CN114384332A - Method for testing short wave antenna polarization directional diagram - Google Patents

Method for testing short wave antenna polarization directional diagram Download PDF

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CN114384332A
CN114384332A CN202111605623.8A CN202111605623A CN114384332A CN 114384332 A CN114384332 A CN 114384332A CN 202111605623 A CN202111605623 A CN 202111605623A CN 114384332 A CN114384332 A CN 114384332A
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antenna
polarization
short
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wave
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刘玉龙
方如
李东超
聂贺峰
陈恩平
李瑞龙
冷学健
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China Institute of Radio Wave Propagation CETC 22 Research Institute
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China Institute of Radio Wave Propagation CETC 22 Research Institute
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Abstract

The invention discloses a method for testing a short wave antenna polarization directional diagram, which adopts an unmanned aerial vehicle to carry a calibrated three-coordinate electric small loop antenna, synchronously and independently receives three orthogonal electric field components in a space, and obtains polarization parameters such as total electric field intensity, polarization dip angle, axial ratio and the like according to the received three orthogonal electric field components and a theoretical correction model. The method for testing the polarization directional diagram of the short wave antenna can obtain the polarization characteristic of the whole upper half space of the short wave antenna in the field environment through one-time complete flight test. Compared with the conventional short-wave antenna directional pattern testing method, the method can obtain the polarization characteristic of the short-wave antenna in any direction of the upper half space in the field environment, so that the complete description of the far-field radiation directional pattern of the short-wave antenna can be obtained.

Description

Method for testing short wave antenna polarization directional diagram
Technical Field
The invention belongs to the field of short wave antenna test, and particularly relates to a method for testing a polarization directional diagram of a short wave antenna in the field.
Background
The short wave antenna is generally bulky, complex in structure, not easy to move or rotate, and the radiation performance of the short wave antenna is inseparable from the erection environment. Therefore, the radiation field test of the short wave antenna is usually performed on the erection site by adopting a fixed antenna method.
The fixed antenna method is divided into a ground test and an air test. The ground test is to select a series of azimuth test points in a sector or circular area with the radius of a ground plane r by taking an antenna to be tested as the center, and measure at each point, thereby obtaining the directional diagram characteristic of the ground plane. However, the ground test is limited to the horizontal plane test, and the vertical plane test cannot be performed, and because the main lobe of the short-wave antenna is often not in the horizontal plane and generally has a certain elevation angle, the method is difficult to obtain the real main lobe characteristic.
The air test method is relatively comprehensive and flexible, and is a test method which is generally adopted at home and abroad. In the method, the antenna to be measured is still fixed, and the auxiliary antenna is arranged on an aircraft such as a balloon, an airship, an airplane and the like. The receiving or transmitting equipment is carried on the aircraft and moves circularly around the antenna to be tested in the plane to be tested, so that the directional characteristic of the plane is obtained. Besides the very low elevation angle, the aerial test method can test the far-field characteristics of the whole upper half space of the short-wave antenna. The method is flexible and convenient in the selection of the measuring route, is less influenced by the ground environment and has lower measuring error.
In 1973, the Stanford research institute of America developed a short wave antenna directional pattern measuring system (XELEDOP), which utilizes a helicopter to respectively drag a horizontal polarized antenna and a vertical polarized antenna to fly on a spherical surface at a certain distance from an antenna to be measured and transmit signals, so that directional patterns of different polarizations of the antenna to be measured can be respectively measured. However, the attitude of the towed antenna is easily influenced by flight speed and environmental conditions, and polarization mismatch errors exist; the radiation gain of the vertical polarization antenna relative to the antenna to be measured is different at different elevation angles, and normalization is required according to a theoretical value.
Since 2005, the air test method is adopted domestically, and vertical or horizontal polarized antennas are carried by captive airships, manned airships, fixed wing unmanned aerial vehicles and the like, so that field far field pattern tests are carried out on domestic short wave log periodic antennas, horizontal dipole array antennas and the like, but due to polarization mismatch and many influences of a flight platform, actual test results are not ideal.
The method adopts the auxiliary antenna with single linear polarization for testing, only can measure the field component of corresponding polarization, cannot measure the gain directional diagram of the short-wave antenna, and even cannot measure the polarization directional diagram of the short-wave antenna. This is an incomplete description of the antenna radiation pattern, since a short-wave horizontally polarized antenna erected on the actual ground has cross-polarization components, and the cross-polarization components in different directions are different in magnitude. A complete description of the radiation pattern requires that the polarization characteristics be measured as a function of direction, and in particular in the direction away from the main radiation lobe, the polarization characteristics may differ considerably from the design values. Up to now, no public report on a method for testing a polarization pattern of a short-wave antenna on a real ground has been found.
Disclosure of Invention
The invention aims to provide a method for testing a short wave antenna polarization directional diagram in a field environment.
The invention adopts the following technical scheme:
a method for testing a short wave antenna polarization directional diagram is characterized in that an unmanned aerial vehicle is adopted to carry a calibrated three-coordinate electric small loop antenna, three orthogonal electric field components in a space are synchronously and independently received, and polarization parameters such as total electric field intensity, a polarization inclination angle and an axial ratio are obtained according to the received three orthogonal electric field components and a theoretical correction model. Because the space field intensity of any polarization can be completely expressed by the components of the three orthogonal electric fields, the unmanned aerial vehicle can measure the polarization directional diagram in the solid angle range of the corresponding wave beam and the change condition of the radiation field intensity amplitude and the polarization inclination angle of the upper half space of the short wave antenna along with the azimuth or elevation angle by taking the short wave antenna to be measured as the center in single air flight, and the method comprises the following steps:
step 1, designing a three-coordinate small electric loop antenna as an auxiliary receiving antenna, wherein the three-coordinate small electric loop antenna comprises three small electric loop antennas, the diameters and matching networks of the three small electric loop antennas are completely the same, the three small electric loop antennas are assembled in a three-orthogonal mode according to the common point of circle centers, and the antenna coefficients of each small electric loop antenna are calibrated at 3 MHz-30 MHz respectively to ensure that the antenna coefficients of the three small electric loop antennas are the same, namely:
Kx＝Ky＝Kz＝K (1)
step 2, with the concurrent center of the three-coordinate electrical small-loop antenna of the auxiliary receiving antenna as the origin, establishing a spherical coordinate system as shown in fig. 3, and then expressing the radiation field intensity E of a certain point in the remote area of the short-wave antenna to be measured as:
Figure BDA0003433630010000021
wherein the content of the first and second substances,
Figure BDA0003433630010000022
the amplitude of the radiation field intensity of the antenna to be measured, -kr is the phase of the radiation field intensity changing along with the distance r, and k is a space propagation constant;
during actual test, the short wave antenna to be tested is positioned in the lower half space of the three-coordinate electric small loop antenna, theta is set to be more than or equal to 90 degrees and less than or equal to 180 degrees, and the azimuth angle is set as follows:
Figure BDA0003433630010000023
the polarization dip angle is set as: tau is more than or equal to 0 degree and less than or equal to 180 degrees;
step 3, the radiation field intensity of a certain point of the short wave antenna far zone to be detected can be horizontally polarized in the wave front plane to form a field intensity EHAnd the vertical polarization field strength EVDecomposing the short wave antenna to be detected in a coordinate base, wherein the radiation field of the short wave antenna to be detected in a far area is an elliptical polarized wave, and the major axis of the elliptical polarized wave is E as shown in FIG. 4mMinor axis EnMajor axis EmAnd the intensity E of the horizontal polarization fieldHIs the polarization dip τ, then:
Em＝EHcos τ+EV sinτ (3)
En＝EHsinτ+EVcosτ (4)
order to
Figure BDA0003433630010000031
Is a three orthogonal coordinate basis, phi, in the rectangular coordinate system shown in FIG. 3H、φVFor horizontally polarizing field strength EHAnd the vertical polarization field strength EVPhase of (E) thenHAnd EVExpressed in a rectangular coordinate system as:
Figure BDA0003433630010000032
Figure BDA0003433630010000033
the formula (5) and the formula (6) are taken into the formula (3) and the formula (4) to obtain the finishing agent:
Figure BDA0003433630010000034
Figure BDA0003433630010000035
Figure BDA0003433630010000036
three-coordinate electric small loop antenna respectively corresponding to receive Ex，Ey，EzAnd, due to the conservation of power of the electric wave, there are:
|E|2＝|Ex|2+|Ey|2+|Ez|2＝|EH|2+|EV|2 (10)
step 4, selecting an unmanned aerial vehicle with a holder, fixing the three-coordinate electric small loop antenna in the holder of the unmanned aerial vehicle, and ensuring that the relative posture of the three-coordinate electric small loop antenna and the short wave antenna to be detected is kept stable by the automatic tracking function of the holder;
step 5, theoretically simulating the three-coordinate electric small loop antenna, such as the unmanned aerial vehicle, wireless data transmission equipment, global positioning equipment and the like at will according to the relative position of the three-coordinate electric small loop antenna and the unmanned aerial vehicle in the step 4
Figure BDA0003433630010000037
The influence of the intensity of the directionally radiated field, denoted Δ Ex，ΔEy，ΔEz；
And 6, according to the formula (1) and the step 5, the voltages of the three-coordinate small loop antenna and the three-channel receiver for independently receiving the electric field components are respectively expressed as:
Ux＝(Ex+ΔEx)/K (11)
Uy＝(Ey+ΔEy)/K (12)
Uz＝(Ez+ΔEz)/K (13)
step 7, the short wave antenna to be tested emits interesting testing frequency point signals, the unmanned aerial vehicle takes the short wave antenna to be tested as a sphere center, circular flight is carried out on a spherical surface with the remote field radius of the short wave antenna to be tested being R, R is not less than 10 times of wavelength, and the angle of any point of the unmanned aerial vehicle relative to the short wave antenna to be tested on a flight track is recorded
Figure BDA0003433630010000038
And corresponding Ux，Uy，Uz；
During testing, only the space relative position of the three-coordinate electric small-ring antenna and the short-wave antenna to be tested changes, when the initial condition is that the X-axis directions of the two coordinate systems are opposite and the Z-axis directions are the same, and if the anticlockwise rotation azimuth angle of the unmanned aerial vehicle is delta, the unmanned aerial vehicle rotates anticlockwise, and then the three-coordinate electric small-ring antenna and the short-wave antenna to be tested rotate only have the same space relative position
Figure BDA0003433630010000039
And
Figure BDA00034336300100000310
the following relationships exist:
θ＝180°-θ′ (14)
Figure BDA0003433630010000041
step 8, comparing the U recorded in the step 7x，Uy，UzSelecting the maximum field intensity component max { | KU according to the magnitude of the three received voltage componentsx-ΔEx|、|KUy-ΔEy|、|KUz-ΔEzAnd | obtaining any angle of the upper half space of the short-wave antenna to be tested by using the corresponding formulas (7), (8), (9) and (10) of the field intensity component
Figure BDA0003433630010000042
Of the radiation field strength polarization tilt τ, and | EH|、|EV|、φH、φVThe maximum voltage component is selected, so that the test error caused by the possible minimum value can be effectively avoided; let Δ φ become φV-φH，
Figure BDA0003433630010000043
Figure BDA0003433630010000044
Step 9, repeat step 8, according to the record
Figure BDA0003433630010000045
And calculating to obtain the radiation intensity of the far field of the short wave antenna to be measured
Figure BDA0003433630010000046
The polarization tilt τ of the elliptically polarized wave,
Figure BDA0003433630010000047
an angle of ellipticity of
Figure BDA0003433630010000048
When delta phi is larger than 0, the polarization ellipse is right-handed polarization, when epsilon is a minus sign, when delta phi is smaller than 0, the polarization ellipse is left-handed polarization, and when epsilon is a plus sign;
when the delta phi is equal to +/-n pi, and n is equal to 0, 1, 2 and …, the elliptical polarization wave is degenerated into a linear polarization wave, and the polarization dip angle is tau; when | EH|＝|EV|，
Figure BDA0003433630010000049
When the elliptically polarized wave is degraded to a circularly polarized wave, wherein,
Figure BDA00034336300100000410
Figure BDA00034336300100000411
when the wave is a right-handed circularly polarized wave,
Figure BDA00034336300100000412
the time is left-handed circularly polarized wave;
therefore, the polarization mode of the short wave antenna far-field radiation field to be tested is judged according to the test result, and antenna polarization directional diagrams with different frequencies are drawn.
And step 10, ending.
The invention has the beneficial effects that:
the method for testing the polarization directional diagram of the short wave antenna can obtain the polarization characteristic of the whole upper half space of the short wave antenna in the field environment through one-time complete flight test. Compared with the conventional short-wave antenna directional pattern testing method, the method can obtain the polarization characteristic of the short-wave antenna in any direction of the upper half space in the field environment, so that the complete description of the far-field radiation directional pattern of the short-wave antenna can be obtained.
Drawings
FIG. 1 is a schematic diagram of a test procedure of the method of the present invention;
FIG. 2 is a schematic diagram of a three-dimensional electrical ringlet antenna according to the method of the present invention;
FIG. 3 is a schematic diagram of a spherical coordinate system established with a concurrent center of a three-coordinate electrical ringlet antenna as an origin; (ii) a
FIG. 4 is a polarization ellipse of a radiation field of a far region of a short wave antenna to be tested;
FIG. 5 is a schematic view of the flight trajectory of the drone in the method of the present invention;
FIG. 6(a) is a theoretical simulation model of the effect of the distance change between the unmanned aerial vehicle and the three-coordinate electrical small loop antenna on the radiation field intensity;
fig. 6(b) is a simulation of the effect of the central distance between the drone and the three-coordinate electrical ringlet antenna of 0.8 meter (3.2dB) on the radiation field intensity;
fig. 6(c) is a simulation of the effect of 2.5 meters (0.5dB) of center-to-center spacing between the drone and the three-coordinate electrical ringlet antenna on the radiation field intensity;
fig. 7 is a schematic diagram of an antenna element;
FIG. 8 is a plot of ellipticity angle versus azimuth angle for a vertical log-periodic antenna tested using the method of the present invention at a frequency of 14.87 MHz;
FIG. 9 is a graph of ellipticity angle of a far field polarized wave of a vertical log periodic antenna as a function of azimuth angle at 10MHz according to theoretical simulation of the present invention;
FIG. 10 shows the phase difference between the vertical polarization field strength and the horizontal polarization field strength of the far field polarized wave of the vertical log periodic antenna in the case of 10MHz simulation by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a schematic diagram of the whole process of testing a polarization directional diagram of a short wave antenna to be tested, in a short wave antenna polarization directional diagram test experiment, in order to obtain a three-dimensional directional diagram of the whole space of the short wave antenna to be tested, an airborne receiving antenna is always expected to make circular motion in the whole spherical surface, but due to the existence of the ground, only the directional diagram of the upper half space of the short wave antenna is usually concerned, and for an aircraft, the ideal spherical flight path is difficult to realize. During actual measurement, the spherical helix shown in fig. 5 is used as a test track, and when the unmanned aerial vehicle flies along the spherical helix, the flight track of each point is on a spherical surface with a certain radius of R, so that the distance between the receiving antenna and the short wave antenna to be tested is always kept unchanged.
Three-coordinate small loop antennas with the diameter of 25cm are designed and manufactured, a radiating body of each loop antenna is a copper wire with the diameter of phi 3, a supporting structure is made of a non-conductive glass fiber rod, as shown in figure 2, the three small loop antennas are assembled in a three-orthogonal mode according to the common point of centers of circles, antenna coefficient calibration is carried out on each small loop antenna at the frequency of 3 MHz-30 MHz after matching is carried out on each small loop antenna according to GJB/J5410-2005, and the consistency error of the antenna coefficients K of the three small loop antennas is smaller than 0.5 dB.
The spherical coordinate system shown in fig. 3 is established with the concurrent center of the three-coordinate electrical small-loop antenna as the origin. According to the established spherical coordinate system, the radiation field intensity vector E of a certain point in the remote area of the short wave antenna to be detected is subjected to three-dimensional orthogonal decomposition, and then the three-dimensional electric small-ring antenna respectively and correspondingly receives Ex，Ey，Ez. As shown in fig. 4, the elliptically polarized radiation field of the short-wave antenna to be measured in the far zone is polarized horizontally in the wave front plane with the field intensity EHAnd the vertical polarization field strength EVDecomposition is performed for the coordinate basis.
The small unmanned aerial vehicle is selected as an aerial mobile test platform, the three-coordinate small electric loop antenna and the three-channel receiving module are installed in a tripod head of the unmanned aerial vehicle, and the automatic tracking function of the tripod head can ensure that the relative posture of the three-coordinate small electric loop antenna and the short wave antenna to be tested is kept stable. According to the relative position of the three-coordinate electric small-ring antenna and the unmanned aerial vehicle, the theory simulation unmanned aerial vehicle system comprises the unmanned aerial vehicle, a holder, wireless data transmission, global positioning equipment and the like
Figure BDA0003433630010000061
The influence of the intensity of the directionally radiated field, denoted by (Δ E)x，ΔEy，ΔEz) The simulation model and the results are shown in FIGS. 6(a), 6(b) and 6 (c).
Test frequency point information of interest for emission of short wave antenna to be testedThe unmanned aerial vehicle test platform takes the short wave antenna to be tested as the spherical center, performs circumferential flight on the spherical surface with the far field radius of the short wave antenna to be tested as R, and sets the angle of any point on the flight track relative to the short wave antenna to be tested as
Figure BDA0003433630010000062
According to
Figure BDA0003433630010000063
And
Figure BDA0003433630010000064
the angle relation of the short wave antenna to be tested and the angle of the unmanned plane is recorded
Figure BDA0003433630010000065
And corresponding (U)x，Uy，Uz). Thereby obtaining the arbitrary angle of the upper half space of the short wave antenna to be measured
Figure BDA0003433630010000066
The intensity of the electric field radiation.
Comparison (U)x，Uy，Uz) The magnitude of the three received voltage components,
selecting the maximum field intensity component max { | KUx-ΔEx|、|KUy-ΔEy|、|KUz-ΔEzAnd utilizing expressions (7), (8), (9) and (10) corresponding to the component to test to obtain any angle of the upper half space of the short wave antenna to be tested
Figure BDA0003433630010000067
Of the radiation field strength polarization tilt τ, and | EH|、|EV|、φH、φV. According to the expressions (16) and (17) and the step (9), the polarization mode of the radiation field of the short wave antenna far zone to be detected can be judged, and antenna polarization directional diagrams with different frequencies can be drawn.
Embodiment 1, a polarization pattern of a vertical log periodic antenna is experimentally tested by using the testing method of the present invention, fig. 7 is a schematic diagram of an antenna unit, and a receiving field intensity value of a coordinate on a three-coordinate electrical ringlet antenna measured by an experiment is recorded at a frequency of 14.87MHz, as shown in fig. 8, a change curve of an ellipticity angle of the vertical log periodic antenna with an azimuth angle at the frequency can be measured by using a theoretical formula through data processing.
Embodiment 2, the polarization pattern of the vertical log periodic antenna is theoretically simulated by using the testing method of the present invention, fig. 9 is a variation curve of an ellipticity angle of a far-field polarized wave of the vertical log periodic antenna with an azimuth angle at 10MHz, and fig. 10 is a phase difference between a vertical polarization field intensity and a horizontal polarization field intensity of the far-field polarized wave of the vertical log periodic antenna at 10 MHz.

Claims (1)

1. A method for testing a short wave antenna polarization directional diagram is characterized by comprising the following steps:
step 1, designing a three-coordinate small electric loop antenna as an auxiliary receiving antenna, wherein the three-coordinate small electric loop antenna comprises three small electric loop antennas, the diameters and matching networks of the three small electric loop antennas are completely the same, the three small electric loop antennas are assembled in a three-orthogonal mode according to the common point of circle centers, and the antenna coefficients of each small electric loop antenna are calibrated at 3 MHz-30 MHz respectively to ensure that the antenna coefficients of the three small electric loop antennas are the same, namely:
Kx＝Ky＝Kz＝K (1)
step 2, establishing a spherical coordinate system by taking the concurrent center of the three-coordinate electrical small-loop antenna of the auxiliary receiving antenna as the origin, and expressing the radiation field intensity E of a certain point of the remote area of the short-wave antenna to be detected as follows:
Figure FDA0003433630000000011
wherein the content of the first and second substances,
Figure FDA0003433630000000012
the amplitude of the radiation field intensity of the antenna to be measured, -kr is the phase of the radiation field intensity changing along with the distance r, and k is a space propagation constant;
short test time in actual testThe wave antenna is positioned in the lower half space of the three-coordinate electric small-loop antenna, theta is more than or equal to 90 degrees and less than or equal to 180 degrees, and the azimuth angle is set as follows:
Figure FDA0003433630000000013
the polarization dip angle is set as: tau is more than or equal to 0 degree and less than or equal to 180 degrees;
step 3, the radiation field intensity of a certain point of the short wave antenna far zone to be detected can be horizontally polarized in the wave front plane to form a field intensity EHAnd the vertical polarization field strength EVDecomposing the short wave antenna as a coordinate base, wherein the radiation field of the short wave antenna to be detected in a far area is an elliptical polarized wave, and the major axis of the elliptical polarized wave is EmMinor axis EnMajor axis EmAnd the intensity E of the horizontal polarization fieldHIs the polarization dip τ, then:
Em＝EHcosτ+EVsinτ (3)
En＝EHsinτ+EVcosτ (4)
order to
Figure FDA0003433630000000014
Is a three-orthogonal coordinate base phi in a rectangular coordinate systemH、φVFor horizontally polarizing field strength EHAnd the vertical polarization field strength EVPhase of (E) thenHAnd EVExpressed in a rectangular coordinate system as:
Figure FDA0003433630000000015
Figure FDA0003433630000000016
the formula (5) and the formula (6) are taken into the formula (3) and the formula (4) to obtain the finishing agent:
Figure FDA0003433630000000017
Figure FDA0003433630000000021
Figure FDA0003433630000000022
three-coordinate electric small loop antenna respectively corresponding to receive Ex，Ey，EzAnd, due to the conservation of power of the electric wave, there are:
|E|2＝|Ex|2+|Ey|2+|Ez|2＝|EH|2+|EV|2 (10)
step 4, selecting an unmanned aerial vehicle with a holder, fixing the three-coordinate electric small loop antenna in the holder of the unmanned aerial vehicle, and ensuring that the relative posture of the three-coordinate electric small loop antenna and the short wave antenna to be detected is kept stable by the automatic tracking function of the holder;
step 5, theoretically simulating the unmanned aerial vehicle, the wireless data transmission and the global positioning equipment to randomly simulate the three-coordinate electric small loop antenna according to the relative position of the three-coordinate electric small loop antenna and the unmanned aerial vehicle in the step 4
Figure FDA0003433630000000023
The influence of the intensity of the directionally radiated field, denoted Δ Ex，ΔEy，ΔEz；
And 6, according to the formula (1) and the step 5, the voltages of the three-coordinate small loop antenna and the three-channel receiver for independently receiving the electric field components are respectively expressed as:
Ux＝(Ex+ΔEx)/K (11)
Uy＝(Ey+ΔEy)/K (12)
Uz＝(Ez+ΔEz)/K (13)
step 7, the short wave antenna to be tested emits interesting testing frequency point signals, and the unmanned aerial vehicle takes the short wave antenna to be tested as the sphere centerAnd carrying out circumferential flight on the spherical surface of the short wave antenna to be detected with the far field radius of R, wherein R is not less than 10 times of wavelength, and recording the angle of any point of the unmanned aerial vehicle relative to the short wave antenna to be detected on the flight track
Figure FDA0003433630000000024
And corresponding Ux，Uy，Uz；
During testing, only the space relative position of the three-coordinate electric small-ring antenna and the short-wave antenna to be tested changes, when the initial condition is that the X-axis directions of the two coordinate systems are opposite and the Z-axis directions are the same, and if the anticlockwise rotation azimuth angle of the unmanned aerial vehicle is delta, the unmanned aerial vehicle rotates anticlockwise, and then the three-coordinate electric small-ring antenna and the short-wave antenna to be tested rotate only have the same space relative position
Figure FDA0003433630000000025
And
Figure FDA0003433630000000026
the following relationships exist:
θ＝180°-θ′ (14)
Figure FDA0003433630000000027
step 8, comparing the U recorded in the step 7x，Uy，UzSelecting the maximum field intensity component max { | KU according to the magnitude of the three received voltage componentsx-ΔEx|、|KUy-ΔEy|、|KUz-ΔEzAnd | obtaining any angle of the upper half space of the short-wave antenna to be tested by using the corresponding formulas (7), (8), (9) and (10) of the field intensity component
Figure FDA0003433630000000028
Of the radiation field strength polarization tilt τ, and | EH|、|EV|、φH、φVLet Δ φ become φV-φH，
Figure FDA0003433630000000031
Figure FDA0003433630000000032
Step 9, repeat step 8, according to the record
Figure FDA00034336300000000310
And calculating to obtain the radiation intensity of the far field of the short wave antenna to be measured
Figure FDA0003433630000000033
The polarization tilt τ of the elliptically polarized wave,
Figure FDA0003433630000000034
an angle of ellipticity of
Figure FDA0003433630000000035
When delta phi is larger than 0, the polarization ellipse is right-handed polarization, when epsilon is a minus sign, when delta phi is smaller than 0, the polarization ellipse is left-handed polarization, and when epsilon is a plus sign;
when the delta phi is equal to +/-n pi, and n is equal to 0, 1, 2 and …, the elliptical polarization wave is degenerated into a linear polarization wave, and the polarization dip angle is tau; when | EH|＝|EV|，
Figure FDA0003433630000000036
When the elliptically polarized wave is degraded to a circularly polarized wave, wherein,
Figure FDA0003433630000000037
Figure FDA0003433630000000038
when the wave is a right-handed circularly polarized wave,
Figure FDA0003433630000000039
the time is left-handed circularly polarized wave;
therefore, the polarization mode of the short wave antenna far-field radiation field to be tested is judged according to the test result, and antenna polarization directional diagrams with different frequencies are drawn.
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CN115079113A (en) * 2022-08-22 2022-09-20 国家海洋技术中心 Ground wave radar directional diagram measuring method and system based on unmanned ship
CN117169609A (en) * 2023-11-03 2023-12-05 荣耀终端有限公司 Antenna polarization characteristic measurement system and measurement method
CN117969976A (en) * 2024-04-01 2024-05-03 西安星网天线技术有限公司 Unmanned aerial vehicle-based short wave antenna gain measurement method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115079113A (en) * 2022-08-22 2022-09-20 国家海洋技术中心 Ground wave radar directional diagram measuring method and system based on unmanned ship
CN117169609A (en) * 2023-11-03 2023-12-05 荣耀终端有限公司 Antenna polarization characteristic measurement system and measurement method
CN117169609B (en) * 2023-11-03 2024-03-08 荣耀终端有限公司 Antenna polarization characteristic measurement system and measurement method
CN117969976A (en) * 2024-04-01 2024-05-03 西安星网天线技术有限公司 Unmanned aerial vehicle-based short wave antenna gain measurement method

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