CN110456318A - A kind of target echo analogy method, system, storage medium and terminal device - Google Patents

A kind of target echo analogy method, system, storage medium and terminal device Download PDF

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Publication number
CN110456318A
CN110456318A CN201910771835.XA CN201910771835A CN110456318A CN 110456318 A CN110456318 A CN 110456318A CN 201910771835 A CN201910771835 A CN 201910771835A CN 110456318 A CN110456318 A CN 110456318A
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target
echo
target echo
signal
radiation pattern
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CN110456318B (en
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夏栋
丁友宝
彭志刚
李大龙
吴凌燕
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Qingdao Campus of Naval Aviation University 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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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The present invention provides a kind of target echo analogy method, system, storage medium and terminal device, generates target echo analogue data under multiple range gates and antenna radiation pattern modulation.Method includes the following steps: going out the center intensity of echo-signal according to transmission power, antenna gain, target reflection cross section and radar detection target electromagnetic wave flight distance calculation；After pulse compression, target echo center intensity is modulated in multiple range gates, obtains compressed target echo signal；The echo strength modulated and generated of being adjusted the distance by antenna radiation pattern carries out secondary modulation, obtains modulated range-azimuth two-dimensional targets echo-signal.

Description

A kind of target echo analogy method, system, storage medium and terminal device
Technical field
The present invention relates to radar signal and data processing field, particularly a kind of consideration antenna radiation pattern modulation and arteries and veins Target echo analogy method, system, storage medium and the terminal device of punching press contracting range sidelobe modulation.
Background technique
It in radar signal and data processing field, needs to simulate target echo, generates analogue echo data, be used to Verify the validity of various signal processings and data processing algorithm.
The simulation of target echo mostly uses the simulation of echo data in single range gate at present.Actually target echo away from From can above cover multiple range gates, and modulation of the intensity by antenna radiation pattern main lobe in orientation.If target echo is strong It spends by force, also suffers from the modulation of antenna radiation pattern secondary lobe.Fig. 1 is collected real goal echo data, wherein abscissa For azimuth, ordinate is distance.Fig. 2 is single pulse repetition period target apart from upper echo.Fig. 3 is by antenna side The real goal echo modulated to figure main lobe.As it can be seen that the analogy method of echo data exists in multiple distances in single range gate Door and antenna radiation pattern modulation intelligence lack problem.
There are two types of basic skills for radar echo simulation: functional simulation and coherent video simulation.Functional simulation is radar The simplest method of analogue echoes, it does not utilize the phase information of signal, can only describe the amplitude of radar return, thus this The purposes of analoglike is very limited.
Coherent video simulates the phase information that signal is utilized, its basic definition seeks to realistically reappear both Again include the coherent video of phase comprising amplitude, reappear the transmitting of electromagnetic wave signal, spatial, be scattered body reflection, And the overall process handled in receiver.As long as provided object module and environmental model are good enough, so that it may so that The precision of coherent video simulation is very high.The fidelity of coherent video simulation is mainly by radar mockup, object module The limitation of environmental model.
Inventor has found that two kinds of above-mentioned analogy methods have the disadvantage that only to the list where target in R&D process A to be simulated apart from gate signal, multiple range gates may above be covered by both not accounted for strong target in distance, more not examined Multiple echo impulse strings inside the single scan period are considered by the modulation of antenna radiation pattern.
Summary of the invention
In view of this, the present invention provides the target echo simulation of a kind of modulation of consideration antenna radiation pattern and range sidelobe modulation Method, system, storage medium and terminal device generate target echo under multiple range gates and antenna radiation pattern modulation and simulate number According to.
In a first aspect, a kind of technical solution of target echo analogy method provided by the invention is:
A kind of target echo analogy method, method includes the following steps:
According to transmission power, antenna gain, target reflection cross section and radar detection target electromagnetic wave propagation distance, calculate The center intensity of echo-signal；
After pulse compression, distance modulated is carried out to target echo center intensity in multiple range gates, obtains compressed mesh Mark echo-signal；
The target echo signal intensity modulated and generated of being adjusted the distance by antenna radiation pattern carries out secondary modulation, after obtaining modulation Range-azimuth two-dimensional targets echo-signal.
Second aspect, a kind of technical solution of target echo simulation system provided by the invention is:
A kind of target echo simulation system, the system include:
Center intensity computing module, for according to transmission power, antenna gain, target reflection cross section and radar detection mesh Electromagnetic wave propagation distance is marked, the center intensity of echo-signal is calculated；
Modulation module is compressed, after pulse compression, target echo center intensity is carried out apart from tune in multiple range gates System, obtains compressed target echo signal；
Antenna radiation pattern modulation module modulates the target echo signal intensity of generation for adjusting the distance by antenna radiation pattern Secondary modulation is carried out, modulated range-azimuth two-dimensional targets echo-signal is obtained.
The third aspect, a kind of technical solution of computer readable storage medium provided by the invention is:
A kind of computer readable storage medium, is stored thereon with computer program, realization when which is executed by processor Step in target echo analogy method as described above.
Fourth aspect, a kind of technical solution of terminal device provided by the invention is:
A kind of terminal device including memory, processor and stores the meter that can be run on a memory and on a processor Calculation machine program, the processor realize the step in target echo analogy method as described above when executing described program.
The present invention considers that strong target may above cover multiple range gates in distance, it is also considered that in the single scan period Multiple echo impulse strings in face are modulated by antenna radiation pattern, analyze multiple pulse echos in radar each scan period, Target echo analogue data is generated under multiple range gates and antenna radiation pattern modulation.
Detailed description of the invention
Attached drawing for a better understanding of the present invention, does not constitute an undue limitation on the present invention.Wherein:
Fig. 1 is the schematic diagram of real goal echo acquirement data；
Fig. 2 is single pulse echo apart from upper distribution schematic diagram；
Fig. 3 is the schematic diagram of the target echo under antenna radiation pattern modulation；
Fig. 4 is the flow chart of one target echo analogy method of embodiment；
Fig. 5 is the schematic diagram of one pulse compression signal range distribution of embodiment；
Fig. 6 is one angular relationship schematic diagram of embodiment；
Fig. 7 (a) and Fig. 7 (b) is one antenna direction illustrated example of embodiment；
Fig. 8 is the schematic diagram for the target echo that embodiment one is simulated；
Fig. 9 is the structural block diagram of two target echo simulation system of embodiment.
Specific embodiment
The invention will be further described with embodiment with reference to the accompanying drawing.
Embodiment one
Compared with real goal echo, present day analog data are short of mainly in multiple range gate amplitude distributions and antenna direction In figure modulation, in order to solve the technical problem, the present embodiment provides the mesh of a kind of consideration antenna radiation pattern adjustment and range sidelobe Mark analogue echoes method.
Please refer to attached drawing 4, the target echo analogy method the following steps are included:
S101, according to transmission power, antenna gain, target reflection cross section and radar detection target electromagnetic wave propagate away from From calculating the center intensity of echo-signal.
Specifically, the calculation method of the center intensity of echo-signal are as follows:
Wherein, PrFor the power for receiving echo-signal；PtFor transmission power；GtFor antenna gain；σ is the reflection of target Sectional area；ArFor the aperture area of receiving antenna；R is distance of the target to radar.
S102 is modulated target echo center intensity in multiple range gates, obtains compressed mesh after pulse compression Mark echo-signal.
In order to solve the problems, such as that target distribution in range gate, modern radar almost all use pulse and compress system, this makes Obtain the form that is distributed as Sinc function of the echo data in range gate.It is compressed when using Linear FM pulse compression Signal output are as follows:
Wherein, B is signal bandwidth, and τ is pulse width, tdTime delay for echo relative to transmitting pulse time.When taking B= 10MHz, τ=100us, tdDistribution of=750us the echo in range gate is as shown in Figure 5.
The present embodiment analyzes multiple pulse echos in radar each scan period, when using Linear FM pulse compression, In Distributed data in multiple range gates solves the problems, such as target distribution in range gate.
S103 carries out secondary modulation to target echo center intensity by antenna radiation pattern, obtains modulated distance-side Position two-dimensional targets echo-signal.
When the inswept target of radar antenna, multiple transmitting pulse irradiations are had to target, radar receives echo impulse string Intensity will receive the modulation of antenna radiation pattern main lobe, when target echo is too strong, the intensity of echo impulse string also suffers from antenna The modulation of minor lobe, as shown in Figure 3.
In the present embodiment, indicate antenna to the modulation feelings of echo impulse string intensity using modified sinc () function Condition.Radar antenna beam angle θ3dBIt indicates, the 1st sidelobe level G1(unit: dB) indicates, the 2nd sidelobe level G2It is (single Position: dB) it indicates, the n-th sidelobe level Gn(unit: dB) indicates, orientation where moment target when target is crossed in antenna scanning Angle is θ, as shown in Figure 6.Angular unit is radian (rad).According to the property of function sinc (), meet the day of above-mentioned condition Line directional diagram can indicate are as follows:
Wherein, G (θ) is piecewise function, and each sidelobe level of antenna radiation pattern, table are indicated using piecewise function G (θ) Up to formula such as following formula:
If taking θ3dB=2 °, G1=-35dB, G2=-45dB, then, shown in radar directional pattern such as Fig. 7 (a) and 7 (b).
The present embodiment is modulated in view of multiple echo impulse strings inside the single scan period by antenna radiation pattern The problem of, indicate that antenna to the modulation case of echo impulse string intensity, overcomes target and returns using modified sinc () function The intensity of echo impulse string also suffers from the deficiency of the modulation of antenna side lobe when wave is too strong.
Modulated range-azimuth two-dimensional targets echo-signal can be given by:
Wherein, s0It (t) is voltage distribution functions of the target echo in multiple range gates；F (θ) is antenna radiation pattern letter Number.
The example of the target echo signal obtained according to formula (4) is as shown in Figure 8, it can be seen that the true echo with Fig. 1 It is closely similar.
The target echo simulation system that the present embodiment proposes considers that strong target may above cover multiple distances in distance Door, it is also considered that multiple echo impulse strings inside to the single scan period are modulated by antenna radiation pattern, and analysis radar is every Multiple pulse echos in a scan period generate target echo analogue data under multiple range gates and antenna radiation pattern modulation.
Embodiment two
Compared with real goal echo, present day analog data are short of mainly in multiple range gate amplitude distributions and antenna direction In figure modulation, in order to solve the technical problem, the present embodiment provides the mesh of a kind of consideration antenna radiation pattern adjustment and range sidelobe Mark analogue echoes system.
Attached drawing 9 is please referred to, the target echo simulation system includes:
Center intensity computing module 201, for being visited according to transmission power, antenna gain, target reflection cross section and radar Target electromagnetic wave propagation distance is surveyed, the center intensity of echo-signal is calculated；
Modulation module 202 is compressed, after pulse compression, target echo center intensity is adjusted in multiple range gates System, obtains compressed target echo signal；
Antenna radiation pattern modulation module 203, for being adjusted the distance by antenna radiation pattern, the echo strength modulated and generated is carried out Secondary modulation obtains modulated range-azimuth two-dimensional targets echo-signal.
In the present embodiment, the compression modulation module has and is used for:
When using Linear FM pulse compression, distribution of the compressed target echo in multiple range gates are as follows:
Wherein, B is signal bandwidth, and τ is pulse width, tdTime delay for echo relative to transmitting pulse time.
In the present embodiment, the antenna radiation pattern modulation module is specifically used for:
Indicate antenna to the modulation case of echo impulse string intensity using modified sinc function.According to function sinc's Property, building meet the antenna radiation pattern of the following conditions, are as follows:
Radar antenna beam angle θ3dBIt indicates, the 1st sidelobe level G1(unit: dB) indicates, the 2nd sidelobe level G2 (unit: dB) indicates, the n-th sidelobe level Gn(unit: dB) indicates, orientation where moment target when target is crossed in antenna scanning Angle be θ.
Each sidelobe level of antenna radiation pattern is indicated using piecewise function G (θ), the expression is as follows:
Modulated range-azimuth two-dimensional targets echo-signal can be given by:
Wherein, s0It (t) is distributed data of the target echo in multiple range gates；F (θ) is the data of antenna radiation pattern.
Embodiment three
A kind of computer readable storage medium is present embodiments provided, computer program is stored thereon with, which is located Reason device realizes the step in target echo analogy method as shown in Figure 4 when executing.
Example IV
Present embodiments provide a kind of computer equipment, including memory, processor and storage are on a memory and can be The computer program run on processor, the processor realize target echo simulation as shown in Figure 4 when executing described program Step in method.
It should be understood by those skilled in the art that, embodiment of the disclosure can provide as method, system or computer program Product.Therefore, the shape of hardware embodiment, software implementation or embodiment combining software and hardware aspects can be used in the disclosure Formula.Moreover, the disclosure, which can be used, can use storage in the computer that one or more wherein includes computer usable program code The form for the computer program product implemented on medium (including but not limited to magnetic disk storage and optical memory etc.).
The disclosure be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates, Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one The step of function of being specified in a box or multiple boxes.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with Relevant hardware is instructed to complete by computer program, the program can be stored in a computer-readable storage medium In, the program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random AccessMemory, RAM) etc..
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the disclosure The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not Need to make the creative labor the various modifications or changes that can be made still within the protection scope of the disclosure.

Claims (9)

1. a kind of target echo analogy method, which comprises the following steps:
According to transmission power, antenna gain, target reflection cross section and radar detection target electromagnetic wave propagation distance, echo is calculated The center intensity of signal；
After pulse compression, distance modulated is carried out to target echo center intensity in multiple range gates, compressed target is obtained and returns Wave signal；
By antenna radiation pattern adjust the distance modulation generate target echo signal intensity carry out secondary modulation, obtain it is modulated away from From-orientation two-dimensional targets echo-signal.
2. target echo analogy method according to claim 1, which is characterized in that described to be returned in multiple range gates to target The method of wave center intensity progress distance modulated are as follows:
Using chirp-pulse compression radar, the compressed target echo signal of output are as follows:
Wherein, B is signal bandwidth, and τ is pulse width, tdTime delay for echo center relative to transmitting pulse time.
3. target echo analogy method according to claim 1, which is characterized in that described to be adjusted the distance by antenna radiation pattern The method that the target echo signal intensity that modulation generates carries out secondary modulation are as follows:
The modulation in orientation is carried out to target echo signal intensity using modified Sinc function.
4. target echo analogy method according to claim 1, which is characterized in that the antenna radiation pattern are as follows:
Wherein, θ3dBFor radar antenna beam angle；Sinc () is Sinc function；θ is moment target when target is crossed in antenna scanning Place azimuth；G (θ) is piecewise function, indicates each sidelobe level of antenna radiation pattern.
5. target echo analogy method according to claim 4, which is characterized in that the expression formula of the piecewise function G (θ) Are as follows:
Wherein, θ3dBFor radar antenna beam angle；θ is the angle in orientation where moment target when target is crossed in antenna scanning；N For the quantity of sidelobe level；GiFor the i-th sidelobe level, i=1,2 ..., N.
6. target echo analogy method according to claim 1, which is characterized in that the range-azimuth two-dimensional targets are returned The expression formula of wave signal are as follows:
Wherein, s0It (t) is distributed data of the target echo in multiple range gates；F (θ) is the data of antenna radiation pattern.
7. a kind of target echo simulation system characterized by comprising
Center intensity computing module, for according to transmission power, antenna gain, target reflection cross section and radar detection target electricity Electromagnetic wave propagation distance calculates the center intensity of echo-signal；
Modulation module is compressed, after pulse compression, distance modulated is carried out to target echo center intensity in multiple range gates, is obtained To compressed target echo signal；
Antenna radiation pattern modulation module, for being adjusted the distance by antenna radiation pattern, the target echo signal intensity modulated and generated is carried out Secondary modulation obtains modulated range-azimuth two-dimensional targets echo-signal.
8. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is held by processor It realizes when row such as the step in target echo analogy method of any of claims 1-6.
9. a kind of terminal device including memory, processor and stores the calculating that can be run on a memory and on a processor Machine program, which is characterized in that the processor realizes such as target of any of claims 1-6 when executing described program Step in analogue echoes method.
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