A calibration method for satellite-borne phased array antenna in the whole satellite state

Abstract

The present invention relates to the technical field of satellite phased array antenna calibration, and discloses a calibration method for satellite-borne phased array antenna in the whole satellite state, including: S1. placing a laser ranging device on point O; S2. selecting three points on the satellite-borne phased array antenna that meet preset position conditions according to the antenna coordinate system; the preset position conditions are perpendicular to and between two lines, parallel to the Y axis, and parallel to the X axis; S3. respectively measuring the distances OA, OB, and OC between the laser ranging device and the three points on the satellite-borne phased array antenna; S4. substituting the lengths of OA, OB, OC, and into preset azimuth angle formulas, off-axis angles, and accuracy formulas to obtain measurement results. The present invention has few measuring devices; and does not need to contact with the satellite or the satellite-borne phased array antenna being measured during measurement, can realize long-distance measurement, and realize measurement of the satellite in a suspended state at a height above the ground.

Description

Technical Field

[0001] The present invention relates to the technical field of satellite phased array antenna calibration, and in particular to a calibration method for a satellite-borne phased array antenna in an intact satellite state. Background Art

[0002] Currently, there are two main methods for measuring satellite phased array antenna calibration. The first is to install calibration equipment on the onboard phased array antenna and align it with the ground measurement antenna to obtain the azimuth and off-axis angle. If the satellite is suspended high, it will make the equipment operation more difficult and the measurement plan complicated; the operation distance is close to the onboard antenna, and there is a risk of collision; the suspended satellite and antenna will come into contact during the debugging process, causing the whole satellite to swing, resulting in unstable angle calibration; another method is to use theodolite to operate and measure on the ground, but this method is technically difficult, the equipment is expensive, and the operation is complicated.

[0003] Based on this, technical personnel in this field urgently need to develop a new measurement solution to reduce operation complexity and cost while ensuring measurement accuracy. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects existing in the above-mentioned prior art, thereby providing a calibration method for a satellite-borne phased array antenna in the whole satellite state, which has a simple and fast measurement method and a low measurement cost; and does not require direct contact with the satellite-borne phased array antenna.

[0005] A method for calibrating a satellite-borne phased array antenna in an integrated satellite state comprises the following steps:

[0006] S1. Place the laser ranging device at point O;

[0007] S2. According to the antenna coordinate system Select the satellite phased array antenna that meets the preset position conditions. Three points; the preset position conditions are and The two lines are perpendicular to each other. Parallel to the Y axis, Parallel to the X axis;

[0008] S3. Measure the laser ranging device to three points on the satellite-borne phased array antenna The distances between OA, OB and OC;

[0009] S4. Place the laser ranging device at three points on the satellite-borne phased array antenna The distance between and Substitute the length into the preset azimuth angle formula, off-axis angle and accuracy formula to obtain the measurement result.

[0010] Preferably, the method further comprises solving the point based on the Pythagorean theorem of a right triangle. coordinate , specifically including the following steps:

[0011] S101. Set point The coordinates are ,point The coordinates are , by point Towards Make a vertical line , intersects with surface ABC at point E, then the coordinates of point E are Triangle ABC is a right triangle; the midpoint of line AC is D, and point D is the geometric center of the satellite-borne phased array antenna;

[0012] S102. According to the Pythagorean theorem of a right triangle, a system of equations is established for the right triangle OEC, the right triangle OEB and the right triangle OEA to solve the coordinates of the point O. .

[0013] Preferably, the equation system is expressed as:

[0014] From the right triangle OEC we get ;

[0015] OEB ;

[0016] From the right triangle OEA we get ;

[0017] In the formula, Indicates the OC length; Indicates the length of AB, Indicates the BC length.

[0018] Preferably, the coordinates of point D are ; Vector DO is The off-axis angle is the angle between the vector DO and the positive axis of the Z axis, and the azimuth angle θ is the clockwise angle between the vector DE and the positive axis of the X axis;

[0019] Axis angle ;

[0020] Azimuth angle .

[0021] Preferably, the method further comprises: measuring the lengths of AB, BC and AC on the satellite-borne phased array antenna in two ways;

[0022] One is to measure the lengths of AB, BC and AC on the actual spaceborne phased array antenna by direct measurement;

[0023] The other method is to measure the lengths of AB, BC and AC in the satellite-borne phased array antenna model through a model measurement method.

[0024] The technical solution of the present invention has the following advantages:

[0025] The present invention provides a phase measurement method based on laser ranging. The overall measurement method is simple and fast, the measurement method cost is low, and few measuring devices are involved. It does not need to directly contact the antenna and will not cause the satellite to swing in a suspended state. It can realize long-distance measurement and realize the measurement of the satellite in a suspended state at a height above the ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 This is a schematic diagram of the angle calibration of the satellite-borne phased array antenna in the whole satellite state;

[0028] Figure 2 Schematic diagram of the geometric relationship between the satellite-borne phased array antenna and the ground test antenna. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] Example 1

[0034] A method for calibrating a satellite-borne phased array antenna in an integrated satellite state comprises the following steps:

[0035] S1. Place the laser ranging device at point O;

[0036] S2. According to the antenna coordinate system Select the antenna that meets the preset position conditions. Three points; the preset position conditions are and The two lines are perpendicular to each other. Parallel to the Y axis, Parallel to the X axis;

[0037] S3. Measure the laser ranging device to three points on the satellite-borne phased array antenna The distances between OA, OB and OC;

[0038] S4. Place the laser ranging device at three points on the satellite-borne phased array antenna The distance between and Substitute the length into the preset azimuth angle formula and off-axis angle formula to obtain the measurement result.

[0039] Specifically:

[0040] like Figure 1 As shown in Figure 1, in the process of testing the gain of the spaceborne phased array antenna, the ground measurement antenna needs to be placed at Figure 1 At point O in the middle, it is necessary to know the phase position of O at the satellite-borne phased array antenna. Figure 2 This is a diagram of the geometric relationship between the satellite-borne phased array antenna and the ground test antenna.

[0041] Based on this, the method steps in this embodiment also include solving the coordinates of point O based on the Pythagorean theorem of a right triangle , specifically including the following steps:

[0042] S101. Set point The coordinates are ,point The coordinates are , by point Towards Make a vertical line , intersects with surface ABC at point E, then the coordinates of point E are Triangle ABC is a right triangle; the midpoint of line AC is D, and point D is the geometric center of the satellite-borne phased array antenna;

[0043] S102. According to the Pythagorean theorem of a right triangle, a system of equations is established for the right triangle OEC, the right triangle OEB and the right triangle OEA to solve the coordinates of the point O. .

[0044] Furthermore, in this embodiment, the right triangle Pythagorean theorem solves the point coordinate The equations used are:

[0045] From the right triangle OEC we get ;

[0046] From the right triangle OEB we have ;

[0047] From the right triangle OEA we get ;

[0048] Solve the three unknowns m, s, and n through the system of equations:

[0049] ;

[0050] ;

[0051] ;

[0052] Neutralization Figure 2 middle, Indicates the OC length; Indicates the length of AB, Indicates the BC length.

[0053] In this embodiment, the coordinates of point D are ; Vector DO is The off-axis angle is the angle between the vector DO and the positive axis of the Z axis, and the azimuth angle θ is the clockwise angle between the vector DE and the positive axis of the X axis;

[0054] Axis angle ;

[0055] Azimuth angle .

[0056] In addition, the actual implementation also includes: measuring the lengths of AB, BC and AC on the spaceborne phased array antenna in two ways;

[0057] One is to measure the lengths of AB, BC and AC on the actual spaceborne phased array antenna by direct measurement;

[0058] The other method is to measure the lengths of AB, BC and AC in the satellite-borne phased array antenna model through a model measurement method.

[0059] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A method for calibrating a satellite-borne phased array antenna in the whole satellite state, characterized in that: The following steps are involved: S1. Place the laser distance measuring device at point O, O coordinate ; S2. Select three points A, B, and C on the satellite-borne phased array antenna that meet the preset position conditions according to the antenna coordinate system X, Y, and Z; the preset position conditions are that the two lines AB and BC are perpendicular to each other, AB is parallel to the Y axis, and BC is parallel to the X axis; S3. Measure the laser ranging device to three points on the satellite-borne phased array antenna The distances between OA, OB and OC; S4. Substitute the lengths of OA, OB, OC, AB, and BC into the preset azimuth angle formula and off-axis angle formula to obtain the measurement results; Wherein, the coordinates of the point O are solved based on the Pythagorean theorem of a right triangle , specifically including the following steps: S101. Set the coordinates of point O to , the coordinates of point B are , by point Draw a perpendicular line OE to the surface ABC, intersecting the surface ABC at point E. The coordinates of point E are , triangle ABC is a right triangle; the midpoint of line AC is taken as D, and point D is the geometric center of the satellite-borne phased array antenna; S102. According to the Pythagorean theorem of a right triangle, a system of equations is established for the right triangle OEC, the right triangle OEB and the right triangle OEA to solve the coordinates of the point O. ; The equation system is expressed as: From the right triangle OEC we get ; From the right triangle OEB we have ; From the right triangle OEA we get ; In the formula, Indicates the length of OA, Indicates the OB length, Indicates the OC length; Indicates the length of AB, Indicates BC length; The coordinates of point D are ; Vector DO is The off-axis angle is the angle between the vector DO and the positive axis of the Z axis, and the azimuth angle θ is the clockwise angle between the vector DE and the positive axis of the X axis; Off-axis angle ; Azimuth angle .

2. The method for calibrating a satellite-borne phased array antenna in the whole satellite state according to claim 1, characterized in that: Also includes: The lengths of AB, BC and AC on the spaceborne phased array antenna were measured in two ways; One is to measure the lengths of AB, BC and AC on the actual spaceborne phased array antenna by direct measurement; The other method is to measure the lengths of AB, BC and AC in the satellite-borne phased array antenna model through a model measurement method.

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