CN107340519A - A kind of weather radar rainfall detecting analytic system and method - Google Patents
A kind of weather radar rainfall detecting analytic system and method Download PDFInfo
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- CN107340519A CN107340519A CN201710529658.5A CN201710529658A CN107340519A CN 107340519 A CN107340519 A CN 107340519A CN 201710529658 A CN201710529658 A CN 201710529658A CN 107340519 A CN107340519 A CN 107340519A
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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
- G01S13/953—Radar or analogous systems specially adapted for specific applications for meteorological use mounted on aircraft
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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
- G01S7/414—Discriminating targets with respect to background clutter
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- 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
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Aviation & Aerospace Engineering (AREA)
- Electromagnetism (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a kind of weather radar rainfall detecting analytic system and method, belong to the field of detecting of airborne weather radar.The front end of receiver is provided with noise source；The output signal that noise source can be stablized, opening and the closing of the noise source are controlled by the main control unit of signal processor, AD sampled datas when being opened and closed by the digital signal processing unit difference recording noise source of signal processor, handle to obtain receiving channel yield value by calculating.Based on the method for weather radar rainfall detecting analytic system, Step 1: closing noise source, gain calibration power P is calculated according to the I/Q data of sampling module1；Step 2: opening noise source, gain calibration power P is calculated according to I/Q data2；Step 3: calculate noise coefficient F；Step 4: calculate the gain G of receiving channel；Step 5: the gain G of the receiving channel of calculating is handled；Can accurate measurement channel gain, eliminate influence of the channel gain error to meteorological detection Stability and veracity.
Description
Technical field
The invention belongs to the detection technology field of airborne weather radar, and in particular to a kind of weather radar rainfall detection analysis
System and method.
Background technology
The design of airborne weather radar at this stage, and it is not introduced into real-time measurement and calibration to channel gain, signal transacting
The middle channel gain value used, the single test result simply measured during laboratory or flight test, therefore, to rainfall
Following influence be present in result of detection：
1) due to the inherent characteristic of analog device, parameter has certain fluctuation, causes the parameter value used in software,
Value with actually controlling has certain difference.
2) parameter and intensity are linear relationship, and undulating value directly affects result of detection.
3) according to engineering experience, system gain amplifier presence ± 3dB fluctuation, so as to cause reflectivity factor probably ±
3dBZ change, the division of rainfall class letter, target strength display error be present, crew may be caused to misjudge, influence
Flight safety.
The content of the invention
The purpose of the present invention：In order to solve the above problems, the present invention proposes a kind of weather radar rainfall detection analysis system
System and method, according to the Cleaning Principle of receiving channel noise factor, in radar system running, dynamic detection receives logical
Road, real-time noise coefficient is obtained, so as to calculate real channel gain, ensure that the yield value that software uses leads to actual
Road yield value is consistent；Can effectively solve the problems, such as to detect stability and accuracy.
Technical scheme：A kind of weather radar rainfall detecting analytic system and method, including：Emitter, antenna,
Receiver and signal processor, the receiver are mainly put by front end and in receiving and formed, and the front end is provided with noise source；
The output signal that the noise source can be stablized, the opening of the noise source is controlled by the main control unit of signal processor
With closing, AD sampled datas when recording noise source opens and closes are distinguished by the digital signal processing unit of signal processor,
Handle to obtain receiving channel yield value by calculating.
Preferably, when the noise source is opened, receiving channel power output is less than the maximum that AD sampling modules can gather
Power, make the AD sampling modules control in unsaturated state.
Preferably, the noise source is produced by noise diode circuit.
A kind of weather radar rainfall detection analysis method, comprises the following steps：
Step 1: closing noise source, gain calibration power P 1 is calculated according to the I/Q data of sampling module；
Step 2: opening noise source, gain calibration power P 2 is calculated according to I/Q data；
Step 3: calculate noise coefficient F；
Wherein, No1：Channel output power when noise source is opened；
No2：Channel output power when noise source is closed；
ENR：Excess noise ratio, the constant drawn is measured for system is actual；
Step 4: calculate the gain G of receiving channel；
Wherein, Ni1：Channel input power when noise source is opened, is a constant；
Step 5: the gain G of the receiving channel of calculating is handled；
For single-frequency point situation, the yield value obtained by calculating is directly replaced into original fixation when reflectivity factor calculates
Value, optimize the judged result of meteorological target strength grade；
For multifrequency point situation, need to be smoothed the yield value of different frequent points before participating in calculating.
Preferably, for single-frequency point situation, the opening of control noise source or closing in the radar calibration cycle are chosen；
For multifrequency point situation, choose control noise source in the radar calibration cycle and beat on or off under each frequency respectively
Close.
The technology beneficial effect of technical solution of the present invention：A kind of weather radar rainfall detecting analytic system of the present invention and side
Method, accurate quick Measurement channel gain, influence of the channel gain error to meteorological detection accuracy is eliminated, improves airbome weather thunder
Up to the Stability and veracity to meteorological target acquisition, lifting airborne weather radar is to meteorological target danger classes and regional extent
The ability of accurate judgement, safer vectored flight safety.
Brief description of the drawings
Fig. 1 is a kind of system architecture signal of a preferred embodiment of weather radar rainfall detecting analytic system of the present invention
Figure；
Fig. 2 is a kind of schematic flow sheet of a preferred embodiment of weather radar rainfall detection analysis method of the present invention.
Embodiment
To make the purpose, technical scheme and advantage that the present invention is implemented clearer, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, identical from beginning to end or class
As label represent same or similar element or the element with same or like function.Described embodiment is the present invention
Part of the embodiment, rather than whole embodiments.The embodiments described below with reference to the accompanying drawings are exemplary, it is intended to uses
It is of the invention in explaining, and be not considered as limiting the invention.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.Under
Embodiments of the invention are described in detail with reference to accompanying drawing for face.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", "front", "rear",
The orientation or position relationship of the instruction such as "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer " is based on accompanying drawing institutes
The orientation or position relationship shown, it is for only for ease of the description present invention and simplifies description, rather than instruction or the dress for implying meaning
Put or element there must be specific orientation, with specific azimuth configuration and operation, therefore it is not intended that the present invention is protected
The limitation of scope.
Embodiments of the invention are described in detail below in conjunction with the accompanying drawings, refer to Fig. 1 to Fig. 2；
Analysis system is visited in a kind of weather radar rainfall, including：Emitter, antenna, receiver and signal processor, receiver
Mainly put and form by front end and in receiving, front end is provided with noise source, and the main down coversion for completing echo-signal, intermediate frequency filtering are put
Greatly, gain control etc. reason, the intermediate-freuqncy signal after processing is again data signal by AD sample conversions, delivers to digital processing element
Handled.
The output signal that noise source can be stablized, Push And Release is beaten by what the main control unit of signal processor controlled the noise source
Close, AD sampled datas when recording noise source opens and closes are distinguished by the digital signal processing unit of signal processor, passed through
Calculating handles to obtain receiving channel yield value.
In the present embodiment, the power of noise source, which is chosen, will consider whole receiving channel, and when noise source is opened, receiving channel is defeated
Go out power and be less than the peak power that can gather of AD sampling modules, make the control of AD sampling modules in unsaturated state, so as to keep away
Exempt from error occur when gain calculates；
The make and break control of noise source will can not influence radar system normal work, thus be chosen at system and complete calibration
During.
In the present embodiment, noise source is produced by noise diode circuit, and the diode pipeline can ensure stable output.
After radar system enters align mode, receiving channel yield value calculating is carried out, specifically includes following steps：
Step 1: closing noise source, gain calibration power P is calculated according to the I/Q data of sampling module1；
Step 2: opening noise source, gain calibration power P is calculated according to I/Q data2；
Step 3: calculate noise coefficient F；
Wherein, No1：Channel output power when noise source is opened；
No2：Channel output power when noise source is closed；
ENR：Excess noise ratio, the constant drawn is measured for system is actual；
Step 4: calculate the gain G of receiving channel；
Wherein, Ni1：Channel input power when noise source is opened, is a constant；
Step 5: the gain G of the receiving channel of calculating is handled；
1) single-frequency point situation is directed to, when reflectivity factor calculates by the yield value obtained by calculating directly instead of original solid
Definite value, optimize the judged result of meteorological target strength grade：
The fixed value obtained by single test will be directly replaced when reflectivity factor calculates, optimize meteorological target strength grade
Judged result.
2) multifrequency point situation is directed to, needs to be smoothed the yield value of different frequent points before participating in calculating：
In the case of multifrequency point (frequency hopping), due to hardware differences, the parameter that each frequency calculates can be slightly different, if
It is related to interframe accumulation, needs smoothly to be located according to gain calibration result of the actual conditions to different frequent points before participating in calculating
Reason.
In the present embodiment, for single-frequency point situation, the opening of control noise source or closing in the radar calibration cycle are chosen；
For multifrequency point situation, choose control noise source in the radar calibration cycle and beat on or off under each frequency respectively
Close.
Analysis system and method are visited in a kind of weather radar rainfall of the present invention increases noise diode circuit in receiving front-end, real
Dynamic calibration gain amplifier is showed, the inaccuracy and unstability for effectively solving the rainfall intensity that parameter ripple control is brought；
Simultaneously when amplification channel first stage amplifier exception, it can still be obtained in detection range by real time calibration design effective
Rainfall intensity, further increase the reliability of radar system.
The present invention only need to increase an appropriate noise of power in the design of conventional on-board weather radar receiving channel
Source, the form controlled by optimization software can be achieved.
One aspect of the present invention can thoroughly solve influence of the receiving channel gain error to meteorological detection accuracy, elevator
Airborne weather radar is to meteorological target danger classes and the ability of regional extent accurate judgement, safer vectored flight safety.
On the other hand the different batches of unstable phenomenons of inner room result of detection can be completely eliminated, give up pilot driver difference
The misgivings inconsistent to meteorological detection result during sortie aircraft, it can more accurately judge dangerous meteorological and planning aircraft rule for it
Keep away path and provide strong foundation.
Patent of the present invention can be applied to dual-use airborne weather radar field, improve airborne weather radar to meteorological mesh
The Stability and veracity of detection is marked, there is good market application foreground.The patent of invention financial cost is low simultaneously, and it is difficult to implement
Degree is easy, applies the lead time that can shorten receiver in product design, reduces debugging cost, reduces receiving channel again
The physical link of noise calibration, enhance the maintainability of system life cycle management.
It is last it is to be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations.To the greatest extent
The present invention is described in detail with reference to the foregoing embodiments for pipe, it will be understood by those within the art that：It is still
Technical scheme described in foregoing embodiments can be modified, or which part technical characteristic is equally replaced
Change；And these modifications or replacement, the essence of appropriate technical solution is departed from the essence of various embodiments of the present invention technical scheme
God and scope.
Claims (5)
1. analysis system is visited in a kind of weather radar rainfall, including：Emitter, antenna, receiver and signal processor, its feature exist
In：The receiver is mainly put by front end and in receiving and formed, and the front end is provided with noise source；
The output signal that the noise source can be stablized, Push And Release is beaten by what the main control unit of signal processor controlled the noise source
Close, AD sampled datas when recording noise source opens and closes are distinguished by the digital signal processing unit of signal processor, passed through
Calculating handles to obtain receiving channel yield value.
2. weather radar rainfall detecting analytic system according to claim 1, it is characterised in that：The noise source is opened
When, receiving channel power output is less than the peak power that AD sampling modules can gather, and makes the AD sampling modules control not
The state of saturation.
3. weather radar rainfall detecting analytic system according to claim 1, it is characterised in that：The noise source is by noise
Diode circuit produces.
A kind of 4. weather radar rainfall detection analysis method, it is characterised in that；Comprise the following steps：
Step 1: closing noise source, gain calibration power P is calculated according to the I/Q data of sampling module1；
Step 2: opening noise source, gain calibration power P is calculated according to I/Q data2；
Step 3: calculate noise coefficient F；
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</mrow>
</msub>
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</mrow>
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Wherein, No1：Channel output power when noise source is opened；
No2：Channel output power when noise source is closed；
ENR：Excess noise ratio, the constant drawn is measured for system is actual；
Step 4: calculate the gain G of receiving channel；
<mrow>
<mi>G</mi>
<mo>=</mo>
<mfrac>
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Wherein, Ni1：Channel input power when noise source is opened, is a constant；
Step 5: the gain G of the receiving channel of calculating is handled；
For single-frequency point situation, the yield value obtained by calculating is directly replaced into original fixed value when reflectivity factor calculates,
Optimize the judged result of meteorological target strength grade；
For multifrequency point situation, need to be smoothed the yield value of different frequent points before participating in calculating.
5. weather radar rainfall detection analysis method according to claim 4, it is characterised in that：
For single-frequency point situation, the opening of control noise source or closing in the radar calibration cycle are chosen；
For multifrequency point situation, choose control noise source in the radar calibration cycle and open or close under each frequency respectively.
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| CN201710529658.5A CN107340519B (en) | 2017-07-02 | 2017-07-02 | Weather radar rainfall detection analysis system and method |
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| CN201710529658.5A CN107340519B (en) | 2017-07-02 | 2017-07-02 | Weather radar rainfall detection analysis system and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108828542A (en) * | 2018-08-03 | 2018-11-16 | 中国航空工业集团公司雷华电子技术研究所 | A kind of airborne weather radar noise periods dynamic calibration method |
| CN109444835A (en) * | 2018-11-16 | 2019-03-08 | 北京遥感设备研究所 | A kind of receiving channel self checking method and system based on standing wave reflection |
| CN112051556A (en) * | 2020-09-11 | 2020-12-08 | 中国航空工业集团公司雷华电子技术研究所 | Radar receiving channel fault detection device and method thereof |
| CN115469313A (en) * | 2022-11-15 | 2022-12-13 | 成都远望探测技术有限公司 | Wave beam control device and method for marine shipborne meteorological radar |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108828542A (en) * | 2018-08-03 | 2018-11-16 | 中国航空工业集团公司雷华电子技术研究所 | A kind of airborne weather radar noise periods dynamic calibration method |
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| CN109444835A (en) * | 2018-11-16 | 2019-03-08 | 北京遥感设备研究所 | A kind of receiving channel self checking method and system based on standing wave reflection |
| CN112051556A (en) * | 2020-09-11 | 2020-12-08 | 中国航空工业集团公司雷华电子技术研究所 | Radar receiving channel fault detection device and method thereof |
| CN115469313A (en) * | 2022-11-15 | 2022-12-13 | 成都远望探测技术有限公司 | Wave beam control device and method for marine shipborne meteorological radar |
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