CN108919195A - A kind of alternative optimization search irregular middle repetition PD design method of arteries and veins group - Google Patents
A kind of alternative optimization search irregular middle repetition PD design method of arteries and veins group Download PDFInfo
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- CN108919195A CN108919195A CN201810764677.0A CN201810764677A CN108919195A CN 108919195 A CN108919195 A CN 108919195A CN 201810764677 A CN201810764677 A CN 201810764677A CN 108919195 A CN108919195 A CN 108919195A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- 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
- G01S7/023—Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- 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
- G01S7/28—Details of pulse systems
- G01S7/2813—Means providing a modification of the radiation pattern for cancelling noise, clutter or interfering signals, e.g. side lobe suppression, side lobe blanking, null-steering arrays
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- 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
- G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
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Abstract
The present invention proposes a kind of alternative optimization search irregular middle repetition PD design method of arteries and veins group, according to the design method of " irregular+shake ", using the irregular arteries and veins group design of repetition PD system in the method realization of alternative optimization search, 4 pairs of arteries and veins groups are designed altogether, each pair of arteries and veins group is shaken by the repetition period realizes range ambiguity resolving, it is blind apart from mending to pass through irregular realization between any two, 4 pairs blind using realization speed benefit simultaneously；The method of the present invention is up to principle with the covering of distance-speed, speed mends blind or ambiguity solution flexibility between taking into account range ambiguity resolving in the single sweep operation period and mending the blind, scan period, can emit within an antenna period 4 pairs of arteries and veins groups be completed at the same time range ambiguity resolving/benefit is blind, speed mend it is blind, transmitting 1/2# and 3/4# two can also be recycled between antenna scan period to arteries and veins group, 5/6# and 7/8# two to arteries and veins group, it realizes that range ambiguity resolving and benefit are blind within the monocycle, it is blind to realize that speed is mended during week.
Description
Technical field
The invention belongs to radar system design technical fields, and in particular to middle repetition pulse Doppler radar arteries and veins group is irregular to be set
Meter method.
Background technique
Modern battlefield environment is increasingly sophisticated, and unfriendly target always carries out under active/passive interference or ground and sea clutter shielding
Prominent anti-, complicated background environment often makes radar system both be difficult to effectively screen and extract real goal parameter information, in time
Corresponding threat level is made to enemy's target to differentiate, and easily expends system detection time resource, and task amount and treating capacity is caused to overload.
For ground surveillance radar, clutter recognition is always radar system design and information processing needs emphasis one of to consider the problems of,
Common clutter suppression method has conventional Moveing target indication (Moving Target Indication, MTI), moving-target detection
(Moving Target Detect, MTD) and pulse Doppler (Pulse Doppler, PD) etc..According to《Radar handbook》In
Definition, makes the unambiguous repetition of maximum detectable range be known as low repetition (conventional MTI and MTD radar), makes to detect the maximum speed of target
Spend unambiguous repetition and be known as Gao Zhongying, distance and the fuzzy repetition of speed be known as in repetition, by repetition in use and Gao Chong
The radar of frequency is known as PD radar.
For executing the radar of ground surveillance task, operating distance is all more than hundreds of kilometer, if using the low of routine
Design of pulse repetition, then pulse recurrence frequency (Pulse Repetition Frequency, PRF) is smaller, at this time in Doppler frequency
In range, clutter spectrum will occupy relatively wide range, i.e. Doppler circle of good definition is relatively narrow, and with carrier frequency increase or clutter spectrum exhibition
Width, Doppler circle of good definition reduce, and probability of the target together with clutter spectrum aliasing increases, and reduce target detection performance, therefore,
Low repetition applies in general to weak clutter environment.Gao Zhongying radar can have fast-moving target and clutter in Doppler domain
Effect separation, obtains target speed information, but due to apart from high blur under Gao Zhongying mode, so that target is had at a distance
It is competed with nearby strong clutter, and will lead to using high duty ratio when Gao Zhongying mode and generate biggish obstruction loss apart from upper, needed
Complicated irregular arteries and veins group is designed for obtaining the complete range information of target；Gao Zhongying is generally used for strong clutter environment medium-long range
Detect the target of fast approaching, such as the fire control radar of airborne early warning radar, air to air speed search mode and mode of shooting downward.
Middle repetition has some merits and demerits of low repetition and Gao Zhongying simultaneously, is joined by design arteries and veins group reasonably
Difference, the shortcomings that can be avoided low repetition and Gao Zhongying, while the feature performance benefit both kept, unknown to target conditions, and again
When needing to obtain target range and velocity information in big investigative range simultaneously, middle repetition is optimal selection.About middle repetition PD
Radar Technology, foreign countries have conducted a research and have applied many years ago, representative such as French MASTER series radar, but domestic
It starts late in the research of this aspect, and disclosed technical data is less.In document《Repetition PD in ground based on genetic algorithm
Radar PRF group selection》It proposes using genetic algorithm in (modern radar, 2008,30 (9), pp.33-35) based on M/N criterion
The middle irregular arteries and veins group design method of repetition PD mode, but such method needs N group pulse simultaneously using that could complete detection demand, i.e.,
N group pulse close coupling, seriously limits flexibility and radar data rate, generally using less.Use for reference the design of MASTER radar
Thought, in document《PD working method design in ground radar》(electronic technology and soft project, 2015, pp.120-122) and
《The research of PD working method in three coordinate Surveillance Radar of ground》Centering weight in (Institutes Of Technology Of Nanjing's master thesis, 2013)
Frequency PD Radar operation modes have carried out research and performance evaluation, in document《Irregular jittered dynamic fuzzy distance solution method applied analysis》
Realize that range ambiguity resolving is applied to based on irregular jittered flowing mode in (modern radar, 2011,33 (3), pp.20-23)
Analysis, but these documents do not provide the specific design method of the irregular arteries and veins group of middle repetition PD mode.
Summary of the invention
The present invention proposes a kind of alternative optimization for the urgent need of defect and practical engineering application existing for background technique
The irregular middle repetition PD design method of arteries and veins group is searched for, it is real with every a pair of of shake arteries and veins group according to the design method of " irregular+shake "
Existing range ambiguity resolving, then realize that distance benefit is blind, speed benefit is blind with other several pairs of arteries and veins groups.During a kind of alternative optimization search arteries and veins group is irregular
Repetition PD design method is up to principle with the covering of distance-speed, takes into account range ambiguity resolving and benefit in the single sweep operation period
Speed mends blind or ambiguity solution flexibility between the blind, scan period, designs 4 pairs of arteries and veins groups altogether, and each pair of arteries and veins group is trembled by the repetition period
Dynamic to realize range ambiguity resolving, realization between any two is blind apart from mending, and 4 pairs blind using realization speed benefit simultaneously, i.e. 1/2# and 3/4# arteries and veins
Group simultaneously using realize range ambiguity resolving and apart from mending it is blind, 5/6# and 7/8# arteries and veins group is simultaneously using realization range ambiguity resolving and distance
Mend it is blind, 4 pairs of arteries and veins groups simultaneously using realize range ambiguity resolving, distance mend blind and speed mend it is blind.The design method can be according to radar
Data rate request flexibly uses 4 pairs of arteries and veins groups, if radar time resource allows, can emit simultaneously within an antenna period
4 pairs of arteries and veins groups, be completed at the same time range ambiguity resolving/benefit is blind, speed mend it is blind, can be in antenna scanning if data rate request is higher
Circulation transmitting 1/2# and 3/4#, 5/6# and 7/8# two realize that range ambiguity resolving and benefit are blind to arteries and veins group within the monocycle during week,
It is blind to realize that speed is mended during week.
A kind of alternative optimization search irregular middle repetition PD design method of arteries and veins group specifically includes following steps：
Step 1：Set basic parameter；
If middle repetition PD mode radar detection maximum distance is Rmax, maximum target speed is Vmax, according to range ambiguity time
Number NambRepetition PD mode pulse repetition rate variation range is PRF ∈ [PRF in settingmin,PRFmax], then pulse repetition period
Value range is PRI ∈ [PRImin,PRImax], wherein PRImin=1/PRFmax, PRImax=1/PRFmin, Average pulse repeating interval is
PRIave=(PRImin+PRImax)/2；If radar emission average duty ratio is Dave, maximum duty cycle Dmax, then transmitting can be calculated
Pulse width is τ=min (PRIaveDave,PRIminDmax), wherein min () is minimizing operation；If radar sampling rate is Fs, then one
A distance unit is Δ R=C/ (2Fs), wherein C is the light velocity, if a pair of of arteries and veins group repetition interval amount of jitter is NjitA distance unit
Corresponding time, i.e. arteries and veins group repetition interval amount of jitterWhereinFor the operation that rounds up.
Step 2：Coherent pulse number and Doppler filter group in arteries and veins group is calculated to design；
It after determining pulsewidth, is required to determine coherent pulse number in arteries and veins group according to radar range, when increase coherent arteries and veins
When rushing number makes the covering of radar power be able to satisfy operating distance requirement, using pulse number at this time as coherent pulse number in arteries and veins group；
After determining coherent pulse number, using digital synthesis Doppler filter group design method, according to the clutter spectrum width of setting and
Filter minor level carries out Doppler filter design by channel；After Design of filter banks, it is with normalized response -3dB
Thresholding, calculating single group filter group normalized frequency coverage area are ρvis。
Step 3：Calculate first pair of shake arteries and veins group repetition interval；
According to radar range Rmax, it is contemplated that range ambiguity resolving surplus takes the corresponding distance R of a pulse widthmin
τ/2=C, with distance (Rmax+Rmin) calculate distance it is not fuzzy when corresponding minimum repetition period be PRIna=2 (Rmax+Rmin)/C,
According to the range ambiguity times N of settingamb, take first arteries and veins group repetition interval to beThen first pair
2# arteries and veins group repetition interval is PRI2=PRI1+Tjit。
Step 4：Calculate second pair of arteries and veins group repetition interval；
After first pair of arteries and veins group repetition interval determines, in [PRImin,PRImax] the interior search 3# arteries and veins group repetition interval of range
PRI3, the criterion of search is, first pair of arteries and veins group and second pair of arteries and veins group simultaneously in use, under the conditions of maximum apart from coverage rate,
Make first pair of arteries and veins group and second couple of maximum repetition period PRI of arteries and veins group speed coverage rate3, then corresponding to 4# arteries and veins group repetition interval is
PRI4=PRI3+Tjit；Quantization R is carried out with distance unit Δ R range of adjusting the distancet∈[0,Rmax+Rmin], distance unit sum isWith the minimum speed interval delta V of setting to velocity interval Vt∈[0,Vmax] quantified,
Speed unit sum isFor any one repetition period PRIiIf PRFi=1/PRIi, for each
Distance unit Rt, it is mod (2R apart from coverage conditiont/C,PRIi) > τ, wherein mod () expression takes the remainder operation, for each
Speed unit Vt, speed coverage condition is | mod (2Vt/λ,PRFi)/PRFi- 0.5 | < ρvis/ 2, wherein λ is wavelength, if distance
Capping unit number is NR_C, speed capping unit number is NV_C, then repetition period PRIiApart from coverage rate be NR_C/NR_All,
Speed coverage rate is NV_C/NV_All。
Step 5：Calculate third to and the 4th pair of arteries and veins group repetition interval；
After the repetition period that first pair of 1/2# and second pair of 3/4# arteries and veins group has been determined, third is to 5/6# and the 4th couple of 7/8#
The selection principle of arteries and veins group repetition interval is, third to and the 4th pair of repetition period independently use when distance covering it is maximum, and the
Three pairs and the 4th pair of repetition period velocity coverage rate make four pairs of repetition periodic distances-speed covering maximum when meeting setting value；If
5# arteries and veins group and 7# arteries and veins group repetition interval are respectively PRI5And PRI7, corresponding 6# arteries and veins group and 8# arteries and veins group repetition interval are respectively PRI6=
PRI5+TjitAnd PRI8=PRI7+Tjit, for any one repetition period PRIiIf PRFi=1/PRIi, for each distance unit
RtWith speed unit Vt, distance-speed coverage condition is mod (2Rt/C,PRIi) > τ and | mod (2Vt/λ,PRFi)/PRFi-0.5
| < ρvis/ 2, if distance-speed capping unit number is NRV_C, then repetition period PRIiDistance-speed coverage rate be NRV_C/
(NR_AllNV_All)；Defining Optimizing Search function is：
Wherein γRVFor four pairs of arteries and veins group distance-speed coverage rates, mean (PRI1-8) it is four pairs of arteries and veins group repetition interval mean values, α
For weighting coefficient；If four pairs of arteries and veins group distance-speed coverage rate minimum thresholds are β1, third to and the 4th pair of arteries and veins group speed coverage rate
Minimum threshold is β2, meeting thresholding β1And β2In the range of the corresponding result of Optimizing Search function maxima be PRI5With
PRI7。
Step 6：The correctness that the irregular arteries and veins group parameter of repetition PD is chosen in verifying；
Distance range R is calculated with four pairs of arteries and veins group repetition intervals of searcht∈[0,Rmax+Rmin] and velocity interval Vt∈[0,
Vmax] in each unit whether meet distance-speed covering, draw distance-velocity overlays verify in the irregular arteries and veins group weight of repetition PD
The correctness that the multiple period is chosen.
Detailed description of the invention
Fig. 1 is a kind of alternative optimization search irregular middle repetition PD design method design flow diagram of arteries and veins group of the present invention.
Fig. 2 is radar coverage figure when determining arteries and veins intra class correlation pulse number in the specific embodiment of the invention.
Fig. 3 is the Doppler filter group frequency response chart designed in the specific embodiment of the invention.
Fig. 4 is distance and speed coverage rate when searching for second pair of arteries and veins group repetition interval in the specific embodiment of the invention.
Fig. 5 be in the specific embodiment of the invention search for third to and the 4th pair of arteries and veins group repetition interval apart from coverage rate.
Fig. 6 be searched in the specific embodiment of the invention third to and when the 4th pair of arteries and veins group repetition interval four to arteries and veins group distance-
Speed coverage rate.
Fig. 7 be in the specific embodiment of the invention search for third to and the 4th pair of arteries and veins group repetition interval speed coverage rate.
Fig. 8 is the distance-speed coverage rate for meeting search setting thresholding in the specific embodiment of the invention.
Fig. 9 is four pairs of preferred arteries and veins group distance-velocity overlays in the specific embodiment of the invention.
Specific embodiment
A kind of alternative optimization of the present invention search irregular middle repetition PD design method design cycle of arteries and veins group as shown in Figure 1,
In conjunction with flow chart and embodiment, the embodiment of the method for the present invention is specifically addressed, process is as follows：
Step 1：Set basic parameter；
If middle repetition PD mode radar detection maximum distance is Rmax, maximum target speed is Vmax, according to range ambiguity time
Number NambRepetition PD mode pulse repetition rate variation range is PRF ∈ [PRF in settingmin,PRFmax], then pulse repetition period
Value range is PRI ∈ [PRImin,PRImax], wherein PRImin=1/PRFmax, PRImax=1/PRFmin, Average pulse repeating interval is
PRIave=(PRImin+PRImax)/2；If radar emission average duty ratio is Dave, maximum duty cycle Dmax, then transmitting can be calculated
Pulse width is τ=min (PRIaveDave,PRIminDmax), wherein min () is minimizing operation；If radar sampling rate is Fs, then one
A distance unit is Δ R=C/ (2Fs), wherein C is the light velocity, if a pair of of arteries and veins group repetition interval amount of jitter is NjitA distance unit
Corresponding time, i.e. arteries and veins group repetition interval amount of jitter Tjit=2NjitΔ R/C=[Njit/Fs], whereinFor the fortune that rounds up
It calculates.
Middle repetition mode radar maximum detectable range is set in the present embodiment as Rmax=60km, maximum target speed are Vmax=
1000m/s, if range ambiguity number is Namb=3, pulse recurrence frequency variation range is PRF ∈ [5kHz, 10kHz], then pulse
Repetition period value range is PRI ∈ [100us, 200us], Average pulse repeating interval PRIave=150us；If radar emission is flat
Equal duty ratio is Dave=10%, maximum duty cycle Dmax=15%, then fire pulse width is τ=15us；If radar sampling
Rate is Fs=2MHz, a pair of of arteries and veins group repetition interval amount of jitter are Njit=4 distance unit, corresponding shaky time Tjit=Njit/
Fs=2us.
Step 2：Coherent pulse number and Doppler filter group in arteries and veins group is calculated to design；
It after determining pulsewidth, is required to determine coherent pulse number in arteries and veins group according to radar range, when increase coherent arteries and veins
When rushing number makes the covering of radar power be able to satisfy operating distance requirement, using pulse number at this time as coherent pulse number in arteries and veins group.
The repetition PD search in the use of 0 °, 3 ° and 6 ° of low latitude, draws radar coverage-diagram according to radar system parameters, works as arteries and veins in the present embodiment
Coherent pulse number is N in grouppulseWhen=15, operating distance requirement can satisfy, as shown in Figure 2.
After determining coherent pulse number, using digital synthesis Doppler filter group design method, according to the miscellaneous of setting
Wave spectrum is wide and filter minor level is by channel progress Doppler filter design；After Design of filter banks, to normalize sound
Answering -3dB is thresholding, and calculating single group filter group normalized frequency coverage area is ρvis.The 15 ranks filtering designed in the present embodiment
Device group is as shown in figure 3, single group filter group normalized frequency coverage area is ρvis=76%.
Step 3：Calculate first pair of shake arteries and veins group repetition interval；
According to radar range Rmax, it is contemplated that range ambiguity resolving surplus takes the corresponding distance R of a pulse widthmin
τ/2=C, with distance (Rmax+Rmin) calculate distance it is not fuzzy when corresponding minimum repetition period be PRIna=2 (Rmax+Rmin)/C,
According to the range ambiguity times N of settingamb, take first arteries and veins group repetition interval to beThen first pair
2# arteries and veins group repetition interval is PRI2=PRI1+Tjit。
According to the parameter set in step 1, can be calculated first arteries and veins group repetition interval is the present embodimentFirst pair of 2# arteries and veins group repetition interval is PRI2=141us.
Step 4：Calculate second pair of arteries and veins group repetition interval；
After first pair of arteries and veins group repetition interval determines, in [PRImin,PRImax] the interior search 3# arteries and veins group repetition interval of range
PRI3, the criterion of search is, first pair of arteries and veins group and second pair of arteries and veins group simultaneously in use, under the conditions of maximum apart from coverage rate,
Make first pair of arteries and veins group and second couple of maximum repetition period PRI of arteries and veins group speed coverage rate3, then corresponding to 4# arteries and veins group repetition interval is
PRI4=PRI3+Tjit；Quantization R is carried out with distance unit Δ R range of adjusting the distancet∈[0,Rmax+Rmin], distance unit sum isWith the minimum speed interval delta V of setting to velocity interval Vt∈[0,Vmax] quantified,
Speed unit sum isFor any one repetition period PRIiIf PRFi=1/PRIi, for each
Distance unit Rt, it is mod (2R apart from coverage conditiont/C,PRIi) > τ, wherein mod () expression takes the remainder operation, for each
Speed unit Vt, speed coverage condition is | mod (2Vt/λ,PRFi)/PRFi- 0.5 | < ρvis/ 2, wherein λ is wavelength, if distance
Capping unit number is NR_C, speed capping unit number is NV_C, then repetition period PRIiApart from coverage rate be NR_C/NR_All,
Speed coverage rate is NV_C/NV_All。
3# arteries and veins group repetition interval PRI is searched in the present embodiment in PRI ∈ [100us, 200us] range3, draw distance and cover
Lid rate curve and speed coverage rate curve select speed coverage rate most as shown in figure 4, under the premise of meeting apart from coverage rate maximum
The big repetition period is as PRI3, it can be seen from the figure that in the maximum section of coverage rate, speed covering maximum value is
92.04%, the corresponding repetition period is 164us, therefore takes PRI3=164us, corresponding 4# arteries and veins group repetition interval are PRI4=
166us。
Step 5：Calculate third to and the 4th pair of arteries and veins group repetition interval；
After the repetition period that first pair of 1/2# and second pair of 3/4# arteries and veins group has been determined, third is to 5/6# and the 4th couple of 7/8#
The selection principle of arteries and veins group repetition interval is, third to and the 4th pair of repetition period independently use when distance covering it is maximum, and the
Three pairs and the 4th pair of repetition period velocity coverage rate make four pairs of repetition periodic distances-speed covering maximum when meeting setting value；If
5# arteries and veins group and 7# arteries and veins group repetition interval are respectively PRI5And PRI7, corresponding 6# arteries and veins group and 8# arteries and veins group repetition interval are respectively PRI6=
PRI5+TjitAnd PRI8=PRI7+Tjit, for any one repetition period PRIiIf PRFi=1/PRIi, for each distance unit
RtWith speed unit Vt, distance-speed coverage condition is mod (2Rt/C,PRIi) > τ and | mod (2Vt/λ,PRFi)/PRFi-0.5
| < ρvis/ 2, if distance-speed capping unit number is NRV_C, then repetition period PRIiDistance-speed coverage rate be NRV_C/
(NR_AllNV_All)；Defining Optimizing Search function is
Wherein γRVFor four pairs of arteries and veins group distance-speed coverage rates, mean (PRI1-8) it is four pairs of arteries and veins group repetition interval mean values, α
For weighting coefficient；If four pairs of arteries and veins group distance-speed coverage rate minimum thresholds are β1, third to and the 4th pair of arteries and veins group speed coverage rate
Minimum threshold is β2, meeting thresholding β1And β2In the range of the corresponding result of Optimizing Search function maxima be PRI5With
PRI7。
The present embodiment searches for 5# arteries and veins group and 7# arteries and veins group repetition interval PRI within the scope of 100-200us5And PRI7, third to
4th pair of arteries and veins group repetition interval is apart from coverage rate as shown in figure 5, four pairs of arteries and veins group repetition interval distance-speed coverage rate such as Fig. 6 institutes
Show, third to and the 4th pair of arteries and veins group repetition interval speed coverage rate it is as shown in Figure 7.
Third to and the 4th pair of repetition periodic distance coverage rate it is maximum under the conditions of, if four pairs of arteries and veins group distance-speed are covered
Lid rate minimum threshold is β1=94.5%, third to and the 4th pair of arteries and veins group speed coverage rate minimum threshold be β2=91%, meet door
Limit β1And β2Distance-speed coverage rate as shown in figure 8, meeting thresholding β1And β2In the range of Optimizing Search function maxima
For fmax=0.9531, corresponding search result is PRI5=125us and PRI7=177us, corresponding PRI6=127us and PRI8=
179us。
Step 6：The correctness that the irregular arteries and veins group parameter of repetition PD is chosen in verifying；
Distance range R is calculated with four pairs of arteries and veins group repetition intervals of searcht∈[0,Rmax+Rmin] and velocity interval Vt∈[0,
Vmax] in each unit whether meet distance-speed covering, draw distance-velocity overlays verify in the irregular arteries and veins group weight of repetition PD
The correctness that the multiple period is chosen.
The present embodiment four is selected as 139/141us, 164/166us, 125/127us and 177/ to arteries and veins group repetition interval
When 179us, distance-velocity overlays are drawn, as shown in figure 9, white area indicates that the distance and speed can cover in figure, it is black
Color region is distance-velocity shadow；Distance-speed coverage rate in 0-62.25km distance range, 0-1000m/s velocity interval
It is 94.70%, four pairs of arteries and veins group repetition interval average values are 152us, and average duty ratio 9.85% meets design requirement.
Claims (1)
1. a kind of alternative optimization searches for the irregular middle repetition PD design method of arteries and veins group, it is characterised in that：
Step 1：Set basic parameter；
If middle repetition PD mode radar detection maximum distance is Rmax, maximum target speed is Vmax, according to range ambiguity times Namb
Repetition PD mode pulse repetition rate variation range is PRF ∈ [PRF in settingmin,PRFmax], then pulse repetition period value model
It encloses for PRI ∈ [PRImin,PRImax], wherein PRImin=1/PRFmax, PRImax=1/PRFmin, Average pulse repeating interval PRIave
=(PRImin+PRImax)/2；If radar emission average duty ratio is Dave, maximum duty cycle Dmax, then transmitting pulse can be calculated
Width is τ=min (PRIaveDave,PRIminDmax), wherein min () is minimizing operation；If radar sampling rate is Fs, then one away from
It is Δ R=C/ (2F from units), wherein C is the light velocity, if a pair of of arteries and veins group repetition interval amount of jitter is NjitA distance unit is corresponding
Time, i.e. arteries and veins group repetition interval amount of jitterWhereinFor the operation that rounds up；
Step 2：Coherent pulse number and Doppler filter group in arteries and veins group is calculated to design；
After determining pulsewidth, required to determine coherent pulse number in arteries and veins group according to radar range, it is a when increasing coherent pulse
When number makes the covering of radar power be able to satisfy operating distance requirement, using pulse number at this time as coherent pulse number in arteries and veins group；When true
After determining coherent pulse number, using digital synthesis Doppler filter group design method, according to the clutter spectrum width of setting and filtering
Device minor level carries out Doppler filter design by channel；After Design of filter banks, using normalized response -3dB as thresholding,
Calculating single group filter group normalized frequency coverage area is ρvis；
Step 3：Calculate first pair of shake arteries and veins group repetition interval；
According to radar range Rmax, it is contemplated that range ambiguity resolving surplus takes the corresponding distance R of a pulse widthmin=C τ/
2, with distance (Rmax+Rmin) calculate distance it is not fuzzy when corresponding minimum repetition period be PRIna=2 (Rmax+Rmin)/C, according to
The range ambiguity times N of settingamb, take first arteries and veins group repetition interval to beThen first pair of 2# arteries and veins
Group repetition interval is PRI2=PRI1+Tjit；
Step 4：Calculate second pair of arteries and veins group repetition interval；
After first pair of arteries and veins group repetition interval determines, in [PRImin, PRImax] the interior search 3# arteries and veins group repetition interval PRI of range3, search
The criterion of rope is that first pair of arteries and veins group and second pair of arteries and veins group make first pair simultaneously in use, under the conditions of maximum apart from coverage rate
Arteries and veins group and second pair of arteries and veins group speed coverage rate maximum repetition period are PRI3, then corresponding to 4# arteries and veins group repetition interval is PRI4=
PRI3+Tjit；Quantization R is carried out with distance unit Δ R range of adjusting the distancet∈[0,Rmax+Rmin], distance unit sum isWith the minimum speed interval delta V of setting to velocity interval Vt∈[0,Vmax] quantified,
Speed unit sum isFor any one repetition period PRIiIf PRFi=1/PRIi, for each
Distance unit Rt, it is mod (2R apart from coverage conditiont/C,PRIi) > τ, wherein mod () expression takes the remainder operation, for each
Speed unit Vt, speed coverage condition is | mod (2Vt/λ,PRFi)/PRFi- 0.5 | < ρvis/ 2, wherein λ is wavelength, if distance
Capping unit number is NR_C, speed capping unit number is NV_C, then repetition period PRIiApart from coverage rate be NR_C/NR_All,
Speed coverage rate is NV_C/NV_All；
Step 5：Calculate third to and the 4th pair of arteries and veins group repetition interval；
After the repetition period that first pair of 1/2# and second pair of 3/4# arteries and veins group has been determined, third is to 5/6# and the 4th pair of 7/8# arteries and veins group
The selection principle of repetition period is, third to and the 4th pair of repetition period independently use when distance covering it is maximum, and in third pair
Make four pairs of repetition periodic distances-speed covering maximum when meeting setting value with the 4th pair of repetition period velocity coverage rate；If 5# arteries and veins
Group and 7# arteries and veins group repetition interval are respectively PRI5And PRI7, corresponding 6# arteries and veins group and 8# arteries and veins group repetition interval are respectively PRI6=PRI5+
TjitAnd PRI8=PRI7+Tjit, for any one repetition period PRIiIf PRFi=1/PRIi, for each distance unit RtWith
Speed unit Vt, distance-speed coverage condition is mod (2Rt/C,PRIi) > τ and | mod (2Vt/λ,PRFi)/PRFi- 0.5 | <
ρvis/ 2, if distance-speed capping unit number is NRV_C, then repetition period PRIiDistance-speed coverage rate be NRV_C/
(NR_AllNV_All)；Defining Optimizing Search function is：
Wherein γRVFor four pairs of arteries and veins group distance-speed coverage rates, mean (PRI1-8) it is four pairs of arteries and veins group repetition interval mean values, α is to add
Weight coefficient；If four pairs of arteries and veins group distance-speed coverage rate minimum thresholds are β1, third to and the 4th pair of arteries and veins group speed coverage rate it is minimum
Thresholding is β2, meeting thresholding β1And β2In the range of the corresponding result of Optimizing Search function maxima be PRI5And PRI7；
Step 6：The correctness that the irregular arteries and veins group parameter of repetition PD is chosen in verifying；
Distance range R is calculated with four pairs of arteries and veins group repetition intervals of searcht∈[0,Rmax+Rmin] and velocity interval Vt∈[0,Vmax] in
Whether each unit meets the covering of distance-speed, draws the irregular arteries and veins group repetition interval of repetition PD in the verifying of distance-velocity overlays
The correctness of selection.
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