[0007] Establish a mathematical coordinate system for the simulation scene;

[0008] Grouping the multiple scattering centers according to the mathematical coordinate system of the established simulation scenario;

[0009] Combine the scattering centers in each group into one scattering center;

[0010] Calculate the feed coefficient of the HIL RF simulation triplet of the synthetic scattering center of each group.

[0011] Furthermore, establishing a mathematical coordinate system for the simulation scene includes:

[0012] The center point of the radiation aperture of the seeker is used as the coordinate origin to establish an xyz rectangular coordinate system; wherein, the radiation aperture of the seeker is the xy plane, the two orthogonal baseline directions of the seeker antenna array are the x direction and the y direction respectively, and the coordinates of the i-th radiation unit in the triplet are (x i ,y i ,z i ), z i >>x i ,y i , i = 1, 2, 3; then the angular position of the i-th radiation element in the triplet relative to the z-axis in the x and y directions is:

[0013]

[0014]

[0015] Where asin(·) represents the inverse sine function, are the angular positions of the i-th radiation element in the triplet relative to the z-axis in the x-direction and y-direction respectively;

[0016] Let the coordinates of the first scattering center be (x, y, z), z>>x, y, then the angular position of the first scattering center in the x and y directions relative to the z axis is:

[0017]

[0018]

[0019] Wherein, the first scattering center is any scattering center, ψ x , ψy They are respectively the angular positions of the first scattering center relative to the z-axis in the x and y directions.

[0020] Further, the grouping of multiple scattering centers according to the established mathematical coordinate system of the simulation scenario includes:

[0021] A1. Divide all the scattering centers into several groups;

[0022] A2. According to the angular positions and scattering coefficients of the scattering centers, estimate the angular positions of the combined scattering centers in different grouping forms, and determine whether the angular positions of the combined scattering centers in each group all fall within the radiation antenna array plane. If so, the grouping is completed; otherwise, return to step A1 to re-perform the grouping operation.

[0023] Further, the combining of the scattering centers in each group into one scattering center includes:

[0024] After grouping, calculate the combined electric field and magnetic field of each group;

[0025] According to the calculated combined electric field and magnetic field of each group, calculate the direction of the energy flux density vector of each group to obtain the angular position of the combined scattering center of each group where, represents the angular position of the combined scattering center of the m-th group relative to the z-axis in the x and y directions, m m = 1, 2,..., M, and M is the number of groups.

[0026] Further, the calculation of the feeding coefficients of the semi-physical RF simulation triplets of the combined scattering centers of each group includes:

[0027] Calculate the feeding coefficients of the semi-physical RF simulation triplets of the combined scattering centers at.

[0028] The beneficial effects brought by the technical solutions provided in the embodiments of the present invention at least include:

[0029] In the embodiments of the present invention, a mathematical coordinate system is established for the simulation scenario; according to the established mathematical coordinate system of the simulation scenario, multiple scattering centers are grouped; the scattering centers in each group are combined into one scattering center; and the feeding coefficients of the semi-physical RF simulation triplets of the combined scattering centers of each group are calculated. In this way, by appropriately grouping the scattering centers and combining the scattering centers in each group, the requirements for the number of triplets and the number of simulation channels can be reduced while ensuring the simulation accuracy, so as to better realize the semi-physical RF simulation of multiple scattering centers under the condition of limited simulation channels in the semi-physical RF simulation. Description of the Drawings

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0031] Figure 1 It is a schematic flow chart of the hardware-in-the-loop radio frequency simulation method for multiple scattering centers provided by the embodiments of the present invention;

[0032] Figure 2 It is a schematic diagram of the simulation scene coordinates provided by the embodiments of the present invention;

[0033] Figure 3 It is a schematic diagram of the scattering center grouping provided by the embodiments of the present invention. Specific Embodiments

[0034] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will further describe the embodiments of the present invention in detail with reference to the accompanying drawings.

[0035] As Figure 1 shown, the embodiments of the present invention provide a hardware-in-the-loop radio frequency simulation method for multiple scattering centers, including:

[0036] S101, establish a mathematical coordinate system for the simulation scene for convenient analysis;

[0037] In this embodiment, taking the center point of the radiation aperture surface of the seeker as the coordinate origin, an xyz rectangular coordinate system is established; wherein, taking the radiation aperture surface of the seeker as the xy plane, the two orthogonal baseline directions of the seeker antenna array are the x direction and the y direction respectively, and the coordinates of the i-th radiation unit in the triplet are (x i , y i , z i ), z i >> x i , y i , i = 1, 2, 3; then the angular positions of the i-th radiation unit in the triplet in the x and y directions relative to the z-axis are:

[0038]

[0039]

[0040] wherein, asin(·) represents the arcsine function, are respectively the angular positions of the i-th radiation unit in the triplet in the x direction and the y direction relative to the z-axis, and are used to indicate the directions where each radiation unit in the triplet is located;

[0041] Let the coordinates of the first scattering center be (x, y, z), where z >> x, y. Then the angular positions of the first scattering center in the x and y directions relative to the z-axis are as follows:

[0042]

[0043]

[0044] where the first scattering center is any scattering center, and ψ x and ψ y are the angular positions of the first scattering center in the x and y directions relative to the z-axis respectively, indicating the direction where the scattering center is located, as shown in Figure 2 Figure.

[0045] S102. Group the multiple scattering centers according to the established mathematical coordinate system of the simulation scenario. Specifically, the following steps may be included:

[0046] A1. Divide all the scattering centers into several groups;

[0047] In this embodiment, the hardware-in-the-loop radio frequency simulation can provide 4 groups of triples working simultaneously. Therefore, the 16 scattering centers can be divided into 4 groups, as shown in Figure 3 Figure.

[0048] A2. Estimate the angular positions of the combined scattering centers in different grouping forms according to the angular positions and scattering coefficients of the scattering centers, and determine whether the angular positions of the combined scattering centers in each group fall within the radiation antenna array plane. If so, the grouping is completed; otherwise, return to step A1 to perform the grouping operation again.

[0049] In this embodiment, assume there are 16 scattering centers, whose angular positions are where n is the number of scattering centers, and their scattering coefficients are A n exp(jα n ), where A n and α n are real numbers, A n is the amplitude of the nth scattering center, and α n is its phase.

[0050] In this embodiment, according to the angular positions and scattering coefficients of the scattering centers, use the centroid formula or the simplified angle scintillation equation to estimate the angular positions of the combined scattering centers in different grouping forms until a grouping is found such that the angular positions of the combined scattering centers in each group fall within the radiation antenna array plane.

[0051] S103. Combine the scattering centers in each group into one scattering center. Specifically, the following steps may be included:

[0052] B1, after grouping, calculate the combined electric field and magnetic field of each group;

[0053] B2, according to the calculated combined electric field and magnetic field of each group, calculate the direction of the energy flux density vector of each group to obtain the angular position of the combined scattering center of each group wherein, represents the angular position of the combined scattering center of the m-th group relative to the z-axis in the x-direction and y-direction, m = 1, 2,..., M, and M is the number of groups.

[0054] In this embodiment, in S102, since multiple calculations are required to select the grouping, an approximate formula is used to estimate the angular position of the combined scattering center of each group. After the grouping is determined, an accurate calculation formula is used to calculate the angular position of the combined scattering center of each group

[0055] In this embodiment, if the scattering centers are divided into 4 groups, then record the angular positions of the combined scattering centers of each group as

[0056] S104, calculate the feeding coefficients of the semi-physical RF simulation triplets of the combined scattering centers of each group.

[0057] In this embodiment, according to the centroid formula and the near-field correction table, calculate the feeding coefficients of the semi-physical RF simulation triplets of the combined scattering centers at, and perform semi-physical RF simulation.

[0058] For the semi-physical RF simulation method of multiple scattering centers described in the embodiments of the present invention, in the embodiments of the present invention, a mathematical coordinate system is established for the simulation scenario; according to the established mathematical coordinate system of the simulation scenario, the multiple scattering centers are grouped; the scattering centers in each group are combined into one scattering center; calculate the feeding coefficients of the semi-physical RF simulation triplets of the combined scattering centers of each group. In this way, by appropriately grouping the scattering centers and combining the scattering centers in each group, the requirements for the number of triplets and the number of simulation channels can be reduced while ensuring the simulation accuracy, so as to better realize the semi-physical RF simulation of multiple scattering centers in the case of limited simulation channels in the semi-physical RF simulation.

[0059] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hardware-in-the-loop radio frequency simulation method for multiple scattering centers, characterized in that Including: Establish a mathematical coordinate system for the simulation scenario; Group the multiple scattering centers according to the established mathematical coordinate system of the simulation scenario; Synthesize the scattering centers in each group into one scattering center; Calculate the feeding coefficients of the semi-physical RF simulation triples of the synthesized scattering centers in each group; Among them, the grouping of the multiple scattering centers according to the established mathematical coordinate system of the simulation scenario includes: A1. Divide all the scattering centers into several groups; A2. Estimate the angular positions of the synthesized scattering centers in each combination under different grouping forms according to the angular positions and scattering coefficients of the scattering centers, and determine whether the angular positions of the synthesized scattering centers in each group all fall within the radiation antenna array plane. If so, the grouping is completed; otherwise, return to step A1 to re-perform the grouping operation.

2. The semi-physical radio frequency simulation method for multiple scattering centers according to claim 1, wherein The establishment of the mathematical coordinate system for the simulation scenario includes: Taking the center point of the radiation aperture surface of the seeker as the coordinate origin, an xyz rectangular coordinate system is established; among them, taking the radiation aperture surface of the seeker as the xy plane, the two orthogonal baseline directions of the seeker antenna array are the x direction and the y direction respectively, and the coordinates of the i-th radiation element in the triple are (x i , y i , z i ), z i >>x i , y i , i = 1, 2, 3; then the angular positions of the i-th radiation element in the triple with respect to the z-axis in the x and y directions are: where, asin(·) represents the arcsine function, are respectively the angular positions of the i-th radiation element in the triple with respect to the z-axis in the x-direction and y-direction; Let the coordinates of the first scattering center be (x, y, z), where z >> x, y. Then the angular positions of the first scattering center in the x and y directions relative to the z-axis are: Among them, the first scattering center is any scattering center, ψ x , ψ y are respectively the angular positions of the first scattering center relative to the z-axis in the x-direction and y-direction.

3. The semi-physical RF simulation method of a multi-scattering center according to claim 1, characterized in that The synthesis of the scattering centers in each group into one scattering center includes: After grouping, calculate the synthesized electric and magnetic fields of each group; According to the calculated combined electric and magnetic fields of each group, calculate the direction of the energy flux density vector of each group to obtain the angular positions of the combined scattering centers of each group. Among them, represents the angular positions of the combined scattering center of the m-th group relative to the z-axis in the x and y directions, where m = 1, 2,..., M, and M is the number of groups.

4. The semi-physical RF simulation method for multiple scattering centers according to claim 3, wherein The calculation of the feeding coefficients of the semi-physical RF simulation triples of the synthesized scattering centers in each group includes: Calculation The feeding coefficient of the hardware-in-the-loop RF simulation triple of the synthetic scattering center at

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