CN112558055B - Target positioning method, target positioning device, GMTI system and readable storage medium - Google Patents

Target positioning method, target positioning device, GMTI system and readable storage medium Download PDF

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CN112558055B
CN112558055B CN202011267877.9A CN202011267877A CN112558055B CN 112558055 B CN112558055 B CN 112558055B CN 202011267877 A CN202011267877 A CN 202011267877A CN 112558055 B CN112558055 B CN 112558055B
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target
phase
determining
doppler
sharpening
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CN112558055A (en
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胡瑞贤
张昭
王永达
贾秀权
刘承平
冯莉
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China Academy of Electronic and Information Technology of CETC
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China Academy of Electronic and Information Technology of CETC
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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
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06—Systems determining position data of a target
    • 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
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
    • G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
    • G01S13/9021—SAR image post-processing techniques
    • 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
    • G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
    • G01S7/414—Discriminating targets with respect to background clutter
    • 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
    • G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
    • G01S7/415—Identification of targets based on measurements of movement associated with the target

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  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The invention discloses a target positioning method, a target positioning device, a GMTI system and a readable storage medium, wherein the method comprises the following steps: determining target interference phases of different Doppler channels by suppressing the sharpening ratio; determining a target azimuth according to the target interference phase; and completing positioning based on the target azimuth. The method determines the target interference phases of different Doppler channels through the defined sharpening suppression ratio, so that the target positioning according to the target interference phases can be realized, and the target positioning precision is improved.

Description

Target positioning method, target positioning device, GMTI system and readable storage medium
Technical Field
The present invention relates to the field of radar technologies, and in particular, to a target positioning method, a target positioning device, a GMTI system, and a readable storage medium.
Background
Two important functions of the wide area GMTI system, also known as the scanning moving object detection (SCAN ground moving target indication, SCAN-GMTI) system, are doppler beam sharpening (Doppler beam sharpening, DBS) imaging and object detection positioning. The position of a moving object on a DBS image or a synthetic aperture radar (synthetic aperture radar, SAR) image tends to deviate from its true position due to the influence of the radial velocity. In order to avoid misjudgment of information, the true azimuth angle of the moving object is required to be solved after the moving object is detected, and the moving object is repositioned.
DBS is used as a non-focused imaging technique, and uses Doppler spread caused by platform motion to distinguish echoes in different directions, so as to achieve finer azimuth resolution than a real beam. Because the fixed ground object echo Doppler has a corresponding relation with the visual angle, the radar time domain echo is processed by fast Fourier transform (Fourier transform, FFT), the ground clutter corresponding to each Doppler output is limited in a small angular domain range, and the clutter angular domains corresponding to the Doppler output are different, so that the ground fixed clutter 'airspace localization' is realized. While the moving target in the original beam coverage area is output in the Doppler channel corresponding to the moving target, the angular area corresponding to clutter is different in the channel due to the influence of the radial speed.
In the prior art, a plurality of target positioning methods exist, but the problem of target positioning under the error background is rarely related. For example, in the channel phase error estimation method based on multi-wave-level clutter, only specific errors are compensated, so that the implementation is complex, interaction exists between different errors, and the final target positioning performance is inevitably affected. The method comprehensively considers the influence of various non-ideal factors on measured data in the accurate positioning method of the scanning GMTI moving target, provides a clutter suppression sharpening ratio and equivalent baseline concept, and converts the target positioning problem into an equivalent baseline estimation problem, but the robustness of the method is reduced when the interference phase nonlinear condition is changed, and the baseline estimation accuracy can be influenced by a strong target in a side lobe area.
Disclosure of Invention
The embodiment of the invention provides a target positioning method, a device, a GMTI system and a readable storage medium, which are used for determining target interference phases of different Doppler channels through defined sharpening suppression ratios, so that target positioning according to the target interference phases can be realized, and the target positioning precision is improved.
In a first aspect, an embodiment of the present invention provides a target positioning method, including:
determining target interference phases of different Doppler channels by suppressing the sharpening ratio;
determining a target azimuth according to the target interference phase;
and completing positioning based on the target azimuth.
Optionally, before determining the target interference phases of the different doppler channels by suppressing the sharpening ratio, the method includes:
determining a corresponding sharpening suppression ratio according to the ratio of complex signals in the set range-Doppler unit before and after clutter suppression; the distance Doppler unit is obtained according to the main beam direction selection of the corresponding Doppler channel.
Optionally, determining the target interference phases of the different doppler channels by suppressing the sharpening ratio includes:
the direction of a differential beam zero point formed by the sub-apertures corresponding to the Doppler channels is adjusted so as to filter out ground clutter in the direction of the corresponding main beam;
and determining the optimal interference phase between the adjacent Doppler channels by using the suppression sharpening ratio based on the angular domain corresponding to the Doppler channels after the ground noise is filtered.
Optionally, determining the target interference phases of different doppler channels by suppressing the sharpening ratio further comprises:
constructing a phase equation set according to the optimal interference phases among a plurality of adjacent range-Doppler units in the main lobe;
solving the phase equation set, and determining a target interference phase and a corresponding phase parameter;
wherein the phase parameter comprises at least one of: actual wavelength, phase center-to-center spacing, and amplitude-to-phase error.
Optionally, determining the target interference phases of different doppler channels by suppressing the sharpening ratio further comprises:
performing conjugate multiplication on a received signal corresponding to the target interference phase;
based on the received signal after conjugate multiplication, the main lobe phase ambiguity is filtered out.
Optionally, determining the target azimuth according to the target interference phase includes:
and determining a target phase angle based on the phase parameter according to the received signal with the main lobe phase ambiguity filtered.
In a second aspect, an embodiment of the present invention provides a target positioning device, including:
the data processing unit is used for determining target interference phases of different Doppler channels by suppressing the sharpening ratio; the method comprises the steps of,
determining a target azimuth according to the target interference phase;
and the positioning unit is used for completing positioning based on the target azimuth angle.
In a third aspect, an embodiment of the present invention provides a scanning moving object detection system, including the foregoing object positioning device.
In a fourth aspect, embodiments of the present invention provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the aforementioned object localization method.
According to the embodiment of the invention, the target interference phases of different Doppler channels are determined through the defined sharpening suppression ratio, so that the target positioning according to the target interference phases can be realized, the target positioning precision is improved, and the positive technical effect is achieved.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a flow chart of a first embodiment of the present invention;
FIG. 2 is a graph showing the result of an optimal interferometric phase search in accordance with a second embodiment of the present invention;
fig. 3 is a result of parameter estimation by the least square method according to the second embodiment of the present invention.
Fig. 4 is a diagram showing the result of target positioning according to the second embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
A first embodiment of the present invention provides a target positioning method, as shown in FIG. 1, comprising the following specific steps:
s101, determining target interference phases of different Doppler channels by suppressing sharpening ratios;
s102, determining a target azimuth according to the target interference phase;
s103, positioning is completed based on the target azimuth.
The embodiment of the invention is used for realizing the accurate positioning of the targets with two apertures, and the target interference phases of different Doppler channels are mainly determined through the defined sharpening suppression ratio, so that the target positioning according to the target interference phases can be realized, and the target positioning precision is improved.
Optionally, before determining the target interference phases of the different doppler channels by suppressing the sharpening ratio, the method includes:
determining a corresponding sharpening suppression ratio according to the ratio of complex signals in the set range-Doppler unit before and after clutter suppression; the distance Doppler unit is obtained according to the main beam direction selection of the corresponding Doppler channel.
Specifically, in this embodiment, the correspondence between the ground object echo doppler and the view angle may be fixed, and the radar time domain echo may be subjected to Fast Fourier Transform (FFT), where the ground clutter corresponding to each path of doppler output is limited to a small angular range, and the clutter angular ranges corresponding to each path of doppler output are different. Thus realizing the space domain localization of ground fixed clutter. While the moving target in the original beam coverage area is output in the Doppler channel corresponding to the moving target, the Doppler f is different in the angular domain corresponding to clutter in the channel due to the influence of the radial velocity dt Is that
Wherein v is p For carrier speed, v r For target radial velocity, λ is wavelength, θ t The actual azimuth angle of the target is represented as the included angle between the connecting line of the target and the radar and the normal direction of the track,represents pitch angle, θ t ' is the equivalent target azimuth angle observed by the radar (i.e., the azimuth angle of the moving target in the DBS image).
Equivalent target azimuth angle theta 'observed by radar' t ＝θ main +θ t (-△θ/2≤θ′ t Less than or equal to delta theta/2), wherein theta main Is the azimuth angle at which the main beam is directed, Δθ is the beamwidth. Since the distance between the two sub-apertures is not zero, there is a wave path difference between the echo signal and the two apertures. Assume that the range-Doppler unit where the target is located is (r, f d ) The two sub-aperture receive signals are:
χ 1 (r,f d )＝χ (2)
wherein χ is 1 (r,f d ) And χ (x) 2 (r,f d ) Respectively representing the envelope of the received signals of the two sub-apertures, wherein the base line d is the phase center distance of the two apertures, χ is the target signal amplitude, λ is the signal wavelength,is pitch angle, theta t Representing the azimuth angle of the target relative to the main beam.
In practice, the baseline d and the wavelength λ may also have errors considering the adjacent doppler channel amplitude-phase errors, and equation (3) may be expressed as:
wherein,is the actual wavelength with error, < >>Representing the phase center-to-center spacing of two apertures in the presence of error, A 21 ＝A 2 /A 1 And phi 2_1 ＝φ 2_error -φ 1_error Respectively representing the amplitude and phase errors between the two channels.
Order thePsi represents the interferometric phase between the two channels as measured by the interferometer, and equation (3) can be reduced to
Wherein,
based on this embodiment, a clutter suppression sharpening ratio is defined to describe clutter suppression performance, satisfying:
wherein g before (r,f d ) For a single range-Doppler unit (r, f) prior to clutter suppression d ) Complex signal in g after (r,f d ) Is the complex signal of the range-doppler cell after clutter suppression. Equation (5) shows that the clutter suppression sharpening ratio is closely related to the clutter suppression performance, and the better the clutter suppression performance is, the smaller the square sum of the power after clutter suppression is, and the larger the value of the clutter suppression sharpening ratio is. Ideally, if clutter in a certain direction is completely suppressed, f sharp_ratio The value of (c) tends to infinity. In actual case, f sharp_ratio It is not possible to infinity and thus this ratio can be used to search for the optimal error equivalent baseline value. Therefore, in this embodiment, when the clutter suppression sharpening ratio reaches the maximum value, the corresponding baseline is the optimal error equivalent baseline satisfying the condition.
Optionally, determining the target interference phases of the different doppler channels by suppressing the sharpening ratio includes:
the direction of a differential beam zero point formed by the sub-apertures corresponding to the Doppler channels is adjusted so as to filter out ground clutter in the direction of the corresponding main beam;
and determining the optimal interference phase between the adjacent Doppler channels by using the suppression sharpening ratio based on the angular domain corresponding to the Doppler channels after the ground noise is filtered.
Specifically, in this embodiment, determining the target interference phases of different doppler channels by suppressing the sharpening ratio mainly includes the following steps:
according to the interferometer principle, after Doppler filtering is performed on signals of two beams, the same Doppler channel corresponds to the same narrow angular region in a fixed scene irradiated by the main beam, and the direction of a difference beam zero point formed by two sub-apertures is adjusted to coincide with the direction of the ground clutter corresponding to the Doppler channel, so that the ground clutter in the direction can be filtered. The direction of the zero point of the differential beam formed by the two sub-apertures can be specifically adjusted by means of the weight vector.
If the main beams of the two sub-apertures are directed at theta main Corresponding Doppler value f d_main Order-makingThe clutter suppression sharpening ratio can be expressed as
Wherein r is min And r max The start and end distance units, respectively. In practice, it is not enough to select only one range-doppler cell for estimation, and multiple independent co-distributed range samples in the main doppler channel should be selected for estimation to reduce noise effect.
Thus, the clutter suppression sharpening ratio can be used for searching the optimal interference phase between two Doppler channels
Optionally, determining the target interference phases of different doppler channels by suppressing the sharpening ratio further comprises:
constructing a phase equation set according to the optimal interference phases among a plurality of adjacent range-Doppler units in the main lobe;
solving the phase equation set, and determining a target interference phase and a corresponding phase parameter;
wherein the phase parameter comprises at least one of: actual wavelength, phase center-to-center spacing, and amplitude-to-phase error.
In this embodiment, M adjacent Doppler channels are used for estimationObtaining the optimal interference phaseAnd adopts the least square method to obtain +.>And->
Specifically, for M adjacent Doppler channels in the main lobe, M can be obtainedWill beAnd->M equations can be obtained as unknowns, satisfying:
writing the above equation into a matrix form can obtain the following overdetermined equation:
AX＝b (10)
wherein,(·) T indicating transpose,/->
Since the rank of matrix a is 2, i.e., rank (a) =2, the least squares solution of equation (10) is given by:
X＝(A T A) -1 A T b (11)
the target interference phase and the corresponding phase parameter can thus be determined.
Optionally, determining the target interference phases of different doppler channels by suppressing the sharpening ratio further comprises:
performing conjugate multiplication on a received signal corresponding to the target interference phase;
based on the received signal after conjugate multiplication, the main lobe phase ambiguity is filtered out.
Specifically, in this embodiment, the conjugate multiplication of the received signals of the two sub-apertures is performed to obtain:
wherein ( * Is conjugate, |·| * The representation takes absolute value. Since the baseline d between apertures is usually much larger than the wavelength λ, there is blurring of the phase of y in equation (12). Therefore, the main lobe phase ambiguity is further filtered in the embodiment, which comprises the following steps:
in the formula (11)Result substitution->And let y and->Multiplying and simplifying to obtain:
optionally, determining the target azimuth according to the target interference phase includes:
and determining a target phase angle based on the phase parameter according to the received signal with the main lobe phase ambiguity filtered.
Obtained by solving the aboveAnd->Substituting the target azimuth into the formula (13) to obtain a target azimuth and performing target positioning.
In particular, whenWhen the phase within the 3dB width of the main lobe is not blurred, θ can be obtained from the phase of y' in the formula (13) t 。
Wherein arg [. Cndot. ] represents the sampling phase.
Solving the azimuth angle of the target to realize the accurate positioning of the target:
the method fully considers the influence of non-ideal factors (such as carrier motion error, amplitude-phase error of a receiving channel, radar baseline error, doppler center estimation error, frequency hopping and the like) in a radar system on the positioning accuracy of a moving target, and introduces an interference phase maximum likelihood fitting method to estimate various errors, so that the complex multi-error background target positioning problem is converted into a single problem of solving an overdetermined equation least square solution.
The method firstly provides the clutter suppression sharpening ratio, adopts the clutter suppression sharpening ratio to estimate the optimal interference phase of each Doppler channel, then constructs an overdetermined equation and adopts a least square solution to solveAnd->Estimated +.>And->Substituting the target positioning algorithm, thereby realizing accurate positioning of the target.
In summary, the method of the invention has the following advantages:
1. the method solves the problem that the positioning accuracy of the traditional target positioning method is seriously reduced when the radar system parameters are inaccurate, and provides a new thought for solving the problem of accurate positioning of the wide area GMTI system target under the condition that the system parameters have errors;
2. the invention considers the mechanism that the radar system processes the recorded data through normal flight, the system error is necessarily reflected in the recorded data, the invention estimates the system parameter from the measured data, and the real error characteristic of the measured data can be better reflected as a whole;
3. the method converts the target positioning problem into the optimal interference phase estimation problem, thereby converting the complex target positioning problem with a multi-error background into a single problem for solving the least square solution of the overdetermined equation, and realizing accurate estimation of the channel error sum by estimating the optimal interference phase;
4. the method has good popularization and application values, and can be applied to the fields of slow moving target positioning of airborne SAR and spaceborne SAR images and the like.
Example two
In this embodiment, a set of X-band airborne multichannel wide area GMTI measured data is taken as an example to verify the performance of the present invention. The bandwidth of the radar signal is about 20MHz, the azimuth direction is 3 receiving antennas, and the average speed of the carrier is about 120m/s. The nominal d/lambda is 12.54, depending on the system parameters.
Firstly, searching the optimal interference phase by adopting a method for inhibiting the sharpening ratio, and giving out a target positioning result in a wave position range Doppler domain on the basis of the optimal interference phase and analyzing the target positioning result to verify the performance of the method. In addition, in practice, the final target needs to be marked on a map or a remote sensing mapping image (SAR image, satellite infrared image, DBS image, or the like) matched with the actual topography.
According to the interferometer principle, clutter in any direction acquired by two antennas can be suppressed by adjusting weights, and only clutter suppression on the beam center line is discussed in this embodiment, and other directions are similar. FIG. 2 shows the optimum interference phase found at the main beam direction by the method of the present inventionThe abscissa in FIG. 2 represents a set interferometric phase variation interval, which ranges from [ -pi, pi]The search interval is 0.00001rad, and the ordinate represents the clutter suppression sharpening ratios (shown logarithmically here for ease of analysis) for different interference phases. In FIG. 2, the clutter suppression sharpening ratio increases and then decreases gradually with the change of the baseline, and the clutter suppression sharpening ratio reaches a maximum value of 24.37dB when the interference phase value is-0.95632 rad. The clutter suppression sharpening ratio represents the clutter suppression capability of the system, and the baseline value corresponding to the maximum value is the optimal interference phase to be solved.
The clutter suppression is carried out according to the optimal interference phase obtained by the method, and the clutter in the corresponding direction of the Doppler channel is well suppressed, namely the estimated optimal interference phase is accurate.
Then M adjacent Doppler channels in the main clutter are applied to respectively obtain MWill->Andseen as unknowns, an equation (9) is constructed, which corresponds to a matrixThe expression ax=b, and the least squares solution of the equation is x= (a) T A) -1 A T b. Taking 2π sin θ as abscissa and ψ as ordinate, the least squares solution thereof is the slope corresponding to the straight line, as shown in FIG. 3, the slope of the straight line can be obtained to be 12.24, namely +.>Is 12.24. Let ψ=0, we can find +.>The corresponding value is 19.24rad.
As shown in fig. 4, in the actual processing, DBS imaging processing may be performed on multiple-wavelength data of 1 channel, and a region with a relatively concentrated target may be cut from the DBS imaging result, where the region is 10km×6km. The horizontal direction is the azimuth direction, the vertical direction is the distance direction, four crossed highways exist in a scene, and a large number of moving objects (mainly vehicles) are concentrated on the highways. Then, the foregoing method for locating the target of the wide area GMTI system based on interference phase maximum likelihood fitting is adopted, and 56 moving targets detected in one scanning period are marked in the obtained DBS image, as shown in fig. 4, and the target signals are marked by white.
Example III
A third embodiment of the present invention provides a target positioning device including:
the data processing unit is used for determining target interference phases of different Doppler channels by suppressing the sharpening ratio; the method comprises the steps of,
determining a target azimuth according to the target interference phase;
and the positioning unit is used for completing positioning based on the target azimuth angle.
The embodiment of the invention is used for realizing the accurate positioning of the targets with two apertures, and the target interference phases of different Doppler channels are mainly determined through the defined sharpening suppression ratio, so that the target positioning according to the target interference phases can be realized, and the target positioning precision is improved.
The embodiment of the invention also provides a scanning moving target detection system which comprises the target positioning device.
The embodiment of the invention also provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program realizes the steps of the first and second target positioning methods when being executed by a processor.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.

Claims (4)

1. A method of locating a target, comprising:
determining target interference phases of different Doppler channels by suppressing the sharpening ratio;
determining a target azimuth according to the target interference phase;
completing positioning based on the target azimuth;
before determining the target interference phases of different Doppler channels by suppressing the sharpening ratio, the method comprises:
determining a corresponding sharpening suppression ratio according to the ratio of complex signals in the set range-Doppler unit before and after clutter suppression; the distance Doppler unit is obtained according to the main beam direction selection of the corresponding Doppler channel;
determining target interference phases for different Doppler channels by suppressing sharpening ratios, comprising:
the direction of a differential beam zero point formed by the sub-apertures corresponding to the Doppler channels is adjusted so as to filter out ground clutter in the direction of the corresponding main beam;
determining the optimal interference phase between adjacent Doppler channels by using the suppression sharpening ratio based on the angular domain corresponding to the Doppler channels after filtering the ground noise;
determining target interference phases for different Doppler channels by suppressing the sharpening ratio further comprises:
constructing a phase equation set according to the optimal interference phases among a plurality of adjacent range-Doppler units in the main lobe;
solving the phase equation set, and determining a target interference phase and a corresponding phase parameter;
wherein the phase parameter comprises at least one of: actual wavelength, phase center-to-center spacing and amplitude-to-phase error;
determining target interference phases for different Doppler channels by suppressing the sharpening ratio further comprises:
performing conjugate multiplication on a received signal corresponding to the target interference phase;
filtering the main lobe phase ambiguity based on the received signal after conjugate multiplication;
determining a target azimuth from the target interference phase, comprising:
and determining a target phase angle based on the phase parameter according to the received signal with the main lobe phase ambiguity filtered.
2. A target positioning device, comprising:
the data processing unit is used for determining target interference phases of different Doppler channels by suppressing the sharpening ratio; the method comprises the steps of,
determining a target azimuth according to the target interference phase;
a positioning unit for completing positioning based on the target azimuth;
before determining the target interference phases of different Doppler channels by suppressing the sharpening ratio, the method comprises:
determining a corresponding sharpening suppression ratio according to the ratio of complex signals in the set range-Doppler unit before and after clutter suppression; the distance Doppler unit is obtained according to the main beam direction selection of the corresponding Doppler channel;
determining target interference phases for different Doppler channels by suppressing sharpening ratios, comprising:
the direction of a differential beam zero point formed by the sub-apertures corresponding to the Doppler channels is adjusted so as to filter out ground clutter in the direction of the corresponding main beam;
determining the optimal interference phase between adjacent Doppler channels by using the suppression sharpening ratio based on the angular domain corresponding to the Doppler channels after filtering the ground noise;
determining target interference phases for different Doppler channels by suppressing the sharpening ratio further comprises:
constructing a phase equation set according to the optimal interference phases among a plurality of adjacent range-Doppler units in the main lobe;
solving the phase equation set, and determining a target interference phase and a corresponding phase parameter;
wherein the phase parameter comprises at least one of: actual wavelength, phase center-to-center spacing and amplitude-to-phase error;
determining target interference phases for different Doppler channels by suppressing the sharpening ratio further comprises:
performing conjugate multiplication on a received signal corresponding to the target interference phase;
filtering the main lobe phase ambiguity based on the received signal after conjugate multiplication;
determining a target azimuth from the target interference phase, comprising:
and determining a target phase angle based on the phase parameter according to the received signal with the main lobe phase ambiguity filtered.
3. A scanning moving object detection system comprising an object positioning device according to claim 2.
4. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the object localization method according to claim 1.
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