CN108535730B - Doppler meteorological radar speed ambiguity resolution method and system - Google Patents

Doppler meteorological radar speed ambiguity resolution method and system Download PDF

Info

Publication number
CN108535730B
CN108535730B CN201810338449.7A CN201810338449A CN108535730B CN 108535730 B CN108535730 B CN 108535730B CN 201810338449 A CN201810338449 A CN 201810338449A CN 108535730 B CN108535730 B CN 108535730B
Authority
CN
China
Prior art keywords
signal
pulse signal
pulse
doppler
meteorological
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
Application number
CN201810338449.7A
Other languages
Chinese (zh)
Other versions
CN108535730A (en
Inventor
魏加华
黄跃飞
翁燕章
李铁键
解宏伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qinghai University
Original Assignee
Qinghai University
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Qinghai University filed Critical Qinghai University
Priority to CN201810338449.7A priority Critical patent/CN108535730B/en
Publication of CN108535730A publication Critical patent/CN108535730A/en
Application granted granted Critical
Publication of CN108535730B publication Critical patent/CN108535730B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • 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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The invention provides a method and a system for resolving speed ambiguity of a Doppler meteorological radar, wherein the method comprises the following steps: s1, simultaneously sending a first pulse signal and a second pulse signal to the moving meteorological target through a Doppler meteorological radar, and receiving a first echo signal reflected by the first pulse signal and the moving meteorological target after the action, a second echo signal reflected by the second pulse signal and the moving meteorological target after the action, wherein the pulse repetition period of the first pulse signal is the same as that of the second pulse signal; s2, synthesizing the first echo signal and the second echo signal to obtain a synthesized signal; and S3, acquiring the Doppler center frequency of the synthesized signal, and obtaining the average radial average speed of the moving meteorological target without speed blurring based on the Doppler center frequency. The equivalent wavelength amplitude is increased through the synthesized signal, the Doppler center frequency of a target in the synthesized signal is reduced, and Doppler center frequency ambiguity caused by velocity ambiguity is removed.

Description

Doppler meteorological radar speed ambiguity resolution method and system
Technical Field
The invention relates to the technical field of meteorological radars, in particular to a Doppler meteorological radar speed ambiguity resolution method and system.
Background
The pulse Doppler meteorological radar is a radar for meteorological detection by utilizing Doppler effect formed by relative movement of radar and scatterer targets such as cloud, rain and the like, has the function of detecting the position and strength of a precipitation echo by using a conventional weather radar, and can obtain the average radial movement speed and the velocity spectrum width estimated value of precipitation particles in an effective irradiation volume of a radar signal by using a Doppler principle, thereby further reflecting the distribution of atmospheric wind field and airflow vertical speed, turbulence conditions and the like, realizing early warning on disasters such as tornado cyclone, hostile storm circulation, strong snowfall, hail and the like, and having wide application prospect in the fields of agriculture, traffic, atmospheric physics research and the like.
The velocity ambiguity refers to the phenomenon that when the pulse Doppler radar works and at medium-low repetition frequency, the true velocity of a target is difficult to distinguish due to confusion of the velocity of the target measured by the frequency spectrum overlapping phenomenon. Maximum unambiguous range means that when a pulse from the radar encounters a backscattered wave from a target at that range and returns to the radar, the next radar pulse is emitted. That is, the time it takes for a radar wave to propagate to a target object located at the maximum unambiguous distance, and its echo then returns to the radar is exactly the time interval between two pulses. In the pulse Doppler meteorological radar, the maximum unambiguous detection range is in direct proportion to the repetition period of the transmitted pulse signal, and the maximum unambiguous Doppler frequency or speed is in inverse proportion to the repetition period of the transmitted pulse signal, namely, the range ambiguity problem and the speed ambiguity problem are a pair of contradictory problems. Generally, meteorological targets are mostly body targets continuously distributed in a space, the dynamic range of echoes is large, and for a fixed pulse repetition period, the meteorological echoes can simultaneously have the problems of speed ambiguity and distance ambiguity.
At present, the common practice is to adopt a suitable pulse repetition period to preferentially ensure the unambiguous range of the radar, and then perform a velocity ambiguity resolution operation on the doppler velocity, wherein the common velocity ambiguity resolution methods include a staggered variation repetition period pulse method, a phase coding ambiguity resolution method and the like. The staggered variation repetition period pulse method is non-uniform sampling, and has no effective ground object filter, so that the application of the method is limited; symmetric side lobes appear on two sides of the center of the frequency spectrum of the weak echo recovered by the phase coding ambiguity resolution method, and have certain influence on the estimation of the spectral width.
Disclosure of Invention
The invention provides a Doppler meteorological radar speed ambiguity resolution method and a Doppler meteorological radar speed ambiguity resolution system which overcome the problems or at least partially solve the problems, and solves the problem that in the prior art, spectral width estimation is inaccurate due to symmetric side lobes on two sides of the center of a weak echo frequency spectrum.
According to one aspect of the invention, a Doppler meteorological radar velocity ambiguity resolution method is provided, and comprises the following steps:
s1, simultaneously sending a first pulse signal and a second pulse signal to the moving meteorological target through a Doppler meteorological radar, and receiving a first echo signal reflected by the first pulse signal and the moving meteorological target after the action, a second echo signal reflected by the second pulse signal and the moving meteorological target after the action, wherein the pulse repetition period of the first pulse signal is the same as that of the second pulse signal;
s2, synthesizing the first echo signal and the second echo signal to obtain a synthesized signal;
and S3, acquiring the Doppler center frequency of the synthesized signal, and obtaining the average radial average speed of the moving meteorological target without speed blurring based on the Doppler center frequency.
Preferably, the first pulse signal and the second pulse signal are coherent.
Preferably, the step S1 specifically includes:
selecting a two-channel Doppler meteorological radar, transmitting a first pulse signal to a moving meteorological target through a first channel of the two-channel Doppler meteorological radar, and transmitting a second pulse signal to the moving meteorological target through a second channel of the two-channel Doppler meteorological radar, wherein pulse repetition periods of the first pulse signal and the second pulse signal are the same, and the frequency diversity of the first pulse signal and the second pulse signal is realized;
after the first pulse signal and the second pulse signal are respectively transmitted, the first channel and the second channel are switched to a receiving state, the first channel receives a first echo signal reflected back after the first pulse signal and the moving meteorological target act, and the second channel receives a second echo signal reflected back after the second pulse signal and the moving meteorological target act.
Preferably, in step S1, the first pulse signal and the second pulse signal are both chirp-encoded signals, or the first pulse signal and the second pulse signal are both non-chirp-encoded signals.
Preferably, in step S1, the first pulse signal and the second pulse signal are both chirp-encoded signals, and respectively include:
Figure BDA0001629897290000031
Figure BDA0001629897290000032
in the formula, s1(t) is a first pulse signal, s2(t) is a second pulse signal, t ∈ [0, τ)]τ is a pulse time width of the first pulse signal and the second pulse signal, B is a pulse bandwidth of the first pulse signal and the second pulse signal, Δ T is a pulse repetition period, f1Is the carrier center frequency, f, of the first pulse signal2Is the carrier center frequency of the second pulse signal.
Preferably, the carrier center frequency f of the first pulse signal1The pulse center frequency f of the second pulse signal2Satisfies the following conditions:
Figure BDA0001629897290000033
where c is the propagation velocity of electromagnetic waves in vacuum, vrmaxThe maximum radial velocity of the moving meteorological target observed for the Doppler meteorological radar.
Preferably, the step S2 specifically includes:
performing pulse compression processing on the first echo signal to obtain a first one-dimensional image signal, and performing pulse compression processing on the second echo signal to obtain a second one-dimensional image signal;
and carrying out conjugate multiplication on the first one-dimensional image signal and the second one-dimensional image signal to obtain a synthesized signal.
Preferably, the step S3 specifically includes:
and acquiring the Doppler center frequency of the synthesized signal by an energy balance method, and obtaining the average radial velocity of the moving meteorological target without velocity ambiguity based on the Doppler center frequency of the synthesized signal, the carrier center frequency of the first pulse signal and the carrier center frequency of the second pulse signal.
Preferably, the average radial velocity of the moving meteorological object without velocity ambiguity is:
Figure BDA0001629897290000041
in the formula (I), the compound is shown in the specification,
Figure BDA0001629897290000042
is the doppler center frequency of the composite signal.
A doppler meteorological radar velocity ambiguity resolution system, comprising:
the dual-channel Doppler radar is used for simultaneously sending a first pulse signal and a second pulse signal with the same pulse repetition period to a moving meteorological target and receiving a first echo signal reflected back after the first pulse signal and the moving meteorological target act, and a second echo signal reflected back after the second pulse signal and the moving meteorological target act;
and the processing module is used for synthesizing the first echo signal and the second echo signal to obtain a synthesized signal, acquiring the Doppler center frequency of the synthesized signal, and obtaining the average radial average speed of the moving meteorological target without speed ambiguity based on the Doppler center frequency.
The invention provides a method and a system for solving velocity ambiguity of a Doppler meteorological radar, which simultaneously receive echo signals reflected after respective sending signals and moving meteorological targets act through a two-channel Doppler meteorological radar receiving and sending system, synthesize the echo signals of the two channels, greatly increase the equivalent wavelength of the obtained synthesized signals, reduce the Doppler center frequency of the targets in the synthesized signals to a greater extent, thereby removing the Doppler center frequency ambiguity caused by the velocity ambiguity, and simultaneously narrowing the Doppler bandwidth of the echo signals, thereby also removing the Doppler bandwidth ambiguity caused by the velocity ambiguity.
Drawings
FIG. 1 is a flow chart of a Doppler weather radar velocity ambiguity resolution method according to an embodiment of the invention;
FIG. 2 is a detailed flowchart of a Doppler weather radar velocity ambiguity resolution method according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The Doppler meteorological radar is an active remote sensing detection tool, has important application in measuring cloud, rainfall and various internal factors of strong convection weather occurrence and development, has a working principle that the Doppler effect is taken as a basis, can measure the speed of a scattering body relative to the radar, and can reflect the distribution of atmospheric wind field and airflow vertical speed, turbulence condition and the like under a certain condition. In pulsed doppler meteorological radar, the maximum unambiguous range is expressed as:
Figure BDA0001629897290000051
where c is the propagation speed of the electromagnetic wave in vacuum, and Δ T is the pulse repetition period. When the distance of the real meteorological target exceeds RmaxIn the process, the position of the radar echo is not in the pulse repetition period of the transmitting pulse generating the echo, so that distance ambiguity is generated, and the pulse repetition period is increased as much as possible to avoid the problem of distance ambiguity. However, the pulse repetition period is also the sampling frequency when the echo of the moving meteorological target is Doppler-processed, and if it is too large, the Nyquist undersampling phenomenon occurs, and the true of the moving meteorological target cannot be realizedReal Doppler frequency fdAt a representable Doppler frequency axis range of [ -1/2 Δ T, 1/2 Δ T]Within. In general, the maximum doppler frequency that a pulsed doppler radar can detect is:
Figure BDA0001629897290000052
and according to the relation f of the radial velocity v and the Doppler frequency between the target and the radard2v/λ, where λ represents the carrier wavelength of the radar transmitted pulse signal, the maximum unambiguous velocity of a pulse doppler radar available is:
Figure BDA0001629897290000061
thus, the maximum unambiguous distance and speed relationship is:
Figure BDA0001629897290000062
it can be seen that range ambiguity and velocity ambiguity are contradictory for a radar of a fixed single wavelength or frequency. Usually, most meteorological targets are body targets, are distributed continuously in space, and the dynamic range of echoes is large, so that for a fixed pulse repetition frequency, the meteorological echoes not only have speed ambiguity, but also have distance ambiguity. At present, the common practice is to adopt a suitable pulse repetition period to preferentially ensure the unambiguous range of the radar, and then perform ambiguity resolution on the doppler velocity, wherein the common ambiguity resolution methods include a staggered variation repetition period pulse method, a phase coding ambiguity resolution method and the like. The staggered variation repetition period pulse method is non-uniform sampling, and has no effective ground object filter, so that the application of the method is limited; symmetric side lobes appear on two sides of the center of the frequency spectrum of the weak echo recovered by the phase coding ambiguity resolution method, and have certain influence on the estimation of the spectral width.
In the present embodiment, as shown in fig. 1 and fig. 2, a doppler meteorological radar velocity ambiguity resolution method is shown, and includes:
s1, simultaneously sending a first pulse signal and a second pulse signal with the same pulse repetition period to the moving meteorological target through the Doppler meteorological radar, and receiving a first echo signal reflected by the first pulse signal and the moving meteorological target after the action, a second echo signal reflected by the second pulse signal and the moving meteorological target after the action;
s2, synthesizing the first echo signal and the second echo signal to obtain a synthesized signal;
and S3, acquiring the Doppler center frequency of the synthesized signal, and obtaining the average radial average speed of the moving meteorological target without speed blurring based on the Doppler center frequency.
In this embodiment, the first pulse signal and the second pulse signal satisfy a coherent condition.
In this embodiment, the step S1 specifically includes:
selecting a two-channel Doppler meteorological radar, and transmitting a first pulse signal s to a moving meteorological target through a first channel of the two-channel Doppler meteorological radar1(t) a second channel of the two-channel Doppler meteorological radar transmits a second pulse signal s to the moving meteorological target2(T), the pulse repetition periods Δ T of the first pulse signal and the second pulse signal are the same, and the frequency diversity of the first pulse signal and the second pulse signal is achieved.
After the first pulse signal and the second pulse signal are transmitted, the first channel and the second channel are switched to a receiving state, the first channel receives a first echo signal reflected back after the first pulse signal and the moving meteorological target act, and the second channel receives a second echo signal reflected back after the second pulse signal and the moving meteorological target act.
In the present embodiment, the echo signal received in M pulse repetition periods is represented as sR1(T, m.DELTA.T) and sR2(T, M · Δ T), wherein M ═ 0, 1.
Specifically, in step S1, the first pulse signal and the second pulse signal are both chirp-encoded signals, or the first pulse signal and the second pulse signal are both non-chirp-encoded signals, and the two channels may transmit pulse signals in the same form.
Specifically, in step S1, the first pulse signal and the second pulse signal are both chirp encoded signals, which are respectively:
Figure BDA0001629897290000071
Figure BDA0001629897290000072
in the formula, s1(t) is a first pulse signal, s2(t) is a second pulse signal, t ∈ [0, τ)]For signal fast time, Δ T is the pulse repetition period, f1Is the carrier center frequency, f, of the first pulse signal2And the carrier center frequency of the second pulse signal, tau is the pulse time width of the first pulse signal and the second pulse signal, and B is the pulse bandwidth of the first pulse signal and the second pulse signal.
In this embodiment, a total of M pulse repetition periods are set, the moving meteorological targets of N individual resolution units are examined, and s is ordered1(t) and s2(T) T + m.DELTA.T in the transmitted signal is denoted T in a unified manner, and the two-channel echo signal is denoted sR1(T, m.DELTA.T) and sR2(T, m · Δ T), the expression of which is as follows:
Figure BDA0001629897290000081
Figure BDA0001629897290000082
in the above formula, where M is 0, 1., M-1 denotes the mth pulse repetition period, N is 1, 2., N denotes the moving meteorological target in the nth individual resolution unit; a. the1nAnd A2nRespectively representing the amplitude factor of each target in the two-channel echo signal,Rn(m · Δ T) represents an instantaneous slope distance of the radar from the nth target at the mth pulse resampling time m · Δ T;
in this embodiment, the carrier center frequency f of the first pulse signal1The pulse center frequency f of the second pulse signal2Satisfies the following conditions:
Figure BDA0001629897290000083
where c is the propagation velocity of electromagnetic waves in vacuum, vrmaxThe maximum radial velocity of the moving meteorological target observed by the Doppler meteorological radar is represented, namely the maximum radial velocity of the moving meteorological target which can be observed by the Doppler radar is required to be represented.
Specifically, the step S2 specifically includes:
for the first echo signal sR1(T, m.DELTA.T) to obtain a first one-dimensional image signal sPC1(T, m · Δ T) for the second echo signal sR2(T, m.DELTA.T) to obtain a second one-dimensional image signal sPC2(T, m · Δ T); specifically, the method comprises the following steps:
Figure BDA0001629897290000084
Figure BDA0001629897290000085
in the above equation, where sinc { } denotes a pulse of sinc form.
Performing conjugate multiplication on the first one-dimensional image signal and the second one-dimensional image signal to obtain a synthetic signal ssync(t，m·ΔT)＝sPC2(t，m·ΔT)×conj{sPC1(T, m · Δ T) }, the resultant signal is:
Figure BDA0001629897290000091
wherein conj {. is } represents the conjugation operatorThe cross term in the multiplication result is small enough to be ignored, and the theoretical value of the Doppler center frequency of the composite signal is fd＝2v(f2-f1) And/c, according to the relation:
Figure BDA0001629897290000092
it is known that the maximum radial velocity v can be observed for radar requirementsrmaxCorresponding to a Doppler frequency also within the non-ambiguous observation window of-1/2 Δ T, 1/2 Δ T that can be represented]I.e., no doppler or velocity ambiguity exists.
In this embodiment, the step S3 specifically includes:
obtaining the composite signal s by energy equalizationsyncDoppler center frequency of (T, m.DELTA.T)
Figure BDA0001629897290000093
And obtaining the average radial velocity of the moving meteorological target without velocity ambiguity based on the Doppler center frequency of the synthesized signal, the carrier center frequency of the first pulse signal and the carrier center frequency of the second pulse signal.
In this embodiment, the average radial velocity of the moving meteorological object without velocity ambiguity is:
Figure BDA0001629897290000094
in the formula (I), the compound is shown in the specification,
Figure BDA0001629897290000095
is the doppler center frequency of the composite signal.
The embodiment further provides a doppler meteorological radar velocity ambiguity resolution system, which comprises:
the dual-channel Doppler radar is used for simultaneously sending a first pulse signal and a second pulse signal with the same pulse repetition period to a moving meteorological target and receiving a first echo signal reflected back after the first pulse signal and the moving meteorological target act, and a second echo signal reflected back after the second pulse signal and the moving meteorological target act;
and the processing module is used for synthesizing the first echo signal and the second echo signal to obtain a synthesized signal, acquiring the Doppler center frequency of the synthesized signal, and obtaining the average radial average speed of the moving meteorological target without speed ambiguity based on the Doppler center frequency.
The first pulse signal and the second pulse signal transmitted by the two-channel Doppler radar in the embodiment meet the requirements of the method; the processing module adopts the Doppler meteorological radar speed ambiguity resolution method for processing.
In summary, the present invention provides a method and a system for resolving velocity ambiguity of a doppler meteorological radar, which simultaneously receive echo signals reflected after respective transmitted signals and moving meteorological targets act through a two-channel doppler meteorological radar transceiver system, and synthesize the echo signals of the two channels, so that the equivalent wavelength of the obtained synthesized signal is greatly increased, the doppler center frequency of the target in the synthesized signal is reduced to a greater extent, thereby removing the doppler center frequency ambiguity caused by velocity ambiguity, and simultaneously narrowing the doppler bandwidth of the echo signal, so that the doppler bandwidth ambiguity caused by velocity ambiguity can also be removed.
Finally, the method of the present invention is only a preferred embodiment and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A Doppler meteorological radar velocity ambiguity resolution method is characterized by comprising the following steps:
s1, simultaneously sending a first pulse signal and a second pulse signal to the moving meteorological target through a Doppler meteorological radar, and receiving a first echo signal reflected by the first pulse signal and the moving meteorological target after the action, a second echo signal reflected by the second pulse signal and the moving meteorological target after the action, wherein the pulse repetition period of the first pulse signal is the same as that of the second pulse signal;
s2, synthesizing the first echo signal and the second echo signal to obtain a synthesized signal;
s3, acquiring the Doppler center frequency of the synthesized signal, and obtaining the average radial average speed of the moving meteorological target without speed blurring based on the Doppler center frequency;
the step S2 specifically includes:
performing pulse compression processing on the first echo signal to obtain a first one-dimensional image signal, and performing pulse compression processing on the second echo signal to obtain a second one-dimensional image signal;
carrying out conjugate multiplication on the first one-dimensional image signal and the second one-dimensional image signal to obtain a synthesized signal;
the mean radial velocity of the moving meteorological target without velocity ambiguity is:
Figure FDA0002394631230000011
wherein c is the propagation speed of electromagnetic wave in vacuum,
Figure FDA0002394631230000012
is the Doppler center frequency, f, of the composite signal1Is the carrier center frequency, f, of the first pulse signal2Is the carrier center frequency of the second pulse signal.
2. The Doppler weather radar velocity ambiguity resolution method of claim 1, wherein the first pulse signal and the second pulse signal are coherent.
3. The Doppler weather radar velocity ambiguity resolution method according to claim 1, wherein the step S1 specifically comprises:
selecting a two-channel Doppler meteorological radar, transmitting a first pulse signal to a moving meteorological target through a first channel of the two-channel Doppler meteorological radar, and transmitting a second pulse signal to the moving meteorological target through a second channel of the two-channel Doppler meteorological radar, wherein pulse repetition periods of the first pulse signal and the second pulse signal are the same, and the frequency diversity of the first pulse signal and the second pulse signal is realized;
after the first pulse signal and the second pulse signal are respectively transmitted, the first channel and the second channel are switched to a receiving state, the first channel receives a first echo signal reflected back after the first pulse signal and the moving meteorological target act, and the second channel receives a second echo signal reflected back after the second pulse signal and the moving meteorological target act.
4. The Doppler weather radar velocity ambiguity resolution method of claim 1, wherein in step S1, the first pulse signal and the second pulse signal are both chirp-encoded signals or the first pulse signal and the second pulse signal are both non-chirp-encoded signals.
5. The Doppler weather radar velocity ambiguity resolution method according to claim 1, wherein in step S1, the first pulse signal and the second pulse signal are both chirp-encoded signals, which are respectively:
Figure FDA0002394631230000021
Figure FDA0002394631230000022
in the formula, s1(t) is a first pulse signal, s2(t) is a second pulse signal, t ∈ [0, τ)]τ is a pulse time width of the first pulse signal and the second pulse signal, B is a pulse bandwidth of the first pulse signal and the second pulse signal, and Δ T is a pulse repetitionPeriod, f1Is the carrier center frequency, f, of the first pulse signal2Is the carrier center frequency of the second pulse signal.
6. The Doppler weather radar velocity ambiguity resolution method of claim 5, wherein a carrier center frequency f of the first pulse signal1The pulse center frequency f of the second pulse signal2Satisfies the following conditions:
Figure FDA0002394631230000031
where c is the propagation velocity of electromagnetic waves in vacuum, vrmaxThe maximum radial velocity of the moving meteorological target observed for the Doppler meteorological radar.
7. The Doppler weather radar velocity ambiguity resolution method according to claim 6, wherein the step S3 specifically comprises:
and acquiring the Doppler center frequency of the synthesized signal by an energy balance method, and obtaining the average radial velocity of the moving meteorological target without velocity ambiguity based on the Doppler center frequency of the synthesized signal, the carrier center frequency of the first pulse signal and the carrier center frequency of the second pulse signal.
8. A Doppler meteorological radar velocity ambiguity resolution system, comprising:
the dual-channel Doppler radar is used for simultaneously sending a first pulse signal and a second pulse signal with the same pulse repetition period to a moving meteorological target and receiving a first echo signal reflected back after the first pulse signal and the moving meteorological target act, and a second echo signal reflected back after the second pulse signal and the moving meteorological target act;
the processing module is used for synthesizing the first echo signal and the second echo signal to obtain a synthesized signal, acquiring the Doppler center frequency of the synthesized signal, and obtaining the average radial average speed of the moving meteorological target without speed ambiguity based on the Doppler center frequency,
the method specifically comprises the following steps:
performing pulse compression processing on the first echo signal to obtain a first one-dimensional image signal, and performing pulse compression processing on the second echo signal to obtain a second one-dimensional image signal;
carrying out conjugate multiplication on the first one-dimensional image signal and the second one-dimensional image signal to obtain a synthesized signal;
the mean radial velocity of the moving meteorological target without velocity ambiguity is:
Figure FDA0002394631230000032
wherein c is the propagation speed of electromagnetic wave in vacuum,
Figure FDA0002394631230000033
is the Doppler center frequency, f, of the composite signal1Is the carrier center frequency, f, of the first pulse signal2Is the carrier center frequency of the second pulse signal.
CN201810338449.7A 2018-04-16 2018-04-16 Doppler meteorological radar speed ambiguity resolution method and system Active CN108535730B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810338449.7A CN108535730B (en) 2018-04-16 2018-04-16 Doppler meteorological radar speed ambiguity resolution method and system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810338449.7A CN108535730B (en) 2018-04-16 2018-04-16 Doppler meteorological radar speed ambiguity resolution method and system

Publications (2)

Publication Number Publication Date
CN108535730A CN108535730A (en) 2018-09-14
CN108535730B true CN108535730B (en) 2020-09-29

Family

ID=63481251

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810338449.7A Active CN108535730B (en) 2018-04-16 2018-04-16 Doppler meteorological radar speed ambiguity resolution method and system

Country Status (1)

Country Link
CN (1) CN108535730B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109164422A (en) * 2018-09-26 2019-01-08 西安电子科技大学 A kind of PD Radar Ambiguity Resolution distance measuring method based on shake repetition
CN109932700B (en) * 2019-03-28 2021-02-19 北京润科通用技术有限公司 Method and device for resolving ambiguity of Doppler velocity
WO2021035395A1 (en) * 2019-08-23 2021-03-04 深圳市大疆创新科技有限公司 Speed determining method and device, and storage medium
US11662454B2 (en) * 2020-11-02 2023-05-30 Ford Global Technologies, Llc Systems and methods for range-rate dealiasing using position consistency
CN113009489B (en) * 2021-02-04 2023-07-14 中国气象局气象探测中心 Fuzzy speed initial reference distance library selection method, system and equipment
CN114137508B (en) * 2022-01-29 2022-04-26 南京隼眼电子科技有限公司 Moving object speed deblurring method and device, electronic equipment and storage medium
CN114859313B (en) * 2022-04-28 2023-04-28 长沙祥云瑞风信息技术有限公司 Distance defuzzification method, system and equipment based on baseband frequency hopping

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010261845A (en) * 2009-05-08 2010-11-18 Toshiba Denpa Products Kk Radar image processing device
CN102385054A (en) * 2010-09-02 2012-03-21 何平 TPRF method for avoiding velocity measurement obscureness of Doppler weather radar
CN103149552A (en) * 2013-02-04 2013-06-12 南京信息工程大学 Retreating dim method of Doppler weather radar radial velocity field
CN104111450A (en) * 2014-05-23 2014-10-22 北京理工大学 Method and system for detecting object micro Doppler characteristics by use of double pulses

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106597425B (en) * 2016-11-18 2019-02-12 中国空间技术研究院 A kind of radar target localization method based on machine learning
CN107592176A (en) * 2017-08-16 2018-01-16 清华大学 The time of networking weather radar and frequency synchronization method and device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010261845A (en) * 2009-05-08 2010-11-18 Toshiba Denpa Products Kk Radar image processing device
CN102385054A (en) * 2010-09-02 2012-03-21 何平 TPRF method for avoiding velocity measurement obscureness of Doppler weather radar
CN103149552A (en) * 2013-02-04 2013-06-12 南京信息工程大学 Retreating dim method of Doppler weather radar radial velocity field
CN104111450A (en) * 2014-05-23 2014-10-22 北京理工大学 Method and system for detecting object micro Doppler characteristics by use of double pulses

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
新一代天气雷达退数据模糊方法探讨;潘新民等;《气象与环境科学》;20100228;第33卷(第1期);第17-23页 *
脉冲多普勒天气雷达解模糊处理;张弢;《现代雷达》;20071231;第29卷(第12期);第40-43页 *

Also Published As

Publication number Publication date
CN108535730A (en) 2018-09-14

Similar Documents

Publication Publication Date Title
CN108535730B (en) Doppler meteorological radar speed ambiguity resolution method and system
US9063225B2 (en) High resolution Doppler collision avoidance radar
KR101300085B1 (en) Pulse doppler coherent method and system for snr enhancement
AU2013327392B2 (en) Method for improving performance of a Sodar system
CN110297233B (en) LFMCW array radar signal parallel pipelining processing method
CN110907929B (en) Vehicle-mounted radar target detection method and device based on double-threshold detection
CN109613507B (en) Detection method for high-order maneuvering target radar echo
CN109061648B (en) Speed/distance ambiguity-resolved radar waveform design method based on frequency diversity
İnce et al. An S-band frequency-modulated continuous-wave boundary layer profiler: Description and initial results
CN111736150A (en) Detection method for remote low-power-consumption bird detection radar
US6982668B1 (en) Tangential velocity measurement using interferometric MTI radar
CN113419238A (en) Mountain landslide monitoring method based on millimeter wave radar, electronic device and storage medium
Lei A time-domain beamformer for UWB through-wall imaging
CN115616629A (en) Moving target detection compensation method based on space-based external radiation source signal
CN110907930B (en) Vehicle-mounted radar target detection and estimation method and device based on angle estimation
CN115128592A (en) Debris flow surface flow velocity monitoring method and system
Turk et al. High resolution signal processing techniques for millimeter wave short range surveillance radar
CN111337897A (en) LFMCW radar rapid target identification method
Braga et al. An ultra-wideband radar system for through-the-wall imaging using a mobile robot
Rytel-Andrianik et al. Simple X-band polarimetric micro-Doppler analyses of ground moving targets
Zeng et al. Grating lobes suppression method for stepped frequency GB-SAR system
Wang et al. Bistatic ISAR imaging based on BP algorithm
Ma et al. A method for improving efficiency of anti-UAV radar based on FMCW
Schöffl et al. A Perspective of Surge Dynamics in Natural Debris Flows Through Pulse‐Doppler Radar Observations
Setsu et al. Super-temporal resolution velocity vector estimation by kernel based Doppler estimation for UWB-TWI radars

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant