CN104215951B - System and method for detecting low-speed small target under sea cluster background - Google Patents
System and method for detecting low-speed small target under sea cluster background Download PDFInfo
- Publication number
- CN104215951B CN104215951B CN201410412033.7A CN201410412033A CN104215951B CN 104215951 B CN104215951 B CN 104215951B CN 201410412033 A CN201410412033 A CN 201410412033A CN 104215951 B CN104215951 B CN 104215951B
- Authority
- CN
- China
- Prior art keywords
- detection
- detector unit
- radar
- unit
- speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
- G01S7/414—Discriminating targets with respect to background clutter
Abstract
The invention discloses a system and a method for detecting a low-speed small target under a sea cluster background. The method includes that S1, a radar transceiving unit acquires signals of the low-speed moving small target under the sea cluster background; S2, the radar transceiving unit sends received signals to a radar echo processing unit to be processed to generate radar echo data and sends the radar echo data to a detection unit; S3, the detection unit processes multiple continuous radar echoes and establishes corresponding time frequency domain two-dimension planar graphs to effectively eliminate false-alarm targets in different areas. The system and the method are suitable for detection of dim and small targets moving at low speed under sea cluster background interference during downward-looking detection of sea-surface targets through radar. By the system and the method, the problem of radar downward-looking detection of the low-speed moving small target under the sea cluster background can be solved; time frequency domain CFAR (constant false alarm rate) processing technology is adopted to decompose target echoes and sea cluster data to a time frequency domain two-dimension plane for processing.
Description
Technical field
The present invention relates to Radar Targets'Detection technology, and in particular to a kind of detection of Small object at a slow speed under sea clutter background
System and its detection method.
Background technology
Existing radar system has more ripe detection method to high-speed motion Small object under Sea background.According to high-speed motion
Small object echo Doppler and difference of the sea clutter Doppler on frequency domain, realize that target ties up the detection without clutter area in frequency domain.
And at a slow speed the radar return Doppler and sea clutter Doppler of Weak target all close to 0, Small object echo " will be flooded "
In sea clutter, the correct detection of radar system is affected.
Wherein, one of prior art proposes a kind of BOS-CFAR object detection methods, using biparametric detection mode
Target under detection sea clutter background, is mainly used in rejecting sea stationary body (such as oil well, steel tower) interference, but does not prove this
Whether method is effective to small target deteection at a slow speed.In addition the technology is only to the CFAR detection (Constant False Alarm
Rate, abbreviation CFAR) method carried out simulation study, does not carry out actual examination.
Wherein, the two of prior art only theoretically compare both CFAR algorithms pair of K distribution CFAR and ideal CFAR
The power of test of Small object, and simulation study has only been carried out, do not carry out actual verification.
Wherein, the three of prior art need mesh by the dopplerbroadening of echo and size discrimination sea clutter and Small object
Movement velocity faster is indicated, it is limited in one's ability for small target deteection at a slow speed.
Wherein, the four of prior art detect (Moving Targets Detection, abbreviation MTD) and frequency using moving-target
Domain clutter map CFAR process is resisting sea clutter, it is desirable to which detected target is quick motion, is substantially from Doppler Wei Qu
Partial objectives for and clutter, cannot correctly detect for Small object at a slow speed.
Wherein, the five of prior art are being set up in time-frequency domain two-dimensional detection plane base, the average period of the sequence of calculation, root
According to the Weak target under Difference test Sea background of the target with sea clutter average period.The method needs target area long
Time observation, to obtain the prior informations such as sea clutter average period, real-time is not good.
The content of the invention
It is an object of the invention to provide a kind of detecting system of Small object and its detection side at a slow speed under sea clutter background
Method, it is adaptable to which radar disturbs sea clutter background the Dim targets detection of lower microinching in the lower sea-surface target regarding detection.
The application can solve the problem that the microinching Small object problem regarded under radar under detection sea clutter background, using time-frequency domain subregion CFAR
Target echo and sea clutter data are decomposed time-frequency domain two dimensional surface and are processed by treatment technology.Radar system is according to target
With difference of the background return in time domain peacekeeping frequency domain dimension, using corresponding CFAR processing modes, microinching Small object is realized
Detection under sea clutter background.The present invention completes time-frequency subregion CFAR detection algorithms on the basis of time frequency analysis, passes through
Slowly winged helicopter follow-up check under outfield Sea background.
In order to achieve the above object, the present invention is achieved through the following technical solutions：
A kind of detecting system of Small object at a slow speed under sea clutter background, is characterized in, the detecting system is included：
Radar transmit-receive unit, detects and obtains the microinching Small object signal under sea clutter background；
Radar return processing unit, is connected with the radar transmit-receive unit outfan；
Detector unit, is connected with the radar return processing unit outfan.
A kind of detection method of Small object at a slow speed under sea clutter background, is characterized in, the method is comprised the steps of：
S1, radar transmit-receive unit obtains the microinching Small object signal under sea clutter background.
Preferably, step S1 is comprised the steps of：
S1.1, the radar transmit-receive unit detects target using linear FM signal, receives the linear tune of target reflection
Frequency echo-signal.
S2, the radar transmit-receive unit will receive signal send to radar return processing unit carry out process generate radar return
Wave number evidence, and by radar return data is activation to detector unit.
Preferably, step S2 is comprised the steps of：
S2.1, the radar return processing unit receives the linear frequency modulation of the target reflection that the radar transmit-receive unit sends
Echo-signal；
The LFM Echo signal of target reflection and the radar return are processed single by S2.2, the radar return processing unit
Ideal linearity FM signal matched filtering in unit forms the pulse compression radar echo data with peaked shapes.
S3, the detector unit processes continuous multiple radar return data, and sets up corresponding time-frequency domain 2 d plane picture,
The false-alarm targets under zones of different are rejected, the microinching Small object under sea clutter background is obtained.
Preferably, step S3 is comprised the steps of：
S3.1, the detector unit receives continuous multiple pulse compression radars time that the radar return processing unit sends
Wave number evidence.
Multiple pulse compression radar echo datas are carried out quick Fu by S3.2, the detector unit using correlative accumulation technology
In leaf transformation process formation process after radar return data.
S3.3, the detector unit sets up time-frequency domain two dimensional surface；And arrange radar return data after the process
In the time-frequency domain two dimensional surface.
The time-frequency domain two dimensional surface is divided into low-speed detection region, high speed detection area by S3.4, the detector unit
Domain.
Preferably, step S3.4 is comprised the steps of：
S3.4.1, according to radar transmit-receive cell operation repetition rate fN, the detector unit sets the time domain-frequency
Domain two dimensional surface frequency domain scope is 0-fN。
S3.4.2, the detector unit sets the time-frequency domain two dimensional surface frequency domain fibrillar center fc.
S3.4.3, the detector unit sets respectively detection zone border, by the time-frequency domain according to concrete sea situation
Two dimensional surface is divided into low-speed detection region, high speed detection region.
In step S3.4.3, when surveyed marine site is low sea situation, high low speed detection zone border f ＇ are set respectively1、
F ＇2, then detector unit the time-frequency domain two dimensional surface is divided into into low-speed detection region (0-f ＇1), (f ＇2-fN), examine at a high speed
Survey region (f ＇1- f ＇2)；
In step S3.4.3, when surveyed marine site is high sea situation, high low speed detection zone border f ＂ are set respectively1、
F ＂2, then detector unit the time-frequency domain two dimensional surface is divided into into low-speed detection region (0-f ＂1), (f ＂2-fN), examine at a high speed
Survey region (f ＂1- f ＂2)。
S3.5, the detector unit by radar return data after the process carry out respectively low-speed detection region it is one-dimensional away from
From CFAR detection, the one-dimensional speed CFAR detection in high speed detection region, judge concrete in radar return data after the process
Target position in the time-frequency domain two dimensional surface.
Preferably, in step S3.5, radar return data carry out low speed after the detector unit is by the process
During the one-dimensional distance CFAR detection of detection zone, the detector unit is equidistantly divided into the low-speed detection region multiple
Radar return data after the process are divided into M Range resolution unit x by frequency band region, the detector unitk(k=1,
2…M)；
As the resolution cell x that adjusts the distancekWhen being processed, the detector unit is removed and xkThe Range resolution list of adjacent both sides
First xk-1、xk+1；
The detector unit forms two reference unit (x1、x2…xk-1)、(xk+1、xk+2…xM), two are referred to respectively
Unit carries out amplitude read group total:
The detector unit calculates detection threshold A according to formula3：
A3=D0·max(A1,A2)；D0-- the CFAR detection thresholding of detector unit setting；
The detector unit compares A3With A (xk) size, as A (xk) it is more than A3When, judge current detection unit xkFor inspection
Survey target, detection of end；As A (xk) it is less than A3When, judge current detection unit xkNon-detection target, judges thunder after the process
Up to other Range resolution units of echo data, if the detector unit judges the distance point of radar return data after all process
When distinguishing that unit is non-detection target, radar return data after the process are carried out high speed detection region by the detector unit
One-dimensional speed CFAR detection.
Preferably, in step S3.5, radar return data are carried out at a high speed after the detector unit is by the process
During the one-dimensional speed CFAR detection of detection zone, the detector unit is equidistantly divided into the high speed detection region multiple
Time period region, radar return data after the process are divided into S speed resolution cell y by the detector unitk(k=1,
2…S)；
When to speed resolution cell ykWhen being processed, the detector unit is removed and ykThe speed of adjacent both sides is differentiated single
First yk-1、yk+1；
The detector unit forms two reference unit (y1、y2…yk-1)、(yk+1、yk+2…yS), two are referred to respectively
Unit carries out amplitude read group total:
The detector unit calculates detection threshold A according to formula3：
A3=D0·max(A1,A2)；D0-- the CFAR detection thresholding of detector unit setting；
The detector unit compares A3With A (yk) size, as A (yk) it is more than A3When, judge current detection unit ykFor inspection
Survey target, detection of end；As A (yk) it is less than A3When, judge current detection unit ykNon-detection target, judges thunder after the process
Up to other speed resolution cells of echo data, if the detector unit judges the speed point of radar return data after all process
When distinguishing that unit is non-detection target, radar return data after the process are carried out low-speed detection region by the detector unit
One-dimensional distance CFAR detection.
The present invention has compared with prior art advantages below：
The present invention can solve the problem that detection problem of the radar system to microinching object under sea clutter, effectively suppress sea miscellaneous
Ripple false-alarm, improves Dim targets detection probability at a slow speed, expands the range of application of radar system.The invention has been successfully applied to certain type
In number radar system, and pass through the outfield of slower flight Helicopter Target under Sea background with flying checking, can be real with engineering
Existing property.
Description of the drawings
Fig. 1 is a kind of overall flow figure of the detection method of Small object at a slow speed under sea clutter background of the present invention.
Fig. 2 is a kind of one of embodiment schematic diagram of detection method of Small object at a slow speed under sea clutter background of the present invention.
Fig. 3 a are a kind of two of the embodiment schematic diagram of the detection method of Small object at a slow speed under sea clutter background of the present invention.
Fig. 3 b are a kind of three of the embodiment schematic diagram of the detection method of Small object at a slow speed under sea clutter background of the present invention.
Fig. 4 is a kind of four of the embodiment schematic diagram of the detection method of Small object at a slow speed under sea clutter background of the present invention.
Fig. 5 is a kind of five of the embodiment schematic diagram of the detection method of Small object at a slow speed under sea clutter background of the present invention.
Fig. 6 is a kind of six of the embodiment schematic diagram of the detection method of Small object at a slow speed under sea clutter background of the present invention.
Specific embodiment
Below in conjunction with accompanying drawing, by describing a preferably specific embodiment in detail, the present invention is further elaborated.
A kind of detecting system of Small object at a slow speed under sea clutter background, the detecting system is included：For detecting and obtain
The radar transmit-receive unit of the microinching Small object signal under sea clutter background；The radar being connected with radar transmit-receive unit outfan
Echo Processing unit；The detector unit being connected with radar return processing unit outfan.
In the present embodiment, be respectively adopted the data processor of model ADSP-TS201 as radar return processing unit,
Detector unit.
As shown in figure 1, a kind of detection method of Small object at a slow speed under sea clutter background, the method is comprised the steps of：
S1, radar transmit-receive unit obtains the microinching Small object signal under sea clutter background.
Preferably, step S1 is comprised the steps of：
S1.1, radar transmit-receive unit detects target using linear FM signal, and the linear frequency modulation for receiving target reflection is returned
Ripple signal.In the present invention, under radar transmit-receive unit regard detection sea-surface target when, will using broadband emission reception processing technology,
There can be higher time domain resolution capability.Sea clutter area can be effectively reduced, impact of the clutter energy to target detection is reduced.
Width-bandwidth product signal detection target when broadband emission reception processing need to adopt big, typical signal form is linear frequency modulation
(Linear Frequency Modulation, abbreviation LFM) signal.It is broad pulse during transmitting, possesses large energy, improves thunder
Up to Transmit-Receive Unit operating distance.
S2, radar transmit-receive unit will receive signal send to radar return processing unit carry out process generate radar return number
According to, and by radar return data is activation to detector unit.
Preferably, step S2 is comprised the steps of：
S2.1, radar return processing unit receives the LFM Echo signal of the target reflection that radar sends.
The LFM Echo signal of target reflection and the radar return are processed single by S2.2, the radar return processing unit
Ideal linearity FM signal matched filtering in unit forms the pulse compression radar echo data with peaked shapes.
As shown in Fig. 2 radar return processing unit by receive target reflection LFM echo-signals after, by with radar
Preferable LFM Signal Matchings filtering in system, by broad pulse boil down to burst pulse, namely the pulse compression waveform of peaked shapes；
While causing to obtain high resolution range signal, the signal to noise ratio of echo is improve.
S3, the continuous multiple radar return data of detector unit process, and corresponding time-frequency domain 2 d plane picture is set up, reject
False-alarm targets under zones of different, obtain the microinching Small object under sea clutter background.Step S3 is comprised the steps of：
S3.1, detector unit receives continuous multiple pulse compression radar number of echoes that radar return data processing unit sends
According to.
Multiple pulse compression radar echo datas are carried out fast Fourier by S3.2, detector unit using correlative accumulation technology
Radar return data after conversion process formation process.
As shown in Figure 3 a, process of pulse-compression is carried out to continuous Z pulse compression radar echo data, Z spike is obtained
Waveform.After the forward position alignment of multiple pulses by more than, detector unit in units of the time, draws pulse compression radar echo data
Multiple Range resolution units of time period such as it is divided into.The change of Z point quick Fouriers is done to the Z point datas in each Range resolution unit
Process is changed, time-frequency domain two-dimensional detection plane is set up, the correlative accumulation of Z pulse is realized, echo signal to noise ratio is further improved, and
Radar return data after formation process.
S3.3, detector unit sets up time-frequency domain two dimensional surface；And by when radar return data are arranged on this after process
In domain-frequency domain two dimensional surface.
As shown in Figure 3 b, detector unit is arranged on radar return data after process in time-frequency domain two dimensional surface.
Time-frequency domain two dimensional surface is divided into low-speed detection region, high speed detection region by S3.4, detector unit.
Preferably, step S3.4 is comprised the steps of：
S3.4.1, according to radar work repetition rate fN, detector unit setting time-frequency domain two dimensional surface frequency domain scope
For 0-fN。
S3.4.2, detector unit setting time-frequency domain two dimensional surface frequency domain fibrillar center fc.
S3.4.3, detector unit sets respectively detection zone border, by time-frequency domain two dimensional surface according to concrete sea situation
It is divided into low-speed detection region, high speed detection region.
In step S3.4.3, when surveyed marine site is low sea situation, high low speed detection zone border f ＇ are set respectively1, f ＇2, then
The time-frequency domain two dimensional surface is divided into low-speed detection region (0-f ＇ by detector unit1), (f ＇2-fN), high speed detection area
Domain (f ＇1- f ＇2)。
In the present embodiment, under low sea situation, f ＇1=250Hz, f ＇2=3750Hz, fN=4000Hz.Wherein, fNSize with
Radar work repetition rate is relevant, unrelated with specific sea situation.Under low sea situation, f ＇1Close to 0 frequency, f ＇2From fNClosely.
In step S3.4.3, when surveyed marine site is high sea situation, high low speed detection zone border f ＂ are set respectively1、
F ＂2, then detector unit the time-frequency domain two dimensional surface is divided into into low-speed detection region (0-f ＂1), (f ＂2-fN), examine at a high speed
Survey region (f ＂1- f ＂2)。
In the present embodiment, under high sea situation, f ＂1=1250Hz, f ＂2=2750Hz, fN=4000Hz.Wherein, fNSize with
Radar work repetition rate is relevant, unrelated with specific sea situation.Under high sea situation, f ＂1Away from 0 frequency, f ＂2From fNFar.
In the present embodiment, f ＇1, f ＇2, f ＂1, f ＂2Detector unit can be solidificated in after the test of research of radar stage is obtained
In.
As shown in Figure 3 b, time-frequency domain two dimensional surface is divided into low speed with two regions at a high speed by detector unit.According to fast
Fast fourier transform property, divides border centered on frequency domain fibrillar center frequency fc, and both sides are symmetrical, low-speed region in figure
Including (0～f1) and (f2～fN) between region, high-speed region include (f1～f2) between region.
As shown in figure 4, being one embodiment of the present of invention, concrete radar transmit-receive unit receives slow under sea clutter background
Fast moving small target signal, it is concrete in time-frequency domain two dimensional surface Jing after radar return processing unit, detector unit process
Situation.
Radar return data after process are carried out respectively S3.5, detector unit the one-dimensional distance CFAR in low-speed detection region
Detection, the one-dimensional speed CFAR detection in high speed detection region, judge after the process in radar return data objectives when
Position in domain-frequency domain two dimensional surface.
As shown in figure 5, in step S3.5, radar return data carry out low-speed detection region after detector unit is by process
During one-dimensional distance CFAR detection, low-speed detection region is equidistantly divided into multiple frequency band regions by detector unit, and detection is single
Radar return data after process are divided into M Range resolution unit x by unitk(k=1,2 ... M).
M Range resolution unit x in each frequency band regionkWith identical frequency coordinate, different time coordinates.
As the resolution cell x that adjusts the distancekWhen being processed, detector unit is removed and xkThe Range resolution unit of adjacent both sides
xk-1、xk+1。
Detector unit forms two reference unit (x1、x2…xk-1)、(xk+1、xk+2…xM), respectively to two reference units
Carry out amplitude read group total:
Detector unit calculates detection threshold A according to formula3：
A3=D0·max(A1,A2)；D0-- the CFAR detection thresholding of detector unit setting；
Detector unit compares A3With A (xk) size, as A (xk) it is more than A3When, judge current detection unit xkTo detect mesh
Mark, detection of end；As A (xk) it is less than A3When, judge current detection unit xkNon-detection target, radar return number after judgement process
According to other Range resolution units, if to judge that the Range resolution unit of radar return data after all process is non-for detector unit
During detection target, radar return data after process are carried out detector unit the one-dimensional speed CFAR detection in high speed detection region.
In the present invention, M Range resolution unit xkOne and only one or zero Range resolution after after testing unit judges
Unit xkTo detect target.
As shown in fig. 6, in step S3.5, radar return data carry out high speed detection region after detector unit is by process
During one-dimensional speed CFAR detection, high speed detection region is equidistantly divided into multiple time period regions by detector unit, and detection is single
Radar return data after process are divided into S speed resolution cell y by unitk(k=1,2 ... S).
S speed resolution cell y in each region time periodkWith identical time coordinate, different frequency coordinates.
When to speed resolution cell ykWhen being processed, detector unit is removed and ykThe speed resolution cell of adjacent both sides
yk-1、yk+1。
Detector unit forms two reference unit (y1、y2…yk-1)、(yk+1、yk+2…yS), respectively to two reference units
Carry out amplitude read group total:
Detector unit calculates detection threshold A according to formula3：
A3=D0·max(A1,A2)；D0-- the CFAR detection thresholding of detector unit setting；
Detector unit compares A3With A (yk) size, as A (yk) it is more than A3When, judge current detection unit ykTo detect mesh
Mark, detection of end；As A (yk) it is less than A3When, judge current detection unit ykNon-detection target, radar return number after judgement process
According to other speed resolution cells, if to judge that the speed resolution cell of radar return data after all process is non-for detector unit
During detection target, radar return data after process are carried out detector unit the one-dimensional distance CFAR detection in low-speed detection region.
In the present invention, S speed resolution cell ykOne and only one or zero speed are differentiated after after testing unit judges
Unit ykTo detect target.
Although present disclosure has been made to be discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
Various modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (7)
1. a kind of detecting system of Small object at a slow speed under sea clutter background, it is characterised in that the detecting system is included：
Radar transmit-receive unit, detects and obtains the microinching Small object signal under sea clutter background；
Radar return processing unit, is connected with the radar transmit-receive unit outfan；
Detector unit, is connected with the radar return processing unit outfan, the continuous multiple radar return numbers of detector unit process
According to, and corresponding time-frequency domain 2 d plane picture is set up, according to concrete sea situation, detection zone border is set respectively, when will be described
Domain-frequency domain two dimensional surface is divided into low-speed detection region, high speed detection region, and the one-dimensional of low-speed detection region is then carried out respectively
Apart from CFAR detection, the one-dimensional speed CFAR detection in high speed detection region, judge have in radar return data after the process
Body target position in the time-frequency domain two dimensional surface.
2. a kind of detection method of Small object at a slow speed under sea clutter background, it is characterised in that the method is comprised the steps of：
S1, radar transmit-receive unit obtains the microinching Small object signal under sea clutter background；
S2, the radar transmit-receive unit will receive signal send to radar return processing unit carry out process generate radar return number
According to, and by radar return data is activation to detector unit；
S3, the detector unit processes continuous multiple radar return data, and sets up corresponding time-frequency domain 2 d plane picture,
The false-alarm targets under zones of different are rejected, the microinching Small object under sea clutter background is obtained；
Step S3 is comprised the steps of：
S3.1, the detector unit receives continuous multiple pulse compression radar number of echoes that the radar return processing unit sends
According to；
Multiple pulse compression radar echo datas are carried out fast Fourier by S3.2, the detector unit using correlative accumulation technology
Radar return data after conversion process formation process；
S3.3, the detector unit sets up time-frequency domain two dimensional surface；And radar return data after the process are arranged on into this
In time-frequency domain two dimensional surface；
The time-frequency domain two dimensional surface is divided into low-speed detection region, high speed detection region by S3.4, the detector unit；
S3.5, the one-dimensional distance that radar return data after the process are carried out respectively low-speed detection region by the detector unit is permanent
False-alarm detection, the one-dimensional speed CFAR detection in high speed detection region, judge after the process objectives in radar return data
The position in the time-frequency domain two dimensional surface；
Step S3.4 is comprised the steps of：
S3.4.1, according to radar transmit-receive cell operation repetition rate fN, the detector unit sets the time-frequency domain two
Dimensional plane frequency domain scope is 0-fN；
S3.4.2, the detector unit sets the time-frequency domain two dimensional surface frequency domain fibrillar center fc；
S3.4.3, the detector unit sets respectively detection zone border according to concrete sea situation, by time-frequency domain two dimension
Plane is divided into low-speed detection region, high speed detection region.
3. the as claimed in claim 2 detection method of Small object at a slow speed under sea clutter background, it is characterised in that step S1
Comprise the steps of：
S1.1, the radar transmit-receive unit detects target using linear FM signal, and the linear frequency modulation for receiving target reflection is returned
Ripple signal.
4. the as claimed in claim 3 detection method of Small object at a slow speed under sea clutter background, it is characterised in that step S2
Comprise the steps of：
S2.1, the radar return processing unit receives the LFM Echo of the target reflection that the radar transmit-receive unit sends
Signal；
S2.2, the radar return processing unit is by the LFM Echo signal of target reflection and the radar return processing unit
The matched filtering of ideal linearity FM signal formed with peaked shapes pulse compression radar echo data.
5. the as claimed in claim 2 detection method of Small object at a slow speed under sea clutter background, it is characterised in that the step
In S3.4.3, when surveyed marine site is low sea situation, high low speed detection zone border f ＇ are set respectively1, f ＇2, then detector unit is by institute
State time-frequency domain two dimensional surface and be divided into low-speed detection region (0-f ＇1), (f ＇2-fN), high speed detection region (f ＇1- f ＇2)；
In step S3.4.3, when surveyed marine site is high sea situation, high low speed detection zone border f ＂ are set respectively1, f ＂2, then
The time-frequency domain two dimensional surface is divided into low-speed detection region (0-f ＂ by detector unit1), (f ＂2-fN), high speed detection region
(f ＂1- f ＂2)。
6. the as claimed in claim 2 detection method of Small object at a slow speed under sea clutter background, it is characterised in that the step
In S3.5, radar return data carry out the one-dimensional distance CFAR in low-speed detection region after the detector unit is by the process
During detection,
The low-speed detection region is equidistantly divided into multiple frequency band regions by the detector unit, and the detector unit is by institute
State radar return data after process and be divided into M Range resolution unit xk(k=1,2 ... M)；
As the resolution cell x that adjusts the distancekWhen being processed, the detector unit is removed and xkThe Range resolution unit of adjacent both sides
xk-1、xk+1；
The detector unit forms two reference unit (x1、x2…xk-1)、(xk+1、xk+2…xM), respectively to two reference units
Carry out amplitude read group total:
The detector unit calculates detection threshold amplitude A according to formula3：
A3=D0·max(A1,A2)；D0-- the CFAR detection thresholding of detector unit setting；
The detector unit compares A3With A (xk) size, as A (xk) it is more than A3When, judge current detection unit xkTo detect mesh
Mark, detection of end；As A (xk) it is less than A3When, judge current detection unit xkNon-detection target, judges that radar is returned after the process
Other Range resolution units of wave number evidence, if the detector unit judges the Range resolution list of radar return data after all process
When unit is non-detection target, radar return data after the process are carried out the one-dimensional of high speed detection region by the detector unit
Speed CFAR detection.
7. the as claimed in claim 2 detection method of Small object at a slow speed under sea clutter background, it is characterised in that its feature exists
In in step S3.5, radar return data carry out the one of high speed detection region after the detector unit is by the process
During dimension speed CFAR detection,
The high speed detection region is equidistantly divided into multiple time period regions by the detector unit, and the detector unit is by institute
State radar return data after process and be divided into S speed resolution cell yk(k=1,2 ... S)；
When to speed resolution cell ykWhen being processed, the detector unit is removed and ykThe speed resolution cell of adjacent both sides
yk-1、yk+1；
The detector unit forms two reference unit (y1、y2…yk-1)、(yk+1、yk+2…yS), respectively to two reference units
Carry out amplitude read group total:
The detector unit calculates detection threshold amplitude A according to formula3：
A3=D0·max(A1,A2)；D0-- the CFAR detection thresholding of detector unit setting；
The detector unit compares A3With A (yk) size, as A (yk) it is more than A3When, judge current detection unit ykTo detect mesh
Mark, detection of end；As A (yk) it is less than A3When, judge current detection unit ykNon-detection target, judges that radar is returned after the process
Other speed resolution cells of wave number evidence, if the detector unit judges that the speed of radar return data after all process differentiates single
When unit is non-detection target, radar return data after the process are carried out the one-dimensional of low-speed detection region by the detector unit
Apart from CFAR detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410412033.7A CN104215951B (en) | 2014-08-20 | 2014-08-20 | System and method for detecting low-speed small target under sea cluster background |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410412033.7A CN104215951B (en) | 2014-08-20 | 2014-08-20 | System and method for detecting low-speed small target under sea cluster background |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104215951A CN104215951A (en) | 2014-12-17 |
| CN104215951B true CN104215951B (en) | 2017-04-12 |
Family
ID=52097650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410412033.7A Active CN104215951B (en) | 2014-08-20 | 2014-08-20 | System and method for detecting low-speed small target under sea cluster background |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104215951B (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569950B (en) * | 2015-01-27 | 2017-04-19 | 西安电子科技大学 | Sea-surface target clustering method based on relative power and phase linearity |
| CN105022057B (en) * | 2015-06-10 | 2018-02-02 | 西安电子科技大学 | Based on the object detection method for improving Radon conversion and multi-frame joint processing |
| JP6526532B2 (en) * | 2015-09-18 | 2019-06-05 | 古野電気株式会社 | Radar equipment |
| CN107340507B (en) * | 2016-08-04 | 2020-10-02 | 上海无线电设备研究所 | Constant false alarm rate partition detection method |
| CN106569190B (en) * | 2016-10-10 | 2018-12-07 | 华东电子工程研究所（中国电子科技集团公司第三十八研究所） | Sea-surface target detection device and its detection method under a kind of high sea situation |
| CN107678008A (en) * | 2017-09-07 | 2018-02-09 | 西安电子工程研究所 | A kind of plural clutter map CFAR detection method |
| CN108196238B (en) * | 2018-01-12 | 2021-07-27 | 西安电子科技大学 | Clutter map detection method based on adaptive matched filtering under Gaussian background |
| CN110515044A (en) * | 2018-05-22 | 2019-11-29 | 南京锐达思普电子科技有限公司 | Low slow small radar null tone domain four-dimension clutter suppression method |
| CN109358324B (en) * | 2018-10-31 | 2020-07-14 | 安徽四创电子股份有限公司 | Target detection method based on ground monitoring radar spectrum data |
| CN110531332B (en) * | 2019-07-02 | 2023-02-21 | 中国航空工业集团公司雷华电子技术研究所 | Low-altitude slow-speed small target detection method based on segmentation threshold |
| CN110346772A (en) * | 2019-08-22 | 2019-10-18 | 上海无线电设备研究所 | A kind of higher-frequency radar significantly ionosphere phase diameter Disturbance Rejection method |
| CN111610501B (en) * | 2019-12-31 | 2023-05-05 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | Method for detecting small target of sea radar |
| CN113341404A (en) * | 2020-03-02 | 2021-09-03 | 加特兰微电子科技(上海)有限公司 | Constant false alarm detection method and device, integrated circuit and radio device |
| CN111679259B (en) * | 2020-06-18 | 2023-07-14 | 成都纳雷科技有限公司 | Method and system for improving millimeter wave radar moving target detection signal to noise ratio |
| CN112180354B (en) * | 2020-09-29 | 2022-08-16 | 武汉大学 | High-frequency radar target joint detection method utilizing time-frequency analysis and constant false alarm technology |
| CN113189557B (en) * | 2021-04-20 | 2022-05-20 | 中国人民解放军海军航空大学航空作战勤务学院 | Sea radar target detection refinement processing method and device |
| CN113625266A (en) * | 2021-07-20 | 2021-11-09 | 嘉兴聚速电子技术有限公司 | Method, device, storage medium and equipment for detecting low-speed target by using radar |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7286079B2 (en) * | 2005-04-21 | 2007-10-23 | The United States Of America As Represented By The Secretary Of The Navy | Method and apparatus for detecting slow-moving targets in high-resolution sea clutter |
| CN101452075B (en) * | 2008-12-30 | 2011-08-24 | 北京航空航天大学 | At-sea small target detecting method based on average period |
| CN101901352B (en) * | 2010-08-06 | 2012-09-05 | 北京航空航天大学 | Infrared background clutter quantifying method |
-
2014
- 2014-08-20 CN CN201410412033.7A patent/CN104215951B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104215951A (en) | 2014-12-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104215951B (en) | System and method for detecting low-speed small target under sea cluster background | |
| CN104914415B (en) | Single-pulse radar coherent jamming method based on target range profile template matching | |
| Moyer et al. | A multi-dimensional Hough transform-based track-before-detect technique for detecting weak targets in strong clutter backgrounds | |
| CN105093215B (en) | Tracking based on the radar of doppler information to low-altitude low-velocity small targets | |
| CN104898103B (en) | Low velocity target detection method based on multichannel clutter map | |
| JP6699904B2 (en) | Radar device and radar signal processing method thereof | |
| US10802130B2 (en) | Marine target detection in cluttered environments | |
| CN103176187B (en) | A kind of airborne early warning radar ground surface high speed highway goal filtering method | |
| CN109633598A (en) | Array radar object detection method based on signature analysis | |
| CN108693524A (en) | Multiple mobile object matching process based on Modulation Continuous Wave Radar and its system | |
| CN107462873A (en) | A kind of radar chaff method for quickly identifying | |
| CN104714225A (en) | Dynamic programming tracking-before-detection method based on generalized likelihood ratios | |
| KR102275960B1 (en) | System and method for searching radar targets based on deep learning | |
| CN104160296A (en) | A method of target detection | |
| CN104133211A (en) | Target classification identification method for Doppler frequency transformation radar | |
| CN103954939A (en) | Smart-noise-jamming resistant method based on radar networking | |
| JP2017053685A (en) | Radar device and radar signal processing method | |
| CN102540163A (en) | Helicopter classifying and identifying method based on conventional coherent radar | |
| CN104199002B (en) | The radar information processing method of suppression wind-power electricity generation vane false-alarm targets | |
| CN104375139B (en) | Pulse Doppler radar ranging improvement method based on one-dimensional set method | |
| CN105589061A (en) | Signal processing algorithm for shore-based radar | |
| Smith et al. | Methods of associating CODAR SeaSonde vessel detection data into unique tracks | |
| US20110095939A1 (en) | Process and system for determining the position and velocity of an object | |
| CN104391288A (en) | Fitting interferometric phase false alarm removal method | |
| CN113447901B (en) | Sea clutter identification and target detection method independent of probability model |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |