CN104678369A - Dual-polarization weather radar calibration method based on non-fixed metal ball - Google Patents
Dual-polarization weather radar calibration method based on non-fixed metal ball Download PDFInfo
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- CN104678369A CN104678369A CN201510036477.XA CN201510036477A CN104678369A CN 104678369 A CN104678369 A CN 104678369A CN 201510036477 A CN201510036477 A CN 201510036477A CN 104678369 A CN104678369 A CN 104678369A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000002184 metal Substances 0.000 title abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 238000010408 sweeping Methods 0.000 claims description 2
- 230000010287 polarization Effects 0.000 abstract description 6
- 238000002310 reflectometry Methods 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000010363 phase shift Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000028161 membrane depolarization Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- VMXUWOKSQNHOCA-UKTHLTGXSA-N ranitidine Chemical compound [O-][N+](=O)\C=C(/NC)NCCSCC1=CC=C(CN(C)C)O1 VMXUWOKSQNHOCA-UKTHLTGXSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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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
- G01S7/40—Means for monitoring or calibrating
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- Radar, Positioning & Navigation (AREA)
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- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a dual-polarization weather radar calibration method based on a non-fixed metal ball. The dual-polarization weather radar calibration method comprises the following steps: determining a calibration field according to a radar position; recording longitudes and latitudes of the radar position and a calibration position; calculating possible direction, elevation and distance relative to a calibration state of the metal ball according to the longitudes and latitudes and the height of a radar station; setting a scanning elevation and a scanning manner of a radar; raising the metal ball at a calibration region and setting a high-precision GPS (Global Position System) module at the bottom of the metal ball to control the radar to work according to the pre-set scanning manner, and recording IQ data and basic data of the radar; analyzing the data and finding out a metal ball target detected by the radar; and comparing the metal ball target with a theoretical value, calculating an error between an actual value and the theoretical value, and revising according to the error. The method is simple and feasible; the radar parameter calibration problem is solved when the metal ball moves, and all detection parameters of the polarization radar can be calibrated.
Description
Technical field
The present invention relates to a kind of method of dual polarization radar being carried out to system calibration, particularly relate to a kind of on-fixed Metal Ball that utilizes and the method for system calibration is carried out to dual polarization radar, belong to Radar Signal Processing research field.
Background technology
In modern weather field, weather radar is widely used in the various aspects such as real-time weather monitoring, drinking water project commander.And for weather radar system, system calibration is absolutely necessary work, and the radar without calibration cannot express current weather conditions with correct parameter.For single polarimetric radar, only need the calibration carrying out a passage; And for dual polarization radar, because it has horizontal and vertical two passages, then calibration must be carried out to two passages respectively, comprise the consistance calibration etc. of amplitude and phase place.
The method of radar calibration has a lot, is generally divided into online calibration and off-line calibration.Online calibration utilizes the device such as signal source, noise source being integrated in radar inside, self produces signal, and receives process through radar, demarcates the part such as receiving cable, transmission channel and calibrates.Off-line calibration is substantially identical with the principle of on-line proving, just replaces the devices such as integrated signal source by extension instrument.Wang Zhijun (1996) proposes the method utilizing Metal Ball to demarcate radar gain, and the method utilizes spheroid to be the feature of zero to incident wave depolarization effect, and according to the meteorological equation of point target, the power returned by radar calculates radar gain.Also propose simultaneously, if only need the gain inequality measuring horizontal and vertical passage, then can be demarcated by small rain droplets.Li Xiangying etc. (2002) utilize Radar RCS (Radar Cross Section) target property to demarcate radar.Li Yongxin etc. (2007) have also carried out the work of rcs measurement radar calibration error, utilize balloon suspension standard metal ball as standard calibration body, demarcate radar, find that the RCS of balloon has considerable influence to Radar Calibration result.Earle Williams et al. (2012) utilizes the ZDR of Metal Ball to KOUN radar and WSR-88D radar to demarcate, and has found the deviation that these two radars exist.
For polarimetric radar, the consistency calibration of horizontal and vertical passage is absolutely necessary.Although the method utilizing light rain to carry out calibration to radar is easy, due to the uncertainty of precipitation itself, calibration precision cannot precise quantification.Adopt the mode of balloon suspension Metal Ball, because balloon RCS has impact to calibration result, therefore calibration precision is also not easy to hold.Meanwhile, polarimetric radar has multiple polarization parameter, all needs to demarcate, only demarcate some or certain several be inadequate.
Summary of the invention
The present invention is directed to the deficiency of current technology, on the basis based on Metal Ball RCS calibration, utilize high-precision GPS module to record Metal Ball position, from time domain and frequency domain two aspects, radar is analyzed, the computing method adopting multiple spot to merge when impact point calculates, guarantee the accuracy of radar result of calculation.The all parameters of the present invention to dual-polarization weather radar carry out calibration, still can normally use when Metal Ball is moved.
For solving the problems of the technologies described above, the technical scheme of the dual-polarization weather radar Calibration Method based on on-fixed Metal Ball of the present invention is:
According to radar position, determine calibration place, record radar site and the longitude and latitude of calibration position;
According to the longitude and latitude obtained and radar station height, calculating Metal Ball relative to the possible orientation of radar, the elevation angle and distance, arranges the scanning elevation angle and the scan mode of radar when calibration state;
Utilize in calibration region equipment to rise Metal Ball, arrange high-precision GPS module bottom Metal Ball, control radar carries out work according to the scan mode preset simultaneously, the I/Q data of record radar and base data; The equipment rising Metal Ball used can adopt traditional balloon, also can adopt unmanned plane, and best employing is kite.Because kite does not have the impact of flying power substantially, simultaneously kite aloft can well holding position, can not produce significantly drift.Find kite to the RCS of Metal Ball without impact in reality test, solve problem when using balloon radar calibration being had to considerable influence.Coordinate high-precision GPS module testing precision more accurate.
Analyze I/Q data and base data, find the Metal Ball target of radar detection, compare with theoretical value, calculate the error of measured value and theoretical value, according to error result, radar is revised.
The inventive method is simple and easy to do compared with the beneficial effect of the method for prior art, can do precise calibration to radar complete machine; Improve the precision of calculating, solve radar parameter calibration problem when Metal Ball moves, calibration can be carried out to all detection parameters of polarimetric radar.
Figure of description
Fig. 1 be Metal Ball relative to radar orientation and the elevation angle calculate;
Fig. 2 is the FFT frequency spectrum of Metal Ball place range unit;
Fig. 3 is the base data at adjacent several elevation angle, Metal Ball position;
Fig. 4 is Metal Ball reflectivity factor and the theoretical value contrast of radar detection;
Fig. 5 be radar detection to multiple body bronzings belong to spherical aberration sub reflector rate;
Fig. 6 be radar detection to multiple bodies sweep Metal Ball related coefficient;
Fig. 7 be radar detection to multiple body bronzings belong to spherical aberration point propagation phase-shift.
Embodiment
For the detailed description of a kind of dual-polarization weather radar calibration scheme based on on-fixed Metal Ball of the present invention, specifically comprise the steps:
According to radar longitude and latitude and height, select suitable calibration position, require that this position does not have obvious atural object to block, and distance radar station not far.The selection of calibration position is successfully vital for radar calibration, if calibration positional distance radar is too far away, because Metal Ball can only be raised to certain altitude, observes at radar by with the very low elevation angle, is unfavorable for so very much the determination of target.Require there is no more blocking near calibration position, as targets such as the woods, steel tower, massifs simultaneously.After determining region, just can according to the position calculation Metal Ball of this position and radar may the orientation at place, the elevation angle and distance, utilize these data to arrange scan mode and the signal processing mode of radar.
According to possible maximum height after Metal Ball lift-off, calculate this position relative to the possible orientation of radar, the elevation angle and distance, working method and the scan mode of radar are set accordingly; Calculate Metal Ball relative to after the possible position of radar, scan mode and the signal processing mode of radar just can be set according to position, if conditions permit, preferably use fan sweeping pattern, unnecessary data record can be reduced like this.
In calibration region, rise Metal Ball with kite, add high-precision GPS module bottom this ball, be used for recording the position of Metal Ball, control radar works according to predetermined scan pattern.
Observe calibration region, after finding target, stably record I/Q data and the base data of a period of time; When carrying out calibration, first rise Metal Ball in calibration region, open radar simultaneously, scan according to preset mode.Metal Ball is easy to observe Metal Ball target, now will guarantees base data and I/Q data all normal storage after rising on radar.I/Q data can be used for confirming the position of Metal Ball and intensity from frequency spectrum aspect, and base data is used for the theoretical value of result that comparison radar calculates and Metal Ball itself, calculates the error of the two.
The result of Analysis of Radar record, the theoretical value calculated with Metal Ball is compared, and calculates the measuring error of radar, calibrates according to error amount to radar.The calculating of Metal Ball reflectivity factor theoretical value is very crucial step in this step, suppose that the radius of Metal Ball is r (m), radar transmitter peak power is Pt (Kw), antenna gain is G, receiver noise factor is NF (dB), the bandwidth of receiver is BW (MHz), radar wavelength is λ (m), feeder loss is L (dB), the detectable intensity at radar 1Km place is dBZ0, the distance of Metal Ball and radar is R (Km), then according to reflectivity prisoner of following formulae discovery Metal Ball:
RCS＝π×r
2
SNR＝10×log(Pr*1000)-(-114+NF+10×log BW)
Wherein, RCS is the radar reflection cross section of Metal Ball, and Pr is the power that radar receiver receives, and dBZ is final reflectivity factor result of calculation.When analyzing data, because Metal Ball can move, therefore from time domain and frequency domain two aspects, data being processed, solving the matching problem of data and impact point.
After data record completes, analyzing of Calibration Data will be carried out.The reflectivity factor of Metal Ball itself can pass through above-described formulae discovery, and other polarization parameters, because Metal Ball is spheroid, reflectance difference rate and difference travel phase shift theoretical value are 0, and its related coefficient theoretical value is 1.Because Metal Ball can move, therefore can analyze from frequency domain aspect.What Fig. 2 calculated is the frequency spectrum of the Metal Ball position that radar detection is arrived, and horizontal ordinate is the port number of FFT, and ordinate is amplitude, therefrom can obtain the position at Metal Ball place.The base data at what Fig. 3 represented is several elevation angle near Metal Ball position, horizontal ordinate is orientation, and ordinate is distance.What Fig. 4 to Fig. 7 then represented respectively is that multiple body sweeps the reflectivity factor measured value of the Metal Ball that lower radar detection is arrived and theoretical value contrasts and the reflectance difference rate of actual measurement, related coefficient and difference travel phase shift, its horizontal ordinate is that body sweeps number of times, and ordinate is respective parameter.By analyzing, the error of radargrammetry parameter just can be known.
Claims (3)
1., based on a dual-polarization weather radar Calibration Method for on-fixed Metal Ball, it is characterized in that comprising following steps:
According to radar position, determine calibration place, record radar site and the longitude and latitude of calibration position;
According to the longitude and latitude obtained and radar station height, calculating Metal Ball relative to the possible orientation of radar, the elevation angle and distance, arranges the scanning elevation angle and the scan mode of radar when calibration state;
Utilize in calibration region equipment to rise Metal Ball, arrange high-precision GPS module bottom Metal Ball, control radar carries out work according to the scan mode preset simultaneously, the I/Q data of record radar and base data;
Analyze I/Q data and base data, find the Metal Ball target of radar detection, compare with theoretical value, calculate the error of measured value and theoretical value, according to error result, radar is revised.
2. a kind of dual-polarization weather radar Calibration Method based on on-fixed Metal Ball as claimed in claim 1, is characterized in that described scan mode is fan sweeping pattern.
3. a kind of dual-polarization weather radar Calibration Method based on on-fixed Metal Ball as claimed in claim 1 or 2, is characterized in that described rise Metal Ball equipment is unmanned plane or balloon or kite.
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| CN201510036477.XA CN104678369A (en) | 2015-01-20 | 2015-01-20 | Dual-polarization weather radar calibration method based on non-fixed metal ball |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106772296A (en) * | 2017-01-20 | 2017-05-31 | 南京大学 | Meteorological radar echo intensity calibration device and method |
| CN107037414A (en) * | 2017-06-22 | 2017-08-11 | 雷象科技（北京）有限公司 | It is imaged positioning metal ball radar calibration method |
| CN107037415A (en) * | 2017-06-22 | 2017-08-11 | 雷象科技（北京）有限公司 | From record position radar calibration metal ball |
| CN107843884A (en) * | 2017-09-13 | 2018-03-27 | 成都信息工程大学 | The method for improving the Thunderstorm Weather early-warning and predicting degree of accuracy is observed based on dual polarization radar |
| CN107976657A (en) * | 2016-10-25 | 2018-05-01 | 通用汽车环球科技运作有限责任公司 | Radar calibration is carried out using the known global location of stationary objects |
| CN109270536A (en) * | 2018-10-31 | 2019-01-25 | 安徽四创电子股份有限公司 | A kind of signal processor of Doppler radar |
| CN109490858A (en) * | 2018-11-06 | 2019-03-19 | 浙江大华技术股份有限公司 | A kind of thunder ball sizing system and method |
| CN110068803A (en) * | 2019-04-16 | 2019-07-30 | 北京遥感设备研究所 | A kind of aerial bracketing device and method of radar equipment |
| CN110596666A (en) * | 2019-11-04 | 2019-12-20 | 北京敏视达雷达有限公司 | Deviation calibration method and device for radar differential reflectivity |
| CN111239741A (en) * | 2020-01-21 | 2020-06-05 | 航天新气象科技有限公司 | Phased array weather radar polarization control method and phased array weather radar system |
| CN111537965A (en) * | 2020-04-28 | 2020-08-14 | 中国气象局气象探测中心 | Weather radar calibration method and system based on unmanned aerial vehicle |
| CN112363129A (en) * | 2020-11-03 | 2021-02-12 | 江苏省气象探测中心(江苏省(金坛)气象综合试验基地) | Weather radar differential reflectivity factor parameter calibration method |
| CN113687324A (en) * | 2021-10-26 | 2021-11-23 | 南京恩瑞特实业有限公司 | Phased array weather radar calibration machine external verification system |
| CN114756045A (en) * | 2022-05-18 | 2022-07-15 | 电子科技大学 | Unmanned aerial vehicle control method for meteorological radar calibration |
| CN115061105A (en) * | 2022-06-30 | 2022-09-16 | 广东纳睿雷达科技股份有限公司 | Rapid calibration method and device for dual-polarization radar and storage medium |
| CN115356696A (en) * | 2022-07-30 | 2022-11-18 | 中国气象局气象探测中心 | Weather radar signal processing system algorithm calibration method and device |
| CN117419681A (en) * | 2023-12-18 | 2024-01-19 | 华云敏视达雷达(北京)有限公司 | Positioning processing method, system, storage medium and electronic equipment |
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| CN106772296A (en) * | 2017-01-20 | 2017-05-31 | 南京大学 | Meteorological radar echo intensity calibration device and method |
| CN106772296B (en) * | 2017-01-20 | 2023-11-07 | 南京大学 | Meteorological radar echo intensity calibration device and method |
| CN107037414A (en) * | 2017-06-22 | 2017-08-11 | 雷象科技（北京）有限公司 | It is imaged positioning metal ball radar calibration method |
| CN107037415A (en) * | 2017-06-22 | 2017-08-11 | 雷象科技（北京）有限公司 | From record position radar calibration metal ball |
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| CN107843884A (en) * | 2017-09-13 | 2018-03-27 | 成都信息工程大学 | The method for improving the Thunderstorm Weather early-warning and predicting degree of accuracy is observed based on dual polarization radar |
| CN107843884B (en) * | 2017-09-13 | 2021-09-14 | 成都信息工程大学 | Method for improving accuracy of thunderstorm weather early warning forecast based on dual-polarization radar observation |
| CN109270536B (en) * | 2018-10-31 | 2020-09-01 | 安徽四创电子股份有限公司 | Signal processor of Doppler weather radar |
| CN109270536A (en) * | 2018-10-31 | 2019-01-25 | 安徽四创电子股份有限公司 | A kind of signal processor of Doppler radar |
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| CN110596666A (en) * | 2019-11-04 | 2019-12-20 | 北京敏视达雷达有限公司 | Deviation calibration method and device for radar differential reflectivity |
| CN111239741A (en) * | 2020-01-21 | 2020-06-05 | 航天新气象科技有限公司 | Phased array weather radar polarization control method and phased array weather radar system |
| CN111537965A (en) * | 2020-04-28 | 2020-08-14 | 中国气象局气象探测中心 | Weather radar calibration method and system based on unmanned aerial vehicle |
| CN111537965B (en) * | 2020-04-28 | 2020-11-03 | 中国气象局气象探测中心 | Weather radar calibration method and system based on unmanned aerial vehicle |
| CN112363129A (en) * | 2020-11-03 | 2021-02-12 | 江苏省气象探测中心(江苏省(金坛)气象综合试验基地) | Weather radar differential reflectivity factor parameter calibration method |
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| CN115061105A (en) * | 2022-06-30 | 2022-09-16 | 广东纳睿雷达科技股份有限公司 | Rapid calibration method and device for dual-polarization radar and storage medium |
| CN115356696A (en) * | 2022-07-30 | 2022-11-18 | 中国气象局气象探测中心 | Weather radar signal processing system algorithm calibration method and device |
| CN117419681A (en) * | 2023-12-18 | 2024-01-19 | 华云敏视达雷达(北京)有限公司 | Positioning processing method, system, storage medium and electronic equipment |
| CN117419681B (en) * | 2023-12-18 | 2024-03-08 | 华云敏视达雷达(北京)有限公司 | Positioning processing method, system, storage medium and electronic equipment |
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Application publication date: 20150603 |