CN110609286A - Processing method for intelligently eliminating radar ground clutter - Google Patents
Processing method for intelligently eliminating radar ground clutter Download PDFInfo
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- CN110609286A CN110609286A CN201810612305.6A CN201810612305A CN110609286A CN 110609286 A CN110609286 A CN 110609286A CN 201810612305 A CN201810612305 A CN 201810612305A CN 110609286 A CN110609286 A CN 110609286A
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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
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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
- G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
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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)
- Electromagnetism (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a processing method for intelligently eliminating radar ground clutter. Through the formation and change information of the ground clutter acquired in real time, the processing method intelligently adjusts the radar operation related parameters and the radar operation state, can cleanly eliminate the radar ground clutter in the radar detection range, and ensures that the base data output by the radar has no ground clutter information.
Description
Technical Field
The invention belongs to the field of atmospheric science, and particularly relates to a method for eliminating the influence of ground objects on meteorological targets in radar detection.
Background
The weather radar detects cloud and rain echoes by transmitting electromagnetic waves and receiving electromagnetic wave signals reflected by a detection space, and any target object in the detection wave beam range can generate reflected echo signals. Ground clutter is generated when radar echo signals caused by ground non-meteorological targets are processed into base data. The clutter of the ground objects has great influence on the further accurate analysis of the base data. Since all radar products and algorithms are built on base data, clutter of ground objects affects both the base product and the derived product. A particularly sensitive example is the impact on quantitative precipitation estimation.
After the radar position is determined, under the standard atmosphere condition, the position of the ground clutter should be relatively fixed, the edge is also relatively clear, and the ground clutter can be eliminated or suppressed by the ground echo component recorded when the clear day is deducted and a filter of a radar signal processor. However, in general, particularly in the case of precipitation, the atmosphere is not a standard atmosphere, and the radar beam is often refracted according to changes in factors such as temperature, humidity, and air pressure, and the position, shape, range, intensity, and the like of the ground clutter are greatly changed, and it is difficult to automatically and quickly eliminate or suppress the ground clutter.
The existing methods for eliminating or inhibiting radar ground clutter mainly comprise: deducting clutter components of the ground objects recorded in sunny days from mixed echoes of precipitation and the ground objects; eliminating ground clutter signals by using a signal selection system through rainfall echo signal characteristics with randomly changed amplitude; estimating approximately the average power of precipitation echoes from the amplitude variance of the linear detection signal independent of clutter; and identifying the precipitation echo according to the different Doppler frequency characteristics of the precipitation echo and the ground clutter. These methods also have difficulty in cleanly eliminating clutter from the terrain.
Disclosure of Invention
The invention provides a processing method for intelligently eliminating ground clutter of a radar, which can completely and cleanly eliminate the ground clutter.
The invention aims to provide a processing method for intelligently eliminating radar ground clutter.
The treatment process of the invention comprises the following steps:
1) acquiring an equal-beam height map or a block angle map of a radar position, and determining the lowest elevation angle without the influence of ground objects in each radial direction of radar azimuth scanning;
2) acquiring the maximum ground object inhibition capability of the radar signal processor;
3) when the radar carries out 360-degree azimuth scanning according to the lowest elevation angle, if no ground clutter occurs, outputting 360-degree scanning data of the radar without the ground clutter;
4) when the radar performs 360-degree azimuth scanning according to the lowest elevation angle, ground clutter still appears, and when the clutter intensity is smaller than the maximum ground suppression capability of the radar signal processor, the signal processor directly performs ground suppression and outputs radar 360-degree scanning data without the ground clutter;
5) when the radar scans the 360-degree azimuth according to the lowest elevation angle, ground clutter still occurs, when the clutter intensity is greater than or equal to the maximum ground suppression capability of the radar signal processor, the elevation angle of the radar antenna is raised at the azimuth where the clutter occurs until the clutter intensity is smaller than the maximum ground suppression capability of the radar signal processor, then the signal processor suppresses the ground clutter, and outputs the radar 360-degree scanning data without the ground clutter;
6) the process is ended.
The invention has the advantages that:
firstly, according to the main reason causing the formation of the clutter of the radar ground object, the method of elevating the elevation angle of the radar antenna can completely and cleanly eliminate the influence of the clutter of the ground object.
Secondly, the maximum ground object suppression capability of the radar signal processor is used as a threshold value threshold, the lowest detection elevation angle of the radar antenna can be determined intelligently, and the most useful detection information can be obtained.
Drawings
FIG. 1 is a flow chart of a processing method for intelligently eliminating radar ground clutter according to the present invention;
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
As shown in fig. 1, the processing method for intelligently eliminating radar ground clutter according to the present invention includes the following steps:
1. obtaining an equal-beam height map or a block angle map of a radar position, and determining the lowest elevation angle E without the influence of ground objects in each radial direction of radar azimuth scanningjWhere the subscript j is 1, 2 … … m, where m is the last radial number of 360 ° scans performed by the radar;
2. obtaining the maximum ground object inhibition capability R of the radar signal processorM，RMThe unit is decibel;
3. when the radar is according to the lowest elevation angle EjWhen 360-degree azimuth scanning is carried out, if no ground clutter appears, outputting radar 360-degree scanning data without the ground clutter;
4. when the radar is according to the lowest elevation angle EjWhen 360-degree azimuth scanning is carried out, ground clutter C still appearsj，CjThe clutter intensity is expressed in decibels, wherein a subscript j is 1, 2 … … m, and m is the last radial number of the radar completing 360-degree scanning; when C is presentj＜RMWhen the ground object is suppressed directly by the signal processor, and the ground object is outputOutputting radar 360-degree scanning data without ground clutter;
5. when the radar is according to the lowest elevation angle EjWhen 360-degree azimuth scanning is carried out, ground clutter C still appearsj，CjThe clutter intensity is expressed in decibels, wherein a subscript j is 1, 2 … … m, and m is the last radial number of the radar completing 360-degree scanning; when C is presentj≥RMAnd raising the elevation angle of the radar antenna at the jth radial position until reaching C at the jth radial positionj＜RM(ii) a Then, the signal processor suppresses the ground objects and outputs radar 360-degree scanning data without ground object clutter;
6. the process is ended.
Finally, it is noted that the disclosed embodiments are intended to aid in further understanding of the invention, but those skilled in the art will appreciate that: various substitutions and modifications are possible without departing from the spirit and scope of the invention and the appended claims. Therefore, the invention should not be limited to the embodiments disclosed, but the scope of the invention is defined by the appended claims.
Claims (3)
1. A processing method for intelligently eliminating radar ground clutter is a processing method based on an equal-beam height map or a baffle angle map of a radar array and the maximum ground suppression capability of a signal processor; the method is characterized in that the treatment process comprises the following steps:
1) obtaining an equal-beam height map or a block angle map of a radar position, and determining the lowest elevation angle E without the influence of ground objects in each radial direction of radar azimuth scanningjWherein the subscript j is 1, 2... m, and m is the last radial number of 360 ° scans completed by the radar;
2) obtaining the maximum ground object inhibition capability R of the radar signal processorM，RMThe unit is decibel;
3) when the radar is according to the lowest elevation angle EjWhen 360-degree azimuth scanning is carried out, if no ground clutter appears, outputting radar 360-degree scanning data without the ground clutter;
4) when the radar is according to the lowest elevation angle EjWhen 360-degree azimuth scanning is carried out, the sundries of the ground objects still appearWave Cj，CjThe unit of clutter intensity is decibels, wherein a subscript j is 1, 2. When C is presentj＜RMDirectly carrying out ground feature suppression by a signal processor and outputting radar 360-degree scanning data without ground feature clutter;
5) when the radar is according to the lowest elevation angle EjWhen 360-degree azimuth scanning is carried out, ground clutter C still appearsj，CjThe unit of clutter intensity is decibels, wherein a subscript j is 1, 2. When C is presentj≥RMAnd raising the elevation angle of the radar antenna at the jth radial position until reaching C at the jth radial positionj＜RM(ii) a Then, the signal processor suppresses the ground objects and outputs radar 360-degree scanning data without ground object clutter;
6) the process is ended.
2. The method as claimed in claim 1, wherein the radar includes various bands of radar with single polarization, dual polarization, multi-polarization technique and various polarization modes.
3. The method as claimed in claim 1, wherein the processing procedure includes both processing procedure of radar in radial direction one by one in 360 ° azimuth scanning; the method also comprises a processing process of secondary or multiple 360-degree azimuth scanning by raising the elevation angle of the radar antenna after the radar performs 360-degree azimuth scanning once.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810612305.6A CN110609286A (en) | 2018-06-14 | 2018-06-14 | Processing method for intelligently eliminating radar ground clutter |
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| CN201810612305.6A CN110609286A (en) | 2018-06-14 | 2018-06-14 | Processing method for intelligently eliminating radar ground clutter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112666559A (en) * | 2021-01-27 | 2021-04-16 | 苏州市气象局 | Doppler weather radar data quality control method |
| CN113253276A (en) * | 2021-04-30 | 2021-08-13 | 广东省气象探测数据中心 | Intelligent evaluation method and device for weather radar site selection |
| CN117214846A (en) * | 2023-11-09 | 2023-12-12 | 成都远望科技有限责任公司 | Detection method for near-ground detection blind area range of weather radar |
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| CN113253276A (en) * | 2021-04-30 | 2021-08-13 | 广东省气象探测数据中心 | Intelligent evaluation method and device for weather radar site selection |
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| CN117214846B (en) * | 2023-11-09 | 2024-01-30 | 成都远望科技有限责任公司 | Detection method for near-ground detection blind area range of weather radar |
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Application publication date: 20191224 |