Communication-in-moving antenna linear polarization control method

Abstract

The invention discloses a communication-in-moving antenna linear polarization control method, and belongs to the technical field of communication. According to the method, a polarization axis angle is correspondingly defined and a polarization initial preset strategy is set according to different polarization structure forms, a polarization geographic angle is updated according to a real-time position in a carrier advancing process, and coordinate rotation is performed by using carrier attitude information to isolate the directional influence of attitude change on polarization; a polarization unwinding threshold value is preset according to the motion characteristics of the carrier platform, the polarization unwinding opportunity is decided in combination with the rotation range, polarization tracking is achieved, and meanwhile communication interruption caused by polarization limiting can be avoided as much as possible.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and specifically to a method for controlling the polarization of a mobile antenna. Background Technology

[0002] Satellite communication uses artificial Earth satellites as relay stations to transmit information between multiple radio communication stations. It offers advantages such as wide coverage, immunity to ground-based disasters, and high flexibility. In particular, satellite mobile communication stations can provide continuous communication capabilities for moving targets (ships, aircraft, vehicles). Mobile communication antennas, as front-end equipment in mobile satellite communication, achieve automatic satellite tracking by adjusting the azimuth, elevation, and polarization of their transmit and receive beams. Linear polarization, the polarization form used in primary satellite communication methods such as Ku and C, directly affects signal reception efficiency, interference suppression, and system capacity. Therefore, researching and optimizing the linear polarization control technology of mobile communication antennas is of great significance for improving the overall performance of satellite communication systems.

[0003] To achieve polarization coverage of -90° to 90°, the polarization adjustment range of a mobile communication antenna must be no less than 180°. Based on this, there are currently two main structural forms for antenna polarization: one allows for continuous 360° rotation, while the other, limited by structural installation and performance requirements, can only rotate freely within a limited range (≥180°). During the movement of a mobile communication platform (ship, aircraft, vehicle), the antenna needs to adjust its polarization angle in real time based on the position and attitude information of the moving platform. The main problems encountered are as follows:

[0004] (1) The polarization angle is defined in the range of -90° to 90° (-90° and 90° coincide), and the rotation angle of the antenna polarization mechanical structure is defined in the range of 0° to 360°. There is a problem that the polarization angle and the rotation angle of the mechanical structure are inconsistent during the polarization control process.

[0005] (2) For structures whose polarization can only rotate freely within a limited range (≥180°), there may be two mechanical positions corresponding to a certain polarization angle between -90° and 90°, resulting in an optimal position selection problem.

[0006] (3) Changes in the real-time position and attitude of the carrier during its movement will cause changes in the polarization angle of the on-the-go antenna to the star. For structures where the polarization can only rotate freely within a limited range (≥180°), there is a problem of polarization matching failure due to polarization limitation. Summary of the Invention

[0007] In view of this, the present invention proposes a polarization control method for mobile communication antennas. This method achieves polarization tracking while minimizing communication interruptions caused by polarization limitations by presetting the initial polarization angle, updating the polarization geographic angle based on the real-time position during the carrier's movement, and isolating the carrier's attitude through coordinate rotation.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] A method for polarization control of a mobile antenna includes the following steps:

[0010] Step 1: Initially preset the antenna polarization based on the polarization structure and the polarization relative to the star's geographical angle;

[0011] Step 2: Update the polarization of the mobile communication antenna to the satellite's geographic angle based on the carrier's real-time location;

[0012] Step 3: Calculate the target axis angle of polarization based on the geographical angle of the star and the carrier attitude information;

[0013] Step 4: Determine the control strategy based on the polarization structure and drive the antenna polarization to rotate into position.

[0014] Furthermore, the specific method of step 1 is as follows:

[0015] (101) The polarization axis angle P is affected by different polarization structure forms. j Define it as follows:

[0016] When the polarization structure can rotate continuously for 360°, the polarization axis angle P is defined. j Consistent with the polarization angle, i.e. -90° to 90°, where -90° and 90° coincide, and each rotation of the polarization structure corresponds to two polarization cycles;

[0017] When the polarization structure can only rotate freely within a range of ≥180°, the polarization axis angle P is defined according to the actual rotation range within the range of -180° to 180°. j ;

[0018] (102) Calculate the geocentric angle P of the on-the-go antenna polarization based on satellite information and carrier location information. d :

[0019]

[0020] In the formula, λ0 is the satellite longitude, λ is the carrier longitude, and φ is the carrier latitude;

[0021] (103) Initially preset the polarization for different polarization structure forms:

[0022] When the polarization structure can rotate continuously by 360°, the initial position of the polarization is preset to the angle closest to the current polarization position based on the polarization's geographic angle to the star. The specific method is as follows:

[0023] 1) Calculate the polarization relative to the geographic angle P of the star. d and polarization axis angle P j The angle difference Δ is updated to Δ-180° when Δ is greater than 90° and to Δ+180° when Δ is less than -90°.

[0024] 2) The sign of the Δ value determines the direction of polarization rotation: When the sign of the Δ value is positive, the polarization axis angle is preset to P in a clockwise direction. d When the Δ value is negative, the polarization axis angle is reversed and preset to P. d ;

[0025] When the polarization mechanism can rotate freely only within a range of ≥180°, the initial polarization position is preset to the position farthest from the polarization limit based on the polarization geographic angle to the star. The specific method is as follows:

[0026] 1) Determine the polarization design margin P based on the polarization rotation range. th :

[0027] P th = (P CW -P CCW -180) / 2

[0028] In the formula, P CW P is the polarization finite angle value. CCW This is the polarization inverse limit angle value;

[0029] 2) If P d Greater than P CW - P th Then the polarization axis angle will be preset to P. d -180; otherwise, if P d Less than P CCW + P th Then the polarization axis angle will be preset to P. d +180; otherwise, preset the polarization axis angle to P. d .

[0030] Furthermore, the specific method for step 3 is as follows:

[0031] According to the polarization of the on-the-fly antenna and the geographical angle P of the star d In addition to the tilt and pitch of the carrier, the target axis angle P of polarization is calculated. jm :

[0032]

[0033] In the formula, A j E is the azimuth axis angle of the antenna. j R is the elevation axis angle of the antenna, P is the pitch angle of the carrier, and R is the roll angle of the carrier.

[0034] Furthermore, step 4 is specifically implemented as follows:

[0035] (401) Determine the control strategy for different polarization structures:

[0036] When the polarization mechanism can rotate continuously for 360°, execute (403) directly; otherwise, preset the polarization dewinding threshold R according to the motion characteristics of the carrier platform. Th :

[0037] For vehicles, R Th The value range is 8° to 10°.

[0038] For ships, R Th The value range is 20° to 30°.

[0039] For airplanes, R Th The value range is 30° to 35°;

[0040] (402) Based on the polarization of the star's geographic angle P d and polarization around the threshold R Th The decision is whether to rotate 180° in the opposite direction to unwind:

[0041] a) When the polarization is close to the limit position and the carrier is horizontal, when the polarization angle is less than R from the limit angle. Th At that time, the polarization target axis angle P will be... jm The value is updated to P jm -180°;

[0042] b) When the polarization is close to the inverse limit and the carrier is horizontal, when the polarization angle is less than R from the inverse limit angle. Th At that time, the polarization target axis angle P will be... jm The value is updated to P jm +180°;

[0043] (403) Drive the antenna to polarize to the target axis angle P jm .

[0044] The beneficial effects of adopting the above technical solution are as follows:

[0045] 1. This invention defines mechanical angles for different polarization structure forms to ensure the continuity of angles during polarization tracking.

[0046] 2. This invention ensures that the polarization angle is initially preset and the optimal initial position is selected, thus ensuring that the polarization tracking process is not limited for a long time.

[0047] 3. The present invention presets the polarization unwinding threshold based on the motion characteristics of the carrier platform (ship, aircraft, vehicle), and rationally plans the timing of releasing the limit alarm to minimize communication interruption caused by polarization unwinding.

[0048] 4. This invention can be used in the early stages of designing mobile antennas to guide the design of polarization rotation range based on the motion characteristics of different carrier platforms (ships, aircraft, vehicles). Attached Figure Description

[0049] Figure 1 This is a schematic diagram illustrating the definition of the polarization axis angle when the polarization mechanism can rotate continuously by 360° in an embodiment of the present invention;

[0050] Figure 2 This is a schematic diagram illustrating the definition of the polarization axis angle when the polarization mechanism in this embodiment of the invention can only rotate freely within a limited range (≥180°);

[0051] Figure 3 This is a polarization control flowchart in an embodiment of the present invention. Detailed Implementation

[0052] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0053] A method for controlling the polarization of a mobile antenna, such as Figure 3 As shown, it includes the following steps:

[0054] (1) The antenna polarization is initially preset according to the polarization structure and the polarization relative to the star's geographic angle; the specific method is as follows:

[0055] (101) The polarization axis angle P is affected by different polarization structure forms. j Define it as follows:

[0056] When the polarization structure can rotate continuously for 360°, the polarization axis angle P is defined. j Consistent with the polarization angle, i.e. -90° to 90° (-90° and 90° coincide), each rotation of the polarization structure corresponds to two polarization cycles, such as... Figure 1 As shown.

[0057] When the polarization structure can only rotate freely within a limited range (≥180°), the polarization axis angle P is defined according to the actual rotation range within the range of -180° to 180°. j ,like Figure 2 As shown.

[0058] (102) Calculate the geocentric angle P of the on-the-go antenna polarization based on satellite information and carrier location information. d :

[0059]

[0060] In the formula, λ0 is the satellite longitude, λ is the carrier longitude, and φ is the carrier latitude.

[0061] (103) Initially preset the polarization for different polarization structure forms:

[0062] (1031) When the polarization structure can rotate continuously by 360°, the initial position of the polarization is preset to the angle closest to the current polarization position based on the polarization-to-star geographic angle, as follows:

[0063] 1) The astropolarized geographic angle P d and polarization axis angle P j The angle difference Δ is normalized to [-90°, 90°): when the Δ value is greater than 90°, the Δ value is updated to (Δ-180°); when the Δ value is less than -90°, the Δ value is updated to (Δ+180°).

[0064] 2) Based on the stellar polarization geographic angle P d and polarization axis angle P j The sign of the angle difference Δ determines the direction of polarization rotation: when the sign of Δ is positive, the polarization axis angle is preset to P in a clockwise direction. d When the Δ value is negative, the polarization axis angle is reversed and preset to P. d ;

[0065] (1032) When the polarization mechanism can only rotate freely within a limited range (≥180°), the initial polarization position is preset to the position farthest from the polarization limit based on the polarization-to-star geographic angle, as follows:

[0066] 1) Determine the polarization design margin P based on the polarization rotation range. th :

[0067] P th = (P CW -P CCW -180) / 2

[0068] In the formula, P CW P is the polarization finite angle value. CCW This is the polarization inverse limit angle value.

[0069] 2) If P d Greater than (P) CW - P th Then the polarization axis angle will be preset to (P). d -180); otherwise, if P d Less than (P) CCW +P th), preset the polarization axis angle to (P d +180); otherwise, preset the polarization axis angle to P. d .

[0070] (2) Update the geo-angle of the polarization of the mobile antenna to the satellite according to the real-time location of the carrier, that is, recalculate the geo-angle P of the polarization of the mobile antenna to the satellite according to formula (1). d ;

[0071] (3) Calculate the target axis angle of polarization based on the carrier attitude information to isolate the influence of carrier motion on polarization direction; the specific method is as follows:

[0072] According to the polarization of the on-the-fly antenna and the geographical angle P of the satellite... d In addition to the tilt and pitch of the carrier, the target axis angle P of polarization is calculated. jm :

[0073]

[0074] In the formula, A j E is the azimuth axis angle of the antenna. j R is the elevation axis angle of the antenna, P is the pitch angle of the carrier, and R is the roll angle of the carrier.

[0075] (4) Based on the polarization structure, determine the control strategy to drive the antenna polarization rotation to the correct position; the specific method is as follows:

[0076] (401) For different polarization structure forms, determine the control strategy. When the polarization mechanism can rotate continuously in 360°, execute (403); otherwise, preset the polarization unwinding threshold R according to the motion characteristics of the carrier platform (ship, aircraft, vehicle). Th :

[0077] For vehicles, R Th The value range is 8° to 10°.

[0078] For ships, R Th The value range is 20° to 30°.

[0079] For airplanes, R Th The value range is 30° to 35°;

[0080] (402) According to P d and R Th The decision is whether to mechanically rotate 180° in the opposite direction to unwind.

[0081] a) When the polarization is close to the limit position and the carrier (ship, aircraft, vehicle) is horizontal, the polarization angle is less than R from the limit angle. Th At that time, the polarization target axis angle P will be... jmThe value is updated to (P) jm -180°).

[0082] b) When the polarization is close to the inverse limit and the carrier (ship, aircraft, vehicle) is horizontal, the polarization angle is less than R from the inverse limit angle. Th At that time, the polarization target axis angle P will be... jm The value is updated to (P) jm +180°).

[0083] (403) Drive the antenna to polarize to the target axis angle P jm .

[0084] In summary, this invention defines the polarization axis angle for different polarization structure forms and sets an initial polarization preset strategy. During the carrier's movement, the polarization geographic angle is updated according to the real-time position, and the carrier's attitude information is used to perform coordinate rotation to isolate the influence of attitude changes on the polarization direction. The polarization de-winding threshold is preset according to the motion characteristics of the carrier platform, and the polarization de-winding timing is determined by combining the rotation range, thereby achieving polarization tracking. At the same time, it can minimize communication interruptions caused by polarization limitations.

[0085] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for controlling the polarization of a moving-mode antenna, characterized in that, Includes the following steps: Step 1: Initially preset the antenna polarization based on the polarization structure and the polarization relative to the star's geographical angle; Step 2: Update the polarization of the mobile communication antenna to the satellite's geographic angle based on the carrier's real-time location; Step 3: Calculate the target axis angle of polarization based on the geographical angle of the star and the carrier attitude information; Step 4: Determine the control strategy based on the polarization structure and drive the antenna polarization to rotate into position.

2. The method for controlling the polarization of a moving-mode antenna according to claim 1, characterized in that, The specific method for step 1 is as follows: (101) The polarization axis angle P is affected by different polarization structure forms. j Define it as follows: When the polarization structure can rotate continuously for 360°, the polarization axis angle P is defined. j Consistent with the polarization angle, i.e. -90° to 90°, where -90° and 90° coincide, and each rotation of the polarization structure corresponds to two polarization cycles; When the polarization structure can only rotate freely within a range of ≥180°, the polarization axis angle P is defined according to the actual rotation range within the range of -180° to 180°. j ; (102) Calculate the geocentric angle P of the on-the-go antenna polarization based on satellite information and carrier location information. d : ； In the formula, λ0 is the satellite longitude, λ is the carrier longitude, and φ is the carrier latitude; (103) Initially preset the polarization for different polarization structure forms: When the polarization structure can rotate continuously by 360°, the initial position of the polarization is preset to the angle closest to the current polarization position based on the polarization's geographic angle to the star. The specific method is as follows: 1) Calculate the polarization relative to the geographic angle P of the star. d and polarization axis angle P j The angle difference Δ is updated to Δ-180° when Δ is greater than 90° and to Δ+180° when Δ is less than -90°. 2) The sign of the Δ value determines the direction of polarization rotation: When the sign of the Δ value is positive, the polarization axis angle is preset to P in a clockwise direction. d When the Δ value is negative, the polarization axis angle is reversed and preset to P. d ; When the polarization mechanism can rotate freely only within a range of ≥180°, the initial polarization position is preset to the position farthest from the polarization limit based on the polarization geographic angle to the star. The specific method is as follows: 1) Determine the polarization design margin P based on the polarization rotation range. th : P th = (P CW -P CCW -180) / 2 In the formula, P CW P is the polarization finite angle value. CCW This is the polarization inverse limit angle value; 2) If P d Greater than P CW - P th Then the polarization axis angle will be preset to P. d -180; otherwise, if P d Less than P CCW + P th Then the polarization axis angle will be preset to P. d +180; otherwise, preset the polarization axis angle to P. d .

3. The method for controlling the polarization of a moving-mode antenna according to claim 1, characterized in that, The specific method for step 3 is as follows: According to the polarization of the on-the-fly antenna and the geographical angle P of the star d In addition to the tilt and pitch of the carrier, the target axis angle P of polarization is calculated. jm : ； In the formula, A j E is the azimuth axis angle of the antenna. j R is the elevation axis angle of the antenna, P is the pitch angle of the carrier, and R is the roll angle of the carrier.

4. The method for controlling the polarization of a moving-mode antenna according to claim 1, characterized in that, The specific method for step 4 is as follows: (401) Determine the control strategy for different polarization structures: When the polarization mechanism can rotate continuously for 360°, execute (403) directly; otherwise, preset the polarization dewinding threshold R according to the motion characteristics of the carrier platform. Th : For vehicles, R Th The value range is 8° to 10°. For ships, R Th The value range is 20° to 30°. For airplanes, R Th The value range is 30° to 35°; (402) Based on the polarization of the star's geographic angle P d and polarization around the threshold R Th The decision is whether to rotate 180° in the opposite direction to unwind: a) When the polarization is close to the limit position and the carrier is horizontal, when the polarization angle is less than R from the limit angle. Th At that time, the polarization target axis angle P will be... jm The value is updated to P jm -180°; b) When the polarization is close to the inverse limit and the carrier is horizontal, when the polarization angle is less than R from the inverse limit angle. Th At that time, the polarization target axis angle P will be... jm The value is updated to P jm +180°; (403) Drive the antenna to polarize to the target axis angle P jm .

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