Channel amplitude and phase correction method and system for a polarization synthesis device

Abstract

The present invention relates to the field of electromagnetic fields and microwave technologies, and specifically discloses a method and system for channel amplitude-phase correction of a polarization synthesis device. First, control the polarization synthesis device to operate in horizontal polarization or vertical polarization, and adjust the linearly polarized receiving antenna to also operate in the corresponding mode. Respectively measure the amplitude data under horizontal polarization and vertical polarization through a vector network analyzer. The calculation module calculates the amplitude correction data according to the amplitude data and the polarization synthesis requirements, and generates attenuation codes for the two polarization channels; then issue the attenuation codes to make the amplitude correction effective. On this basis, measure the phase data under horizontal polarization and vertical polarization based on the same process. The calculation module calculates the phase correction data according to the phase data and the polarization synthesis requirements; finally, control the phase shifter of the polarization synthesis device according to the phase correction data to achieve phase correction. The measured data shows that this method has a good amplitude-phase correction effect.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic fields and microwave technologies, and particularly to a method and system for channel amplitude-phase correction of a polarization synthesis device. Background Art

[0002] The polarization of an electromagnetic wave describes the variation of the direction of its electric field vector, and is usually represented by the trajectory traced by the end point of the electric field vector in space over time. If the trajectory is a straight line, it is called linear polarization; if the trajectory is a circle, it is called circular polarization. Linear polarization and circular polarization are often applied in fields such as radar, communication, and electronic countermeasures. At present, in the above fields, the control of polarization is often achieved by an antenna to implement a fixed single polarization, while a polarization synthesis device can synthesize polarization waves of any form according to requirements and can achieve polarization agility, so it has a wide range of application prospects. The common polarization synthesis principle is to achieve the synthesis of the required polarization based on the precise control of the amplitude and phase of two orthogonal polarization channels. However, due to unknown amplitude-phase errors introduced by the two orthogonal polarization channels, attenuation and phase shift control cannot be directly achieved through theoretical calculations. Summary of the Invention

[0003] The present invention provides a method and system for channel amplitude-phase correction of a polarization synthesis device, and the technical problem to be solved is: how to effectively perform amplitude-phase correction on two orthogonal polarization channels of a polarization synthesis device.

[0004] To solve the above technical problems, the present invention provides a method for channel amplitude-phase correction of a polarization synthesis device, including the steps of:

[0005] Install a linearly polarized receiving antenna in a darkroom under far-field conditions, and the linearly polarized receiving antenna and the orthogonal dual-polarized transmitting antenna of the polarization synthesis device are at the same horizontal height and have collinear radiation directions;

[0006] Remove the connection between the signal generation module and the power splitter of the polarization synthesis device, and connect a vector network analyzer between the input end of the power splitter and the linearly polarized receiving antenna;

[0007] Set the attenuation amount of the attenuator and the phase shift amount of the phase shifter of all channels of the polarization synthesis device to zero;

[0008] The vector network analyzer respectively obtains the amplitude data of the polarization synthesis device under horizontal and vertical polarizations through the linearly polarized receiving antenna;

[0009] Calculate amplitude correction data according to the amplitude data and the synthesized polarization requirements;

[0010] Control the attenuator of the polarization synthesis device according to the amplitude correction data;

[0011] The vector network analyzer respectively obtains the phase data of the polarization synthesis device under horizontal and vertical polarizations through the linearly polarized receiving antenna;

[0012] Calculate phase correction data according to the phase data and the synthetic polarization requirements;

[0013] Perform phase shift control on the phase shifter according to the phase correction data;

[0014] Disconnect the vector network analyzer from the power divider of the polarization synthesis device, re - establish the connection between the signal generation module and the power divider, and restore the state of the polarization synthesis device.

[0015] Further, obtain the amplitude data of the polarization synthesis device under horizontal and vertical polarizations respectively through the linear polarization receiving antenna, specifically including:

[0016] Control the polarization synthesis device to work in the horizontal polarization mode, rotate the linear polarization receiving antenna to the horizontal polarization, and measure the S21 amplitude data S21 at the corrected frequency point 水平 ;

[0017] Control the polarization synthesis device to work in the vertical polarization mode, rotate the linear polarization receiving antenna to the vertical polarization, and measure the S21 amplitude data S21 at the corrected frequency point 垂直 。

[0018] Further, calculate amplitude correction data according to the amplitude data and the synthetic polarization requirements, specifically:

[0019] According to the required polarization angle α and S21 in the synthetic polarization requirements 水平 、S21 垂直 Calculate the amplitude correction data △A = 20lg|tanα|-(S21 垂直 -S21 水平 ).

[0020] Further, control the attenuator of the polarization synthesis device according to the amplitude correction data, specifically:

[0021] Judge whether △A is positive. If it is, use |△A| as the attenuation amount of the horizontal polarization channel relative to the vertical polarization channel; otherwise, use |△A| as the attenuation amount of the vertical polarization channel relative to the horizontal polarization channel;

[0022] Convert the attenuation amount |△A| into the corresponding attenuation code value according to the attenuator dimension;

[0023] The attenuator of the polarization channel to be attenuated attenuates according to the attenuation code value.

[0024] Further, obtain the phase data of the polarization synthesis device under horizontal and vertical polarizations respectively through the linear polarization receiving antenna, specifically including:

[0025] Control the polarization synthesis device to operate in the horizontal polarization mode, rotate the linear polarization receiving antenna to the horizontal polarization, and measure the phase data Ph at the calibration frequency point. 水平 ;

[0026] Control the polarization synthesis device to operate in the vertical polarization mode, rotate the linear polarization receiving antenna to the vertical polarization, and measure the phase data Ph at the calibration frequency point. 垂直 。

[0027] Further, calculate the phase correction data according to the phase data and the synthetic polarization requirement, specifically:

[0028] If the synthetic polarization requirement is a linear polarization with 0 < α < 90°, the phase shift amount that the horizontal polarization channel needs to increase relative to the vertical polarization channel is ΔP = Ph 垂直 -Ph 水平 ;

[0029] If the synthetic polarization requirement is a linear polarization with 90° < α < 180°, the phase shift amount that the horizontal polarization channel needs to increase relative to the vertical polarization channel is ΔP = Ph 垂直 -Ph 水平 -180°;

[0030] If the synthetic polarization requirement is left-handed circular polarization, the phase shift amount that the horizontal polarization channel needs to increase relative to the vertical polarization channel is ΔP = -90° - Ph 水平 +Ph 垂直 ;

[0031] If the synthetic polarization requirement is right-handed circular polarization, the phase shift amount that the horizontal polarization channel needs to increase relative to the vertical polarization channel is ΔP = 90° - Ph 水平 +Ph 垂直 。

[0032] The present invention also provides a channel amplitude-phase correction system for a polarization synthesis device, which is characterized in that: it includes a polarization synthesis device, a calculation module, a vector network analyzer and a linear polarization receiving antenna connected in sequence, and the vector network analyzer is also connected to the power divider of the polarization synthesis device; the linear polarization receiving antenna can rotate 90° in the vertical plane of the connection line between the orthogonal dual-polarization transmitting antenna of the polarization synthesis device and the linear polarization receiving antenna, and the orthogonal dual-polarization transmitting antenna and the linear polarization receiving antenna are at the same horizontal height and the radiation directions are collinear;

[0033] The polarization synthesis device is used to set the attenuation amounts of the attenuators and the phase shift amounts of the phase shifters of all channels to zero;

[0034] The polarization synthesis device is also used to control the power divider so that the polarization synthesis device operates in horizontal polarization or vertical polarization;

[0035] The vector network analyzer is used to respectively obtain the amplitude data of the polarization synthesis device under horizontal and vertical polarizations through a linearly polarized receiving antenna;

[0036] The calculation module is used to calculate amplitude correction data according to the amplitude data and the synthetic polarization requirement;

[0037] The polarization synthesis device is further used to control the corresponding attenuator according to the amplitude correction data;

[0038] The vector network analyzer is further used to respectively obtain the phase data of the polarization synthesis device under horizontal and vertical polarizations through the linearly polarized receiving antenna;

[0039] The calculation module is further used to calculate phase correction data according to the phase data and the synthetic polarization requirement;

[0040] The polarization synthesis device is further used to control the corresponding phase shifter according to the phase correction data.

[0041] Preferably, the polarization synthesis device is used to control the power divider so that the polarization synthesis device operates in horizontal polarization or vertical polarization, and the vector network analyzer is used to respectively obtain the amplitude data of the polarization synthesis device under horizontal and vertical polarizations through the linearly polarized receiving antenna. Specifically:

[0042] The polarization synthesis device controls the power divider to turn on the horizontal polarization channel and turn off the vertical polarization channel, so that the polarization synthesis device operates in the horizontal polarization mode; rotates the linearly polarized receiving antenna to horizontal polarization; the vector network analyzer measures the S21 amplitude data S21 at the calibration frequency point 水平 ;

[0043] The polarization synthesis device controls the power divider to turn on the vertical polarization channel and turn off the horizontal polarization channel, so that the polarization synthesis device operates in the vertical polarization mode; rotates the linearly polarized receiving antenna to vertical polarization; the vector network analyzer measures the S21 amplitude data S21 at the calibration frequency point 垂直 ;

[0044] The polarization synthesis device is further used to control the power divider so that the polarization synthesis device operates in horizontal polarization or vertical polarization, and the vector network analyzer is further used to respectively obtain the phase data of the polarization synthesis device under horizontal and vertical polarizations through the linearly polarized receiving antenna. Specifically:

[0045] The polarization synthesis device controls the power divider to turn on the horizontal polarization channel and turn off the vertical polarization channel, so that the polarization synthesis device operates in the horizontal polarization mode; rotates the linear polarization receiving antenna to horizontal polarization; and the vector network analyzer measures the phase data Ph at the calibration frequency point. 水平 ;

[0046] The polarization synthesis device controls the power divider to turn on the vertical polarization channel and turn off the horizontal polarization channel, so that the polarization synthesis device operates in the vertical polarization mode; rotates the linear polarization receiving antenna to vertical polarization; and the vector network analyzer measures the phase data Ph at the calibration frequency point. 垂直 。

[0047] Preferably, the calculation module is further configured to calculate amplitude correction data according to the amplitude data and the synthetic polarization requirement. Specifically: the calculation module calculates the amplitude correction data ΔA = 20lg|tanα| - (S21 水平 、S21 垂直 ) according to the required polarization angle α and S21 in the synthetic polarization requirement. 垂直 -S21 水平 );

[0048] The polarization synthesis device is further configured to control the corresponding attenuator according to the amplitude correction data. Specifically:

[0049] The polarization synthesis device determines whether ΔA is positive. If so, it takes |ΔA| as the attenuation amount of the horizontal polarization channel relative to the vertical polarization channel; otherwise, it takes |ΔA| as the attenuation amount of the vertical polarization channel relative to the horizontal polarization channel.

[0050] Converts the attenuation amount |ΔA| into the corresponding attenuation code value according to the attenuator dimension.

[0051] The attenuator of the polarization channel to be attenuated attenuates according to the attenuation code value.

[0052] Preferably, the calculation module is configured to calculate phase correction data according to the phase data and the synthetic polarization requirement. Specifically:

[0053] If the synthetic polarization requirement is linear polarization with 0 < α < 90°, the phase shift amount required for the horizontal polarization channel relative to the vertical polarization channel is ΔP = Ph 垂直 -Ph 水平 ;

[0054] If the synthetic polarization requirement is linear polarization with 90° < α < 180°, the phase shift amount required for the horizontal polarization channel relative to the vertical polarization channel is ΔP = Ph 垂直 -Ph 水平 -180°;

[0055] If the synthetic polarization requirement is left - hand circular polarization, the additional phase shift amount that the horizontal polarization channel needs to increase relative to the vertical polarization channel is △P = - 90° - Ph 水平 + Ph 垂直 ;

[0056] If the synthetic polarization requirement is right - hand circular polarization, the additional phase shift amount that the horizontal polarization channel needs to increase relative to the vertical polarization channel is △P = 90° - Ph 水平 + Ph 垂直 。

[0057] A method and system for channel amplitude - phase correction of a polarization synthesis device provided by the present invention. For a polarization synthesis device composed of a power divider, an amplitude - phase control module, a power amplifier module, and an orthogonal dual - polarization transmitting antenna, the system introduces a linearly polarized receiving antenna, a vector network analyzer, and a calculation module to connect the entire radio frequency and space link in series. First, control the polarization synthesis device to work in horizontal polarization or vertical polarization, and adjust the linearly polarized receiving antenna to work in the corresponding mode. Measure the amplitude data under horizontal polarization and vertical polarization respectively through the vector network analyzer. The calculation module calculates the amplitude correction data according to the amplitude data and the synthetic polarization requirement, and generates attenuation codes for the two polarization channels; then send the attenuation codes to make the amplitude correction effective. On this basis, measure the phase data under horizontal polarization and vertical polarization through the same process, and the calculation module calculates the phase correction data according to the phase data and the synthetic polarization requirement; finally, control the phase shifter of the polarization synthesis device according to the phase correction data to achieve phase correction. The polarization synthesis device after amplitude - phase correction can synthesize the required polarization wave for the radio frequency signal of the correction frequency point. The measured data shows that the polarization isolation of the polarization synthesis device after amplitude - phase correction for synthesizing linear polarization can reach 30 dB, and the polarization isolation for synthesizing circular polarization can reach 20 dB, which is significantly better than that of traditional fixed - polarization antennas (usually the isolation degree < 15 dB). Brief Description of the Drawings

[0058] Figure 1 is a structural diagram of a polarization synthesis device provided by an embodiment of the present invention;

[0059] Figure 2 is a flowchart of a method for channel amplitude - phase correction of a polarization synthesis device provided by an embodiment of the present invention;

[0060] Figure 3 is a structural diagram of a channel amplitude - phase correction system of a polarization synthesis device provided by an embodiment of the present invention;

[0061] Figure 4 is a received amplitude diagram of 60° linear polarization at 6 GHz with different polarization angles provided by an embodiment of the present invention;

[0062] Figure 5It is the received amplitude diagram of circular polarization at different polarization angles in the 6 GHz band provided by the embodiments of the present invention. Detailed implementation manners

[0063] The following specifically clarifies the implementation manners of the present invention in conjunction with the accompanying drawings. The given embodiments are only for illustrative purposes and should not be construed as limiting the present invention. The included drawings are only for reference and illustration and do not constitute a limitation on the scope of patent protection of the present invention, because many changes can be made to the present invention without departing from its spirit and scope.

[0064] As Figure 1 shown, a typical polarization synthesis device consists of a signal generation module, a power divider, an amplitude-phase control module, a power amplifier module, and an orthogonal dual-polarization transmitting antenna. The signal generation module generates an excitation signal, which enters the two polarization channels of the amplitude-phase control module through the power divider respectively. The amplitude-phase control module includes a plurality of amplitude-phase control channels, and each amplitude-phase control channel includes a switch (to control the on and off of the channel), an attenuator (to attenuate the amplitude), and a phase shifter (to shift the phase). Each polarization channel can perform switch, attenuation, and phase shift control respectively. The signals of each channel are amplified by the corresponding linear power amplifier and then output to the corresponding polarization channel of the orthogonal dual-polarization transmitting antenna to synthesize the corresponding polarization wave in space. In this embodiment, channel 1 composed of switch 1, attenuator 1, phase shifter 1, and linear power amplifier 1 is the horizontal polarization channel, and channel 2 composed of switch 2, attenuator 2, phase shifter 2, and linear power amplifier 2 is the vertical polarization channel.

[0065] As Figure 2 shown in the flowchart of

[0066] Install a linearly polarized receiving antenna in a dark room under far-field conditions. The linearly polarized receiving antenna and the orthogonal dual-polarization transmitting antenna of the polarization synthesis device are at the same horizontal height and have collinear radiation directions.

[0067] Remove the RF connection cable between the signal generation module of the polarization synthesis device and the input end of the power divider, connect the Port1 port of the vector network analyzer to the input end of the power divider inside the polarization synthesis device, and connect the linearly polarized receiving antenna to the Port2 port of the vector network analyzer.

[0068] Set the attenuation amounts of the attenuators and the phase shift amounts of the phase shifters of all channels of the polarization synthesis device to zero.

[0069] The vector network analyzer respectively obtains the amplitude data of the polarization synthesis device under horizontal and vertical polarizations through the linearly polarized receiving antenna.

[0070] Calculate the amplitude correction data according to the amplitude data and the synthetic polarization requirements.

[0071] Control the attenuator of the polarization synthesis device according to the amplitude correction data;

[0072] The vector network analyzer respectively obtains the phase data of the polarization synthesis device under horizontal and vertical polarizations through the linear polarization receiving antenna;

[0073] Calculate the phase correction data according to the phase data and the synthetic polarization requirement;

[0074] Perform phase shift control on the phase shifter according to the phase correction data;

[0075] Remove the RF connection cable between the vector network analyzer and the power divider of the polarization synthesis device, reconnect the signal generation module to the input end of the power divider, and restore the state of the polarization synthesis device.

[0076] The amplitude and phase correction of the polarization synthesis device channel is carried out in a dark room under far-field conditions. The main purpose of selecting the far-field conditions of the dark room is to ensure the purity of the measurement environment and the stability of the electromagnetic wave propagation, so as to improve the accuracy and reliability of the correction.

[0077] Among them, the amplitude data of the polarization synthesis device under horizontal and vertical polarizations are respectively obtained through the linear polarization receiving antenna, specifically including:

[0078] Control the polarization synthesis device to work in the horizontal polarization mode, rotate the linear polarization receiving antenna to the horizontal polarization, and measure the S21 amplitude data S21 水平 (dB);

[0079] Control the polarization synthesis device to work in the vertical polarization mode, rotate the linear polarization receiving antenna to the vertical polarization, and measure the S21 amplitude data S21 垂直 (dB).

[0080] Among them, the amplitude correction data is calculated according to the amplitude data and the synthetic polarization requirement, specifically:

[0081] According to the required polarization angle α and S21 in the synthetic polarization requirement 水平 、S21 垂直 Calculate the amplitude correction data △A = 20lg|tanα|-(S21 垂直 -S21 水平 ).

[0082] Among them, controlling the attenuator of the polarization synthesis device according to the amplitude correction data is specifically:

[0083] Judge whether △A is positive. If it is, use |△A| as the attenuation amount of the horizontal polarization channel relative to the vertical polarization channel; otherwise, use |△A| as the attenuation amount of the vertical polarization channel relative to the horizontal polarization channel;

[0084] Convert the attenuation |△A| into the corresponding attenuation code value according to the attenuator dimension;

[0085] The attenuator of the polarization channel to be attenuated attenuates according to the attenuation code value.

[0086] Among them, the phase data of the polarization synthesis device under horizontal and vertical polarizations are respectively obtained through the linear polarization receiving antenna, specifically including:

[0087] Control the polarization synthesis device to work in the horizontal polarization mode, rotate the linear polarization receiving antenna to the horizontal polarization, and measure the phase data Ph 水平 (°);

[0088] Control the polarization synthesis device to work in the vertical polarization mode, rotate the linear polarization receiving antenna to the vertical polarization, and measure the phase data Ph 垂直 (°).

[0089] Among them, the phase correction data is calculated according to the phase data and the synthetic polarization requirement, specifically:

[0090] If the synthetic polarization requirement is linear polarization with 0 < α < 90°, the phase shift amount △P that the horizontal polarization channel needs to increase relative to the vertical polarization channel is △P = Ph 垂直 -Ph 水平 ;

[0091] If the synthetic polarization requirement is linear polarization with 90° < α < 180°, the phase shift amount △P that the horizontal polarization channel needs to increase relative to the vertical polarization channel is △P = Ph 垂直 -Ph 水平 -180°;

[0092] If the synthetic polarization requirement is left-handed circular polarization, the phase shift amount △P that the horizontal polarization channel needs to increase relative to the vertical polarization channel is △P = -90° - Ph 水平 +Ph 垂直 ;

[0093] If the synthetic polarization requirement is right-handed circular polarization, the phase shift amount △P that the horizontal polarization channel needs to increase relative to the vertical polarization channel is △P = 90° - Ph 水平 +Ph 垂直 .

[0094] After completing the channel amplitude-phase correction under the corresponding frequency points and polarization conditions according to the above steps, by controlling the conduction of switches 1 and 2, and controlling the corresponding attenuator and phase shifter according to the corrected attenuation and phase shift data, the required polarization wave can be synthesized when the corresponding radio frequency signal is generated in the control signal generation module.

[0095] It should be understood that various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in the present invention can be executed in parallel, sequentially, or in different orders, as long as the desired results of the technical solution of the present invention can be achieved. This embodiment does not limit this here.

[0096] Corresponding to the channel amplitude-phase correction method of the above polarization synthesis device, an embodiment of the present invention also provides a channel amplitude-phase correction system for a polarization synthesis device. As Figure 3 shown in the structural diagram, the system includes a polarization synthesis device, a calculation module, a vector network analyzer, and a linearly polarized receiving antenna connected in sequence. The vector network analyzer is also connected to the power divider of the polarization synthesis device. The linearly polarized receiving antenna can rotate 90° in the plane perpendicular to the connection line between the orthogonal dual-polarized transmitting antenna and the linearly polarized receiving antenna of the polarization synthesis device. The orthogonal dual-polarized transmitting antenna and the linearly polarized receiving antenna are at the same horizontal height and have collinear radiation directions.

[0097] The polarization synthesis device is used to set the attenuation amounts of the attenuators and the phase shifts of the phase shifters of all channels to zero;

[0098] The polarization synthesis device is also used to control the power divider so that the polarization synthesis device operates in horizontal polarization or vertical polarization;

[0099] The vector network analyzer is used to respectively obtain the amplitude data of the polarization synthesis device in horizontal and vertical polarizations through the linearly polarized receiving antenna;

[0100] The calculation module is used to calculate amplitude correction data according to the amplitude data and the composite polarization requirements;

[0101] The polarization synthesis device is also used to control the corresponding attenuators according to the amplitude correction data;

[0102] The vector network analyzer is also used to respectively obtain the phase data of the polarization synthesis device in horizontal and vertical polarizations through the linearly polarized receiving antenna;

[0103] The calculation module is also used to calculate phase correction data according to the phase data and the composite polarization requirements;

[0104] The polarization synthesis device is also used to control the corresponding phase shifters according to the phase correction data.

[0105] The polarization synthesis device is used to control the power divider so that the polarization synthesis device operates in horizontal polarization or vertical polarization, and the vector network analyzer is used to respectively obtain the amplitude data of the polarization synthesis device in horizontal and vertical polarizations through the linearly polarized receiving antenna. Specifically:

[0106] The polarization synthesis device makes the polarization synthesis device operate in the horizontal polarization mode by controlling the power divider to turn on the horizontal polarization channel and turn off the vertical polarization channel; rotates the linearly polarized receiving antenna to the horizontal polarization (manually or using an automated drive module); and the vector network analyzer measures the S21 amplitude data S21 at the calibration frequency point 水平 (dB);

[0107] The polarization synthesis device makes the polarization synthesis device operate in the vertical polarization mode by controlling the power divider to turn on the vertical polarization channel and turn off the horizontal polarization channel; rotates the linearly polarized receiving antenna to the vertical polarization (manually or using an automated drive module); and the vector network analyzer measures the S21 amplitude data S21 at the calibration frequency point 垂直 (dB).

[0108] The polarization synthesis device is also used to make the polarization synthesis device operate in horizontal or vertical polarization by controlling the power divider, and the vector network analyzer is also used to obtain the phase data of the polarization synthesis device in horizontal and vertical polarizations through the linearly polarized receiving antenna, specifically:

[0109] The polarization synthesis device makes the polarization synthesis device operate in the horizontal polarization mode by controlling the power divider to turn on the horizontal polarization channel and turn off the vertical polarization channel; rotates the linearly polarized receiving antenna to the horizontal polarization (manually or using an automated drive module); and the vector network analyzer measures the phase data Ph at the calibration frequency point 水平 (°);

[0110] The polarization synthesis device makes the polarization synthesis device operate in the vertical polarization mode by controlling the power divider to turn on the vertical polarization channel and turn off the horizontal polarization channel; rotates the linearly polarized receiving antenna to the vertical polarization (manually or using an automated drive module); and the vector network analyzer measures the phase data Ph at the calibration frequency point 垂直 (°).

[0111] The calculation module is also used to calculate the amplitude correction data according to the amplitude data and the synthetic polarization requirement, specifically: the calculation module calculates the amplitude correction data △A = 20lg|tanα| - (S21 水平 、S21 垂直 according to the required polarization angle α and S21 in the synthetic polarization requirement 垂直 - S21 水平 );

[0112] The polarization synthesis device is also used to control the corresponding attenuator according to the amplitude correction data, specifically:

[0113] The polarization synthesis device determines whether △A is positive. If it is, |△A| is taken as the attenuation amount of the horizontal polarization channel relative to the vertical polarization channel; otherwise, |△A| is taken as the attenuation amount of the vertical polarization channel relative to the horizontal polarization channel.

[0114] The attenuation amount |△A| is converted into the corresponding attenuation code value according to the dimension of the attenuator.

[0115] The attenuator of the polarization channel that needs to be attenuated attenuates according to the attenuation code value.

[0116] The calculation module is used to calculate the phase correction data according to the phase data and the synthetic polarization requirement. Specifically:

[0117] If the synthetic polarization requirement is linear polarization with 0 < α < 90°, the phase shift amount △P that the horizontal polarization channel needs to increase relative to the vertical polarization channel is △P = Ph 垂直 -Ph 水平 ;

[0118] If the synthetic polarization requirement is linear polarization with 90° < α < 180°, the phase shift amount △P that the horizontal polarization channel needs to increase relative to the vertical polarization channel is △P = Ph 垂直 -Ph 水平 -180°;

[0119] If the synthetic polarization requirement is left-handed circular polarization, the phase shift amount △P that the horizontal polarization channel needs to increase relative to the vertical polarization channel is △P = -90° - Ph 水平 +Ph 垂直 ;

[0120] If the synthetic polarization requirement is right-handed circular polarization, the phase shift amount △P that the horizontal polarization channel needs to increase relative to the vertical polarization channel is △P = 90° - Ph 水平 +Ph 垂直 。

[0121] A method and system for channel amplitude-phase correction of a polarization synthesis device provided by an embodiment of the present invention. The system introduces a linearly polarized receiving antenna, a vector network analyzer, and a calculation module to connect the entire radio frequency and space link in series. First, control the polarization synthesis device to work in horizontal polarization or vertical polarization, and adjust the linearly polarized receiving antenna to work in the corresponding mode. Measure the amplitude data under horizontal polarization and vertical polarization respectively through the vector network analyzer. The calculation module calculates the amplitude correction data according to the amplitude data and the synthetic polarization requirement, and generates attenuation codes for the two polarization channels. Then, send the attenuation codes to make the amplitude correction effective. On this basis, measure the phase data under horizontal polarization and vertical polarization through the same process. The calculation module calculates the phase correction data according to the phase data and the synthetic polarization requirement. Finally, control the phase shifter of the polarization synthesis device according to the phase correction data to achieve phase correction. The present invention has a good amplitude-phase correction effect. After amplitude-phase correction, the polarization synthesis device can synthesize the required polarization wave for the radio frequency signal at the corrected frequency point.

[0122] The implementation effect of the present invention is verified through experiments below.

[0123] Example 1: Channel amplitude-phase correction is performed for a 60° linear polarization at a frequency of 6 GHz.

[0124] First, build a calibration environment according to Figure 3 ; after setting the attenuator and phase shifter to zero, obtain the S21 amplitude data S21 of the polarization synthesis device under horizontal and vertical polarizations respectively 水平 and S21 垂直 ; then calculate the amplitude correction data: 20lg|tan60°|-(S21 垂直 -S21 水平 ), and convert the corrected amplitude data into an attenuation code value and control the corresponding attenuator to make the attenuation code value effective; then obtain the phase data Ph 水平 and Ph 垂直 of the polarization synthesis device under horizontal and vertical polarizations respectively, and calculate the additional phase shift amount required for channel 1 relative to channel 2 (Ph 垂直 -Ph 水平 ); finally, restore the device state, control switches 1 and 2 to work in the conducting state, control the corresponding phase shifter and attenuator according to the above correction data, and then control the signal generation module to generate a 6 GHz radio frequency signal, and a 60° linear polarization wave can be synthesized. The measured data is as Figure 4 shown. By comparing the amplitude data at 60°, -30°, and 150°, it can be seen that the polarization isolation is better than 30 dB.

[0125] Example 2: Channel amplitude-phase correction is performed for a left-handed circular polarization at a frequency of 6 GHz.

[0126] The implementation process refers to Implementation Example 1, with the difference that when calculating the amplitude correction data, α is taken as 45°, and the phase shift amount that Channel 1 needs to increase relative to Channel 2 is (-90° - Ph 水平 + Ph 垂直 ). The measured value shows that when using a left-handed circularly polarized antenna for reception, the received amplitude is -20 dB, when using a right-handed circularly polarized antenna for reception, the received amplitude is -42 dB, and the isolation degree is 22 dB. When using a linearly polarized antenna for reception verification, the received amplitude consistency can reach 1 dB at different polarization angles. The measured data are as Figure 5 shown.

[0127] The measured data of Example 1 and Example 2 show that the polarization isolation of the polarization synthesis device after amplitude-phase correction can reach 30 dB for linearly polarized synthesis and 20 dB for circularly polarized synthesis, which is significantly better than that of traditional fixed polarization antennas (usually the isolation degree < 15 dB).

[0128] The above embodiments are the preferred embodiments of the present invention, but the implementation manners of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement manners and are all included in the protection scope of the present invention.

Claims

1. A method for channel amplitude and phase correction of a polarization synthesis device, characterized in that Including the steps: Install a linearly polarized receiving antenna in a dark room under far-field conditions. The linearly polarized receiving antenna and the orthogonal dual-polarized transmitting antenna of the polarization synthesis device are at the same horizontal height and have collinear radiation directions. The polarization synthesis device is composed of a signal generation module, a power divider, an amplitude-phase control module, a power amplifier module, and an orthogonal dual-polarized transmitting antenna connected in sequence. The amplitude-phase control module includes multiple amplitude-phase control channels. Each amplitude-phase control channel includes a switch, an attenuator, and a phase shifter. The signals of each channel are amplified by the corresponding linear power amplifier and then output to the corresponding polarization channel of the orthogonal dual-polarized transmitting antenna to synthesize the corresponding polarization wave in space. Remove the connection between the signal generation module and the power divider of the polarization synthesis device, and connect the vector network analyzer between the input end of the power divider and the linearly polarized receiving antenna. Set the attenuation amounts of the attenuators and the phase shift amounts of the phase shifters of all channels of the polarization synthesis device to zero. The vector network analyzer respectively obtains the amplitude data of the polarization synthesis device under horizontal and vertical polarizations through the linearly polarized receiving antenna. Calculate the amplitude correction data according to the amplitude data and the synthetic polarization requirement. Control the attenuator of the polarization synthesis device according to the amplitude correction data. The vector network analyzer respectively obtains the phase data of the polarization synthesis device under horizontal and vertical polarizations through the linearly polarized receiving antenna. Calculate the phase correction data according to the phase data and the synthetic polarization requirement. Perform phase shift control on the phase shifter according to the phase correction data. Remove the connection between the vector network analyzer and the power divider of the polarization synthesis device, re-establish the connection between the signal generation module and the power divider, and restore the state of the polarization synthesis device.

2. The channel amplitude and phase calibration method of a polarization synthesis device according to claim 1, characterized in that, Respectively obtain the amplitude data of the polarization synthesis device under horizontal and vertical polarizations through the linearly polarized receiving antenna, specifically including: Control the polarization synthesis device to operate in the horizontal polarization mode, rotate the linearly polarized receiving antenna to horizontal polarization, and measure the S21 amplitude data S21 at the calibration frequency point 水平 ; Control the polarization synthesis device to operate in the vertical polarization mode, rotate the linearly polarized receiving antenna to the vertical polarization, and measure the S21 amplitude data S21 at the calibration frequency point 垂直 。 3. The channel amplitude and phase correction method of a polarization synthesis device according to claim 2, characterized in that, Calculate the amplitude correction data according to the amplitude data and the synthetic polarization requirement, specifically: According to the required polarization angle α and S21 in the synthetic polarization requirements 水平 , S21 垂直 The amplitude correction data △A = 20lg|tanα| - (S21 垂直 - S21 水平 ) is calculated.

4. A method for channel amplitude and phase correction of a polarization synthesis device according to claim 3, characterized in that, Control the attenuator of the polarization synthesis device according to the amplitude correction data, specifically: Judge whether △A is positive. If so, take |△A| as the attenuation amount of the horizontal polarization channel relative to the vertical polarization channel; otherwise, take |△A| as the attenuation amount of the vertical polarization channel relative to the horizontal polarization channel. Convert the attenuation amount |△A| into the corresponding attenuation code value according to the attenuator dimension. The attenuator of the polarization channel to be attenuated attenuates according to the attenuation code value.

5. A method for channel amplitude and phase correction of a polarization synthesis device according to claim 4, characterized in that Respectively obtain the phase data of the polarization synthesis device under horizontal and vertical polarizations through the linearly polarized receiving antenna, specifically including: Control the polarization synthesis device to work in the horizontal polarization mode, rotate the linearly polarized receiving antenna to the horizontal polarization, and measure the phase data Ph at the calibration frequency point 水平 ; Control the polarization synthesis device to work in the vertical polarization mode, rotate the linearly polarized receiving antenna to the vertical polarization, and measure the phase data Ph at the calibration frequency point 垂直 .

6. The channel amplitude and phase correction method of a polarization synthesis device according to claim 5, characterized in that Calculate the phase correction data according to the phase data and the synthetic polarization requirement, specifically: If the synthetic polarization requirement is a linear polarization with 0 < α < 90°, the additional phase shift required for the horizontal polarization channel relative to the vertical polarization channel is ΔP = Ph 垂直 −Ph 水平 ; If the synthetic polarization requirement is a linear polarization with 90° < α < 180°, the additional phase shift required for the horizontal polarization channel relative to the vertical polarization channel is ΔP = Ph 垂直 - Ph 水平 - 180°; If the synthetic polarization requirement is left-handed circular polarization, the additional phase shift required for the horizontal polarization channel relative to the vertical polarization channel is △P = -90° - Ph 水平 + Ph 垂直 ; If the synthetic polarization requirement is right-handed circular polarization, the phase shift amount that needs to be increased in the horizontal polarization channel relative to the vertical polarization channel is △P = 90° - Ph 水平 + Ph 垂直 .

7. A channel amplitude and phase correction system for a polarization synthesis device, characterized in that: It includes a polarization synthesis device, a calculation module, a vector network analyzer, and a linearly polarized receiving antenna connected in sequence. The vector network analyzer is also connected to the power splitter of the polarization synthesis device; the linearly polarized receiving antenna can rotate 90° within the vertical plane of the connection line between the orthogonal dual-polarized transmitting antenna of the polarization synthesis device and the linearly polarized receiving antenna. The orthogonal dual-polarized transmitting antenna and the linearly polarized receiving antenna are at the same horizontal height and have collinear radiation directions; the polarization synthesis device is composed of a signal generation module, a power splitter, an amplitude-phase control module, a power amplifier module, and an orthogonal dual-polarized transmitting antenna connected in sequence. The amplitude-phase control module includes multiple amplitude-phase control channels. Each amplitude-phase control channel includes a switch, an attenuator, and a phase shifter. The signals of each channel are amplified by the corresponding linear power amplifier and then output to the corresponding polarization channel of the orthogonal dual-polarized transmitting antenna to synthesize the corresponding polarization wave in space; The polarization synthesis device is used to set the attenuation amount of the attenuator and the phase shift amount of the phase shifter of all channels to zero; The polarization synthesis device is also used to control the power splitter so that the polarization synthesis device operates in horizontal polarization or vertical polarization; The vector network analyzer is used to respectively obtain the amplitude data of the polarization synthesis device in horizontal and vertical polarizations through the linearly polarized receiving antenna; The calculation module is used to calculate the amplitude correction data according to the amplitude data and the synthetic polarization requirements; The polarization synthesis device is also used to control the corresponding attenuator according to the amplitude correction data; The vector network analyzer is also used to respectively obtain the phase data of the polarization synthesis device in horizontal and vertical polarizations through the linearly polarized receiving antenna; The calculation module is also used to calculate the phase correction data according to the phase data and the synthetic polarization requirements; The polarization synthesis device is also used to control the corresponding phase shifter according to the phase correction data; 8. The channel amplitude and phase correction system of a polarization synthesis device according to claim 7, characterized in that The polarization synthesis device is used to control the power splitter so that the polarization synthesis device operates in horizontal polarization or vertical polarization, and the vector network analyzer is used to respectively obtain the amplitude data of the polarization synthesis device in horizontal and vertical polarizations through the linearly polarized receiving antenna. Specifically: The polarization synthesis device controls the power divider to turn on the horizontal polarization channel and turn off the vertical polarization channel, so that the polarization synthesis device operates in the horizontal polarization mode; rotates the linearly polarized receiving antenna to the horizontal polarization; and the vector network analyzer measures the S21 amplitude data S21 at the calibration frequency point 水平 ; The polarization synthesis device controls the power divider to turn on the vertical polarization channel and turn off the horizontal polarization channel, so that the polarization synthesis device operates in the vertical polarization mode; rotates the linear polarization receiving antenna to vertical polarization; and the vector network analyzer measures the S21 amplitude data S21 at the calibration frequency point 垂直 ; The polarization synthesis device is also used to control the power splitter so that the polarization synthesis device operates in horizontal polarization or vertical polarization, and the vector network analyzer is also used to respectively obtain the phase data of the polarization synthesis device in horizontal and vertical polarizations through the linearly polarized receiving antenna. Specifically: The polarization synthesis device controls the power divider to turn on the horizontal polarization channel and turn off the vertical polarization channel, so that the polarization synthesis device operates in the horizontal polarization mode; rotates the linearly polarized receiving antenna to the horizontal polarization; and the vector network analyzer measures the phase data Ph at the calibration frequency point 水平 ; The polarization synthesis device enables the polarization synthesis device to operate in the vertical polarization mode by controlling the power divider to turn on the vertical polarization channel and turn off the horizontal polarization channel; rotates the linearly polarized receiving antenna to the vertical polarization; and the vector network analyzer measures the phase data Ph at the calibration frequency point 垂直 .

9. A channel amplitude-phase correction system for a polarization synthesis device according to claim 8, characterized in that: The calculation module is further configured to calculate amplitude correction data according to the amplitude data and the synthetic polarization requirement, specifically: the calculation module calculates the amplitude correction data ΔA = 20lg|tanα|−(S21 水平 , S21 垂直 based on the required polarization angle α and S21 in the synthetic polarization requirement 垂直 −S21 水平 ); The polarization synthesis device is also used to control the corresponding attenuator according to the amplitude correction data. Specifically: The polarization synthesis device judges whether △A is positive. If so, |△A| is used as the attenuation amount of the horizontal polarization channel relative to the vertical polarization channel. Otherwise, |△A| is used as the attenuation amount of the vertical polarization channel relative to the horizontal polarization channel; The attenuation amount |△A| is converted into the corresponding attenuation code value according to the attenuator dimension; The attenuator of the polarization channel that needs to be attenuated attenuates according to the attenuation code value; 10. The channel amplitude and phase correction system of a polarization synthesis device according to claim 9, characterized in that, The calculation module is used to calculate the phase correction data according to the phase data and the synthetic polarization requirements. Specifically: If the synthetic polarization requirement is a linear polarization with 0 < α < 90°, the additional phase shift required for the horizontal polarization channel relative to the vertical polarization channel is ΔP = Ph 垂直 −Ph 水平 ; If the synthetic polarization requirement is a linear polarization with 90° < α < 180°, the additional phase shift required for the horizontal polarization channel relative to the vertical polarization channel is ΔP = Ph 垂直 −Ph 水平 −180°; If the synthetic polarization requirement is left-handed circular polarization, the phase shift amount that needs to be increased in the horizontal polarization channel relative to the vertical polarization channel is △P = -90° - Ph 水平 + Ph 垂直 ; If the synthetic polarization requirement is right-handed circular polarization, the additional phase shift required for the horizontal polarization channel relative to the vertical polarization channel is ΔP = 90° - Ph 水平 + Ph 垂直 .

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