CN107179529A - Double frequency moves back velocity ambiguity and range ambiguity method and system in a kind of arteries and veins - Google Patents
Double frequency moves back velocity ambiguity and range ambiguity method and system in a kind of arteries and veins Download PDFInfo
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- CN107179529A CN107179529A CN201710379519.9A CN201710379519A CN107179529A CN 107179529 A CN107179529 A CN 107179529A CN 201710379519 A CN201710379519 A CN 201710379519A CN 107179529 A CN107179529 A CN 107179529A
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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
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Abstract
Velocity ambiguity and range ambiguity method and system are moved back the invention discloses double frequency in a kind of arteries and veins, system includes emission system and reception system, it also includes two-way digital waveform generation module, digital intermediate frequency receiving module and LDA signal processor module, described two-way digital waveform generation module produces the different transmitting pumping signal of two-way frequency, and export to emission system and through antenna to spatial emission, the received system processing of echo-signal that antenna is received obtains intermediate-freuqncy signal, digital intermediate frequency receiving module receives the intermediate-freuqncy signal, and the difference on the frequency launched of correspondence produces the echo-signals of two-way corresponding digital filter difference two frequencies of reception processing to zero intermediate frequency, export again and give LDA signal processor module, LDA signal processor module carries out corresponding ambiguity solution processing to two paths of signals, realize simultaneously and move back velocity ambiguity and range ambiguity.
Description
Technical field
The present invention relates to radar signal processing field, double frequency moves back velocity ambiguity and range ambiguity method in particularly a kind of arteries and veins
And system.
Background technology
Weather radar digital information processing system is mainly carried out at intensity, radial velocity and spectrum width estimation to weather echo
Manage, the information such as wind field to obtain echo signal intensity.For the radar of a fixed pulse repetition rate, it is maximum without fuzzy speed
Degree is represented by (1) formula.
In formula：
Vmax：The maximum fuzzy speed of nothing；
λ：Radar wavelength；
PRF：Radar pulse repetition frequency.
Its maximum unambiguous distance is represented by (2) formula.
In formula：
Rmax：Maximum unambiguous distance；
C：The light velocity.
So, its maximum product without fuzzy speed and maximum unambiguous distance is (3) formula.
RmaxVmax=± λ C/4 (3)
Be a constant on the right of above formula, thus to obtain it is maximum need to improve radar pulse repetition frequency without fuzzy speed, but
Improve radar pulse repetition frequency can then reduce maximum unambiguous distance, will exist sometimes speed covering and apart from covering can not
The contradiction taken into account.
In order to solve this contradiction, prior art (is generally divided into irregular no-load voltage ratio (APRF) and arteries and veins group using dual complex frequency
No-load voltage ratio (DPRF) two ways) release rate obscure；Range ambiguity is eliminated using phase coding method.But if radar pulse weight
Complex frequency is relatively low or wavelength is smaller, using dual complex frequency still it cannot be guaranteed that velocity ambiguity is completely eliminated；Using phase encoding
Echo signal-to-noise ratio degradation can be caused, still have considerable influence to the recovery of true echo data.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide double frequency in a kind of arteries and veins move back velocity ambiguity and away from
From blur method and system, the problem of fuzzy weather radar application medium velocity and range ambiguity can be solved simultaneously, in order to simultaneously
Range ambiguity and the contradiction of velocity ambiguity are solved, using transmitting double frequency digital waveform in arteries and veins, the pumping signal that digital waveform is produced
Different frequencies is used in arteries and veins, digital received passage is separated by different digital filters, it is double in the arteries and veins after separation
Frequency echo-signal is exported to Doppler's signal processing unit and handled, and realizes that release rate is obscured and range ambiguity simultaneously.
The purpose of the present invention is achieved through the following technical solutions：Double frequency moves back velocity ambiguity and apart from mould in a kind of arteries and veins
Paste system, it includes emission system and reception system, and it also includes two-way digital waveform generation module, digital intermediate frequency receiving module
With LDA signal processor module, described two-way digital waveform generation module produces the different transmitting excitation letter of two-way frequency
Number, and export to emission system and through antenna to spatial emission, during the received system processing of echo-signal that antenna is received is obtained
Frequency signal, digital intermediate frequency receiving module receives the intermediate-freuqncy signal, and the difference on the frequency that correspondence is launched produces the corresponding numeral filter of two-way
The echo-signal of ripple device difference two frequencies of reception processing is to zero intermediate frequency, then exports and give LDA signal processor module, Doppler
Signal processing module carries out corresponding ambiguity solution processing to two paths of signals, and velocity ambiguity and range ambiguity are moved back while realizing；
The different transmitting pumping signal of described two-way frequency is between low-repetition-frequency signal, two-way transmitting pumping signal
Time interval is small；
Described LDA signal processor module calculates expansion rate using pulse to facture.
Frequency between the different transmitting pumping signal of described two-way frequency at least differs 6MHz.
Double frequency moves back velocity ambiguity and range ambiguity method in a kind of arteries and veins, and it comprises the following steps：
S1, two-way digital waveform generation module produce the different low-repetition-frequency transmitting pumping signal of two-way frequency, and defeated
Go out to emission system and through antenna to spatial emission；
The received system processing of echo-signal that S2, antenna are received obtains intermediate-freuqncy signal；
S3, digital intermediate frequency receiving module receive the intermediate-freuqncy signal, and the difference on the frequency generation two-way that correspondence is launched is counted accordingly
The echo-signal of word wave filter difference two frequencies of reception processing is to zero intermediate frequency, then exports and give LDA signal processor module；
S4, LDA signal processor module carry out corresponding ambiguity solution processing to two paths of signals, while realizing back speed
Degree is obscured and range ambiguity；
Calculate expansion rate：
Wherein,
λ represents radar operation wavelength；
TfRepresent the cycle between double frequency in arteries and veins；
φ represents the phase difference between pulse；
Pumping signal is launched using low-repetition-frequency, it is to avoid range ambiguity.
Frequency between the different low-repetition-frequency transmitting pumping signal of described two-way frequency at least differs 6MHz.
The beneficial effects of the invention are as follows：Velocity ambiguity and range ambiguity side are moved back the invention provides double frequency in a kind of arteries and veins
Method and system, the problem of fuzzy weather radar application medium velocity and range ambiguity can be solved simultaneously, in order to solve distance simultaneously
The contradiction of fuzzy and velocity ambiguity, using double frequency digital waveform is launched in arteries and veins, the pumping signal that digital waveform is produced is adopted in arteries and veins
With different frequencies, digital received passage is separated by different digital filters, and double frequency echo is believed in the arteries and veins after separation
Number output is handled to Doppler's signal processing unit, realizes that release rate is fuzzy simultaneously and range ambiguity.
(1) velocity ambiguity can thoroughly either be solved using the present invention for S, C or millimere-wave band weather radar radar
Problem；
(2) radar pulse repetition frequency is reduced, while it is not in range ambiguity phenomenon to ensure from principle.
Brief description of the drawings
Fig. 1 is that double frequency moves back velocity ambiguity and the range ambiguity block diagram of system in arteries and veins；
Fig. 2 is double-frequency pulse transmitting schematic diagram in arteries and veins；
Fig. 3 is that two-way digital band-pass filter emulates schematic diagram.
Embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings, but protection scope of the present invention is not limited to
It is as described below.
Double frequency moves back velocity ambiguity and range ambiguity system in a kind of arteries and veins, and it includes emission system and reception system, and it is also wrapped
Include two-way digital waveform generation module, digital intermediate frequency receiving module and LDA signal processor module, described two-way digital wave
Shape generation module produces the different transmitting pumping signal of two-way frequency, and exports to emission system and through antenna to spatial emission,
The received system processing of echo-signal that antenna is received obtains intermediate-freuqncy signal, and digital intermediate frequency receiving module receives the intermediate-freuqncy signal,
And the difference on the frequency launched of correspondence produces the echo-signals of two-way corresponding digital filter difference two frequencies of reception processing to zero
Intermediate frequency, then export and give LDA signal processor module, LDA signal processor module is solved accordingly to two paths of signals
Fuzzy Processing, velocity ambiguity and range ambiguity are moved back while realizing；
The different transmitting pumping signal of described two-way frequency is between low-repetition-frequency signal, two-way transmitting pumping signal
Time interval is small；
Described LDA signal processor module calculates expansion rate using pulse to facture.
Frequency between the different transmitting pumping signal of described two-way frequency at least differs 6MHz.
As shown in figure 1, two-way digital waveform generation module produces two that frequency is respectively f1 and f2 according to control command
Transmitted waveform and transmitting impulse form as shown in Figure 2 is exported to emission system, and through antenna to spatial emission.Digital intermediate frequency connects
Receive module and receive the intermediate-freuqncy signal after the echo-signal received from antenna and the processing of received system, and the frequency that correspondence is launched
Difference produce the corresponding digital filter of two-way distinguish two frequencies of reception processing echo-signal to zero intermediate frequency I/Q signal export to
LDA signal processor module.LDA signal processor unit is received at the two-way zero intermediate frequency I/Q data of digital intermediate frequency output
Reason, wherein expansion rate fuzzy processing method is pressedHandled, the estimation and processing of the other specification such as intensity are used
Conventional Weather signal processing algorithm.
Double frequency moves back velocity ambiguity and range ambiguity method in a kind of arteries and veins, and it comprises the following steps：
S1, two-way digital waveform generation module produce the different low-repetition-frequency transmitting pumping signal of two-way frequency, and defeated
Go out to emission system and through antenna to spatial emission；
The received system processing of echo-signal that S2, antenna are received obtains intermediate-freuqncy signal；
S3, digital intermediate frequency receiving module receive the intermediate-freuqncy signal, and the difference on the frequency generation two-way that correspondence is launched is counted accordingly
The echo-signal of word wave filter difference two frequencies of reception processing is to zero intermediate frequency, then exports and give LDA signal processor module；
S4, LDA signal processor module carry out corresponding ambiguity solution processing to two paths of signals, while realizing back speed
Degree is obscured and range ambiguity；
Calculate expansion rate：
Wherein,
λ represents radar operation wavelength；
TfRepresent the cycle between double frequency in arteries and veins；
φ represents the phase difference between pulse；
Pumping signal is launched using low-repetition-frequency, it is to avoid range ambiguity.
Frequency between the different low-repetition-frequency transmitting pumping signal of described two-way frequency at least differs 6MHz.
Velocity ambiguity and range ambiguity are solved the problems, such as using the present invention simultaneously in low repetition., can be with when calculating intensity
It is averaged using two pulses of same distance section, pulse accumulation number is consistent in 500Hz and 1000Hz under same rotational speed,
And speed is calculated using being differed between two pulses in arteries and veins, umber of pulse is relative to reduce half.But because two pulse intervals
Small, such as 10 μ s are then 100000Hz equivalent to pulse recurrence frequency, are greatly expanded the scope of Doppler range rate measurement；Simultaneously
Because being worked using low repetition, the appearance of range ambiguity it also avoid.Its impulse ejection form is as shown in Figure 2.
Two frequency f1 and f2 time difference T in arteries and veinsf, the pulse repetition period is TrCarry out transmitting and back speed degree mould simultaneously can be achieved
Paste and range ambiguity.
For C-band radar, such as operation wavelength λ takes 5.45cm, the μ s of double-frequency pulse interval 10 (to be repeated equivalent to pulse
Frequency 100000Hz), calculated and understood according to expansion rate, ± 1300m/s distinguishable in theory velocity field, it is impossible to occur again
The possibility of velocity ambiguity.
In order to ensure without range ambiguity, reduction radar pulse repetition frequency is that can be achieved.But system is in the same pulse period
Quarantine measures are not taken between two waveforms of interior transmitting, such as two waveforms, then can introduce and interfere with each other, the reality of weather radar is influenceed
Border Effect on Detecting.The interference that system is solved in arteries and veins between pulse using the waveform of frequency division radiation pattern, i.e., two using different frequency is asked
Topic.The excitation that digital waveform is produced in arteries and veins between two waveforms using different frequency (such as center frequency point using 27MHz and
33MHz, at least differs 6MHz), such digital received passage is separated by different wave filters.6MHz or so frequency
Difference, more than 60dB is may be up to the isolation provided between two pulses in arteries and veins, and isolation between the two can ensure adjacent
Had little to no effect between pulse, so that it is guaranteed that ensuring while without range ambiguity to produce between two pulses in arteries and veins mutually
Interference.The cost that such a processing method is paid be digital receiver output IQ port numbers will from being added to two-way all the way, but
For actual detection effect, the increase of hardware is completely worth.Bandpass digital filter emulation schematic diagram such as Fig. 3 institutes
Show.
As shown in figure 1, two-way digital waveform generation module produces two that frequency is respectively f1 and f2 according to control command
Transmitted waveform and transmitting impulse form as shown in Figure 2 is exported to emission system, and through antenna to spatial emission.Digital intermediate frequency connects
Receive module and receive the intermediate-freuqncy signal after the echo-signal received from antenna and the processing of received system, and the frequency that correspondence is launched
Difference produce the corresponding digital filter of two-way distinguish two frequencies of reception processing echo-signal to zero intermediate frequency I/Q signal export to
LDA signal processor module.LDA signal processor unit is received at the two-way zero intermediate frequency I/Q data of digital intermediate frequency output
Reason, wherein expansion rate fuzzy processing method is pressedHandled, the estimation and processing of the other specification such as intensity are used
Conventional Weather signal processing algorithm.
Inputted using signal source analogue echo, under different Frequency Offsets, speed is extended using the method for the present invention
Spend measurement range data and the contrast of theoretical calculation velocity amplitude is as shown in table 1：
Velocity measurement and theoretical calculation the velocity amplitude contrast of the inventive method of table 1
As it can be seen from table 1 the velocity measurement and theoretical calculation velocity amplitude error amount of the inventive method 0.2m/s with
It is interior, fully meet the requirement that current Doppler Velocity error is less than 1m/s.
Input signal, the isolation effect tested respectively between two frequency bins, frequency division isolation degree test knot are used as by the use of signal source
Fruit is as shown in table 2.
Frequency division isolation degree test record sheet between 2 two waveforms of table
As can be seen from the above table, isolated using frequency division waveform, isolation is more than between two pulses during frequency interval 6MHz
69dB, low frequency is not interfere with each other between two pulses are also ensured that while guarantee without range ambiguity.
Claims (4)
1. double frequency moves back velocity ambiguity and range ambiguity system in a kind of arteries and veins, it includes emission system and reception system, and its feature exists
In：It also includes two-way digital waveform generation module, digital intermediate frequency receiving module and LDA signal processor module, and described is double
Railway digital waveform generation module produces the different transmitting pumping signal of two-way frequency, and exports to emission system and through antenna to sky
Between launch, the echo-signal received system processing that antenna is received obtains intermediate-freuqncy signal, and digital intermediate frequency receiving module is received in this
Frequency signal, and the difference on the frequency that correspondence is launched produces the echo letter that the corresponding digital filter of two-way distinguishes two frequencies of reception processing
Number to zero intermediate frequency, then export and give LDA signal processor module, LDA signal processor module carries out carry out phase to two paths of signals
The ambiguity solution processing answered, velocity ambiguity and range ambiguity are moved back while realizing；
The different transmitting pumping signal of described two-way frequency is the time between low-repetition-frequency signal, two-way transmitting pumping signal
Interval is small；
Described LDA signal processor module calculates expansion rate using pulse to facture.
2. double frequency moves back velocity ambiguity and range ambiguity system in a kind of arteries and veins according to claim 1, it is characterised in that：It is described
The different transmitting pumping signal of two-way frequency between frequency at least differ 6MHz.
3. double frequency moves back velocity ambiguity and range ambiguity system back speed degree in a kind of arteries and veins as described in any one in claim 1-2
The method of fuzzy and range ambiguity, it is characterised in that it comprises the following steps：
S1, two-way digital waveform generation module produce the different low-repetition-frequency transmitting pumping signal of two-way frequency, and export extremely
Emission system and through antenna to spatial emission；
The received system processing of echo-signal that S2, antenna are received obtains intermediate-freuqncy signal；
S3, digital intermediate frequency receiving module receive the intermediate-freuqncy signal, and the difference on the frequency that correspondence is launched produces the corresponding numeral filter of two-way
The echo-signal of ripple device difference two frequencies of reception processing is to zero intermediate frequency, then exports and give LDA signal processor module；
S4, LDA signal processor module carry out corresponding ambiguity solution processing to two paths of signals, while realizing back speed degree mould
Paste and range ambiguity；
Calculate expansion rate：
Wherein,
λ represents radar operation wavelength；
TfRepresent the cycle between double frequency in arteries and veins；
φ represents the phase difference between pulse；
Pumping signal is launched using low-repetition-frequency, it is to avoid range ambiguity.
4. the method that double frequency moves back velocity ambiguity and range ambiguity in a kind of arteries and veins according to claim 3, it is characterised in that：Institute
Frequency between the different low-repetition-frequency transmitting pumping signal of the two-way frequency stated at least differs 6MHz.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208731A (en) * | 2019-06-17 | 2019-09-06 | 哈尔滨工程大学 | A kind of high frame per second is without fuzzy hydrolocation method |
| CN111983579A (en) * | 2020-08-14 | 2020-11-24 | 成都亘波雷达科技有限公司 | Method for eliminating radar speed ambiguity by using pulse repetition time of difference |
| CN112119328A (en) * | 2018-05-23 | 2020-12-22 | 三菱电机株式会社 | Radar apparatus |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6081221A (en) * | 1998-08-27 | 2000-06-27 | Zrnic; Dusan S. | Signal processing and systematic phase coding for mitigation of range and velocity ambiguities in Doppler weather radars |
| US7053813B1 (en) * | 2004-04-22 | 2006-05-30 | University Corporation For Atmospheric Research | Radar system |
| US7605744B1 (en) * | 2008-06-03 | 2009-10-20 | Vaisala Oyj | Method for extension of unambiguous range and velocity of a weather radar |
| CN103048695A (en) * | 2013-01-14 | 2013-04-17 | 四川九洲电器集团有限责任公司 | Detecting device based on combined barker code burst pulses |
| CN205507073U (en) * | 2016-03-30 | 2016-08-24 | 成都信息工程大学 | Weather radar signal processing device based on FPGA |
-
2017
- 2017-05-25 CN CN201710379519.9A patent/CN107179529A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6081221A (en) * | 1998-08-27 | 2000-06-27 | Zrnic; Dusan S. | Signal processing and systematic phase coding for mitigation of range and velocity ambiguities in Doppler weather radars |
| US7053813B1 (en) * | 2004-04-22 | 2006-05-30 | University Corporation For Atmospheric Research | Radar system |
| US7605744B1 (en) * | 2008-06-03 | 2009-10-20 | Vaisala Oyj | Method for extension of unambiguous range and velocity of a weather radar |
| CN103048695A (en) * | 2013-01-14 | 2013-04-17 | 四川九洲电器集团有限责任公司 | Detecting device based on combined barker code burst pulses |
| CN205507073U (en) * | 2016-03-30 | 2016-08-24 | 成都信息工程大学 | Weather radar signal processing device based on FPGA |
Non-Patent Citations (1)
| Title |
|---|
| 潘新民 等: "新一代天气雷达退数据模糊方法探讨", 《气象与环境科学》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112119328A (en) * | 2018-05-23 | 2020-12-22 | 三菱电机株式会社 | Radar apparatus |
| CN112119328B (en) * | 2018-05-23 | 2024-01-12 | 三菱电机株式会社 | Radar apparatus |
| CN110208731A (en) * | 2019-06-17 | 2019-09-06 | 哈尔滨工程大学 | A kind of high frame per second is without fuzzy hydrolocation method |
| CN110208731B (en) * | 2019-06-17 | 2022-09-20 | 哈尔滨工程大学 | High frame rate non-fuzzy underwater sound positioning method |
| CN111983579A (en) * | 2020-08-14 | 2020-11-24 | 成都亘波雷达科技有限公司 | Method for eliminating radar speed ambiguity by using pulse repetition time of difference |
| CN111983579B (en) * | 2020-08-14 | 2021-05-14 | 成都亘波雷达科技有限公司 | Method for eliminating radar speed ambiguity by using pulse repetition time of difference |
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Application publication date: 20170919 |