Weather radar antenna far-field test system

Abstract

The utility model discloses a weather radar antenna far-field test system, which comprises a test tower, a first three-axis turntable, a source antenna, a signal source, a radar tower, a two-axis turntable, an antenna to be tested, a standard gain antenna, a second three-axis turntable, a lifting platform and a spectrum analyzer, the spectrum analyzer is electrically connected with the to-be-tested antenna and the standard gain antenna in a time-sharing manner; the first three-axis rotary table is arranged on the test tower, the source antenna is arranged on the first three-axis rotary table, the two-axis rotary table is arranged on the radar tower, the antenna to be tested is arranged on the two-axis rotary table, the second three-axis rotary table is installed on the lifting table, and the standard gain antenna is installed on the second three-axis rotary table. In the embodiment of the invention, the polarization position of the source antenna can be matched and aligned with the polarization position of the to-be-tested antenna, and the to-be-tested antennas at different positions and different heights can be accurately aligned with the source antenna by bidirectionally adjusting the pitching positions and the azimuth positions of the source antenna and the to-be-tested antenna.

Description

TECHNICAL FIELD

[0001] The utility model relates to antenna test technical field especially relates to a weather radar antenna far field test system. BACKGROUND

[0002] The performance of weather radar antenna influences the detection ability of radar system, one of the test modes of the performance of weather radar antenna is outdoor far field test, and the outdoor far field test is closer to the actual working condition of antenna. The outdoor far field test system of weather radar antenna is mainly used for testing the radiation pattern, beam width, sidelobe level, polarization isolation, gain and the like of the antenna to be tested.

[0003] In the related art, the outdoor far field test system comprises a transmitting antenna, an antenna to be tested, a gain horn antenna and the like, the antenna to be tested is installed on a rotary table, and the polarization of the antenna to be tested is fixed. During the test, the antenna to be tested is aligned with the transmitting antenna by adjusting the azimuth position and the elevation position.

[0004] However, since the polarization of the antenna to be tested is fixed after installation, the polarization of the transmitting antenna and the antenna to be tested is difficult to match. In addition, for the test scene where the antennas to be tested are distributed at multiple points and have different heights, it is difficult to ensure the accurate alignment of different antennas to be tested and the transmitting antenna. In addition, the height of the gain horn antenna cannot be adjusted during the test, and the gain measurement of the antenna to be tested is easily affected by the multipath of the surrounding environment. SUMMARY

[0005] The utility model provides a weather radar antenna far field test system, aims at at least solve the problem that the test system is difficult to polarize matching and position accurate alignment in prior art, reduce the influence of environmental multipath interference.

[0006] The utility model embodiment provides a weather radar antenna far field test system, including test tower, first three -axis rotary table, source antenna, signal source, radar tower, two -axis rotary table, antenna to be tested, standard gain antenna, second three -axis rotary table, lifting platform and spectrum analyzer, the source antenna is connected with signal source electricity, the spectrum analyzer is connected with antenna to be tested and standard gain antenna electricity in time sharing;

[0007] The first three -axis rotary table is arranged on the test tower, the source antenna is arranged on the first three -axis rotary table, the two -axis rotary table is arranged on the radar tower, the antenna to be tested is arranged on the two -axis rotary table, the second three -axis rotary table is installed on the lifting platform, and the standard gain antenna is installed on the second three -axis rotary table;

[0008] The first three-axis turntable comprises a rotatable first tilt axis, a first azimuth axis and a first polarization axis, the two-axis turntable comprises a rotatable second tilt axis and a second azimuth axis, and the second three-axis turntable comprises a rotatable third tilt axis, a third azimuth axis and a third polarization axis.

[0009] Optionally, the test tower further comprises a first switch, a second switch and a measured antenna end industrial computer, the first switch is connected with the signal source network, the first switch is connected with the second switch through a network, the spectrum analyzer is connected with the second switch through a network, and the second switch is connected with the measured antenna end industrial computer through a network.

[0010] Optionally, the test tower further comprises a shelter and a device table, the shelter is arranged on the test tower, the device table is located in the shelter, the signal source and the first switch are arranged on the device table and located in the shelter, and the first three-axis turntable and the source antenna are located outside the shelter and above the shelter.

[0011] Optionally, the test tower further comprises a hard disk recorder and a plurality of monitoring cameras, and the plurality of monitoring cameras are connected with the hard disk recorder through a network.

[0012] At least one monitoring camera is arranged in the shelter, at least one monitoring camera is arranged outside the shelter, and the plurality of monitoring cameras are connected with the first switch through a network.

[0013] Optionally, the test tower further comprises a source antenna end industrial computer, the source antenna end industrial computer is connected with the first switch through a network, and the source antenna end industrial computer is arranged on the device table and located in the shelter.

[0014] Optionally, the second three-axis turntable has the same structure as the first three-axis turntable, the first polarization axis, the first azimuth axis and the first tilt axis are arranged from top to bottom in sequence, the first azimuth axis is perpendicular to the first polarization axis, the first tilt axis is arranged horizontally and is perpendicular to the first azimuth axis, and the first polarization axis is perpendicular to the first tilt axis.

[0015] The first three-axis turntable further comprises a first tilt motor, a first azimuth motor and a first polarization motor, the first tilt motor is connected with the first tilt axis through a first transmission mechanism, the first tilt motor is used to drive the first tilt axis to rotate, so as to adjust the tilt angle of the source antenna, the first azimuth motor is connected with the first azimuth axis through a second transmission mechanism, the first azimuth motor is used to drive the first azimuth axis to rotate, so as to adjust the azimuth angle of the source antenna, and the first polarization motor is connected with the first polarization axis through a third transmission mechanism, the first polarization motor is used to drive the first polarization axis to rotate, so as to adjust the polarization angle of the source antenna.

[0016] Optionally, the first motion controller, the first driver, the second driver, the third driver, the first encoder, the second encoder and the third encoder are further included, the first motion controller is connected with the first switch network;

[0017] The first driver is electrically connected with the first motion controller and the first tilt motor, and the first motion controller is used for controlling the rotation angle of the first tilt motor through the first driver;

[0018] The second driver is electrically connected with the first motion controller and the first azimuth motor, and the first motion controller is used for controlling the rotation angle of the first azimuth motor through the second driver;

[0019] The third driver is electrically connected with the first motion controller and the first polarization motor, and the first motion controller is used for controlling the rotation angle of the first polarization motor through the third driver;

[0020] The first encoder is connected with the output shaft of the first tilt motor and electrically connected with the first driver to feed back the position signal of the first tilt motor to the first motion controller;

[0021] The second encoder is connected with the output shaft of the first azimuth motor and electrically connected with the second driver to feed back the position signal of the first azimuth motor to the first motion controller;

[0022] The third encoder is connected with the output shaft of the polarization motor and electrically connected with the third driver to feed back the position signal of the first polarization motor to the first motion controller.

[0023] Optionally, a first coaxial rotary joint is further included, and the first coaxial rotary joint is arranged on the first polarization rotary assembly including the first polarization shaft in the first three-axis turntable;

[0024] The first coaxial rotary joint is electrically connected with a first radio frequency cable and a second radio frequency cable, one end of the first radio frequency cable away from the first coaxial rotary joint is electrically connected with the source antenna, the first radio frequency cable rotates with the source antenna rotating around the axis of the first polarization shaft, and one end of the second radio frequency cable away from the first coaxial rotary joint is electrically connected with the signal source.

[0025] Optionally, the height of the test tower is 20 meters or 40 meters;

[0026] The to-be-tested antenna cover is provided with a to-be-tested antenna cover, and the horizontal distance between the standard gain antenna and the to-be-tested antenna cover is less than or equal to 8 meters.

[0027] Optionally, the signal source is connected with the source antenna through a power amplifier.

[0028] In the embodiment, the polarization position of the to-be-tested antenna is fixed, the polarization position of the source antenna can be adjusted through the first three-axis turntable, so that the polarization position of the source antenna can be matched and aligned with the polarization position of the to-be-tested antenna. In the embodiment, the pitch position and the azimuth position of the source antenna can be adjusted through the first three-axis turntable, and the pitch position and the azimuth position of the to-be-tested antenna can be adjusted through the two-axis turntable. For a test scene in which the to-be-tested antennas are distributed at multiple points and have different heights, the pitch position and the azimuth position of the source antenna and the to-be-tested antenna can be adjusted in two directions, so that the to-be-tested antennas at different positions and different heights can be accurately aligned with the source antenna, thereby improving the accuracy of the test.

[0029] The gain of the standard gain antenna is known at the design frequency of the to-be-tested antenna, and the gain of the to-be-tested antenna can be measured by using a comparison method based on the gain of the standard gain antenna. In the embodiment, the standard gain antenna is arranged on the lifting platform, and the height of the standard gain antenna can be adjusted during the test through the arrangement of the lifting platform. During the measurement of the gain of the to-be-tested antenna, the received signals of the standard gain antenna can be collected at multiple different heights near the height of the feed source of the to-be-tested antenna and averaged, so as to reduce the influence of environmental multipath interference on the gain measurement of the to-be-tested antenna and avoid the influence of the fixed height of the standard gain antenna on the gain measurement of the to-be-tested antenna.

[0030] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, can be implemented according to the content of the specification, and in order to let the above and other purposes, characteristics and advantages of the utility model can be more obvious and easy to understand, the following specific embodiment of the utility model is described in detail. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 A structure schematic view of a weather radar antenna far-field test system provided by the embodiment of the utility model is shown in the figure.

[0032] Figure 2 An electrical connection schematic view of a source antenna, a coaxial rotary joint, a power amplifier, a signal source, a first switch, a source antenna end industrial personal computer, a second switch, a measured antenna end industrial personal computer, a spectrum analyzer and a to-be-tested antenna in the weather radar antenna far-field test system provided by the embodiment of the utility model is shown in the figure.

[0033] Figure 3The utility model discloses a weather radar antenna far field test system in the structure diagram of equipment of test tower and test tower of providing for the embodiment of the utility model,

[0034] Figure 4 The utility model discloses a weather radar antenna far field test system in the layout diagram of tower top equipment of test tower of providing for the embodiment of the utility model,

[0035] Figure 5 The utility model discloses a weather radar antenna far field test system in the layout diagram of equipment platform of providing for the embodiment of the utility model,

[0036] Figure 6 The utility model discloses a weather radar antenna far field test system in the partial structure diagram of first three -axis turntable of providing for the embodiment of the utility model Figure 1 ;

[0037] Figure 7 The utility model discloses a weather radar antenna far field test system in the partial structure diagram of first three -axis turntable of providing for the embodiment of the utility model Figure 2 ;

[0038] Figure 8 The utility model discloses a weather radar antenna far field test system in the structure diagram of polarization rotation subassembly in first three -axis turntable of providing for the embodiment of the utility model,

[0039] Figure 9 The utility model discloses a weather radar antenna far field test system in the electric connection diagram of uninterruptible power supply, intelligent power distribution unit, first switch, source antenna end industrial computer, motion controller, first driver, second driver, third driver, first three -dimensional turntable of providing for the embodiment of the utility model.

[0040] Sign:

[0041] 1-source antenna, 2-first three -axis turntable, 201-first polarization rotation subassembly, 2011-first polarization axis, 202-first azimuth plate, 203-first azimuth axis, 204-first pitch box, 205-first pitch motor, 206-first azimuth motor, 207-first polarization motor, 3-test tower, 4-signal source, 5-radar tower, 6-two -axis turntable, 7-antenna to be measured, 8-standard gain antenna, 9-second three -axis turntable, 10-lifting platform, 11-spectrum analyzer, 12-first switch, 13-second switch, 14-measured antenna end industrial computer, 15-shelter, 16-equipment platform, 17-source antenna cover, 18-monitoring camera, 19-uninterruptible power supply, 20-intelligent power distribution unit, 21-source antenna end industrial computer, 22-hard disk video recorder, 23-power amplifier, 24-first motion controller, 25-first driver, 26-second driver, 27-third driver, 28-first coaxial rotary joint. Specific implementation

[0042] Exemplary embodiments of the present application will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it is understood that the present application can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0043] Referring to Figure 1 , Figure 3 , Figures 6 to 8 The embodiment of the present application discloses a weather radar antenna far field test system, which comprises a test tower 3, a first three-axis turntable 2, a source antenna 1, a signal source 4, a radar tower 5, a two-axis turntable 6, an antenna to be tested 7, a standard gain antenna 8, a second three-axis turntable 9, a lifting platform 10 and a spectrum analyzer 11, the source antenna 1 is electrically connected with the signal source 4, and the spectrum analyzer 11 is electrically connected with the antenna to be tested 7 and the standard gain antenna 8 in time sharing mode.

[0044] The first three-axis turntable 2 is arranged on the test tower 3, the source antenna 1 is arranged on the first three-axis turntable 2, the two-axis turntable 6 is arranged on the radar tower 5, the antenna to be tested 7 is arranged on the two-axis turntable 6, the second three-axis turntable 9 is installed on the lifting platform 10, and the standard gain antenna 8 is arranged on the second three-axis turntable 9; the first three-axis turntable 2 comprises a first tilting shaft, a first azimuth shaft 203 and a first polarization shaft 2011, the two-axis turntable 6 comprises a second tilting shaft and a second azimuth shaft, and the second three-axis turntable 9 comprises a third tilting shaft, a third azimuth shaft and a third polarization shaft.

[0045] The two-axis turntable 6 can be replaced by a radar turntable or be modified from a radar turntable. The signal source 4 is used for generating a radio frequency signal, which can be a signal with known characteristics, and the signal source 4 can be a radio frequency signal generator. The source antenna 1 is used for emitting the signal generated by the signal source 4, the antenna to be tested 7 is used for receiving the signal emitted by the source antenna 1 when the antenna to be tested 7 is running, and the standard gain antenna 8 is used for receiving the signal emitted by the source antenna 1 when the standard gain antenna 8 is running. During the test, the signal source 4 generates a signal, the source antenna 1 emits the signal, and the antenna to be tested 7 or the standard gain antenna 8 receives the signal, and then the received signal is analyzed by the spectrum analyzer 11.

[0046] The weather radar antenna far field test system is an open loop test system, and the open loop test system has relatively low cost and full functions. The working principle of the weather radar antenna far field test system can be that: the signal source 4 generates a signal, the signal generated by the signal source 4 is sent to the source antenna 1 through a radio frequency cable and radiated to space by the source antenna 1, and finally reaches the mouth surface of the to-be-tested antenna 7 in the far field and uniformly irradiates it, and the to-be-tested antenna 7 is in a receiving state. During the test process, the polarization direction of the source antenna 1 is consistent with that of the to-be-tested antenna 7.

[0047] The source antenna 1 is specifically a reflector antenna, and the diameter of the source antenna 1 can be about 1.2 meters. The signal source 4 can generate radio frequency signals in the S, C and X frequency bands. The source antenna 1 can be divided into an S-band source antenna, a C-band source antenna and an X-band source antenna. The standard gain antenna 8 is specifically a standard gain horn antenna, and the standard gain horn antenna has the characteristics of being light and accurate in gain. The gain of the standard gain antenna 8 is not less than 20 dBi (decibels).

[0048] The spectrum analyzer 11 is connected with the to-be-tested antenna 7 and the standard gain antenna 8 at different times, that is, the spectrum analyzer 11 is connected with the to-be-tested antenna 7 and the standard gain antenna 8 at different times. The spectrum analyzer 11 is connected with the to-be-tested antenna 7 at a first time period, and analyzes the signal received by the to-be-tested antenna 7. The spectrum analyzer 11 is connected with the standard gain antenna 8 at a second time period, and analyzes the signal received by the standard gain antenna 8, and the second time period is different from the first time period. It should be noted that the switching of the electrical connection of the spectrum analyzer 11 with the to-be-tested antenna 7 and the electrical connection of the spectrum analyzer 11 with the standard gain antenna 8 can be realized by an electrically controlled switch.

[0049] The first three-axis turntable can be used to adjust the pitch position, azimuth position and polarization position of the source antenna 1. The pitch position, azimuth position and polarization position of the source antenna 1 can be understood as the pitch angle, azimuth angle and polarization angle of the source antenna 1. The polarization angle of the source antenna 1 can be understood as the angle of rotation of the source antenna 1 around the central axis relative to the initial position (which can also be understood as the standard position). The adjustment range of the polarization angle of the source antenna 1 can be 0°-360°. The azimuth angle can be understood as the included angle between the current projection line of the central axis of the source antenna 1 in the horizontal plane and the projection line of the central axis of the source antenna 1 in the initial position in the horizontal plane. The pitch angle can be understood as the included angle between the central axis of the source antenna 1 and the horizontal plane. The two-axis turntable 6 can be used to adjust the pitch position and azimuth position of the to-be-tested antenna 7. The second three-axis turntable 9 can be used to adjust the pitch position, azimuth position and polarization position of the standard gain antenna 8. The adjustment range of the polarization angle of the standard gain antenna 8 can be 0°-360°.

[0050] The height of the test tower 3 can be set according to actual needs, for example, can be 20 meters or 40 meters. The test tower 3 can be built on a high ground, and there is no obstruction near the high ground, and there is no mountain higher than the high ground on the line connecting the test antenna 7. The radar tower 5 can be built on a high ground, and the distance between the test tower 3 and the radar tower 5 meets the far-field test distance condition. The source antenna 1 is arranged on the test tower 3, and the test antenna 7 is arranged on the radar tower 5, which can weaken the influence of the ground and also weaken the influence of the surrounding stray reflection waves. The lifting platform 10 is located beside the radar tower 5. The test antenna 7 is covered with a test antenna cover, and the horizontal distance between the standard gain antenna 8 and the test antenna cover can be less than or equal to 8 meters. The lifting platform 10 can be arranged on the radar tower 5 or on a high ground.

[0051] It should be noted that the lifting platform 10 can be disassembled, and a set of lifting platform 10, second three-axis turntable 9 and standard gain antenna 8 can be installed near different test antennas 7. For the case that the lifting platform 10, the second three-axis turntable 9 and the standard gain antenna 8 are fixed in position, a set of lifting platform 10, second three-axis turntable 9 and standard gain antenna 8 can be matched for each set of test antenna 7.

[0052] The weather radar antenna far-field test system can realize the alignment of the test antenna 7 and the source antenna 1 through bidirectional scanning. The process of realizing the alignment of the test antenna 7 and the source antenna 1 through bidirectional scanning can be: adjusting the angle of the source antenna 1 through the first three-axis turntable 2 to make the source antenna 1 roughly align with the test antenna 7; then, controlling the azimuth and elevation scanning of the second three-axis turntable 6; finding the maximum value corresponding to the azimuth and elevation angle in the directional diagram, and adjusting the azimuth position and elevation position of the test antenna 7 according to the azimuth and elevation angle; controlling the azimuth and elevation scanning of the first three-axis turntable 2, and finding the maximum value corresponding to the elevation angle and azimuth angle in the directional diagram, and adjusting the elevation position and azimuth position of the source antenna 1 according to the elevation angle and azimuth angle. After adjustment, the electrical axis of the source antenna 1 and the test antenna 7 is strictly aligned; controlling the polarization scanning of the first three-axis turntable 2 to make the polarization position of the source antenna 1 match and align with the polarization position of the test antenna 7. The alignment of the source antenna 1 and the test antenna 7 is very important when testing the dual-polarization and cross-polarization isolation, and the bidirectional scanning mode can make the source antenna 1 and the test antenna 7 strictly and accurately aligned.

[0053] In the embodiment, the polarization position of the antenna under test 7 is fixed, the polarization position of the source antenna 1 can be adjusted by the first three-axis turntable 2, so that the polarization position of the source antenna 1 can be matched and aligned with the polarization position of the antenna under test 7. In the test scene where the antenna under test 7 is distributed at multiple points and has different heights, there is a difference in azimuth and elevation between the antenna under test 7 and the source antenna 1. In the embodiment, the elevation position and the azimuth position of the source antenna 1 can be adjusted by the first three-axis turntable 2, and the elevation position and the azimuth position of the antenna under test 7 can be adjusted by the two-axis turntable 6. For the test scene where the antenna under test 7 is distributed at multiple points and has different heights, the elevation position and the azimuth position of the source antenna 1 and the antenna under test 7 can be adjusted in both directions, so that the antenna under test 7 at different positions and different heights can be accurately aligned with the source antenna 1, thereby improving the accuracy of the test.

[0054] The gain of the standard gain antenna 8 is known at the design frequency of the antenna under test 7, and the gain of the antenna under test 7 can be measured by using the comparison method based on the gain of the standard gain antenna 8. The process of measuring the gain of the antenna under test 7 by using the comparison method can be as follows: at a similar time, the signal source 4 transmits a radio frequency signal, the antenna under test 7 adjusts the azimuth angle and the elevation angle until the radio frequency signal received by the spectrum analyzer 11 is maximum, and the power level value at this time is recorded as P1; the height of the standard gain antenna 8 is adjusted by the lifting platform 10, and the azimuth position, the elevation position and the polarization position of the standard gain antenna 8 are adjusted at multiple different heights respectively until the radio frequency signal received by the spectrum analyzer 11 is maximum, and the power level value at this time is recorded as P2; then the average value of P2 corresponding to the multiple different heights is calculated; and the gain of the antenna under test 7 is calculated according to P1, the average value of P2 corresponding to the multiple different heights and the gain of the standard gain antenna 8 at the frequency point. The multiple different heights can be seven different heights, which are the height of the feed source of the antenna under test 7 minus 3 meters, the height of the feed source of the antenna under test 7 minus 2 meters, the height of the feed source of the antenna under test 7 minus 1 meter, the height of the feed source of the antenna under test 7, the height of the feed source of the antenna under test 7 plus 1 meter, the height of the feed source of the antenna under test 7 plus 2 meters and the height of the feed source of the antenna under test 7 plus 3 meters respectively.

[0055] In the embodiment, the standard gain antenna 8 is arranged on the lifting platform 10, and the height of the standard gain antenna 8 can be adjusted during the test process by the arrangement of the lifting platform 10. In the process of measuring the gain of the antenna under test 7, the received signals of the standard gain antenna 8 can be collected at multiple different heights near the height of the feed source of the antenna under test 7 and the average value is calculated, which can reduce the influence of environmental multipath interference on the gain measurement of the antenna under test 7, and can avoid that the gain measurement of the antenna under test is easily affected by the surrounding environmental multipath due to the fixed height of the standard gain antenna 8.

[0056] In some embodiments, with reference to Figure 2The weather radar antenna far field test system further comprises a first switch 12, a second switch 13 and a measured antenna end industrial personal computer 14, the first switch 12 is connected with the signal source 4 through network, the first switch 12 is connected with the second switch 13 through network, the spectrum analyzer 11 is connected with the second switch 13 through network, and the second switch 13 is connected with the measured antenna end industrial personal computer 14 through network.

[0057] The measured antenna end industrial personal computer 14 is an industrial control computer. The analysis result generated by the spectrum analyzer 11 after analyzing the signal is transmitted to the measured antenna end industrial personal computer 14 through the second switch 13. The analysis result generated by the spectrum analyzer 11 after analyzing the signal can be received through the measured antenna end industrial personal computer 14. The measured antenna end industrial personal computer 14 controls the signal source 4 through the second switch 13 and the first switch 12, and the frequency selection and output power selection of the signal source 4 can be remotely controlled through the measured antenna end industrial personal computer 14.

[0058] In some embodiments, referring to Figures 3 to 5 The weather radar antenna far field test system further comprises a shelter 15 and a device table 16, the shelter 15 is arranged on the test tower 3, the device table 16 is located in the shelter 15, the signal source 4 and the first switch 12 are arranged on the device table 16 and located in the shelter 15, and the first three-axis turntable 2 and the source antenna 1 are located outside the shelter 15 and above the shelter 15. The source antenna 1 is covered by a source antenna cover 17. An air conditioner can be arranged in the shelter 15. The material of the shelter 15 can be steel. The arrangement of the shelter 15 can protect the equipment arranged on the device table 16.

[0059] In some embodiments, referring to Figure 4 、 Figure 5 and Figure 9 The weather radar antenna far field test system further comprises a hard disk video recorder 22 and a plurality of monitoring cameras 18, the plurality of monitoring cameras 18 are connected with the hard disk video recorder 22 through network, at least one monitoring camera 18 is arranged in the shelter 15, at least one monitoring camera 18 is arranged outside the shelter 15, and the plurality of monitoring cameras 18 are connected with the first switch 12 through network.

[0060] The hard disk video recorder 22 is an electronic device based on hard disk storage, which is used for recording and managing video signals. The number of the monitoring cameras 18 can be three, one of which is arranged in the shelter 15, and the other two are arranged outside the shelter 15. The measured antenna end industrial personal computer 14 can acquire the video shot by the monitoring cameras 18 through the second switch 13 and the first switch 12, and remotely view the video shot by the monitoring cameras 18 through the measured antenna end industrial personal computer 14.

[0061] In some embodiments, the weather radar antenna far-field test system further comprises a source antenna end industrial computer 21, the source antenna end industrial computer 21 is network connected with the first switch 12, and the source antenna end industrial computer 21 is placed on the equipment table 16 and located in the shelter 15.

[0062] The weather radar antenna far-field test system further comprises an uninterruptible power supply (UPS) 19 and an intelligent power distribution unit 20, both of which are placed on the equipment table 16 and located in the shelter 15. The uninterruptible power supply 19 is electrically connected with the intelligent power distribution unit 20, and the intelligent power distribution unit 20 is electrically connected with the first switch 12, the source antenna end industrial computer 21 and the like. The intelligent power distribution unit 20 has a remote control function. The intelligent power distribution unit 20 is a device that adds intelligent functions on the basis of a traditional PDU (Power Distribution Unit), and is mainly used for power distribution, remote management and the like.

[0063] In some embodiments, the second three-axis turntable 9 has the same structure as the first three-axis turntable 2; refer to Figures 6 to 9 , the first polarization axis 2011, the first azimuth axis 203 and the first elevation axis are arranged in order from top to bottom, the first azimuth axis 203 is perpendicular to the first polarization axis 2011, the first elevation axis is horizontally arranged, and the first elevation axis is perpendicular to the first azimuth axis 203, and the first polarization axis 2011 is perpendicular to the first elevation axis; the first three-axis turntable 2 further comprises a first elevation motor 205, a first azimuth motor 206 and a first polarization motor 207, the first elevation motor 205 is connected with the first elevation axis through a first transmission mechanism, the first elevation motor 205 is used to drive the first elevation axis to rotate, so as to adjust the elevation angle of the source antenna 1, the first azimuth motor 206 is connected with the first azimuth axis 203 through a second transmission mechanism, the first azimuth motor 206 is used to drive the first azimuth axis 203 to rotate, so as to adjust the azimuth angle of the source antenna 1, and the first polarization motor 207 is connected with the first polarization axis 2011 through a third transmission mechanism, the first polarization motor 207 is used to drive the first polarization axis 2011 to rotate, so as to adjust the polarization angle of the source antenna 1.

[0064] The axis of the first polarization axis 2011 can refer to the dashed line shown by the A arrow in Figure 6 , the axis of the first azimuth axis 203 can refer to the dashed line shown by the B arrow in Figure 6 and Figure 7 , and the axis of the first elevation axis can refer to the dashed line shown by the C arrow in Figure 7The dashed line is shown by the middle C arrow. The first three-axis turntable 2 further comprises a first tilt rotation assembly, a first azimuth rotation assembly and a first polarization rotation assembly. The first tilt rotation assembly comprises a first tilt shaft and a first transmission mechanism. The first azimuth rotation assembly comprises a first azimuth shaft 203 and a second transmission mechanism. The first polarization rotation assembly 201 comprises a first polarization shaft 2011 and a third transmission mechanism. The first transmission mechanism, the second transmission mechanism and the third transmission mechanism can all be speed reduction mechanisms, for example, gear reduction mechanisms. The first tilt motor 205, the first azimuth motor 206 and the first polarization motor 207 can all be servo motors.

[0065] The first three-axis turntable 2 further comprises a first tilt box body 204. The first tilt shaft is connected with the first tilt box body 204. The first tilt shaft rotates to drive the first tilt box body 204 to rotate around the axis of the first tilt shaft. The first azimuth rotation assembly is arranged on the first tilt box body 204. The first three-axis turntable 2 further comprises a first azimuth plate 202. The first azimuth plate 202 is connected with the first azimuth shaft 203. The first azimuth shaft 203 rotates to drive the first azimuth plate 202 to rotate around the axis of the first azimuth shaft 203. The first polarization rotation assembly is arranged on the first azimuth plate 202. The first polarization shaft 2011 is connected with the source antenna 1.

[0066] The two-axis turntable 6 further comprises a second tilt motor, a second azimuth motor, a second tilt box body and a second azimuth plate. The structure of the second tilt shaft, the second azimuth shaft, the second tilt motor, the second azimuth motor, the second tilt box body and the second azimuth plate in the two-axis turntable 6 is the same as the structure of the first tilt shaft, the first azimuth shaft 203, the first tilt motor 205, the first azimuth motor 206, the first tilt box body 204 and the first azimuth plate 202 in the first three-axis turntable 2. The difference between the two-axis turntable 6 and the first three-axis turntable 2 is that the two-axis turntable 6 does not comprise a polarization rotation assembly and a polarization motor. The antenna under test 7 is connected to the second azimuth plate in the two-axis turntable 6 through a support.

[0067] In some embodiments, with reference to Figure 9 , the weather radar antenna far-field test system further comprises a first motion controller 24, a first driver 25, a second driver 26, a third driver 27, a first encoder, a second encoder and a third encoder. The first motion controller 24 is connected with the first switch 12 in a network;

[0068] The first driver 25 is electrically connected with the first motion controller 24 and the first pitch motor 205, and the first motion controller 24 is configured to control the rotation angle of the first pitch motor 205 through the first driver 25; the second driver 26 is electrically connected with the first motion controller 24 and the first azimuth motor 206, and the first motion controller 24 is configured to control the rotation angle of the first azimuth motor 206 through the second driver 26; the third driver 27 is electrically connected with the first motion controller 24 and the first polarization motor 207, and the first motion controller 24 is configured to control the rotation angle of the first polarization motor 207 through the third driver 27.

[0069] The first encoder is connected with the output shaft of the first pitch motor 205 and electrically connected with the first driver 25 to feed back the position signal of the first pitch motor 205 to the first motion controller 24; the second encoder is connected with the output shaft of the first azimuth motor 206 and electrically connected with the second driver 26 to feed back the position signal of the first azimuth motor 206 to the first motion controller 24; the third encoder is connected with the output shaft of the first polarization motor 207 and electrically connected with the third driver 27 to feed back the position signal of the first polarization motor 207 to the first motion controller 24.

[0070] The first motion controller 24 can output a rotation instruction signal to the first driver 25, the second driver 26 and the third driver 27 to control the rotation angle of the first pitch motor 205, the first azimuth motor 206 and the first polarization motor 207. The encoder is an optical position detection element, which can include an encoder disk, an optical sensor and an electronic signal processor. After receiving the position signal of the corresponding motor fed back by any one of the first encoder, the second encoder and the third encoder, the first motion controller 24 can accurately control the rotation speed and direction of the corresponding motor based on the position signal.

[0071] The first motion controller 24 is controlled by the second switch 13 and the first switch 12 through the measured antenna end industrial computer 14, and the attitude of the source antenna 1 can be remotely controlled through the measured antenna end industrial computer 14. It should be noted that the second three-axis turntable 9 can also be provided with a second motion controller, a plurality of drivers and the like, which will not be described here.

[0072] In some embodiments, with reference to Figure 2The weather radar antenna far field test system further comprises a first coaxial rotary joint 28 arranged on the first polarization rotation assembly 201 in the first three-axis turntable 2; the first coaxial rotary joint 28 is electrically connected with the first radio frequency cable and the second radio frequency cable, one end of the first radio frequency cable away from the first coaxial rotary joint 28 is electrically connected with the source antenna 1, and the first radio frequency cable rotates along with the rotation of the source antenna 1 around the axis of the first polarization axis 2011; one end of the second radio frequency cable away from the first coaxial rotary joint 28 is electrically connected with the signal source 4.

[0073] The first polarization rotation assembly 201 is a hollow turntable structure. The first coaxial rotary joint 28 is used for electrical connection of the first radio frequency cable and the second radio frequency cable, and can prevent the second radio frequency cable from rotating along with the rotation of the first radio frequency cable, that is, through the arrangement of the first coaxial rotary joint 28, when the first radio frequency cable rotates, the second radio frequency cable will not rotate along with it. It should be noted that the second coaxial rotary joint is also arranged on the second polarization rotation assembly in the second three-axis turntable 9.

[0074] In some embodiments, with reference to Figure 2 The weather radar antenna far field test system further comprises a power amplifier 23, and the signal source 4 is connected with the source antenna 1 through the power amplifier 23. The power amplifier 23 can be arranged on the equipment table 16 and located in the shelter 15. The power amplifier 23 is used for amplifying the signal generated by the signal source 4. Through the arrangement of the power amplifier 23, the dynamic range of the antenna test can be improved.

[0075] It should be noted that in this document, the terms "comprise", "comprise", or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed, or include elements inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "comprises a" does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0076] The embodiments of the utility model are described above in combination with the drawings, but the utility model is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only illustrative but not restrictive, and the ordinary skilled in the art can make many forms under the inspiration of the utility model without departing from the purpose of the utility model and the scope of protection, and these all belong to the protection of the utility model.

Claims

1. A weather radar antenna far-field test system, characterized by, The utility model relates to a test tower, a first three -axis turntable, a source antenna, a signal source, a radar tower, a two -axis turntable, an antenna under test, a standard gain antenna, a second three -axis turntable, a lifting platform and a spectrum analyzer, the source antenna is electrically connected with the signal source, the spectrum analyzer is electrically connected with the antenna under test and the standard gain antenna in time sharing, The first three -axis turntable is arranged on the test tower, the source antenna is arranged on the first three -axis turntable, the two -axis turntable is arranged on the radar tower, the antenna under test is arranged on the two -axis turntable, the second three -axis turntable is installed on the lifting platform, and the standard gain antenna is installed on the second three -axis turntable, The first three -axis turntable includes a rotatable first pitch axis, a first azimuth axis and a first polarization axis, the two -axis turntable includes a rotatable second pitch axis and a second azimuth axis, and the second three -axis turntable includes a rotatable third pitch axis, a third azimuth axis and a third polarization axis.

2. The weather radar antenna far-field test system of claim 1, wherein, It also includes a first switch, a second switch and a measured antenna end industrial computer, the first switch is network connected with the signal source, the first switch is connected with the second switch through a network, the spectrum analyzer is network connected with the second switch, and the second switch is network connected with the measured antenna end industrial computer.

3. The weather radar antenna far-field test system of claim 2, wherein, It also includes a shelter and a device platform, the shelter is arranged on the test tower, the device platform is located in the shelter, the signal source and the first switch are arranged on the device platform and located in the shelter, and the first three -axis turntable and the source antenna are located outside the shelter and above the shelter.

4. The weather radar antenna far-field test system of claim 3, wherein, It also includes a hard disk recorder and a plurality of monitoring cameras, and the plurality of monitoring cameras are network connected with the hard disk recorder; At least one monitoring camera is installed in the shelter, at least one monitoring camera is installed outside the shelter, and the plurality of monitoring cameras are network connected with the first switch.

5. The weather radar antenna far-field test system of claim 3, wherein, It also includes a source antenna end industrial computer, the source antenna end industrial computer is network connected with the first switch, and the source antenna end industrial computer is arranged on the device platform and located in the shelter.

6. The weather radar antenna far-field test system according to any of claims 2 to 5, characterized in that, The second three -axis turntable has the same structure as the first three -axis turntable, the first polarization axis, the first azimuth axis and the first pitch axis are arranged from top to bottom, the first azimuth axis is perpendicular to the first polarization axis, the first pitch axis is horizontally arranged, the first pitch axis is perpendicular to the first azimuth axis, and the first polarization axis is perpendicular to the first pitch axis; The first three-axis turntable further comprises a first elevation motor, a first azimuth motor and a first polarization motor, the first elevation motor is connected with the first elevation shaft through a first transmission mechanism, the first elevation motor is used to drive the first elevation shaft to rotate, so as to adjust the elevation angle of the source antenna, the first azimuth motor is connected with the first azimuth shaft through a second transmission mechanism, the first azimuth motor is used to drive the first azimuth shaft to rotate, so as to adjust the azimuth angle of the source antenna, and the first polarization motor is connected with the first polarization shaft through a third transmission mechanism, the first polarization motor is used to drive the first polarization shaft to rotate, so as to adjust the polarization angle of the source antenna.

7. The weather radar antenna far-field test system of claim 6, wherein, Further comprising a first motion controller, a first driver, a second driver, a third driver, a first encoder, a second encoder and a third encoder, the first motion controller is connected with the first switch network; The first driver is electrically connected with the first motion controller and the first elevation motor, and the first motion controller is used to control the rotation angle of the first elevation motor through the first driver; The second driver is electrically connected with the first motion controller and the first azimuth motor, and the first motion controller is used to control the rotation angle of the first azimuth motor through the second driver; The third driver is electrically connected with the first motion controller and the first polarization motor, and the first motion controller is used to control the rotation angle of the first polarization motor through the third driver; The first encoder is connected with the output shaft of the first elevation motor and electrically connected with the first driver, so as to feed back the position signal of the first elevation motor to the first motion controller; The second encoder is connected with the output shaft of the first azimuth motor and electrically connected with the second driver, so as to feed back the position signal of the first azimuth motor to the first motion controller; The third encoder is connected with the output shaft of the first polarization motor and electrically connected with the third driver, so as to feed back the position signal of the first polarization motor to the first motion controller.

8. The weather radar antenna far-field test system of claim 6, wherein, Further comprising a first coaxial rotary joint, the first coaxial rotary joint is arranged on the first polarization rotating assembly comprising the first polarization shaft in the first three-axis turntable; The first coaxial rotary joint is electrically connected with a first radio frequency cable and a second radio frequency cable, one end of the first radio frequency cable away from the first coaxial rotary joint is electrically connected with the source antenna, the first radio frequency cable rotates with the source antenna rotating around the axis of the first polarization shaft, and one end of the second radio frequency cable away from the first coaxial rotary joint is electrically connected with the signal source.

9. The weather radar antenna far-field test system of claim 1, wherein, The height of the test tower is 20 meters or 40 meters; The to-be-tested antenna cover is provided with a to-be-tested antenna cover, and the horizontal distance between the standard gain antenna and the to-be-tested antenna cover is less than or equal to 8 meters.

10. The weather radar antenna far-field test system of claim 1, wherein, Further comprising a power amplifier, the signal source is connected with the source antenna through the power amplifier.

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