CN110045375A - A kind of processing method and system of bit SAR echo data - Google Patents
A kind of processing method and system of bit SAR echo data Download PDFInfo
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Abstract
The processing method and system of an a kind of bit SAR echo data provided by the invention, pass through and carry out a bit quantization to the SAR echo data received, the echo data sequence after obtaining a bit quantization；According to default carry digit, each data value in echo data sequence after one bit quantization is subjected to convolution algorithm with the data value in matched filter sequence respectively, SAR echo data sequence after obtaining convolution algorithm, reduce the calculation amount and complexity of convolution algorithm, reduce the cost of SAR system, improve the arithmetic speed and efficiency of system, and it ensure that the image quality of SAR image after matched filtering at the same time, therefore there is preferable real-time and higher power dissipation ratio of performance in data processing.
Description
Technical field
The present invention relates to signal processing technology field, more particularly to an a kind of bit SAR echo data processing method and
System.
Background technique
SAR (Synthetic Aperture Radar, synthetic aperture radar) imaging has round-the-clock, round-the-clock, remote work
With distance, high-resolution detectivity, played in various fields such as remote sensing mapping, region detection, geological prospecting, disaster reliefs
Important role is the research hotspot of domestic and foreign scholars.But with the increase of SAR signal bandwidth, data acquisition, is passed storage
Defeated, processing burden gradually aggravates.On the one hand, SAR system needs to carry out echo data high-precision sampling complete to retain
Signal characteristic, cause data processing bit wide to increase, more stringent requirements are proposed to the hardware performance of system；On the other hand, believe
Number sample rate is also required to correspondingly promote the aliasing to avoid signal spectrum, so that data volume increases, reduces at data
The efficiency of reason.One bit sample can reduce data bit width, but in order to improve the image quality of a bit data, and need to improve
Sample rate, it is therefore desirable to study efficient, high-precision bit SAR echo data processing method.
A bit SAR echo data processing method disclosed in the prior art respectively there are several types of:
First method, by greatly reducing the data volume of imaging to echo-signal one bit quantization of progress, from
And greatly simplify imaging implementation complexity.But the bit quantization in this method be by echo data and 0 into
Row compares, and will cause the loss of signal amplitude information, influences image quality.
Random time-dependent threshold value is introduced into a bit sample by second method, absolute to original signal so as to realize
The high quality resume of amplitude information, the integrality of information when ensure that bit signal reconstruct.But this method is built upon original
Under the premise of signal has sparse characteristic, it is difficult to be applied in the non-sparse scene of SAR imaging.
The third method carries out a bit quantization to cheating interference using Gauss time-varying threshold value, so as to be imaged in SAR
Effective false target imaging results are obtained in processing, but Gauss time-varying threshold value can introduce noise like in imaging results and do
It disturbs, reduces image quality.
Fourth method improves imaging performance by sample rates more than four times of bandwidth in a bit sample, but adjoint
Higher hamonic wave influence imaging the problem of do not solve.
Therefore, SAR echo signal processing method disclosed at present is not met by efficient and high-precision requirement, existing skill
Art has yet to be improved and developed.
Summary of the invention
In view of the deficiencies in the prior art, it is an object of that present invention to provide a kind of processing methods of a bit SAR echo data
And system, it is intended to solve guarantee while cannot achieve simplified operation in the prior art when carrying out bit SAR data processing
Image quality cannot accomplish the defect of efficient and high-precision echo data processing.
Technical scheme is as follows:
The present invention provides a kind of processing methods of a bit SAR echo data, wherein comprising steps of
A, a bit quantization is carried out to the SAR echo data received, the echo data sequence after obtaining a bit quantization；
B, according to default carry digit, respectively and in advance by each data value in the echo data sequence after a bit quantization
Data value in the matched filter sequence of setting carries out convolution algorithm, the SAR echo data sequence after obtaining convolution algorithm；Institute
Default carry digit is stated greater than 1；
C, within the time of pulse persistance transmitting, repeat the above steps A and step B, the SAR echo after obtaining matched filtering
Data.
Optionally, the step B includes:
B1, the data value of matched filter sequence is divided into sign bit and data bit；
B2, every carry digit, by data value in the first echo data sequence after a bit quantization respectively with the symbol
Position carries out XOR operation, and the data bit of new sign bit that operation obtains respectively corresponding thereto is spliced and combined, and obtains second
Echo data sequence；
B3, summation operation is carried out to each element in the second echo data sequence, the SAR after obtaining matched filtering
Echo data sequence.
Optionally, the step A further include:
A01, emit chirp pulse signal to detected target using SAR；
A02, SAR receiver receive the echo-signal being reflected back through the detected target, and generate single-frequency time-varying threshold value；
A03, one bit quantization is carried out to SAR echo signal using the single-frequency time-varying threshold value, the echo after being quantified
Data sequence.
Optionally, the data in the acquisition data sequence contain real part and imaginary part；The data bit contains real part and void
Portion；
The step B2 further include:
By the real and imaginary parts of data in the acquisition data sequence sampled out respectively with the real part of the data bit and
Imaginary part carries out convolution algorithm.
Optionally, in the step A02 further include:
A021, the echo-signal received is sampled with preset sample frequency；Wherein, the preset sample frequency is big
In four times of echo-signal bandwidth.
Optionally, in the step A02 further include:
A022, SAR are received and are generated single-frequency time-varying threshold value using local oscillator or Direct Digital Synthesizer.
Optionally, in the step A03 further include:
A031, by vector h represented by vector s corresponding to element each in echo-signal and the single-frequency time-varying threshold value
It is compared, if s<h, echo data is stored as 0, if s>=h, echo data is stored as 1.
The present invention also provides a kind of processing systems of a bit SAR echo data, wherein includes: SAR receiver；
The SAR receiver includes: that data sequence generation module, matched filtering module and pulse compressed data generate mould
Block；
The data sequence generation module obtains a ratio for carrying out a bit quantization to the SAR echo data received
Echo data sequence after spy's quantization；
Matched filtering module is used for according to default carry digit, will be each in the echo data sequence after a bit quantization
Data value carries out convolution algorithm with the data value in preset matched filter sequence respectively, after obtaining convolution algorithm
SAR echo data sequence；The default carry digit is greater than 1；
Pulse compressed data generation module, for the A and step B that within the time that pulse persistance emits, repeats the above steps,
SAR echo data after obtaining matched filtering.
Optionally, the matched filtering module includes:
Numerical value cutting unit, for the data value of matched filter sequence is divided into a bit sign bit and long bit wide
Data bit；
XOR operation unit is used for every carry digit, by data value in the first echo data sequence after a bit quantization
XOR operation is carried out with the sign bit respectively, and the data bit of the new sign bit that operation is obtained respectively corresponding thereto is spliced
Combination, obtains the second echo data sequence；
Summation operation unit is obtained for carrying out summation operation to each element in the second echo data sequence
SAR echo data sequence after matched filtering.
Optionally, further includes: SAR, the SAR receiver are arranged in SAR platform；
The SAR, for according to preset impulse ejection interval, repeating to detected target transmitting chirp letter
Number.
The present invention provides the processing method and system of an a kind of bit SAR echo data, by echo data into
It when row matched filtering, extracts, reduce the calculation amount of convolution algorithm and answers using to the use sequence for participating in convolution algorithm
Miscellaneous degree reduces the cost of SAR system, improves the arithmetic speed and efficiency of system, and ensure that matched filtering at the same time
The image quality of SAR image afterwards, therefore there is preferable real-time and higher power dissipation ratio of performance in data processing.
Detailed description of the invention
Fig. 1 is the flow chart of the preferred embodiment of the processing method of one bit SAR echo data of one kind of the invention；
Fig. 2 is the schematic illustration of XOR operation in the method for the invention；
Fig. 3 is that 16bit*1bit XOR operation realizes hardware elementary diagram；
Fig. 4 is the principle of work and power frame of the preferred embodiment of the processing system of one bit SAR echo data of one kind of the invention
Figure；
Fig. 5 is before a bit echo is sampled with matched filter convolution；
Fig. 6 is after a bit echo is sampled with matched filter convolution.
Specific embodiment
To make the purpose of the present invention, technical solution and effect clearer, clear and definite, below to the present invention further specifically
It is bright.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention provides a kind of processing methods of a bit SAR echo data, as shown in Figure 1, comprising steps of
Step S1, a bit quantization is carried out to the SAR echo data received, the echo data after obtaining a bit quantization
Sequence.
This step is sampled processing to the echo data sequence after a bit quantization, according to the preset sampling interval, according to
Echo data is extracted in the secondary echo data sequence from after a bit quantization.Wherein presetting the sampling interval is oneself greater than 1
So number, preferably, the default sampling interval can be set to 4 data breaks, to realize in simplified echo data sequence
While the data volume contained, guarantee the filter effect of matched filter.
It is further comprising the steps of before this step in order to get the echo data sequence after a bit quantization:
S01, emit chirp pulse signal to detected target using SAR；
S02, SAR receiver receive the echo-signal being reflected back through the detected target, and generate single-frequency time-varying threshold value；
S03, one bit quantization is carried out to SAR echo signal using the single-frequency time-varying threshold value, the echo after being quantified
Data sequence.
SAR (Synthetic Aperture Radar, synthetic aperture radar) is using an antenna along long-line array
Track constant speed movement simultaneously radiates coherent signal, Coherent processing is carried out in the received echo of different location, to obtain compared with high score
The imaging radar of resolution.The SAR emits chirp pulse signal to detected target according to predetermined pulse transmission interval.
After detected target receives the chirp pulse signal, reflection echo signal is arranged in SAR platform
SAR receiver receives the echo-signal, and carries out a bit quantization to the echo-signal.The SAR platform can be installed
On aircraft, satellite or automobile.
In order to reduce the influence of spectral aliasing, the echo-signal received is sampled with preset sample frequency；Wherein,
The preset sample frequency is greater than four times of echo-signal bandwidth.
Optionally, in the step S02 further include:
S022, SAR are received and are generated single-frequency time-varying threshold value using local oscillator or Direct Digital Synthesizer.
Optionally, in the step S03 further include:
S031, by vector h represented by vector s corresponding to element each in echo-signal and the single-frequency time-varying threshold value
It is compared, if s<h, echo data is stored as 0, if s>=h, echo data is stored as 1.
Specifically, the step of carrying out a bit quantization to the echo-signal is as follows:
1, assume trIt is s that moment, which emits signal,0(tr), it is t from the time for receiving echo is transmitted signals to, what is received returns
Wave is s (tr).With sample rate FsThe signal received is sampled, an available echo signal sample sequence, this time
Wave signal sample sequence can be expressed as the vector s of M × 1, i.e. [s1,s2,…,sm,…,sM], wherein 1≤m≤M.
2, SAR receiver is generated in the way of local oscillator or Direct Digital Synthesizer (DDS) with frequency
Rate is f0Single-frequency time-varying threshold value hs(tr), equally with FsSingle-frequency time-varying threshold value is sampled, then threshold value can be expressed as one
The vector h of M × 1, i.e. [h1,h2,…,hm,…,hM], wherein 1≤m≤M.
3, by one bit quantization of echo-signal, the corresponding element of vector s and h are successively compared, and are with m-th of element
Example, if sm≥hm, echo data is stored as 1；If sm< hmEcho data is stored as 0.So as to obtain being made of 0 and 1
A bit quantization after echo data sequence.
Step S2, according to default carry digit, each data value in the echo data sequence after a bit quantization is distinguished
Convolution algorithm is carried out with the data value in matched filter sequence, the SAR echo data sequence after obtaining convolution algorithm；It is described pre-
If carry digit is greater than 1.
To the echo data sequence and matched filter sequence progress convolution algorithm after a bit quantization in above-mentioned steps S1.
Specifically, this convolution algorithm be not be directly by the sample data sequence sampled out data value with match filter
Data value two multiplications in wave device sequence, then product is summed up, obtained convolution sum, but XOR operation is utilized to replace
Multiplying in former convolution algorithm, to achieve the purpose that reduce operand.
The matched filter realizes the function of two aspects, first is that carry out pulse compression, i.e. filter is wanted and echo
Match, second is that realizing the down-sampled of output echo-signal.
Further, in order to realize that echo matches, filter receptance function should be the complex conjugate of baseband signal, by its turn
To frequency domain representation are as follows:
Wherein, Tr is SAR signal pulse width, γ is frequency modulation rate.Based on above formula it can be seen that being based on rectangular window function
Rect [] realizes the filtering to echo-signal, and furthermore exponential function part shows the phase-frequency characteristic and baseband signal phase of filter
Instead, it is ensured that phase is 0 after signal passes through filter, reach matching effect.
On the other hand, it uses to realize to the down-sampled of echo-signal, in this step and shifts to calculating data value
Operation, that is to say and be separated by default carry digit, a convolutional calculation is carried out, to reduce operand.It is former by Noble identity
It is identical in the effect extract or interpolation obtains as first progress matched filtering to carry out matched filtering every several points again for reason.
Therefore can be by first carrying out shifting function in this step, the method for obtaining matched filtering reduces the operand of convolution algorithm.
Specifically, the sample data sequence sampled out and matched filter sequence are carried out convolution algorithm in the step S2
Include:
The data bit of S21, the sign bit that the data value of matched filter sequence is divided into a bit and long bit wide.
S22, every carry digit, by data value in the first echo data sequence after a bit quantization respectively with the symbol
Position carries out XOR operation, and the data bit of new sign bit that operation obtains respectively corresponding thereto is spliced and combined, and obtains second
Echo data sequence.
S23, summation operation is carried out to each element in the second echo data sequence, after obtaining matched filtering
SAR echo data sequence.
As shown in Fig. 2, the sign bit and data bit of data value in matched filter sequence are extracted in above-mentioned steps first, it will
Input of the sign bit extracted as XOR operation, the first echo data sequence after a bit quantization is defeated as another
Enter.After XOR operation operation, we will export result as sign bit, then by the data bit phase of itself and matched filter
In conjunction with.The final output of the operation is consistent with traditional multiplying.
It is illustrated in figure 3 the hardware schematic of above-mentioned XOR operation, is realized by one 2 input NOR gate circuit above-mentioned different
Or operation, it is respectively that the first echo data sequence of the sign bit of matched filter sequence and a bit quantization is defeated as another
Enter, then output result is combined with the data bit of matched filter.
In the convolution algorithm in step S22, since the data in the acquisition data sequence contain real part and imaginary part；Institute
It states data bit and contains real part and imaginary part；Therefore specific convolution algorithm includes:
By the real and imaginary parts of data in the acquisition data sequence sampled out respectively with the real part of the data bit and
Imaginary part carries out convolution algorithm.
Other than the convolution algorithm between convolution algorithm, imaginary part and the imaginary part between corresponding real part and real part, further includes:
Convolution algorithm between real part and convolution.Assuming that 1-bit echo sequence is (A+Bj), MF matched filter sequence is (C+Dj),
Convolution value in the result of convolution algorithm between real part and real part are as follows:
A+Bj*C+Dj=A*C-B*D+A*D+B*Cj
It include also shifting function in above-mentioned convolution algorithm, i.e., before carrying out convolution algorithm, by its of two sequence datas
In after a sequence carries out fold operation, when carrying out convolution algorithm, according to the mobile position of setting, successively from a bit quantization
The first echo data sequence in extract the data value of corresponding position, and the data value extracted is added to convolution algorithm
In, to reduce operand.
Such as: it is N that selection, which removes digit, when acquire the convolution value of than the m-th data value after, in displacement, by traditionally
1 unit of movement in convolution shifting function is changed to shift N number of unit, seeks the convolution value of the m+N element.Traverse entire sequence
Afterwards, the convolution sequence obtained is the sampling results of traditional convolution, it is down-sampled after frequency (sequence length) be 1/N before extraction.
Wherein, N is preferably 4.
Step S3, in the recurrence interval of impulse ejection, repeat the above steps A and step B, after obtaining matched filtering
SAR echo data.
In the recurrence interval of different impulse ejections, step S1~step S2 is repeated, by the bit after matched filtering
SAR echo data sequence successively stores, until the process of SAR imaging terminates.It is hereby achieved that a bit needed for SAR imaging
SAR echo data carries out the imaging results that available focusing is imaged using imaging algorithm to it.
The volume of matched filtering process is imaged in calculating SAR using the characteristic of the SAR echo signal of a bit quantization in the present invention
Product is taken with exclusive or logic gate in calculating and replaces multiplying, take shifting function to carry out calculating preceding extraction to convolution, significantly
The subsequent processing complexity for reducing a bit SAR data, reduces the cost of SAR system, and improves the operation of system
Speed and operation efficiency reach better real-time and higher power dissipation ratio of performance, are a kind of more economical effective realization sides
Method.
More detailed description is done to the convolution algorithm method in the method for the invention below.
Assuming that input signal is the complex signal of IQ two-way, echo data sequence x (n) after a respectively bit quantization and
The matched filter sequences h (n) of default settings, sample frequency FsFor 6 times of bandwidth, to the frequency of data is fallen to 1.5 times
Bandwidth then achievees the purpose that extract before calculating by having calculated 4 units of backward shift of sign bit XOR logic operation every time.
Assuming that the length that the length of x (n) is 10, h (n) is 5, then it is as shown in the table for its arrangement situation for starting sequence:
In upper table, y (n) is the echo data sequence x (n) and the matched filter sequence of default settings after a bit quantization
The convolution of h (n).
The calculating of convolution is as described below:
Step 1: the training of one of data is turned down, preferably, the data that length in two column datas is short
Sequence fold, is expressed as follows:
Step 2: corresponding first data element does XOR operation in two data sequences, and by XOR operation result phase
Add, obtain first corresponding data element and do the data value 0 after convolution algorithm, which is denoted as: y (0) to indicate such as
Under:
Step 3: doing shifting function, mobile Unit 4 to h (n), and calculate corresponding second data element after shifting function
Convolution, the data value after the convolution algorithm of second corresponding element is denoted as y (1), is expressed as follows:
4th step repeats above-mentioned third step, shifting function is done to h (n), after calculating shifting function, by three corresponding elements
Data value after convolution algorithm is denoted as y (2).
5th step repeats above-mentioned convolution, the data value after the 4th corresponding element convolution algorithm is denoted as: y (4).
Repeat above-mentioned operation, successively obtain in x (n) sequence in each data element and h (n) sequence each data element it
Between convolution value, to obtain the matched filter sequence of echo data sequence x (n) and default settings after an entire bit quantization
Arrange the convolution of h (n).
The present invention also provides a kind of processing system of a bit SAR echo data, such as Fig. 4, comprising: SAR receiver；
The SAR receiver includes: that data sequence generation module 100, matched filtering module 200 and pulse compressed data are raw
At module 300；
The data sequence generation module 100 is obtained for carrying out a bit quantization to the SAR echo data received
Echo data sequence after one bit quantization；Its function is as described in step S1.
The matched filtering module 200 is used for according to default carry digit, will be in the echo data sequence after a bit quantization
Each data value respectively in preset matched filter sequence data value carry out convolution algorithm, obtain convolution algorithm
SAR echo data sequence afterwards；The default carry digit is greater than 1；Its function is as described in step S2.
The pulse compressed data generation module 300, within the time of impulse ejection, obtaining by multiple groups SAR echo
SAR echo data after the matched filtering of data sequence composition, function is as described in step S3.
Further, the matched filtering module 200 includes:
Numerical value cutting unit, for the data value of matched filter sequence is divided into a bit sign bit and long bit wide
Data bit；
Convolution algorithm unit, for the acquisition data sequence sampled out and the position that meets to be carried out XOR logic fortune
It calculates, and the operation result that XOR logic operation obtains is re-started with the data bit and is spliced and combined, obtain convolution algorithm knot
Fruit.
In order to get the echo-signal that detected target is reflected back, further includes: SAR, the SAR receiver are arranged in institute
It states on SAR；
The SAR, for according to preset impulse ejection interval, repeating to detected target transmitting chirp letter
Number.
The method of the invention and system have as follows compared with the processing method of SAR echo signal in the prior art
Advantage:
(1) bit quantization is carried out using to echo-signal in terms of data acquisition.
If to carry out 16bit quantization to data, complexity, the cost of required analog-digital converter (ADC) will be much
Higher than the complexity and cost for it being quantified as 1bit.Simultaneously as the complexity and cost of 1bit are lower, its sample rate
Can be more many than being higher by for 16bit, this is the advantage in terms of data acquisition.
(2) in the convolution algorithm of matched filtering, ginseng replaces multiplying with XOR operation.
It needs to carry out echo data matched filtering in SAR imaging, and matched filtering is carried out to echo data and is generally required
A large amount of multiplication, add operation are carried out, the numerical value storage of SAR system is carried out in the form of binary.For 3 × 3
(4bit acquires data × 4bit matched filter), the binary computations formula for needing to carry out are 4b0011 × 4b0011=
8b0000_1001.In the method for the invention using acquisition data be reduced to 1bit, only 0 or 1, so be exactly 1b0 ×
4b0011 (1bit acquires data × 4bit matched filter), specific calculation method is exactly will be in 1bit data 0 and 4b0011
Highest order (sign bit) 0 carry out logical operation (XOR, XOR logic), then result is spliced, obtained result bit wide than before
It reduces, carries out single bit data multiplying using XOR, reduce hardware complexity and cost.
(3) in convolution sample process, using shifting function.
If acquisition data length is m, matched filter length is l, and l < m.After one of signal is turned down with
Another signal seeks multiply-add operation, and the length for finally obtaining convolution signal result is m+l-1, and multiplying amount is l (m+l-1),
The amount of addition operations is (l-1) (m+l-1).If being by the last length of the method for preceding sampling translation before calculatingMultiply
Method calculation amount isThe amount of addition operations isWith data volume is reduced, calculating speed is improved, height is avoided
Over-sampling rate bring data volume increases problem, while guaranteeing the quality of matched filter.
Effect of the invention can further illustrate by emulation experiment below, and when emulation is carried out using MATLAB software
Emulation.
The parameter for emulating data is as follows: Fig. 5 show the SAR imaging results of conventional sampling with high precision, based on single shown in Fig. 6
Frequency time-varying threshold value carries out a bit quantization to echo data, then utilizes the result of bit data imaging.Due to a bit quantity
Change reduce data precision, there are certain noises compared to Fig. 5 by Fig. 6, but the targets such as building, road, vehicle in scene according to
It can so differentiate.
The processing method and system of an a kind of bit SAR echo data provided by the invention, by the SAR received
Echo data carries out a bit quantization, the echo data sequence after obtaining a bit quantization；According to default carry digit, by a bit
Each data value in echo data sequence after quantization carries out convolution algorithm with the data value in matched filter sequence respectively,
SAR echo data sequence after obtaining convolution algorithm, reduces the calculation amount and complexity of convolution algorithm, reduces SAR system
Cost, improve the arithmetic speed and efficiency of system, and ensure that at the same time SAR image after matched filtering at image quality
Amount, therefore there is preferable real-time and higher power dissipation ratio of performance in data processing.
It should be understood that the application of the present invention is not limited to the above for those of ordinary skills can
With improvement or transformation based on the above description, all these modifications and variations all should belong to the guarantor of appended claims of the present invention
Protect range.
Claims (10)
1. a kind of processing method of a bit SAR echo data, which is characterized in that comprising steps of
A, a bit quantization is carried out to the SAR echo data received, the echo data sequence after obtaining a bit quantization；
B, according to default carry digit, by each data value in the echo data sequence after a bit quantization respectively with preset
Matched filter sequence in data value carry out convolution algorithm, the SAR echo data sequence after obtaining convolution algorithm；It is described pre-
If carry digit is greater than 1；
C, within the time of pulse persistance transmitting, repeat the above steps A and step B, the SAR number of echoes after obtaining matched filtering
According to.
2. the processing method of bit SAR echo data according to claim 1, which is characterized in that the step B packet
It includes:
B1, the data value of matched filter sequence is divided into sign bit and data bit；
B2, every carry digit, by data value in the first echo data sequence after a bit quantization respectively with the sign bit into
Row XOR operation, and the data bit of new sign bit that operation obtains respectively corresponding thereto is spliced and combined, obtain the second echo
Data sequence；
B3, summation operation is carried out to each element in the second echo data sequence, the SAR echo after obtaining matched filtering
Data sequence.
3. the processing method of bit SAR echo data according to claim 1, which is characterized in that the step A is also wrapped
It includes:
A01, emit chirp pulse signal to detected target using SAR；
A02, SAR receiver receive the echo-signal being reflected back through the detected target, and generate single-frequency time-varying threshold value；
A03, one bit quantization is carried out to SAR echo signal using the single-frequency time-varying threshold value, the echo data after being quantified
Sequence.
4. the processing method of bit SAR echo data according to claim 3, which is characterized in that the acquisition data
Data in sequence contain real part and imaginary part；The data bit contains real part and imaginary part；
The step B2 further include:
By the real and imaginary parts of data in the acquisition data sequence sampled out real and imaginary parts with the data bit respectively
Carry out convolution algorithm.
5. the processing method of bit SAR echo data according to claim 2 or 3, which is characterized in that the step
In A02 further include:
A021, the echo-signal received is sampled with preset sample frequency；Wherein, the preset sample frequency, which is greater than, is
Four times of echo-signal bandwidth.
6. the processing method of bit SAR echo data according to claim 2 or 3, which is characterized in that the step
In A02 further include:
A022, SAR are received and are generated single-frequency time-varying threshold value using local oscillator or Direct Digital Synthesizer.
7. the processing method of bit SAR echo data according to claim 6, which is characterized in that in the step A03
Further include:
A031, vector h represented by vector s corresponding to element each in echo-signal and the single-frequency time-varying threshold value is carried out
Compare, if s<h, echo data is stored as 0, if s>=h, echo data is stored as 1.
8. a kind of processing system of a bit SAR echo data characterized by comprising SAR receiver；
The SAR receiver includes: data sequence generation module, matched filtering module and pulse compressed data generation module；
The data sequence generation module obtains a bit quantity for carrying out a bit quantization to the SAR echo data received
Echo data sequence after change；
Matched filtering module is used for according to default carry digit, by each data in the echo data sequence after a bit quantization
Value carries out convolution algorithm with the data value in preset matched filter sequence respectively, and the SAR after obtaining convolution algorithm is returned
Wave data sequence；The default carry digit is greater than 1；
Pulse compressed data generation module, for the SAR number of echoes within the time that pulse persistance emits, after obtaining matched filtering
According to.
9. the processing system of bit SAR echo data according to claim 8, which is characterized in that the matched filtering
Module includes:
Numerical value cutting unit, for the data value of matched filter sequence to be divided into the sign bit of a bit and the data of long bit wide
Position；
XOR operation unit is used for, every carry digit, data value in the first echo data sequence after a bit quantization is distinguished
XOR operation, and the data bit splicing group of the new sign bit that operation is obtained respectively corresponding thereto are carried out with the sign bit
It closes, obtains the second echo data sequence；
Summation operation unit is matched for carrying out summation operation to each element in the second echo data sequence
Filtered SAR echo data sequence.
10. the processing system of bit SAR echo data according to claim 8, which is characterized in that further include: SAR,
The SAR receiver is arranged in SAR platform；
The SAR, for repeating to emit chirp pulse signal to detected target according to preset impulse ejection interval.
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| Publication number | Priority date | Publication date | Assignee | Title |
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