CN109387836A - A kind of imaging method of Inverse Synthetic Aperture Radar - Google Patents
A kind of imaging method of Inverse Synthetic Aperture Radar Download PDFInfo
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- CN109387836A CN109387836A CN201811511108.1A CN201811511108A CN109387836A CN 109387836 A CN109387836 A CN 109387836A CN 201811511108 A CN201811511108 A CN 201811511108A CN 109387836 A CN109387836 A CN 109387836A
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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
- 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
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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
- 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
- G01S13/904—SAR modes
- G01S13/9064—Inverse SAR [ISAR]
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- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Radar, Positioning & Navigation (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a kind of imaging methods of Inverse Synthetic Aperture Radar, are related to Inverse Synthetic Aperture Radar field.Include: acquisition echo-signal, to echo-signal carry out distance to pulse compress；Inertial navigation information is obtained, the Range Walk Correction factor and the phase error compensation factor of the motion platform in non-ideal movement are calculated according to inertial navigation information；It is corrected according to the Range Walk Correction factor and the compressed echo-signal of phase error compensation factor pair pulse；The Fourier analysis that orientation is carried out to the echo-signal after correction, obtains imaging results.Imaging method provided by the invention, it can be realized Inverse Synthetic Aperture Radar and blur-free imaging carried out to target in the case where motion platform non-ideal movement, improve the resolution ratio of imaging, and, this method does not need to carry out hardware modifications to existing radar equipment in specific implementation, has good future in engineering applications.
Description
Technical field
The present invention relates to Inverse Synthetic Aperture Radar field more particularly to a kind of imaging methods of Inverse Synthetic Aperture Radar.
Background technique
Inverse Synthetic Aperture Radar (Inverse Synthetic Aperture Radar, ISAR) is opposite by moving target
Synthetic aperture is formed in the relative motion of radar, to carry out high-resolution imaging.
However, be located on motion platform when Inverse Synthetic Aperture Radar, when being moved with motion platform, to mobile target progress at
When picture, since motion platform is usually non-ideal movement, the imaging to mobile target can be made blooming effect occur, cause to be imaged
Azimuth resolution reduce.
Summary of the invention
The technical problem to be solved by the present invention is in view of the deficiencies of the prior art, provide a kind of Inverse Synthetic Aperture Radar
Imaging method and a kind of storage medium.
The technical scheme to solve the above technical problems is that
A kind of imaging method of Inverse Synthetic Aperture Radar, the Inverse Synthetic Aperture Radar is set on motion platform, described
Imaging method includes:
Obtain echo-signal, to the echo-signal carry out distance to pulse compress；
Inertial navigation information is obtained, range walk of the motion platform in non-ideal movement is calculated according to the inertial navigation information
Correction factor and the phase error compensation factor；
According to the Range Walk Correction factor and the compressed echo of the phase error compensation factor pair pulse
Signal is corrected；
The Fourier analysis that orientation is carried out to the echo-signal after correction, obtains imaging results.
The beneficial effects of the present invention are: imaging method provided by the invention, calculates motion platform non-by inertial navigation information
The Range Walk Correction factor and the phase error compensation factor when ideal movements, and echo-signal is corrected accordingly, it solves
Because motion platform non-ideal movement caused by there is the problem of blooming effect to the imaging of mobile target, can be realized inverse conjunction
Blur-free imaging is carried out to target in the case where motion platform non-ideal movement at aperture radar, improves the resolution ratio of imaging, and
And this method does not need to carry out hardware modifications to existing radar equipment in specific implementation, before there is good engineer application
Scape.
The another technical solution that the present invention solves above-mentioned technical problem is as follows:
A kind of storage medium is stored with instruction in the storage medium, when computer reads described instruction, makes the meter
Calculation machine executes imaging method as described in the above technical scheme.
The advantages of additional aspect of the invention, will be set forth in part in the description, and will partially become from the following description
It obtains obviously, or practice is recognized through the invention.
Detailed description of the invention
Fig. 1 is the flow diagram that the embodiment of the imaging method of Inverse Synthetic Aperture Radar of the present invention provides；
Fig. 2 a is the imaging results schematic diagram that the embodiment of the imaging method of Inverse Synthetic Aperture Radar of the present invention provides；
Fig. 2 b is the imaging results contrast schematic diagram that the embodiment of the imaging method of Inverse Synthetic Aperture Radar of the present invention provides.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and illustrated embodiment is served only for explaining the present invention,
It is not intended to limit the scope of the present invention.
Inverse Synthetic Aperture Radar (Inverse Synthetic Aperture Radar, ISAR) is by capturing moving target
Synthetic aperture is formed relative to the relative motion of radar, to carry out high-resolution imaging.In general, your synthetic aperture radar is fixed
On base, relative to earth's surface without relative motion, for detecting the target of aircraft class, and when Inverse Synthetic Aperture Radar is located at nobody
On the aircraft such as machine, with unmanned plane during flying, when on a surface target or surface vessel etc. is detected, due to the usual right and wrong of unmanned plane
Ideal movements can make the imaging to targets such as naval vessels blooming effect occur, and the azimuth resolution of imaging is caused to reduce.
Therefore, the imaging moving compensation method of the surface vessel target under study movement platform is improved to surface vessel mesh
Target imaging resolution is a problem in the urgent need to address.
As shown in Figure 1, the flow diagram that provides of embodiment of the imaging method for Inverse Synthetic Aperture Radar of the present invention, inverse
Synthetic aperture radar is set on motion platform, is moved with motion platform, which includes:
S1, obtain echo-signal, to echo-signal carry out distance to pulse compress.
It should be understood that the echo-signal obtained is obtained after Inverse Synthetic Aperture Radar detects target.
By to echo-signal carry out distance to pulse compress, can be realized the distance of target to separation, obtain distance
Echo-signal in frequency domain.
S2 obtains inertial navigation information, calculates Range Walk Correction of the motion platform in non-ideal movement according to inertial navigation information
The factor and the phase error compensation factor.
It should be understood that inertial navigation information refers to inertial navigation information, can be provided by inertial navigation system.
The Range Walk Correction factor and the phase error compensation factor are found out in the case where motion platform non-ideal movement
, it can be found out by preset formula according to the exercise data of motion platform.
S3 carries out school according to the Range Walk Correction factor and the compressed echo-signal of phase error compensation factor pair pulse
Just.
Specifically, the compressed echo-signal of pulse can be mended multiplied by the Range Walk Correction factor and phase error respectively
The factor is repaid, echo-signal is corrected.
S4 carries out the Fourier analysis of orientation to the echo-signal after correction, obtains imaging results.
As shown in Figure 2 a and 2 b, be respectively naval vessel that the imaging method provided through the invention is imaged at
As result schematic diagram, and the imaging results contrast schematic diagram on identical naval vessel being imaged by conventional method, it can from figure
To find out, compared to conventional method, in imaging results of the invention, the imaging results of surface vessel target is more clear, are had
Improve to effect the resolution ratio of imaging.
Imaging method provided in this embodiment calculates distance of the motion platform in non-ideal movement by inertial navigation information and walks
Dynamic correction factor and the phase error compensation factor, and echo-signal is corrected accordingly, solve the unreasonably because of motion platform
Think the problem of blooming effect occur to the imaging of mobile target caused by movement, it is flat in movement to can be realized Inverse Synthetic Aperture Radar
Blur-free imaging is carried out to target in the case where the non-ideal movement of platform, improves the resolution ratio of imaging, also, this method is implementing
When do not need to existing radar equipment carry out hardware modifications, have good future in engineering applications.
Optionally, in some embodiments, distance of the motion platform in non-ideal movement is calculated according to inertial navigation information to walk
Dynamic correction factor and the phase error compensation factor, specifically include:
Inertial navigation information is obtained, according to the vertical course-and-bearing error of inertial navigation information calculating motion platform and vertical course-and-bearing
Error；
According to vertical course-and-bearing error and vertical course-and-bearing error calculation along the kinematic error of wave beam direction of visual lines；
Range Walk Correction of the motion platform in non-ideal move is calculated according to the kinematic error along wave beam direction of visual lines
The factor and the phase error compensation factor.
It should be noted that inertial navigation information includes motion platform along direct north, due east direction and vertically downward direction
Velocity vector, number of pulses and pulse repetition period.
Optionally, in some embodiments, vertical course-and-bearing error is calculated according to the following formula:
Wherein, Δ y is vertical course-and-bearing error, vNIt is motion platform along the velocity vector of direct north, vEIt is flat to move
For platform along the velocity vector in due east direction, α is the angle of motion platform and direct north, tmFor slow time, tm=mTr, m is pulse
Quantity, TrFor the pulse repetition period,Indicate integration operation,It indicates to be averaging operation.
Optionally, in some embodiments, vertical course-and-bearing error is calculated according to the following formula:
Wherein, Δ z is vertical course-and-bearing error, vDIt is motion platform along the movement velocity vector of vertically downward direction, tm
For slow time, tm=mTr, m is number of pulses, TrFor the pulse repetition period,Indicate integration operation,It indicates to be averaging
Operation.
Optionally, in some embodiments, the kinematic error along wave beam direction of visual lines is calculated according to the following formula:
Δ r=Δ z cos β+Δ y sin β
Wherein, Δ r is the kinematic error along wave beam direction of visual lines, and Δ y is vertical course-and-bearing error, and Δ z is vertical boat
Line deflection error, β are downwards angle of visibility, and H is the height of motion platform, RsFor scene center away from.
Optionally, in some embodiments, the Range Walk Correction factor is calculated according to the following formula:
Wherein, H11(fr,tm) it is the Range Walk Correction factor, frFor frequency of distance, c is the light velocity, and Δ r is along wave beam sight
The kinematic error in direction, tmFor slow time, tm=mTr, m is number of pulses, TrFor the pulse repetition period.
Optionally, in some embodiments, the phase error compensation factor is calculated according to the following formula:
Wherein, H12(τ,tm) it is the phase error compensation factor, τ is the fast time, and λ is radar wavelength, and Δ r is along wave beam sight
The kinematic error in direction, tmFor slow time, tm=mTr, m is number of pulses, TrFor the pulse repetition period.
Optionally, in some embodiments, obtain echo-signal, to echo-signal carry out distance to pulse compress, tool
Body includes:
Obtain echo-signal；
Echo-signal is obtained to discrete Fourier transform is carried out in the echo data in frequency domain in distance；
Preliminary corrections are carried out to echo data by Range Walk Correction function；
To after preliminary corrections echo data carry out distance to pulse compression；
To the compressed echo data of pulse distance to carry out inverse discrete Fourier transform.
It should be noted that preliminary Range Walk Correction factor H can be passed through0(fr,tm) preliminary school is carried out to echo data
Just:
Wherein Δ R (tm)≈-vsin(θ0)tm, v is the speed of motion platform, θ0It is transported for the wave beam sight and carrier aircraft of radar
The angle of the normal direction in dynamic direction, frFor frequency of distance, value range isFsFor sample frequency, tmWhen being slow
Between, tm=mTr, m is number of pulses, TrFor the pulse repetition period, c is the light velocity.
It should be understood that can be realized by the echo data after preliminary corrections is carried out in frequency domain multiplied by apart from pulse pressure function
Distance to pulse compression, formula can be with are as follows:
Wherein, γrIndicate the modulation frequency of the linear FM signal of transmitting, frIndicate frequency of distance.
Optionally, in some embodiments, according to the Range Walk Correction factor and phase error compensation factor pair pulse pressure
After echo-signal after contracting is corrected, further includes:
Range curvature correction is carried out to the echo-signal after correction.
It should be noted that can realize range curvature by the echo-signal after correction multiplied by the range curvature correction factor
Correction.
Specifically, the range curvature correction factor can be with are as follows:
Wherein, RsIt is scene center away from v is the speed of motion platform, and λ is radar wavelength, faFor Doppler frequency, value
Range isfrFor pulse recurrence frequency.
It is appreciated that in some embodiments, may include such as implementation optional some or all of in the various embodiments described above
Mode.
In other embodiments of the invention, a kind of storage medium is also provided, instruction is stored in the storage medium, works as meter
It calculates machine-readable when taking the instruction, computer is made to execute the imaging method as described in any one of above-described embodiment.
Reader should be understood that in the description of this specification reference term " one embodiment ", " is shown " some embodiments "
The description of example ", " specific example " or " some examples " etc. mean specific features described in conjunction with this embodiment or example, structure,
Material or feature are included at least one embodiment or example of the invention.In the present specification, above-mentioned term is shown
The statement of meaning property need not be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described
It may be combined in any suitable manner in any one or more of the embodiments or examples.In addition, without conflicting with each other, this
The technical staff in field can be by the spy of different embodiments or examples described in this specification and different embodiments or examples
Sign is combined.
It is apparent to those skilled in the art that for convenience of description and succinctly, the dress of foregoing description
The specific work process with unit is set, can refer to corresponding processes in the foregoing method embodiment, details are not described herein.
In several embodiments provided herein, it should be understood that disclosed device and method can pass through it
Its mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of unit, only
A kind of logical function partition, there may be another division manner in actual implementation, for example, multiple units or components can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.
Unit may or may not be physically separated as illustrated by the separation member, shown as a unit
Component may or may not be physical unit, it can and it is in one place, or may be distributed over multiple networks
On unit.It can select some or all of unit therein according to the actual needs to realize the mesh of the embodiment of the present invention
's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, is also possible to two or more units and is integrated in one unit.It is above-mentioned integrated
Unit both can take the form of hardware realization, can also realize in the form of software functional units.
It, can if integrated unit is realized in the form of SFU software functional unit and when sold or used as an independent product
To be stored in a computer readable storage medium.Based on this understanding, technical solution of the present invention substantially or
Say that all or part of the part that contributes to existing technology or the technical solution can embody in the form of software products
Out, which is stored in a storage medium, including some instructions are used so that a computer equipment
(can be personal computer, server or the network equipment etc.) executes all or part of each embodiment method of the present invention
Step.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-OnlyMemory), deposits at random
The various media that can store program code such as access to memory (RAM, RandomAccessMemory), magnetic or disk.
More than, only a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto, and it is any to be familiar with
Those skilled in the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or substitutions,
These modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be wanted with right
Subject to the protection scope asked.
Claims (10)
1. a kind of imaging method of Inverse Synthetic Aperture Radar, the Inverse Synthetic Aperture Radar are set on motion platform, feature
It is, the imaging method includes:
Obtain echo-signal, to the echo-signal carry out distance to pulse compress；
Inertial navigation information is obtained, Range Walk Correction of the motion platform in non-ideal movement is calculated according to the inertial navigation information
The factor and the phase error compensation factor；
According to the Range Walk Correction factor and the compressed echo-signal of the phase error compensation factor pair pulse
It is corrected；
The Fourier analysis that orientation is carried out to the echo-signal after correction, obtains imaging results.
2. imaging method according to claim 1, which is characterized in that calculate the motion platform according to the inertial navigation information
The Range Walk Correction factor and the phase error compensation factor in non-ideal movement, specifically include:
Obtain inertial navigation information, according to the inertial navigation information calculate the motion platform vertical course-and-bearing error and vertical course line
Deflection error；
It is missed according to the vertical course-and-bearing error and the vertical course-and-bearing error calculation along the movement of wave beam direction of visual lines
Difference；
Range walk of the motion platform in non-ideal move is calculated according to the kinematic error along wave beam direction of visual lines
Correction factor and the phase error compensation factor.
3. imaging method according to claim 2, which is characterized in that calculate the vertical course-and-bearing according to the following formula
Error:
Wherein, Δ y is vertical course-and-bearing error, vNIt is the motion platform along the velocity vector of direct north, vEFor the fortune
For moving platform along the velocity vector in due east direction, α is the angle of the motion platform and direct north, tmFor slow time, tm=mTr,
M is number of pulses, TrFor the pulse repetition period,Indicate integration operation,It indicates to be averaging operation.
4. imaging method according to claim 2, which is characterized in that calculate the vertical course-and-bearing according to the following formula
Error:
Wherein, Δ z is vertical course-and-bearing error, vDIt is the motion platform along the movement velocity vector of vertically downward direction, tm
For slow time, tm=mTr, m is number of pulses, TrFor the pulse repetition period,Indicate integration operation,It indicates to be averaging
Operation.
5. imaging method according to claim 2, which is characterized in that calculate according to the following formula described along wave beam sight side
To kinematic error:
Δ r=Δ zcos β+Δ ysin β
Wherein, Δ r is the kinematic error along wave beam direction of visual lines, and Δ y is vertical course-and-bearing error, and Δ z is vertical course line side
To error, β is downwards angle of visibility, and H is the height of the motion platform.
6. imaging method according to claim 2, which is characterized in that calculate the Range Walk Correction according to the following formula
The factor:
Wherein, H11(fr,tm) it is the Range Walk Correction factor, frFor frequency of distance, c is the light velocity, and Δ r is along wave beam direction of visual lines
Kinematic error, tmFor slow time, tm=mTr, m is number of pulses, TrFor the pulse repetition period.
7. imaging method according to claim 2, which is characterized in that calculate the phase error compensation according to the following formula
The factor:
Wherein, H12(τ,tm) it is the phase error compensation factor, τ is the fast time, and λ is radar wavelength, and Δ r is along wave beam direction of visual lines
Kinematic error, tmFor slow time, tm=mTr, m is number of pulses, TrFor the pulse repetition period.
8. imaging method according to any one of claim 1 to 7, which is characterized in that echo-signal is obtained, to described time
Wave signal carry out distance to pulse compression, specifically include:
Obtain echo-signal；
The echo-signal is obtained to discrete Fourier transform is carried out in the echo data in frequency domain in distance；
Preliminary corrections are carried out to the echo data by Range Walk Correction function；
To after preliminary corrections the echo data carry out distance to pulse compression；
The echo data compressed to pulse distance to carry out inverse discrete Fourier transform.
9. imaging method according to any one of claim 1 to 7, which is characterized in that according to the Range Walk Correction
After the factor and the compressed echo-signal of the phase error compensation factor pair pulse are corrected, further includes:
Range curvature correction is carried out to the echo-signal after correction.
10. a kind of storage medium, which is characterized in that instruction is stored in the storage medium, when computer reads described instruction
When, so that the computer is executed imaging method as claimed in any one of claims 1-9 wherein.
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