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CN116500612B - A polarization-information-driven microwave correlation imaging method - Google Patents

A polarization-information-driven microwave correlation imaging method

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Publication number
CN116500612B
CN116500612B CN202310580539.8A CN202310580539A CN116500612B CN 116500612 B CN116500612 B CN 116500612B CN 202310580539 A CN202310580539 A CN 202310580539A CN 116500612 B CN116500612 B CN 116500612B
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polarization
antenna
target
imaging
radiation field
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CN116500612A (en
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代大海
田润坤
孙士龙
庞礴
纪朋徽
邢世其
李永祯
王雪松
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National University of Defense Technology
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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
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
    • 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
    • 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
    • G01S7/024—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using polarisation effects
    • 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
    • G01S7/411—Identification of targets based on measurements of radar reflectivity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

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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

本发明公开了雷达信号处理技术领域的一种极化信息驱动的微波关联成像方法。该极化信息驱动的微波关联成像方法包括以下步骤：构造全极化跳频雷达矩阵；形成水平极化和垂直极化时空随机辐射场；利用随机辐射场的正交补空间，迭代成像。该极化信息驱动的微波关联成像方法能够利用极化信息对目标进行高分辨率和高鲁棒性的成像，并在成像的同时进行瞬时极化测量，工程实现简单，有很强的工程应用潜力，可以推广到地图侦察、目标识别等实际场景中，快速、准确获取目标区域成像和目标极化信息。

This invention discloses a polarization-information-driven microwave correlation imaging method in the field of radar signal processing technology. The method includes the following steps: constructing a fully polarized frequency-hopping radar matrix; forming horizontally and vertically polarized spatiotemporally random radiation fields; and iteratively imaging using the orthogonal complement space of the random radiation fields. This polarization-information-driven microwave correlation imaging method can achieve high-resolution and robust imaging of targets using polarization information, and performs instantaneous polarization measurement simultaneously with imaging. It is simple to implement in engineering and has strong potential for engineering applications. It can be extended to practical scenarios such as map reconnaissance and target recognition, enabling rapid and accurate acquisition of target area imaging and target polarization information.

Description

Polarization information driven microwave correlation imaging method
Technical Field
The invention relates to the technical field of radar signal processing, in particular to a polarization information driven microwave correlation imaging method.
Background
The most commonly used technologies in the current radar imaging method are a synthetic aperture imaging technology and a Doppler sharpening technology, but the method is dependent on a distance-Doppler effect, azimuth resolution is limited by aperture size, imaging dead areas exist, namely, the imaging effect in the relative motion directions (forward vision and oblique forward vision) is poor, the novel microwave correlation imaging method does not depend on Doppler information, the method has extremely high imaging potential, and a new direction is developed for the development of traditional radar imaging.
The microwave correlation imaging is from classical correlation imaging in optics, the optical classical correlation imaging is a technology for imaging a target to be detected by correlating two spatially related light beams by utilizing a quantum correlation principle, namely 'ghost imaging', the microwave correlation imaging is based on the principle, the thought of optical correlation is promoted to the microwave field to form a microwave correlation imaging technology, the microwave correlation imaging is imaging by correlating a radiation field which is highly random in time domain, space domain and frequency domain with echo information after radiating the target, and several angles of electromagnetic signals are described, besides the time domain, the space domain and the frequency domain, polarization domain is an important component part of the electromagnetic signals, the randomness of the radiation field in the microwave correlation imaging can be further improved and the imaging quality of a microwave correlation imaging method can be improved by introducing polarization information, but at present, the research on polarized microwave correlation imaging is very blank, and the related research only uses a polarization antenna to generate the radiation field and does not research the application of the polarization information in the whole imaging process.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a polarization information driven microwave correlation imaging method, which solves the technical problems that in the prior art, the research on polarization information is very blank and the research on the application of polarization information in the whole imaging process is lacking, can image a target with high resolution and high robustness by using the polarization information, and can perform instantaneous polarization measurement while imaging, has simple engineering realization and strong engineering application potential, can be popularized to actual scenes such as map reconnaissance, target identification and the like, and can rapidly and accurately acquire the imaging of a target area and the target polarization information.
In order to achieve the above object, the technical scheme of the present invention is as follows:
the invention provides a polarization information driven microwave correlation imaging method, which comprises the following steps:
s1, constructing a full polarization frequency hopping radar matrix;
s2, forming horizontal polarization and vertical polarization polarizing space-time random radiation fields;
s3, iterative imaging is performed by utilizing an orthogonal complement space of the random radiation field.
Further, the step S1 includes the following steps:
S11, arranging antennas of the frequency hopping radar at equal intervals along the wing direction of the aircraft to form a row of frequency hopping radar array in a multi-transmitting single-receiving mode;
S12, taking the middle full-polarization receiving antenna as a boundary, respectively distributing the horizontal polarization antenna and the vertical polarization antenna on two sides of the middle full-polarization receiving antenna;
s13, changing a target imaging area of the frequency hopping radar from a square area to a diamond area.
Further, the step S2 includes the following steps:
S21, setting a vector from the center of the radar array to a target scattering point position as Dividing M full polarization receiving and transmitting antennas into an H antenna and a V antenna, wherein the H antenna and the V antenna are respectively arranged at two sides of an antenna array;
S22, acquiring the incident field intensity of the whole antenna array to an imaging area;
S23, independently transmitting random frequency hopping signals through antennas with different polarization directions and randomly sampling the receiving antennas to form horizontal polarization space-time random radiation fields and vertical polarization space-time random radiation fields.
Further, the step S22 includes the following steps:
S221, the incident field intensity of the ith transmitting antenna to the target area is as follows:
wherein f Hi (t) and f Vi (t) are the random frequencies of the H antenna and the V antenna, respectively, γ i (t) is the random horizontal polarization angle, η i (t) is the random vertical polarization angle, Is an antenna position vector;
S222, the incident field intensity of the whole antenna array to an imaging area is as follows:
Further, the step S23 includes the following steps:
s231 formation of target region the random radiation field is of the formula:
s232, in the microwave correlation forward-looking imaging process, the random radiation field irradiates the target, then reflects to form an echo, and is received by a receiving antenna to obtain a target echo E Hr、EVr as follows:
S233, obtaining target scattering characteristics and target polarization scattering characteristics through inversion:
Further, the step S3 includes the following steps:
S31, if polarization information is not considered, TSVD processing is carried out on the space-time radiation field with insufficient randomness, then compression correlation operation is carried out on the echo and the space-time random radiation field, finally, a target scattering characteristic matrix is obtained, correlation imaging is achieved, and a formula of the target scattering characteristic matrix is simplified to E r＝Es σ under the condition that noise is not considered;
s32, if the polarization scattering matrix of the target is considered, solving the instantaneous polarization scattering matrix of the target by using a microwave correlation imaging method.
Further, the instantaneous polarization scattering matrix echo in S32 is expressed as:
EHr＝EHsSHH+EVsSHV
EVr＝EHsSHV+EVsSVV
if the above formula is to be solved, the radiation field of the H antenna and the radiation field of the V antenna are orthogonal, namely:
EVsEHs=0
Further, the step S32 includes the following steps:
S321, obtaining a horizontal polarization radiation field orthogonal complementary matrix and a vertical polarization radiation field orthogonal complementary matrix through QR decomposition, and carrying out cross multiplication on the orthogonal complementary matrix and echo information;
s322, forming a new association type and iterative imaging by the radiation field after the matrix obtained in the step S321 is processed in the same way.
Further, the step S321 includes the following steps:
S3211, performing QR decomposition on a radiation field matrix of a target, and calculating to obtain orthogonal complement spaces E Hsb and E Vsb of the radiation field matrices E Hs and E Vs;
S3212, multiplying the target HV echo by the HV radiation field orthogonal complement space respectively to obtain:
EHsbEHr＝EHsbEHsSHH+EHsbEVsSHV
EVsbEHr＝EVsbEHsSHH+EVsbEVsSHV
EHsbEVr＝EHsbEHsSVH+EHsbEVsSVV
EVsbEVr＝EVsbEHsSVH+EVsbEVsSVV
the characteristics of the orthogonal complement matrix are as follows:
EHsbEHs=0
EVsbEVs=0
Namely:
By adopting the technical scheme, the invention has the following advantages:
The invention provides a polarization information driven microwave associated imaging method, which divides an antenna of a frequency hopping radar array into an H antenna and a V antenna, utilizes random frequency modulation and random sampling of each antenna to respectively generate a horizontal polarization radiation field and a vertical polarization radiation field, utilizes orthogonal complement space of the HV antenna radiation field to carry out cross multiplication processing on echo information, then forms new associated and iterative imaging with the radiation field after the same processing, can carry out high-resolution and high-robustness imaging on a target by utilizing the polarization information, carries out instantaneous polarization measurement while imaging, has better effect than the traditional instantaneous polarization measurement method under the condition of low time-frequency product, improves the anti-interference capability engineering implementation of the microwave associated imaging, has strong engineering application potential, and can be popularized to actual scenes such as map reconnaissance, target identification and the like to rapidly and accurately acquire the imaging of a target area and the target polarization information.
Drawings
FIG. 1 is a flow chart of a polarization information driven microwave correlation imaging method of the present invention;
FIG. 2 is a schematic illustration of a geometric imaging of a polarization information driven microwave-dependent imaging application scenario of the present invention;
FIG. 3 is a simulation diagram of polarization information driven microwave correlation imaging of the present invention;
FIG. 4 is a graph comparing polarized microwave correlated imaging with conventional instantaneous polarization measurements PSL and I according to the present invention;
Fig. 5 is a graph comparing the anti-interference effect of the polarized microwave correlation imaging method of the present invention with that of the conventional microwave correlation imaging method.
Detailed Description
In the following detailed description of the embodiments of the present invention, reference is made to the accompanying drawings, in which it is to be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, 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.
Fig. 1 shows a flowchart of a method for polarization information driven microwave correlation imaging according to the present invention, and the method according to the present invention is further explained below with reference to fig. 1. The specific steps and effects of the invention are as follows:
FIG. 2 shows a geometrical imaging schematic of a polarization information driven microwave-dependent imaging application scenario of the present invention;
s1, constructing a full polarization frequency hopping radar matrix;
s1 comprises the following specific steps:
S11. as shown in figure 2, a row of antennas (1 2....n.) to form a frequency hopping radar array, a multiple transmit-receive form forming a column;
s12, the middle full-polarization receiving antenna A is used as a boundary, and the horizontal polarization antenna H and the vertical polarization antenna V are respectively distributed on two sides, so that left and right blurring can be effectively restrained, and the device is simple in structure and high in practicability;
s13, changing the target imaging area B from a general square area to a diamond area, so that the space correlation of random radiation fields generated by radar arrays arranged facing the aircraft wing in each scattering unit can be effectively reduced, and the imaging effect is improved.
S2, forming horizontal polarization and vertical polarization polarizing space-time random radiation fields;
S2 comprises the following specific steps:
S21, setting a vector from the center of the radar array to a target scattering point position as Dividing M full-polarization receiving and transmitting antennas into an H antenna and a V antenna, wherein the H antenna and the V antenna are respectively arranged at two sides of an antenna array, and the random frequencies of the two antennas are different;
S22, acquiring the incident field intensity of the whole antenna array to an imaging area;
The step S22 includes the steps of:
S221. Random frequencies of the H antenna and the V antenna are f Hi (t) and f Vi (t) respectively, a random horizontal polarization angle is gamma i (t), a random vertical polarization angle is eta i (t), and an antenna position vector is The incident field strength of the ith transmit antenna to the target area is as follows:
S222, the incident field intensity of the whole antenna array to an imaging area is as follows:
S23, independently transmitting random frequency hopping signals through antennas with different polarization directions and randomly sampling the receiving antennas to form horizontal polarization space-time random radiation fields and vertical polarization space-time random radiation fields.
S23 comprises the following specific steps:
s231 formation of target region the random radiation field is of the formula:
s232, in the microwave correlation forward-looking imaging process, the random radiation field irradiates the target, then reflects to form an echo, and is received by a receiving antenna to obtain a target echo E Hr、EVr as follows:
S233, obtaining target scattering characteristics and target polarization scattering characteristics through inversion:
s3, iterative imaging is performed by utilizing an orthogonal complement space of the random radiation field.
S31, if polarization information is not considered, TSVD processing is carried out on the space-time radiation field with insufficient randomness, then compression correlation operation is carried out on the echo and the space-time random radiation field, and finally a target scattering characteristic matrix is obtained, so that correlation imaging is realized. Equation (11) can be reduced to without regard to noise:
Er＝Esσ (12)
S32, if the polarization scattering matrix of the target is taken into consideration, the polarization scattering matrix of the target is obtained while the target is imaged, the above formula solution cannot be obtained, and the characteristics of different HV antenna radiation fields must be taken into consideration for calculation. Solving the polarization scattering matrix of the target is equivalent to instantaneous polarization measurement, namely, can be understood as solving the instantaneous polarization scattering matrix of the target by using a microwave correlation imaging method.
The echo at this time can be expressed as:
EHr＝EHsSHH+EVsSHV (13)
EVr＝EHsSHV+EVsSVV (14)
if the above equation is to be solved, the best effect is that the radiation field of the H antenna is orthogonal to the radiation field of the V antenna, even if:
EVsEHs=0 (15)
However, for microwave correlated imaging, the radiation field irradiated to the target is randomly uncontrollable, and even if the radiation field is directly generated by using a mask or other tools, the HV radiation field at the target cannot be ensured to be mutually orthogonal, so that only another auxiliary matrix can be selected to deform the HV radiation field during calculation.
S32 comprises the following specific steps:
S321, obtaining a horizontal polarization radiation field orthogonal complementary matrix and a vertical polarization radiation field orthogonal complementary matrix through QR decomposition, and carrying out cross multiplication on the orthogonal complementary matrix and echo information;
s321 includes the steps of:
S3211, performing QR decomposition on a radiation field matrix of a target, and calculating to obtain orthogonal complement spaces E Hsb and E Vsb of the radiation field matrices E Hs and E Vs;
S3212, multiplying the target HV echo by the HV radiation field orthogonal complement space respectively to obtain:
EHsbEHr＝EHsbEHsSHH+EHsbEVsSHV (16)
EVsbEHr＝EVsbEHsSHH+EVsbEVsSHV (17)
EHsbEVr＝EHsbEHsSVH+EHsbEVsSVV (18)
EVsbEVr＝EVsbEHsSVH+EVsbEVsSVV (19)
the characteristics of the orthogonal complement matrix are as follows:
Namely:
s322, forming a new association type and iterative imaging by the radiation field after the matrix obtained in the step S321 is processed in the same way.
Equation (21) can be solved by solving equation (12) to measure the instantaneous polarization scattering matrix of the target while imaging the target.
In order to verify the effect of the present invention, the method proposed by the present invention is initially verified in combination with simulation. Fig. 3 shows a simulation of polarization information driven microwave correlation imaging of the present invention, it should be understood that the simulation described in fig. 3 is merely illustrative of the present invention and is not intended to limit the present invention. Assuming that the bandwidth b=1 GHz of the frequency hopping signal, the pulse time width T p =0.2 us, the carrier frequency f 0 =5 GHz, the sampling rate f s =10 GHz, the number of antennas is 24, the plane distance is 500m, and the imaging area is set to be a plane of 20×20 meters, simulation results and analysis can be obtained as follows.
Fig. 3 (a) shows the state of the simulation target, the polarization distribution of the target scattering is shown, the space distribution of the target scattering is shown in the row and column of the simulation target, different target types are shown through lines and dots, the polarization scattering matrix of the target is randomly generated through simulation each time, fig. 3 (b) shows the space correlation of the random radiation field of one pulse, the space-time radiation field correlation of one sampling is shown in fig. 3 (b), the whole space correlation of the radiation field is spike-shaped, the extremely high autocorrelation of the space-time radiation field is represented, the radiation field condition of microwave correlation imaging is met, fig. 3 (c) shows the microwave correlation imaging result, namely the transverse cutting condition during one-time microwave correlation imaging, the imaging precision and resolution of the space-time distribution are visually shown in fig. 3 (c), the microwave correlation imaging result driven by the whole polarization information is shown in fig. 3 (d), and the microwave correlation imaging basically reaches the expected comparison with the target.
The target polarization scattering matrix measurements are shown in table 1 below,
TABLE 1 target polarization scattering matrix measurement results
It can be seen from table 1 that the measured target polarization scattering matrix is slightly erroneous, but has been substantially consistent, indicating that this method can be implemented to measure the instantaneous polarization matrix while imaging the target.
Fig. 4 is a graph comparing polarized microwave correlation imaging of the present invention with conventional instantaneous polarization measurement PSL and I, and comparing the polarized microwave correlation imaging method driven by polarization information of the present invention with conventional instantaneous polarization measurement method in order to further embody the advantages of the method in terms of measurement of polarization at any time. The instantaneous polarization measurement mainly uses the difference of H, V antenna two signals, so the difference degree of the two signals is an important basis for comparing the effect of the instantaneous polarization measurement, the difference is often measured by the autocorrelation and the cross correlation of the two signals, giuli defines two parameters in the research to describe the two signals, namely Isolation (I) and peak sidelobe level ratio (Peak Sidelobe Level, PSL), wherein the Isolation I is used for describing the signal orthogonality degree by the cross correlation of the signals, and the peak sidelobe level ratio PSL is used for describing the influence of the autocorrelation function sidelobes of the signals on the polarization scattering matrix measurement, so the instantaneous polarization measurement performance is evaluated by comparing PSL and I of the method with positive and negative linear frequency modulation signals used for general instantaneous polarization measurement. PSL and I are specifically defined as follows:
In the above description, i and j represent HV two polarized signal transmitting channels, The method is an autocorrelation function of signals, two paths of radiation fields of the HV antenna are calculated according to the above formula under the conditions that the time width T=0.2 mu s and the bandwidth is from 0.5GHz to 2.5GHz, the obtained results are shown in fig. 4, the change of PSL and I along with the time-frequency product of the signals is shown in fig. 4, a line represents PSL-polarized microwave correlation imaging, b line represents I-polarized microwave correlation imaging, c line represents I-traditional transient polarization measurement, and d line represents PSL-traditional transient polarization measurement. As can be seen from the comparison of PSL and I in two modes of polarized microwave correlation imaging and traditional instantaneous polarization measurement in FIG. 4, when the time-frequency product is smaller (Bτ < 340), peak Sidelobe Level (PSL) and isolation (I) of two paths of signals of an HV antenna of the polarized microwave correlation imaging method are higher than those of positive and negative chirp signals used in a common method by about 13dB and 3dB on average, so that the polarized microwave correlation imaging method has better instantaneous polarization measurement effect in a frequency product section, and can also be used for instantaneous polarization measurement by utilizing the polarized microwave correlation method, which is different from the common instantaneous polarization measurement method, the PSL has weak correlation with the time-frequency product of signals, which is determined by the randomness of radiation fields in the microwave correlation imaging, the microwave correlation imaging itself has high requirements on the randomness of the radiation fields, and is in a highly random state in the time domain and the frequency domain, so that the change of the time-frequency product has small influence degree on the randomness of the radiation fields, and the change amplitude of the time-frequency product is smaller than 0.4dB in the total time-frequency product section (100 Bτ < 500), thereby having the advantages of instantaneous polarization measurement can be obtained under the aspect of more instantaneous polarization measurement than the traditional method.
In order to further embody the anti-interference capability of the polarized information driven microwave correlation imaging method of the invention, the anti-interference capability is compared with that of the traditional microwave correlation imaging method under the condition of the same parameter (SNR=10dB), fig. 5 shows an anti-interference effect comparison graph of the polarized microwave correlation imaging method of the invention and the traditional microwave correlation imaging method, the simulation result is fig. 5, fig. 5 (a) is a simulation target, fig. 5 (b) is a traditional microwave correlation imaging result, fig. 5 (c) is a polarized microwave correlation imaging result, fig. 5 (d) is an error comparison of the traditional microwave correlation imaging method and the polarized microwave correlation imaging method of the invention, wherein an e-curve of fig. 5 (d) represents an NMSE-dependent SNR-dependent curve of the traditional microwave correlation imaging method, and an f-curve represents an E-dependent SNR-dependent curve of the polarized microwave correlation imaging method of the invention, and as can be seen from fig. 5, the anti-interference capability of the polarized microwave correlation imaging method is stronger, imaging quality is higher because the correlation imaging part calculates a polarization scattering matrix of the target while imaging, and the correlation effect is equivalent to the calculation of the correlation result is prevented from being effectively influenced by multiple times. Meanwhile, the simulation does not consider the influence of the polarized antenna on noise interference, and in the practical application process, the anti-interference capability of the polarized antenna is only stronger as the polarized antenna can only receive signals in the preset polarization direction.
Finally, it is pointed out that while the invention has been described with reference to a specific embodiment thereof, it will be understood by those skilled in the art that the above embodiments are provided for illustration only and not as a definition of the limits of the invention, and various equivalent changes or substitutions may be made without departing from the spirit of the invention, therefore, all changes and modifications to the above embodiments shall fall within the scope of the appended claims.

Claims (7)

1. The polarization information driven microwave correlation imaging method is characterized by comprising the following steps of:
s1, constructing a full polarization frequency hopping radar matrix;
the step S1 comprises the following steps:
S11, arranging antennas of the frequency hopping radar at equal intervals along the wing direction of the aircraft to form a row of frequency hopping radar array in a multi-transmitting single-receiving mode;
S12, taking the middle full-polarization receiving antenna as a boundary, respectively distributing the horizontal polarization antenna and the vertical polarization antenna on two sides of the middle full-polarization receiving antenna;
S13, changing a target imaging area of the frequency hopping radar from a square area to a diamond area;
s2, forming horizontal polarization and vertical polarization polarizing space-time random radiation fields;
the step S2 comprises the following steps:
S21, setting a vector from the center of the radar array to a target scattering point position as Dividing M full polarization receiving and transmitting antennas into an H antenna and a V antenna, wherein the H antenna and the V antenna are respectively arranged at two sides of an antenna array;
S22, acquiring the incident field intensity of the whole antenna array to an imaging area;
s23, independently transmitting random frequency hopping signals through antennas with different polarization directions and randomly sampling a receiving antenna to form horizontal polarization space-time random radiation fields and vertical polarization space-time random radiation fields;
s3, iterative imaging is performed by utilizing an orthogonal complement space of the random radiation field.
2. A polarization information driven microwave correlation imaging method according to claim 1, wherein S22 comprises the steps of:
S221, the incident field intensity of the ith transmitting antenna to the target area is as follows:
wherein f Hi (t) and f Vi (t) are the random frequencies of the H antenna and the V antenna, respectively, γ i (t) is the random horizontal polarization angle, η i (t) is the random vertical polarization angle, Is an antenna position vector;
S222, the incident field intensity of the whole antenna array to an imaging area is as follows:
3. a polarization information driven microwave correlation imaging method according to claim 1, wherein S23 comprises the steps of:
s231 formation of target region the random radiation field is of the formula:
s232, in the microwave correlation forward-looking imaging process, the random radiation field irradiates the target, then reflects to form an echo, and is received by a receiving antenna to obtain a target echo E Hr、EVr as follows:
S233, obtaining target scattering characteristics and target polarization scattering characteristics through inversion:
4. a polarization information driven microwave correlation imaging method according to claim 1, wherein S3 comprises the steps of:
S31, if polarization information is not considered, TSVD processing is carried out on the space-time radiation field with insufficient randomness, then compression correlation operation is carried out on the echo and the space-time random radiation field, finally, a target scattering characteristic matrix is obtained, correlation imaging is achieved, and a formula of the target scattering characteristic matrix is simplified to E r＝Es σ under the condition that noise is not considered;
s32, if the polarization scattering matrix of the target is considered, solving the instantaneous polarization scattering matrix of the target by using a microwave correlation imaging method.
5. The polarization-information driven microwave-dependent imaging method of claim 4, wherein the instantaneous polarization-scattering matrix echo in S32 is represented as:
EHr＝EHsSHH+EVsSHV
EVr＝EHsSHV+EVsSVV
if the above formula is solved, the radiation field of the H antenna and the radiation field of the V antenna are orthogonal, namely:
EVsEHs=0。
6. the polarization information driven microwave correlation imaging method of claim 4, wherein S32 comprises the steps of:
S321, obtaining a horizontal polarization radiation field orthogonal complementary matrix and a vertical polarization radiation field orthogonal complementary matrix through QR decomposition, and carrying out cross multiplication on the orthogonal complementary matrix and echo information;
s322, forming a new association type and iterative imaging by the radiation field after the matrix obtained in the step S321 is processed in the same way.
7. The polarization-information driven microwave-dependent imaging method of claim 6, wherein S321 comprises the steps of:
S3211, performing QR decomposition on a radiation field matrix of a target, and calculating to obtain orthogonal complement spaces E Hsb and E Vsb of the radiation field matrices E Hs and E Vs;
S3212, multiplying the target HV echo by the HV radiation field orthogonal complement space respectively to obtain:
EHsbEHr＝EHsbEHsSHH+EHsbEVsSHV
EVsbEHr＝EVsbEHsSHH+EVsbEVsSHV
EHsbEVr＝EHsbEHsSVH+EHsbEVsSVV
EVsbEVr＝EVsbEHsSVH+EVsbEVsSVV
the characteristics of the orthogonal complement matrix are as follows:
EHsbEHs=0
EVsbEVs=0
Namely:
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