CN107729627B - Quick selection method for unit of opportunistic array antenna - Google Patents
Quick selection method for unit of opportunistic array antenna Download PDFInfo
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- CN107729627B CN107729627B CN201710881880.1A CN201710881880A CN107729627B CN 107729627 B CN107729627 B CN 107729627B CN 201710881880 A CN201710881880 A CN 201710881880A CN 107729627 B CN107729627 B CN 107729627B
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Abstract
The invention discloses a method for quickly selecting units of an opportunistic array antenna, which solves the problem that the conventional opportunistic array antenna units are difficult to quickly select. The realization comprises the following steps: setting parameters; determining the beam width, namely determining the half-power beam width through unit simulation; setting an initial value of an optional antenna unit; solving a normal vector outside the unit to serve as an antenna radiation direction; calculating an included angle between the maximum radiation direction and the beam pointing direction, wherein the included angle is used as a selection basis; whether the antenna unit is selected for comparison and judgment is judged, and the calculated included angle is within the range of half of the half-power beam width to meet the requirement of selecting the antenna unit; judging whether the searching is finished or not, and detecting whether all the antenna units are searched or not; and obtaining the proper antenna unit quickly until the antenna unit is selected. The invention combines the radiation pattern of the antenna unit, accurately and quickly selects the radiation unit under a given scanning angle, realizes high-speed and effective unit selection, and is used for the radar and various detection fields utilizing the antenna.
Description
Technical Field
The invention belongs to the technical field of antennas, and mainly relates to rapid extraction of a radar antenna unit of a new system, in particular to a rapid unit selection method of an opportunity array antenna, which is used for the fields of radar and various detection by using antennas.
In particular to a method for quickly selecting an antenna unit by combining the half-power beam width of the antenna and the maximum radiation direction of the unit.
Background
In a conventional phased array antenna, such as a linear array, a planar array, and the like, due to the consistency of the maximum radiation directions of all antenna units, all antenna units are selected during antenna beam scanning, so that the problem of array element selection caused by a scanning angle does not exist. However, the traditional linear array and planar array have the problems that the array is difficult to conform to a carrier platform and provide larger gain, and the problems directly restrict the power of a radar phased array system. The opportunistic array antenna units are usually densely distributed at each position of the carrier platform, the effective caliber of the carrier platform is fully utilized, the gain far higher than that of the traditional phased array antenna is provided, and the opportunistic array antenna unit plays a great role in national defense application.
The opportunistic array antenna system is provided for maximizing the array arrangement aperture, improving the antenna gain and increasing the radar detection distance while keeping the stealth performance of a warship carrier platform. The elements of the opportunistic array antenna are usually located at each position of the carrier platform, but due to the factors of the inconsistency of the maximum radiation directions of the antenna elements, the shielding of the carrier platform and the like, under different scanning angles, appropriate elements in the array need to be selected to complete the group array.
The directional diagram of the opportunistic array antenna is equal to the sum of the directional diagrams of all the antenna units, and when the opportunistic array antenna selects the unit, the antenna units with the scanning angles within the half-power beam width range need to be selected for array formation on the premise of giving the scanning angles. And determining an array directional diagram of the antenna units, and performing full-wave simulation analysis on all the arrays under corresponding carrier platforms to extract the directional diagrams of all the antenna units.
However, due to the limitation of a computer, full-wave simulation analysis on a large-scale opportunistic array antenna is time-consuming, the application of a radar detection system in reality is difficult to meet, especially in modern national defense research, time and accuracy are particularly important, and an efficient and rapid opportunistic array antenna unit selection method is objectively needed to be matched with the opportunistic array antenna unit selection method to complete rapid detection of signals by the radar system.
Disclosure of Invention
The invention aims to provide a more efficient and accurate method for quickly selecting the unit of the opportunistic array antenna, aiming at the problem that the unit of the opportunistic array antenna is difficult to select.
The invention relates to a quick selection method of units of an opportunity array antenna, which is characterized by comprising the following steps:
(1) and setting parameters: the opportunistic array antenna is provided with N antenna units, and the beam pointing direction of the opportunistic array antenna is
Selecting the distance R of the far field region of the antenna, and obtaining an antenna beam pointing vector S according to the beam pointing direction and the distance of the far field region, wherein: the coordinate position of the ith antenna unit is (x)i,yi,zi) And theta is a pitch angle,
in azimuth, R is much greater than 2D2λ and 10D, D is the maximum size of the physical aperture of the opportunistic array antenna;
(2) determining the beam width: in free space, simulating one unit in the opportunistic array antenna, and determining the half-power beam width BW of the unit;
(3) and initial value setting: randomly selecting a unit i from the opportunity array antenna, selecting a unit i +1 and a unit i +2 which are adjacent to the unit i +1, and setting an initial value of the randomly selected unit i to be 1;
(4) solving the normal vector outside the unit: in the opportunity array antenna, a plane formed by the selected ith, the subsequent adjacent (i + 1) th and (i + 2) th antenna units is approximately solved for the external normal vector n of the position of the ith antenna unitiAnd the direction is approximately used as the radiation direction of the ith antenna unit;
(5) calculating an included angle between the maximum radiation direction and the beam pointing direction: calculating the maximum radiation direction n of each antenna unitiAngle psi to beam pointing vector SiWhether the antenna unit is selected or not is judged whether the antenna unit exceeds the selection range;
(6) and whether the unit selects the comparison judgment: angle psi between maximum radiation direction using antenna elements and beam pointing directioniJudging whether the antenna unit is selected or not according to the relation with the half-power beam width BW of the antenna unit, and judging whether the antenna unit exceeds a selection range or not no matter whether the antenna unit is selected or not;
(7) and whether the unit is searched and judged: whether the selected antenna unit i is smaller than the total number N of the antenna units, if i is smaller than N, operating the (i + 1) th antenna unit, repeating the steps (4), (5) and (6), if i is larger than or equal to N, ending the process, and obtaining the selection states of all N antenna units;
(8) and finishing the selection of the antenna unit: and quickly selecting the antenna units meeting the requirements to participate in the quick detection of the signals.
The invention provides a unit quick selection method applied to an opportunistic array antenna by using an included angle between the maximum radiation direction of the free space of an antenna unit and the direction of an array beam.
Compared with the prior art, the invention has the advantages that:
(1) in the array antenna, the maximum radiation directions of all antenna units are inconsistent, and proper units are difficult to accurately select.
(2) According to the invention, only the half-power beam width BW of one unit in the opportunistic array antenna in the free space is used for approximately replacing the half-power beam width of all the antenna units, so that the simulation of a large-scale opportunistic array antenna is avoided, meanwhile, an approximation method is skillfully applied, the outer normal vector of the position of each antenna unit can be calculated, the outer normal vector direction is taken as the antenna radiation direction, the radiation direction of the array antenna is quickly obtained through the superposition of the radiation directions of each antenna unit, the antenna unit can be selected more efficiently, and the practical requirement is met more.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a diagram of an X-band quinacral opportunistic array in an embodiment of the invention;
figure 3 shows that when theta is 0 deg. according to the invention,
selecting antenna units of a five-plane opportunistic array;
figure 4 shows the invention when theta is 30 deg.,
selecting antenna units of a five-plane opportunistic array;
figure 5 shows the invention when theta is 30 deg.,
selecting antenna units of a five-plane opportunistic array;
figure 6 shows the invention when theta is 45 deg.,
then the antenna units of the five-plane opportunistic array are selected.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments,
example 1
With the wide application of the antenna, the traditional phased array antenna is too large in volume and weight, difficult to conform to a carrier, low in gain and difficult to meet practical requirements, on the basis, the opportunistic array antenna is produced, the opportunistic array antenna makes full use of the carrier platform, the antenna gain is improved, however, the conventional opportunistic array antenna is difficult to rapidly select an array antenna unit, the invention develops research on the problem, and provides a rapid unit selection method based on the opportunistic array antenna.
With the rapid development of antenna technology, the use of antennas is no longer limited to a single field, and the antennas are widely applied to the aspects of communication, radar, aerospace and the like, and the invention relates to a unit rapid selection method based on an opportunistic array antenna, which is shown in fig. 1 and comprises the following steps:
(1) and setting parameters: the opportunistic array antenna is provided with N antenna units, and the beam pointing direction of the opportunistic array antenna is
Selecting the distance R of the far field region of the antenna, and obtaining an antenna beam pointing vector S according to the beam pointing direction and the distance of the far field region, wherein: the coordinate position of the ith antenna unit is (x)i,yi,zi) Theta is a pitch angle and has a value range of 0-180 degrees,
is an azimuth angle with the value range of 0-360 degrees, and R is far greater than 2D2And/lambda and 10D, D is the maximum size of the physical aperture of the opportunistic array antenna.
Regardless of the antenna used, certain environmental conditions must be satisfied. The invention also satisfies certain conditions, such as requiring R to be much greater than 2D2And the/lambda and 10D, D are the maximum size of the physical aperture of the opportunistic array antenna, so that the proper distance of a far field region can be selected, meanwhile, the proper scanning angle can be obtained only by setting the antenna beam pointing vector, and the antenna unit meeting the requirement is selected according to the scanning angle.
(2) Determining the beam width: in free space, one element in an opportunistic array antenna is simulated and the half-power beamwidth BW of the element is determined. The beam width is an important index for measuring the performance of the antenna, and in consideration of the complexity of calculation, a computer is adopted to carry out simulation on the antenna unit. If the computer simulates all the antenna units, the computer takes a lot of time, which is contrary to the practical requirement.
(3) And initial value setting: the opportunistic array antenna comprises a computer, an opportunistic array antenna and a computer, wherein the opportunistic array antenna comprises a unit i, a unit i is randomly selected from the opportunistic array antenna, a unit i +1 and a unit i +2 which are adjacent to the unit i +1 and the unit i +2 are selected, initial value setting is carried out on the randomly selected antenna unit i, the initial value of i is set to be 1, the opportunistic array antenna is composed of a plurality of antenna units, each antenna unit is in different positions, therefore, the antenna unit needs to be selected, initial value setting is carried out on the antenna unit, and then the computer starts.
(4) Solving the normal vector outside the unit: in the opportunity array antenna, a plane formed by the selected ith, the subsequent adjacent (i + 1) th and (i + 2) th antenna units is approximately solved for the external normal vector n of the position of the ith antenna unitiAnd the radiation direction of each antenna unit cannot be simply and effectively represented because the radiation directions of the antenna units are different in the opportunistic array antenna, the invention can calculate the external normal vector of each antenna unit one by adopting an approximation method, and the external normal vector represents the radiation direction of each antenna unit.
(5) Calculating an included angle between the maximum radiation direction and the beam pointing direction: calculating the maximum radiation direction n of each antenna unitiAngle psi to beam pointing vector SiThe invention adopts the included angle between the maximum radiation direction and the beam direction as the selection basis, and the included angle psiiThe smaller the antenna directivity, the better the antenna performance, the longer the range. The invention is characterized in that the included angle psiiOnly the maximum radiation direction n of each antenna element is calculatediAngle psi to beam pointing vector SiBased on this, the correct unit can be selected.
(6) And whether the unit selects the comparison judgment: angle psi between maximum radiation direction using antenna elements and beam pointing directioniJudging whether the antenna unit is selected or not according to the relation with the half-power beam width BW of the antenna unit, wherein the radiation direction of the antenna is generally provided with two lobes or a plurality of lobes, the main lobe is called as the main lobe with the maximum radiation intensity, the other lobes are auxiliary lobes, and the main lobe is the largestThe angle between two points of which the radiation intensity is reduced by 3dB on two sides in the large radiation direction is called half-power beam width, half of the half-power beam width is used as a judgment standard of the invention, and the antenna unit meeting the requirement is quickly and accurately selected through comparison and judgment.
Whether the antenna unit is selected or not is judged whether the antenna unit exceeds the selection range or not.
(7) And whether the unit is searched and judged: whether the selected antenna unit i is smaller than the total number N of the antenna units, if i is smaller than N, operating the (i + 1) th antenna unit, giving i +1 to i, referring to the figure 1, and repeating the steps (4), (5) and (6); and if i is larger than or equal to N, ending the process to obtain the selection states of all N antenna units. This is a constraint control on the whole selection process of the antenna units, the selection of the antenna units can only be within this range, and all the antenna units are searched through comparison and judgment.
(8) And finishing selection: and quickly selecting the antenna units meeting the requirements to participate in the quick detection of the signals.
The invention solves the problem that the maximum radiation directions of all antenna units are inconsistent in the array antenna and the proper unit is difficult to accurately select.
Example 2
The method for quickly selecting elements of the opportunistic array antenna is the same as that in embodiment 1, and in the beam width determination described in step (2), only the half-power beam width BW of one element in the opportunistic array antenna in the free space is used to approximately replace the half-power beam widths of all antenna elements.
The method for quickly selecting the opportunistic array antenna unit only adopts the half-power beam width of one antenna unit, does not need to search out the half-power beam widths of all the antenna units one by one, and the time spent on acquiring the half-power beam width of one antenna unit on a computer is less than 0.02 second, so that the searching and selecting process of the antenna unit is effectively accelerated, a large amount of precious time is saved, the defects of insensitive response and slow signal capture of the conventional radar in the working process are overcome, and the radar is in a high-speed and high-efficiency working state on target detection.
Example 3
The method for quickly selecting the elements of the opportunistic array antenna is the same as that in the embodiment 1-2, and the external normal vector n in the step (4) of the inventioniAnd the specific approximation calculation is expressed as follows,
wherein the content of the first and second substances,
are all rectangular coordinate axis unit vectors; i, i +1, i +2 are the ith antenna unit, the (i + 1) th antenna unit, and the (i + 2) th antenna unit, respectively.
The invention not only proposes the utilization of the external normal vector niTo participate in calculating the included angle between the maximum radiation direction and the beam direction and provide an external normal vector niThe invention calculates the external normal vector n of each antenna unit by combining the current optional antenna unit with the subsequent adjacent antenna unit through an approximation methodiAnd taking the external normal vector direction as the radiation direction of the antenna unit.
Example 4
The unit fast selection method of the opportunistic array antenna is the same as the embodiments 1-3, and the maximum radiation direction n of each antenna unit in the step (5) of the inventioniAngle psi to beam pointing vector SiThe calculation formula is as follows,
wherein theta is a pitch angle,
and R is the distance of the far field region of the antenna.
The invention not only provides a calculation method of the beam pointing vector S, but also provides the maximum radiation direction niAngle psi to beam pointing vector SiThe calculated included angle psiiThe included angle psi is used as the basis for selecting whether the antenna unit is suitableiThe smaller the antenna directivity, the better the antenna performance, the longer the range. Through an included angle psiiAnd comparing the half-power beam width with the half-power beam width, and quickly and accurately selecting a proper antenna unit.
Example 5
The cell fast selection method of opportunistic array antenna is the same as that of embodiments 1-4, and the included angle psi is used in step (6) of the inventioniDetermining whether the antenna unit is selected according to the relationship with the half-power beam width BW of the antenna unit, specifically: if the external normal vector is the angle psi between the external normal vector and the beam pointing vectori<BW/2, indicating the selected cell is in the radiation direction
And (4) selecting the ith antenna unit, and then judging whether all the antenna units are searched to finish the judgment. Otherwise, in the direction of radiation
And if the antenna unit is in the closed state, continuously judging whether the antenna unit is completely searched. Whether the antenna unit is selected or not is judged whether the antenna unit exceeds the selection range or not, and the whole selection process is finished.
The invention selects half of half power beam width and BW/2 as the judgment standard of selection, and the maximum radiation direction niAngle psi to beam pointing vector SiComparing and judging, and quickly and accurately selecting by adopting an objective and scientific comparison methodThe antenna units meeting the requirements are taken out, and practice also shows that the method can solve the problem that the proper antenna units are difficult to quickly and accurately select in the conventional opportunistic array, and meets the actual requirements.
The invention will now be further described with reference to the accompanying drawings by way of a comprehensive example,
example 6
The cell fast selection method of the opportunistic array antenna is the same as that of the embodiments 1-5,
referring to fig. 1, a method for quickly selecting a cell applied to an opportunistic array antenna includes the following steps:
step (1): suppose that a five-face opportunistic array antenna operating in an X band is composed of N-320 antenna elements, and the coordinate position of the ith antenna element is (X)i,yi,zi)。
Step (2): determining opportunistic array antenna beam pointing
Wherein theta is a pitch angle ranging from 0 degree to 180 degrees,
the azimuth angle range is 0-360 DEG, and the distance of the far field region is assumed to be R>>max(2D210D), D is the maximum size of the physical aperture of the opportunistic array antenna, and referring to the five-plane opportunistic array structure shown in fig. 2, the maximum size is 303.7mm, the operating wavelength λ is 30mm, and R may be 100000mm, so that the beam pointing vector is defined as
And (3): in free space, simulating one unit in the opportunistic array antenna, and determining the half-power beam width BW of the unit, wherein the half-power beam width BW in the five-surface opportunistic array is 100 degrees;
and (4): using a plane formed by the ith, the (i + 1) th and the (i + 2) th antenna units to approximately solve the external normal vector n of the position of the ith antenna unitiAnd the approximate normal vector direction is used as the ith antenna unitIn the direction of radiation of (a), wherein,
wherein the content of the first and second substances,
are all rectangular coordinate axis unit vectors; i, i +1, i +2 are the ith antenna unit, the (i + 1) th antenna unit, and the (i + 2) th antenna unit, respectively.
And (5): calculating the maximum radiation direction n of each antenna unitiAngle psi to beam pointing vector SiWherein, in the step (A),
and (6): if psii<BW/2, in the direction of radiation
The ith antenna element is selected, otherwise, the antenna element is in the radiation direction
The antenna unit is in a closed state.
And (5) repeating the steps (4), (5) and (6) to obtain the selection state of all the antenna units, wherein the total number N of all the antenna units is 320 antenna units.
Example 7
The cell fast selection method of the opportunistic array antenna is the same as that of the embodiments 1-6,
the advantages of the present invention can be further illustrated by the following examples:
referring to fig. 2, fig. 2 is a diagram of an X-band five-plane opportunistic array in the embodiment of the present invention;
in this example, on the basis of fig. 2, the method is applied to select the elements of the pentagonal frustum opportunistic array for four typical scanning angles, where θ is 0 degrees respectively,
the simulation results are shown in fig. 3, fig. 4, fig. 5, and fig. 6, where fig. 3 shows that when θ is 0 °,
selecting antenna units of a five-plane opportunistic array; figure 4 shows the invention when theta is 30 deg.,
selecting antenna units of a five-plane opportunistic array; figure 5 shows the invention when theta is 30 deg.,
selecting antenna units of a five-plane opportunistic array; figure 6 shows the invention when theta is 45 deg.,
then the antenna units of the five-plane opportunistic array are selected.
In the figure, "●" is a black dot indicating that the cell at this location was selected, "O" is a white dot indicating that the cell at this location was not selected,
fig. 3(a) is a top view of a pentagonal frustum, i.e., xoy plane, in the result of the five-sided opportunistic array simulation, fig. 3(b) is a front view of the pentagonal frustum, i.e., xoz plane, fig. 3(c) is a side view of the pentagonal frustum, i.e., yoz plane, and as can be seen from the figure, when θ is 0 °,
in the process, five surfaces of the five-surface frustum are selected, and all the antenna units are selected.
Fig. 4(a) is a top view of the pentagonal frustum, i.e., xoy plane, in the result of the five-sided opportunistic array simulation, fig. 4(b) is a front view of the pentagonal frustum, i.e., xoz plane, fig. 4(c) is a side view of the pentagonal frustum, i.e., yoz plane, and as can be seen from the figure, when θ is 30 °,
then, the antenna units on the upper surface and the right side surface of the pentahedral frustum are selected, whereinWhen the side view (c) is viewed from left to right, the unselected left side is viewed first, and the right side is the selected antenna element, so that black dots and white dots are mixed in the front view, the white dots represent the unselected left side, and the black dots represent the selected right side of the antenna element.
Fig. 5(a) is a top view of a pentagonal frustum, i.e., xoy plane, in the result of the five-sided opportunistic array simulation, fig. 5(b) is a front view of the pentagonal frustum, i.e., xoz plane, fig. 5(c) is a side view of the pentagonal frustum, i.e., yoz plane, and as can be seen from the figure, when θ is 30 °,
when the front view (b) is viewed from left to right, the unselected front side is seen first, and the selected antenna unit is seen from the back side, so that black dots and white dots are mixed in the front view, the white dots represent the unselected front side, and the black dots represent the selected back side of the antenna unit.
Fig. 6(a) is a top view of the pentagonal frustum, i.e., the xoy plane, in the result of the five-sided opportunistic array simulation, fig. 6(b) is a front view of the pentagonal frustum, i.e., the xoz plane, fig. 6 (c) is a side view of the pentagonal frustum, i.e., the yoz plane, and as can be seen from the figure, when θ is 45 °,
when the antenna unit is seen from left to right, the unselected left side surface is seen first, and the right side surface is the selected antenna unit, so that black points and white points are mixed in the front view, the white points represent the unselected left side surface, the black points represent the selected right side surface of the antenna unit, when the front view (b) is seen from left to right, the unselected front surface is seen first, and the back surface is the selected antenna unit, so that the black points and the white points are mixed in the front view, the white points represent the unselected front surface, and the black points represent the selected back surface of the antenna unit.
From the simulation result chart, the cell selection of the opportunistic array antenna is different under different scanning angles, and the cell selection takes 0.017 seconds on average.
The simulation results prove that the method can quickly, efficiently and accurately select the opportunistic array antenna unit under the given scanning angle.
The above description and examples are only preferred embodiments of the present invention and should not be construed as limiting the present invention, it will be obvious to those skilled in the art that various modifications and changes in form and detail may be made based on the principle and construction of the present invention after understanding the content and design principle of the present invention, but such modifications and changes based on the inventive concept are still within the scope of the appended claims.
In summary, the invention discloses a method for quickly selecting units of an opportunistic array antenna, belongs to the technical field of radar antennas of new systems, and mainly relates to quick extraction of radar antenna units. The invention solves the technical problem that the prior opportunistic array antenna unit is difficult to select. The implementation of the method comprises the setting of all parameters of the opportunistic array antenna, such as the setting of the number of antenna units, the setting of the beam pointing direction, the setting of the distance of a far field region of the antenna and the like; determining the beam width, namely determining the half-power beam width BW of a unit in the opportunistic array antenna by simulating the unit; determining an initial value, and selecting an antenna unit by a computer through setting the initial value; solving the external normal vector of the unit, and taking the solved external normal vector direction of the antenna unit as the radiation direction of the antenna; calculating the included angle between the maximum radiation direction and the beam direction, wherein the size of the included angle determines whether the antenna unit meets the selection requirement; whether the unit is selected or not is judged by comparison, and if the included angle between the maximum radiation direction and the beam direction is within the range of half of the half-power beam width, the unit is the antenna unit meeting the requirement; whether the selection is continued or not is judged, and whether all the antenna units are searched or not is judged; and finally, selecting the antenna unit to quickly obtain the proper antenna unit. The invention combines the radiation pattern of the antenna unit to accurately select the radiation unit under a given scanning angle. Secondly, the half-power beam width BW of one unit in the opportunistic array antenna in the free space is only used for approximately replacing the half-power beam width of all the antenna units, so that the simulation of a large-scale opportunistic array antenna is avoided, and the antenna units are selected more efficiently to meet the actual requirement on quick target search.
Claims (2)
1. A method for quickly selecting units of an opportunistic array antenna is characterized by comprising the following steps:
(1) and setting parameters: the opportunistic array antenna is provided with N antenna units, and the beam pointing direction of the opportunistic array antenna is
Selecting the distance R of the far field region of the antenna, and obtaining an antenna beam pointing vector S according to the beam pointing direction and the distance of the far field region, wherein: the coordinate position of the ith antenna unit is (x)i,yi,zi) And theta is a pitch angle,
in azimuth, R is much greater than 2D2λ and 10D, D is the maximum size of the physical aperture of the opportunistic array antenna;
(2) determining the beam width: in free space, simulating one unit in the opportunistic array antenna, and determining the half-power beam width BW of the unit;
(3) and initial value setting: randomly selecting a unit i from the opportunity array antenna, selecting a unit i +1 and a unit i +2 which are adjacent to the unit i +1, and setting an initial value of the randomly selected unit i to be 1;
(4) solving the normal vector outside the unit: in the opportunity array antenna, a plane formed by the selected ith, the subsequent adjacent (i + 1) th and (i + 2) th antenna units is approximately solved for the external normal vector n of the position of the ith antenna unitiAnd the direction is approximately used as the radiation direction of the ith antenna unit; outer normal vector niAnd the specific approximation calculation is expressed as follows,
wherein the content of the first and second substances,
are all rectangular coordinate axis unit vectors; i, i +1 and i +2 are the ith antenna unit, the (i + 1) th antenna unit and the (i + 2) th antenna unit respectively;
(5) calculating an included angle between the maximum radiation direction and the beam pointing direction: calculating the maximum radiation direction n of each antenna unitiAngle psi to beam pointing vector SiWhether the antenna unit is selected or not is judged whether the antenna unit exceeds the selection range; maximum radiation direction n of each antenna elementiAngle psi to beam pointing vector SiThe calculation formula is as follows,
wherein theta is a pitch angle,
the azimuth angle is R, and the distance of the antenna far field region is R;
(6) and whether the unit selects the comparison judgment: angle psi between maximum radiation direction using antenna elements and beam pointing directioniJudging whether the antenna unit is selected or not according to the relation with the half-power beam width BW of the antenna unit, and judging whether the antenna unit exceeds a selection range or not no matter whether the antenna unit is selected or not; using the angle psiiDetermining whether the antenna unit is selected according to the relationship with the half-power beam width BW of the antenna unit, specifically: if the angle phi between the external normal vector and the beam pointing vector isi<BW/2, indicating the selected cell is in the radiation direction
If the number of the antenna units is greater than the preset value, the ith antenna unit is selected, and then whether all the antenna units are searched is judged; otherwise, in the direction of radiation
When the antenna unit is in a closed state, whether the antenna unit is completely searched or not is continuously judged;
(7) and whether the unit is searched and judged: whether the selected antenna unit i is smaller than the total number N of the antenna units, if i is smaller than N, operating the (i + 1) th antenna unit, repeating the steps (4), (5) and (6), if i is larger than or equal to N, ending the process, and obtaining the selection states of all N antenna units;
(8) and finishing the selection of the antenna unit: and quickly selecting the antenna units meeting the requirements to participate in the quick detection of the signals.
2. The method of claim 1, wherein the beam width determination in step (2) uses only the half-power beam width BW approximation of one element in the opportunistic array antenna in free space instead of the half-power beam widths of all antenna elements.
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| CN108693510B (en) * | 2018-05-18 | 2022-01-07 | 西安电子科技大学 | Knowledge-assisted airborne opportunistic formation clutter rapid simulation method based on GPU |
| KR20200022266A (en) | 2018-08-22 | 2020-03-03 | 삼성전자주식회사 | Method for adjusting a phase of a signal input to a plurality of antennas and an electronic device implementing the same |
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