CN112166700B - Weighting method for eliminating antenna sum and difference beam puncturing phenomenon - Google Patents
Weighting method for eliminating antenna sum and difference beam puncturing phenomenon Download PDFInfo
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- CN112166700B CN112166700B CN200910122084.5A CN200910122084A CN112166700B CN 112166700 B CN112166700 B CN 112166700B CN 200910122084 A CN200910122084 A CN 200910122084A CN 112166700 B CN112166700 B CN 112166700B
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Abstract
The invention discloses a differential beam aperture weighting method for eliminating the phenomena of antenna and differential beam puncturing. The weighting method comprises the following steps: when the aperture of the difference wave beam is distributed, the sum of the input power of the two radiation units at the center of the antenna is larger than the sum of the input power of the other radiation units at the two sides, and the input power distribution of the other radiation units at the two sides is Taylor weighted distribution; and the input power values of the central two radiation units can be adjusted. The distribution can slow down the descending trend of the side lobe level of the difference wave beam, improve the side lobe coverage of the difference wave beam and the effect of the side lobe level of the wave beam, eliminate the phenomenon of sum-difference wave beam puncture and further improve the performance of the radar system.
Description
Technical Field
The invention belongs to the technical field of antennas, and particularly relates to an antenna aperture weighting method for a differential beam.
Background
In the field of identification and navigation management of the enemy and the my, the antenna works in a sum-difference system working mode, namely the antenna can form a sum beam and a difference beam. And the wave beam transmits an inquiry pulse signal and receives a response pulse signal; and the poor beam receiving response pulse signal is used for receiving side lobe suppression, and the poor beam side lobe coverage and the beam side lobe are preconditions for receiving side lobe suppression. If the poor beam sidelobe cannot cover the sum beam sidelobe, a sum and poor beam puncturing phenomenon is formed.
At present, there are two main antenna aperture weighting methods for forming a difference beam.
The first method comprises the following steps: when forming sum wave beams, the amplitude weighting of each radiation unit of the antenna aperture is distributed according to Taylor, and the phase distribution is the same; when forming the difference wave beam, the amplitude weighting of each radiation element of the antenna aperture is distributed according to Taylor, but the left and right parts of the phase distribution are opposite. The weighting distribution causes that the difference beam depends on the aperture distribution of the sum beam, when the sum beam forms amplitude weighting distribution according to certain requirements, the shape of the difference beam is determined accordingly, the difference beam cannot be improved, the side lobe level of the difference beam has a severe descending trend, and the side lobe coverage and side lobe level effects of the difference beam are poor.
And the second method comprises the following steps: the aperture distribution for forming the difference beam adopts the belief distribution, the gain of the difference beam formed by the distribution is higher, but the side lobe level is very low, and a plurality of pits exist at the side lobe position, so that the side lobe level of the sum beam cannot be covered.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a weighting method for eliminating the phenomena of antenna and poor beam puncturing.
The weighting method for eliminating the phenomena of antenna and difference beam puncture comprises the following contents:
when the aperture of the difference wave beam is distributed, the sum of the input power of the two radiation units at the center of the antenna is larger than the sum of the input power of the other radiation units at the two sides, and the input power distribution of the other radiation units at the two sides is Taylor weighted distribution; and the input power values of the central two radiation units can be adjusted.
When the aperture of the difference beam is distributed, the sum of the input power of the two radiation units in the center of the antenna is 4 times of the sum of the input power of the other radiation units on the two sides.
The weighting method further comprises the following feeding network connection:
the sum port of the antenna is connected with the input port of the coupler, two output ports of the coupler are respectively connected with the input ports of the two ring bridges, and the output port of one ring bridge I is connected with the radiation unit; and the output port of the other ring bridge II is respectively connected with the input ports of the left power divider and the right power divider, and the output ports of the left power divider and the right power divider are respectively connected with the radiation unit.
The difference port of the antenna is connected with the input port of the central power divider, two output ports of the central power divider are respectively connected with the input ports of two annular bridges, and the output port of one annular bridge is connected with the radiation unit; the output port of the other ring bridge is respectively connected with the input ports of the left power divider and the right power divider, and the output ports of the left power divider and the right power divider are respectively connected with the radiation unit.
The poor wave beam formed by the weighting method has gentle descending trend of the side lobe level, not only can cover the side lobe level of the sum wave beam, but also has the side lobe level at least 6dB greater than the side lobe level of the sum wave beam, and can effectively eliminate the phenomena of antenna and poor wave beam puncture, thereby improving the overall performance of the radar. The invention is suitable for sum and difference antennas of various platforms.
Drawings
The present invention will be described in further detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of the principle of the connection mode of the antenna feed network in the present invention.
Fig. 2 is a sum beam taylor weight distribution diagram.
Fig. 3 is a weighting profile of a difference beam obtained by the present invention.
Fig. 4 is a sum and difference beam pattern formed by a conventional weighting method.
Fig. 5 is a sum and difference beam pattern obtained using the present invention.
In the figure, 1, a radiation unit 2, a central power divider 3, a coupler 4, a ring bridge I5, a left power divider 6, a right power divider 7, a sum port 8, a difference port 9, a sum beam 10, a difference beam 14 and a ring bridge II
Detailed Description
Fig. 1 is a schematic diagram of the connection mode of the antenna feed network of the present invention. The radiation units 1 are arranged at equal intervals according to about one-half wavelength, the sum port 7 of the antenna is connected with the input port of the coupler 3, two output ports of the coupler 3 are respectively connected with the input ports of two loop bridges, and the output port of one loop bridge I4 is connected with the radiation unit 1; the output port of the other ring bridge II14 is connected to the input ports of the left power divider 5 and the right power divider 6, respectively, and the output ports of the left power divider 5 and the right power divider 6 are connected to the radiation unit 1, respectively.
A difference port 8 of the antenna is connected with an input port of the central power divider 2, two output ports of the central power divider 2 are respectively connected with input ports of two loop bridges, and an output port of one loop bridge I4 is connected with the radiation unit 1; the output port of the other ring bridge II14 is connected to the input ports of the left power divider 5 and the right power divider 6, respectively, and the output ports of the left power divider 5 and the right power divider 6 are connected to the radiation unit 1, respectively.
The feed network connection mode principle schematic diagram can realize the weighting mode of the invention. When the sum port 7 is used for input, microwave signals are output to the radiation unit 1 through the coupler 3, the ring bridge, the left power divider 5 and the right power divider 6, and the power distribution of each input port realizes Taylor weighted distribution. Fig. 2 is a distribution diagram of taylor weighting of the sum beam, which is characterized in that: the power of the radiation unit 1 in the center of the antenna is the maximum, the input power of the radiation units 1 from the center to two sides is reduced in sequence, and the input power of the radiation units 1 at symmetrical positions on two sides of the antenna is the same.
When the difference port 8 inputs the microwave signal, the microwave signal is output to the radiation unit 1 through the central power divider 2, the ring bridge, the left power divider 5 and the right power divider 6, and the power distribution of each input port realizes the weighted distribution of the invention. Fig. 3 is a weighting distribution diagram of the difference beam obtained by the present invention, which is characterized in that: the sum of the input power of the two radiation units 1 in the center of the antenna is larger than the sum of the input power of the other radiation units 1 on two sides, and the input power distribution of the other radiation units 1 on two sides is Taylor weighted distribution. And the larger the input power of the central two radiation units 1 is, the gentler the descending trend of the weighted difference beam sidelobe level is, and the better the covering effect on the sum beam sidelobe level is. The typical value of the power distribution of the weighting method of the present invention is that the sum of the input powers of the central two radiation units 1 is 4 times of the sum of the input powers of the other radiation units 1 on both sides, that is, the power distribution ratio of the central power divider 2 is 4: 1, the power distribution ratio of the central power divider 2 can be adjusted in the antenna design, and the descending trend of the side lobe level of the antenna difference wave beam is simply and conveniently improved.
Fig. 4 is a sum-difference beam diagram formed by a traditional weighting method, the side lobe level of the difference beam 10 drops sharply, and the side lobe coverage and side lobe level of the beam 9 have poor effect.
Fig. 5 is a sum-difference beam diagram obtained by the present invention, the side lobe level of the difference beam 10 has a relatively gentle downward trend, the coverage degree of the side lobe level of the sum beam 9 is also improved, and the side lobe level of the difference beam 10 is at least 12dB greater than the side lobe level of the sum beam 9.
Claims (3)
1. A weighting method for eliminating antenna and difference beam puncturing phenomena is characterized in that the weighting method comprises the following contents:
when the aperture of the difference wave beam is distributed, the sum of the input power of the two radiation units at the center of the antenna is larger than the sum of the input power of the other radiation units at the two sides, and the input power distribution of the other radiation units at the two sides is Taylor weighted distribution; and the input power values of the central two radiation units can be adjusted.
2. The weighting method for eliminating the antenna and differential beam puncturing phenomenon according to claim 1, wherein: when the aperture of the difference beam is distributed, the sum of the input power of the two radiation units in the center of the antenna is 4 times of the sum of the input power of the other radiation units on the two sides.
3. The weighting method for eliminating the antenna and difference beam puncturing phenomenon according to claim 1, wherein the weighting method further comprises the following feeding network manner:
the sum port (7) of the antenna is connected with the input port of the coupler (3), one output port of the coupler (3) is connected with the input port A of the ring bridge I (4), and the other output port of the coupler (3) is connected with the input port A of the ring bridge II (14); the output port of the ring bridge I (4) is connected with the radiation unit (1); the output port of the ring bridge II (14) is respectively connected with the input ports of the left power divider (5) and the right power divider (6), and the output ports of the left power divider (5) and the right power divider (6) are respectively connected with the radiation unit (1);
a difference port (8) of the antenna is connected with an input port of the central power divider (2), one output port of the central power divider (2) is connected with an input port B of the ring bridge I (4), and the other output port of the central power divider (2) is connected with an input port B of the ring bridge II (14); the output port of the ring bridge I (4) is connected with the radiation unit (1); the output port of the ring bridge II (14) is respectively connected with the input ports of the left power divider (5) and the right power divider (6), and the output ports of the left power divider (5) and the right power divider (6) are respectively connected with the radiation unit (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910122084.5A CN112166700B (en) | 2009-07-16 | 2009-07-16 | Weighting method for eliminating antenna sum and difference beam puncturing phenomenon |
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| CN200910122084.5A CN112166700B (en) | 2009-07-16 | 2009-07-16 | Weighting method for eliminating antenna sum and difference beam puncturing phenomenon |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110609261A (en) * | 2019-07-31 | 2019-12-24 | 四川九洲电器集团有限责任公司 | Multi-element multi-domain integrated target identification method, device and system |
| CN111052509A (en) * | 2017-08-30 | 2020-04-21 | 株式会社村田制作所 | Antenna module |
-
2009
- 2009-07-16 CN CN200910122084.5A patent/CN112166700B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111052509A (en) * | 2017-08-30 | 2020-04-21 | 株式会社村田制作所 | Antenna module |
| CN110609261A (en) * | 2019-07-31 | 2019-12-24 | 四川九洲电器集团有限责任公司 | Multi-element multi-domain integrated target identification method, device and system |
| CN110609261B (en) * | 2019-07-31 | 2024-03-26 | 四川九洲电器集团有限责任公司 | Multi-element multi-domain integrated target identification method, device and system |
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Granted publication date: 20131002 Termination date: 20210716 |
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