CN113111526A - Antenna isolation degree prediction method based on near-field test data of receiving and transmitting antenna, storage medium and device - Google Patents

Antenna isolation degree prediction method based on near-field test data of receiving and transmitting antenna, storage medium and device Download PDF

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CN113111526A
CN113111526A CN202110432497.4A CN202110432497A CN113111526A CN 113111526 A CN113111526 A CN 113111526A CN 202110432497 A CN202110432497 A CN 202110432497A CN 113111526 A CN113111526 A CN 113111526A
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antenna
gain
transmitting
test data
receiving
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CN113111526B (en
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李尧尧
蔡少雄
胡蓉
曹成
苏东林
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Beihang University
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    • G06—COMPUTING; CALCULATING OR COUNTING
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    • G06F30/20—Design optimisation, verification or simulation

Abstract

The invention discloses an antenna isolation degree prediction method, a storage medium and a device based on transmitting and receiving antenna near-field test data, wherein the method comprises the following steps: calculating the shortest path, namely the short-range line, from the position point Tx of the transmitting antenna on the platform to the position point Rx of the receiving antenna on the platform around the geometric surface, and extracting the ray incidence direction at the Tx according to the shortest path line
Figure DDA0003031920770000011
Extracting discrete grid files wrapping the transmitting antenna aperture box from the near field test data, and extracting an electric field and a magnetic field on each grid node; converting near field test data to Tx at
Figure DDA0003031920770000012
Gain of vertical polarization in direction
Figure DDA0003031920770000013
And horizontal polarization increaseBenefit to
Figure DDA0003031920770000014
Calculating transmit-receive polarization mismatch xpol and spatial path loss L; and obtaining the antenna isolation C. The antenna isolation of the near-field test data of the receiving and transmitting antenna is calculated based on the UTD, and the influence of the ray direction on the antenna gain and polarization isolation at the receiving and transmitting positions is considered by utilizing the characteristics of the field of electromagnetic compatibility, so that the isolation prediction is more accurate.

Description

Antenna isolation degree prediction method based on near-field test data of receiving and transmitting antenna, storage medium and device
Technical Field
The invention relates to computational electromagnetism, in particular to an antenna isolation prediction method, a storage medium and a device based on transmitting and receiving antenna near-field test data.
Background
The consistent geometric diffraction theory (UTD) is widely applied to electromagnetic calculation of large-size targets, because the method depends on the analytic expression of the targets and the targets are difficult to be analyzed and expressed in actual engineering, the application of the UTD method is greatly limited, and the UTD method is based on various types of rays, so that the research of the ray tracing method on any curved surface has important significance.
The UTD of the prior art using near field test data to compute isolation between electrically large platform antennas has the following problems: (1) the traditional UTD method does not consider the gains of receiving and transmitting antennas; (2) the traditional UTD method does not consider the polarization isolation effect of the receiving and transmitting antennas in the space; (3) the traditional UTD method does not consider the influence of the ray directions on the receiving and transmitting positions on the antenna gain and polarization isolation; (4) the conventional UTD method cannot calculate the antenna gain using near-field test data.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an antenna isolation degree prediction method, a storage medium and a device based on transmitting and receiving antenna near-field test data, which are suitable for the electromagnetic compatibility field.
The purpose of the invention is realized by the following technical scheme:
in a first aspect of the present invention, an antenna isolation prediction method based on near-field test data of a transmitting and receiving antenna is provided, which includes:
loading a platform model;
calculating the shortest path, namely the short-range line, from the position point Tx of the transmitting antenna on the platform to the position point Rx of the receiving antenna on the platform around the geometric surface, and extracting the ray incidence direction at the Tx according to the shortest path line
Figure BDA0003031920750000011
And the ray exit direction at Rx
Figure BDA0003031920750000012
And extracting the length trip of the geodesic;
extracting discrete grid files wrapping a transmitting antenna aperture box and discrete grid files wrapping a receiving antenna aperture box from near-field test data, and extracting an electric field and a magnetic field on each grid node;
converting near field test data to Tx at
Figure BDA0003031920750000013
Gain of vertical polarization in direction
Figure BDA00030319207500000112
And horizontally polarized gain
Figure BDA0003031920750000014
And Rx is at
Figure BDA0003031920750000015
Gain of vertical polarization in direction
Figure BDA0003031920750000016
And horizontally polarized gain
Figure BDA0003031920750000017
Using vertical polarisation gain
Figure BDA0003031920750000018
Gain of horizontal polarization
Figure BDA0003031920750000019
Vertical polarization gain
Figure BDA00030319207500000110
And horizontally polarized gain
Figure BDA00030319207500000111
Calculating the receiving and transmitting polarization mismatch xpol of Tx and Rx and the spatial path loss L caused by the Tx and Rx passing through a short-range line;
and obtaining the antenna isolation C by utilizing the transmitting-receiving polarization mismatch xpol and the spatial path loss L.
Further, the loading platform model comprises:
and extracting a point list and a point connection list of the CAD grid model from the platform surface element file in the nastran format.
Further, the converting the near field test data to Tx is performed
Figure BDA0003031920750000021
Gain of vertical polarization in direction
Figure BDA0003031920750000022
And horizontally polarized gain
Figure BDA0003031920750000023
The method for extrapolating by adopting the near-far field specifically comprises the following steps:
by
Figure BDA0003031920750000024
And
Figure BDA0003031920750000025
to obtain
Figure BDA0003031920750000026
By
Figure BDA0003031920750000027
Obtaining the coordinate value of the spherical coordinate system by coordinate transformation
Figure BDA0003031920750000028
Figure BDA0003031920750000029
In order to be the azimuth angle,
Figure BDA00030319207500000210
is an inclination angle; will be provided with
Figure BDA00030319207500000211
Substituting into a calculation formula to obtain an edge
Figure BDA00030319207500000212
Directional horizontally polarized electromagnetic wave far field
Figure BDA00030319207500000213
And edge
Figure BDA00030319207500000214
Far field of vertically polarized electromagnetic wave in direction
Figure BDA00030319207500000215
The calculation formula is as follows:
Figure BDA00030319207500000216
Figure BDA00030319207500000217
where R represents the far field observation radius, k represents the free space wave velocity, n represents the near field grid bin normal vector, E represents the electric field over the S' bin,
Figure BDA00030319207500000218
representing the horizontally polarized far field, H represents the magnetic field on the S' bin,
Figure BDA00030319207500000219
is the unit directional vector of the transmit antenna vertical polarization,
Figure BDA00030319207500000220
is the unit directional vector of the transmit antenna horizontal polarization,
Figure BDA00030319207500000221
the unit vector in the radial direction of the transmitting antenna,
Figure BDA00030319207500000222
Figure BDA00030319207500000223
s ' is the surface of an area wrapped by the antenna aperture box, and r ' is a vector of any point on S ';
to obtain
Figure BDA00030319207500000224
And
Figure BDA00030319207500000225
the far field data result at any angle after the extrapolation of the near field and the far field is obtained;
integrating the power of the electric field on the surface of the wrapped Tx to obtain the radiation power P, and converting the radiation power P into a gain coefficient GnormAnd normalizing the electric field to obtain
Figure BDA00030319207500000226
And
Figure BDA00030319207500000227
Figure BDA00030319207500000228
Figure BDA00030319207500000229
Figure BDA00030319207500000230
Figure BDA00030319207500000231
said Rx is at
Figure BDA00030319207500000232
Gain of vertical polarization in direction
Figure BDA00030319207500000233
And horizontally polarized gain
Figure BDA00030319207500000234
The same way of calculation.
Further, the calculation formula for calculating Tx and Rx transmit-receive polarization mismatch xpol is:
Figure BDA00030319207500000235
Figure BDA00030319207500000236
Figure BDA00030319207500000237
wherein G isTFor transmitting antenna gain, GRIn order to receive the gain of the antenna,
Figure BDA00030319207500000238
being the unit directional vector of the vertical polarization of the receiving antenna,
Figure BDA00030319207500000239
is the unit directional vector of the horizontal polarization of the receiving antenna.
Further, the calculation formula of the spatial path loss L caused by the Tx and Rx passing through the short-range line is:
Figure BDA00030319207500000240
wherein G isTFor transmitting antenna gain, GRIn order to gain the receiving antenna, lambda is the wavelength, and trip is the length of the short-range line of the transmitting and receiving antenna around the surface of the platform.
Further, the calculation formula for obtaining the antenna isolation C by using the transmit-receive polarization mismatch xpol and the spatial path loss L is as follows:
C＝xpol+L。
further, the unit of the transmit-receive polarization mismatch xpol, the spatial path loss L and the antenna isolation C is dB.
Further, the platform is a flying platform.
In a second aspect of the present invention, a storage medium is provided, on which computer instructions are stored, and when the computer instructions are executed, the steps of the antenna isolation prediction method based on near-field test data of a transmitting and receiving antenna are executed.
In a third aspect of the present invention, an apparatus is provided, which includes a memory and a processor, the memory stores computer instructions executable on the processor, and the processor executes the computer instructions to perform the steps of the antenna isolation prediction method based on near-field test data of a transmitting and receiving antenna.
The invention has the beneficial effects that:
in an exemplary embodiment of the invention, the antenna isolation of the near-field test data of the transmitting and receiving antenna is calculated based on the UTD in the prior art, and the influence of the ray direction on the antenna gain and polarization isolation at the transmitting and receiving positions is considered by utilizing the characteristics of the electromagnetic compatibility field, so that the isolation prediction is more accurate.
Drawings
FIG. 1 is a flowchart of a method disclosed in an exemplary embodiment of the invention;
FIG. 2 is a schematic view of a model of a flight platform as disclosed in an exemplary embodiment of the present invention;
FIG. 3 is a schematic diagram of a ray path visualization with polylines showing geolines, as disclosed in an exemplary embodiment of the present invention;
fig. 4 is a schematic structural diagram of a horn antenna disclosed in an exemplary embodiment of the present invention;
FIG. 5 is a schematic diagram of a transmitting antenna aperture box disclosed in an exemplary embodiment of the present invention;
fig. 6 is a vector direction diagram of gain disclosed in an exemplary embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, fig. 1 shows an antenna isolation prediction method based on near-field test data of a transmitting-receiving antenna according to an exemplary embodiment of the present invention, a model of the following exemplary embodiment is mainly described as a flight platform in a preferred exemplary embodiment, and other platforms that may use the method are not described herein again.
The method comprises the following steps:
s01: and loading the platform model.
Specifically, in an exemplary embodiment, a list of points and a list of point connections for a CAD mesh model are extracted from a platform bin file in the nanostran format, with the model displayed as shown in FIG. 2.
S02: calculating the shortest path, namely the short-range line, from the position point Tx of the transmitting antenna on the platform to the position point Rx of the receiving antenna on the platform around the geometric surface, and extracting the ray incidence direction at the Tx according to the shortest path line
Figure BDA0003031920750000041
And the ray exit direction at Rx
Figure BDA0003031920750000042
And the length trip of the geodesic is extracted.
Wherein the ray path may display the geodesic with a polyline, as shown in fig. 3.
S03: and extracting discrete grid files wrapping the transmitting antenna aperture box and discrete grid files wrapping the receiving antenna aperture box from the near field test data, and extracting an electric field and a magnetic field (Ex, Ey, Ez, Hx, Hy and Hz in complex form) on each grid node.
In one exemplary embodiment, the transmitting antenna and the receiving antenna are both horn antennas as shown in fig. 4, and the transmitting antenna aperture box pattern is shown in fig. 5, for example.
S04: converting near field test data to Tx at
Figure BDA0003031920750000043
Gain of vertical polarization in direction
Figure BDA0003031920750000044
And horizontally polarized gain
Figure BDA0003031920750000045
And Rx is at
Figure BDA0003031920750000046
Gain of vertical polarization in direction
Figure BDA0003031920750000047
And horizontally polarized gain
Figure BDA0003031920750000048
Source of near field test data: 1) adopting an antenna near field test system in the anechoic chamber to test the antenna near field; 2) and (5) simulation analysis results of commercial simulation software for the antenna model.
Preferably, in an exemplary embodiment, the converting the near field test data to Tx is performed at
Figure BDA0003031920750000049
Gain of vertical polarization in direction
Figure BDA00030319207500000410
And horizontally polarized gain
Figure BDA00030319207500000411
The method for extrapolating by adopting the near-far field specifically comprises the following steps:
s041: by
Figure BDA00030319207500000412
And
Figure BDA00030319207500000413
to obtain
Figure BDA00030319207500000414
By
Figure BDA00030319207500000415
Obtaining the coordinate value of the spherical coordinate system by coordinate transformation
Figure BDA00030319207500000416
Figure BDA00030319207500000417
In order to be the azimuth angle,
Figure BDA00030319207500000418
is an inclination angle; will be provided with
Figure BDA00030319207500000419
Substituting into a calculation formula to obtain an edge
Figure BDA00030319207500000420
Directional horizontally polarized electromagnetic wave far field
Figure BDA00030319207500000421
And edge
Figure BDA0003031920750000051
Far field of vertically polarized electromagnetic wave in direction
Figure BDA0003031920750000052
The calculation formula is as follows:
Figure BDA0003031920750000053
Figure BDA0003031920750000054
where R represents the far field observation radius, k represents the free space wave velocity, n represents the near field grid bin normal vector, E represents the electric field over the S' bin,
Figure BDA0003031920750000055
indicating horizontal polarizationFar field, H denotes the magnetic field over the S' bin,
Figure BDA0003031920750000056
is the unit directional vector of the transmit antenna vertical polarization,
Figure BDA0003031920750000057
is the unit directional vector of the transmit antenna horizontal polarization,
Figure BDA0003031920750000058
the unit vector in the radial direction of the transmitting antenna,
Figure BDA0003031920750000059
Figure BDA00030319207500000510
s ' is the surface of an area wrapped by the antenna aperture box, and r ' is a vector of any point on S ';
to obtain
Figure BDA00030319207500000511
And
Figure BDA00030319207500000512
the far field data result at any angle after the extrapolation of the near field and the far field is obtained;
s042: integrating the power of the electric field on the surface of the wrapped Tx to obtain the radiation power P, and converting the radiation power P into a gain coefficient GnormAnd normalizing the electric field to obtain
Figure BDA00030319207500000513
And
Figure BDA00030319207500000514
Figure BDA00030319207500000515
Figure BDA00030319207500000516
Figure BDA00030319207500000517
Figure BDA00030319207500000518
and said Rx is at
Figure BDA00030319207500000519
Gain of vertical polarization in direction
Figure BDA00030319207500000520
And horizontally polarized gain
Figure BDA00030319207500000521
The calculation method is the same, and is not described herein again.
S05: using vertical polarisation gain
Figure BDA00030319207500000522
Gain of horizontal polarization
Figure BDA00030319207500000523
Vertical polarization gain
Figure BDA00030319207500000524
And horizontally polarized gain
Figure BDA00030319207500000525
Calculating the transmit-receive polarization mismatch xpol of Tx and Rx and the spatial path loss L caused by Tx and Rx passing through a short-range line.
Preferably, in an exemplary embodiment, the calculation formula for calculating the Tx and Rx transmit-receive polarization mismatch xpol is as follows:
Figure BDA00030319207500000526
Figure BDA00030319207500000527
Figure BDA00030319207500000528
wherein G isTFor transmitting antenna gain, GRIn order to receive the gain of the antenna,
Figure BDA00030319207500000529
being the unit directional vector of the vertical polarization of the receiving antenna,
Figure BDA00030319207500000530
is the unit directional vector of the horizontal polarization of the receiving antenna.
Preferably, in an exemplary embodiment, the spatial path loss L caused by Tx and Rx passing through the short-range line is calculated by:
Figure BDA00030319207500000531
wherein G isTFor transmitting antenna gain, GRIn order to gain the receiving antenna, lambda is the wavelength, and trip is the length of the short-range line of the transmitting and receiving antenna around the surface of the platform.
S06: and obtaining the antenna isolation C by utilizing the transmitting-receiving polarization mismatch xpol and the spatial path loss L.
Preferably, in an exemplary embodiment, the calculation formula for obtaining the antenna isolation C by using the transmit-receive polarization mismatch xpol and the spatial path loss L is as follows:
C＝xpol+L。
preferably, in an exemplary embodiment, the unit of the transmit-receive polarization mismatch xpol, the spatial path loss L, and the antenna isolation C are all dB.
Based on any of the above method exemplary embodiments, a further exemplary embodiment of the present invention provides a storage medium having stored thereon computer instructions, which when executed perform the steps of the antenna isolation prediction method based on the transmit-receive antenna near-field test data.
Based on any of the above method exemplary embodiments, a further exemplary embodiment of the present invention provides an apparatus, which includes a memory and a processor, the memory stores computer instructions executable on the processor, and the processor executes the computer instructions to perform the steps of the antenna isolation prediction method based on near-field test data of a transmitting and receiving antenna.
Based on such understanding, the technical solutions of the present embodiments may be essentially implemented or make a contribution to the prior art, or may be implemented in the form of a software product stored in a storage medium and including several instructions for causing an apparatus to execute all or part of the steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
It is to be understood that the above-described embodiments are illustrative only and not restrictive of the broad invention, and that various other modifications and changes in light thereof will be suggested to persons skilled in the art based upon the above teachings. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.

Claims (10)

1. An antenna isolation degree prediction method based on near-field test data of a receiving and transmitting antenna is characterized by comprising the following steps: the method comprises the following steps:
loading a platform model;
calculating the shortest path, namely the short-range line, from the position point Tx of the transmitting antenna on the platform to the position point Rx of the receiving antenna around the geometric surface, and according to the shortest pathRay incidence direction at line extraction Tx
Figure FDA0003031920740000011
And the ray exit direction at Rx
Figure FDA0003031920740000012
And extracting the length trip of the geodesic;
extracting discrete grid files wrapping a transmitting antenna aperture box and discrete grid files wrapping a receiving antenna aperture box from near-field test data, and extracting an electric field and a magnetic field on each grid node;
converting near field test data to Tx at
Figure FDA0003031920740000013
Gain of vertical polarization in direction
Figure FDA0003031920740000014
And horizontally polarized gain
Figure FDA0003031920740000015
And Rx is at
Figure FDA0003031920740000016
Gain of vertical polarization in direction
Figure FDA0003031920740000017
And horizontally polarized gain
Figure FDA0003031920740000018
Using vertical polarisation gain
Figure FDA0003031920740000019
Gain of horizontal polarization
Figure FDA00030319207400000110
Vertical polarization gain
Figure FDA00030319207400000111
And horizontally polarized gain
Figure FDA00030319207400000112
Calculating the receiving and transmitting polarization mismatch xpol of Tx and Rx and the spatial path loss L caused by the Tx and Rx passing through a short-range line;
and obtaining the antenna isolation C by utilizing the transmitting-receiving polarization mismatch xpol and the spatial path loss L.
2. The antenna isolation prediction method based on the near-field test data of the transmitting and receiving antenna as claimed in claim 1, wherein: the loading platform model comprises:
and extracting a point list and a point connection list of the CAD grid model from the platform surface element file in the nastran format.
3. The antenna isolation prediction method based on the near-field test data of the transmitting and receiving antenna as claimed in claim 1, wherein: the converting near field test data to Tx is described
Figure FDA00030319207400000113
Gain of vertical polarization in direction
Figure FDA00030319207400000114
And horizontally polarized gain
Figure FDA00030319207400000115
The method for extrapolating by adopting the near-far field specifically comprises the following steps:
by
Figure FDA00030319207400000116
And
Figure FDA00030319207400000117
to obtain
Figure FDA00030319207400000118
By
Figure FDA00030319207400000119
Obtaining the coordinate value of the spherical coordinate system by coordinate transformation
Figure FDA00030319207400000120
Figure FDA00030319207400000121
In order to be the azimuth angle,
Figure FDA00030319207400000122
is an inclination angle; will be provided with
Figure FDA00030319207400000123
Substituting into a calculation formula to obtain an edge
Figure FDA00030319207400000124
Directional horizontally polarized electromagnetic wave far field
Figure FDA00030319207400000125
And edge
Figure FDA00030319207400000126
Far field of vertically polarized electromagnetic wave in direction
Figure FDA00030319207400000127
The calculation formula is as follows:
Figure FDA00030319207400000128
Figure FDA00030319207400000129
where R represents the far field observation radius, k represents the free space wave velocity, n represents the near field grid bin normal vector, E represents the electric field over the S' bin,
Figure FDA00030319207400000130
representing the horizontally polarized far field, H represents the magnetic field on the S' bin,
Figure FDA00030319207400000131
is the unit directional vector of the transmit antenna vertical polarization,
Figure FDA00030319207400000132
is the unit directional vector of the transmit antenna horizontal polarization,
Figure FDA00030319207400000133
the unit vector in the radial direction of the transmitting antenna,
Figure FDA00030319207400000134
Figure FDA00030319207400000135
s ' is the surface of an area wrapped by the antenna aperture box, and r ' is a vector of any point on S ';
to obtain
Figure FDA00030319207400000136
And
Figure FDA00030319207400000137
the far field data result at any angle after the extrapolation of the near field and the far field is obtained;
integrating the power of the electric field on the surface of the wrapped Tx to obtain the radiation power P, and converting the radiation power P into a gain coefficient GnormAnd normalizing the electric field to obtain
Figure FDA0003031920740000021
And
Figure FDA0003031920740000022
Figure FDA0003031920740000023
Figure FDA0003031920740000024
Figure FDA0003031920740000025
Figure FDA0003031920740000026
said Rx is at
Figure FDA0003031920740000027
Gain of vertical polarization in direction
Figure FDA0003031920740000028
And horizontally polarized gain
Figure FDA0003031920740000029
The same way of calculation.
4. The antenna isolation prediction method based on near-field test data of the transmitting and receiving antenna as claimed in claim 3, wherein: the calculation formula for calculating the transmit-receive polarization mismatch xpol of Tx and Rx is as follows:
Figure FDA00030319207400000210
Figure FDA00030319207400000211
Figure FDA00030319207400000212
wherein G isTFor transmitting antenna gain, GRIn order to receive the gain of the antenna,
Figure FDA00030319207400000213
being the unit directional vector of the vertical polarization of the receiving antenna,
Figure FDA00030319207400000214
is the unit directional vector of the horizontal polarization of the receiving antenna.
5. The antenna isolation prediction method based on near-field test data of the transmitting and receiving antenna as claimed in claim 4, wherein: the calculation formula of the spatial path loss L caused by the Tx and Rx passing through the short-range line is as follows:
Figure FDA00030319207400000215
wherein G isTFor transmitting antenna gain, GRIn order to receive antenna gain, λ is the wavelength, and trtp is the length of the short-range line of the transceiver antenna around the surface of the platform.
6. The method for predicting the antenna isolation based on the near-field test data of the transmitting and receiving antenna as claimed in claim 1, 4 or 5, wherein: the calculation formula for obtaining the antenna isolation C by using the transmit-receive polarization mismatch xpol and the spatial path loss L is as follows:
C＝xpol+L。
7. the antenna isolation prediction method based on near-field test data of the transceiving antennas according to claim 6, wherein: the unit of the transmitting-receiving polarization mismatch xpol, the spatial path loss L and the antenna isolation C is dB.
8. The antenna isolation prediction method based on the near-field test data of the transmitting and receiving antenna as claimed in claim 1, wherein: the platform is a flying platform.
9. A storage medium having stored thereon computer instructions, characterized in that: the computer instructions when executed perform the steps of the antenna isolation prediction method based on the near-field test data of the transmitting and receiving antenna as claimed in any one of claims 1 to 8.
10. An apparatus comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor executes the computer instructions to perform the steps of the method for antenna isolation prediction based on near-field test data of transmit and receive antennas of any one of claims 1 to 8.
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CN113809538A (en) * 2021-09-30 2021-12-17 北京航空航天大学 Antenna direction adjusting method and device without hard limit in electromagnetic environment test

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