CN115754911A - Sidelobe clutter suppression method for airborne weather radar - Google Patents
Sidelobe clutter suppression method for airborne weather radar Download PDFInfo
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- CN115754911A CN115754911A CN202211282677.XA CN202211282677A CN115754911A CN 115754911 A CN115754911 A CN 115754911A CN 202211282677 A CN202211282677 A CN 202211282677A CN 115754911 A CN115754911 A CN 115754911A
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Abstract
The invention provides a method for suppressing sidelobe clutter of airborne weather radar, which comprises the following steps: the method comprises the following steps that firstly, a phased array antenna is adopted to form a wide antenna directional diagram and a narrow antenna directional diagram, and the wide antenna directional diagram and the narrow antenna directional diagram can be switched in a time-sharing mode; determining scanning angles of the wide beam and the narrow beam according to the flying height of the carrier and the flying atmospheric environment and the ground environment; wherein, the narrow beam is used for meteorological detection, and the wide beam is used for topographic mapping; step three, transmitting electromagnetic waves according to the scanning pattern, and receiving echoes of the wide wave beam and the narrow wave beam; step four, calculating the echo power difference of the wide beam and the narrow beam of each distance unit, and deducting the echo of the distance unit of the narrow beam when the echo power difference of the wide beam and the narrow beam meets the set condition; and step five, after one antenna line scanning is completed by repeatedly executing the step three and the step four, converting the narrow beam echo into meteorological reflectivity and quantizing the meteorological reflectivity for display, and converting the wide beam echo into ground reflectivity and quantizing the ground reflectivity for display.
Description
Technical Field
The invention relates to the technical field of radars, in particular to a sidelobe clutter suppression method for airborne weather radar.
Background
When the aircraft flight height is lower or the flight area is in high backscattering region such as city, the side lobe clutter may appear in the radar picture, the side lobe clutter includes altitude line clutter and other side lobe clutter usually, because antenna side lobe vertical irradiation aircraft below during altitude line clutter, be circular-arc echo usually, the position is relevant with aircraft ground clearance, the altitude clutter appears and can predict with flight position ground height according to the height and the flight position ground height of aircraft flight for the position, other side lobe clutter can be that the beam side lobe directly shines the strong reflectivity district in ground or the secondary reflection obtains in the radar cover, consequently, it specifically appears to be difficult accurate judgement its position that appears, present airborne weather radar product does not have the side lobe suppression function, the appearance of side lobe clutter is confused with the weather echo very easily, form the interference to the pilot.
Disclosure of Invention
In view of this, embodiments of the present disclosure provide a method for suppressing sidelobe clutter of airborne weather radar, so as to reduce the influence of the sidelobe clutter on flight.
The embodiment of the specification provides the following technical scheme: a sidelobe clutter suppression method for airborne weather radar comprises the following steps: the method comprises the following steps that firstly, a phased array antenna is adopted to form a wide antenna directional diagram and a narrow antenna directional diagram, and the wide antenna directional diagram and the narrow antenna directional diagram can be switched in a time-sharing mode; determining the scanning angles of the wide beam and the narrow beam according to the flying height of the aircraft, the flying atmospheric environment and the ground environment; wherein, the narrow beam is used for meteorological detection, and the wide beam is used for topographic mapping; step three, transmitting electromagnetic waves according to the scanning pattern, and receiving echoes of the wide wave beam and the narrow wave beam; step four, calculating the echo power difference of the wide beam and the narrow beam of each distance unit, and deducting the echo of the distance unit of the narrow beam when the echo power difference of the wide beam and the narrow beam meets the set condition; and step five, after one antenna line scanning is completed by repeatedly executing the step three and the step four, converting the narrow beam echo into meteorological reflectivity and quantizing the meteorological reflectivity for display, and converting the wide beam echo into ground reflectivity and quantizing the ground reflectivity for display.
Further, the second step is specifically as follows: by the formula
And
determining the scanning angles of the wide beam and the narrow beam, wherein Hp is the flying height, H0 is the atmospheric zero-degree height, hg is the average ground height, and R D To display the range.
Further, the third step is specifically: and performing azimuth scanning by adopting dual beams in cooperation, firstly performing narrow-beam electromagnetic wave transmission on each azimuth line, and then performing wide-beam electromagnetic wave transmission, wherein the received echo is sampled and recorded as S0 (nr), and the received echo is sampled and recorded as S1 (nr), and the nr is a range gate number.
Further, the fourth step includes: and comparing the data of the S0 (nr) and the data of the S1 (nr) one by one, and performing side lobe clutter identification according to the power difference between the S0 (nr) and the S1 (nr).
Further, the fourth step is specifically:
step 4.1, passing formula
Calculating an angle of the nr-th range gate relative to the aircraft;
step 4.2, passing through the formula
Calculating theoretical echo difference of a main lobe echo and a side lobe echo of the wide and narrow wave beams;
and 4.3, calculating the actual echo difference of the main lobe echo and the side lobe echo of the wide and narrow beam by a formula Pdif _ S _ dB =20log10 (S0 (nr) -S1 (nr)).
Step 4.4: when abs (Pdif _ S _ dB-Pmdif _ dB) > T1 and abs (Pdif _ S _ dB-Psdif _ dB) < T2 are simultaneously satisfied, a sidelobe echo is identified.
Compared with the prior art, the beneficial effects that can be achieved by the at least one technical scheme adopted by the embodiment of the specification at least comprise: the airborne weather radar meteorological detection and the terrain detection are combined, the sensing of weather and terrain situation in a large range in front of the aircraft is guaranteed, the suppression of sidelobe clutter is realized, the flight safety can be further improved, and unnecessary yawing is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow diagram of an embodiment of the present invention;
FIG. 2 illustrates two antenna patterns of a wide antenna pattern and a narrow antenna pattern according to an embodiment of the present invention;
FIG. 3 is a weather display prior to sidelobe suppression in accordance with an embodiment of the present invention;
FIG. 4 is a weather display graph after sidelobe suppression according to an embodiment of the present invention;
FIG. 5 is a ground display diagram of an embodiment of the present invention.
Detailed Description
The embodiments of the present application will be described in detail below with reference to the accompanying drawings.
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 to 5, an embodiment of the present invention provides a method for suppressing sidelobe clutter of an airborne weather radar, including:
1. a phased array antenna is adopted, and the phase and the power of the TR component are adjusted to form wide and narrow beams. The narrow beam directional diagram has 3dB width Bw0 of a main beam, main lobe gain Fm0 and average side lobe gain Fs0; the wide beam directional diagram main beam 3dB width Bw1 and the main lobe gain Fm1.
The narrow beam is a pencil beam, and the wide beam may be any beam shape satisfying the following conditions, such as a beam shape of cosecant. The width of the wide beam 3dB is not less than 40 degrees; the wide beam main lobe gain Fm1 is at least 3dB less than the narrow beam main lobe gain Fm 0; the wide beam main lobe gain Fm1 is at least 10dB greater than the narrow beam average side lobe gain Fs 0.
2. Determining the pitch angle of the wide and narrow beams, the pitch angle E0 of the narrow beam antenna and the pitch angle E1 of the wide beam antenna according to the height of the carrier and the height of the terrain, wherein the calculation method comprises the following steps:
wherein Hp is the flying height, H0 is the atmospheric zero degree height, hg is the average ground height, R D To display the range.
3. And the double beams cooperatively perform azimuth scanning, from-AZ scanning to + AZ scanning, at each azimuth line, firstly performing narrow-beam electromagnetic wave transmission, and performing wide-beam electromagnetic wave transmission after receiving echo samples recorded as S0 (nr), wherein the received echo samples are recorded as S1 (nr), the nr is a range gate number, and nr =1: nr. The meteorological detection effect is as shown in figure 3.
4. Comparing the data of S0 and S1 one by one, and recording the distance of the nth range gate as R nr And performing side lobe clutter identification according to the power difference between the S0 and the S1.
1) Calculating the angle of the stable system of the nr-th range gate:
2) Calculating theoretical values of a main lobe echo and a side lobe echo of the wide and narrow wave beams:
Pmdif_dB＝(Fm0(El nr -E0)-Fm1(El nr -E1))*2
Psdif_dB＝(Fs0-Fm1(El nr -E1))*2；
3) Calculating the actual echo difference:
Pdif_S_dB＝20log10(S0(nr)-S1(nr))；
4) And (3) side lobe identification:
if abs (Pdif _ S _ dB-Pmdif _ dB) > T1;
and abs (Pdif _ S _ dB-Psdif _ dB) < T2;
and TI and T2 are error tolerance values, and are generally not more than 6dB, the nth range gate echo is judged to be a side lobe echo, S0 (nr) is set to be 0, and the side lobe clutter echo is deducted.
5. And respectively carrying out meteorological processing and topographic mapping processing on the S0 and the S1, carrying out quantitative display after finishing azimuth scanning of one antenna, and realizing meteorological detection and topographic mapping picture display, as shown in fig. 4 and 5.
The invention provides a method for suppressing sidelobe clutter of an airborne weather radar, aiming at the problems that the identification of the sidelobe clutter of the airborne weather radar is difficult and the airborne weather radar product does not have the sidelobe clutter suppression function.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features, the technical schemes and the technical schemes can be freely combined and used.
Claims (5)
1. A sidelobe clutter suppression method for airborne weather radar is characterized by comprising the following steps:
the method comprises the following steps that firstly, a phased array antenna is adopted to form a wide antenna directional diagram and a narrow antenna directional diagram, and the wide antenna directional diagram and the narrow antenna directional diagram can be switched in a time-sharing mode;
determining the scanning angles of the wide beam and the narrow beam according to the flying height of the aircraft, the flying atmospheric environment and the ground environment; wherein, the narrow beam is used for meteorological detection, and the wide beam is used for topographic mapping;
step three, transmitting electromagnetic waves according to the scanning pattern, and receiving echoes of the wide wave beam and the narrow wave beam;
step four, calculating the echo power difference of the wide beam and the narrow beam of each distance unit, and deducting the echo of the distance unit of the narrow beam when the echo power difference of the wide beam and the narrow beam meets the set condition;
and step five, after one antenna line scanning is completed by repeatedly executing the step three and the step four, converting the narrow beam echo into meteorological reflectivity and quantizing the meteorological reflectivity for display, and converting the wide beam echo into ground reflectivity and quantizing the ground reflectivity for display.
2. The method for suppressing sidelobe clutter of an airborne weather radar according to claim 1, wherein the second step is specifically: by the formula
And
determining the scanning angles of the wide beam and the narrow beam, wherein Hp is the flying height, H0 is the atmospheric zero-degree height, hg is the average ground height, and R D To display the range.
3. The sidelobe clutter suppression method for the airborne weather radar according to claim 2, wherein the third step is specifically: and performing azimuth scanning by adopting dual beams in cooperation, firstly performing narrow-beam electromagnetic wave transmission on each azimuth line, and then performing wide-beam electromagnetic wave transmission, wherein the received echo is sampled and recorded as S0 (nr), and the received echo is sampled and recorded as S1 (nr), and the nr is a range gate number.
4. The method for sidelobe clutter suppression of airborne weather radar according to claim 3, wherein said step four comprises: and comparing the data of the S0 (nr) and the data of the S1 (nr) one by one, and performing side lobe clutter identification according to the power difference between the S0 (nr) and the S1 (nr).
5. The sidelobe clutter suppression method for the airborne weather radar according to claim 4, wherein the fourth step is specifically:
step 4.1, passing formula
Calculating an angle of the nr-th range gate relative to the aircraft;
step 4.2, passing through the formula
Calculating theoretical echo difference of a main lobe echo and a side lobe echo of the wide and narrow wave beams;
and 4.3, calculating the actual echo difference of the main lobe echo and the side lobe echo of the wide and narrow beam by a formula Pdif _ S _ dB =20log10 (S0 (nr) -S1 (nr)).
Step 4.4: when abs (Pdif _ S _ dB-Psdif _ dB) > T1 and abs (Pdif _ S _ dB-Psdif _ dB) < T2 are simultaneously satisfied, a sidelobe echo is identified.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117805742A (en) * | 2024-02-28 | 2024-04-02 | 浙江宜通华盛科技有限公司 | Design method of phased array weather radar and its scanning mode |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117805742A (en) * | 2024-02-28 | 2024-04-02 | 浙江宜通华盛科技有限公司 | Design method of phased array weather radar and its scanning mode |
| CN117805742B (en) * | 2024-02-28 | 2024-05-14 | 浙江宜通华盛科技有限公司 | Phased array weather radar and design method of scanning mode thereof |
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