CN108535730A - A kind of Doppler weather radar solution velocity ambiguity method and system - Google Patents
A kind of Doppler weather radar solution velocity ambiguity method and system Download PDFInfo
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/95—Radar or analogous systems specially adapted for specific applications for meteorological use
- G01S13/958—Theoretical aspects
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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
- G01S7/41—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
- G01S7/415—Identification of targets based on measurements of movement associated with the target
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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
- G01S7/41—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
- G01S7/418—Theoretical aspects
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Abstract
The present invention provides a kind of Doppler weather radar solution velocity ambiguity method and system, the method includes：S1, the first pulse signal and the second pulse signal as target while being sent to moving gas by Doppler weather radar, and the second echo signal that first echo signal, the second pulse signal that first pulse signal is returned with moving gas as interacting goals back reflection are returned with moving gas as interacting goals back reflection is received, first pulse information is identical as the second pulse signal pulse repetition period；S2, the first echo signal and the second echo signal are synthesized, obtains composite signal；S3, the doppler centroid for obtaining the composite signal, and it is based on the doppler centroid, obtain average radial average speed without velocity ambiguity of the moving gas as target.Increase effective wavelength amplitude by composite signal, reduce the doppler centroid of target in composite signal, it is fuzzy to eliminate the doppler centroid caused by velocity ambiguity.
Description
Technical field
The present invention relates to weather radar technical fields, more particularly, to a kind of Doppler weather radar solution velocity ambiguity
Method and system.
Background technology
Pulse Doppler Weather Radar is to be formed by Doppler using the scatterers target relative movement such as radar and cloud, rain
Effect and a kind of radar for carrying out meteorological detection have the function of position, the intensity of conventional Weather detection precipitation echo,
Precipitation particles average radial movement velocity and speed in the effective irradiated volume of radar signal can be obtained using doppler principle simultaneously
Spectrum width estimated value, so as to further be finally inversed by atmospheric wind, the distribution of air-flow vertical speed and turbulent flow conditions etc., realization pair
The diastrous weathers early warning such as cyclone cyclone, abominable storm circulation, heavy snowfall, hail, grind in agricultural, traffic, atmospheric physics
Study carefully equal fields and suffers from the foreground of being widely applied.
Velocity ambiguity refers to working in pulse Doppler radar, in middle low-repetition-frequency, since spectrum overlapping phenomenon is drawn
It acts surveyed target velocity to obscure, it is difficult to the phenomenon that resolution target true velocity.Maximum unam refers to, when radar is sent out
A pulse encounter the object at the distance generation backward scattered wave return to radar when, next radar pulse is just
It sends out.That is, radar wave propagation, to the object at the maximum unam, then its echo returns again to radar
Time is just the time interval between two pulses.In Pulse Doppler Weather Radar, most very much not fuzzy detection away from
From to transmitting the repetition period of pulse signal it is directly proportional, and its most very much not ambiguous Doppler frequency or speed are inversely proportional to transmitting arteries and veins
It rushes the repetition period of signal, i.e., the problem of range ambiguity problem and velocity ambiguity problem are conflicts.In general, meteorological target is big
Mostly continuously distributed body target in space, and the dynamic range of echo is larger, for the fixed pulse repetition period,
Velocity ambiguity and range ambiguity problem can occur simultaneously for weather echo.
Currently, common way is preferentially to ensure the not fogging action distance of radar using the suitable pulse repetition period,
Then solution velocity ambiguity operation is carried out to doppler velocity, the common velocity ambiguity method that solves includes irregular change repetition period pulse
Method, phase code ambiguity solution method etc..Wherein, irregular change repetition period impulse method is due to being nonuniform sampling, without effective
Atural object filter limits the application of this method；The spectral centroid both sides meeting for the weak echo that phase code ambiguity solution method is restored
There is symmetrical secondary lobe, has a certain impact to the estimation tool of spectrum width.
Invention content
It is meteorological that the present invention provides a kind of a kind of Doppler for overcoming the above problem or solving the above problems at least partly
Radar solution velocity ambiguity method and system solves in the prior art since symmetrical secondary lobe occur in weak echo spectral centroid both sides
The inaccurate problem of caused spectrum width estimation.
According to an aspect of the present invention, a kind of Doppler weather radar solution velocity ambiguity method is provided, including：
S1, the first pulse signal and the second pulse letter as target while being sent to moving gas by Doppler weather radar
Number, and receive first echo signal, the second pulse letter that first pulse signal is returned with moving gas as interacting goals back reflection
Number second echo signal returned as interacting goals back reflection with moving gas, first pulse information and second pulse signal
Pulse repetition period is identical；
S2, the first echo signal and the second echo signal are synthesized, obtains composite signal；
S3, the doppler centroid for obtaining the composite signal, and it is based on the doppler centroid, it obtains described
Average radial average speed without velocity ambiguity of the moving gas as target.
Preferably, first pulse signal and the second pulse signal coherent.
Preferably, the step S1 is specifically included：
Two channel doppler weather radar is selected, by the first passage of the two channel doppler weather radar to movement
The first pulse signal of meteorological objective emission, by the second channel of the two channel doppler weather radar to moving gas as target
Emit the second pulse signal, first pulse signal is identical and described with the pulse repetition period of second pulse signal
The frequency diversity of first pulse signal and second pulse signal；
After first pulse signal, the second pulse signal difference battery has fired, by the first passage and described the
Two channels are switched to reception state, and receive first pulse signal with moving gas as interacting goals by the first passage
The first echo signal that back reflection returns, the second channel receive second pulse signal with moving gas as anti-after interacting goals
The second echo signal being emitted back towards.
Preferably, in step sl, first pulse signal and second pulse signal are linear frequency modulation
Encoded signal or the first pulse signal and second pulse signal are nonlinear frequency modulation encoded signal.
Preferably, in step S1, first pulse signal and second pulse signal are that linear frequency modulation is compiled
Code signal, respectively：
In formula, s1(t) it is the first pulse signal, s2(t) it is the second pulse signal, t ∈ [0, τ], τ are first pulse
The pulse time width of signal and second pulse signal, B are the pulse of first pulse signal and second pulse signal
Bandwidth, Δ T are pulse repetition period, f1For the centre carrier frequency of first pulse signal, f2For second pulse signal
Centre carrier frequency.
Preferably, the centre carrier frequency f of first pulse signal1, the second pulse signal pulse center frequency
Rate f2Between meet：
In formula, c is the spread speed of electromagnetic wave in a vacuum, vrmaxThe movement observed for the Doppler weather radar
The maximum radial speed of meteorological target.
Preferably, the step S2 is specifically included：
Process of pulse-compression is carried out to the first echo signal, the first one-dimensional picture signal is obtained, to second echo
Signal carries out process of pulse-compression, and it is one-dimensional as signal to obtain second；
It is one-dimensional as signal, the second one-dimensional picture signal progress conjugate multiplication by described first, obtain composite signal.
Preferably, the step S3 is specifically included：
The doppler centroid of the composite signal is obtained by balancing energy method, and based on the more of the composite signal
General Le centre frequency, the centre carrier frequency of first pulse signal, the centre carrier frequency of second pulse signal, obtain
To the moving gas as the average radial velocity without velocity ambiguity of target.
Preferably, the moving gas is as the average radial velocity without velocity ambiguity of target：
In formula,For the doppler centroid of the composite signal.
A kind of Doppler weather radar solution velocity ambiguity system, including：
Two channel doppler radar, for as target while sending pulse repetition period identical first pulse to moving gas
Signal, the second pulse signal, and receive the first echo that first pulse signal is returned with moving gas as interacting goals back reflection
The second echo signal that signal, the second pulse signal are returned with moving gas as interacting goals back reflection；
Processing module obtains composite signal, obtains for synthesizing the first echo signal and the second echo signal
The doppler centroid of the composite signal is taken, and is based on the doppler centroid, obtains the moving gas as target
The average radial average speed without velocity ambiguity.
The present invention proposes a kind of Doppler weather radar solution velocity ambiguity method and system, passes through two channel doppler meteorology
Radar transmit-receive system, while the echo-signal for respectively sending signal with moving gas as interacting goals back reflection is received, it is logical to two
The echo-signal in road synthesizes, so as to get composite signal effective wavelength increase considerably, largely reduce mesh in composite signal
Target doppler centroid, it is fuzzy to eliminate the doppler centroid caused by velocity ambiguity, while echo being made to believe
Number doppler bandwidth narrow, thus it is fuzzy also to remove the doppler bandwidth caused by velocity ambiguity.
Description of the drawings
Fig. 1 is the Doppler weather radar solution velocity ambiguity method flow block diagram according to the embodiment of the present invention；
Fig. 2 is the Doppler weather radar solution velocity ambiguity method particular flow sheet according to the embodiment of the present invention.
Specific implementation mode
With reference to the accompanying drawings and examples, the specific implementation mode of the present invention is described in further detail.Implement below
Example is not limited to the scope of the present invention for illustrating the present invention.
Doppler weather radar is a kind of prospecting tools of active remote sensing, is measuring cloud, rainfall and various strong convective weathers
There are important application, operation principle that based on Doppler effect, scattering can be measured in terms of occurrence and development internal factor
Speed of the body relative to radar is finally inversed by atmospheric wind, the distribution of air-flow vertical speed and turbulent flow condition under certain condition
Deng.In Pulse Doppler Weather Radar, maximum unam is expressed as：
Wherein, c is electromagnetic wave spread speed in a vacuum, and Δ T is the pulse repetition period.When the distance of true meteorological target
Beyond RmaxWhen, radar return occur position not generate the echo transmitting pulse where pulse repetition period in,
Range ambiguity is thus produced, therefore to avoid range ambiguity problem, should as far as possible be increased the pulse repetition period.However, pulse
Repetition period simultaneously be also to moving gas as target echo carry out doppler processing when sample frequency can then go out if its is excessive
Existing Nyquist lack sampling phenomenon, cannot make the true Doppler frequency f of moving targetdIn denotable Doppler frequency axis
Within range [- 1/2 Δ T, 1/2 Δ T].In general, the maximum doppler frequency that pulse Doppler radar can detect is：
Again according to the relationship f of radial velocity v between target, radar and Doppler frequencyd=2v/ λ, wherein λ indicate radar
The carrier wavelength for emitting pulse signal, the most very much not fuzzy speed that can obtain pulse Doppler radar are：
Therefore, the relationship of maximum unam and speed is：
As it can be seen that for the radar of fixed single wavelength or frequency, range ambiguity and velocity ambiguity are conflicting.Usually
In the case of, meteorological target is mostly body target, continuously distributed in space, and the dynamic range of echo is very big, for fixed
For pulse recurrence frequency, velocity ambiguity can not only occur for weather echo, and there is also range ambiguity.Currently, common
Way is preferentially to ensure the not fogging action distance of radar using the suitable pulse repetition period, is then carried out to doppler velocity
Ambiguity solution operates, and the common velocity ambiguity method that solves includes irregular change repetition period impulse method, phase code ambiguity solution method etc..
Wherein, irregular change repetition period impulse method, without effective atural object filter, limits this method due to being nonuniform sampling
Using；The spectral centroid both sides for the weak echo that phase code ambiguity solution method is restored will appear symmetrical secondary lobe, estimate to spectrum width
Meter tool has a certain impact.
In the present embodiment, as depicted in figs. 1 and 2, a kind of Doppler weather radar solution velocity ambiguity side is shown in figure
Method, including：
S1, pulse repetition period identical first pulse as target while being sent to moving gas by Doppler weather radar
Signal, the second pulse signal, and receive the first echo that first pulse signal is returned with moving gas as interacting goals back reflection
The second echo signal that signal, the second pulse signal are returned with moving gas as interacting goals back reflection；
S2, the first echo signal and the second echo signal are synthesized, obtains composite signal；
S3, the doppler centroid for obtaining the composite signal, and it is based on the doppler centroid, it obtains described
Average radial average speed without velocity ambiguity of the moving gas as target.
In the present embodiment, first pulse signal and the second pulse signal meet coherent condition.
In the present embodiment, the step S1 is specifically included：
Select two channel doppler weather radar, by the first passage of two channel doppler weather radar to moving gas as
The first pulse signal of objective emission s1(t), the second channel of two channel doppler weather radar to moving gas as objective emission
Two pulse signal s2(t), the pulse repetition period Δ T-phase of first pulse signal and second pulse signal is same, and institute
State the frequency diversity of the first pulse signal and second pulse signal.
After first pulse signal, the second pulse signal battery has fired, by the first passage and the second channel
Be switched to reception state, the first passage receive first pulse signal and moving gas as interacting goals back reflection return the
One echo-signal, the second channel receive second time of second pulse signal with moving gas as interacting goals back reflection time
Wave signal.
In the present embodiment, if the echo-signal of M pulse repetition period reception is expressed as sR1(t, m Δ T) and sR2
(t, m Δ T), wherein m=0,1 ..., M-1.
Specifically, in step sl, first pulse signal and second pulse signal are linear frequency modulation coding
Signal or the first pulse signal and second pulse signal are nonlinear frequency modulation encoded signal, two channel emission pulses
Signal form is identical.
Specifically, in step S1, first pulse signal and second pulse signal are linear frequency modulation coding letter
Number, respectively：
In formula, s1(t) it is the first pulse signal, s2(t) it is the second pulse signal, t ∈ [0, τ] are signal fast time, Δ T
For pulse repetition period, f1For the centre carrier frequency of first pulse signal, f2In carrier wave for second pulse signal
Frequency of heart, τ be first pulse signal and second pulse signal pulse time width, B be first pulse signal and
The pulse bandwidth of second pulse signal.
In the present embodiment, if the total M pulse repetition period, the moving gas of N number of body resolution cell is investigated as target, and enable
s1(t) and s2(t) the t+m Δs T emitted in signal is collectively expressed as t, then two channel echo-signals are expressed as sR1(t, m Δ
) and s TR2(t, m Δ T), expression formula is as follows：
In above formula, wherein m=0,1 ..., M-1 indicate that m-th of pulse repetition period, n=1,2 ..., N indicate n-th
Moving gas in body resolution cell is as target；A1nAnd A2nAmplitude of each target in two channel echo-signals is indicated respectively
The factor, Rn(m Δ T) indicates the instantaneous oblique distance of radar and n-th of target in m-th of pulse repeated sampling moment m Δs T；
In the present embodiment, the centre carrier frequency f of first pulse signal1, the second pulse signal pulse center
Frequency f2Between meet：
In formula, c is the spread speed of electromagnetic wave in a vacuum, vrmaxThe movement observed for the Doppler weather radar
The maximum radial speed of meteorological target indicates the maximum radial speed that Doppler radar requires the moving gas that can be observed as target
Degree.
Specifically, the step S2 is specifically included：
To the first echo signal sR1(t, m Δ T) carries out process of pulse-compression, and it is one-dimensional as signal s to obtain firstPC1
(t, m Δ T), to the second echo signal sR2(t, m Δ T) carries out process of pulse-compression, and it is one-dimensional as signal to obtain second
sPC2(t, m Δ T)；Specifically：
In above formula, wherein sinc { } indicates the pulse of sinc forms.
It is one-dimensional as signal, the second one-dimensional picture signal progress conjugate multiplication by described first, obtain composite signal ssync(t,
M Δ T)=sPC2(t, m Δ T) × conj { sPC1(t, m Δ T) }, then composite signal is：
Adjoint operator is sought in wherein conj { } expressions, and the cross term in above-mentioned multiplied result can be ignored because sufficiently small,
The doppler centroid theoretical value of composite signal is fd=2v (f2-f1)/c, according to above-mentioned relational expression：
It is found that requiring to observe maximum radial speed v for radarrmaxMoving gas as target, it is corresponding how general
It strangles frequency to be also within the not fuzzy observation window [- 1/2 Δ T, 1/2 Δ T] that can be expressed, i.e., without Doppler or velocity ambiguity
In the presence of.
In the present embodiment, the step S3 is specifically included：
The composite signal s is obtained by balancing energy methodsyncThe doppler centroid of (t, m Δ T)And it is based on
The doppler centroid of the composite signal, the centre carrier frequency of first pulse signal, second pulse signal
Centre carrier frequency, obtain average radial velocity without velocity ambiguity of the moving gas as target.
In the present embodiment, the moving gas is as the average radial velocity without velocity ambiguity of target：
In formula,For the doppler centroid of the composite signal.
A kind of Doppler weather radar solution velocity ambiguity system is additionally provided in the present embodiment, including：
Two channel doppler radar, for as target while sending pulse repetition period identical first pulse to moving gas
Signal, the second pulse signal, and receive the first echo that first pulse signal is returned with moving gas as interacting goals back reflection
The second echo signal that signal, the second pulse signal are returned with moving gas as interacting goals back reflection；
Processing module obtains composite signal, obtains for synthesizing the first echo signal and the second echo signal
The doppler centroid of the composite signal is taken, and is based on the doppler centroid, obtains the moving gas as target
The average radial average speed without velocity ambiguity.
The first pulse signal, the second pulse signal of the two channel doppler radar transmitting of the present embodiment meet the above method
In requirement；Processing module is handled using above-mentioned Doppler weather radar solution velocity ambiguity method.
In conclusion the present invention proposes a kind of Doppler weather radar solution velocity ambiguity method and system, pass through binary channels
Doppler weather radar receive-transmit system, while receiving and respectively sending signal with moving gas as the echo of interacting goals back reflection is believed
Number, the echo-signal in two channels is synthesized, so as to get composite signal effective wavelength increase considerably, largely reduce and close
It is fuzzy to eliminate the doppler centroid caused by velocity ambiguity at the doppler centroid of target in signal, together
When so that the doppler bandwidth of echo-signal is narrowed, thus it is fuzzy also to remove the doppler bandwidth caused by velocity ambiguity.
Finally, method of the invention is only preferable embodiment, is not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent replacement, improvement and so on should be included in the protection of the present invention
Within the scope of.
Claims (10)
1. a kind of Doppler weather radar solution velocity ambiguity method, which is characterized in that including：
S1, the first pulse signal and the second pulse signal as target while being sent to moving gas by Doppler weather radar, and
Receive first echo signal, the second pulse signal and fortune that first pulse signal is returned with moving gas as interacting goals back reflection
It takes offence as the second echo signal of interacting goals back reflection time, first pulse information and the second pulse signal pulse weight
Multiple cycle phase is same；
S2, the first echo signal and the second echo signal are synthesized, obtains composite signal；
S3, the doppler centroid for obtaining the composite signal, and it is based on the doppler centroid, obtain the movement
The average radial average speed without velocity ambiguity of meteorological target.
2. Doppler weather radar solution velocity ambiguity method according to claim 1, which is characterized in that first pulse
Signal and the second pulse signal coherent.
3. Doppler weather radar solution velocity ambiguity method according to claim 1, which is characterized in that the step S1 tools
Body includes：
Select two channel doppler weather radar, by the first passage of the two channel doppler weather radar to moving gas as
The first pulse signal of objective emission, by the second channel of the two channel doppler weather radar to moving gas as objective emission
Second pulse signal, first pulse signal is identical with the pulse repetition period of second pulse signal, and described first
The frequency diversity of pulse signal and second pulse signal；
After first pulse signal, the second pulse signal difference battery has fired, the first passage and described second are led to
Road is switched to reception state, and receives first pulse signal with moving gas as anti-after interacting goals by the first passage
The first echo signal being emitted back towards, the second channel receive second pulse signal with moving gas as interacting goals back reflection returns
Second echo signal.
4. Doppler weather radar solution velocity ambiguity method according to claim 1, which is characterized in that in step sl,
First pulse signal and second pulse signal are linear frequency modulation encoded signal or the first pulse signal and described
Two pulse signals are nonlinear frequency modulation encoded signal.
5. Doppler weather radar solution velocity ambiguity method according to claim 1, which is characterized in that in step S1, institute
It is linear frequency modulation encoded signal to state the first pulse signal and second pulse signal, respectively：
In formula, s1(t) it is the first pulse signal, s2(t) it is the second pulse signal, t ∈ [0, τ], τ are first pulse signal
With the pulse time width of second pulse signal, B is the pulse bandwidth of first pulse signal and second pulse signal,
Δ T is pulse repetition period, f1For the centre carrier frequency of first pulse signal, f2For the load of second pulse signal
Wave centre frequency.
6. Doppler weather radar solution velocity ambiguity method according to claim 5, which is characterized in that first pulse
The centre carrier frequency f of signal1, the second pulse signal pulse center frequencies f2Between meet：
In formula, c is the spread speed of electromagnetic wave in a vacuum, vrmaxThe moving gas observed for the Doppler weather radar as
The maximum radial speed of target.
7. Doppler weather radar solution velocity ambiguity method according to claim 1, which is characterized in that the step S2 tools
Body includes：
Process of pulse-compression is carried out to the first echo signal, the first one-dimensional picture signal is obtained, to the second echo signal
Process of pulse-compression is carried out, it is one-dimensional as signal to obtain second；
It is one-dimensional as signal, the second one-dimensional picture signal progress conjugate multiplication by described first, obtain composite signal.
8. Doppler weather radar solution velocity ambiguity method according to claim 6, which is characterized in that the step S3 tools
Body includes：
The doppler centroid of the composite signal is obtained by balancing energy method, and based on the Doppler of the composite signal
Centre frequency, the centre carrier frequency of first pulse signal, the centre carrier frequency of second pulse signal, obtain institute
State average radial velocity without velocity ambiguity of the moving gas as target.
9. Doppler weather radar solution velocity ambiguity method according to claim 8, which is characterized in that the moving gas as
The average radial velocity without velocity ambiguity of target is：
In formula,For the doppler centroid of the composite signal.
10. a kind of Doppler weather radar solution velocity ambiguity system, which is characterized in that including：
Two channel doppler radar, for believing to moving gas as target sends pulse repetition period identical first pulse simultaneously
Number, the second pulse signal, and receive the first echo that first pulse signal and moving gas are returned as interacting goals back reflection and believe
Number, the second echo signal that is returned as interacting goals back reflection of the second pulse signal and moving gas；
Processing module obtains composite signal, obtains institute for synthesizing the first echo signal and the second echo signal
The doppler centroid of composite signal is stated, and is based on the doppler centroid, obtains nothing of the moving gas as target
The average radial average speed of velocity ambiguity.
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| CN114859313A (en) * | 2022-04-28 | 2022-08-05 | 长沙祥云瑞风信息技术有限公司 | Distance ambiguity resolving method, system and equipment based on baseband frequency hopping |
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