CN210604990U

CN210604990U - Antenna phase center calibration clamp

Info

Publication number: CN210604990U
Application number: CN201920321605.9U
Authority: CN
Inventors: 吉正飞; 张佳莺; 陈宇钦
Original assignee: Shanghai Em Testing Co ltd
Current assignee: Shanghai Em Testing Co ltd
Priority date: 2019-03-14
Filing date: 2019-03-14
Publication date: 2020-05-22
Anticipated expiration: 2029-03-14

Abstract

The utility model discloses an antenna phase center calibration fixture, which comprises an antenna fixing splint, a base, a lifting platform, a longitudinal driving device, a first horizontal driving device and a second horizontal driving device, wherein the base is fixedly arranged on a holding pole of an antenna testing system, the lifting platform is arranged on the base and can be lifted along the longitudinal direction, the longitudinal driving device drives the lifting platform to move, the antenna fixing splint is arranged on the lifting platform, the first horizontal driving device and the second horizontal driving device respectively drive the antenna fixing splint to move along the mutually vertical directions on the horizontal plane, and the antenna fixing splint is provided with an antenna mounting structure, thereby ensuring the accuracy of test data, being applicable to the test of various specifications and types of antennas, and the utility model has the advantages of convenient installation, convenient carrying, accurate calibration, simple and easy operation and low error, high precision and the like.

Description

Antenna phase center calibration clamp

Technical Field

The utility model relates to an antenna test field, in particular to antenna phase place center calibration anchor clamps.

Background

The phase center of the antenna has multiple purposes, and can be used for determining the center position of a feed antenna or a near-field probe, which plays a very important role in determining the feed position of the compact range system, because whether the feed is accurately positioned in the compact range system is directly related to the quiet zone index of the whole compact range system. The phase center can also be used for determining the variation of the phase center offset of the broadband feed source antenna or the near field probe along with the frequency; at present, a satellite navigation system with a navigation and positioning function mainly includes a GPS (Global positioning system), a GNSS (Global navigation satellite system) and a beidou navigation satellite in china, a galileo (galileo system in europe), and positioning and measurement are main functions of the satellite navigation system. The calibration of the phase center is critical to such high precision GNSS receiver antennas.

In the conventional testing technology for PCO and PCV in the prior art, an antenna is simply fixed on the center of a darkroom turntable, and the installation position of the antenna is determined by adopting a cross laser alignment mode, so that the antenna cannot be accurately adjusted, and only the offset of a phase center can be roughly estimated. In the xy direction, the movement between the x axis and the y axis is independent, and the y axis can be interfered to cause measurement errors when the movement is adjusted along the x axis. Due to different antenna shapes, positioning is difficult in the calibration process, and accurate calibration is difficult to achieve.

SUMMERY OF THE UTILITY MODEL

In order to compensate above not enough, the utility model provides an antenna phase place center calibration anchor clamps, this antenna phase place center calibration anchor clamps can adjust the three-dimensional position of antenna in the certain limit, ensures that it is located the centre of a circle of probe place circular arc line, guarantees that test data is accurate.

The utility model discloses a solve the technical scheme that its technical problem adopted and be: the utility model provides an antenna phase place center calibration anchor clamps, includes antenna mounting plate, base, lift platform, vertical drive arrangement, first horizontal drive arrangement and second horizontal drive arrangement, the base is by fixed mounting on antenna test system's armful pole, and lift platform is installed and can be followed vertical lift on the base, and vertical drive arrangement drives lift platform motion, and antenna mounting plate is installed on lift platform, and first horizontal drive arrangement and second horizontal drive arrangement drive antenna mounting plate respectively and follow mutually perpendicular's direction motion on the horizontal plane, have the antenna mounting structure on the antenna mounting plate.

When in use, the base is fixedly arranged on the holding pole of the antenna test system, the antenna is arranged in a mode of the threaded hole and the plastic screw, in addition, the base can also be fixed in a clamping mode, the antenna position is adjusted according to the arc center position of the probe of the antenna test system, the adjustment of any position of the antenna in a three-dimensional space in a certain range is realized by adjusting the height of the lifting platform and the positions of the antenna fixing clamping plates in two mutually vertical directions on a horizontal plane, the antenna is ensured to be always kept at the arc center position of the probe of the antenna test system in the test process, thereby ensuring the antenna test to be accurate and stable, and the adjusting structure can adjust the antenna according to the real-time position of the probe sliding on the track of the antenna test system, and the testing precision is ensured according to the adjustment of the actual position of the mounted antennas with different specifications and types.

As a further improvement, the longitudinal driving device comprises a longitudinal stud and a longitudinal nut, the longitudinal stud can be slidably mounted on the base in the circumferential direction locking and axial direction, the lifting platform is fixedly mounted at the upper end of the longitudinal stud, the longitudinal nut can be rotatably mounted on the base in the axial direction locking and circumferential direction, and the longitudinal nut and the longitudinal stud are movably connected in a threaded manner. The lifting along the longitudinal direction of the longitudinal stud is realized by rotating the longitudinal nut, and the stud does not rotate in the lifting process, so that the accuracy of the position and the placing direction on the horizontal plane of the antenna is ensured, the adjustment is convenient, wherein the longitudinal stud and the base can be connected through a matching structure of a longitudinal key and a key groove, or connected through a gear rack mode, a connecting structure with circumferential direction locking and axial direction capable of sliding relatively is realized, a longitudinal stud accommodating space with a certain height is formed on the base, the accommodation of the stud is realized, the base can adopt a ring column structure or a T-shaped ring structure and the like, and a hole position is arranged above the longitudinal stud and is connected with the lifting platform through a plastic screw.

As a further improvement, the vertical stud circumference outer side wall is provided with height scale marks arranged along the vertical interval. The distance of the antenna height adjustment can be conveniently observed and calculated by workers through the height scale marks, and the adjustment accuracy is guaranteed.

As a further improvement, the planar portion of an indent is arranged on the outer side wall of the circumference of the longitudinal stud, and the height scale mark is located on the planar portion. Set up the height scale sign through plane portion, make things convenient for setting up and observing of height scale sign, height scale sign can include scale mark, digit etc..

As a further improvement, still be equipped with one on the vertical nut lateral wall along the positioning thread hole of radial extension, this positioning thread downthehole activity threaded connection has a set screw, the set screw tip can tightly support vertical double-screw bolt circumference outside on the surface. The height position of the longitudinal stud is fixed and positioned through the positioning screw, and the height of the longitudinal stud is prevented from changing under the action of external force.

As a further improvement, two mutually perpendicular directions established on the horizontal plane are the X direction and the Y direction respectively, first horizontal drive includes a pair of first slider and a pair of first screw rod along X direction relative slip, and first screw rod threaded connection is on elevating platform, and first screw rod and the movable axial locking of first slider and circumferencial direction can the pivoted be connected, second horizontal drive includes a pair of second slider and a pair of second screw rod along Y direction relative slip, and second screw rod threaded connection is on elevating platform, and the second screw rod can the pivoted with second slider axial locking and circumferencial direction be connected, antenna mounting plate just can be located between first slider and the second slider by the fixation clamp.

The antenna fixing clamping plate is clamped and fixed through the paired first sliding block and second sliding block to realize the fixing and positioning of the antenna fixing clamping plate, when the position of the antenna fixing clamping plate needs to be adjusted, only the first screw rod and the second screw rod need to be adjusted to drive the first sliding block and the second sliding block to slide, and further the position of the antenna fixing clamping plate along the X direction and the position of the antenna fixing clamping plate along the Y direction are changed, besides the structure, the antenna fixing clamping plate can also be realized through an X-direction sliding block arranged on a lifting platform and a Y-direction sliding block arranged on the X-direction sliding block, the position of the antenna fixing clamping plate along the X direction and the position of the antenna fixing clamping plate along the Y direction can be changed through the sliding of the X-direction sliding block along the X direction and the sliding of the Y-direction sliding block along the Y direction, or the antenna fixing clamping plate can be realized through the structural matching of, the center of the cross structure is provided with a cross groove, the first sliding block and the second sliding block can be embedded into the cross groove in a sliding mode, the first sliding block and the second sliding block are optimally made of plastic clamping blocks and placed in four directions, the antenna fixing clamping plates are square in shape, and the antenna fixing clamping plates in other shapes can be configured according to different types of the antennas to be tested.

As a further improvement, the first slider and the second slider are close to antenna mounting plate one side and form L shape and step up the end, and antenna mounting plate edge all around can just insert locate first, two sliders in the U-shaped opening slot that forms between the side surface on the lift platform. The four side edges of the antenna fixing clamping plate are clamped and positioned through the L-shaped clamping end, so that the antenna fixing clamping plate is prevented from being separated from the lifting platform, and the accuracy of the antenna adjusting position is ensured.

As a further improvement, the lifting platform upside is equipped with the first horizontal scale sign that corresponds with each first slider on the surface, and the lifting platform upside still is equipped with the second horizontal scale sign that corresponds with each second slider on the surface. The adjusting distances of the antenna in the X direction and the Y direction are displayed through the first horizontal scale mark and the second horizontal scale mark, so that the antenna is convenient to observe and calculate and is used for calibrating the moving distance of the antenna in the test system.

As a further improvement of the utility model, the structure that the base can fixed mounting on antenna test system's armful pole does, is equipped with two at least rectangular arc holes on the base, and antenna test system's armful pole upside is equipped with the screw hole that corresponds with it on the surface, still is equipped with connecting screw, and connecting screw inserts and locates in the rectangular arc hole and finally with the screw hole on the armful pole and be connected. Through rectangular arc hole with the pedestal mounting on antenna test system's armful pole, the installation of being convenient for can adjust convenient to use in certain rotation range.

As the utility model discloses a further improvement still is equipped with the correction computing system, and this correction computing system and test system's data output module electronic communication, this correction computing system can input the moving distance of antenna along mutually perpendicular's three direction, and the correction computing system can be according to the moving distance of test antenna along three direction and test system's test data calculation antenna phase place center offset. The offset of the antenna phase center is calculated by the correction calculation system, so that the antennas of various types and specifications can be conveniently and rapidly and accurately installed and position corrected, and the installation position of the antennas is ensured to be the center of the test system.

The clamp is made of nonmetal materials, so that the influence of electromagnetic scattering of the metal sliding table or the metal structural member on a test result is avoided.

The utility model has the beneficial technical effects that: the utility model discloses an install the base on embracing the pole of antenna test system, set up lift platform on the base, and set up the antenna fixation splint that can follow the motion of mutually perpendicular direction on the horizontal plane on lift platform, and then adjust the antenna position wantonly in certain three-dimensional space, make its probe that is located antenna test system on the circular arc line central point, and the removal between the triaxial is mutually independent, the measuring error that mutual interference leads to when having avoided removing, it is accurate to guarantee test data, and simultaneously, can be applicable to the test of various specifications and type antenna, just the utility model discloses confidence simple to operate, portable just marks the accuracy, and the operation is simple and easy, and the error is low, advantages such as precision height.

Drawings

FIG. 1 is a front view of the structure principle of the present invention;

FIG. 2 is a schematic top view of the structure of the present invention;

fig. 3 is a schematic view of the usage state of the present invention.

Detailed Description

Example (b): an antenna phase center calibration clamp comprises a cross-shaped lifting platform 2 with scales, a longitudinal stud 3 with scales, a base 5, a longitudinal nut 4, an antenna fixing clamp plate 1, a first sliding block 8 and a second sliding block 10, wherein the cross-shaped lifting platform 2 with scales is used for adjusting the position of a measured antenna along the xy direction (two mutually perpendicular directions on a horizontal plane) of a test coordinate system, the longitudinal stud 3 with scales is used for adjusting the height of the measured antenna along the z direction of the coordinate system, the base 5 is used for connecting the clamp with a holding rod of the test system, the longitudinal nut 4 is used for driving the longitudinal stud 3 to ascend and descend, the antenna fixing clamp plate 1 is used for mounting the measured antenna, and the first sliding block 8 and the second sliding block 10 are used for clamping the antenna fixing clamp plate; the center of the cross-shaped lifting platform 2 is provided with a cross groove, a first sliding block 8 and a second sliding block 10 which are used for fixing the antenna fixing splint 1 are embedded in the groove in a sliding manner, the first sliding block 8 and the second sliding block 10 are made of plastic materials, a first fixing clamping block and a second fixing clamping block are respectively embedded in the groove in a fixed manner, the first fixing clamping block and the second fixing clamping block are fixed on the cross-shaped plastic lifting platform 2 with a first horizontal scale mark 12 and a second horizontal scale mark 13 by using first and

second screw rods

9 and 11 of plastic, the first and

second screw rods

9 and 11 of the plastic can rotate to penetrate through the first fixing clamping block and the second fixing clamping block to be reserved with thread holes per se to connect the first sliding block 8 and the second sliding block 10, the first sliding block 8, the second sliding block 10, the first fixing clamping block 15 and the second fixing clamping block 16 are respectively provided with one in the cross direction, and can be used for fixing the antenna fixing splint 1 with various shapes, the edges of the grooves are provided with standard scale marks for accurately moving the antenna to be tested clamped above the clamp when the phase center of the antenna in the test system is calibrated; the hole site with the top of the longitudinal stud 3 with the scale is connected with the lifting platform 2 through a plastic screw and is rotationally connected with the internal thread of the longitudinal nut 4 on the base 5 through the external thread of the hole site, the external thread is arranged on the outer surface of the whole longitudinal stud 3, the height scale mark 6 is arranged on the longitudinal stud 3 in the vertical direction, and the height scale mark 6 is a shallow groove marked with accurate scale; the vertical nut 4 that can rotate the setting on base 5 is cylindricly, and the top has the indent screw thread mouth to be used for linking to each other with vertical double-screw bolt 3 of taking the scale, and the side has the indent screw thread mouth to fix the relative position of vertical double-screw bolt 3 through rotatory plastics set screw 7, and the base 5 lower extreme has the reservation hole site to be used for connecting the revolving stage armful pole among the fixed test system.

The operation method flow during the test is as follows:

(1) the test fixture is arranged on the holding pole of the azimuth turntable of the multi-probe antenna test system, so that the fixture base 5 and the holding pole flange are concentric, and the azimuth axis is consistent in zero direction. The antenna reference point is positioned at the center of a circle of the multi-probe spherical near-field antenna test system in the darkroom, and the translation amount of the triaxial moving mechanism of the test fixture is calibrated or recorded as an initial value.

(2) And carrying out phase center test on the antenna to be tested to obtain an initial test value, adjusting the translation amount of an xyz shaft on the clamp according to the test value to ensure that the phase center of the antenna is as close to the center of the multi-probe spherical near-field antenna test system as possible, retesting the phase center of the antenna again, and adjusting the distance between the measured phase center and the center of the multi-probe spherical near-field antenna test system to be as small as possible through multiple displacement adjustments.

(3) Recording the translation amount of the three-axis moving mechanism of the test fixture as an adjustment final value, wherein the difference value between the adjustment final value and the initial value of the three axes is the deviation value of the antenna phase center relative to the antenna reference point, and calculating the accurate antenna phase center deviation amount.

Claims

1. An antenna phase center calibration jig characterized by: including antenna solid fixed splint (1), base (5), lift platform (2), vertical drive arrangement, first horizontal drive arrangement and second horizontal drive arrangement, the base is by fixed mounting on antenna test system's armful pole, and lift platform is installed and can be followed vertical lift on the base, and vertical drive arrangement drives lift platform motion, and antenna solid fixed splint are installed on lift platform, and first horizontal drive arrangement and second horizontal drive arrangement drive antenna solid fixed splint respectively and move along mutually perpendicular's direction on the horizontal plane, have the antenna mounting structure on the antenna solid fixed splint.

2. The antenna phase center calibration jig according to claim 1, characterized in that: the longitudinal driving device comprises a longitudinal stud (3) and a longitudinal nut (4), the longitudinal stud is mounted on the base in a locking and axially sliding mode in the circumferential direction, the lifting platform is fixedly mounted at the upper end of the longitudinal stud, the longitudinal nut is mounted on the base in a locking and axially rotating mode in the circumferential direction, and the longitudinal nut is movably connected with the longitudinal stud in a threaded mode.

3. The antenna phase center calibration jig according to claim 2, characterized in that: and the outer side wall of the circumference of the longitudinal stud is also provided with height scale marks (6) which are arranged at intervals along the longitudinal direction.

4. The antenna phase center calibration jig according to claim 3, characterized in that: and an inwards concave plane part is arranged on the outer side wall of the circumference of the longitudinal stud, and the height scale mark is positioned on the plane.

5. The antenna phase center calibration jig according to claim 4, characterized in that: the side wall of the longitudinal nut is also provided with a positioning threaded hole extending along the radial direction, a positioning screw (7) is movably connected in the positioning threaded hole in a threaded manner, and the end part of the positioning screw can be tightly abutted to the outer side surface of the circumference of the longitudinal stud.

6. The antenna phase center calibration jig according to claim 1, characterized in that: the two mutually perpendicular directions arranged on the horizontal plane are respectively the X direction and the Y direction, the first horizontal driving device comprises a pair of first sliding blocks (8) and a pair of first screw rods (9) which slide relatively along the X direction, the first screw rods are in threaded connection with the lifting platform, the first screw rods are in movable axial stopping and circumferential rotatable connection with the first sliding blocks, the second horizontal driving device comprises a pair of second sliding blocks (10) and a pair of second screw rods (11) which slide relatively along the Y direction, the second screw rods are in threaded connection with the lifting platform, the second screw rods are in axial stopping and circumferential rotatable connection with the second sliding blocks, and the antenna fixing clamp plate can be just fixedly clamped between the first sliding blocks and the second sliding blocks.

7. The antenna phase center calibration jig according to claim 6, wherein: the first sliding block and the second sliding block are close to one side of the antenna fixing clamping plate to form an L-shaped clamping end, and the peripheral edge of the antenna fixing clamping plate can be just inserted into a U-shaped opening slot formed between the upper side surfaces of the first sliding block and the second sliding block on the lifting platform.

8. The antenna phase center calibration jig according to claim 6, wherein: the lifting platform is characterized in that first horizontal scale marks (12) corresponding to the first sliding blocks are arranged on the surface of the upper side of the lifting platform, and second horizontal scale marks (13) corresponding to the second sliding blocks are further arranged on the surface of the upper side of the lifting platform.

9. The antenna phase center calibration jig according to claim 1, characterized in that: the structure that the base can fixed mounting on antenna test system's armful pole does, is equipped with two at least rectangular arc holes (14) on the base, and antenna test system's armful pole upside is equipped with the screw hole that corresponds with it on the surface, still is equipped with connecting screw, and connecting screw inserts and locates in the rectangular arc hole and finally with the screw hole on the armful pole be connected.

10. The antenna phase center calibration jig according to claim 1, characterized in that: the calibration calculation system can input the movement distances of the antenna along three mutually perpendicular directions and can calculate the offset of the phase center of the antenna according to the movement distances of the test antenna along the three directions and the test data of the test system.