Method for measuring amplitude-phase performance of quiet zone of compact range measurement system

Abstract

The invention provides a method for measuring the amplitude-phase performance of a quiet zone of a compact range measurement system, and the method comprises the steps: directly employing a rotary table of the system as a scanning device for the measurement of the amplitude-phase performance of the quiet zone; the rotary table rotates to drive the measuring antenna to sample the performance of the quiet zone (namely, the amplitude value and the phase value of a received signal of the measuring antenna at each quiet zone measuring position), so that a quiet zone measuring plane (namely the rotating plane / table board of the measuring antenna) can be kept consistent (or parallel) with a working plane of a compact range measuring system; the accuracy of the amplitude-phase performance measurement of the quiet zone is ensured, and the cost of the measurement of the quiet zone is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of compact range testing, and in particular to a method for measuring quiet zone amplitude and phase performance of a compact range measurement system. Background Art

[0002] Microwave anechoic chambers are the main facilities for measuring the spatial radiation performance of wireless devices. They are widely used in multiple technical fields such as communications, radar, and perception. According to the differences in system measurement principles, microwave anechoic chambers are usually divided into three categories: far field, compact field, and near field. Among them, compact field microwave anechoic chambers have the advantages of small footprint, flexible use, and intuitive test results. They are the type that has been used more in recent years. Compact field measurement technology is an indirect far-field measurement technology. By using a parabolic reflection device to convert the spherical wave emitted by the feed source into a plane wave, a plane wave irradiation area with nearly uniform amplitude and phase distribution is formed in a certain area, that is, a quiet zone. Therefore, the quality of the quiet zone is the most important indicator for evaluating the compact field measurement system.

[0003] In order to evaluate the quiet zone quality of the compact field measurement system, the quiet zone amplitude and phase performance (such as amplitude tapering, amplitude ripple, phase change, etc.), cross polarization, background level and other indicators can be measured. Among them, the amplitude and phase performance is the most important and is also the indicator that must be measured under normal circumstances.

[0004] The goal of the quiet zone amplitude and phase performance measurement of the compact field measurement system is to scan the actual amplitude and phase consistency of each point on any expected equal phase plane in the quiet zone. Theoretically, all equal phase planes are perpendicular to the compact field radiation axis and parallel to the quasi-plane of the reflection surface. In actual measurement, the front, middle and rear equal phase planes can be selected as measurement planes. Several travel lines are selected in each measurement plane for equal measurement, and each travel line is scanned at a fixed interval that meets the standard requirements. Reference Figure 1 Usually, a pair of horizontal and vertical cross lines passing through the center point of the quiet zone are selected for scanning, and sometimes a pair of cross lines inclined at 45° are also scanned. The amplitude and phase characteristics of the scanning points on these travel lines are measured, and the amplitude and phase of these points are fitted to obtain quiet zone indicators such as amplitude taper, amplitude ripple, and phase change.

[0005] refer to Figure 2 During measurement, the above process can be realized by using a polar coordinate plane scanning frame or a rectangular coordinate plane scanning frame. The scanning frame is used to complete the plane movement of the measuring antenna in the measuring plane. Depending on the type of scanning frame, the plane movement can be completed in the form of polar coordinates or rectangular coordinates.

[0006] As mentioned above, the scanning plane for quiet zone performance measurement should be an equiphase plane perpendicular to the main axis of the compact field radiation, and its flatness error and straightness error should be better than 1 / 10 of the compact field phase requirement. This scanning plane is also the working plane of the compact field measurement system, that is, the rotation plane of the turntable when the compact field measures the test piece (or the two are parallel).

[0007] However, in the prior art, it is necessary to additionally set up a plane scanning frame (polar coordinate plane scanning frame or rectangular coordinate plane scanning frame) in the compact field measurement system to perform quiet zone measurement. Since the plane scanned by the plane scanning frame and the turntable rotation plane are not necessarily parallel (in most cases, there must be a difference between the scanning plane of the artificially set up plane scanning frame and the turntable rotation plane), the quiet zone measurement plane (the scanning plane corresponding to the plane scanning frame) and the actual working plane of the compact field (the turntable rotation plane) are not parallel, and the quiet zone measurement is meaningless.

[0008] In summary, the traditional quiet zone amplitude and phase performance measurement method of the compact field measurement system has technical problems of poor measurement accuracy and high measurement cost. Summary of the invention

[0009] In view of this, an object of the present invention is to provide a method for measuring quiet zone amplitude and phase performance of a compact field measurement system, so as to alleviate the technical problems of poor accuracy and high measurement cost of the conventional method for measuring quiet zone amplitude and phase performance of a compact field measurement system.

[0010] In a first aspect, an embodiment of the present invention provides a method for measuring quiet zone amplitude and phase performance of a compact range measurement system, wherein the compact range measurement system comprises: a feed source, a reflection surface, a turntable and a measuring instrument, wherein the table surface of the turntable is perpendicular to the incoming wave direction of the plane wave of the reflection surface, and the method comprises:

[0011] After the installation and debugging of the compact range measurement system is completed, the measurement antenna is installed at a preset starting quiet zone measurement position on the table, and the table is controlled to step and rotate one circle so that the measurement antenna reaches each quiet zone measurement position, and then the amplitude value and phase value of the received signal of the measurement antenna at each quiet zone measurement position are measured by the measuring instrument, wherein the number of the starting quiet zone measurement positions is multiple;

[0012] Correcting the amplitude value and phase value of the received signal of the measuring antenna at each of the quiet zone measurement positions to obtain the amplitude correction value and phase correction value of the received signal of the measuring antenna at each of the quiet zone measurement positions;

[0013] The quiet zone amplitude and phase performance of the compact range measurement system is calculated according to the amplitude correction value and the phase correction value of the received signal of the measurement antenna at each quiet zone measurement position.

[0014] Furthermore, after the installation and debugging of the compact range measurement system is completed, the table is located at a preset measurement plane in the quiet zone, and the rotation center of the table is located on the central axis of the quiet zone.

[0015] Furthermore, the tabletop is controlled to rotate once so that the measuring antenna reaches each quiet zone measuring position, including:

[0016] The measuring antenna reaches each quiet zone measurement position by controlling the table to rotate one circle with a preset angle step, wherein the interval between two adjacent starting quiet zone measurement positions meets the preset standard requirements, and the distance between the starting quiet zone measurement position farthest from the rotation center and the rotation center is not less than half of the quiet zone size, and the preset angle step is not greater than 90 degrees.

[0017] Further, the measuring antenna is installed at a preset starting quiet zone measuring position on the table, and the table is controlled to rotate step by step for one circle so that the measuring antenna reaches each quiet zone measuring position, including:

[0018] The starting quiet zone measurement positions are traversed in sequence to perform the following measurements until all starting quiet zone measurement positions are traversed:

[0019] Installing the measuring antenna along the normal direction at the starting quiet zone measuring position on the table, wherein the normal direction is the direction in which the polarization direction of the measuring antenna points to the rotation center;

[0020] The table is controlled to rotate for one circle at a preset angle step so that the measuring antenna reaches each quiet zone measurement position on the measurement circumference corresponding to the starting quiet zone measurement position, and then the amplitude value and phase value of the received signal of the normally installed measuring antenna at each quiet zone measurement position on the measurement circumference corresponding to the starting quiet zone measurement position are measured by the measuring instrument;

[0021] Installing the measuring antenna along a tangential direction at a starting quiet zone measuring position on the table, wherein the tangential direction is a direction orthogonal to the normal direction;

[0022] The table is controlled to rotate one circle at a preset angle step so that the measuring antenna reaches each quiet zone measurement position on the measuring circle corresponding to the starting quiet zone measurement position, and then the amplitude value and phase value of the received signal of the tangentially installed measuring antenna at each quiet zone measurement position on the measuring circle corresponding to the starting quiet zone measurement position are measured by the measuring instrument.

[0023] Further, the amplitude value of the received signal at each of the quiet zone measurement positions includes the amplitude value of the received signal of two orthogonal polarization components, and the phase value of the received signal at each of the quiet zone measurement positions includes the phase value of the received signal of two orthogonal polarization components, and the amplitude value and phase value of the received signal of the measuring antenna at each of the quiet zone measurement positions are corrected, including:

[0024] Calculating an amplitude correction value of a received signal of the measuring antenna at each of the quiet zone measurement positions according to amplitude values ​​of received signals of two orthogonal polarization components of the measuring antenna at each of the quiet zone measurement positions;

[0025] The phase correction value of the received signal of the measuring antenna at each of the quiet zone measurement positions is calculated according to the phase value of the received signal of the two orthogonal polarization components of the measuring antenna at each of the quiet zone measurement positions and the angle difference between each of the quiet zone measurement positions and the starting quiet zone measurement position.

[0026] Further, the amplitude value and phase value of the received signal of the measuring antenna at each of the quiet zone measurement positions are measurement data of the feed source in a vertical polarization state, and when the quiet zone measurement position is not the rotation center, the amplitude correction value of the received signal of the measuring antenna at each of the quiet zone measurement positions is calculated according to the amplitude values ​​of the received signals of the two orthogonal polarization components of the measuring antenna at each of the quiet zone measurement positions, including:

[0027] Use the amplitude correction formula The amplitude value of the received signal of the measuring antenna at each of the quiet zone measurement positions is corrected to obtain the amplitude correction value of the received signal of the measuring antenna at each of the quiet zone measurement positions, wherein A i，j represents the amplitude correction value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps of the measuring antenna at the i-th starting quiet zone measurement position, A i，j，n A represents the amplitude value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the i-th starting quiet zone measurement position when the measurement antenna is installed in the normal direction. i，j，t Indicates the amplitude value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the ith starting quiet zone measurement position when the tangentially installed measurement antenna steps forward;

[0028] Calculating a phase correction value of a received signal of the measuring antenna at each of the quiet zone measurement positions according to phase values ​​of received signals of two orthogonal polarization components of the measuring antenna at each of the quiet zone measurement positions and an angle difference between each of the quiet zone measurement positions and the starting quiet zone measurement position, comprising:

[0029] Use the phase value correction formula corresponding to the vertical polarization state

[0030] Correcting the phase value of the received signal of the measuring antenna at each of the quiet zone measurement positions to obtain the phase correction value of the received signal of the measuring antenna at each of the quiet zone measurement positions, wherein P i，j represents the phase correction value of the received signal of the quiet zone measurement position corresponding to the j preset angle steps of the measuring antenna at the i-th starting quiet zone measurement position, P i，j，n It represents the phase value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the i-th starting quiet zone measurement position when the measurement antenna is normally installed. i，j，t represents the phase value of the received signal at the quiet zone measurement position corresponding to the j-th preset angle step of the tangentially installed measurement antenna at the i-th starting quiet zone measurement position, ε(t) represents the step function, δ represents the preset angle step.

[0031] Further, if the amplitude value and phase value of the received signal of the measuring antenna at each of the quiet zone measurement positions are measurement data of the feed source in a vertical polarization state, and the quiet zone measurement position is the rotation center, the amplitude correction value of the received signal of the measuring antenna at each of the quiet zone measurement positions is calculated according to the amplitude values ​​of the received signals of the two orthogonal polarization components of the measuring antenna at each of the quiet zone measurement positions, including:

[0032] Use the rotation center amplitude value correction formula The amplitude value of the received signal of the measuring antenna at the rotation center is corrected to obtain the amplitude correction value of the received signal of the measuring antenna at the rotation center, wherein A0 represents the amplitude correction value of the received signal of the measuring antenna at the rotation center, and A 0，0，n A represents the amplitude of the signal received by the normally mounted measuring antenna at the rotation center. 0，90，n represents the amplitude value of the received signal of the tangentially mounted measuring antenna at the said rotation center;

[0033] Calculating a phase correction value of a received signal of the measuring antenna at each of the quiet zone measurement positions according to phase values ​​of received signals of two orthogonal polarization components of the measuring antenna at each of the quiet zone measurement positions and an angle difference between each of the quiet zone measurement positions and the starting quiet zone measurement position, comprising:

[0034] The rotation center phase value correction formula P0=P corresponding to the vertical polarization state is adopted 0，90，nThe phase value of the received signal of the measuring antenna at the rotation center is corrected to obtain the phase correction value of the received signal of the measuring antenna at the rotation center, wherein P0 represents the phase correction value of the received signal of the measuring antenna at the rotation center, and P 0，90，n It represents the phase value of the received signal of the tangentially mounted measuring antenna at the rotation center.

[0035] Further, if the amplitude value and phase value of the received signal of the measuring antenna at each of the quiet zone measurement positions are measurement data of the feed source in a horizontal polarization state, and the quiet zone measurement position is not the rotation center, the amplitude correction value of the received signal of the measuring antenna at each of the quiet zone measurement positions is calculated according to the amplitude values ​​of the received signals of the two orthogonal polarization components of the measuring antenna at each of the quiet zone measurement positions, including:

[0036] Use the amplitude correction formula The amplitude value of the received signal of the measuring antenna at each of the quiet zone measurement positions is corrected to obtain the amplitude correction value of the received signal of the measuring antenna at each of the quiet zone measurement positions, wherein A i，j represents the amplitude correction value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps of the measuring antenna at the i-th starting quiet zone measurement position, A i，j，n A represents the amplitude value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the i-th starting quiet zone measurement position when the measurement antenna is installed in the normal direction. i，j，t Indicates the amplitude value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the ith starting quiet zone measurement position when the tangentially installed measurement antenna steps forward;

[0037] Calculating a phase correction value of a received signal of the measuring antenna at each of the quiet zone measurement positions according to phase values ​​of received signals of two orthogonal polarization components of the measuring antenna at each of the quiet zone measurement positions and an angle difference between each of the quiet zone measurement positions and the starting quiet zone measurement position, comprising:

[0038] Use the phase value correction formula corresponding to the vertical polarization state

[0039] Correcting the phase value of the received signal of the measuring antenna at each of the quiet zone measurement positions to obtain the phase correction value of the received signal of the measuring antenna at each of the quiet zone measurement positions, wherein P i，j represents the phase correction value of the received signal of the quiet zone measurement position corresponding to the j preset angle steps of the measuring antenna at the i-th starting quiet zone measurement position, P i，j，nIt represents the phase value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the i-th starting quiet zone measurement position when the measurement antenna is normally installed. i，j，t represents the phase value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the ith starting quiet zone measurement position of the tangentially mounted measurement antenna, ε(t) represents the step function, δ represents the preset angle step.

[0040] Further, if the amplitude value and phase value of the received signal of the measuring antenna at each of the quiet zone measurement positions are measurement data of the feed source in a horizontal polarization state, and the quiet zone measurement position is the rotation center, the amplitude correction value of the received signal of the measuring antenna at each of the quiet zone measurement positions is calculated according to the amplitude values ​​of the received signals of the two orthogonal polarization components of the measuring antenna at each of the quiet zone measurement positions, including:

[0041] Use the rotation center amplitude value correction formula The amplitude value of the received signal of the measuring antenna at the rotation center is corrected to obtain the amplitude correction value of the received signal of the measuring antenna at the rotation center, wherein A0 represents the amplitude correction value of the received signal of the measuring antenna at the rotation center, and A 0，0，n A represents the amplitude of the signal received by the normally mounted measuring antenna at the rotation center. 0，90，n represents the amplitude value of the received signal of the tangentially mounted measuring antenna at the said rotation center;

[0042] Calculating a phase correction value of a received signal of the measuring antenna at each of the quiet zone measurement positions according to phase values ​​of received signals of two orthogonal polarization components of the measuring antenna at each of the quiet zone measurement positions and an angle difference between each of the quiet zone measurement positions and the starting quiet zone measurement position, comprising:

[0043] The rotation center phase value correction formula P0=P corresponding to the horizontal polarization state is adopted 0，0，n The phase value of the received signal of the measuring antenna at the rotation center is corrected to obtain the phase correction value of the received signal of the measuring antenna at the rotation center, wherein P0 represents the phase correction value of the received signal of the measuring antenna at the rotation center, and P 0，0，n It represents the phase value of the received signal of the normally mounted measuring antenna at the rotation center.

[0044] Furthermore, the measuring antenna is mounted on a preset starting quiet zone measuring position on the table through a fixture.

[0045] Furthermore, the measuring antenna is a single-polarized measuring antenna, and the fixture has a rotating mechanism.

[0046] Furthermore, the clamp can be detachably mounted on the table top through a program-controlled linear moving device, and the clamp can be moved along the radial direction of the table top through the program-controlled linear moving device.

[0047] In an embodiment of the present invention, a method for measuring quiet zone amplitude and phase performance of a compact range measurement system is provided. The compact range measurement system comprises: a feed source, a reflection surface, a turntable and a measuring instrument. The turntable surface is perpendicular to the incoming wave direction of the plane wave of the reflection surface. The method comprises: after the compact range measurement system is installed and debugged, a measuring antenna is installed at a preset starting quiet zone measurement position on the table surface, the table surface is controlled to step and rotate one circle so that the measuring antenna reaches each quiet zone measurement position, and then the amplitude value and phase value of the received signal of the measuring antenna at each quiet zone measurement position are measured by the measuring instrument, wherein the number of the starting quiet zone measurement positions is multiple; the amplitude value and phase value of the received signal of the measuring antenna at each quiet zone measurement position are corrected to obtain the amplitude correction value and phase correction value of the received signal of the measuring antenna at each quiet zone measurement position; and the quiet zone amplitude and phase performance of the compact range measurement system is calculated according to the amplitude correction value and phase correction value of the received signal of the measuring antenna at each quiet zone measurement position. It can be seen from the above description that in the quiet zone amplitude and phase performance measurement method of the compact range measurement system of the present invention, the system's own turntable is directly used as a scanning device for the quiet zone amplitude and phase performance measurement, and the measurement antenna is driven by the rotation of the turntable to sample the quiet zone performance (i.e., obtain the amplitude value and phase value of the received signal of the measurement antenna at each quiet zone measurement position), which can ensure that the quiet zone measurement plane (i.e., the rotation plane / table surface of the measurement antenna) is consistent with (or parallel to) the working plane of the compact range measurement system, thereby ensuring the accuracy of the quiet zone amplitude and phase performance measurement, reducing the cost of the quiet zone measurement, and alleviating the technical problems of poor accuracy and high measurement cost of the traditional quiet zone amplitude and phase performance measurement method of the compact range measurement system. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 Schematic diagram of the quiet zone measurement plane provided for conventional technology;

[0049] Figure 2 Schematic diagram of a polar coordinate plane scanning frame or a rectangular coordinate plane scanning frame provided by conventional technology;

[0050] Figure 3 A flowchart of a method for measuring quiet zone amplitude and phase performance of a compact field measurement system provided by an embodiment of the present invention;

[0051] Figure 4 A schematic diagram of a compact range measurement system provided by an embodiment of the present invention;

[0052] Figure 5 A schematic diagram of another compact range measurement system provided by an embodiment of the present invention;

[0053] Figure 6 A schematic diagram of a quiet zone measurement plane provided by an embodiment of the present invention;

[0054] Figure 7 A schematic diagram of the polarization direction of a measurement antenna provided in an embodiment of the present invention;

[0055] Figure 8 A schematic diagram of a starting quiet zone measurement position provided by an embodiment of the present invention;

[0056] Fig. 9 A schematic diagram of the installation of a measurement antenna provided by an embodiment of the present invention;

[0057] Fig.10 A schematic diagram of rotating at a preset angle step provided by an embodiment of the present invention;

[0058] Fig.11 A schematic diagram of yet another compact range measurement system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0059] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. 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.

[0060] The traditional quiet zone amplitude and phase performance measurement method of the compact field measurement system has the technical problems of poor measurement accuracy and high measurement cost.

[0061] Based on this, in the quiet zone amplitude and phase performance measurement method of the compact range measurement system of the present invention, the system's own turntable is directly used as a scanning device for the quiet zone amplitude and phase performance measurement, and the measurement antenna is driven by the rotation of the turntable to sample the quiet zone performance (i.e., obtain the amplitude value and phase value of the received signal of the measurement antenna at each quiet zone measurement position), which can ensure that the quiet zone measurement plane (i.e., the rotation plane / table surface of the measurement antenna) is consistent with (or parallel to) the working plane of the compact range measurement system, thereby ensuring the accuracy of the quiet zone amplitude and phase performance measurement and reducing the cost of the quiet zone measurement.

[0062] To facilitate understanding of this embodiment, a quiet zone amplitude and phase performance measurement method of a compact field measurement system disclosed in an embodiment of the present invention is first introduced in detail.

[0063] Embodiment 1:

[0064] According to an embodiment of the present invention, an embodiment of a method for measuring the quiet zone amplitude and phase performance of a compact field measurement system is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0065] Figure 3 FIG. 4 is a flow chart of a method for measuring quiet zone amplitude and phase performance of a compact field measurement system according to an embodiment of the present invention. Figure 3 As shown, the method comprises the following steps:

[0066] Step S302: after the installation and debugging of the compact range measurement system is completed, the measurement antenna is installed at a preset starting quiet zone measurement position on the table, and the table is controlled to step and rotate one circle so that the measurement antenna reaches each quiet zone measurement position, and then the amplitude value and phase value of the received signal of the measurement antenna at each quiet zone measurement position are measured by a measuring instrument, wherein the number of the starting quiet zone measurement positions is multiple;

[0067] In the embodiment of the present invention, reference Figure 4 and Figure 5 The compact field measurement system includes: a feed source, a reflector, a turntable and a measuring instrument, wherein the turntable surface is perpendicular to the incoming wave direction of the plane wave of the reflector. Specifically, the turntable is used to clamp the measuring antenna (specifically, the measuring antenna is installed on the turntable surface) and drive the measuring antenna to rotate.

[0068] like Figure 6 As shown in the figure, after the installation and debugging of the compact range measurement system is completed, the measurement antenna is installed at the preset starting quiet zone measurement position on the table (such as Figure 61, 2, 3, 4 in the figure), the control surface is rotated step by step for one circle so that the measuring antenna reaches each quiet zone measurement position, and then the amplitude value and phase value of the received signal of the measuring antenna at each quiet zone measurement position are measured by the measuring instrument. When implemented, the measuring antenna is installed at the second starting quiet zone measurement position on the turntable, the control surface is rotated for one circle so that the measuring antenna reaches each preset quiet zone measurement position, and then the amplitude value and phase value of the received signal of the measuring antenna at each quiet zone measurement position are measured by the measuring instrument; the measuring antenna is moved to the next starting quiet zone measurement position in turn, the control surface is rotated for one circle so that the measuring antenna reaches each preset quiet zone measurement position, and then the amplitude value and phase value of the received signal of the measuring antenna at each quiet zone measurement position are measured by the measuring instrument; until the amplitude value and phase value of the received signal of all preset quiet zone measurement positions are obtained. Alternatively, multiple measuring antennas may be installed at multiple starting quiet zone measurement positions on a table top at the same time (one measuring antenna is installed at each starting quiet zone measurement position), and the table top may be controlled to step and rotate one circle so that the measuring antenna reaches all the quiet zone measurement positions, and then the amplitude and phase values ​​of the received signals of the measuring antenna at each quiet zone measurement position may be obtained by measuring with a measuring instrument.

[0069] Step S304, correcting the amplitude value and phase value of the received signal of the measuring antenna at each quiet zone measurement position to obtain the amplitude correction value and phase correction value of the received signal of the measuring antenna at each quiet zone measurement position;

[0070] Specifically, Figure 7 As shown in the figure, when the measuring antenna rotates with the table, its polarization direction also changes accordingly. Therefore, at each quiet zone measurement position, two orthogonal polarization components (i.e., the normal component and the tangential component, specifically, the amplitude value component of the normal received signal, the amplitude value component of the tangential received signal, the phase value component of the normal received signal, and the phase value component of the tangential received signal) need to be measured, and the two orthogonal polarization components are corrected to obtain the equivalent values ​​when they are parallel to the vertical or horizontal polarization direction (i.e., the amplitude correction value and the phase correction value of the received signal, i.e. Figure 7 The vertical polarization in the measurement antenna is used to obtain the amplitude value / phase value of the signal received when the polarization direction of the measurement antenna at each quiet zone measurement position is consistent with the polarization direction of the feed source).

[0071] The correction process will be described in detail below and will not be elaborated here.

[0072] Step S306, calculating the quiet zone amplitude and phase performance of the compact range measurement system according to the amplitude correction value and phase correction value of the received signal of the measurement antenna at each quiet zone measurement position.

[0073] Specifically, the above-mentioned quiet zone amplitude and phase performance may include: taper, ripple, amplitude variation, phase variation, etc., and two-dimensional plane sampling values ​​may also be integrated to fit a two-dimensional amplitude / phase distribution diagram, and calculate two-dimensional taper / ripple and other amplitude and phase characteristic indicators. The specific calculation of this part may refer to the method in the prior art.

[0074] In an embodiment of the present invention, a method for measuring quiet zone amplitude and phase performance of a compact range measurement system is provided. The compact range measurement system comprises: a feed source, a reflection surface, a turntable and a measuring instrument. The turntable surface is perpendicular to the incoming wave direction of the plane wave of the reflection surface. The method comprises: after the compact range measurement system is installed and debugged, a measuring antenna is installed at a preset starting quiet zone measurement position on the table surface, the table surface is controlled to step and rotate one circle so that the measuring antenna reaches each quiet zone measurement position, and then the amplitude value and phase value of the received signal of the measuring antenna at each quiet zone measurement position are measured by the measuring instrument, wherein the number of the starting quiet zone measurement positions is multiple; the amplitude value and phase value of the received signal of the measuring antenna at each quiet zone measurement position are corrected to obtain the amplitude correction value and phase correction value of the received signal of the measuring antenna at each quiet zone measurement position; and the quiet zone amplitude and phase performance of the compact range measurement system is calculated according to the amplitude correction value and phase correction value of the received signal of the measuring antenna at each quiet zone measurement position. It can be seen from the above description that in the quiet zone amplitude and phase performance measurement method of the compact range measurement system of the present invention, the system's own turntable is directly used as a scanning device for the quiet zone amplitude and phase performance measurement, and the measurement antenna is driven by the rotation of the turntable to sample the quiet zone performance (i.e., obtain the amplitude value and phase value of the received signal of the measurement antenna at each quiet zone measurement position), which can ensure that the quiet zone measurement plane (i.e., the rotation plane / table surface of the measurement antenna) is consistent with (or parallel to) the working plane of the compact range measurement system, thereby ensuring the accuracy of the quiet zone amplitude and phase performance measurement, reducing the cost of the quiet zone measurement, and alleviating the technical problems of poor accuracy and high measurement cost of the traditional quiet zone amplitude and phase performance measurement method of the compact range measurement system.

[0075] The above content briefly introduces the quiet zone amplitude and phase performance measurement method of the compact range measurement system of the present invention. The specific contents involved are described in detail below.

[0076] In an optional embodiment of the present invention, after the compact range measurement system is installed and debugged, the table is located at a preset measurement plane in the quiet zone, and the rotation center of the table is located on the central axis of the quiet zone. The above requirements are usually also requirements for the design of compact range measurement systems.

[0077] In an optional embodiment of the present invention, the measurement antenna is made to reach each quiet zone measurement position by rotating the control table one circle, which specifically includes the following steps:

[0078] The measurement antenna reaches each quiet zone measurement position by rotating the control table in a preset angle step for one circle, wherein the interval between two adjacent starting quiet zone measurement positions meets the preset standard requirements, and the distance between the starting quiet zone measurement position farthest from the rotation center and the rotation center is not less than half of the quiet zone size, and the preset angle step is not greater than 90 degrees. Multiple starting quiet zone measurement positions are preset positions starting from the rotation center and traversing to the boundary of the quiet zone in sequence.

[0079] refer to Figure 6 , the starting quiet zone measurement positions are 1, 2, 3 in the figure, etc., extending outward to the boundary of the quiet zone (that is, the distance between the starting quiet zone measurement position farthest from the rotation center and the rotation center is not less than half of the quiet zone size). It should be noted that 1 is located at the rotation center position, so sampling at this point (that is, measuring the amplitude and phase values ​​of the received signal of the measuring antenna at the quiet zone measurement position through the measuring instrument) does not require the table to rotate. The interval between two adjacent starting quiet zone measurement positions needs to meet the requirements of the aforementioned standards. The angular interval (that is, the preset angle step) of adjacent quiet zone measurement positions during the rotation of the turntable (that is, the table) needs to be ≤90°, Figure 6 As shown in the figure, 45° is obtained. The turntable rotates one circle to obtain sampling data (ie, amplitude and phase values ​​of the received signal) of 8 quiet zone measurement positions in a circular path.

[0080] In an optional embodiment of the present invention, a measuring antenna is installed at a preset starting quiet zone measurement position on a table, and the table is controlled to rotate step by step for one circle so that the measuring antenna reaches each quiet zone measurement position, which specifically includes the following steps:

[0081] The starting quiet zone measurement positions are traversed in sequence to perform the following measurements until all starting quiet zone measurement positions are traversed:

[0082] (1) Install the measuring antenna along the normal direction at the starting quiet zone measurement position on the table, where the normal direction is the direction in which the polarization direction of the measuring antenna points to the rotation center;

[0083] More specifically, refer to Figure 8, for the convenience of description, the quiet zone measurement coordinate system is defined here: facing the table surface direction of the turntable, the coordinate system is established with the center of the quiet zone measurement plane (i.e., the rotation center of the table surface) as the origin, the horizontal right is the positive direction of the X-axis, and the vertical upward is the positive direction of the Y-axis. Define the counterclockwise rotation of the measurement antenna driven by the turntable as the positive direction of the angle. In the positive direction of the X-axis, the installation position of the measurement antenna is calibrated at intervals of 1 / 8 of the minimum coherent wavelength λ (standard requirements) (i.e., the interval between two adjacent starting quiet zone measurement positions meets the preset standard requirements, and the preset standard requirements are less than or equal to 1 / 8 of the minimum coherent wavelength λ). A total of p measurement antenna installation positions from 0 to p-1 are calibrated in sequence, and (p-1)*λ / 8 must reach at least half of the quiet zone size (i.e., the distance between the starting quiet zone measurement position farthest from the rotation center and the rotation center is not less than half of the quiet zone size). The 0th measurement antenna installation position is the origin of the coordinate system (0,0), and the coordinates of the i-th measurement antenna installation position are (i*λ / 8,0). Reference Fig. 9 Here, a single-polarization standard gain horn antenna is used as the measurement antenna (that is, the measurement antenna is a single-polarization measurement antenna). The antenna installation method when the polarization direction of the measurement antenna is parallel to the X-axis is defined as normal installation; the antenna installation method when the polarization direction of the measurement antenna is perpendicular to the X-axis (that is, parallel to the Y-axis) is defined as tangential installation, that is, the installation method rotated 90° counterclockwise from the normal installation direction.

[0084] (2) the control table is rotated by a preset angle step to make the measuring antenna reach each quiet zone measurement position on the measuring circle corresponding to the starting quiet zone measurement position, and then the amplitude value and phase value of the received signal of the normally installed measuring antenna at each quiet zone measurement position on the measuring circle corresponding to the starting quiet zone measurement position are measured by a measuring instrument;

[0085] (3) Install the measurement antenna along the tangential direction at the starting quiet zone measurement position on the table, where the tangential direction is a direction orthogonal to the normal direction;

[0086] (4) The control table is controlled to rotate one circle at a preset angle step so that the measuring antenna reaches each quiet zone measurement position on the measuring circle corresponding to the starting quiet zone measurement position, and then the amplitude value and phase value of the received signal of the tangentially installed measuring antenna at each quiet zone measurement position on the measuring circle corresponding to the starting quiet zone measurement position are measured by a measuring instrument.

[0087] It should be noted that when the starting quiet zone measurement position is the rotation center, the two measurement angles at the rotation center are consistent with the normal installation and tangential installation angles of other starting quiet zone measurement positions.

[0088] Specifically, the quiet zone amplitude and phase performances are measured in two polarization states (vertical polarization state and horizontal polarization state) of the feed source respectively.

[0089] The specific steps of the measurement are introduced again below:

[0090] (1) Switch the feed to vertical polarization and perform quiet zone performance sampling;

[0091] (2) Install the measurement antenna in the normal direction at the 0th installation position and use a vector network analyzer to measure the amplitude value A of the received signal at the current position. 0，0，n and phase value P 0，0，n Then, the turntable is controlled to rotate 90°, and the amplitude value A of the received signal at the current position is measured using a vector network analyzer. 0，90，n and phase value P 0，90，n ;

[0092] (3) Reset the rotating axis of the turntable, install the measuring antenna in the first installation position along the normal direction, and measure the amplitude value A of the signal in this position. 1，0，n and phase value P 1，0，n . refer to Fig.10 Next, the turntable is rotated one circle with a fixed angle step δ (i.e., the preset angle step) and sampled. From 1 to q-1, a total of q-1 angles are rotated, plus the initial reset angle (recorded as the 0th angle), a total of q angles. Here, δ≤45° (empirical value) is required, and δ·q=360°. The amplitude and phase of the signal are measured using a vector network analyzer at each angle, and the measured value at the jth angle is recorded as A 1，j，n and P 1，j，n .

[0093] (4) Reset the rotating axis of the turntable and install the measuring antenna tangentially at the first installation position (the two polarization directions of the 0th installation position have been measured in the previous (2)). Repeat the process of (3). The measured values ​​of amplitude and phase at the jth angle are recorded as A and 1，j，t and P 1，j，t .

[0094] (5) Repeat the process of (3) and (4) at the 2nd, 3rd, ..., p-1th installation positions respectively, and obtain the amplitude and phase sampling values ​​of the normal and tangential directions at the i-th installation position and the j-th angle (i.e., the quiet zone measurement position corresponding to the i-th starting quiet zone measurement position and stepping i preset angle steps) as A respectively. i，j，n , P i，j，n , A i，j，t , P i，j，t , 1≤i≤p-1, 0≤j≤q-1.

[0095] Switch the feed to horizontal polarization and perform quiet zone performance sampling. The specific method is the same as the process (1)-(5).

[0096] It should be noted that the operation sequence is not limited to the sequence of this embodiment. For ease of understanding, the sampling of the two polarization directions of the feed source is described separately. In other embodiments, the polarization direction of the feed source may be switched at each measurement position for separate sampling.

[0097] In an optional embodiment of the present invention, the amplitude value of the received signal at each quiet zone measurement position includes the amplitude value of the received signal of two orthogonal polarization components, and the phase value of the received signal at each quiet zone measurement position includes the phase value of the received signal of two orthogonal polarization components. The amplitude value and phase value of the received signal of the measuring antenna at each quiet zone measurement position are corrected, specifically including the following steps:

[0098] (1) calculating an amplitude correction value of a received signal of the measuring antenna at each quiet zone measurement position according to amplitude values ​​of received signals of two orthogonal polarization components of the measuring antenna at each quiet zone measurement position;

[0099] Specifically, the correction is to obtain the amplitude value / phase value of the signal received when the polarization direction of the measurement antenna at each quiet zone measurement position is consistent with the polarization direction of the feed source.

[0100] (2) Calculating a phase correction value of the received signal of the measuring antenna at each quiet zone measurement position according to the phase values ​​of the received signals of the two orthogonal polarization components of the measuring antenna at each quiet zone measurement position and the angle difference between each quiet zone measurement position and the starting quiet zone measurement position.

[0101] In an optional embodiment of the present invention, if the amplitude value and phase value of the received signal of the measuring antenna at each quiet zone measurement position are measurement data when the feed source is in a vertical polarization state, and the quiet zone measurement position is not the rotation center, the amplitude correction value of the received signal of the measuring antenna at each quiet zone measurement position is calculated according to the amplitude value of the received signal of two orthogonal polarization components of the measuring antenna at each quiet zone measurement position, specifically including the following steps:

[0102] Use the amplitude correction formula The amplitude value of the received signal of the measuring antenna at each quiet zone measurement position is corrected to obtain the amplitude correction value of the received signal of the measuring antenna at each quiet zone measurement position, where A i，j A represents the amplitude correction value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the i-th starting quiet zone measurement position. i，j，n A represents the amplitude value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the i-th starting quiet zone measurement position when the measurement antenna is installed in the normal direction. i，j，t Indicates the amplitude value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the ith starting quiet zone measurement position when the tangentially installed measurement antenna steps forward;

[0103] The phase correction value of the received signal of the measuring antenna at each quiet zone measurement position is calculated according to the phase value of the received signal of the two orthogonal polarization components of the measuring antenna at each quiet zone measurement position and the angle difference between each quiet zone measurement position and the initial quiet zone measurement position, specifically comprising the following steps:

[0104] Use the phase value correction formula corresponding to the vertical polarization state

[0105] The phase value of the received signal of the measuring antenna at each quiet zone measurement position is corrected to obtain the phase correction value of the received signal of the measuring antenna at each quiet zone measurement position, where P i，j It represents the phase correction value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the i-th starting quiet zone measurement position, P i，j，n It represents the phase value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the i-th starting quiet zone measurement position when the measurement antenna is normally installed. i，j，t represents the phase value of the received signal at the quiet zone measurement position corresponding to the j-th preset angle step of the tangentially installed measurement antenna at the i-th starting quiet zone measurement position, ε(t) represents the step function, δ represents the preset angle step.

[0106] Specifically, for the sampled data with vertical polarization as the feed source:

[0107] The amplitude and phase sampling values ​​of the normal and tangential directions of the measurement antenna at the i-th installation position and the j-th angle are A and i，j，n , P i，j，n , A i，j，t , P i，j，t , 1≤i≤p-1, 0≤j≤q-1.

[0108] The correction method is:

[0109]

[0110] Where ε(t) represents the step function, All amplitude values ​​in the formula are calculated in linear units rather than dB units.

[0111] In an optional embodiment of the present invention, if the amplitude value and phase value of the received signal of the measuring antenna at each quiet zone measurement position are measurement data when the feed source is in a vertical polarization state, and the quiet zone measurement position is the rotation center, the amplitude correction value of the received signal of the measuring antenna at each quiet zone measurement position is calculated according to the amplitude value of the received signal of the two orthogonal polarization components of the measuring antenna at each quiet zone measurement position, specifically including the following steps:

[0112] Use the rotation center amplitude value correction formula The amplitude value of the received signal of the measuring antenna at the rotation center is corrected to obtain the amplitude correction value of the received signal of the measuring antenna at the rotation center, wherein A0 represents the amplitude correction value of the received signal of the measuring antenna at the rotation center, and A 0，0，n A represents the amplitude of the received signal at the rotation center of the normally mounted measuring antenna. 0，90，n Indicates the amplitude value of the received signal at the rotation center of the tangentially mounted measuring antenna;

[0113] The phase correction value of the received signal of the measuring antenna at each quiet zone measurement position is calculated according to the phase value of the received signal of the two orthogonal polarization components of the measuring antenna at each quiet zone measurement position and the angle difference between each quiet zone measurement position and the initial quiet zone measurement position, specifically comprising the following steps:

[0114] The rotation center phase value correction formula P0=P corresponding to the vertical polarization state is adopted 0，90，n The phase value of the received signal of the measuring antenna at the rotation center is corrected to obtain the phase correction value of the received signal of the measuring antenna at the rotation center, wherein P0 represents the phase correction value of the received signal of the measuring antenna at the rotation center, and P 0，90，n Indicates the phase value of the received signal at the rotation center of the tangentially mounted measurement antenna.

[0115] Specifically, for the sampled data with vertical polarization as the feed source:

[0116] For i=0, that is, at the origin of the coordinate system, since the measurement position will not change no matter how the turntable rotates, the coordinates of this point have only one component. The sampling data correction method of this sampling point is:

[0117]

[0118] P0=P 0，90，n

[0119] So far, the data correction values ​​of all sampling points are obtained. In polar coordinate form, the sampling data correction value at the coordinate (i*λ / 8, j*δ) is A i，j and P i，j .

[0120] In an optional embodiment of the present invention, if the amplitude value and phase value of the received signal of the measuring antenna at each quiet zone measurement position are measurement data when the feed source is in a horizontal polarization state, and the quiet zone measurement position is not the rotation center, the amplitude correction value of the received signal of the measuring antenna at each quiet zone measurement position is calculated according to the amplitude value of the received signal of the two orthogonal polarization components of the measuring antenna at each quiet zone measurement position, specifically including the following steps:

[0121] Use the amplitude correction formula The amplitude value of the received signal of the measuring antenna at each quiet zone measurement position is corrected to obtain the amplitude correction value of the received signal of the measuring antenna at each quiet zone measurement position, where A i，j A represents the amplitude correction value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the i-th starting quiet zone measurement position. i，j，n A represents the amplitude value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the i-th starting quiet zone measurement position when the measurement antenna is installed in the normal direction. i，j，t Indicates the amplitude value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the ith starting quiet zone measurement position when the tangentially installed measurement antenna steps forward;

[0122] The phase correction value of the received signal of the measuring antenna at each quiet zone measurement position is calculated according to the phase value of the received signal of the two orthogonal polarization components of the measuring antenna at each quiet zone measurement position and the angle difference between each quiet zone measurement position and the initial quiet zone measurement position, specifically comprising the following steps:

[0123] Use the phase value correction formula corresponding to the vertical polarization state

[0124] The phase value of the received signal of the measuring antenna at each quiet zone measurement position is corrected to obtain the phase correction value of the received signal of the measuring antenna at each quiet zone measurement position, where P i，j It represents the phase correction value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the i-th starting quiet zone measurement position, P i，j，n It represents the phase value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the i-th starting quiet zone measurement position when the measurement antenna is normally installed. i，j，t represents the phase value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the ith starting quiet zone measurement position of the tangentially mounted measurement antenna, ε(t) represents the step function, δ represents the preset angle step.

[0125] Specifically, for the sampled data with horizontal feed polarization:

[0126] The amplitude and phase sampling values ​​of the normal and tangential directions of the measurement antenna at the i-th installation position and the j-th angle are A and i，j，n , P i，j，n , A i，j，t , P i，j，t , 1≤i≤p-1, 0≤j≤q-1.

[0127] The correction method is:

[0128]

[0129] Where ε(t) represents the step function, All amplitude values ​​in the formula are calculated in linear units rather than dB units.

[0130] In an optional embodiment of the present invention, if the amplitude value and phase value of the received signal of the measuring antenna at each quiet zone measurement position are measurement data when the feed source is in a horizontal polarization state, and the quiet zone measurement position is the rotation center, the amplitude correction value of the received signal of the measuring antenna at each quiet zone measurement position is calculated according to the amplitude value of the received signal of the two orthogonal polarization components of the measuring antenna at each quiet zone measurement position, specifically including the following steps:

[0131] Use the rotation center amplitude value correction formula The amplitude value of the received signal of the measuring antenna at the rotation center is corrected to obtain the amplitude correction value of the received signal of the measuring antenna at the rotation center, wherein A0 represents the amplitude correction value of the received signal of the measuring antenna at the rotation center, and A 0，0，n A represents the amplitude of the received signal at the rotation center of the normally mounted measuring antenna. 0，90，n Indicates the amplitude value of the received signal at the rotation center of the tangentially mounted measuring antenna;

[0132] The phase correction value of the received signal of the measuring antenna at each quiet zone measurement position is calculated according to the phase value of the received signal of the two orthogonal polarization components of the measuring antenna at each quiet zone measurement position and the angle difference between each quiet zone measurement position and the initial quiet zone measurement position, specifically comprising the following steps:

[0133] The rotation center phase value correction formula P0=P corresponding to the horizontal polarization state is adopted 0，0，n The phase value of the received signal of the measuring antenna at the rotation center is corrected to obtain the phase correction value of the received signal of the measuring antenna at the rotation center, wherein P0 represents the phase correction value of the received signal of the measuring antenna at the rotation center, and P 0，0，n Indicates the phase value of the received signal at the rotation center of the normally mounted measurement antenna.

[0134] Specifically, for the sampled data with horizontal feed polarization:

[0135] For i = 0, that is, at the origin of the coordinate system, the correction method is:

[0136]

[0137] P0=P 0，0，n

[0138] So far, the data correction values ​​of all sampling points are obtained. In polar coordinate form, the sampling data correction value at the coordinate (i*λ / 8, j*δ) is A i，j and P i，j .

[0139] It should be noted that the above correction method needs to be based on some prerequisites, including but not limited to the good cross-polarization performance of the compact field measurement system, the good cross-polarization performance of the measurement antenna, and the equivalent rotation axis of the measurement antenna when changing polarization is coaxial with the antenna phase center. Otherwise, there will be errors in the results.

[0140] In addition, the specific method of correction is not limited to the above method, and other methods in the prior art may also be used.

[0141] In an optional embodiment of the present invention, the measuring antenna is mounted on a preset starting quiet zone measurement position on the table by a fixture.

[0142] Specifically, the measuring antenna is a single-polarized measuring antenna, and the fixture has a rotating mechanism. In addition, the measuring antenna can also be a dual-polarized measuring antenna. If it is a dual-polarized measuring antenna, different polarizations can be controlled by switching switches (no rotating mechanism is needed), thereby simplifying the measurement process.

[0143] The measurement antenna is a single-polarization measurement antenna. When measuring two orthogonal polarization components, the measurement antenna needs to be installed and measured in different directions. If the fixture of the measurement antenna has a rotation mechanism, the two polarization directions can be measured by rotating the fixture 90° at each measurement position. Then, the sampling of the two polarizations of the measurement antenna can be completed with only one installation; or, a dual-polarization measurement antenna can be used to measure the two polarization components at each measurement position. It is understandable that the link difference of the two polarizations needs to be compensated when correcting the results.

[0144] In an optional embodiment of the present invention, the compact range measurement system further comprises: a program-controlled linear moving device;

[0145] The fixture can be detachably mounted on the table through a program-controlled linear moving device, and the fixture can be moved along the radial direction of the table through the program-controlled linear moving device.

[0146] Specifically, the measuring antenna is mounted on the table of the turntable with a fixture (the table of the turntable can be provided with a corresponding positioning structure), and the fixture is manually installed in each installation position (i.e., the starting quiet zone measurement position) in sequence. Fig.11 The measuring antenna is installed on a programmable linear motion device that can be accurately positioned. The programmable linear motion device is detachably connected to the table of the turntable. The programmable linear motion device is set along the radial direction of the table of the turntable (i.e. along the Figure 6In this way, the measuring antenna can be automatically switched at each sampling starting point (i.e., the starting quiet zone measurement position) through program control.

[0147] It should be noted that the default turntable surface radius is at least greater than half of the quiet zone size, that is, the corresponding position of the turntable edge can cover the boundary of the quiet zone. If the turntable surface size is small and not enough to cover the quiet zone boundary, an extension device with better flatness can be installed on the turntable surface to expand the scanning range of the turntable rotation.

[0148] In addition, the above-mentioned turntable is a two-axis turntable. The number of rotation axes of the turntable in the present invention is not limited to this. It can also be a single axis or three axes, etc., as long as it has a rotation axis parallel to the direction of the plane wave of the reflection surface (that is, the table of the turntable is perpendicular to the direction of the wave); the default turntable table radius is at least greater than half of the quiet zone size, that is, the corresponding position of the turntable edge can cover the boundary of the quiet zone range. If the table size of the turntable is small and not enough to cover the boundary of the quiet zone, an extension device with better flatness can be installed on the table of the turntable to expand the scanning range of the turntable rotation.

[0149] The quiet zone amplitude and phase performance measurement method of the compact range measurement system of the present invention utilizes the turntable provided by the compact range measurement system to replace the scanning frame additionally set up in the traditional technology to perform quiet zone measurement, so as to improve the measurement accuracy. In the compact range measurement system, the relative position of the reflection surface and the turntable needs to be accurately debugged and calibrated to ensure that the rotation plane of the turntable is accurately located on the working plane designed by the system. The present method directly utilizes the turntable as a scanning device for quiet zone amplitude and phase measurement, and drives the measurement antenna to perform quiet zone performance sampling through the rotation of the turntable, so that quiet zone measurement can be achieved without using an external scanning frame. At the same time, since the measurement method is closer to the scene when the compact range measurement system is actually used, the measurement result can more intuitively reflect the quiet zone performance in the actual application scene, that is, it can ensure that the quiet zone measurement plane is consistent (or parallel) with the working plane of the compact range measurement system, thereby ensuring the accuracy of the quiet zone measurement and reducing the cost of the quiet zone measurement.

[0150] In addition, in the description of the embodiments of the present invention, 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 an indirect connection 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.

[0151] 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.

[0152] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for measuring the quiet zone amplitude and phase performance of a compact field measurement system, characterized in that: The compact range measurement system comprises: a feed source, a reflection surface, a turntable and a measuring instrument, wherein the table surface of the turntable is perpendicular to the incoming wave direction of the plane wave of the reflection surface, and the method comprises: After the installation and debugging of the compact range measurement system is completed, the measurement antenna is installed at a preset starting quiet zone measurement position on the table, and the table is controlled to step and rotate one circle so that the measurement antenna reaches each quiet zone measurement position, and then the amplitude value and phase value of the received signal of the measurement antenna at each quiet zone measurement position are measured by the measuring instrument, wherein the number of the starting quiet zone measurement positions is multiple; Correcting the amplitude value and phase value of the received signal of the measuring antenna at each of the quiet zone measurement positions to obtain the amplitude correction value and phase correction value of the received signal of the measuring antenna at each of the quiet zone measurement positions; The quiet zone amplitude and phase performance of the compact range measurement system is calculated according to the amplitude correction value and the phase correction value of the received signal of the measurement antenna at each quiet zone measurement position.

2. The method according to claim 1, characterized in that After the installation and debugging of the compact range measurement system is completed, the table is located at a preset measurement plane in the quiet zone, and the rotation center of the table is located on the central axis of the quiet zone.

3. The method according to claim 1, characterized in that The tabletop is controlled to rotate for one circle so that the measuring antenna reaches each quiet zone measuring position, including: The measuring antenna reaches each quiet zone measurement position by controlling the table to rotate one circle with a preset angle step, wherein the interval between two adjacent starting quiet zone measurement positions meets the preset standard requirements, and the distance between the starting quiet zone measurement position farthest from the rotation center and the rotation center is not less than half of the quiet zone size, and the preset angle step is not greater than 90 degrees.

4. The method according to claim 3, characterized in that The measuring antenna is installed at a preset starting quiet zone measuring position on the table, and the table is controlled to rotate step by step for one circle so that the measuring antenna reaches each quiet zone measuring position, including: The starting quiet zone measurement positions are traversed in sequence to perform the following measurements until all starting quiet zone measurement positions are traversed: Installing the measuring antenna along the normal direction at the starting quiet zone measuring position on the table, wherein the normal direction is the direction in which the polarization direction of the measuring antenna points to the rotation center; The table is controlled to rotate for one circle at a preset angle step so that the measuring antenna reaches each quiet zone measurement position on the measurement circumference corresponding to the starting quiet zone measurement position, and then the amplitude value and phase value of the received signal of the normally installed measuring antenna at each quiet zone measurement position on the measurement circumference corresponding to the starting quiet zone measurement position are measured by the measuring instrument; Installing the measuring antenna along a tangential direction at a starting quiet zone measuring position on the table, wherein the tangential direction is a direction orthogonal to the normal direction; The table is controlled to rotate one circle at a preset angle step so that the measuring antenna reaches each quiet zone measurement position on the measuring circle corresponding to the starting quiet zone measurement position, and then the amplitude value and phase value of the received signal of the tangentially installed measuring antenna at each quiet zone measurement position on the measuring circle corresponding to the starting quiet zone measurement position are measured by the measuring instrument.

5. The method according to claim 4, characterized in that The amplitude value of the received signal at each of the quiet zone measurement positions includes the amplitude value of the received signal of two orthogonal polarization components, and the phase value of the received signal at each of the quiet zone measurement positions includes the phase value of the received signal of two orthogonal polarization components. The amplitude value and the phase value of the received signal of the measuring antenna at each of the quiet zone measurement positions are corrected, including: Calculating an amplitude correction value of a received signal of the measuring antenna at each of the quiet zone measurement positions according to amplitude values ​​of received signals of two orthogonal polarization components of the measuring antenna at each of the quiet zone measurement positions; The phase correction value of the received signal of the measuring antenna at each of the quiet zone measurement positions is calculated according to the phase value of the received signal of the two orthogonal polarization components of the measuring antenna at each of the quiet zone measurement positions and the angle difference between each of the quiet zone measurement positions and the starting quiet zone measurement position.

6. The method according to claim 5, characterized in that If the amplitude value and phase value of the received signal of the measuring antenna at each of the quiet zone measurement positions are measurement data of the feed source in a vertical polarization state, and the quiet zone measurement position is not the rotation center, the amplitude correction value of the received signal of the measuring antenna at each of the quiet zone measurement positions is calculated according to the amplitude values ​​of the received signals of two orthogonal polarization components of the measuring antenna at each of the quiet zone measurement positions, including: Use the amplitude correction formula The amplitude value of the received signal of the measuring antenna at each of the quiet zone measurement positions is corrected to obtain the amplitude correction value of the received signal of the measuring antenna at each of the quiet zone measurement positions, wherein A i，j represents the amplitude correction value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps of the measuring antenna at the i-th starting quiet zone measurement position, A i，j，n A represents the amplitude value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the i-th starting quiet zone measurement position when the measurement antenna is installed in the normal direction. i，j，t Indicates the amplitude value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the ith starting quiet zone measurement position when the tangentially installed measurement antenna steps forward; Calculating a phase correction value of a received signal of the measuring antenna at each of the quiet zone measurement positions according to phase values ​​of received signals of two orthogonal polarization components of the measuring antenna at each of the quiet zone measurement positions and an angle difference between each of the quiet zone measurement positions and the starting quiet zone measurement position, comprising: Use the phase value correction formula corresponding to the vertical polarization state Correcting the phase value of the received signal of the measuring antenna at each of the quiet zone measurement positions to obtain the phase correction value of the received signal of the measuring antenna at each of the quiet zone measurement positions, wherein P i，j represents the phase correction value of the received signal of the quiet zone measurement position corresponding to the j preset angle steps of the measuring antenna at the i-th starting quiet zone measurement position, P i，j，n It represents the phase value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the i-th starting quiet zone measurement position when the measurement antenna is normally installed. i，j，t represents the phase value of the received signal at the quiet zone measurement position corresponding to the j-th preset angle step of the tangentially installed measurement antenna at the i-th starting quiet zone measurement position, ε(t) represents the step function, δ represents the preset angle step.

7. The method according to claim 5, characterized in that If the amplitude value and phase value of the received signal of the measuring antenna at each of the quiet zone measurement positions are measurement data of the feed source in a vertical polarization state, and the quiet zone measurement position is the rotation center, the amplitude correction value of the received signal of the measuring antenna at each of the quiet zone measurement positions is calculated according to the amplitude values ​​of the received signals of two orthogonal polarization components of the measuring antenna at each of the quiet zone measurement positions, including: Use the rotation center amplitude value correction formula The amplitude value of the received signal of the measuring antenna at the rotation center is corrected to obtain the amplitude correction value of the received signal of the measuring antenna at the rotation center, wherein A0 represents the amplitude correction value of the received signal of the measuring antenna at the rotation center, and A 0，0，n A represents the amplitude of the signal received by the normally mounted measuring antenna at the rotation center. 0，90，n represents the amplitude value of the received signal of the tangentially mounted measuring antenna at the said rotation center; Calculating a phase correction value of a received signal of the measuring antenna at each of the quiet zone measurement positions according to phase values ​​of received signals of two orthogonal polarization components of the measuring antenna at each of the quiet zone measurement positions and an angle difference between each of the quiet zone measurement positions and the starting quiet zone measurement position, comprising: The rotation center phase value correction formula P0=P corresponding to the vertical polarization state is adopted 0，90，n The phase value of the received signal of the measuring antenna at the rotation center is corrected to obtain the phase correction value of the received signal of the measuring antenna at the rotation center, wherein P0 represents the phase correction value of the received signal of the measuring antenna at the rotation center, and P 0，90，n It represents the phase value of the received signal of the tangentially mounted measuring antenna at the rotation center.

8. The method according to claim 5, characterized in that If the amplitude value and phase value of the received signal of the measuring antenna at each of the quiet zone measurement positions are measurement data of the feed source in a horizontal polarization state, and the quiet zone measurement position is not the rotation center, the amplitude correction value of the received signal of the measuring antenna at each of the quiet zone measurement positions is calculated according to the amplitude values ​​of the received signals of the two orthogonal polarization components of the measuring antenna at each of the quiet zone measurement positions, including: Use the amplitude correction formula The amplitude value of the received signal of the measuring antenna at each of the quiet zone measurement positions is corrected to obtain the amplitude correction value of the received signal of the measuring antenna at each of the quiet zone measurement positions, wherein A i，j represents the amplitude correction value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps of the measuring antenna at the i-th starting quiet zone measurement position, A i，j，n A represents the amplitude value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the i-th starting quiet zone measurement position when the measurement antenna is installed in the normal direction. i，j，t Indicates the amplitude value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the ith starting quiet zone measurement position when the tangentially installed measurement antenna steps forward; Calculating a phase correction value of a received signal of the measuring antenna at each of the quiet zone measurement positions according to phase values ​​of received signals of two orthogonal polarization components of the measuring antenna at each of the quiet zone measurement positions and an angle difference between each of the quiet zone measurement positions and the starting quiet zone measurement position, comprising: Use the phase value correction formula corresponding to the vertical polarization state Correcting the phase value of the received signal of the measuring antenna at each of the quiet zone measurement positions to obtain the phase correction value of the received signal of the measuring antenna at each of the quiet zone measurement positions, wherein P i，j represents the phase correction value of the received signal of the quiet zone measurement position corresponding to the j preset angle steps of the measuring antenna at the i-th starting quiet zone measurement position, P i，j，n It represents the phase value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the i-th starting quiet zone measurement position when the measurement antenna is normally installed. i，j，t represents the phase value of the received signal at the quiet zone measurement position corresponding to the j preset angle steps at the ith starting quiet zone measurement position of the tangentially mounted measurement antenna, ε(t) represents the step function, δ represents the preset angle step.

9. The method according to claim 5, characterized in that If the amplitude value and phase value of the received signal of the measuring antenna at each of the quiet zone measurement positions are measurement data of the feed source in a horizontal polarization state, and the quiet zone measurement position is the rotation center, the amplitude correction value of the received signal of the measuring antenna at each of the quiet zone measurement positions is calculated according to the amplitude values ​​of the received signals of two orthogonal polarization components of the measuring antenna at each of the quiet zone measurement positions, including: Use the rotation center amplitude value correction formula The amplitude value of the received signal of the measuring antenna at the rotation center is corrected to obtain the amplitude correction value of the received signal of the measuring antenna at the rotation center, wherein A0 represents the amplitude correction value of the received signal of the measuring antenna at the rotation center, and A 0，0，n A represents the amplitude of the signal received by the normally mounted measuring antenna at the rotation center. 0，90，n represents the amplitude value of the received signal of the tangentially mounted measuring antenna at the said rotation center; Calculating a phase correction value of a received signal of the measuring antenna at each of the quiet zone measurement positions according to phase values ​​of received signals of two orthogonal polarization components of the measuring antenna at each of the quiet zone measurement positions and an angle difference between each of the quiet zone measurement positions and the starting quiet zone measurement position, comprising: The rotation center phase value correction formula P0=P corresponding to the horizontal polarization state is adopted 0，0，n The phase value of the received signal of the measuring antenna at the rotation center is corrected to obtain the phase correction value of the received signal of the measuring antenna at the rotation center, wherein P0 represents the phase correction value of the received signal of the measuring antenna at the rotation center, and P 0，0，n It represents the phase value of the received signal of the normally mounted measuring antenna at the rotation center.

10. The method according to claim 4, characterized in that The measuring antenna is mounted on a preset starting quiet zone measuring position on the table through a fixture.

11. The method according to claim 10, characterized in that The measuring antenna is a single-polarized measuring antenna, and the fixture has a rotating mechanism.

12. The method according to claim 10, characterized in that The clamp is detachably mounted on the table top through a program-controlled linear moving device, and the clamp can be moved along the radial direction of the table top through the program-controlled linear moving device.

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