CN109917385A - Long-distance frequency domain rapid imaging method and device for ground SAR (synthetic aperture radar) scanned by rotary arm - Google Patents
Long-distance frequency domain rapid imaging method and device for ground SAR (synthetic aperture radar) scanned by rotary arm Download PDFInfo
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Abstract
The invention discloses a remote frequency domain fast imaging method and a device for a cantilever scanning foundation SAR, wherein the method comprises the following steps: acquiring an echo time domain signal of a ground SAR scanned by a spiral arm; determining the distance between the observation target and the rotation center; if the distance between the observation target and the rotation center exceeds a threshold value: and obtaining an echo frequency domain signal according to the echo time domain signal, and performing frequency domain focusing on the echo frequency domain signal by using a matched filter, wherein a spherical wave is approximated to a plane wave to determine a transfer function of the matched filter, and obtaining a long-distance imaging result of the cantilever scanning foundation SAR according to a frequency domain focusing result. The invention improves the long-distance imaging quality while ensuring the calculation efficiency, avoids the problem of larger imaging result error in the frequency domain imaging process, and realizes the high-efficiency high-quality long-distance imaging of the cantilever scanning foundation SAR.
Description
Technical field
The present invention relates to earth observation microwave Imaging Technique field more particularly to the long distance frequency domains of spiral arm scanning ground SAR
Fast imaging method and device.
Background technique
Synthetic aperture radar (Synthetic Aperture Radar, SAR) is to realize high score using synthetic aperture principle
The microwave imaging distinguished has the various features such as round-the-clock, round-the-clock, high-resolution, big breadth comprising airborne, spaceborne etc. a variety of
The synthetic aperture radar that form platform carries is widely used in military, civil field.
Ground SAR forms orientation synthetic aperture in horizontal straight moving on rails by antenna and obtains SAR data, passes through
Deformation monitoring is used for the repeated measures acquisition time sequence interference data of target area in different time points, it is possible to provide long distance
From, a wide range of, continuous space covering deformation results, in the side such as deformation disaster monitoring, radar imagery New System and method validation
Face has important application, and compared with carried SAR, satellite-borne SAR, has the characteristics of maneuverability, low cost, real-time high-efficiency.
The synthetic aperture of spiral arm scanning ground SAR rotates generation by being attached to the antenna of spiral arm end, guarantees the view of system
Field energy is enough to cover a wide range of scene in primary observation, to effectively improve the ground monitoring efficiency of system.Carry out ground monitoring
When, spiral arm scan ground SAR can a wide range of, efficient feedback scan localized ground monitoring information, be the new of ground monitoring
Mode.Compared with traditional line scans ground SAR, spiral arm scanning ground SAR has the high advantage of big visual field, monitoring efficiency.
Ground SAR is scanned for spiral arm, antenna movement track is camber line, and this special motion profile is imaged to long distance
Increase difficulty.In the prior art, generally use time-domain imaging method realize spiral arm scanning ground SAR high-precision long distance at
Picture, but computational efficiency is lower.In order to realize quickly long distance imaging in real time, the frequency for spiral arm scanning ground SAR system is proposed
Domain imaging method, this method can effectively improve computational efficiency, but in long distance imaging, imaging results it is second-rate.
Summary of the invention
The embodiment of the present invention provides the long distance frequency domain fast imaging method of spiral arm scanning ground SAR a kind of, to spiral arm
Scan ground SAR acquisition data carry out at a distance quick real time imagery, while guaranteeing computational efficiency raising long distance at
Image quality amount avoids the problem that imaging results are second-rate in long distance imaging process, realizes that the high efficiency of spiral arm scanning ground SAR is high
The imaging of quality long distance, this method comprises:
Obtain the echo time-domain signal of spiral arm scanning ground SAR；
Determine the distance between observed object and rotation center；
If the distance between observed object and rotation center are more than threshold value:
Echo frequency-region signal is obtained according to the echo time-domain signal；
Frequency domain focusing is carried out to echo frequency-region signal using matched filter, wherein be plane wave by Spherical wave approximation, with
Determine the transmission function of the matched filter；
The long distance imaging results of spiral arm scanning ground SAR are obtained according to frequency domain focusing results.
The embodiment of the present invention provides the long distance frequency domain fast imaging device of spiral arm scanning ground SAR a kind of, to spiral arm
Scan ground SAR acquisition data carry out at a distance quick real time imagery, while guaranteeing computational efficiency raising long distance at
Image quality amount avoids the problem that imaging results are second-rate in long distance imaging process, realizes that the high efficiency of spiral arm scanning ground SAR is high
The imaging of quality long distance, the device include:
Time-domain signal obtains module, for obtaining the echo time-domain signal of spiral arm scanning ground SAR；
Apart from determining module, for determining the distance between observed object and rotation center；
Long distance image-forming module, if being more than threshold value for the distance between observed object and rotation center:
Echo frequency-region signal is obtained according to the echo time-domain signal；
Frequency domain focusing is carried out to echo frequency-region signal using matched filter, wherein be plane wave by Spherical wave approximation, with
Determine the transmission function of the matched filter；
The long distance imaging results of spiral arm scanning ground SAR are obtained according to frequency domain focusing results.
The embodiment of the present invention also provides a kind of computer equipment, including memory, processor and storage are on a memory simultaneously
The computer program that can be run on a processor, the processor realize following method when executing the computer program:
Obtain the echo time-domain signal of spiral arm scanning ground SAR；
Determine the distance between observed object and rotation center；
If the distance between observed object and rotation center are more than threshold value:
Echo frequency-region signal is obtained according to the echo time-domain signal；
Frequency domain focusing is carried out to echo frequency-region signal using matched filter, wherein be plane wave by Spherical wave approximation, with
Determine the transmission function of the matched filter；
The long distance imaging results of spiral arm scanning ground SAR are obtained according to frequency domain focusing results.
The embodiment of the present invention also provides a kind of computer readable storage medium, and the computer-readable recording medium storage has
Execute the computer program of following method:
Obtain the echo time-domain signal of spiral arm scanning ground SAR；
Determine the distance between observed object and rotation center；
If the distance between observed object and rotation center are more than threshold value:
Echo frequency-region signal is obtained according to the echo time-domain signal；
Frequency domain focusing is carried out to echo frequency-region signal using matched filter, wherein be plane wave by Spherical wave approximation, with
Determine the transmission function of the matched filter；
The long distance imaging results of spiral arm scanning ground SAR are obtained according to frequency domain focusing results.
The embodiment of the present invention scans the echo time-domain signal of ground SAR by obtaining spiral arm, determines observed object and rotation
The distance between center, if the distance between observed object and rotation center are more than threshold value: being obtained according to the echo time-domain signal
Echo frequency-region signal is obtained, frequency domain focusing then is carried out to echo frequency-region signal using matched filter, wherein by Spherical wave approximation
Spiral arm finally is obtained according to frequency domain focusing results and scans ground for plane wave with the transmission function of the determination matched filter
The long distance imaging results of SAR.The embodiment of the present invention meet observed object between rotation center at a distance from be more than threshold value item
It is the relatively simple plane wave of form by Spherical wave approximation the characteristics of imaging according to long distance under part, to the determination matching filter
The transmission function of wave device realizes quickly in real time to carry out frequency domain focusing to echo frequency-region signal using matched filter
Long distance imaging, effectively improves computational efficiency；By effectively controlling to the distance between observed object and rotation center given threshold
Plane-wave approximation bring error improves long distance image quality while guaranteeing computational efficiency, during avoiding frequency domain imaging
The larger problem of imaging results error realizes the high efficiency high quality long distance imaging of spiral arm scanning ground SAR.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.In the accompanying drawings:
Fig. 1 is the long distance frequency domain fast imaging method schematic diagram that spiral arm scans ground SAR in the embodiment of the present invention；
Fig. 2 is the long distance frequency domain fast imaging geometric representation that spiral arm scans ground SAR in the embodiment of the present invention；
Fig. 3 is the long distance frequency domain fast imaging structure drawing of device that spiral arm scans ground SAR in the embodiment of the present invention.
Specific embodiment
Understand in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, with reference to the accompanying drawing to this hair
Bright embodiment is described in further details.Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but simultaneously
It is not as a limitation of the invention.
In order to carry out quick real time imagery at a distance to the data of spiral arm scanning ground SAR acquisition, guaranteeing to calculate effect
Long distance image quality is improved while rate, avoids the problem that imaging results are second-rate in long distance imaging process, realizes that spiral arm is swept
The high efficiency high quality long distance imaging of ground SAR is retouched, the embodiment of the present invention provides the long distance frequency domain of spiral arm scanning ground SAR a kind of
Fast imaging method, as shown in Figure 1, this method may include:
Step 101, the echo time-domain signal for obtaining spiral arm scanning ground SAR；
Step 102 determines the distance between observed object and rotation center；
If the distance between step 103, observed object and rotation center are more than threshold value:
Echo frequency-region signal is obtained according to the echo time-domain signal；
Frequency domain focusing is carried out to echo frequency-region signal using matched filter, wherein be plane wave by Spherical wave approximation, with
Determine the transmission function of the matched filter；
The long distance imaging results of spiral arm scanning ground SAR are obtained according to frequency domain focusing results.
As shown in Figure 1 it is known that the embodiment of the present invention scans the echo time-domain signal of ground SAR by obtaining spiral arm,
Determine the distance between observed object and rotation center, if the distance between observed object and rotation center are more than threshold value: according to
The echo time-domain signal obtains echo frequency-region signal, and it is poly- then to carry out frequency domain to echo frequency-region signal using matched filter
Coke, with the transmission function of the determination matched filter, is finally focused according to frequency domain and is tied wherein being plane wave by Spherical wave approximation
Fruit obtains the long distance imaging results of spiral arm scanning ground SAR.The embodiment of the present invention is meeting between observed object and rotation center
Distance be more than threshold value under conditions of, the characteristics of imaging according to long distance, by Spherical wave approximation be the relatively simple plane wave of form,
To the transmission function of the determination matched filter, so that it is poly- to carry out frequency domain to echo frequency-region signal using matched filter
Coke realizes quickly long distance imaging in real time, effectively improves computational efficiency；By between observed object and rotation center away from
From given threshold, plane-wave approximation bring error is effectively controlled, long distance image quality is improved while guaranteeing computational efficiency,
The problem that imaging results error is larger during frequency domain imaging is avoided, realizes that the high efficiency high quality of spiral arm scanning ground SAR is remote
Away from imaging.
Fig. 2 is the long distance frequency domain fast imaging geometric representation that spiral arm scans ground SAR in the embodiment of the present invention, and antenna is logical
Overwinding upper-arm circumference forms circular trace around vertical middle shaft rotation, carries out ring to surrounding and sweeps observation, observes visual field up to 360 degree.x-y-z
For rectangular coordinate system, z be height to.A is antenna phase center position, θbwIt is antenna bearingt to beam angle.P is observed object
(assuming that being located on antenna Plane of rotation)；R is jib length, i.e. the radius of spiral arm scanning ground SAR；θ is antenna rotation angle,
That is the orientation of system, ω are antenna angular velocity of rotation, R0It is observed object at a distance from rotation center.
When it is implemented, obtaining the echo time-domain signal of spiral arm scanning ground SAR.
In embodiment, the echo time-domain signal of spiral arm scanning ground SAR, the acquisition methods of echo time-domain signal are obtained first
For the prior art, those skilled in the art can understand spiral arm by inspection information and scan obtaining for ground SAR echo time-domain signal
Method is taken, the present invention is no longer specifically described.
In embodiment, the dimension that spiral arm scans the echo time-domain signal of ground SAR is 2.
When it is implemented, determining the distance between observed object and rotation center.
In embodiment, after the echo time-domain signal for obtaining spiral arm scanning ground SAR, determine in observed object and rotation
The distance between heart R0。
When it is implemented, if the distance between observed object and rotation center are more than threshold value:
Echo frequency-region signal is obtained according to the echo time-domain signal；
Frequency domain focusing is carried out to echo frequency-region signal using matched filter, wherein be plane wave by Spherical wave approximation, with
Determine the transmission function of the matched filter；
The long distance imaging results of spiral arm scanning ground SAR are obtained according to frequency domain focusing results.
In the prior art, the high-precision long distance imaging that time-domain imaging method realizes spiral arm scanning ground SAR is generallyd use, but
Computational efficiency is lower.In order to realize quickly long distance imaging in real time, the frequency domain imaging for spiral arm scanning ground SAR system is proposed
Method, this method can effectively improve computational efficiency, but in long distance imaging, imaging results it is second-rate.Inventor
It was found that the characteristics of being imaged according to long distance, meet observed object between rotation center at a distance from be more than threshold value under conditions of, ball
Surface wave can be approximated to be the relatively simple plane wave of form and then utilize to the transmission function of the determination matched filter
Matched filter carries out frequency domain focusing to echo frequency-region signal, and long distance imaging in real time may be implemented quickly, effectively improve calculating
Efficiency.Therefore, threshold value is set to the distance between observed object and rotation center in the embodiment of the present invention, if observed object with
The distance between rotation center is more than threshold value, obtains echo frequency-region signal according to the echo time-domain signal, then utilizes matching
Filter carries out frequency domain focusing to echo frequency-region signal, wherein being plane wave by Spherical wave approximation, with the determination matched filtering
The transmission function of device finally obtains the long distance imaging results of spiral arm scanning ground SAR according to frequency domain focusing results.By to observation
The distance between target and rotation center given threshold effectively control plane-wave approximation bring error, are guaranteeing computational efficiency
While improve long distance image quality, avoid the problem that imaging results error is larger during frequency domain imaging, realize spiral arm scanning
The high efficiency high quality long distance of ground SAR is imaged.
In embodiment, when meeting following condition, determine that the distance between observed object and rotation center are more than threshold value:
Wherein, θbwIt is antenna bearingt to beam angle, r is jib length, i.e. the radius of spiral arm scanning ground SAR, R0For
The distance between observed object and rotation center, λ are transmitting signal wavelength.
In embodiment, if the distance between observed object and rotation center are more than threshold value, first basis as follows
Echo time-domain signal obtains echo frequency-region signal:
To echo time-domain signal carry out distance to pulse compression；
Adjust the distance to pulse compress result carry out orientation Fast Fourier Transform (FFT), obtain echo frequency-region signal.
In the present embodiment, if the two-dimentional echo time-domain signal of spiral arm scanning ground SAR is S1(ta,tr), wherein taFor orientation
To time, trIt is distance to the time, two-dimentional echo time-domain signal is orientation time domain-apart from time-domain signal, first to two-dimentional echo
Time-domain signal carry out distance to pulse compression, obtain distance to pulse compress as a result, i.e. orientation time domain-apart from frequency domain believe
Number, it is expressed as S2(ta, f), wherein f is transmitting signal baseband frequency.Then adjust the distance to pulse compress result carry out orientation
To Fast Fourier Transform (FFT), obtain two-dimentional echo frequency-region signal, i.e. orientation frequency domain-is expressed as S apart from frequency-region signal3(fθ,
F), wherein fθIt is orientation frequency.
In embodiment, after obtaining echo frequency-region signal, it is poly- that frequency domain is carried out to echo frequency-region signal using matched filter
Coke, wherein being plane wave by Spherical wave approximation, with the transmission function of the determination matched filter.
In embodiment, as follows to echo frequency-region signal carry out frequency domain focusing: by echo frequency-region signal with match filter
The transmission function of wave device is multiplied, and obtains frequency domain focusing results.
In embodiment, the matched filter for carrying out frequency domain focusing to echo frequency-region signal can be two-dimentional matched filter.
In embodiment, frequency domain focusing is carried out to two-dimentional echo frequency-region signal using two-dimentional matched filter, by two-dimentional echo
Frequency-region signal S3(fθ, f) and transfer function H (f with two-dimentional matched filterθ, f) and it is multiplied, obtain two-dimensional frequency focusing results S4
(fθ, f), the expression formula of transmission function are as follows:
Wherein, H (fθ, f) and it is transmission function, f is transmitting signal baseband frequency, fcTo emit signal center frequency, fθThe side of being
Bit frequency, C are the light velocity, and r is jib length, and ω is antenna angular velocity of rotation.
In embodiment, after carrying out frequency domain focusing to echo frequency-region signal using matched filter, is focused and tied according to frequency domain
Fruit obtains the long distance imaging results of spiral arm scanning ground SAR as follows: it is inverse to carry out fast Fourier to frequency domain focusing results
Transformation.
In embodiment, two-dimentional inverse fast Fourier transform is carried out to frequency domain focusing results, obtains spiral arm scanning ground SAR's
Long distance imaging results.
In embodiment, firstly, to two-dimensional frequency focusing results S4(fθ, f) and two-dimentional inverse fast Fourier transform is carried out, it obtains
Two-dimensional time-domain signal S5(ta,tr), then by such as down conversion: θ=ω ta,By orientation time trWith distance to
Time taIt is separately converted to angle and distance, obtains the two-dimentional long distance imaging results S for obtaining spiral arm scanning ground SAR6(θ,R)。
Based on the same inventive concept, the embodiment of the invention also provides the long distance frequency domain of spiral arm scanning ground SAR a kind of is fast
Fast imaging device, as described in the following examples.The long distance frequency of principle and spiral arm scanning the ground SAR solved the problems, such as due to these
Domain fast imaging method is similar, therefore the implementation of device may refer to the implementation of method, and overlaps will not be repeated.
Fig. 3 is the structure chart for the long distance frequency domain fast imaging device that spiral arm scans ground SAR in the embodiment of the present invention, is such as schemed
Shown in 3, which includes:
Time-domain signal obtains module 301, for obtaining the echo time-domain signal of spiral arm scanning ground SAR；
Apart from determining module 302, for determining the distance between observed object and rotation center；
Long distance image-forming module 303, if being more than threshold value for the distance between observed object and rotation center:
Echo frequency-region signal is obtained according to the echo time-domain signal；
Frequency domain focusing is carried out to echo frequency-region signal using matched filter, wherein be plane wave by Spherical wave approximation, with
Determine the transmission function of the matched filter；
The long distance imaging results of spiral arm scanning ground SAR are obtained according to frequency domain focusing results.
In one embodiment, long distance image-forming module is further used for: when meeting following condition, determining observed object and rotation
Turn the distance between center more than threshold value:
Wherein, θbwIt is antenna bearingt to beam angle, r is jib length, i.e. the radius of spiral arm scanning ground SAR, R0For
The distance between observed object and rotation center, λ are transmitting signal wavelength.
In one embodiment, long distance image-forming module is further used for: carrying out frequency domain to echo frequency-region signal as follows
It focuses:
Echo frequency-region signal is multiplied with the transmission function of matched filter, obtains frequency domain focusing results.
In conclusion the embodiment of the present invention scans the echo time-domain signal of ground SAR by obtaining spiral arm, observation mesh is determined
The distance between mark and rotation center, if the distance between observed object and rotation center are more than threshold value: when according to the echo
Domain signal obtains echo frequency-region signal, then frequency domain focusing is carried out to echo frequency-region signal using matched filter, wherein by ball
Surface wave is approximately plane wave, with the transmission function of the determination matched filter, finally obtains spiral arm according to frequency domain focusing results
Scan the long distance imaging results of ground SAR.The embodiment of the present invention meet observed object between rotation center at a distance from be more than
It is the relatively simple plane wave of form by Spherical wave approximation, to determine institute the characteristics of imaging according to long distance under conditions of threshold value
The transmission function of matched filter is stated, to carry out frequency domain focusing to echo frequency-region signal using matched filter, is realized fast
Fast long distance imaging in real time, effectively improves computational efficiency；By to the distance between observed object and rotation center given threshold,
Effectively control plane-wave approximation bring error, while guaranteeing computational efficiency raising long distance image quality, avoid frequency domain at
The larger problem of imaging results error as during realizes the high efficiency high quality long distance imaging of spiral arm scanning ground SAR.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe in detail it is bright, it should be understood that the above is only a specific embodiment of the present invention, the guarantor being not intended to limit the present invention
Range is protected, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in this
Within the protection scope of invention.
Claims (10)
1. a kind of long distance frequency domain fast imaging method of spiral arm scanning ground SAR characterized by comprising
Obtain the echo time-domain signal of spiral arm scanning ground SAR；
Determine the distance between observed object and rotation center；
If the distance between observed object and rotation center are more than threshold value:
Echo frequency-region signal is obtained according to the echo time-domain signal；
Frequency domain focusing is carried out to echo frequency-region signal using matched filter, wherein being plane wave by Spherical wave approximation, with determination
The transmission function of the matched filter；
The long distance imaging results of spiral arm scanning ground SAR are obtained according to frequency domain focusing results.
2. the method as described in claim 1, which is characterized in that further include: when meeting following condition, determine observed object with
The distance between rotation center is more than threshold value:
Wherein, θbwIt is antenna bearingt to beam angle, r is jib length, i.e. the radius of spiral arm scanning ground SAR, R0For observation
The distance between target and rotation center, λ are transmitting signal wavelength.
3. the method as described in claim 1, which is characterized in that carry out frequency domain focusing to echo frequency-region signal as follows:
Echo frequency-region signal is multiplied with the transmission function of matched filter, obtains frequency domain focusing results.
4. method as claimed in claim 3, which is characterized in that the expression formula of the transmission function are as follows:
Wherein, H (fθ, f) and it is transmission function, f is transmitting signal baseband frequency, fcTo emit signal center frequency, fθIt is orientation frequency
Rate, C are the light velocity, and r is jib length, and ω is antenna angular velocity of rotation.
5. the method as described in claim 1, which is characterized in that as follows obtain spiral arm scanning ground SAR long distance at
As result:
Inverse fast Fourier transform is carried out to frequency domain focusing results.
6. a kind of long distance frequency domain fast imaging device of spiral arm scanning ground SAR characterized by comprising
Time-domain signal obtains module, for obtaining the echo time-domain signal of spiral arm scanning ground SAR；
Apart from determining module, for determining the distance between observed object and rotation center；
Long distance image-forming module, if being more than threshold value for the distance between observed object and rotation center:
Echo frequency-region signal is obtained according to the echo time-domain signal；
Frequency domain focusing is carried out to echo frequency-region signal using matched filter, wherein being plane wave by Spherical wave approximation, with determination
The transmission function of the matched filter；
The long distance imaging results of spiral arm scanning ground SAR are obtained according to frequency domain focusing results.
7. device as claimed in claim 6, which is characterized in that long distance image-forming module is further used for: meeting following condition
When, determine that the distance between observed object and rotation center are more than threshold value:
Wherein, θbwIt is antenna bearingt to beam angle, r is jib length, i.e. the radius of spiral arm scanning ground SAR, R0For observation
The distance between target and rotation center, λ are transmitting signal wavelength.
8. device as claimed in claim 6, which is characterized in that long distance image-forming module is further used for: as follows to return
Wave frequency-region signal carries out frequency domain focusing:
Echo frequency-region signal is multiplied with the transmission function of matched filter, obtains frequency domain focusing results.
9. a kind of computer equipment including memory, processor and stores the meter that can be run on a memory and on a processor
Calculation machine program, which is characterized in that the processor realizes any side of claim 1 to 5 when executing the computer program
Method.
10. a kind of computer readable storage medium, which is characterized in that the computer-readable recording medium storage has perform claim
It is required that the computer program of 1 to 5 any the method.
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| CN110596702A (en) * | 2019-07-29 | 2019-12-20 | 武汉大学 | River basin reservoir bank deformation monitoring method based on ground stable platform SAR |
| CN112305539A (en) * | 2020-09-25 | 2021-02-02 | 北方工业大学 | ArcSAR polar coordinate format imaging method based on spherical wave decomposition |
| CN114397660A (en) * | 2022-01-24 | 2022-04-26 | 中国科学院空天信息创新研究院 | Processing method and processing chip for SAR real-time imaging |
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