CN106908772B - The method of regional area signal is extracted from radar echo signal - Google Patents
The method of regional area signal is extracted from radar echo signal Download PDFInfo
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- CN106908772B CN106908772B CN201710128862.6A CN201710128862A CN106908772B CN 106908772 B CN106908772 B CN 106908772B CN 201710128862 A CN201710128862 A CN 201710128862A CN 106908772 B CN106908772 B CN 106908772B
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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
- G01S7/285—Receivers
- G01S7/292—Extracting wanted echo-signals
- G01S7/2923—Extracting wanted echo-signals based on data belonging to a number of consecutive radar periods
Abstract
The method that the invention discloses a kind of to extract regional area signal from radar echo signal, comprising the following steps: (1), by radar echo signal shown in PPI display interface；(2), the fan ring-type frame comprising Region Of Interest is drawn；(3), the angle between two straight flanges and the longitudinal axis of rectangular coordinate system of fanning cyclic annular frame is calculated, two arc sides for fanning cyclic annular frame is calculated and PPI shows the distance between origin；(4), the actual range boundary in real space is calculatedWith；(5), the appearance position apart from boundary in echo-signal each pulse repetition period is calculatedWith；(6), angle is found out to be located atWithBetween pulse repetition period acquisition data, take out in the channel I and the channel Q come respectivelyWithBetween data.The method of extraction regional area signal of the invention, can be convenient the region for efficiently finding and being concerned about where data, and accurately extract required data, will not lose useful data or introduce redundant data, and data extraction operation is simple, calculation amount is small.
Description
Technical field
The present invention relates to Radar Signal Processing Technology fields, specifically, being to be related to one kind extraction office from radar return
The method of portion's regional signal.
Background technique
In Radar Signal Processing and data processing field, it is often necessary to the video acquisition number after receiver orthogonal detection
According to being handled and being analyzed, with the reasonable signal/data processing algorithm that studies science, radar is improved to the detection performance of target.
Obviously, not all radar echo signal requires to be handled, and valuable echo-signal exists only in regional area
In, it is therefore desirable to the echo of region-of-interest is extracted from complete radar return using the method for science.At present from complete radar
The general following two method of method of region-of-interest echo is extracted in echo:
1, from radar playback video in search Region Of Interest, record Region Of Interest distance and angle it is respective starting,
The estimated value of termination originates to guarantee to acquire complete data and the tolerance of stop value is generally all very big.Then, according to number
According to frequency acquisition and pulse repetition period calculate the area data echo record file in position.Finally by the number of regions
File is independently formed according to extracting from original document.
2, according to the geographical location of region-of-interest and radar geographical coordinate, estimate region-of-interest center and distance/
Then angular range estimates the distance and the respective starting of angle and stop value, subsequent step and the 1st kind of method phase of Region Of Interest
Together.
Both the above mode can extract the echo data of regional area from complete radar return data, still
It has the following problems:
Extract the angle starting stop value in region, distance starting stop value can only all estimate that estimated value tolerance is too small easy
Raw useful data are lost, the excessive then hash of tolerance is too many, increases subsequent processing workload, and may produce to useful data
Raw interference.
In 2nd kind of method, often take one piece of region data will zoning range, calculate complicated, heavy workload.
Summary of the invention
The present invention mainly uses estimation to solve the existing method for extracting regional area signal from radar echo signal
Mode, the bad control of tolerance size, or the technical issues of calculate complicated, heavy workload, propose a kind of from radar return
The method that regional area signal is extracted in signal, can solve the above problem.
In order to solve the above-mentioned technical problem, the present invention is achieved by the following scheme:
A method of extracting regional area signal from radar echo signal, which comprises the following steps:
(1), rectangular coordinates transformation will be carried out with the radar echo signal that distance and angle indicate under polar coordinates, and calculated
It is shown on machine screen coordinate with PPI picture Show Styles；
(2), it is drawn in the PPI picture and fans cyclic annular frame, Region Of Interest is included in the cyclic annular frame of the fan, institute
The extended line for stating two straight flanges of the cyclic annular frame of fan passes through the origin of screen rectangular coordinate system in PPI picture, the fan ring respectively
The two other side of shape frame is using the origin of screen rectangular coordinate system in PPI picture as the center of circle, arc radius different two
Circular arc；
(3), it calculates in two straight flanges and PPI picture for fanning cyclic annular frame between the longitudinal axis of screen rectangular coordinate system
Angle, respectively θ 1 and θ 2, calculate the distance between two arc sides for fanning cyclic annular frame and described origin, respectively R1 with
R2, wherein the unit of R1 and R2 is pixel number；
(4), R1 and R2 actual range ρ 1 and ρ 2 corresponding in real space are calculated；
(5), calculating the actual range away from radar respectively is that the echo-signal at the position of ρ 1 and ρ 2 is repeated in each pulse
The Position Number N1 and N2 in period；
(6), all from pulse repetition of the angle between θ 1 and θ 2 is found out in the raw data file of radar echo signal
The acquisition data of phase are taken out position in the channel I and the channel Q respectively and are compiled in the acquisition data for the pulse repetition period found
Data number between N1 and N2, wherein in any pulse repetition period, the Position Number for acquiring data is suitable according to natural number
Sequence is sequentially arranged.
Further, in step (3), the calculation method of θ 1 and θ 2 are as follows:
The calculation method of R1 and R2 are as follows:
Wherein, (X0,Y0) be in PPI picture screen rectangular coordinate system origin, (x1,y1) it is that the fan is cyclic annular
The coordinate of the wherein wherein end point of a straight flange of frame, (x2,y2)、(x3,y3) be respectively the cyclic annular frame of the fan in addition
The coordinate of the two-end-point of one straight flange, and (X0,Y0) it is it is known that (x1,y1)、(x2,y2)、(x3,y3) can be obtained by cursor position
?.
Further, in step (4), the calculation method of ρ 1 and ρ 2 are as follows:
Wherein, R is the display radius in PPI picture, and D is the display range in PPI picture, and the unit of R and D are pixel
Number.
Further, in step (5), the calculation method of Position Number N1 and N2 are as follows:
Wherein,It is accorded with for downward rounding operation,For the operator that rounds up, c is the light velocity, fsFor radar echo signal
Frequency acquisition.
Further, in step (1), method that radar echo signal is shown in the PPI picture are as follows:
Radar signal includes the channel I and the channel Q, each group of radar echo signal include echo angle value, the channel I not
Reception data in the same time, the channel Q different moments reception data, wherein echo angle value is θnWhen, the channel I and the channel Q
I-th of reception data be respectively IiAnd Qi, coordinate (x of this in rectangular coordinate systemin,yin) are as follows:
Wherein, R is the display radius in PPI picture, and D is the display range in PPI picture, and the unit of R and D are pixel
Number, c is the light velocity, fsFor the frequency acquisition of radar echo signal, i is natural number.
Compared with prior art, the advantages and positive effects of the present invention are: of the invention extract from radar echo signal
The method of regional area signal is concerned about area by defining fan-shaped edge and accurately determining first on radar PPI data readback picture
The range in domain, then position of the anti-data for pushing away selection region in original document, can be convenient and efficiently find care number
According to the region at place, and required data are accurately extracted, will not cause to lose useful data or introduces redundant data, and
Data extraction operation is simple, and calculation amount is small.
After the detailed description of embodiment of the present invention is read in conjunction with the figure, the other features and advantages of the invention will become more
Add clear.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is method a kind of embodiment proposed by the invention that regional area signal is extracted from radar echo signal
Flow chart；
Fig. 2 is proposed by the invention from a kind of embodiment of method for extracting regional area signal in radar echo signal
Radar acquires data format schematic diagram；
Fig. 3 is proposed by the invention from a kind of embodiment of method for extracting regional area signal in radar echo signal
It is drawn in image shown by radar echo signal and fans cyclic annular frame schematic diagram；
Fig. 4 is schematic diagram of Fig. 3 middle fan ring-type frame in PPI display interface.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment one, the present embodiment propose a kind of method that regional area signal is extracted from radar echo signal, packet
Include following steps:
S1, rectangular coordinates transformation will be carried out with the radar echo signal that distance and angle indicate under polar coordinates, and calculated
It is shown on machine screen coordinate with PPI picture Show Styles；As shown in Figure 1, for radar acquisition in a pulse repetition period
Data format, including at least echo angle value, the channel I the reception data of different moments, the channel Q different moments reception
Data, receives echo-signal at the time of, have directly reacted barrier length at a distance from radar.
S2, cyclic annular frame is fanned as shown in Fig. 2, drawing in PPI picture, Region Of Interest is included in and is fanned in cyclic annular frame,
The extended line for fanning two straight flanges of cyclic annular frame passes through the origin of screen rectangular coordinate system in PPI picture respectively, and the fan is cyclic annular
The two other side of frame is using the origin of screen rectangular coordinate system in PPI picture as the center of circle, different two circles of arc radius
Arc；Due to being shown radar echo signal in PPI picture in step S1, user can intuitively observe radar map
Picture can be irised out, it is desirable to be able to by the radar return data sheet in region during observation using partial region as Region Of Interest
It solely extracting, since user is by the way of range estimation, it is only necessary to user directly irises out Region Of Interest in PPI display interface,
It is user-friendly, by the working principle of radar and its storage form of data it is found that radar carries out sector scan, for convenience
Calculating, the frame for enclosing Region Of Interest of the drafting preferably cyclic annular frame of fan, and two straight flanges of the cyclic annular frame of fan prolong
Long line passes through the origin of rectangular co-ordinate respectively, calculates Region Of Interest in the initial data of radar echo signal in this way, facilitating
Position.
S3, calculating fan the angle in two straight flanges and PPI picture of cyclic annular frame between the longitudinal axis of screen rectangular coordinate system,
Respectively θ 1 and θ 2 calculates the distance between two arc sides for fanning cyclic annular frame and origin, respectively R1 and R2, wherein R1 with
The unit of R2 is pixel number；As shown in figure 3, being schematic diagram of the step S2 middle fan ring-type frame in PPI display interface.
S4, R1 and R2 actual range ρ 1 and ρ 2 corresponding in real space are calculated；Since R1 and R2 is in PPI picture
Length in screen rectangular coordinate system, unit is pixel number, corresponding in real space therefore, it is necessary to calculate the length
Actual range.
The actual range away from radar is that the echo-signal at the position of ρ 1 and ρ 2 repeats week in each pulse respectively for S5, calculating
The Position Number N1 and N2 of phase；It is previously noted that directly having reacted the distance of barrier and radar at the time of receives echo-signal
It is short, and there is direct relation with the position in radar return data, therefore according between three at the time of receives echo-signal
Relationship, echo-signal can be calculated in the appearance position N1 and N2 of each pulse repetition period, wherein any pulse repeats
In period, the Position Number for acquiring data is sequentially arranged according to natural number sequence namely N1 and N2 is natural number.
S6, from finding out pulse repetition period of the angle between θ 1 and θ 2 in the raw data file of radar echo signal
Acquisition data take out Position Number in the channel I and the channel Q respectively in the acquisition data for the pulse repetition period found
Data between N1 and N2.Above-mentioned obtained data, radar return letter corresponding to the cyclic annular frame of the fan exactly drawn
Number initial data, finding can individually store after the partial data convenient for further researching and analysing.
The method that regional area signal is extracted in the slave radar echo signal of the present embodiment, first in radar PPI picture
The range of Region Of Interest is accurately determined by defining fan-shaped edge, then position of the anti-data for pushing away selection region in original document
It sets, can be convenient the region for efficiently finding and being concerned about where data, and accurately extract required data, will not cause to lose
It loses useful data or introduces redundant data, and data extraction operation is simple, calculation amount is small.
As a preferred embodiment, in step S3, the calculation method of θ 1 and θ 2 are as follows:
The calculation method of R1 and R2 are as follows:
Wherein, (X0,Y0) be in PPI picture screen rectangular coordinate system origin, (x1,y1) it is that the fan is cyclic annular
The coordinate of the wherein wherein end point of a straight flange of frame, (x2,y2)、(x3,y3) be respectively the cyclic annular frame of the fan in addition
The coordinate of the two-end-point of one straight flange, and (X0,Y0) it is it is known that (x1,y1)、(x2,y2)、(x3,y3) can be obtained by cursor position
?.
As shown in figure 3, θ1For the start angle for fanning cyclic annular frame, θ2For the angle at the end for fanning cyclic annular frame, R1It is cyclic annular for fan
The starting distance of frame, R2For the terminating distance for fanning cyclic annular frame.θ1And θ2Value, R1And R2Value, can pass through and fan cyclic annular side
The vertex screen coordinate value of frame and the screen coordinate value of rectangular coordinate system origin turn polar coordinate transform by rectangular co-ordinate
It obtains, and screen coordinate value can be obtained directly during adjusting edge by operating system.
In step S4, the calculation method of ρ 1 and ρ 2 are as follows:
Wherein, R is the display radius in PPI picture, and D is the display range in PPI picture, and the unit of R and D are pixel
Number.
In step S5, the calculation method of Position Number N1 and N2 are as follows:
Wherein,It is accorded with for downward rounding operation,For the operator that rounds up, c is the light velocity, fsFor radar echo signal
Frequency acquisition is rounded up by coboundary, and lower boundary is rounded downwards calculating, Region Of Interest can be all included, and is prevented
Leak-stopping falls key message.
In step S1, method that radar echo signal is shown in the PPI picture are as follows:
Radar signal includes the channel I and the channel Q, each group of radar echo signal include echo angle value, the channel I not
Reception data in the same time, the channel Q different moments reception data, wherein echo angle value is θnWhen, the channel I and the channel Q
I-th of reception data be respectively IiAnd Qi, coordinate (x of this in rectangular coordinate systemin,yin) are as follows:
Wherein, straight (X0,Y0) be in PPI picture screen rectangular coordinate system origin, R be PPI display interface in
Show that radius, D are the display range in PPI display interface, the unit of R and D are pixel number, and c is the light velocity, fsFor radar return
The frequency acquisition of signal, i are natural number.
Certainly, the above description is not a limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the those of ordinary skill in domain is made within the essential scope of the present invention, also should belong to this hair
Bright protection scope.
Claims (5)
1. a kind of method for extracting regional area signal from radar echo signal, which comprises the following steps:
(1), rectangular coordinates transformation will be carried out with the radar echo signal that distance and angle indicate under polar coordinates, and in computer screen
It is shown on curtain coordinate with PPI picture Show Styles；
(2), it is drawn in the PPI picture and fans cyclic annular frame, Region Of Interest is included in the cyclic annular frame of the fan, the fan
The extended line of two straight flanges of cyclic annular frame passes through the origin of screen rectangular coordinate system in PPI picture, the cyclic annular side of the fan respectively
The two other side of frame is using the origin of screen rectangular coordinate system in PPI picture as the center of circle, different two circular arcs of arc radius；
(3), it calculates in two straight flanges and the PPI picture for fanning cyclic annular frame between the longitudinal axis of screen rectangular coordinate system
Angle, respectively θ 1 and θ 2, calculate the distance between two arc sides for fanning cyclic annular frame and described origin, respectively R1 with
R2, wherein the unit of R1 and R2 is pixel number；
(4), R1 and R2 actual range ρ 1 and ρ 2 corresponding in real space are calculated；
(5), calculating the actual range away from radar respectively is the echo-signal at the position of ρ 1 and ρ 2 in each pulse repetition period
Position Number N1 and N2；
(6), from finding out pulse repetition period of the angle between θ 1 and θ 2 in the raw data file of radar echo signal
Data are acquired, in the acquisition data for the pulse repetition period found, take out Position Number position in the channel I and the channel Q respectively
Data between N1 and N2, wherein in any pulse repetition period, the Position Number for acquiring data is suitable according to natural number sequence
Secondary arrangement.
2. the method according to claim 1 for extracting regional area signal from radar echo signal, which is characterized in that step
Suddenly in (3), the calculation method of θ 1 and θ 2 are as follows:
The calculation method of R1 and R2 are as follows:
Wherein, (X0,Y0) be PPI picture in screen rectangular coordinate system origin, (x1,y1) it is its for fanning cyclic annular frame
In a straight flange wherein end point coordinate, (x2,y2)、(x3,y3) it is respectively the other straight flange for fanning cyclic annular frame
Two-end-point coordinate, and (X0,Y0) it is it is known that (x1,y1)、(x2,y2)、(x3,y3) can be obtained by cursor position.
3. the method according to claim 2 for extracting regional area signal from radar echo signal, which is characterized in that step
Suddenly in (4), the calculation method of ρ 1 and ρ 2 are as follows:
Wherein, R is the display radius in PPI picture, and D is the display range of PPI picture, and the unit of R and D are pixel number.
4. the method according to claim 3 for extracting regional area signal from radar echo signal, which is characterized in that step
Suddenly in (5), the calculation method of Position Number N1 and N2 are as follows:
Wherein,It is accorded with for downward rounding operation,For the operator that rounds up, c is the light velocity, fsFor the acquisition of radar echo signal
Frequency.
5. special according to the described in any item methods for extracting regional area signal from radar echo signal of claim 2-4
Sign is, in step (1), method that radar echo signal is shown in the PPI picture are as follows:
Radar signal includes the channel I and the channel Q, each group of radar echo signal include echo angle value, the channel I when different
The reception data at quarter, the channel Q different moments reception data, wherein echo angle value is θnWhen, the of the channel I and the channel Q
I reception data are respectively IiAnd Qi, coordinate (x of this in rectangular coordinate systemin,yin) are as follows:
Wherein, R is the display radius in PPI picture, and D is the display range in PPI picture, and the unit of R and D are pixel number, c
For the light velocity, fsFor the frequency acquisition of radar echo signal, i is natural number.
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