CN109460604B - Electromagnetic wave polarization rapid judgment method - Google Patents
Electromagnetic wave polarization rapid judgment method Download PDFInfo
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- CN109460604B CN109460604B CN201811317877.8A CN201811317877A CN109460604B CN 109460604 B CN109460604 B CN 109460604B CN 201811317877 A CN201811317877 A CN 201811317877A CN 109460604 B CN109460604 B CN 109460604B
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
A method for rapidly judging polarization of electromagnetic waves comprises the following steps: (1) Three linear polarization vibrators perpendicular to each other form a three-dimensional vector antenna, and the three vibrators of the antenna receive signals E x (t)，E y (t)，E z (t) the pitch angle ψ and the azimuth angle θ of the signal incidence, three signal amplitudes E, can be estimated by techniques known in the art xm 、E ym 、E zm And phase differences α and β; (2) The incident electromagnetic wave electric field can be decomposed into two mutually perpendicular electric field components, namely pitch components, on a plane psi O theta perpendicular to the propagation directionAnd azimuth componentThe polarization decision is to estimate the electric field amplitude E θm 、E ψm And phase differenceCan be directly estimated by the known quantity; (3) From the estimated electric field amplitude E θm 、E ψm And phase differenceThe polarization type and parameters may be determined. The invention can rapidly estimate the polarization of the incident electromagnetic wave and can be applied to the field of polarization modulation in wireless communication.
Description
Technical Field
The invention relates to a polarization modulation technology in wireless communication, in particular to an electromagnetic wave polarization judgment method in a polarization modulation receiver.
Technical Field
The polarization characteristic of electromagnetic wave is another available important information besides time domain, frequency domain and space domain information, and as a novel digital modulation mode, polarization modulation is used for carrying baseband information by utilizing the polarization characteristic of electromagnetic wave, and different polarizations correspond to different baseband symbols. In a polar modulation receiver, it is necessary to realize judgment of the polarization characteristics of an incident electromagnetic wave at an arbitrary angle in a short symbol period. However, with the existing polarization judgment method, it is most common to use a two-dimensional orthogonal dual polarized antenna to perform polarization judgment on the electromagnetic waves incident from normal, and the judgment content is only to perform judgment on the polarization modes such as circular polarization, linear polarization, polarization rotation direction and the like, but not accurate polarization parameters. There are also techniques for implementing a method for determining polarization parameters of an incident electromagnetic wave at any angle by using a three-dimensional or six-dimensional vector antenna, but the specific implementation steps are complicated, and it is difficult to meet the real-time requirement of a polar modulation receiver. By analyzing the signal model, a direct rapid polarization characteristic judgment method can be established.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: in a polar modulation receiver, a decision on how to rapidly polarize an incident electromagnetic wave at any angle is made. The scheme for solving the technical problem is a fast judgment method for electromagnetic wave polarization, which comprises the following steps:
(1) Receiving electromagnetic waves by adopting a three-dimensional vector antenna, wherein the antenna is composed of three mutually perpendicular linear polarization vibrators, and a space rectangular coordinate system XYZ is established by the polarization directions of the three linear polarization vibrators; randomly polarized electromagnetic waves are incident on the three-dimensional vector antenna from an azimuth angle phi and a pitch angle theta; the three vibrators of the antenna receive signals of known quantity which are respectively expressed as Wherein E is xm 、E ym 、E zm Receiving electric field amplitudes in x, y and z directions respectively, < >>Receiving an initial phase of an electric field in x, y and z directions respectively, wherein omega is a signal frequency; by means of the direction of arrival estimation, psi and theta can be obtained, and by means of the full-phase FFT signal processing method E can be obtained xm 、E ym 、E zm And the phase differences alpha and beta between the three signals, wherein>
(2) According to the azimuth angle psi and pitch angle theta of electromagnetic wave incidence, the incident electromagnetic wave electric field can be decomposed into two mutually perpendicular electric field components, namely pitch components, on the plane psi O theta perpendicular to the propagation directionAnd azimuth component->Wherein E is θm And E is ψm The magnitude of the electric field component in two directions, respectively, ">And->The initial phases of the two electric field components respectively; the polarization decision is to estimate the electric field amplitude E θm 、E ψm And phase difference->The estimation formula is:
wherein a=e xm sinθcosψ、b＝E ym cosθsinψ、c＝E zm sinθ、d＝-E xm sinψ、e＝E ym cosψ；
(3) From the estimated electric field amplitude E θm 、E ψm And phase differenceThe polarization type and parameters may be determined.
The invention has the beneficial effects that in the polar modulation receiver, the polarization type and parameters of the incident electromagnetic wave at any angle can be rapidly estimated, including the parameters of circular polarization, linear polarization, elliptical polarization, spiral direction and the like, axial ratio, inclination angle and the like. The invention can be applied to the technical field of polar modulation of wireless communication.
Drawings
FIG. 1 is a flow chart of a fast electromagnetic wave polarization decision method based on a three-dimensional vector antenna;
FIG. 2 is a schematic diagram of a three-dimensional vector antenna;
FIG. 3 is a schematic diagram of signal incidence;
detailed description of the preferred embodiments
In the polarization modulation technique, different electromagnetic wave polarization characteristics carry different baseband symbol information. The polar modulation receiver needs to determine the polarization characteristics of the electromagnetic wave incident at any angle in one symbol period, wherein the characteristics comprise linear polarization, circular polarization, elliptical polarization and other types, and the axial ratio, the inclination angle and other parameters of the polarization. The method can realize the rapid judgment of the incident electromagnetic wave at any angle by utilizing the three-dimensional electromagnetic vector antenna, and the whole flow chart of the method is shown in figure 1, and comprises the following specific implementation steps:
(1) Electromagnetic waves are received by adopting a three-dimensional vector antenna, the antenna is composed of three mutually perpendicular linear polarization vibrators, and a space rectangular coordinate system XYZ is established by the polarization directions of the three linear polarization vibrators, as shown in figure 2. The electromagnetic wave of arbitrary polarization is incident on the three-dimensional vector antenna from the azimuth angle ψ and the pitch angle θ as shown in fig. 3. The three vibrators of the antenna receive signals of known quantity which are respectively expressed as Wherein E is xm 、E ym 、E zm Receiving electric field amplitudes in x, y and z directions respectively, < >>Receiving an initial phase of an electric field in x, y and z directions respectively, wherein omega is a signal frequency; by means of the direction of arrival estimation, psi and theta can be obtained, and by means of the full-phase FFT signal processing method E can be obtained xm 、E ym 、E zm And the phase differences alpha and beta between the three signals, wherein>
(2) According to the azimuth angle psi and pitch angle theta of electromagnetic wave incidence, the incident electromagnetic wave electric field can be decomposed into two mutually perpendicular electric field components, namely pitch components, on the plane psi O theta perpendicular to the propagation directionAnd azimuth component->E as shown in FIG. 3 θ 、e ψ 、e r Respectively representing a pitching direction, a azimuth direction and a propagation direction vector; wherein E is θm And E is ψm The magnitude of the electric field component in two directions, respectively, ">And->The initial phases of the two electric field components respectively; the polarization decision is to estimate the electric field amplitude E θm 、E ψm And phase difference->From the coordinate relationship we can get E θ (t)＝E x (t)sinθcosψ+E y (t)cosθsinψ-E z (t)sinθ，E φ (t)＝-E x (t)sinψ+E y (t) cos ψ. Solving the equation, the estimation formulas of the two electric field component parameters are as follows:
wherein a=e xm sinθcosψ、b＝E ym cosθsinψ、c＝E zm sinθ、d＝-E xm sinψ、e＝E ym cosψ；
(3) From the estimated electric field amplitude E θm 、E ψm And phase differenceThe polarization type and parameters may be determined.
Claims (1)
1. A method for rapidly judging polarization of electromagnetic waves comprises the following steps:
(1) Receiving electromagnetic waves by adopting a three-dimensional vector antenna, wherein the antenna is composed of three mutually perpendicular linear polarization vibrators, and a space rectangular coordinate system XYZ is established by the polarization directions of the three linear polarization vibrators; randomly polarized electromagnetic waves are incident on the three-dimensional vector antenna from an azimuth angle phi and a pitch angle theta; the three vibrators of the antenna receive signals of known quantity which are respectively expressed as Wherein E is xm 、E ym 、E zm Receiving electric field amplitudes in x, y and z directions respectively, < >>Receiving an initial phase of an electric field in x, y and z directions respectively, wherein omega is a signal frequency; by means of the direction of arrival estimation, psi and theta can be obtained, and by means of the full-phase FFT signal processing method E can be obtained xm 、E ym 、E zm And the phase differences alpha and beta between the three signals, wherein>
(2) According to the azimuth angle psi and pitch angle theta of electromagnetic wave incidence, the incident electromagnetic wave electric field can be decomposed into two mutually perpendicular electric field components, namely pitch components, on the plane psi O theta perpendicular to the propagation directionAnd azimuth component->Wherein E is θm And E is ψm The magnitude of the electric field component in two directions, respectively, ">And->The initial phases of the two electric field components respectively; the polarization decision is to estimate the electric field amplitude E θm 、E ψm And phase difference->The estimation formula is:
wherein a=e xm sinθcosψ、b＝E ym cosθsinψ、c＝E zm sinθ、d＝-E xm sinψ、e＝E ym cosψ；
(3) From the estimated electric field amplitude E θm 、E ψm And phase differenceThe polarization type and parameters may be determined.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0325034A2 (en) * | 1987-11-23 | 1989-07-26 | Her Majesty In Right Of Canada, As Represented By The Minister Of Communications | Antenna Array |
| CA2143592A1 (en) * | 1994-04-06 | 1995-10-07 | Steven Jonathan Fortune | Techniques for Expeditiously Predicting Electromagnetic Wave Propagation |
| CN102594767A (en) * | 2012-02-09 | 2012-07-18 | 复旦大学 | Three-dimensional modulation method combining polarization and amplitudes of signals in communication system |
| CN103685133A (en) * | 2013-12-24 | 2014-03-26 | 北京邮电大学 | High-order continuous polarization modulation method of improving spectral efficiency |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0325034A2 (en) * | 1987-11-23 | 1989-07-26 | Her Majesty In Right Of Canada, As Represented By The Minister Of Communications | Antenna Array |
| CA2143592A1 (en) * | 1994-04-06 | 1995-10-07 | Steven Jonathan Fortune | Techniques for Expeditiously Predicting Electromagnetic Wave Propagation |
| CN102594767A (en) * | 2012-02-09 | 2012-07-18 | 复旦大学 | Three-dimensional modulation method combining polarization and amplitudes of signals in communication system |
| CN103685133A (en) * | 2013-12-24 | 2014-03-26 | 北京邮电大学 | High-order continuous polarization modulation method of improving spectral efficiency |
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