CN101320062B - Antenna phase center measuring method based on moving reference point - Google Patents
Antenna phase center measuring method based on moving reference point Download PDFInfo
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Abstract
The invention discloses a method for measuring the phase center of an antenna, which is based on moving reference points. The method provided by the invention mainly solves the measuring problems of manual operation and artificial judgment. The method includes the following steps: in the measuring system, a measured antenna is adjusted to face an original antenna and is taken as the zero point of a measuring angle; the horizontal direction and the vertical direction of a two-dimensional translation device are controlled to reset and taken as the datum reference point of the phase center test; related parameter information is input and all moving shafts are controlled automatically, thereby collecting the amplitude and phase data of the measured antenna; the horizontal deviation and the longitudinal deviation of the phase center can be worked out by using the least square method and then can be determined whether the deviation of the phase center meets the deviation requirements of the designed phase center of the antenna; if not, the reference point of the antenna can be changed by automatically adjusting the horizontal coordinate and the vertical coordinate of the two-dimensional translation device according to the deviation value; the test can be repeated again and again until the horizontal deviation and the longitudinal deviation meet the requirements; and the final changed reference point can be taken as the phase center of the measured antenna. The method provided by the invention can automatically and accurately measure the phase center of an antenna.
Description
Technical field
The invention belongs to field of measuring technique, particularly a kind of measuring method that relates to antenna phase center can be used for antenna phase center is accurately measured.
Background technology
Development along with communication, radar, artificial satellite and aerospace flight technology, tracking, setting accuracy to antenna require more and more higher, the amplitude wave beam of depending merely on is searched for the location and can not be met the demands, must be that benchmark is accurately located or measured with the phase center of antenna.And the phase center problem of antenna use, form in its phase measurement wave beam detect receive use, as interferometer array unit and all very important as all many-sides such as feed use of parabola antenna.So-called antenna phase center is exactly the equivalent radiation center of antenna.Concerning most antennas, may there be so definite phase center, but many antennas can find such reference point, make that the phase place of radiation field keeps constant relatively in a certain scope of main lobe, then this reference point just is called as " apparent phase center ".When GPS and radar fix, measurement, navigation, be benchmark often with the apparent phase center, but during operation, the installation of antenna but is to be benchmark with the geometric center, will produce the error of geometric center and apparent phase center like this, and this error will inevitably be brought harmful effect to practical application, therefore must accurately demarcate antenna phase center.
At present, mainly contain following several research about how making things convenient for, accurately demarcating antenna phase center: 1. people such as American scholar Schupler 1994 delivers the paper of " Signal characteristics of GPS user antennas " at Journal of The Institute of Navigation magazine, proposes to carry out in microwave dark room the method that antenna phase center is demarcated first.But this scaling method needs continuous manual adjustment aerial position, not only to waste time and energy relatively till the symmetry up to the phase center directional diagram, and not easy to operate, and calibration error is big.
2. " the phase center method of testing of introducing on " antenna measurement technology " books of the prosperous commonplace professor's work of antenna measurement handbook and Chengdu University of Electronic Science and Technology woods of people such as professor Mao Naihong of Xian Electronics Science and Technology University work.These methods need be adjusted aerial position by artificial continuous observation equally, and calibration error is big.
3.2002 year American scholar A.Prata delivers the scaling method that the paper of " Misalignedantenna phase-center determination using measured phase patterns " proposes another kind of antenna phase center at IPN Progress Report, this method has been set up the functional relation of phase pattern measurement with the phase center deviation, utilizes the solving equation group to find the solution the phase center deviation.But this method has certain limitation, only is suitable for existing the antenna calibration of determining phase center.
Summary of the invention
The objective of the invention is to solve existing the demarcate continuous manual adjustment aerial position of method needs of antenna phase center, artificial observation judgement, waste time and energy, not easy to operate and problem that calibration error is big, a kind of antenna phase center measuring method based on moving reference point has been proposed, to realize accurate demarcation to antenna.
The object of the present invention is achieved like this:
1. antenna phase center measurement mechanism
To any antenna, certain component of its far region radiation field can be write following form at spherical coordinate system:
Antenna is when carrying out the phase center measurement or in use, its phase center has departed from geometric center, and as shown in Figure 1, promptly the reference point of antenna moves to O ' from O, and according to far-field approximation, obtaining with O ' is the far field expression formula of reference point:
Order
The phase heart of antenna and the deviation small vector of center of rotation
Be expressed as:
These are 5 years old) formula is for being the phase pattern function of reference point with o ', and
It is exactly by change Δ x that phase pattern function when overlapping with rotation center for reference center, phase center are measured, Δ y, and Δ z is moving reference point o ', makes
The rate of change minimum, thereby seek phase center.
These are 5 years old) formula shows the phase (θ of measurement, φ) only responsive to the phase center deviation ratio in this measurement face, that is to say when φ=0 ° the phase (θ of measurement, 0 °) only be subjected to Δ x, the influence that Δ z changes, and the phase (θ, 90 °) of the measurement face of φ=90 ° only is subjected to Δ y, the influence of Δ z, can be used to measure Δ x based on this relation, Δ y, Δ z.When tested antenna is desirable sphere wave source, then
And the actual antennas majority is not desirable sphere wave source, looses but have mutually.But can think in a certain cross section, in the main lobe scope
Measure the apparent phase heart.
Suppose that now the phase pattern measurement fixes on φ=0 ° and φ=90 ° face carries out, then 5) formula is reduced to:
In the formula, Δ t represents Δ x or Δ y, when Δ x ° is represented in φ=0, when Δ y ° is represented in φ=90.
By 6) formula can obtain the relation of certain cross section Δ t, Δ z and phase deviation, i.e. far-field phase poor on far-field phase on certain direction and the greatest irradiation direction:
Φ(θ)=ψ(θ)-k(Δtsinθ+Δzcosθ) 7)
To this 7) formula uses least square method, can obtain phase center deviation delta t, Δ z, can record Δ z value respectively in φ=0 ° with during φ=90 °, and their is possible inequality, put into practice to show selection
Can obtain higher precision.
2. measuring method
The present invention is based on above-mentioned measurement mechanism, propose to measure the measuring method of antenna phase center, comprise following process:
(1). tested antenna and source antenna are installed on measuring system, are adjusted tested antenna and source antenna and aim at, as the zero point of measured angular;
(2) control and the data processing software of operation computer subsystem, horizontal and vertical the resetting of control two-dimensional translation device, guarantee the orientation turning axle and receive polarizer turning axle perpendicular quadrature, and with the reference point of this perpendicular quadrature point as the phase center test;
The parameter information of the angular range of (3) input test frequency, measurement and the stepping angle of measurement, automatically control each kinematic axis motion by control and data processing software, and control reception emission subsystem is finished amplitude, phase data collection to a certain cross section of tested antenna;
(4) according to the amplitude of being gathered, phase data, use least square method, by antenna phase deviation formula: Φ (θ)=ψ (θ)-k (Δ tsin θ+Δ zcos θ), obtain the phase center lateral deviation Δ t and the along track bias Δ z of this measured section, wherein, Φ (θ) is the poor of far-field phase on far-field phase on certain direction and the greatest irradiation direction; ψ (θ) for reference center when overlapping with rotation center far-field phase and the greatest irradiation direction on the far-field phase error that causes of position deviation poor, k is the wave number of free space, k=2 π/λ;
(5) by lateral deviation Δ t that obtains and along track bias Δ z, judge whether this deviation satisfies the deviation requirement of Antenna Design phase center, if do not meet the deviation requirement, by control and data processing software according to deviate adjust automatically the two-dimensional translation device laterally, along slope coordinate, to change the reference point of antenna;
(6) repeating step (3)~(5), till lateral deviation Δ t and along track bias Δ z met Deviation Design and require, the reference point after change this moment was the phase center of tested this testing section of antenna;
(7) angle that change to receive polarizer and transmitter polarizer by control and data processing software is to change the cross section of tested antenna and source antenna, and the phase center test to other cross section of tested antenna is finished in repeating step (3)~(6).
Above-mentioned measuring method, wherein step (5) described judgement lateral deviation Δ t and along track bias Δ z, if measure the deviation requirement that meets the Antenna Design phase center for the first time, then the reference point that step (2) is determined is as the phase center of tested this testing section of antenna.
Above-mentioned measuring method, wherein the described amplitude to a certain cross section of tested antenna of step (3), phase data collection are carried out according to the following procedure;
At first, the parameter information of the stepping angle of the angular range of incoming frequency, measurement, measurement;
Secondly, control each kinematic axis motion by control computer by the movement locus of predetermined tested antenna cross section phase center test, send out trigger pip according to the stepping angle of measuring to vector network analyzer, the control vector network analyzer is finished amplitude, the phase data collection in a certain cross section of tested antenna;
Then, this image data is saved as data file with text mode, calls so that follow-up data is handled.
Above-mentioned measuring method, wherein described control of step (5) and data processing software according to deviate adjust automatically the two-dimensional translation device laterally, along slope coordinate, to change the reference point of antenna, carry out according to the following procedure;
(5a) as if the deviation requirement of lateral deviation Δ t greater than the Antenna Design phase center, send out the position move for servo driving digital display subsystem by control and data processing software, servo-driver is controlled the horizontal gear train of driven by servomotor, makes the horizontal mobile deviation delta t of two-dimensional translation device;
(5b) as if the deviation requirement of along track bias Δ z greater than the Antenna Design phase center, send out the position move by control and data processing software to watching driving digital display subsystem, servo-driver control driven by servomotor second gear train, what make the two-dimensional translation device vertically moves deviation delta z;
(5c) with horizontal mobile deviation delta t and vertically move the position at deviation delta z place as new reference point.
The present invention tests and calculates the technical scheme of phase center deviation again owing to adopt the reference point of adjusting tested antenna by computer controlled automatic, has overcome the manual adjustment aerial position and has judged the problem of its measurement result accuracy difference with artificial the observation; Test result and error analysis show: the model approximation error that the antenna installation deviation is introduced is a main error source, method of testing of the present invention is by 2-3 the change to reference point, just can reduce this error, obtain higher phase center measuring accuracy, its measured result is better than 1mm.This method not only can accurately be measured the antenna phase center position deviation, and measuring process sequencing, robotization, does not need manual operation, artificially judges.
Feature of the present invention and effect can further specify by the following drawings and example.
Description of drawings
Fig. 1 is tested antenna moving reference point synoptic diagram;
Fig. 2 is a test macro block diagram of the present invention;
Fig. 3 is a test process block diagram of the present invention;
Fig. 4 is experiment test of the present invention antenna phase center once figure as a result;
Fig. 5 is the antenna phase center figure as a result of experiment test secondary of the present invention;
Fig. 6 is the antenna phase center figure as a result of experiment test of the present invention three times.
Embodiment
With reference to Fig. 2, test macro of the present invention comprises that mainly antenna receives turntable subsystem, emission polarizer subsystem, emission receiving subsystem, servo driving digital display subsystem and five parts of computer subsystem.Wherein, described antenna receives the turntable subsystem, and it is one of critical component of measuring system, its effect is that antenna to be measured is installed, accurately change the machinery of antenna and point to, adjust the relative position of antenna and rotating shaft, so that determine the phase center of antenna accurately in the space.This antenna receives the turntable subsystem and mainly is made up of azimuth rotating platform, two-dimensional translation device and antenna polarization device, this two-dimensional translation device is positioned on the azimuth rotating platform, be connected with the antenna polarization device by support, be used for regulating automatically the position of antenna and azimuth rotating platform rotating shaft, make the turning axle axle center of the phase center of tested antenna and turntable approaching, and guarantee that the position between the azimuth rotating platform rotating shaft and the rotating shaft of antenna polarization device is relatively stable when azimuth rotating platform rotates.This azimuth rotating platform, antenna polarization device and two-dimensional translation device are by computer controlled automatic.Described emission polarizer subsystem comprises transmitter and emission support, is used to set up emitting antenna, changes the emitting antenna polarization by computer program-control, by the height of manual adjustment emitting antenna.Described emission receiving subsystem is made up of vector network analyzer, is used to produce the high-frequency test signal, and treats the amplitude of the field intensity that the observation line receives and phase information and show and read.Described servo driving digital display subsystem comprises positioner and position indicator, is used for the driving of each position Control Shaft and the position of each kinematic axis and shows in real time.Described computer subsystem is the command centre of measuring system, and each kinematic axis moves according to desired trajectory under the unified command of computer subsystem, controls vector network analyzer simultaneously and samples.This computer subsystem comprises: control computer, digital display control card, GPIB card, multiaxis control card able to programme and control and data processing software, described these control cards are inserted in the interface slot of control computer.Control computer shows the positional information of each kinematic axis in real time on position indicator by the digital display control card; Control computer is by GPIB card control emission receiving subsystem and finish amplitude, phase data collection; Control computer is sent out the position move by multiaxis control card able to programme to watching driving digital display subsystem, realizes the position control of each kinematic axis.Control and data processing software are finished under the test mode each drive controlling of tested antenna and reference antenna, by the GPIB card to the setting of emission receiving subsystem and control and under test mode to the collection and the storage of amplitude, phase information, and carry out analyzing and processing, and carry out that the result shows or the output of printing, draw to measuring the radiation characteristic obtained.
More than the annexation of five subsystems be: antenna receives the turntable subsystem and is connected with servo driving digital display subsystem with the emission receiving subsystem respectively, emission polarizer subsystem is connected with servo driving digital display subsystem with the emission receiving subsystem respectively, computer subsystem is connected with emission receiving subsystem, servo driving digital display subsystem respectively, wherein the two-dimensional translation device is connected with positioner is two-way, the emission polarizer is connected with positioner is two-way, and the emission polarizer is connected with network analyzer is unidirectional.
With reference to Fig. 3, the process at test phase of the present invention center is as follows:
Step 1. determine the zero point of measured angular.
Tested antenna and source antenna are installed on measuring system, are adjusted tested antenna and source antenna it is aimed at, and with the zero point of this alignment point as measured angular.
Step 2 is determined the reference point at test phase center.
The control and the data processing software of operation computer subsystem, make the two-dimensional translation device laterally, vertically reset respectively, with assurance orientation turning axle and reception polarizer turning axle perpendicular quadrature, and with the reference point of this perpendicular quadrature point as the phase center test.
Step 3 is gathered amplitude, the phase data in a cross section of tested antenna.
At first, the parameter information of the stepping angle of the angular range of incoming frequency, measurement, measurement;
Secondly, control each kinematic axis motion by control computer by the movement locus of predetermined tested antenna cross section phase center test, send out trigger pip according to the stepping angle of measuring to vector network analyzer, the control vector network analyzer is finished amplitude, the phase data collection in a certain cross section of tested antenna;
Then, this image data is saved as data file with text mode, calls so that follow-up data is handled.
Step 4 is obtained the phase center lateral deviation Δ t and the along track bias Δ z of measured section.
By control and data processing software according to the amplitude of being gathered, phase data, use least square method, by antenna phase deviation formula: Φ (θ)=ψ (θ)-k (Δ tsin θ+Δ zcos θ), obtain the phase center lateral deviation Δ t and the along track bias Δ z of this measured section, and this deviate is presented on the program interface; Wherein, Φ (θ) is the poor of far-field phase on far-field phase on certain direction and the greatest irradiation direction; ψ (θ) for reference center when overlapping with rotation center far-field phase and the greatest irradiation direction on the far-field phase error that causes of position deviation poor, k is the wave number of free space, k=2 π/λ.
Phase center deviation requirement according to Antenna Design, lateral deviation Δ t and the along track bias Δ z that is obtained judged, if lateral deviation Δ t is greater than the deviation requirement of Antenna Design phase center, send out the position move for servo driving digital display subsystem by control and data processing software, by the horizontal gear train of driver control driven by servomotor, make the horizontal mobile deviation delta t of two-dimensional translation device; If along track bias Δ z is greater than the deviation requirement of Antenna Design phase center, send out the position move by control and data processing software to watching driving digital display subsystem, by the vertical gear train of servo-driver control driven by servomotor, what make the two-dimensional translation device vertically moves deviation delta z, to change the reference point of antenna; Repeating step (3)~step (5) is till lateral deviation Δ t and along track bias Δ z meet Deviation Design and require.
As final reference point, this final reference point is the phase center of tested this testing section of antenna with the final position of laterally moving and vertically moving the place that adds up of gear train.
Step 7 is finished the phase center test to other cross section of tested antenna.
After the phase center in a cross section of tested antenna tests, test the phase center in other cross sections if desired, then change the angle that receives polarizer and transmitter polarizer by control and data processing software earlier, to change the cross section of tested antenna and source antenna, the phase center test to other cross section of tested antenna is finished in repeating step (3)~(6) again.
Need to prove that if judge that lateral deviation Δ t and along track bias Δ z meet the deviation requirement of Antenna Design phase center for the first time in the step 5, then the reference point that step 2 is determined is as the phase center of tested this testing section of antenna.
Effect of the present invention can further specify by measured result.
According to test process of the present invention the phase center in a cross section of tested antenna is carried out actual test, test result is:
For the first time measure amplitude, phase pattern such as Fig. 4 a, according to amplitude, phase data, calculating the interior phase center side-play amount of angular domain scope [60 °, 60 °] is Δ t=-6.656mm, and Δ z=99.635mm is as Fig. 4 b.
By above-mentioned Δ t=-6.656mm, after the side-play amount of Δ z=99.635mm is controlled the two-dimensional translation device automatically and is moved, measure for the second time amplitude, phase pattern such as Fig. 5 a, calculate [60 ° of angular domain scopes, 60 °] interior phase center side-play amount is Δ t=-7.724mm, Δ z=-0.558mm is as Fig. 5 b.
Press Δ t=-7.724mm, after the side-play amount of Δ z=-0.558mm is controlled the two-dimensional translation device automatically and is moved, measure amplitude, phase pattern such as Fig. 6 a for the third time, calculating the interior phase center side-play amount of angular domain scope [60 °, 60 °] is Δ t=0.059mm, Δ z=-0.455mm, this deviation is less than ± 1mm, meet the deviation requirement of Antenna Design phase center, as Fig. 6 b, from Fig. 6 b as can be seen phase pattern be approximately a cophasal surface.
As final reference point, this final reference point is exactly the phase center of tested this testing section of antenna with above-mentioned position after moving three side-play amounts and adding up.
Can obtain result preferably through maximum three measurements as can be seen from measurement pattern, result of calculation.
Claims (1)
1. measuring method based on the antenna phase center of moving reference point comprises following process:
(1) tested antenna and source antenna are installed on measuring system, are adjusted tested antenna and source antenna it is aimed at, and with the zero point of this alignment point as measured angular;
(2) control and the data processing software of operation computer subsystem, horizontal and vertical the resetting of control two-dimensional translation device, guarantee the orientation turning axle and receive polarizer turning axle perpendicular quadrature, and with the reference point of this perpendicular quadrature point as the phase center test;
The parameter information of the angular range of (3) input test frequency, measurement and the stepping angle of measurement, automatically control each kinematic axis motion by control and data processing software, and control reception emission subsystem is finished amplitude, phase data collection to a certain cross section of tested antenna according to the following procedure:
At first, the parameter information of the stepping angle of the angular range of incoming frequency, measurement, measurement;
Secondly, control each kinematic axis motion by control computer by the movement locus of predetermined tested antenna cross section phase center test, send out trigger pip according to the stepping angle of measuring to vector network analyzer, the control vector network analyzer is finished amplitude, the phase data collection in a certain cross section of tested antenna;
Then, this image data is saved as data file with text mode, calls so that follow-up data is handled;
(4) according to the amplitude of being gathered, phase data, use least square method, by antenna phase deviation formula: Φ (θ)=ψ (θ)-k (Δ tsin θ+Δ zcos θ), obtain the phase center lateral deviation Δ t and the along track bias Δ z of this measured section, wherein, Φ (θ) is the poor of far-field phase on far-field phase on certain direction and the greatest irradiation direction; ψ (θ) for reference center when overlapping with rotation center far-field phase and the greatest irradiation direction on the far-field phase error that causes of position deviation poor, k is the wave number of free space, k=2 π/λ;
(5) by lateral deviation Δ t that obtains and along track bias Δ z, judge whether lateral deviation Δ t and along track bias Δ z satisfy the deviation requirement of Antenna Design phase center, if judge that lateral deviation Δ t and along track bias Δ z meet the deviation requirement of Antenna Design phase center for the first time, then the reference point that step (2) is determined is as the phase center of tested this testing section of antenna; If do not meet the deviation requirement, by control and data processing software according to deviate adjust automatically according to the following procedure the two-dimensional translation device laterally, along slope coordinate, to change the reference point of tested antenna:
(5a) as if the deviation requirement of lateral deviation Δ t greater than the Antenna Design phase center, send out the position move for servo driving digital display subsystem by control and data processing software, servo-driver is controlled the horizontal gear train of driven by servomotor, makes the horizontal mobile deviation delta t of two-dimensional translation system;
(5b) as if the deviation requirement of along track bias Δ z greater than the Antenna Design phase center, send out the position move for servo driving digital display subsystem by control and data processing software, the vertical gear train of servo-driver control driven by servomotor, what make the two-dimensional translation system vertically moves deviation delta z;
(5c) with horizontal mobile deviation delta t and vertically move the position at deviation delta z place as new reference point;
(6) repetitive process (3)~(5), till lateral deviation Δ t and along track bias Δ z met Deviation Design and require, the reference point after change this moment was the phase center of tested this testing section of antenna;
(7) angle that change to receive polarizer and transmitter polarizer by control and data processing software is to change the cross section of tested antenna and source antenna, and the phase center test to other cross section of tested antenna is finished in repetitive process (3)~(6).
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