CN113296065A - Simulation method for micro cone target radar echo signal - Google Patents

Simulation method for micro cone target radar echo signal Download PDF

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CN113296065A
CN113296065A CN202110406261.3A CN202110406261A CN113296065A CN 113296065 A CN113296065 A CN 113296065A CN 202110406261 A CN202110406261 A CN 202110406261A CN 113296065 A CN113296065 A CN 113296065A
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cone
radar
simulation
target
incident angle
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CN113296065B (en
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华煜明
金胜
王洋
朱天林
刘卿
黄璐
张健
王东亚
王玥
降佳伟
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63921 Troops of PLA
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/40—Means for monitoring or calibrating
    • G01S7/4052—Means for monitoring or calibrating by simulation of echoes

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

The invention discloses a method for simulating radar echo signals of a micro cone target, and relates to the technical field of radar target characteristic simulation. The technical scheme of the invention comprises the following steps: a three-dimensional model of the cone target is set. Selecting radar signal parameters for simulation, performing electromagnetic simulation calculation on the cone target model, changing the incident angle from 0 degree to 180 degrees, performing electromagnetic simulation calculation according to equal-interval sampling, and obtaining full-view electromagnetic simulation data. And calculating the time sequence of the change of the incident angle of the electromagnetic wave transmitted by the radar to the cone target according to the micro-motion type and the micro-motion parameters. And according to the incident angle change time sequence, extracting echo data corresponding to the incident angle from the full-view electromagnetic simulation data, and arranging according to the time sequence to obtain the simulation data of the radar echo signal of the cone target.

Description

Simulation method for micro cone target radar echo signal
Technical Field
The invention relates to the technical field of radar target characteristic simulation, in particular to a method for simulating radar echo signals of a micro cone target.
Background
The micro motion refers to small-amplitude, high-frequency and periodic reciprocating motion of a target in the flight process, for example, spinning, precession and nutation of a missile all belong to micro motion, and the micro motion can generate an obvious modulation effect on a radar signal and is always taken as an important means for target identification. In the technical field of missile target identification, the micro-motion characteristic of a cone target is always a focus of researchers, and a ballistic missile warhead and a bait thereof for shielding are usually designed by adopting an aerodynamic shape of a smooth symmetrical cone.
Simulation is an important way for developing the research on the echo characteristics of a micromotion cone target radar, the existing simulation method mainly comprises two types, the first type is to simplify a target into a structure consisting of a plurality of ideal scattering points, so that the echo of the target is approximated to the sum of echo signals of the scattering points, and during the specific simulation, the modulation mode of the radar echo by the scattering points is obtained by calculating the spatial position change of each scattering point in the micromotion process of the target, and finally the simulation data of the radar echo signals of the micromotion target are obtained. The method has a simple principle and small calculated amount, but because the modulation mechanism of the radar signal and the target is complex, the actual scattering center is often different from an ideal scattering point model, and factors such as scattering point shielding, strength change and the like are ignored, so that the reduction degree of the simulation result on the real situation is poor. The second method firstly makes a three-dimensional digital model or a scaled physical model close to a target, sets a state process of micro-motion change of the target in advance, and obtains a radar echo signal of the micro-motion target through electromagnetic simulation calculation or microwave darkroom irradiation.
Therefore, a simulation technology of the micro cone target radar echo signal with high efficiency and high reduction degree is needed at present.
Disclosure of Invention
In view of this, the invention provides a method for simulating a radar echo signal of a micro-motion cone target, which can obtain simulation data of a radar echo signal of a micro-motion cone target with higher reduction degree in a lower-cost and more efficient manner.
In order to achieve the purpose, the technical scheme of the invention comprises the following steps:
and S1, setting a three-dimensional model of the cone target.
S2, selecting radar signal parameters for simulation, performing electromagnetic simulation calculation on the cone target model, changing the incident angle from 0 degree to 180 degrees, performing electromagnetic simulation calculation according to equal-interval sampling, and obtaining full-view electromagnetic simulation data.
And S3, calculating the time sequence of the change of the incident angle of the electromagnetic wave transmitted by the radar to the cone target according to the micro-motion type and the micro-motion parameters.
And S4, extracting echo data corresponding to the incident angle from the full-view-angle electromagnetic simulation data according to the incident angle change time sequence, and arranging the echo data according to the time sequence to obtain the simulation data of the radar echo signal of the cone target.
Further, setting a three-dimensional model of the cone target, including setting the height of the cone, the cone top spherical radius, the cone bottom radius and the half cone angle parameters.
Further, selecting radar signal parameters for simulation, performing electromagnetic simulation calculation on the cone target model, changing an incident angle from 0 degree to 180 degrees, performing electromagnetic simulation calculation according to equal-interval sampling, and obtaining full-view electromagnetic simulation data, wherein the method specifically comprises the following steps:
and setting parameters of the radar signal for simulation to be a frequency point every 16MHz from 9GHz to 11GHz, changing the incident angle of the radar signal for simulation from 0 degree to 180 degrees, and performing electromagnetic simulation calculation according to a sampling interval of 0.1 degree to obtain full-view electromagnetic simulation data.
Furthermore, the full-view electromagnetic simulation data is a complex matrix of 129 × 1801, and includes broadband echo simulation data of the cone target under 1801 different incident angles, where each broadband echo simulation data is a complex vector of 129 × 1 dimensions formed by echo simulation data of each frequency point under the corresponding incident angle, and a real part and an imaginary part of a single frequency point echo simulation data respectively represent an electric field strength and an magnetic field strength of a position where the radar is located.
Further, according to the micro-motion type and the micro-motion parameters, a time sequence of the change of the incidence angle of the electromagnetic waves transmitted by the radar to the cone target is calculated, and the method specifically comprises the following steps:
the cone target is a smooth cone, and the micro-motion type is precession;
calculating the variation function of the incident angle of the electromagnetic wave transmitted by the radar, wherein the variation function of the incident angle of the precession cone is
Figure BDA0003022398830000031
Wherein a and
Figure BDA0003022398830000032
the pitch angle and the azimuth angle of the radar sight line are respectively; beta is aCThe precession angle is the included angle between the cone axis and the precession axis; f. ofCIs the precession frequency; t is the current time;
and calculating the time sequence of the change of the incident angle of the cone target by the electromagnetic waves transmitted by the radar according to the incident angle change function of the precession cone.
Has the advantages that:
1. the simulation method for the radar echo signal of the micro cone target provided by the embodiment of the invention has high micro simulation reduction degree, and can truly reflect the factors such as signal periodicity, shielding effect, scattering point position and intensity change, irrational scattering center, micro Doppler modulation and the like existing when a radar detects the micro target.
2. The simulation method of the radar echo signal of the micro-motion cone target provided by the embodiment of the invention has high simulation efficiency, and when various micro-motion conditions of the same target are simulated, the method provided by the invention can use the same group of full-view electromagnetic simulation data, so that the workload of repeatedly performing electromagnetic calculation is reduced.
3. The simulation method of the radar echo signal of the micro cone target provided by the embodiment of the invention has the advantages of simple principle and strong operability.
Drawings
FIG. 1 is a schematic flow chart of a simulation method according to the present invention;
FIG. 2 is a three-dimensional pyramidal object model simulated in step one of the present invention; fig. 2 (a) is a schematic diagram of model parameter setting; FIG. 2 (b) is a perspective view of the three-dimensional pyramidal object model; FIG. 2 (c) is another perspective view of the three-dimensional pyramidal object model;
fig. 3 is a view angle variation curve of the precession cone calculated in step three.
FIG. 4 is a high-resolution one-dimensional range profile sequence obtained by pulse compression of precession cone radar echoes obtained by simulation in step four, which reflects the position change relationship of scattering points on the cone surface;
fig. 5 is a time-frequency transformation result of the precession cone radar echo obtained by simulation in step four, which reflects the variation of the micro doppler frequency of the scattering point caused by precession.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The invention provides a method for simulating an echo signal of a micro cone target radar, which comprises the following specific steps:
step 1, designing a cone target model in the example according to the shape parameters of the civil soldier III warhead, as shown in fig. 2a, the parameters which are required to be set when the simulation model is manufactured mainly comprise the height h of the cone, the radius a of the cone bottom, the radius b of the cone top sphere, the half cone angle gamma and the like, and the target three-dimensional model in the example is shown in fig. 2a and 2 c.
Step 2, setting radar simulation signal parameters to be one frequency point (129 frequency points) every 16MHz from 9GHz to 11GHz, changing an incidence angle from 0 degree (right to a cone top) to 180 degrees (right to a cone bottom), performing electromagnetic simulation calculation according to 0.1 degree intervals to obtain full-view electromagnetic simulation data, wherein the data is a complex matrix of 129 multiplied by 1801 and comprises broadband echo simulation data of the cone under 1801 different incidence angles, each broadband echo simulation data is a complex vector of 129 multiplied by 1 dimension formed by the echo simulation data of each frequency point under a corresponding visual angle, and a real part and an imaginary part of the single frequency point echo simulation data respectively represent the electric field intensity and the magnetic field intensity of the position where the radar is located.
Step 3, aiming at the smooth cone with the precession mode, calculating a change function of the incident angle of the electromagnetic wave transmitted by the radar, wherein the precession refers to the phenomenon that a cone shaft rotates around another rotating shaft (namely a precession shaft) when the cone rotates, and the change function of the incident angle of the precession cone is
Figure BDA0003022398830000051
Wherein a and
Figure BDA0003022398830000052
the pitch angle, azimuth angle and precession angle beta of radar sight lineCIs the included angle between the cone axis and the precession axis, and the precession frequency is fC。
In this example, assume that the radar line-of-sight angle α is 125 ° in elevation angle α, and azimuth angle α
Figure BDA0003022398830000053
Precession angle betaC15 °, precession frequency fCAt 0.287Hz, the time series of changes in the incident angle of the precession cone target can be calculated according to equation (1), as shown in fig. 3.
And 4, extracting echo data of corresponding angles from the full-view-angle electromagnetic simulation data according to the incident angle change time sequence, and arranging according to the time sequence to obtain radar echo simulation data of the micro-motion cone target.
The simulated echo data is subjected to pulse compression processing to obtain a high-resolution one-dimensional range profile sequence, the obtained result is shown in fig. 4, and three curves from bottom to top sequentially represent cone bottom scattering points P1、P2And the position change condition of the cone top scattering point A, the data obviously reflects various electromagnetic scattering characteristics such as motion periodicity, scattering point position change, intensity change, shielding effect and the like, and the method provided by the aspect has higher simulation reduction degree in a time domain.
The data of a part of range cells are extracted from the high-resolution one-dimensional range profile sequence to be subjected to time-frequency transformation, and the obtained result is shown in fig. 5, which reflects the change situation of the micro-doppler frequency of the scattering point caused by precession, and shows that the method provided by the invention also has higher simulation reduction degree in the frequency domain.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. The method for simulating the radar echo signal of the micro cone target is characterized by comprising the following steps of:
s1, setting a three-dimensional model of the cone target;
s2, selecting radar signal parameters for simulation, performing electromagnetic simulation calculation on the cone target model, changing the incident angle from 0 degree to 180 degrees, performing electromagnetic simulation calculation according to equal-interval sampling, and obtaining full-view electromagnetic simulation data;
s3, calculating a time sequence of the change of the incident angle of the radar-transmitted electromagnetic wave to the cone target according to the micro-motion type and the micro-motion parameters;
and S4, extracting echo data corresponding to the incident angle from the full-view electromagnetic simulation data according to the incident angle change time sequence, and arranging the echo data according to the time sequence to obtain the simulation data of the radar echo signal of the cone target.
2. The method of claim 1, wherein setting the three-dimensional model of the cone target comprises setting a height, a cone apex spherical radius, a cone base radius, and half cone angle parameters of the cone.
3. The method of claim 1, wherein the selecting radar signal parameters for simulation, performing electromagnetic simulation calculations on a cone target model, changing an incident angle from 0 ° to 180 °, performing electromagnetic simulation calculations according to equally spaced sampling, and obtaining full-view electromagnetic simulation data specifically comprises:
and setting the parameters of the radar signal for simulation to be one frequency point every 16MHz from 9GHz to 11GHz, changing the incident angle of the radar signal for simulation from 0 degree to 180 degrees, and performing electromagnetic simulation calculation according to a sampling interval of 0.1 degree to obtain full-view electromagnetic simulation data.
4. The method of claim 3, wherein the full-view electromagnetic simulation data is a 129 x 1801 complex matrix containing wideband echo simulation data of the cone target under 1801 different incident angles, wherein each wideband echo simulation data is a 129 x 1 complex vector composed of echo simulation data of frequency points under corresponding incident angles, and real parts and imaginary parts of the single frequency point echo simulation data respectively represent electric field intensity and magnetic field intensity of a location where the radar is located.
5. The method as claimed in claim 1, wherein the step of calculating the time sequence of the change of the incidence angle of the electromagnetic wave transmitted by the radar to the cone target according to the micromotion type and the micromotion parameter comprises the following steps:
the cone target is a smooth cone, and the micro-motion type is precession;
calculating the variation function of the incident angle of the electromagnetic wave transmitted by the radar, wherein the variation function of the incident angle of the precession cone is
Figure FDA0003022398820000021
Wherein a and
Figure FDA0003022398820000022
the pitch angle and the azimuth angle of the radar sight line are respectively; beta is aCThe precession angle is the included angle between the cone axis and the precession axis; f. ofCIs the precession frequency; t is the current time;
and calculating the time sequence of the change of the incidence angle of the cone target by the electromagnetic waves transmitted by the radar according to the incidence angle change function of the precession cone.
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Cited By (1)

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CN114488060A (en) * 2022-01-10 2022-05-13 武汉大学 Method for resolving phase difference of meteor echo signals between wind measuring radar receivers

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114488060A (en) * 2022-01-10 2022-05-13 武汉大学 Method for resolving phase difference of meteor echo signals between wind measuring radar receivers
CN114488060B (en) * 2022-01-10 2023-03-10 武汉大学 Method for resolving phase difference of meteor echo signals between wind measuring radar receivers

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