CN210665891U

CN210665891U - Shielding-free antenna test system

Info

Publication number: CN210665891U
Application number: CN201921555914.9U
Authority: CN
Inventors: 谭启仁
Original assignee: Liwei Technology (shenzhen) Co Ltd
Current assignee: Liwei Technology (shenzhen) Co Ltd
Priority date: 2019-09-19
Filing date: 2019-09-19
Publication date: 2020-06-02
Anticipated expiration: 2029-09-19

Abstract

The utility model discloses a non-shielding antenna test system, which comprises a base, wherein a moving mechanism is arranged on the base, and a rotating holder is arranged above the moving mechanism; the rotating holder comprises a swinging seat and a base which are respectively arranged up and down, the base is connected with the moving mechanism, and the swinging seat is connected with the base through a pitching shaft driving device; the swinging seat is provided with a tested antenna installation part. The utility model provides a do not have antenna test system that shelters from makes the antenna under test do not have completely in testing environment and shelters from, and the antenna under test can fully receive the environmental simulation signal who comes from its the place ahead each direction, does not have the problem that the signal loses.

Description

Shielding-free antenna test system

Technical Field

The utility model relates to an antenna test field especially relates to a do not have antenna test system that shelters from.

Background

In the field of microwave testing, when testing needs to be performed under a simulated required electromagnetic environment, particularly for testing a navigation antenna, one or a plurality of transmitting antennas are generally arranged around a testing system to simulate the required electromagnetic environment characteristics for matching testing. The test system is placed in a test environment and is responsible for driving the antenna to be tested to move according to a set track in the test environment, and meanwhile, the test system controls the instrument to collect data to complete the test.

The main body part of the test system is a multi-axis motion mechanism and a control system thereof which are specially used for carrying the antenna to be tested, and the motion parameter performance of the test system meets the motion requirement of the antenna test; the test system also includes one or more transmitting antennas to create or simulate the electromagnetic environment required for the test. The multi-axis motion mechanism mainly comprises a control system and a multi-axis motion mechanism. When testing is carried out, one or a plurality of transmitting antennas start to work to generate a required electromagnetic environment according to the requirement; the multi-axis movement mechanism moves according to the planned test, the tested antenna is arranged on the multi-axis movement mechanism, the tested antenna is driven to move according to the planned movement track, and the control system simultaneously acquires data to complete the test.

However, the existing antenna test system has the following defects: 1) the transmitting antenna positioned behind the multi-axis movement mechanism is shielded by the multi-axis movement mechanism, so that the detected antenna cannot receive the shielded transmitting antenna signal, the transmitting antenna signal is lost, and the test result is distorted; 2) part of the multi-axis motion mechanism is higher than the installation surface of the antenna to be tested, and adverse effects such as reflection and the like are generated in a test environment, so that the simulation environment is distorted, and the test result is distorted.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a do not have antenna test system that shelters from makes the antenna under test do not have completely in testing environment and shelters from, and the antenna under test can fully receive the environmental simulation signal that comes from its the place ahead each side, does not have the problem of signal loss.

In order to achieve the above object, the utility model provides a non-shielding antenna test system, which comprises a base, wherein a moving mechanism is arranged on the base, and a rotating holder is arranged above the moving mechanism; the rotating holder comprises a swinging seat and a base which are respectively arranged up and down, the base is connected with the moving mechanism, and the swinging seat is connected with the base through a pitching shaft driving device; the swinging seat is provided with a tested antenna installation part.

As a further improvement of the present invention, the moving mechanism includes a traversing mechanism and a lifting mechanism connected to each other, and the moving directions of the traversing mechanism and the lifting mechanism constitute a testing plane.

As a further improvement of the present invention, the test plane is arranged vertically, and the swing axis of the swing seat is arranged horizontally.

As a further improvement of the utility model, the swing axis of the swing seat is perpendicular to the test plane, and the rotation axis of the tested antenna installation part is parallel to or coincided with the test plane.

As a further improvement of the utility model, the top of the base is provided with a wave-absorbing structure; the wave-absorbing structure is positioned below the rotating holder, and the base and the moving mechanism are positioned below the wave-absorbing structure.

As a further improvement, the swinging seat is connected with the tested antenna installation part through a polarization shaft rotating device.

As a further improvement of the present invention, the traversing mechanism comprises a first linear driving mechanism, a first sliding block and a first sliding rail which are connected with each other in a sliding manner; the first sliding rail is arranged on the base; the first linear driving mechanism is connected between the first sliding block and the base.

As a further improvement of the present invention, the lifting mechanism comprises a second linear driving mechanism, a second slider and a second slide rail which are slidably connected to each other; the second sliding rail is fixedly connected with the first sliding block, and the second sliding block is connected with the rotating holder through a support column; the second linear driving mechanism is connected between the first sliding block and the second sliding block.

Advantageous effects

Compared with the prior art, the utility model discloses a do not have antenna test system that shelters from's advantage does:

1. the tested antenna moves under the cooperative work of the moving mechanism and the rotating holder, the moving path of the tested antenna can simulate the receiving condition of the tested antenna on signals in all directions under the actual use environment, meanwhile, the moving mechanism and the rotating holder are both positioned behind or below the tested antenna, the tested antenna is completely free of shielding in the test environment, the tested antenna can fully receive the environment simulation signals from all directions in front of the tested antenna, and the problem of signal loss does not exist. In a microwave test, particularly a navigation antenna test, a transmitting antenna signal is not shielded and lost, an electromagnetic environment is complete and is not interfered, and the true electrical performance index of the antenna to be tested can be tested.

2. The moving mechanism and the rotating holder are both positioned below the antenna to be measured, the swinging axis of the rotating holder swinging seat moves along an arc track, and the axis of the arc track is an equivalent El shaft. The phase center of the measured antenna is always coincident with the equivalent El axis in the motion process. The moving mechanism and the rotating holder keep a certain distance with the center of the circular arc track, and the upper surface of the moving mechanism is provided with a wave absorbing structure to carry out electromagnetic absorption on incident signals. The energy of a primary signal reaching the test area after the electromagnetic wave is reflected is weak, the multipath effect generated by the structure in the test area is not obvious, and the precision requirement of the antenna performance test can be effectively ensured.

The invention will become more apparent from the following description when taken in conjunction with the accompanying drawings which illustrate embodiments of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a perspective view of an unobstructed antenna test system;

FIG. 2 is a second schematic perspective view of the unobstructed antenna test system;

FIG. 3 is an enlarged schematic view of the rotational head;

FIG. 4 is an enlarged schematic view of the moving mechanism;

FIG. 5 is a third schematic perspective view of the unobstructed antenna testing system;

fig. 6 is a side view of an unobstructed antenna test system.

Detailed Description

Embodiments of the present invention will now be described with reference to the accompanying drawings.

Examples

The utility model discloses a concrete implementation mode is as shown in fig. 1 to fig. 6, a do not have antenna test system that shelters from, including base 1, be equipped with moving mechanism on the base 1, moving mechanism's top is equipped with rotates cloud platform 4. The rotating head 4 includes a swing seat 42 and a base 41 respectively arranged up and down, the base 41 is connected with the moving mechanism, and the swing seat 42 is connected with the base 41 through a pitch axis driving device 43. The swinging base 42 is connected to a measured antenna mounting portion 45 through a polarization axis rotating device 44. The antenna mounting portion 45 to be measured has a flange structure.

The mounting portion 45 has a disk shape. The polarization axis rotating device 44 is connected to one side of a disk-shaped mounting portion 45, and the other side of the disk-shaped mounting portion 45 is a mounting surface of the antenna to be measured.

When the technical scheme is implemented, the vertical layout is adopted, namely in a test environment, the transmitting antenna is arranged above the test environment, points to the ground and transmits test electromagnetic waves along the vertical direction. The moving mechanism is horizontally arranged and arranged below the transmitting antenna, and the antenna to be measured is arranged on the rotating holder 2 through a tool and is just opposite to the transmitting antenna. Planning the motion track of the antenna to be tested according to the test requirement, driving the rotating holder 2 and the antenna to be tested to move along the planned track by the moving mechanism, and synchronously acquiring data by the control system to finish the test.

The moving mechanism comprises a transverse moving mechanism 2 and a lifting mechanism 3 which are connected. The moving direction of the traverse mechanism 2 is an X-axis, and the moving direction of the lifting mechanism 3 is a Z-axis. The moving directions of both the traverse mechanism 2 and the elevating mechanism 3 constitute a test plane. The Z axis is parallel to the main direction of the test electromagnetic wave, and the X axis is perpendicular to the main direction of the test electromagnetic wave and is orthogonal to the Z axis. The test plane coincides with or is parallel to the main direction of the test electromagnetic wave.

The test planes are arranged vertically. The swing axis of the swing seat 42 is a pitch axis El, and the pitch axis El is horizontally arranged. The pitch axis El is perpendicular to the test plane. The axis of rotation of the antenna mount 45 under test is the polarization axis Pol, which is parallel to or coincides with the test plane. The movable seat 42 can rotate in a pitching mode within a given range and even rotate infinitely; the antenna mounting portion 45 is driven by the polarization axis Pol and can be rotated.

The rotating holder 4 can reach any position in the test plane under the driving of the moving mechanism, and the motion track required by the test, such as an arc track, is realized. When the motion track is a circular arc track, the circular arc track has an equivalent axis: equivalent El axis. At the moment, the phase center of the antenna to be tested is always superposed with the equivalent El axis in the motion process, and the control system synchronously acquires data to finish the test.

The top of the base 1 is provided with a wave-absorbing structure 6. The wave-absorbing structure 6 is positioned below the rotating holder 4, and the base 1 and the moving mechanism are positioned below the wave-absorbing structure 6. In this embodiment, the wave-absorbing structure 6 is a triangular body with an upward top end. The base 1 is provided with a supporting seat 5, and the wave-absorbing structure 6 is paved on the supporting seat 5.

The traversing mechanism 2 comprises a first linear driving mechanism, a first slide block 21 and a first slide rail 22 which are mutually connected in a sliding way. The first slide rail 22 is mounted on the base 1. The first linear drive mechanism is connected between the first slider 21 and the base 1. In this embodiment, the first linear drive mechanism includes a first motor, a first gear 23, and a first rack. The first motor is arranged on the first sliding block 21, the first gear 23 is connected to the output end of the first motor, and the base 1 is provided with a first rack (not shown in the figure) which is meshed with the first gear 23. By driving the first gear 23 by the first motor, the first slider 21 can be moved in the X-axis direction, and the antenna to be measured can be moved in the X-axis direction.

The lifting mechanism 3 comprises a second linear driving mechanism, a second sliding block and a second sliding rail 31 which are connected with each other in a sliding manner. The second slide rail 31 is fixedly connected with the first slide block 21, and the second slide block is connected with the rotating holder 4 through the support column 7. The second linear drive mechanism is connected between the first slider 21 and the second slider. In this embodiment, the second linear drive mechanism includes a second motor, a second gear, and a second rack 32. The second motor is arranged on the second sliding block, the second gear is connected with the output end of the second motor, the second rack 32 is fixedly connected with the second sliding rail 31, and the second gear is meshed with the second rack 32. The second gear is driven by the second motor, so that the second sliding block moves along the Z-axis direction, and the antenna to be measured moves along the Z-axis direction.

In addition to the above embodiments, the Z axis may be parallel to the main direction of the test electromagnetic wave, and the X axis is perpendicular to the Z axis but not perpendicular, i.e. the Z axis forms an angle with the X axis. Through the combination of the two linear motions in the crossed layout, a test plane can be formed, and the test plane is coincident with or parallel to the main direction of the test electromagnetic wave. The rotating cloud deck 4 is installed at the tail end of the moving mechanism, and can reach any position in a test plane through automatic control, so that the motion track required by the test is realized.

Furthermore, the rotating head may also be a 3-axis rotating head, i.e. consisting of a pitch axis El axis, an azimuth axis Az axis, and a polarization axis Pol axis. The azimuth axis Az axis is coincident with or parallel to the Z axis, and may be rotated, for example, a rotation driving device is provided between the pillar 7 and the base 41, so that the base 41 can axially rotate around the azimuth axis Az axis. The elevation axis El is perpendicular to the plane formed by the Z axis and the X axis, and can rotate in elevation or even rotate in revolution within a given range. The tested antenna mounting part 45 is driven by the polarization axis Pol and can be rotated. Through automatic control, when the antenna to be detected performs circular motion, the pitching angle synchronously rotates along with the rotation, and the antenna is kept pointing to the center of the circular arc all the time.

In the moving mechanism described in the above embodiment, the linear moving portion may be a screw transmission combination, a guide rail and a rack-and-pinion transmission combination, a linear motor, or pneumatic or hydraulic transmission. Various prior art equivalents or combinations thereof do not affect implementation of the present technology.

The rotating tripod head 2 related to the above embodiments may be directly driven by a motor to rotate, may also be driven by a motor to rotate a multi-axis moving mechanism, may also be driven by a motor to rotate a speed changing mechanism, may also be a combination of an arc track and a sector rack and pinion to rotate, and may also be a combination of an arc motor to rotate.

When the transmitting antenna is one, the tested antenna can be tested for directional diagram, gain, cross-planning isolation and the like. When the transmitting antennas are in a plurality of layouts, the satellite navigation environment can be simulated, and the tested antenna can be used for performing navigation receiving characteristic test. One or more transmitting antennas are adopted, and the implementation of the technical scheme is not influenced if a 3-axis rotating cradle head is adopted. The vertical layout is entirely inverted to the horizontal layout, or equivalent substitutions obvious in the prior art will not affect the implementation of the present technical solution.

Further, the polarization axis rotating device 44 may not be provided, and the antenna-to-be-measured attachment portion 45 may be directly and fixedly connected to the swinging base 42.

The present invention has been described above with reference to the preferred embodiments, but the present invention is not limited to the above-disclosed embodiments, and various modifications, equivalent combinations, which are made according to the essence of the present invention, should be covered.

Claims

1. A non-shielding antenna test system comprises a base (1), and is characterized in that a moving mechanism is arranged on the base (1), and a rotating holder (4) is arranged above the moving mechanism; the rotating cloud deck (4) comprises a swinging seat (42) and a base (41) which are respectively arranged up and down, the base (41) is connected with a moving mechanism, and the swinging seat (42) is connected with the base (41) through a pitching shaft driving device (43); the swing seat (42) is provided with a tested antenna mounting part (45).

2. The unshielded antenna test system according to claim 1, wherein the moving mechanism comprises a traversing mechanism (2) and a lifting mechanism (3) which are connected, and the moving directions of the traversing mechanism (2) and the lifting mechanism (3) form a test plane.

3. Unobstructed antenna test system according to claim 2, characterized in that said test plane is arranged vertically and the axis of oscillation of said oscillating seat (42) is arranged horizontally.

4. An unobstructed antenna test system as claimed in claim 2 or 3, wherein said oscillation base (42) has an axis of oscillation perpendicular to the test plane and said axis of rotation of the antenna mounting (45) under test is parallel to or coincident with said test plane.

5. The unshielded antenna test system according to claim 1, characterized in that the wave absorbing structure (6) is arranged on the top of the base (1); the wave-absorbing structure (6) is positioned below the rotating holder (4), and the base (1) and the moving mechanism are positioned below the wave-absorbing structure (6).

6. The unshielded antenna test system according to claim 1, wherein the swinging seat (42) is connected with the tested antenna mounting part (45) through a polarization axis rotating device (44).

7. The unshielded antenna test system according to claim 2, wherein said traversing mechanism (2) comprises a first linear driving mechanism, a first slide block (21) and a first slide rail (22) slidably connected to each other; the first sliding rail (22) is arranged on the base (1); the first linear driving mechanism is connected between the first sliding block (21) and the base (1).

8. The unobstructed antenna test system of claim 7, wherein said elevating mechanism (3) comprises a second linear driving mechanism, a second slider and a second slide rail (31) slidably connected to each other; the second sliding rail (31) is fixedly connected with the first sliding block (21), and the second sliding block is connected with the rotating holder (4) through a support column (7); the second linear driving mechanism is connected between the first slider (21) and the second slider.