CN113111524B - Antenna isolation degree prediction method based on far field test, storage medium and device - Google Patents

Antenna isolation degree prediction method based on far field test, storage medium and device Download PDF

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CN113111524B
CN113111524B CN202110430904.8A CN202110430904A CN113111524B CN 113111524 B CN113111524 B CN 113111524B CN 202110430904 A CN202110430904 A CN 202110430904A CN 113111524 B CN113111524 B CN 113111524B
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antenna
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CN113111524A (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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Abstract

The invention discloses an antenna isolation degree prediction method, a storage medium and a device based on receiving and transmitting antenna far-field test data, wherein the method comprises the following steps: calculating the shortest path, i.e. short-range line, around the geometric surface from the transmitting antenna position point Tx to the receiving antenna position point Rx on the platform, and extracting the ray incidence direction at Tx
Figure DDA0003031425910000011
And the ray exit direction at Rx
Figure DDA0003031425910000012
Extracting antenna far field gain data of each angle network on the calculation discrete frequency spherical surface from the far field test data; calculating Tx at
Figure DDA0003031425910000013
Gain of vertical polarization in direction
Figure DDA0003031425910000014
And horizontally polarized gain
Figure DDA0003031425910000015
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. The invention calculates the antenna isolation of the far-field test data of the receiving and transmitting antenna based on the UTD in the prior art, and considers the influence of the ray direction on the antenna gain and polarization isolation on the receiving and transmitting positions, thereby ensuring that the antenna isolation is realizedThe isolation prediction is more accurate.

Description

Antenna isolation degree prediction method based on far field test, storage medium and device
Technical Field
The invention relates to computational electromagnetism, in particular to an antenna isolation degree prediction method, a storage medium and a device based on receiving and transmitting antenna far-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 far field test data to calculate 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.
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 far-field test data.
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 transmit-receive antenna far-field test data is provided, which includes 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 on the platform around the geometric surface, and extracting the ray incidence direction at the Tx according to the shortest path line
Figure GDA0003201901220000011
And the ray exit direction at Rx
Figure GDA0003201901220000012
And extracting the length trip of the geodesic;
extracting antenna far-field gain data of each angle network on the calculation discrete frequency spherical surface from the far-field test data, extracting gain data of a transmitting antenna from the transmitting antenna test data, and extracting gain data of a receiving antenna from the receiving antenna test data;
calculating Tx at
Figure GDA0003201901220000013
Gain of vertical polarization in direction
Figure GDA0003201901220000014
And horizontally polarized gain
Figure GDA0003201901220000015
And calculating Rx at
Figure GDA0003201901220000016
Gain of vertical polarization in direction
Figure GDA0003201901220000017
And horizontally polarized gain
Figure GDA0003201901220000018
Using vertical polarisation gain
Figure GDA0003201901220000019
Gain of horizontal polarization
Figure GDA00032019012200000110
Vertical polarization gain
Figure GDA00032019012200000111
And horizontally polarized gain
Figure GDA00032019012200000112
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 calculating Tx is at
Figure GDA0003201901220000021
Gain of vertical polarization in direction
Figure GDA0003201901220000022
And horizontally polarized gain
Figure GDA0003201901220000023
Adopting interpolation calculation, including:
constructing vertical polarization gain
Figure GDA0003201901220000024
Two-dimensional structural grid and horizontally polarized gain
Figure GDA0003201901220000025
A two-dimensional structural grid of (a); constructed separately
Figure GDA0003201901220000026
And
Figure GDA0003201901220000027
two-dimensional interpolation function transformed along with coordinate value of spherical coordinate system
Figure GDA0003201901220000028
And
Figure GDA0003201901220000029
theta is the azimuth angle，
Figure GDA00032019012200000210
Is an inclination angle;
by
Figure GDA00032019012200000211
And
Figure GDA00032019012200000212
to obtain
Figure GDA00032019012200000213
And is composed of
Figure GDA00032019012200000214
Obtaining the coordinate value of the spherical coordinate system by coordinate transformation
Figure GDA00032019012200000215
Wherein
Figure GDA00032019012200000216
Is the unit directional vector of the transmit antenna vertical polarization,
Figure GDA00032019012200000217
is the unit directional vector of the transmit antenna horizontal polarization,
Figure GDA00032019012200000218
the unit vector in the radial direction of the transmitting antenna,
Figure GDA00032019012200000219
will be provided with
Figure GDA00032019012200000220
Substituted into said two-dimensional interpolation function
Figure GDA00032019012200000221
And
Figure GDA00032019012200000222
to obtain
Figure GDA00032019012200000223
And
Figure GDA00032019012200000224
the calculation Rx is at
Figure GDA00032019012200000225
Gain of vertical polarization in direction
Figure GDA00032019012200000226
And horizontally polarized gain
Figure GDA00032019012200000227
The same way of calculation.
Further, the calculation formula for calculating Tx and Rx transmit-receive polarization mismatch xpol is:
Figure GDA00032019012200000228
Figure GDA00032019012200000229
Figure GDA00032019012200000230
wherein G isTFor transmitting antenna gain, GRIn order to receive the gain of the antenna,
Figure GDA00032019012200000231
being the unit directional vector of the vertical polarization of the receiving antenna,
Figure GDA00032019012200000232
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 GDA00032019012200000233
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, which when executed perform the steps of the method for predicting antenna isolation based on far-field test data of a transmitting and receiving antenna.
In a third aspect of the present invention, an apparatus is provided, which includes a memory and a processor, the memory storing computer instructions executable on the processor, the processor executing the computer instructions to perform the steps of the method for predicting antenna isolation based on far-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 far-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, so that the isolation prediction is more accurate.
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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 vector-oriented schematic illustration of gain as disclosed in an exemplary embodiment of the present invention;
fig. 5 is a grid diagram of a constructed far-field gain interpolation structure according to an exemplary embodiment of the disclosure.
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 far-field test data of a transmitting-receiving antenna provided in 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 GDA0003201901220000041
And the ray exit direction at Rx
Figure GDA0003201901220000042
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: antenna far-field gain data of angle grids on each calculation discrete frequency spherical surface is extracted from the far-field test data, gain data of a transmitting antenna is extracted from the transmitting antenna test data, and gain data of a receiving antenna is extracted from the receiving antenna test data.
S04: calculating Tx at
Figure GDA0003201901220000043
Gain of vertical polarization in direction
Figure GDA0003201901220000044
And horizontally polarized gain
Figure GDA0003201901220000045
And calculating Rx at
Figure GDA0003201901220000046
Gain of vertical polarization in direction
Figure GDA0003201901220000047
And horizontally polarized gain
Figure GDA0003201901220000048
More preferably, in an exemplary embodiment, the calculating Tx is at
Figure GDA0003201901220000049
Gain of vertical polarization in direction
Figure GDA00032019012200000410
And horizontally polarized gain
Figure GDA00032019012200000411
Adopting interpolation calculation, including:
s041: constructing vertical polarization gain
Figure GDA00032019012200000412
Two-dimensional structural grid and horizontally polarized gain
Figure GDA00032019012200000413
A two-dimensional structural grid of (a); constructed separately
Figure GDA00032019012200000414
And
Figure GDA00032019012200000415
two-dimensional interpolation function transformed along with coordinate value of spherical coordinate system
Figure GDA00032019012200000416
And
Figure GDA00032019012200000417
theta is the azimuth angle，
Figure GDA00032019012200000418
Is an inclination angle;
s042: by
Figure GDA00032019012200000419
And
Figure GDA00032019012200000420
to obtain
Figure GDA00032019012200000421
And is composed of
Figure GDA00032019012200000422
Obtaining the coordinate value of the spherical coordinate system by coordinate transformation
Figure GDA00032019012200000423
Wherein
Figure GDA00032019012200000424
Is the unit directional vector of the transmit antenna vertical polarization,
Figure GDA00032019012200000425
is the unit directional vector of the transmit antenna horizontal polarization,
Figure GDA00032019012200000426
the unit vector in the radial direction of the transmitting antenna,
Figure GDA00032019012200000427
wherein, the vector direction diagram of the gain is shown in fig. 4;
s043: will be provided with
Figure GDA00032019012200000428
Substituted into said two-dimensional interpolation function
Figure GDA00032019012200000429
And
Figure GDA00032019012200000430
to obtain
Figure GDA00032019012200000431
And
Figure GDA00032019012200000432
the far field gain interpolation structure grid constructed is shown in fig. 5.
And the calculation Rx is at
Figure GDA00032019012200000433
Gain of vertical polarization in direction
Figure GDA00032019012200000434
And horizontally polarized gain
Figure GDA00032019012200000435
The calculation method is the same, and is not described herein again.
S05: using vertical polarisation gain
Figure GDA00032019012200000436
Gain of horizontal polarization
Figure GDA00032019012200000437
Vertical polarization gain
Figure GDA00032019012200000438
And horizontally polarized gain
Figure GDA00032019012200000439
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 GDA00032019012200000440
Figure GDA00032019012200000441
Figure GDA00032019012200000442
wherein G isTFor transmitting antenna gain, GRIn order to receive the gain of the antenna,
Figure GDA00032019012200000443
being the unit directional vector of the vertical polarization of the receiving antenna,
Figure GDA00032019012200000444
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 GDA0003201901220000051
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 method for antenna isolation prediction based on transmit-receive antenna far-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 having stored thereon computer instructions executable on the processor, the processor executing the computer instructions to perform the steps of the method for predicting antenna isolation based on far-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 (6)

1. An antenna isolation prediction method based on receiving and transmitting antenna far field test data is characterized in that: the method comprises the following steps:
loading a platform model;
calculating the shortest path around the geometric surface from the transmitting antenna position point Tx to the receiving antenna position point Rx on the platform, namely, a short-range line, and extracting the ray incidence direction at the Tx position according to the short-range line
Figure FDA0003201901210000011
And the ray exit direction at Rx
Figure FDA0003201901210000012
And extracting the length trip of the geodesic;
extracting antenna far-field gain data of each angle network on the calculation discrete frequency spherical surface from the far-field test data, extracting gain data of a transmitting antenna from the transmitting antenna test data, and extracting gain data of a receiving antenna from the receiving antenna test data;
calculating Tx at
Figure FDA0003201901210000013
Gain of vertical polarization in direction
Figure FDA0003201901210000014
And horizontally polarized gain
Figure FDA0003201901210000015
And calculating Rx at
Figure FDA0003201901210000016
Gain of vertical polarization in direction
Figure FDA0003201901210000017
And horizontally polarized gain
Figure FDA0003201901210000018
The calculation Tx is at
Figure FDA0003201901210000019
Gain of vertical polarization in direction
Figure FDA00032019012100000110
And horizontally polarized gain
Figure FDA00032019012100000111
Adopting interpolation calculation, including:
constructing vertical polarization gain
Figure FDA00032019012100000112
Two-dimensional structural grid and horizontally polarized gain
Figure FDA00032019012100000113
A two-dimensional structural grid of (a); constructed separately
Figure FDA00032019012100000114
And
Figure FDA00032019012100000115
two-dimensional interpolation function transformed along with coordinate value of spherical coordinate system
Figure FDA00032019012100000116
And
Figure FDA00032019012100000117
theta is the azimuth angle and theta is the azimuth angle,
Figure FDA00032019012100000118
is an inclination angle;
by
Figure FDA00032019012100000119
And
Figure FDA00032019012100000120
to obtain
Figure FDA00032019012100000121
And is composed of
Figure FDA00032019012100000122
By coordinatesTransforming to obtain the coordinate value of the spherical coordinate system
Figure FDA00032019012100000123
Wherein
Figure FDA00032019012100000124
Is the unit directional vector of the transmit antenna vertical polarization,
Figure FDA00032019012100000125
is the unit directional vector of the transmit antenna horizontal polarization,
Figure FDA00032019012100000126
the unit vector in the radial direction of the transmitting antenna,
Figure FDA00032019012100000127
will be provided with
Figure FDA00032019012100000128
Substituted into said two-dimensional interpolation function
Figure FDA00032019012100000129
And
Figure FDA00032019012100000130
to obtain
Figure FDA00032019012100000131
And
Figure FDA00032019012100000132
the calculation Rx is at
Figure FDA00032019012100000133
Gain of vertical polarization in direction
Figure FDA00032019012100000134
And horizontally polarized gain
Figure FDA00032019012100000135
The calculation mode is the same;
using vertical polarisation gain
Figure FDA00032019012100000136
Gain of horizontal polarization
Figure FDA00032019012100000137
Vertical polarization gain
Figure FDA00032019012100000138
And horizontally polarized gain
Figure FDA00032019012100000139
Calculating the receiving and transmitting polarization mismatch xpol of Tx and Rx and the spatial path loss L caused by Tx and Rx passing through a short-range line;
the calculation formula for calculating the transmit-receive polarization mismatch xpol of Tx and Rx is as follows:
Figure FDA00032019012100000140
Figure FDA00032019012100000141
Figure FDA00032019012100000142
wherein G isTFor transmitting antenna gain, GRIn order to receive the gain of the antenna,
Figure FDA00032019012100000143
being the unit directional vector of the vertical polarization of the receiving antenna,
Figure FDA00032019012100000144
a unit direction vector for horizontal polarization of the receiving antenna;
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 FDA00032019012100000145
wherein G isTFor transmitting antenna gain, GRThe gain of the receiving antenna is obtained, lambda is the wavelength, and trip is the length of a short-range line of the receiving and transmitting antenna around the surface of the platform;
obtaining an antenna isolation C by utilizing transmitting-receiving polarization mismatch xpol and spatial path loss L;
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。
2. the method for predicting the isolation of the antenna based on the far-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 method for predicting the isolation of the antenna based on the far-field test data of the transmitting and receiving antenna as claimed in claim 1, wherein: the unit of the transmitting-receiving polarization mismatch xpol, the spatial path loss L and the antenna isolation C is dB.
4. The method for predicting the isolation of the antenna based on the far-field test data of the transmitting and receiving antenna as claimed in claim 1, wherein: the platform is a flying platform.
5. A computer-readable storage medium having stored thereon computer instructions, characterized in that: the computer instructions when executed perform the steps of a method for antenna isolation prediction based on transmit-receive antenna far-field test data according to any one of claims 1 to 4.
6. An antenna isolation prediction device comprising a memory and a processor, wherein 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 the far-field test data of the transmitting and receiving antenna according to any one of claims 1 to 4.
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