CN111537807A - Method for assisting in testing antenna directional diagram in large-maneuvering flight state by unmanned aerial vehicle - Google Patents
Method for assisting in testing antenna directional diagram in large-maneuvering flight state by unmanned aerial vehicle Download PDFInfo
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Abstract
The invention discloses a method for assisting in testing a large-mobility flight state antenna directional diagram by an unmanned aerial vehicle, and aims to provide a testing method for solving the wireless problems of compatibility of a radio frequency link and a radio frequency related to an antenna of an outfield aircraft under a large-mobility condition. The invention is realized by the following technical scheme: utilize the difference GPS ground mobile station that unmanned aerial vehicle built, unmanned aerial vehicle machine carries the GPS antenna and passes through the synchronous clock module with the frequency reference, embedded module and signal source are sent into respectively to the GPS time, embedded module is according to the GPS time of supplementary unmanned aerial vehicle's machine year flight control system input, the enable signal that the position produced sends into signal source and machine year data link terminal, the signal waveform of the supplementary unmanned aerial vehicle transmission of ground terminal remote control, according to test unmanned aerial vehicle transform height, hover or fly around, the flight strategy of supplementary unmanned aerial vehicle is adjusted in a flexible way through the test revolving stage of ground station, accomplish the airborne antenna's that awaits measuring of different pitch angles and azimuth test directional diagram.
Description
Technical Field
The invention relates to the technical field of antenna testing, in particular to an auxiliary testing method for verifying an ultra-short wave antenna directional pattern of a complete machine in an external field of a large airborne platform of an unmanned aerial vehicle.
Background
Radio technology equipment such as communication, radar, navigation, broadcasting, television and the like, which propagate information by radio waves, require the transmission and reception of radio waves. The antenna is used as an important component of an airborne radio frequency sensor system, the directivity pattern is an important index of the antenna, and the test and verification become important work content in the current engineering model development. In order to achieve the best communication effect, the antenna must have a certain directivity, a high conversion efficiency, and a bandwidth satisfying the system operation. Depending on the task of the radio technology equipment, it is often required that the antenna does not radiate uniformly in all directions or have equal reception capability in all directions, but only radiates or receives radio waves from a specific area, and does not radiate or radiates weakly in other directions, i.e. the antenna is required to have directivity. If the antenna is not directional, for the transmitting antenna, only a small part of the radiated power reaches the required direction, and most of the power is wasted in the direction which is not required; for the receiving antenna, while receiving the required signal, it also receives interference and noise from other directions, even submerging the signal in the interference and noise completely. The accurate test of the antenna directional diagram is related to the radio test of a radio frequency functional link, radio frequency compatibility, radio frequency stealth and the like of a radio frequency system. The principle of measuring the directional diagram is simple, but the problem of many aspects is involved in accurately determining the directional diagram, and the difficulty is high. The national military standards such as GJB-8815 and the like make specific specifications and requirements on the test and calibration of parameters such as antenna directional diagrams and the like, an ideal test site is an anechoic chamber, but the site is generally only suitable for high-frequency antenna test and requires that the use scene of the antenna to be tested is flexible. For a low-frequency antenna, such as a broadcast television tower antenna, the size and the floor space are large, laboratory test activities of the antenna cannot be carried out, a directional pattern of the antenna can be tested only in an open field, and a huge test problem is also faced due to the size problem. The antenna directional diagram is tested in a microwave darkroom, the performance test of a single antenna is basically carried out before installation, and the test of the whole antenna is not carried out in the darkroom generally. The main reason is that the darkroom single antenna test cannot accurately evaluate the distortion influence of the antenna mounting backward direction; as the size of the airborne platform is generally 10 m-20 m magnitude, part of the airborne platform is larger and cannot adapt to the size of a darkroom dead zone; airborne antennas such as compass, beacon, shortwave, ultrashort wave antennas are low frequency (below 300 MHz), and darkrooms have substantially no far field conditions at such low frequency conditions. Therefore, the complete machine test of the antenna is mostly carried out in an external field, and the turret is utilized to simulate the attitude change of the airplane in azimuth and pitch. The current rotary table at home has the capability of rotating in 360 degrees in azimuth, but in the pitching dimension, the rotation is limited by the size and weight of an airplane, the torque of the rotary table can support the maneuvering range of the pitching angle within +/-30 degrees, and meanwhile, the erection height of an antenna at a general auxiliary end is equivalent to that of a testing end, so that the antenna test of an external field complete machine is mainly concentrated in the angular range of 360 degrees in azimuth and +/-30 degrees in pitching. At present, the major impact on the antenna by installation is mainly focused on an ultrashort wave band (108-. In the plane flight condition or the small maneuvering condition (the pitching/rolling is less than 20 degrees), the functional link mainly uses the antenna gain within +/-30 degrees of pitching. In the existing external field testing system, the auxiliary end is fixed on the ground or on the mountain head, the influence of multipath is large, the pitching rotation capacity of the rotary table is limited, and the pitching angle testing range cannot exceed 30 degrees. In order to adapt to the performance test of the communication link after the antenna is installed under the condition of large maneuvering of the airplane, the performance of the antenna under the condition of large pitching angle after the antenna is installed needs to be tested, the general pitching angle needs to exceed 60 degrees, and the part of extreme conditions needs to reach 80 degrees. Therefore, a new test means needs to be further developed to meet the antenna performance test under the large-mobility condition, and further verify the functions of the radio frequency link, the radio frequency compatibility, the radio frequency stealth and the like related to the antenna under the large-mobility condition.
With the rapid development of electronic information technology, unmanned aerial vehicles gradually move into the field of vision of the public, and due to the characteristics of lightness, low cost, flexible flight and the like, the unmanned aerial vehicles are widely applied to social production and life, including aerial photography, meteorological observation, agricultural plant protection, electric power line patrol and the like, and are widely concerned by various industries. Therefore, the application of the unmanned aerial vehicle to the antenna test is a new idea and a new subject for solving the measurement and verification of the characteristic parameters of the current low-frequency antenna. The unmanned aerial vehicle is an aircraft flying in a remote control or program control mode and mainly comprises a flight control system, a data link system, a power system, a sensor system and the like. Generally, the two types are fixed wing and rotor wing. The unmanned aerial vehicle can obtain an antenna directional diagram of the antenna to be tested about a pitch angle theta and an azimuth angle phi in a horizontal plane or spherical flight test. The classical short-wave antenna directional diagram is tested by theoretical calculation and a reduced scale model test. With the continuous development of antenna technology, many short-wave antennas are continuously introduced, and due to the ambiguity or uncertainty of the directivity parameters, great inconvenience is brought to the design of communication lines, and the antennas cannot be correctly used. In some cases, the classical short-wave antenna also meets the conditions that the field fluctuation is larger than the standard regulation, or the distance between the classical short-wave antenna and the surrounding antenna is too close to meet the use requirement, and the like. For the measurement of the directivity of the short wave antenna, a balloon or an airplane is used as a carrier, a signal source and a transmitting antenna are carried, and the measurement is carried out along the circumference taking the antenna to be measured as the center. However, these methods are limited by various factors such as cost, time, manpower, weather, etc. In view of these circumstances, a set of fast, advanced and high-precision short-wave antenna testing system is urgently needed to solve the long-standing problem that the directivity index of the short-wave antenna can only be comprehensively judged by a large amount of test data. According to the antenna reciprocity theorem, the tested antenna is used for receiving the radio-frequency signal transmitted by the remote source of the unmanned aerial vehicle, and the received signal is weak because of the far-field test requirement and the light requirement of the signal generation system, the unmanned aerial vehicle flies far and the power of the signal source is limited. Generally, the unmanned aerial vehicle flies horizontally along the plane E or the plane H of the radiation pattern of the tested antenna at a fixed height and approximately in a straight course, and the co-polarization or cross-polarization pattern of the tested antenna at a certain frequency point can be tested and obtained because the dipole antenna of the signal source is linearly polarized in the horizontal flight path of the unmanned aerial vehicle. Firstly, with the increase of the observation angle from the tested antenna to the unmanned aerial vehicle, the distance from the unmanned aerial vehicle to the antenna is gradually increased, so that the space path loss is increased, and the change range directly influences the dynamic range of the ground receiver; secondly, in order to achieve the purpose of testing the directional pattern under a large observation angle, the longer the distance of the unmanned aerial vehicle flying away from the antenna is, the longer the endurance time of the aircraft is required, and only a one-dimensional directional pattern of the antenna can be obtained. Therefore, more complex flight strategies need to be employed.
Disclosure of Invention
Aiming at the requirement of large pitch angle of the conventional whole machine antenna test and verification, the invention verifies the radio technical indexes such as radio frequency link, radio frequency compatibility, radio frequency stealth and the like related to the antenna under the large-maneuvering condition, adopts an unmanned aerial vehicle to carry out auxiliary test, solves the performance test problem of the airborne antenna under the large-maneuvering flight condition, provides a method for the unmanned aerial vehicle to carry out auxiliary test on the large-maneuvering flight state antenna directional diagram, which can meet the gain index of the large pitch angle of the whole machine external field antenna directional diagram, and solves the wireless test problems of the radio frequency link, the radio frequency compatibility, the radio frequency stealth and the like related to the antenna of the external field whole machine under the large-maneuvering condition.
The technical scheme adopted by the invention for solving the technical problem is as follows: the method for the unmanned aerial vehicle to assist in testing the antenna directional diagram in the large-maneuvering flight state has the following technical characteristics: utilize unmanned aerial vehicle to build including carrying out bidirectional communication's unmanned aerial vehicle auxiliary test end ground station terminal with control center, have the difference GPS ground mobile station of antenna, erect the unmanned aerial vehicle auxiliary test system who is equipped with auxiliary test antenna, signal source, its characterized in that: the unmanned aerial vehicle airborne GPS antenna respectively sends frequency reference and GPS time to the embedded module and the signal source through the synchronous clock module, the embedded module sends enabling signals generated according to the GPS time and the position input by the airborne flight control system of the auxiliary unmanned aerial vehicle to the signal source, and simultaneously sends the GPS time, the position and waveform data to the airborne data link terminal; the signal source transmits an auxiliary test signal to a to-be-tested airborne antenna of the to-be-tested unmanned aerial vehicle through an auxiliary test antenna erected on the auxiliary unmanned aerial vehicle, so that the transmission of the auxiliary test signal is completed; the ground station terminal utilizes a GPS control module of a differential GPS ground station to complete the real-time position control, data exchange, signal transmission control and synchronization of the auxiliary unmanned aerial vehicle; ground terminal receives supplementary airborne data link terminal data, and the signal waveform of the supplementary unmanned aerial vehicle transmission of remote control simultaneously through the vector network analyzer that control center links to each other, according to test unmanned aerial vehicle transform height, hover or around flying, the test revolving stage through the ground station is nimble adjusts supplementary unmanned aerial vehicle's flight strategy, accomplishes the directional diagram test of the airborne antenna that awaits measuring of different every single move angles and azimuth.
Compared with the prior art, the invention has the following effects:
the invention adopts the unmanned aerial vehicle to carry out auxiliary test, and the unmanned aerial vehicle is provided with auxiliary test antennas, signal sources and other equipment to finish the emission of auxiliary test signals. The signal waveform is transmitted by the ground terminal data link remote control unmanned aerial vehicle, and the whole antenna test of different pitching angles and azimuth angles is completed by the unmanned aerial vehicle through height change, hovering or flying around. Receiving place test equipment ability, unmanned aerial vehicle auxiliary test system can adjust the flight strategy in a flexible way, satisfies different test requirements, and to the fixed test revolving stage, the aircraft erects the back on the revolving stage, can fly around the revolving stage according to fixed height through unmanned aerial vehicle, tests the antenna performance of all azimuth planes on certain face of pitching, through adjustment flying height, realizes the antenna performance test of different pitch angles. For a two-axis or three-axis rotary table, the unmanned aerial vehicle can adopt a hovering mode, the rotary table rotates through azimuth and pitching to simulate different flight attitudes, the test of the whole antenna is different, the auxiliary test system of the unmanned aerial vehicle is added, the limitation of the capability of the rotary table on the test of the whole antenna is reduced, the performance test of the whole antenna with different azimuth angles and pitching angles is completed, and particularly, the flight height of the unmanned aerial vehicle is flexibly adjusted, and the test state of a large pitching angle can be simulated. By the aid of the unmanned aerial vehicle auxiliary test system, pitching test postures within the range of 0-80 degrees can be simulated, antenna performance tests under the condition of large maneuvering (pitching/rolling maneuvering) are met, and functions of radio frequency links, radio frequency compatibility, radio frequency stealth and the like related to the antenna under the condition of large maneuvering are further verified. Meanwhile, the auxiliary test system of the unmanned aerial vehicle does not need to be configured with a special auxiliary test field and equipment conditions, so that the requirement of the auxiliary end test field is greatly simplified.
According to the invention, through the azimuth/pitching rotation of the rotary table and the hovering/flying around strategy of the unmanned aerial vehicle, the testing capability of the airborne antenna directional diagram in a large-angle range is established, and meanwhile, the problems of overhigh flying height of the unmanned aerial vehicle, attenuation caused by too long testing distance and the like in order to establish a large elevation angle are avoided.
The method is suitable for testing the directional diagram of the large-size airborne and airborne platform antenna, and is particularly suitable for testing the directional diagram of the airborne ultrashort wave omnidirectional antenna under the large-size dynamic condition. Particularly, the directional diagram test of an ultra-short wave antenna directional diagram which is greatly influenced by the installation machine under the condition of large motor-driven condition.
Drawings
Fig. 1 is a schematic block diagram of an unmanned aerial vehicle auxiliary test system built by the invention.
Fig. 2 is a schematic diagram of the antenna pattern test of the unmanned aerial vehicle of fig. 1 under the condition that the unmanned aerial vehicle adopts a fly-around mode to realize a large pitch angle.
Fig. 3 is a schematic diagram of testing an antenna pattern of the unmanned aerial vehicle of fig. 1 under the condition that the unmanned aerial vehicle adopts a hovering mode to realize a large pitch angle.
Detailed Description
See fig. 1. According to the invention, an unmanned aerial vehicle is used for building an auxiliary test terminal ground station terminal of the unmanned aerial vehicle, a differential GPS ground mobile station with an antenna, and an auxiliary test system of the auxiliary unmanned aerial vehicle, wherein the auxiliary test terminal ground station terminal carries out two-way communication with a control center, and the auxiliary test system is provided with an auxiliary test antenna and a signal source, and is characterized in that: the unmanned aerial vehicle airborne GPS antenna respectively sends frequency reference and GPS time to the embedded module and the signal source through the synchronous clock module, the embedded module sends enabling signals generated according to the GPS time and the position input by the airborne flight control system of the auxiliary unmanned aerial vehicle to the signal source, and simultaneously sends the GPS time, the position and waveform data to the airborne data link terminal; the signal source transmits an auxiliary test signal to a to-be-tested airborne antenna of the to-be-tested unmanned aerial vehicle through an auxiliary test antenna erected on the auxiliary unmanned aerial vehicle, so that the transmission of the auxiliary test signal is completed; the ground station terminal utilizes a GPS control module of a differential GPS ground station to complete the real-time position control, data exchange, signal transmission control and synchronization of the auxiliary unmanned aerial vehicle; ground terminal receives auxiliary airborne data link terminal data, and the signal waveform of the transmission of remote control auxiliary unmanned aerial vehicle passes through the vector network analyzer that control center links to each other simultaneously, according to test unmanned aerial vehicle transform height, hover or around flying, and the test of the airborne antenna that awaits measuring of different every single move angles and azimuth angle is accomplished to the flight strategy of the nimble adjustment auxiliary unmanned aerial vehicle of test revolving stage through ground station.
The test system provides an aerial standard signal source for the antenna of the fixed station to be tested, and tests of the antenna directivity pattern are completed. The ground station equipment comprises an antenna to be tested, a receiver, a data acquisition card, a data processing terminal and a differential GPS reference station. The ground station unmanned aerial vehicle remote controller then controls unmanned aerial vehicle's flight.
Example 1
See fig. 2. Unmanned aerial vehicle adopts and hangs in unmanned aerial vehicle lower part omnidirectional antenna, and ground unmanned aerial vehicle observes and controls the omnidirectional antenna of unmanned aerial vehicle height of hovering and position and the unmanned aerial vehicle auxiliary antenna who regards as the auxiliary test end, controls unmanned aerial vehicle transmitting frequency and signal strength through the ground control end, tests the directional diagram of the unmanned aerial vehicle that awaits measuring airborne antenna communication that awaits measuring.
The airborne antenna to be tested is installed on the airborne platform, the test rotary table rotates around the axis, the airborne antenna to be tested is connected with the vector network, the airborne end to be tested adopts the auxiliary test antenna with one-dimensional azimuth rotation, the rotation axis which bypasses the rotation axis and is perpendicular to the table top moves on the circumference as the center, the ground unmanned aerial vehicle measurement and control end controls the hovering height and the position of the unmanned aerial vehicle, the ground station receives signals transmitted by the auxiliary antenna of the unmanned aerial vehicle at all angles, the ground station receives test data, records the relation of field intensity and distance in the airspace, the field intensity value on each test point is used as the reduced calibration parameter, the test data after deviating the track is corrected to the normal track, the center point required when the antenna directional diagram is tested is calculated, the more accurate antenna direction is obtained, and the directional diagram of the antenna to. The airborne to-be-tested end adopts an airborne to-be-tested antenna rotating in a one-dimensional direction, the range of the testing angular domain corresponds to the airborne platform, the pitching angle of the turntable of the airborne to-be-tested end, the flying height of the unmanned aerial vehicle and the hovering height of the unmanned aerial vehicle are adjusted, the directional diagram of the antenna in different angular domains of the whole aerial vehicle is tested, and the antenna directional diagram in the range of 0-80 degrees of pitching in all directions can be realized.
In consideration of GPS precision, the larger the flight radius is, the smaller the relative error is; considering from the radio wave propagation theory, the antenna directivity should be tested in the far field, about 10 wavelengths away; considering the position of a building beside a flight radius area, the flight radius is determined to be 20 meters. The unmanned aerial vehicle is moved to a position (point A) 20 meters away from the antenna, then the unmanned aerial vehicle flies circumferentially around the antenna by taking the point B as a circle center and 20 meters as a radius, and the unmanned aerial vehicle can always keep the antenna radiation main lobe of the airborne signal source aligned to the measured antenna of the fixed station when flying. Controlling and recording the transmitting frequency of the airborne signal source, the GPS time and the geographical position information at certain time intervals; and the receiving end software synchronously controls a spectrum analyzer positioned at the end of the antenna to be measured to read and record the frequency and the GPS time. When the antenna directivity is tested, the software of the transmitting terminal continuously records the GPS time and the position information; and the receiving end software continuously reads and records the level value received by the spectrum analyzer through the measured antenna, fuses the data of the transmitting end and the receiving end and draws a directional diagram of the measured antenna in polar coordinates.
During testing, the unmanned aerial vehicle remote controller controls the unmanned aerial vehicle to fly circumferentially around the antenna to be tested, so that the attitude of the unmanned aerial vehicle is kept, and the main directional lobe of the antenna is always aligned to the antenna to be tested; and then controlling the unmanned aerial vehicle to fly around the antenna in a circle at a fixed radius and at the horizontal position of the main lobe of the radiation directivity of the antenna. The method comprises the steps of simultaneously recording the frequency, the GPS position and the time information of a signal source, selecting and determining a flight track according to factors such as antenna polarization and antenna directional diagram indexes, determining a plurality of elevation angles through a plurality of flights at different heights, completing a vertical plane directional diagram test, synchronizing and analyzing the data of the signal source and the receiver by referring to a GPS time stamp, and drawing a horizontal directional diagram of a receiving antenna.
Example 2
See fig. 3. Unmanned aerial vehicle adopts around flying the mode, and ground station machine carries the machine of waiting to measure the end and adopts the machine of fixed mode to await measuring the antenna, according to satisfying far field condition radius, set for unmanned aerial vehicle as the center to wind according to fixed radius and fly to the revolving stage, control unmanned aerial vehicle flying height, supplementary antenna transmitting frequency and transmitted signal intensity, the unmanned aerial vehicle of simultaneous control loading signal source flies around receiving antenna, through adjustment unmanned aerial vehicle flying height and flying radius, realizes the different angle territory antenna directional diagram tests of complete machine antenna.
The ground station airborne terminal calculates the angle of each point deviating from the main lobe axis of the receiving antenna according to the hovering radius of the unmanned aerial vehicle and the distance between the receiving point and the center point of the hovering circle, then finds out the deviation between the received field intensity value and the field intensity value received in the maximum direction according to the radiation directivity pattern of the used receiving antenna, accumulates the deviation to the field intensity received by the receiving point, uses the field intensity value received by each point on the hovering circle as a normalized calibration parameter, compensates by using the field intensity value as a reference value, corrects and determines a corrected value and performs normalization processing to obtain the flight directional diagram of the antenna phase center and the rotating center placing table. But also greatly reduces errors and flight difficulty caused by various cables.
The present invention has been described in detail with reference to the accompanying drawings, but it is to be understood that the above-described embodiments are only preferred embodiments of the present invention, and not limiting, and it will be apparent to those skilled in the art that various changes and modifications may be made therein, such as extending the testing frequency range of the present invention, and any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, are intended to be included within the scope of the appended claims.
Claims (10)
1. A method for assisting in testing a large-maneuvering-flight-state antenna directional pattern by an unmanned aerial vehicle has the following technical characteristics: utilize unmanned aerial vehicle to build including carrying out bidirectional communication's unmanned aerial vehicle auxiliary test end ground station terminal with control center, have the difference GPS ground mobile station of antenna, erect the unmanned aerial vehicle auxiliary test system who is equipped with auxiliary test antenna, signal source, its characterized in that: the unmanned aerial vehicle airborne GPS antenna respectively sends frequency reference and GPS time to the embedded module and the signal source through the synchronous clock module, the embedded module sends enabling signals generated according to the GPS time and the position input by the airborne flight control system of the auxiliary unmanned aerial vehicle to the signal source, and simultaneously sends the GPS time, the position and waveform data to the airborne data link terminal; the signal source transmits an auxiliary test signal to a to-be-tested airborne antenna of the to-be-tested unmanned aerial vehicle through an auxiliary test antenna erected on the auxiliary unmanned aerial vehicle, so that the transmission of the auxiliary test signal is completed; the ground station terminal utilizes a GPS control module of a differential GPS ground station to complete the real-time position control, data exchange, signal transmission control and synchronization of the auxiliary unmanned aerial vehicle; ground terminal receives supplementary airborne data link terminal data, and the signal waveform of the supplementary unmanned aerial vehicle transmission of remote control simultaneously through the vector network analyzer that control center links to each other, according to test unmanned aerial vehicle transform height, hover or around flying, the test revolving stage through the ground station is nimble adjusts supplementary unmanned aerial vehicle's flight strategy, accomplishes the directional diagram test of the airborne antenna that awaits measuring of different every single move angles and azimuth.
2. The method for assisting testing of a large airborne state antenna pattern by a drone of claim 1, wherein: unmanned aerial vehicle adopts the mode of hovering, observes and controls the end through ground unmanned aerial vehicle, controls unmanned aerial vehicle height and position of hovering, and as the unmanned aerial vehicle auxiliary antenna of supplementary test end, adopt omnidirectional antenna to hang in the unmanned aerial vehicle lower part, through ground control end, control unmanned aerial vehicle transmitting frequency and signal strength.
3. The method for assisting testing of a large airborne state antenna pattern by a drone of claim 1, wherein: the antenna to be measured is installed on the airborne platform and is connected with the vector network, and the signal transmitted by the auxiliary antenna at the auxiliary end of the unmanned aerial vehicle is received.
4. The method for assisting testing of a large airborne state antenna pattern by a drone of claim 1, wherein: the unmanned aerial vehicle survey antenna is installed on an airborne platform, a test rotary table rotates around the axis of rotation, the phase center of the airborne antenna to be tested coincides with the rotation center of the test rotary table, the airborne antenna to be tested is connected with a vector network, the airborne terminal to be tested adopts an auxiliary test antenna rotating in a one-dimensional direction, the airborne antenna moves on a circle taking the rotation axis which bypasses the rotation axis and is perpendicular to the table board as the center, a ground station receives signals transmitted by the auxiliary terminal auxiliary antenna of the unmanned aerial vehicle at all angles, the ground station receives test data, records the relation of field intensity and distance in the airspace, field intensity values on all test points serve as the normalized calibration parameters, the test data after deviating the track are corrected to a normal track, the center point meeting the requirements of an antenna directional diagram during testing is calculated, the accurate antenna direction is obtained, and the.
5. The method for assisting testing of a large airborne state antenna pattern by a drone of claim 1, wherein: the airborne to-be-tested end adopts an airborne to-be-tested antenna rotating in a one-dimensional direction, the range of the testing angular domain corresponds to the airborne platform, the pitching angle of the turntable of the airborne to-be-tested end, the flying height of the unmanned aerial vehicle and the hovering height of the unmanned aerial vehicle are adjusted, antenna directional diagrams of the whole airborne antenna in different angular domains are tested, and antenna directional diagrams in the range of 0-80 degrees of pitching in all directions are realized.
6. The method for assisting testing of a large airborne state antenna pattern by a drone of claim 1, wherein: unmanned aerial vehicle adopts and hangs in unmanned aerial vehicle lower part omnidirectional antenna, and ground unmanned aerial vehicle observes and controls the omnidirectional antenna of unmanned aerial vehicle height of hovering and position and the unmanned aerial vehicle auxiliary antenna who regards as the auxiliary test end, controls unmanned aerial vehicle transmitting frequency and signal strength through the ground control end, tests the directional diagram of the unmanned aerial vehicle that awaits measuring airborne antenna communication that awaits measuring.
7. The method for assisting testing of a large airborne state antenna pattern by a drone of claim 1, wherein: the unmanned aerial vehicle survey antenna is installed on airborne platform, and the test revolving stage is rotatory around the axle center, and the phase place center of the airborne antenna that awaits measuring coincides with the rotation center of test revolving stage, with vector net connection, the airborne end of awaiting measuring adopts the rotatory auxiliary test antenna in one-dimensional position, moves on the circumference of revolving center and perpendicular to mesa rotation axis as the heart.
8. The method for assisting testing of a large airborne state antenna pattern by a drone of claim 1, wherein: the ground unmanned aerial vehicle observes and controls end control unmanned aerial vehicle height and position of hovering, the ground station receives the signal of launching on each angle of unmanned aerial vehicle auxiliary end auxiliary antenna, the ground station receives test data, note field intensity-distance relation on this airspace, regard the field intensity numerical value on each test point as the calibration parameter of reducing, revise the test data after the skew orbit to the normal orbit, the centre of a circle point that requires when calculating and satisfying the test of antenna directional diagram, obtain more accurate antenna direction, draw out the directional diagram of the antenna that awaits measuring.
9. The method for assisting testing of a large airborne state antenna pattern by a drone of claim 1, wherein: unmanned aerial vehicle adopts around flying the mode, and ground station machine carries the machine of waiting to measure the end and adopts the machine of fixed mode to await measuring the antenna, according to satisfying far field condition radius, set for unmanned aerial vehicle as the center to wind according to fixed radius and fly to the revolving stage, control unmanned aerial vehicle flying height, supplementary antenna transmitting frequency and transmitted signal intensity, the unmanned aerial vehicle of simultaneous control loading signal source flies around receiving antenna, through adjustment unmanned aerial vehicle flying height and flying radius, realizes the different angle territory antenna directional diagram tests of complete machine antenna.
10. The method for assisting testing of a large airborne state antenna pattern by a drone of claim 1, wherein: the ground station airborne terminal calculates the angle of each point deviating from the main lobe axis of the receiving antenna according to the hovering radius of the unmanned aerial vehicle and the distance between the receiving point and the center point of the hovering circle, then finds out the deviation between the received field intensity value and the field intensity value received in the maximum direction according to the radiation directivity pattern of the used receiving antenna, accumulates the deviation to the field intensity received by the receiving point, uses the field intensity value received by each point on the hovering circle as a normalized calibration parameter, compensates by using the field intensity value as a reference value, corrects and determines a corrected value and performs normalization processing to obtain the flight directional diagram of the antenna phase center and the rotating center placing table.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111948465A (en) * | 2020-07-30 | 2020-11-17 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Airborne ultrashort wave antenna directional diagram UAV auxiliary test system |
| CN114184852A (en) * | 2021-11-30 | 2022-03-15 | 南京理工大学 | Antenna directional pattern active and passive combined type measuring system based on aerial platform |
| CN117388588A (en) * | 2023-12-11 | 2024-01-12 | 中国电子科技集团公司第二十九研究所 | Engineering measurement system of VHF or UHF frequency band wide beam antenna pattern |
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