CN110456318B - Target echo simulation method, system, storage medium and terminal equipment - Google Patents
Target echo simulation method, system, storage medium and terminal equipment Download PDFInfo
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- CN110456318B CN110456318B CN201910771835.XA CN201910771835A CN110456318B CN 110456318 B CN110456318 B CN 110456318B CN 201910771835 A CN201910771835 A CN 201910771835A CN 110456318 B CN110456318 B CN 110456318B
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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
Abstract
The invention provides a target echo simulation method, a target echo simulation system, a storage medium and terminal equipment, which are used for generating target echo simulation data under the modulation of a plurality of range gates and antenna directional diagrams. The method comprises the following steps: calculating the central intensity of an echo signal according to the transmitting power, the antenna gain, the target reflection cross section area and the radar detection target electromagnetic wave propagation distance; after pulse compression, modulating the central intensity of the target echo at a plurality of range gates to obtain a compressed target echo signal; and carrying out secondary modulation on the echo intensity generated by distance modulation through an antenna directional diagram to obtain a modulated distance-direction two-dimensional target echo signal.
Description
Technical Field
The invention relates to the field of radar signal and data processing, in particular to a target echo simulation method, a target echo simulation system, a storage medium and terminal equipment, wherein antenna directional pattern modulation and pulse compression distance side lobe modulation are considered.
Background
In the field of radar signal and data processing, target echoes need to be simulated to generate simulated echo data for verifying the effectiveness of various signal processing and data processing algorithms.
At present, the simulation of target echo mostly adopts the simulation of echo data in a single range gate. In practice the target echo will cover multiple range gates in range and be modulated in azimuth intensity by the antenna pattern main lobe. If the target echo intensity is too strong, it is also modulated by the antenna pattern side lobes. Fig. 1 shows the acquired real target echo data, wherein the abscissa is the azimuth angle and the ordinate is the distance. Figure 2 is an echo of a single pulse repetition cycle target over distance. Figure 3 is a real target echo modulated by the antenna pattern main lobe. Therefore, the problem of modulation information loss of a plurality of range gates and antenna directional patterns exists in the simulation method of the echo data in a single range gate.
There are two basic methods for radar echo simulation: functional simulation and coherent video signal simulation. The functional simulation is the simplest method for radar echo simulation, which does not utilize the phase information of the signal and can only describe the amplitude of the radar echo, so that the simulation has a limited application.
Coherent video signal simulation utilizes the phase information of the signal, which is basically defined to realistically reproduce a coherent video signal containing both amplitude and phase, the overall process of transmission, spatial propagation, reflection by scatterers, and processing within the receiver of electromagnetic signals. The accuracy of the coherent video signal simulation can be made high as long as the object model and the environment model are provided sufficiently good. The fidelity of the coherent video signal simulation is mainly limited by a radar model and a target model environment model.
The inventor finds in the development process that the two simulation methods have the following disadvantages: only a single range gate signal of a target is simulated, and the fact that a strong target can cover a plurality of range gates in range is not considered, and the fact that a plurality of echo pulse trains in a single scanning period are modulated by an antenna pattern is not considered.
Disclosure of Invention
In view of this, the present invention provides a target echo simulation method, system, storage medium and terminal device considering antenna directional pattern modulation and range side lobe modulation, which generate target echo simulation data under multiple range gates and antenna directional pattern modulation.
In a first aspect, the technical solution of the target echo simulation method provided by the present invention is:
a method of target echo simulation, the method comprising the steps of:
calculating the central intensity of an echo signal according to the transmitting power, the antenna gain, the target reflection cross section area and the radar detection target electromagnetic wave propagation distance;
after pulse compression, distance modulation is carried out on the central intensity of the target echo at a plurality of distance gates to obtain a compressed target echo signal;
and carrying out secondary modulation on the strength of the target echo signal generated by distance modulation through an antenna directional diagram to obtain a modulated distance-azimuth two-dimensional target echo signal.
In a second aspect, the technical solution of the target echo simulation system provided by the present invention is:
a target echo simulation system, the system comprising:
the central intensity calculating module is used for calculating the central intensity of the echo signal according to the transmitting power, the antenna gain, the target reflection cross-sectional area and the radar detection target electromagnetic wave propagation distance;
the compression modulation module is used for performing distance modulation on the central intensity of the target echo at a plurality of distance gates after pulse compression to obtain a compressed target echo signal;
and the antenna directional diagram modulation module is used for carrying out secondary modulation on the intensity of the target echo signal generated by distance modulation through an antenna directional diagram to obtain a modulated distance-direction two-dimensional target echo signal.
In a third aspect, a technical solution of a computer-readable storage medium provided by the present invention is:
a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the target echo simulation method as described above.
In a fourth aspect, a technical solution of a terminal device provided by the present invention is:
a terminal device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps in the target echo simulation method as described above when executing the program.
The method considers that a strong target possibly covers a plurality of range gates in distance, also considers that a plurality of echo pulse trains in a single scanning period are modulated by an antenna directional diagram, analyzes a plurality of pulse echoes in each scanning period of the radar, and generates target echo simulation data under the modulation of the plurality of range gates and the antenna directional diagram.
Drawings
The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:
FIG. 1 is a schematic illustration of real target echo acquisition data;
FIG. 2 is a schematic diagram of the distribution of single pulse echoes over distance;
FIG. 3 is a schematic illustration of a target echo under antenna pattern modulation;
FIG. 4 is a flow chart of a target echo simulation method according to an embodiment;
FIG. 5 is a schematic diagram of a distance distribution of a pulse compression signal according to an embodiment;
FIG. 6 is a schematic view of an exemplary embodiment;
FIGS. 7 (a) and 7 (b) are examples of an antenna pattern according to embodiments;
FIG. 8 is a schematic diagram of a simulated target echo according to an embodiment;
FIG. 9 is a block diagram showing the structure of a second target echo simulation system according to an embodiment.
Detailed Description
The invention is further described with reference to the following figures and examples.
Example one
Compared with a real target echo, the current simulation data is mainly in amplitude distribution of a plurality of range gates and modulation of an antenna directional pattern, and in order to solve the technical problem, the embodiment provides a target echo simulation method considering adjustment of the antenna directional pattern and a distance side lobe.
Referring to fig. 4, the target echo simulation method includes the following steps:
and S101, calculating the central intensity of the echo signal according to the transmitting power, the antenna gain, the target reflection cross section area and the radar detection target electromagnetic wave propagation distance.
Specifically, the method for calculating the central intensity of the echo signal includes:
wherein, P r Is the power of the received echo signal; p is t Is the transmit power; g t Is the antenna gain; σ is the reflection sectional area of the target; a. The r Is the aperture area of the receive antenna; r is the target to radar distance.
And S102, after pulse compression, modulating the central intensity of the target echo at a plurality of range gates to obtain a compressed target echo signal.
In order to solve the problem of target distribution on the range gate, the modern radar almost completely adopts a pulse compression system, so that the distribution of echo data on the range gate is in the form of a sinc function. When chirp compression is employed, the compressed signal output is:
where B is the signal bandwidth, τ is the pulse width, t d The time delay of the echo with respect to the time instant of the transmit pulse. When B =10MHz, τ =100us d The distribution of the echo of =750us on the range gate is shown in fig. 5.
In the embodiment, a plurality of pulse echoes in each scanning period of the radar are analyzed, and when linear frequency modulation pulse compression is adopted, the distribution data on a plurality of range gates solves the problem of target distribution on the range gates.
S103, carrying out secondary modulation on the central intensity of the target echo through an antenna directional diagram to obtain a modulated distance-direction two-dimensional target echo signal.
When the radar antenna scans the target, a plurality of transmitted pulses are irradiated to the target, the intensity of the echo pulse train received by the radar is modulated by the main lobe of the directional diagram of the antenna, and when the echo of the target is too strong, the intensity of the echo pulse train is modulated by the auxiliary lobe of the antenna, as shown in fig. 3.
In this embodiment, a modified sinc () function is used to form the tableThe modulation of the strength of the echo pulse train by the antenna is shown. Theta for radar antenna beam width 3dB The 1 st side lobe level is represented by G 1 The 2 nd sidelobe level is represented by G (unit: dB) 2 The nth sidelobe level is represented by G in dB n (unit: dB) indicates that the angle of the azimuth of the target at a time when the antenna scans the target is θ, as shown in fig. 6. The angle is given in radians (rad). Depending on the nature of the function sinc (), the antenna pattern satisfying the above condition can be represented as:
wherein, G (θ) is a piecewise function, and the sidelobe levels of the antenna pattern are expressed by the piecewise function G (θ), which is expressed as follows:
if take θ 3dB ＝2°，G 1 ＝-35dB，G 2 = 45dB, then the radar antenna pattern is as shown in fig. 7 (a) and 7 (b).
In the embodiment, the problem that a plurality of echo pulse trains in a single scanning period are modulated by an antenna directional diagram is considered, the modulation condition of the antenna on the intensity of the echo pulse trains is represented by a modified sinc () function, and the defect that the intensity of the echo pulse trains is also modulated by an antenna side lobe when a target echo is too strong is overcome.
The modulated range-azimuth two-dimensional target echo signal can be given by:
wherein s is 0 (t) is a voltage distribution function of the target echo over a plurality of range gates; f (θ) is an antenna pattern function.
An example of the target echo signal obtained according to equation (4) is shown in fig. 8, and it can be seen that it is very similar to the real echo of fig. 1.
The target echo simulation system provided by the embodiment considers that a strong target possibly covers a plurality of range gates in distance, and also considers that a plurality of echo pulse trains in a single scanning period are modulated by an antenna pattern, analyzes a plurality of pulse echoes in each scanning period of a radar, and generates target echo simulation data under the modulation of the plurality of range gates and the antenna pattern.
Example two
Compared with a real target echo, the current simulation data is mainly in amplitude distribution of a plurality of range gates and modulation of an antenna directional pattern, and in order to solve the technical problem, the embodiment provides a target echo simulation system considering adjustment of the antenna directional pattern and a distance side lobe.
Referring to fig. 9, the target echo simulation system includes:
a central intensity calculating module 201, configured to calculate a central intensity of an echo signal according to the transmission power, the antenna gain, the target reflection cross-sectional area, and the radar detection target electromagnetic wave propagation distance;
the compression modulation module 202 is used for modulating the central intensity of the target echo at a plurality of range gates after pulse compression to obtain a compressed target echo signal;
and the antenna directional pattern modulation module 203 is configured to perform secondary modulation on the echo intensity generated by distance modulation through an antenna directional pattern to obtain a modulated distance-azimuth two-dimensional target echo signal.
In this embodiment, the compression modulation module has a function of:
when the linear frequency modulation pulse compression is adopted, the distribution of the compressed target echoes on a plurality of range gates is as follows:
where B is the signal bandwidth, τ is the pulse width, t d Is the time delay of the echo relative to the time of the transmit pulse.
In this embodiment, the antenna pattern modulation module is specifically configured to:
and adopting the modified sinc function to express the modulation condition of the antenna on the intensity of the echo pulse train. According to the property of the function sinc, an antenna directional diagram meeting the following conditions is constructed:
theta for radar antenna beam width 3dB The 1 st side lobe level is represented by G 1 The 2 nd sidelobe level is represented by G (unit: dB) 2 The nth sidelobe level is represented by G in dB n (unit: dB) indicates that the angle of the azimuth of the target at a time when the antenna scans the target is θ.
The respective sidelobe levels of the antenna pattern are represented by a piecewise function G (θ), which is expressed by the following equation:
the modulated range-azimuth two-dimensional target echo signal can be given by:
wherein s is 0 (t) distribution data of target echoes on a plurality of range gates; f (θ) is data of the antenna pattern.
EXAMPLE III
The present embodiment provides a computer-readable storage medium on which a computer program is stored, which program, when being executed by a processor, carries out the steps in the target echo simulation method as shown in fig. 4.
Example four
The embodiment provides a computer device, which includes a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the target echo simulation method shown in fig. 4.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by a computer program, which may be stored in a computer readable storage medium and executed by a computer to implement the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present disclosure, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive changes in the technical solutions of the present invention.
Claims (6)
1. A method of target echo simulation, comprising the steps of:
calculating the central intensity of an echo signal according to the transmitting power, the antenna gain, the target reflection cross section area and the radar detection target electromagnetic wave propagation distance;
after pulse compression, distance modulation is carried out on the central intensity of the target echo at a plurality of distance gates, and a linear frequency modulation pulse compression radar is adopted to obtain a compressed target echo signal:
where B is the signal bandwidth, τ is the pulse width, t d Time delay of the echo center relative to the time of transmitting pulse;
carrying out secondary modulation on the intensity of a target echo signal generated by distance modulation through an antenna directional diagram to obtain a modulated distance-azimuth two-dimensional target echo signal, wherein the antenna directional diagram is as follows:
wherein, theta 3dB Is the radar antenna beam width; sinc () is a sinc function; theta is the azimuth angle of the target at a certain moment when the antenna scans the target; g (θ) is a piecewise function representing the respective side lobe levels of the antenna pattern.
2. A method for target echo simulation according to claim 1, wherein the piecewise function G (θ) is expressed by:
wherein, theta 3dB Is the radar antenna beam width; theta is an included angle of the direction of the target at a certain moment when the antenna scans the target; n is the number of sidelobe levels; g i I =1, 2.... Cndot.n, for the ith side lobe level.
3. A target echo simulation method according to claim 1, characterized in that the distance-azimuth two-dimensional target echo signal is expressed by:
where f (θ) is the antenna pattern data.
4. A target echo simulation system, comprising:
the central intensity calculation module is used for calculating the central intensity of the echo signal according to the transmitting power, the antenna gain, the target reflection cross section area and the radar detection target electromagnetic wave propagation distance;
the compression modulation module is used for distance modulation of the central intensity of the target echo at a plurality of distance gates after pulse compression, and a linear frequency modulation pulse compression radar is adopted to obtain a compressed target echo signal:
where B is the signal bandwidth, τ is the pulse width, t d Time delay of the echo center relative to the time of transmitting pulse;
an antenna directional diagram modulation module, configured to perform azimuth secondary modulation on the strength of a target echo signal generated by distance modulation through an antenna directional diagram, to obtain a modulated distance-azimuth two-dimensional target echo signal, where the antenna directional diagram is:
wherein, theta 3dB Is the radar antenna beam width; sinc () is a sinc function; theta is the azimuth angle of the target at a certain moment when the antenna scans the target; g (θ) is a piecewise function representing the respective side lobe levels of the antenna pattern.
5. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method for target echo simulation according to any one of claims 1-3.
6. A terminal device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps in the target echo simulation method according to any of claims 1-3 when executing the program.
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