CN103675777B - Based on airborne radar clutter analogy method and the device of fitting process - Google Patents

Based on airborne radar clutter analogy method and the device of fitting process Download PDF

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CN103675777B
CN103675777B CN201310690440.XA CN201310690440A CN103675777B CN 103675777 B CN103675777 B CN 103675777B CN 201310690440 A CN201310690440 A CN 201310690440A CN 103675777 B CN103675777 B CN 103675777B
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doppler
clutter
distance
radar
dimensional spectrum
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CN103675777A (en
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丁晟
陆彬
陆健鲲
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WUXI LEIHUA TECHNOLOGY Co Ltd
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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)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The invention discloses a kind of airborne radar clutter analogy method based on fitting process and device, belong to simulation field of radar system, first the method obtains airborne radar parameter, and only needs the range gate H(0 obtaining altitudeline clutter, R h), Doppler's door of main-lobe clutter and range gate M(D m, R m), terminating point coordinate Z(D mAX, R mAX), thus significantly decrease calculated amount; Then by matching, thus form clutter envelope, eventually pass further modulation, thus simulation noise signal, make this airborne radar clutter analogy method based on fitting process can requirement of real time and through engineering approaches application.

Description

Based on airborne radar clutter analogy method and the device of fitting process
Technical field
The present invention relates to simulation field of radar system, particularly relate to a kind of airborne radar clutter analogy method based on fitting process and device.
Background technology
Well-known, radar is widely used in military and civilian equipment, and the detection of radar performance also has very important directive significance for the application of radar.For common roadbed, the radar such as vehicle-mounted and carrier-borne, by the test of outfield to calibration part, just substantially can solve the qualification to radar performance.But for airborne radar, its environment truly applied is the high-altitude of thousands of meters, accomplishing that test is demarcated in outfield, must realize by taking a flight test.The cost of once taking a flight test, cycle, resource are often very huge, so it is unpractical that the method for taking a flight test of placing one's entire reliance upon realizes the detection of airborne radar performance.
At present, industry generally adopts radar simulator to substitute environment of taking a flight test really, radar simulator is by the simulation to target electromagnetic reflection characteristic, the rf excitation signal of a coherent is poured into radar, this pumping signal contains the Distance geometry velocity information of target, then by detecting radar to the resolving ability of this pumping signal, deducing the processing power of radar to actual ghosts, drawing the overall performance index of radar thus.The importance of the method is exactly how real guinea pig echo, in the actual environment, radar return generally includes: target echo, undesired signal, noise and clutter etc., and wherein, target echo realizes by range delay and Doppler's multiplication; Undesired signal realizes by interference simulator; Noise realizes by noise generator; Clutter is then realized by clutter generator.
Wherein, clutter generator realizes the most complicated, simultaneously also important.Airborne radar clutter generally includes meteorological clutter, land clutter and sea clutter etc., and this few class clutter is owing to causing for radar emission wave reflection in meteorological target, ground and sea.These clutters often enter into the receiving cable of radar together with target echo, thus cause interference to radar solving target information.
In prior art, generally realize airborne radar clutter by distribution function method and stress and strain model method, distribution function method is a certain function meeting the clutter regularity of distribution of summing up out according to test flight data, carrys out backstepping clutter data; Stress and strain model method is by carrying out stress and strain model to ground, sea and meteorological target etc., the foundation divided is distance by radar resolution and DOPPLER RESOLUTION, then each grid after division is carried out target echo calculating according to point target, last again by echoed signal synthesis, obtain overall noise signal.
Distribution function method is adopted to generate noise signal, simply, fast and calculated amount is few, but the clutter obtained often has larger different from true noise signal, and for airborne radar, this method cannot realize the simulation of secondary lobe clutter and altitudeline clutter; And adopt stress and strain model method to generate noise signal, although noise signal very true to nature can be simulated, main-lobe clutter, secondary lobe clutter and altitudeline clutter can be realized, adopt stress and strain model method calculated amount very huge, cannot realize calculating in real time and through engineering approaches application.
Summary of the invention
For above-mentioned Problems existing, the invention provides a kind of airborne radar clutter analogy method based on fitting process and device, the problem that cannot better realize is simulated to overcome airborne radar clutter in prior art, thus both ensured that calculated amount was applicable to, simulation noise signal that again can be true to nature, so requirement of real time and through engineering approaches application.
To achieve these goals, the technical scheme that the present invention takes is:
Based on an airborne radar clutter analogy method for fitting process, wherein, comprising:
(1) obtain airborne parameter, described airborne parameter comprises the range gate H(0 of altitudeline clutter, R h), Doppler's door of main-lobe clutter and range gate M(D m, R m), terminating point coordinate Z(D mAX, R mAX),
Wherein, D m=2vcos (θ)/λ, R m=R h/ sin (θ), R hfor the flying height of carrier aircraft, θ is that antenna main beam points to the angle with ground, and v is carrier aircraft speed, and λ is radar transmitting wave wavelength, D mAXfor radar maximum Doppler scope, R mAXfor maximum radar range;
(2), in the matched curve determined to described model of fit by coordinate fitting corresponding for described airborne parameter according to the model of fit preset, initial Doppler-distance two-dimensional spectrum is obtained;
(3) according to reference signal, described initial Doppler-distance two-dimensional spectrum is modulated, obtain the noise signal of described airborne radar.
The above-mentioned airborne radar clutter analogy method based on fitting process, wherein, described model of fit is calculated by linear fit and forms, and described linear fit is:
R = R M - R H D M &CenterDot; D + R H D &le; D M R MAX - R M D MAX - D M &CenterDot; D + R M - R MAX - R M D MAX - D M &CenterDot; D M D M < D &le; D MAX .
The above-mentioned airborne radar clutter analogy method based on fitting process, wherein, described reference signal is a power fitting coefficient, and the defining method of described power fitting coefficient is:
First, setting height line clutter power is P h, main-lobe clutter power is P m, terminating point clutter power is P mAX.All the other each point power are all set to steady state value P 0, and meet between each performance number: P mAX< P 0< P h< P m;
Then by each point performance number P of gained h, P m, P mAX, P 0, along Doppler dimension direction by a smoothing operation of average filter, obtain described power fitting coefficient.
The above-mentioned airborne radar clutter analogy method based on fitting process, wherein, according to reference signal, modulation is carried out to described initial Doppler-distance two-dimensional spectrum and comprise the following steps:
(1) described initial Doppler-distance two-dimensional spectrum is modulated along reference signal described in Doppler Wesy, obtain the first Doppler-distance two-dimensional spectrum;
(2) described first Doppler-distance two-dimensional spectrum is carried out IFFT conversion, and modulates by random number, obtain the noise signal of described airborne radar.
The above-mentioned airborne radar clutter analogy method based on fitting process, wherein, according to reference signal, modulation is carried out to described initial Doppler-distance two-dimensional spectrum and comprise the following steps:
(1) described initial Doppler-distance two-dimensional spectrum is modulated along reference signal described in Doppler Wesy, obtain the first Doppler-distance two-dimensional spectrum;
(2) described first Doppler-distance two-dimensional spectrum is folded according to the PRF of actual radar, obtain ambiguous Doppler-distance two-dimensional spectrum;
(3) described ambiguous Doppler-distance two-dimensional spectrum is carried out IFFT conversion, and modulates by random number, to obtain the noise signal of described airborne radar.
The above-mentioned airborne radar clutter analogy method based on fitting process, wherein, described random number meets Gaussian distribution.
Based on an airborne radar clutter analogue means for fitting process, wherein, comprising:
(1) acquisition module, described acquisition module obtains airborne parameter, and described airborne parameter comprises the range gate H(0 of altitudeline clutter, R h), Doppler's door of main-lobe clutter and range gate M(D m, R m), terminating point coordinate Z(D mAX, R mAX),
Wherein, D m=2vcos (θ)/λ, R m=R h/ sin (θ), R hfor the flying height of carrier aircraft, θ is that antenna main beam points to the angle with ground, and v is carrier aircraft speed, and λ is radar transmitting wave wavelength, D mAXfor radar maximum Doppler scope, R mAXfor maximum radar range;
(2) fitting module, in the matched curve that coordinate fitting corresponding for described airborne parameter is determined to described model of fit according to the model of fit preset by described fitting module, obtains initial Doppler-distance two-dimensional spectrum;
(3) modulation module, described modulation module is modulated described initial Doppler-distance two-dimensional spectrum according to reference signal, obtains the noise signal of described airborne radar.
The above-mentioned airborne radar clutter analogue means based on fitting process, wherein, model of fit built-in in described fitting module is calculated by linear fit and forms, and described linear fit is:
R = R M - R H D M &CenterDot; D + R H D &le; D M R MAX - R M D MAX - D M &CenterDot; D + R M - R MAX - R M D MAX - D M &CenterDot; D M D M < D &le; D MAX .
The above-mentioned airborne radar clutter analogue means based on fitting process, wherein, the reference signal that described modulation module modulates time institute's foundation is a power fitting coefficient, and the defining method of described power fitting coefficient is:
First, setting height line clutter power is P h, main-lobe clutter power is P m, terminating point clutter power is P mAX.All the other each point power are all set to steady state value P 0, and meet between each performance number: P mAX< P 0< P h< P m;
Then by each point performance number P of gained h, P m, P mAX, P 0, along Doppler dimension direction by a smoothing operation of average filter, obtain described power fitting coefficient.
The above-mentioned airborne radar clutter analogue means based on fitting process, wherein, described modulation module carries out modulation according to reference signal to described initial Doppler-distance two-dimensional spectrum and comprises:
(1) described initial Doppler-distance two-dimensional spectrum is modulated along reference signal described in Doppler Wesy, obtain the first Doppler-distance two-dimensional spectrum;
(2) described first Doppler-distance two-dimensional spectrum is folded according to the PRF of actual radar, obtain ambiguous Doppler-distance two-dimensional spectrum;
(3) described ambiguous Doppler-distance two-dimensional spectrum is carried out IFFT conversion, and modulates by random number, to obtain the noise signal of described airborne radar.
Technique scheme tool has the following advantages or beneficial effect:
Airborne radar clutter analogy method based on fitting process provided by the invention, first obtains airborne radar parameter, and only needs the range gate H(0 obtaining altitudeline clutter, R h), Doppler's door of main-lobe clutter and range gate M(D m, R m), terminating point coordinate Z(D mAX, R mAX), thus significantly decrease calculated amount; Then by matching, thus form clutter envelope, eventually pass further modulation, thus simulation noise signal, make this airborne radar clutter analogy method based on fitting process can requirement of real time and through engineering approaches application.
In addition, further, model of fit is calculated by linear fit to form, thus the clutter envelope making matching be formed more meets the clutter of reality, and through reference signal modulation, IFFT conversion, thus make the noise signal that simulates more true, and then make the high airborne radar clutter analogy method based on fitting process can requirement of real time and through engineering approaches application.
Airborne radar clutter analogue means based on fitting process provided by the invention, comprise acquisition module, fitting module and modulation module, through carrying out matching by fitting module after fitting module obtains airborne parameter, then modulated by modulation module, just the noise signal close to reality can be obtained, thus make the noise signal that simulates more true, and intermediate computations amount is less, and then makes this airborne radar clutter analogue means based on fitting process can requirement of real time and through engineering approaches application.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, the present invention and feature, profile and advantage will become more apparent.Mark identical in whole accompanying drawing indicates identical part.Deliberately proportionally do not draw accompanying drawing, focus on purport of the present invention is shown.
Fig. 1 is the flowage structure schematic diagram of the airborne radar clutter analogy method based on fitting process that the embodiment of the present invention 1 provides;
Fig. 2 is the schematic diagram of initial Doppler-distance two-dimensional spectrum that the embodiment of the present invention 1 provides;
Fig. 3 is the schematic diagram of ambiguous Doppler-distance two-dimensional spectrum that the embodiment of the present invention 1 provides;
Fig. 4 is the structural representation of the airborne radar clutter analogue means based on fitting process that the embodiment of the present invention 1 provides.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is further illustrated, but not as limiting to the invention.
Embodiment 1:
Fig. 1 is the flowage structure schematic diagram of the airborne radar clutter analogy method based on fitting process that the embodiment of the present invention 1 provides; Fig. 2 is the schematic diagram of initial Doppler-distance two-dimensional spectrum that the embodiment of the present invention 1 provides; Fig. 3 is the schematic diagram of ambiguous Doppler-distance two-dimensional spectrum that the embodiment of the present invention 1 provides; As shown in the figure, the airborne radar clutter analogy method based on fitting process that the embodiment of the present invention 1 provides, comprising: (1) obtains airborne parameter, this airborne parameter comprises the range gate H(0 of altitudeline clutter, R h), Doppler's door of main-lobe clutter and range gate M(D m, R m), terminating point coordinate Z(D mAX, R mAX), wherein, D m=2vcos (θ)/λ, R m=R h/ sin (θ), R hfor the flying height of carrier aircraft, θ is that antenna main beam points to the angle with ground, and v is carrier aircraft speed, and λ is radar transmitting wave wavelength, D mAXfor radar maximum Doppler scope, R mAXfor maximum radar range.
(2), in the matched curve determined to model of fit by coordinate fitting corresponding for airborne parameter according to the model of fit preset, initial Doppler-distance two-dimensional spectrum is obtained; This model of fit is calculated by linear fit and forms, and described linear fit is:
R = R M - R H D M &CenterDot; D + R H D &le; D M R MAX - R M D MAX - D M &CenterDot; D + R M - R MAX - R M D MAX - D M &CenterDot; D M D M < D &le; D MAX .
In addition, this model of fit also can adopt other approximating methods to calculate, as smooth curve method, the non linear fit method and one-dimensional filtering method.
(3) according to reference signal, initial Doppler-distance two-dimensional spectrum is modulated, obtain the noise signal of airborne radar; This reference signal is a power fitting coefficient, and the defining method of power fitting coefficient is:
First, setting height line clutter power is P h, main-lobe clutter power is P m, terminating point clutter power is P mAX.All the other each point power are all set to steady state value P 0, and meet between each performance number: P mAX< P 0< P h< P m;
Then by each point performance number P of gained h, P m, P mAX, P 0, along Doppler dimension direction by a smoothing operation of average filter, obtain power fitting coefficient.
Meanwhile, according to reference signal, modulation is carried out to initial Doppler-distance two-dimensional spectrum and comprises following methods:
Method one:
(1) initial Doppler-distance two-dimensional spectrum is modulated along Doppler Wesy reference signal, obtain the first Doppler-distance two-dimensional spectrum;
(2) the first Doppler-distance two-dimensional spectrum is carried out IFFT conversion, and modulates by random number, obtain the noise signal of airborne radar.
Method two:
(1) initial Doppler-distance two-dimensional spectrum is modulated along Doppler Wesy reference signal, obtain the first Doppler-distance two-dimensional spectrum;
(2) the first Doppler-distance two-dimensional spectrum is folded according to the PRF of actual radar, obtain ambiguous Doppler-distance two-dimensional spectrum;
(3) ambiguous Doppler-distance two-dimensional spectrum is carried out IFFT conversion, and modulates by random number, to obtain the noise signal of airborne radar.
In method one and method two, random number will meet Gaussian distribution.
So the airborne radar clutter analogy method based on fitting process that the embodiment of the present invention 1 provides, first obtains airborne radar parameter, and only need the range gate H(0 obtaining altitudeline clutter, R h), Doppler's door of main-lobe clutter and range gate M(D m, R m), terminating point coordinate Z(D mAX, R mAX), thus significantly decrease calculated amount; Then by matching, thus form clutter envelope, eventually pass further modulation, thus simulation noise signal, make this airborne radar clutter analogy method based on fitting process can requirement of real time and through engineering approaches application.
In addition, further, model of fit is calculated by linear fit to form, thus the clutter envelope making matching be formed more meets the clutter of reality, and through reference signal modulation, IFFT conversion, thus make the noise signal that simulates more true, and then make the high airborne radar clutter analogy method based on fitting process can requirement of real time and through engineering approaches application.
Fig. 4 is the structural representation of the airborne radar clutter analogue means based on fitting process that the embodiment of the present invention 1 provides; As shown in the figure, the airborne radar clutter analogue means based on fitting process that the embodiment of the present invention 1 provides, comprising: (1) acquisition module, acquisition module obtains airborne parameter, and this airborne parameter comprises the range gate H(0 of altitudeline clutter, R h), Doppler's door of main-lobe clutter and range gate M(D m, R m), terminating point coordinate Z(D mAX, R mAX), wherein, D m=2vcos (θ)/λ, R m=R h/ sin (θ), R hfor the flying height of carrier aircraft, θ is that antenna main beam points to the angle with ground, and v is carrier aircraft speed, and λ is radar transmitting wave wavelength, D mAXfor radar maximum Doppler scope, R mAXfor maximum radar range;
(2) fitting module, in the matched curve that coordinate fitting corresponding for airborne parameter is determined to model of fit according to the model of fit preset by fitting module, thus obtains initial Doppler-distance two-dimensional spectrum; Model of fit built-in in this fitting module is calculated by linear fit and forms, and linear fit is:
R = R M - R H D M &CenterDot; D + R H D &le; D M R MAX - R M D MAX - D M &CenterDot; D + R M - R MAX - R M D MAX - D M &CenterDot; D M D M < D &le; D MAX .
(3) modulation module, modulation module is modulated initial Doppler-distance two-dimensional spectrum according to reference signal, obtains the noise signal of airborne radar; The reference signal that this modulation module modulates time institute's foundation is a power fitting coefficient, and the defining method of power fitting coefficient is:
First, setting height line clutter power is P h, main-lobe clutter power is P m, terminating point clutter power is P mAX.All the other each point power are all set to steady state value P 0, and meet between each performance number: P mAX< P 0< P h< P m;
Then by each point performance number P of gained h, P m, P mAX, P 0, along Doppler dimension direction by a smoothing operation of average filter, obtain described power fitting coefficient.
Meanwhile, this modulation module carries out modulation according to reference signal to initial Doppler-distance two-dimensional spectrum and comprises:
(1) initial Doppler-distance two-dimensional spectrum is modulated along Doppler Wesy reference signal, obtain the first Doppler-distance two-dimensional spectrum;
(2) the first Doppler-distance two-dimensional spectrum is folded according to the PRF of actual radar, obtain ambiguous Doppler-distance two-dimensional spectrum;
(3) ambiguous Doppler-distance two-dimensional spectrum is carried out IFFT conversion, and modulates by random number, to obtain the noise signal of airborne radar, and this random number will meet Gaussian distribution.
So, the airborne radar clutter analogue means based on fitting process that the embodiment of the present invention 1 provides, comprise acquisition module, fitting module and modulation module, through carrying out matching by fitting module after fitting module obtains airborne parameter, then modulated by modulation module, just the noise signal close to reality can be obtained, thus make the noise signal that simulates more true, and intermediate computations amount is less, so make this airborne radar clutter analogue means based on fitting process can requirement of real time and through engineering approaches application.
In sum, the airborne radar clutter analogy method based on fitting process provided by the invention, first obtains airborne radar parameter, and only needs the range gate H(0 obtaining altitudeline clutter, R h), Doppler's door of main-lobe clutter and range gate M(D m, R m), terminating point coordinate Z(D mAX, R mAX), thus significantly decrease calculated amount; Then by matching, thus form clutter envelope, eventually pass further modulation, thus simulation noise signal, make this airborne radar clutter analogy method based on fitting process can requirement of real time and through engineering approaches application.
In addition, further, model of fit is calculated by linear fit to form, thus the clutter envelope making matching be formed more meets the clutter of reality, and through reference signal modulation, IFFT conversion, thus make the noise signal that simulates more true, and then make the high airborne radar clutter analogy method based on fitting process can requirement of real time and through engineering approaches application.
Airborne radar clutter analogue means based on fitting process provided by the invention, comprise acquisition module, fitting module and modulation module, through carrying out matching by fitting module after fitting module obtains airborne parameter, then modulated by modulation module, just the noise signal close to reality can be obtained, thus make the noise signal that simulates more true, and intermediate computations amount is less, and then makes this airborne radar clutter analogue means based on fitting process can requirement of real time and through engineering approaches application.
It should be appreciated by those skilled in the art that those skilled in the art can realize described change case in conjunction with prior art and above-described embodiment, do not repeat them here.Such change case does not affect flesh and blood of the present invention, does not repeat them here.
Above preferred embodiment of the present invention is described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, the equipment wherein do not described in detail to the greatest extent and structure are construed as to be implemented with the common mode in this area; Any those of ordinary skill in the art, make many possible variations and modification not departing from technical solution of the present invention, or be revised as the Equivalent embodiments of equivalent variations, this does not affect flesh and blood of the present invention.Therefore, every content not departing from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent variations and modification, all still belongs in the scope of technical solution of the present invention protection.

Claims (8)

1., based on an airborne radar clutter analogy method for fitting process, it is characterized in that, comprising:
(1) airborne parameter is obtained, described airborne parameter comprises the range gate H (0 of altitudeline clutter, RH), Doppler's door of main-lobe clutter and range gate M (DM, RM), terminating point coordinate Z (DMAX, RMAX), wherein, DM=2vcos (θ)/λ, RM=RH/sin (θ), RH are the flying height of carrier aircraft, and θ is that antenna main beam points to the angle with ground, v is carrier aircraft speed, λ is radar transmitting wave wavelength, and DMAX is radar maximum Doppler scope, and RMAX is maximum radar range;
(2) according to the model of fit preset:
R = R M - R H D M &CenterDot; D + R H D &le; D M R M A X - R M D M A X - D M &CenterDot; D + R M - R M A X - R M D M A X - D H &CenterDot; D M D M < D &le; D M A X .
In the matched curve determined to described model of fit by coordinate fitting corresponding for described airborne parameter, obtain initial Doppler-distance two-dimensional spectrum;
(3) modulate described initial Doppler-distance two-dimensional spectrum according to reference signal, obtain the noise signal of described airborne radar, this reference signal is a power fitting coefficient, and the defining method of power fitting coefficient is:
First, setting height line clutter power is PH, main-lobe clutter power is PM, terminating point clutter power is PMAX, all the other each point power are all set to steady state value P0, and meet between each performance number: PMAX < P0 < PH < PM;
Then by each point performance number PH of gained, PM, PMAX, P0, along Doppler dimension direction by a smoothing operation of average filter, obtain power fitting coefficient.
2., as claimed in claim 1 based on the airborne radar clutter analogy method of fitting process, it is characterized in that, according to reference signal, modulation is carried out to described initial Doppler-distance two-dimensional spectrum and comprise the following steps:
(1) described initial Doppler-distance two-dimensional spectrum is modulated along reference signal described in Doppler Wesy, obtain the first Doppler-distance two-dimensional spectrum;
(2) described first Doppler-distance two-dimensional spectrum is carried out IFFT conversion, and modulates by random number, obtain the noise signal of described airborne radar.
3., as claimed in claim 1 based on the airborne radar clutter analogy method of fitting process, it is characterized in that, according to reference signal, modulation is carried out to described initial Doppler-distance two-dimensional spectrum and comprise the following steps:
(1) described initial Doppler-distance two-dimensional spectrum is modulated along reference signal described in Doppler Wesy, obtain the first Doppler-distance two-dimensional spectrum;
(2) described first Doppler-distance two-dimensional spectrum is folded according to the PRF of actual radar, obtain ambiguous Doppler-distance two-dimensional spectrum;
(3) described ambiguous Doppler-distance two-dimensional spectrum is carried out IFFT conversion, and modulates by random number, to obtain the noise signal of described airborne radar.
4., as claimed in claim 2 or claim 3 based on the airborne radar clutter analogy method of fitting process, it is characterized in that, described random number meets Gaussian distribution.
5., based on an airborne radar clutter analogue means for fitting process, it is characterized in that, comprising:
(1) acquisition module, described acquisition module obtains airborne parameter, described airborne parameter comprises the range gate H (0 of altitudeline clutter, RH), Doppler's door of main-lobe clutter and range gate M (DM, RM), terminating point coordinate Z (DMAX, RMAX), wherein, DM=2vcos (θ)/λ, RM=RH/sin (θ), RH is the flying height of carrier aircraft, θ is that antenna main beam points to the angle with ground, and v is carrier aircraft speed, and λ is radar transmitting wave wavelength, DMAX is radar maximum Doppler scope, and RMAX is maximum radar range;
(2) fitting module, in the matched curve that coordinate fitting corresponding for described airborne parameter is determined to described model of fit according to the model of fit preset by described fitting module, obtains initial Doppler-distance two-dimensional spectrum;
(3) modulation module, described modulation module is modulated described initial Doppler-distance two-dimensional spectrum according to reference signal, obtains the noise signal of described airborne radar.
6. as claimed in claim 5 based on the airborne radar clutter analogue means of fitting process, it is characterized in that, model of fit built-in in described fitting module is calculated by linear fit and forms, and described linear fit is:
R = R M - R H D M &CenterDot; D + R H D &le; D M R M A X - R M D M A X - D M &CenterDot; D + R M - R M A X - R M D M A X - D H &CenterDot; D M D M < D &le; D M A X .
7., as claimed in claim 5 based on the airborne radar clutter analogue means of fitting process, it is characterized in that, the reference signal that described modulation module modulates time institute's foundation is a power fitting coefficient, and the defining method of described power fitting coefficient is:
First, setting height line clutter power is PH, main-lobe clutter power is PM, terminating point clutter power is PMAX, all the other each point power are all set to steady state value P0, and meet between each performance number: PMAX < P0 < PH < PM;
Then by each point performance number PH of gained, PM, PMAX, P0, along Doppler dimension direction by a smoothing operation of average filter, obtain described power fitting coefficient.
8., as claimed in claim 5 based on the airborne radar clutter analogue means of fitting process, it is characterized in that, described modulation module carries out modulation according to reference signal to described initial Doppler-distance two-dimensional spectrum and comprises:
(1) described initial Doppler-distance two-dimensional spectrum is modulated along reference signal described in Doppler Wesy, obtain the first Doppler-distance two-dimensional spectrum;
(2) described first Doppler-distance two-dimensional spectrum is folded according to the PRF of actual radar, obtain ambiguous Doppler-distance two-dimensional spectrum;
(3) described ambiguous Doppler-distance two-dimensional spectrum is carried out IFFT conversion, and modulates by random number, to obtain the noise signal of described airborne radar.
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