CN116528172A - Civil aviation very high frequency ground-air communication anti-interference method integrating secondary radar information - Google Patents
Civil aviation very high frequency ground-air communication anti-interference method integrating secondary radar information Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/86—Combinations of radar systems with non-radar systems, e.g. sonar, direction finder
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
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Abstract
The invention relates to the technical field of civil aviation communication, and discloses a civil aviation very high frequency ground-air communication anti-interference method integrating secondary radar information, which comprises the following steps: estimating the first current position information of the moving target by utilizing DOA technology; calculating target position information of a moving target at the next moment in real time based on current position information of the moving target and combining the heading and speed of the moving target provided by a secondary radar, establishing a first polar coordinate system by taking the secondary radar as an origin, and converting a first polar coordinate of the moving target in the first polar coordinate system into a second polar coordinate under an array antenna coordinate system; fusing the target position information and the real-time position information at the same moment to obtain the final position information of the moving target; and combining the final position information with an adaptive beam forming technology to achieve the purposes of enhancing and resisting interference of the moving target signal. The method and the device greatly improve the instantaneity and the accuracy of the position estimation of the moving target in the anti-interference process of the civil aviation very high frequency ground-air communication.
Description
Technical Field
The invention relates to the technical field of civil aviation communication, in particular to a civil aviation very high frequency ground-air communication anti-interference method integrating secondary radar information.
Background
The communication between the ground and the air of the civil aviation very high frequency is an important communication means between the ground tower of the civil aviation very high frequency and the airplane. The civil aviation very high frequency ground-air communication system takes a ground station as a center to cover a certain area, if an omnidirectional antenna is adopted, the system is enabled to cover any direction, all signals in a coverage space are received without selection when signals are received, the signals comprise target signals and interference signals, the signal intensity is dispersed, the signals are emitted in an omnidirectional mode, the radiation efficiency in the target direction is low, and the nearby electromagnetic environment is polluted; the intelligent antenna can realize the directional radiation and the reception of wireless signals, not only can effectively enhance target signals, reduce the transmitting power and reduce electromagnetic environment pollution, but also can effectively inhibit non-target signals, thereby achieving the purpose of anti-interference.
The intelligent antenna mainly adopts an array antenna, and achieves the purposes of target signal enhancement and interference resistance through a signal arrival angle estimation technology (Direction of arrive, DOA) and a Beam Forming technology (BF), wherein the DOA is a technology for estimating the position of an information source by utilizing time, frequency or space information of transmitting signals to known antenna array elements, and belongs to one of spectrum estimation technologies; the self-adaptive wave beam forming technology is to self-adaptively weight each antenna on an array element by utilizing a self-adaptive algorithm, so that a main lobe of an antenna pattern is aligned with a signal transmitting direction, a side lobe is reduced, and a zero point is aligned with an interference direction, thereby improving the antenna gain, reducing the interference, improving the signal to noise ratio and improving the communication distance.
A schematic view of a scene of the intelligent antenna applied in the civil aviation very high frequency ground-air communication system is shown in fig. 5, signals received by the array antenna come from different directions, including target signals and interference signals, the array antenna firstly obtains position information of each incident signal through DOA estimation, and then a certain target signal is enhanced and signals in other directions are weakened through an adaptive beam forming technology.
Because the moving speed is still relatively high in the process of taking off and landing of the aircraft, a certain time is needed for scanning the array antenna for one circle, and the civil aviation very high frequency ground-air communication is burst communication, two main problems are faced when the intelligent antenna is applied to the civil aviation very high frequency ground-air communication system: the first problem is that the real-time performance of the DOA estimated fast moving target position is not ideal, the beam forming effect is affected, and the purposes of fast moving target signal enhancement and interference resistance are not achieved; the second problem is that burst communication delay is large, ground-air communication instantaneity is poor, and civil aviation flight safety is possibly affected.
Disclosure of Invention
The invention provides a civil aviation very high frequency ground-air communication anti-interference method integrating secondary radar information, which can solve the problems that when an intelligent antenna is applied to a civil aviation very high frequency ground-air communication system, the real-time performance of a target position estimated by DOA (data of arrival) is not ideal, the enhancement and anti-interference effects of a fast moving target signal are affected, the burst communication delay is large, and the safety of the civil aviation flight is possibly affected due to factors such as high moving speed of an airplane, slow estimated target position of an array antenna and the like.
The invention is realized by the following technical scheme:
a civil aviation very high frequency ground-air communication anti-interference method integrating secondary radar information comprises the following steps:
s1, predicting the first current position information of a moving target by utilizing a DOA technology;
s2, calculating target position information of the moving target at the next moment in real time by combining the heading and speed of the moving target provided by a secondary radar, and simultaneously, establishing a first polar coordinate system by taking the secondary radar as an origin, and converting a first polar coordinate of the moving target in the first polar coordinate system into a second polar coordinate under an array antenna coordinate system, wherein the current position information of the moving target comprises first current position information of the moving target and position information of a first position of the moving target when the target position information needs to be calculated in the moving process, and the position information of the first position is the target position information calculated at the last moment relative to the 'when the target position information needs to be calculated';
s3, acquiring a first polar coordinate of the moving target through a secondary radar, and converting the first polar coordinate into a second polar coordinate relative to the array antenna in a S2 mode to obtain real-time position information of the moving target relative to the array antenna;
s4, fusing the target position information and the real-time position information which belong to the same moment to obtain final position information of the moving target;
s5, combining final position information of the moving target with a self-adaptive beam forming technology to enable a main lobe of an array antenna pattern to be always aligned with the moving target, and enabling a zero point to be always aligned with an interference signal direction, so that the purposes of signal enhancement and interference resistance of the moving target are achieved.
As an optimization, the secondary radar and the array antenna belong to the same empty pipe system.
As optimization, in S2, based on the current position information of the moving target, the specific process of calculating the target position information of the moving target at the next moment in real time by combining the heading and speed of the moving target provided by the secondary radar is as follows:
in the array antenna coordinate system, the current position information of the moving target is taken as a starting point, the moving distance of the moving target is obtained according to the combination of the speed of the moving target obtained by the secondary radar and the time length reaching the next moment, and the coordinates of the starting point are combined with the course and the moving distance of the moving target to obtain the end point of the moving target in the array antenna coordinate system, wherein the end point is the target position information of the moving target at the next moment.
As optimization, a first polar coordinate system is established by taking a secondary radar as an origin, and the specific process of converting a first polar coordinate of the moving target in the first polar coordinate system into a second polar coordinate under an array antenna coordinate system is as follows:
s2.1, taking the secondary radar as a pole, establishing a first polar coordinate system, and simultaneously taking a middle antenna unit of the array antenna as a pole, and establishing an array antenna polar coordinate system, wherein the first polar coordinate system and x-axis, y-axis and z-axis of the array antenna coordinate system are consistent with a spherical coordinate system;
s2.2, on the premise that the spherical center coordinates of the array antenna and the secondary radar are known, the first polar coordinates of the moving target which are known under the secondary radar are obtainedConverting the first right-angle coordinates into a first space right-angle coordinate system established by taking the position of the secondary radar as an origin, and obtaining the spherical center coordinates of the moving target according to the first right-angle coordinates of the moving target and the spherical center coordinates of the secondary radar in the spherical coordinate system;
s2.3, establishing a second space rectangular coordinate system with the direction identical to that of the first space rectangular coordinate system by taking the position of the center of the array antenna as an origin, solving a second rectangular coordinate of the moving object in the second space rectangular coordinate system based on the spherical center coordinate of the moving object, and then converting the second rectangular coordinate of the moving object into a second polar coordinate in the polar coordinate system of the array antenna with the position of the center of the array antenna as a pole, wherein the second polar coordinate is real-time position information of the moving object relative to the array antenna.
As an optimization, a first rectangular coordinate of the moving object in a first space rectangular coordinate system with a secondary radar as an originThe specific formula is as follows:
；
wherein the first polar coordinate of the moving object is，/>，hRepresenting the vertical distance of the moving object to the ground in a spherical coordinate system, +.>，/>A first curvature radius of a unitary mortise circle at a point where a secondary radar is located; />Is the first eccentricity of the earth's ellipse,ais the major axis radius of the earth,bis the minor axis radius of the earth>For secondary radar latitude>Representing the polar angle of the moving object in the first polar coordinate system, < >>Representing the polar path of the moving object in the first polar coordinate system.
As optimization, the specific formula of the spherical center coordinates of the moving target is as follows:
；
wherein ,for the spherical center coordinates of the moving object, < > for>For the sphere center coordinates of the secondary radar, < >>A first rectangular coordinate of the moving target in a first space rectangular coordinate system with the secondary radar as an origin, a represents the moving target, and P represents the secondary radar.
As an optimization, a second rectangular coordinate of the moving object of a second space rectangular coordinate system with the center of the array antenna as an origin is expressed as follows:
；
wherein ,for the spherical center coordinates of the moving object, < > for>For the centre of sphere coordinates of the centre point of the array antenna,/->Represents the center point of the array antenna, < >>，，/>Representing a second radius of curvature of a unitary circle at a center point of the array antenna, ++>Is thatQLatitude of point->Is the first eccentricity of the earth's ellipse,ais the major axis radius of the earth,bis the minor axis radius of the earth.
As optimization, the polar diameter of the moving target in the polar coordinate system of the array antennaThe specific expression of (2) is:
。
as optimization, the polar angle of the moving target in the polar coordinate system of the array antennaThe expression of (2) is:
。
as optimization, in S4, an arithmetic average calculation is performed on the coordinates corresponding to the target position information and corresponding to the second polar coordinates corresponding to the real-time position information, where the calculated average coordinates are final coordinates corresponding to the array antenna, that is, final position information of the moving target.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the method, the position information of the target at the next moment is calculated in real time by utilizing the position information estimated by the first DOA and combining the heading and the speed provided by the secondary radar, so that DOA estimation is not needed each time, the target position estimation speed is greatly improved, and the real-time performance and the accuracy of target position estimation in the civil aviation very high frequency ground-air communication anti-interference process are greatly improved;
according to the method, a polar coordinate system is established by taking the secondary radar as the center of a circle, under the premise that the position of the array antenna and the position of the secondary radar are known, the polar coordinate of a target under the secondary radar can be converted into the spherical center coordinate first and then into the polar coordinate under the array antenna, so that real-time position information of the target relative to the array antenna can be calculated in real time, and then, in order to further improve the accuracy of fast moving target position estimation, the real-time position information obtained in the two aspects is subjected to data fusion, namely average processing, so that more accurate target position information is obtained, and the effect of real-time tracking of the fast moving target is achieved.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are needed in the examples will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and that other related drawings may be obtained from these drawings without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a flow chart of an implementation of a civil aviation very high frequency ground-air communication anti-interference method integrating secondary radar information;
FIG. 2 is a graph of signal enhancement effects obtained using the method of the present invention;
FIG. 3 is a graph of anti-interference effect using the method of the present invention;
FIG. 4 is a schematic diagram of a shift target position;
fig. 5 is a schematic view of a scenario in which a smart antenna is applied to a civil aviation very high frequency ground-air communication system.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
The secondary radar and the very high frequency ground-air communication are important components of the civil aviation air traffic control system, the information of the aircraft heading, speed, position and the like obtained by the secondary radar can be transmitted to the very high frequency ground-air communication subsystem by means of the air traffic control system through a high-speed communication interface, and the secondary radar and the very high frequency ground-air communication subsystem belong to the same air traffic control system, so that the secondary radar and the very high frequency ground-air communication subsystem (namely the intelligent antenna) achieve time synchronization. On the basis, aiming at the two problems, in the civil aviation very high frequency ground-air communication anti-interference method integrating the secondary radar information, as shown in fig. 1, firstly, the intelligent antenna integrates the secondary radar information to perform real-time position estimation on a fast moving target, then, the fast moving target signal is enhanced and interference (namely signals in other directions) is weakened through a self-adaptive beam forming technology by combining with the high-precision high-real-time fast moving target position information, so that the purposes of enhancing and anti-interference of the fast moving target signal are achieved, and the civil aviation flight safety level is improved. The method (S1-S4) for estimating the position of the fast moving target by fusing secondary radar information through the intelligent antenna is the key point of the method and the key description of the scheme, and the adaptive beam forming technology is a conventional method (S5 of the following steps), so that the method is not described in detail.
S1, predicting the first current position information of a moving target by utilizing a DOA technology; the moving object to which the present invention refers is a device that flies on the sky, such as an aircraft.
S2, calculating target position information of the moving target at the next moment in real time based on the current position information of the moving target and combining the course and the speed of the moving target provided by a secondary radar, wherein the current position information of the moving target comprises first current position information of the moving target and position information of a first position of the moving target when the target position information needs to be calculated in the moving process, and the position information of the first position is the target position information calculated at the last moment relative to the 'when the target position information needs to be calculated', and the calculating process is specifically as follows: in the array antenna coordinate system, the current position information of the moving target is taken as a starting point, the moving distance of the moving target is obtained according to the combination of the speed of the moving target obtained by the secondary radar and the time length reaching the next moment, and the coordinates of the starting point are combined with the course and the moving distance of the moving target to obtain the end point of the moving target in the array antenna coordinate system, wherein the end point is the target position information of the moving target at the next moment. When a certain calculation is performed, the target position information obtained by the last calculation is regarded as the current position information of the calculated target position information of the time, for example, the A time, A is a positive integer not less than 2, and the target position information obtained by the (A-1) time is regarded as the current position information of the A time calculation.
Meanwhile, a first polar coordinate system is established by taking a secondary radar as an origin, and a first polar coordinate of the moving target in the first polar coordinate system is converted into a second polar coordinate under an array antenna coordinate system;
the specific process is as follows:
s2.1, taking the secondary radar as a pole, establishing a first polar coordinate system, and simultaneously taking a middle antenna unit of the array antenna as a pole, and establishing an array antenna polar coordinate system, wherein the first polar coordinate system and x-axis, y-axis and z-axis of the array antenna coordinate system are consistent with a spherical coordinate system;
s2.2, converting a first polar coordinate of the moving target in a first polar coordinate system into a spherical center coordinate on the premise that the position of the array antenna and the position of the secondary radar are known;
s2.3, converting the spherical center coordinate into a second polar coordinate under the array antenna coordinate system, wherein the second polar coordinate is real-time position information of the moving target relative to the array antenna.
When the intelligent antenna is applied to a civil aviation very high frequency ground-air communication system, the position information of a moving target relative to a secondary radar is converted into the position information of a relative array antenna through the following process.
Knowing the position of the secondary radar and the array antenna, a polar coordinate system is established with the secondary radar as the origin, and the aircraft A is assumed to be a moving target, as shown in FIG. 4, at the known array antenna position（ wherein />、/> and />Sphere center coordinates for) and secondary radar position +.>（ wherein />、/> and />Is thatPPolar coordinate of aircraft A under secondary radar +.>Can be converted into the sphere center coordinate +.>Then converts to polar A +.>。/>Representing a polar angle of the moving object in the first polar coordinate system, namely an included angle between a projection point of the moving object on an xy plane of the spherical coordinate system and a projection point of the secondary radar on the xy plane of the spherical coordinate system and a ray which takes the projection point as a starting point and is parallel to the y axis direction; />Representing the polar diameter of a moving object, i.e. the distance length of the moving object to the secondary radar,hrepresenting the vertical distance of the moving object to the ground in a spherical coordinate system.
Assuming that the major axis radius of the earth isaShort axis radius ofbThe secondary radar latitude is, then the first curvature radius of the unitary circleCan be expressed as:
；
wherein ,is the first eccentricity of the earth ellipse.
In S2.2, aircraft A is first given a first polar coordinate known under secondary radarConversion to secondary radarPA first space rectangular coordinate system established by taking the position as the originIs>The method comprises the steps of carrying out a first treatment on the surface of the Secondary radarPThe position is the origin, throughPThe weft direction of the point is x-axis, the warp direction is y-axis, the zenith direction is z-axis, and a first space rectangular coordinate system is established, and then the coordinates of the plane A in the first space rectangular coordinate system can be expressed as follows:
；
wherein ,；
then the center of sphere coordinates of aircraft a can be expressed as:
；
s2.3, after obtaining the spherical coordinates of the moving object A, firstly using the position of the center Q of the array antenna as the origin, establishing a second space rectangular coordinate system with one direction identical to the first space rectangular coordinate system, obtaining the second rectangular coordinates of the moving object A in the second space rectangular coordinate system, specifically, using the position of the center Q of the array antenna as the origin, the weft direction passing through the Q point as the x-axis, the warp direction as the y-axis and the zenith direction as the z-axis, and establishing the second space rectangular coordinate system, then the second rectangular coordinates of the second space rectangular coordinate system of the plane ACan be expressed as:
；
wherein ,；/>representing the polar angle of the moving object under the polar coordinate system of the array antenna, namely the included angle between the projection point of the moving object on the xy plane of the spherical coordinate system and the projection point of the center of the array antenna on the xy plane of the spherical coordinate system and the ray which takes the projection point as the starting point and is parallel to the y axis direction; />Representing the polar diameter of a moving object, i.e. the length of the distance of the moving object from the center of the array antenna,hrepresenting the vertical distance of the moving object to the ground in a spherical coordinate system;> a second radius of curvature that is a unitary circle of mortise at the point;
the second radius of curvature of the unitary mortise circle at point Q may be expressed as:
； wherein ,/>Is thatQLatitude of the point.
3 equations 3 unknownsIt can be solved that:
；
thereby obtaining the second polar coordinate of the plane A under the polar coordinate system under the array antennaThe position information of the aircraft A under the air traffic control secondary radar is converted into real-time position information under the array antenna.
S3, acquiring a first polar coordinate of the moving target through a secondary radar, and converting the first polar coordinate into a second polar coordinate relative to the array antenna in a S2 mode to obtain real-time position information of the moving target relative to the array antenna;
at a certain moment, the secondary radar acquires a first polar coordinate of the moving target and converts the first polar coordinate into a second polar coordinate of the array antenna, so that real-time position information of the moving target relative to the array antenna at the moment is obtained.
S4, fusing the target position information and the real-time position information which belong to the same moment to obtain final position information of the moving target;
and calculating an arithmetic average value of the target position information of the moment calculated at the last moment of the moment and the real-time position information obtained by the secondary radar of the moment to obtain final position information. For example, a moment is defined asThe last moment is defined as +.>By->The heading and speed of the moving target obtained by combining the current position of the moving target at the moment with the secondary radar are obtained +.>The target position information of the moving target relative to the array antenna at the moment, it should be noted that the first time the current position of the moving target is obtained is by DOA technology, i.e. < ->Is the initial time, then->The current position of the moving target at the moment is obtained through DOA technology; the current position information required for calculating the target position of the moving target at the next moment every time is the movement obtained by combining the secondary radarThe course and speed of the moving object are calculated, if +.>Not the initial time, then->The current position of the moving object at the moment is determined by the moving object at the previous moment +.>And the position relative to the array antenna is calculated by combining the heading and the speed of the moving target obtained by the secondary radar.
S5, combining the final position information of the positioned moving target with a self-adaptive beam forming technology to enable the main lobe of the array antenna directional diagram to be always aligned with the moving target, and enabling the zero point to be always aligned with the direction of the interference signal, so that the purposes of signal enhancement and interference resistance of the moving target are achieved. In general, the key point of the invention is that the intelligent antenna fuses the secondary radar information to carry on the method of real-time position estimation to the fast moving target, on one hand, utilize the position information of the first DOA estimation, combine course, speed that the secondary radar provides, calculate the position information of the target at the next moment in real time, and does not need to carry on DOA estimation each time, has raised the estimated speed of the target position greatly; on the other hand, when the intelligent antenna is applied to a civil aviation very high frequency ground-air communication system, the positions of the secondary radar and the array antenna are known, then a polar coordinate system is established by taking the secondary radar as the center of a circle, and on the premise that the position of the array antenna and the position of the secondary radar are known, the polar coordinate of a target under the secondary radar can be converted into a spherical center coordinate and then into the polar coordinate under the array antenna, so that the real-time position information of the target relative to the array antenna can be calculated in real time. Then, in order to further improve the accuracy of the fast moving target position estimation, the real-time position information obtained in the two aspects is subjected to data fusion, namely average processing, so that more accurate target position information is obtained, and the effect of real-time tracking of the fast moving target is achieved. Finally, combining with the high-precision and high-real-time fast moving target position information, enhancing the fast moving target signal and weakening the interference (i.e. signals in other directions) by a self-adaptive beam forming technology, thereby achieving the purposes of enhancing the fast moving target signal and resisting the interference and improving the safety level of civil aviation flight. The estimated target position information in two aspects is obtained through real-time calculation and is processed by a high-speed processor, so that the delay is very small, the fast moving target position information after data fusion is high in precision and real-time performance, on the basis, the main lobe of an antenna pattern is always aligned to a moving target through a beam forming technology, side lobes are reduced, and zero points are simultaneously aligned to interference, the two problems are solved, and for an expected fast moving target signal, the output signal to noise ratio is increased along with the increase of the input signal to noise ratio, as shown in fig. 2, the purpose of enhancing the fast moving target signal is achieved; for the interference signal, the interference rejection ratio is also increased along with the increase of the input signal to noise ratio, so that the purpose of anti-interference is achieved, as shown in fig. 3.
The foregoing description of the preferred embodiments of the present invention will provide further details of the objects, aspects and advantages of the present invention, and it should be understood that the foregoing description is merely illustrative of the present invention and is not intended to limit the scope of the invention, since various modifications, equivalent substitutions, improvements, and any process according to the invention in the same form or based on this form will fall within the spirit and principles of the invention.
Claims (10)
1. A civil aviation very high frequency ground-air communication anti-interference method integrating secondary radar information is characterized by comprising the following steps:
s1, predicting the first current position information of a moving target by utilizing a DOA technology;
s2, calculating target position information of the moving target at the next moment in real time by combining the heading and speed of the moving target provided by a secondary radar, and simultaneously, establishing a first polar coordinate system by taking the secondary radar as an origin, and converting a first polar coordinate of the moving target in the first polar coordinate system into a second polar coordinate under an array antenna coordinate system, wherein the current position information of the moving target comprises first current position information of the moving target and position information of a first position of the moving target when the target position information needs to be calculated in the moving process, and the position information of the first position is the target position information calculated at the last moment relative to the 'when the target position information needs to be calculated';
s3, acquiring a first polar coordinate of the moving target through a secondary radar, and converting the first polar coordinate into a second polar coordinate relative to the array antenna in a S2 mode to obtain real-time position information of the moving target relative to the array antenna;
s4, fusing the target position information and the real-time position information which belong to the same moment to obtain final position information of the moving target;
s5, combining final position information of the moving target with a self-adaptive beam forming technology to enable a main lobe of an array antenna pattern to be always aligned with the moving target, and enabling a zero point to be always aligned with an interference signal direction, so that the purposes of signal enhancement and interference resistance of the moving target are achieved.
2. The civil aviation very high frequency ground-air communication anti-interference method integrating secondary radar information according to claim 1, wherein the secondary radar and the array antenna belong to the same empty pipe system.
3. The civil aviation very high frequency ground-air communication anti-interference method integrating secondary radar information according to claim 2, wherein in S2, based on the current position information of the moving target, the specific process of calculating the target position information of the next moment of the moving target in real time by combining the heading and speed of the moving target provided by the secondary radar is as follows:
in the array antenna coordinate system, the current position information of the moving target is taken as a starting point, the moving distance of the moving target is obtained according to the combination of the speed of the moving target obtained by the secondary radar and the time length reaching the next moment, and the coordinates of the starting point are combined with the course and the moving distance of the moving target to obtain the end point of the moving target in the array antenna coordinate system, wherein the end point is the target position information of the moving target at the next moment.
4. The civil aviation very high frequency ground-air communication anti-interference method integrating secondary radar information according to claim 2, wherein a first polar coordinate system is established by taking a secondary radar as an origin, and the specific process of converting a first polar coordinate of the moving target in the first polar coordinate system into a second polar coordinate under an array antenna coordinate system is as follows:
s2.1, taking the secondary radar as a pole, establishing a first polar coordinate system, and simultaneously taking a middle antenna unit of the array antenna as a pole, and establishing an array antenna polar coordinate system, wherein the first polar coordinate system and x-axis, y-axis and z-axis of the array antenna coordinate system are consistent with a spherical coordinate system;
s2.2, on the premise that the spherical center coordinates of the array antenna and the secondary radar are known, the first polar coordinates of the moving target which are known under the secondary radar are obtainedConverting the first right-angle coordinates into a first space right-angle coordinate system established by taking the position of the secondary radar as an origin, and obtaining the spherical center coordinates of the moving target according to the first right-angle coordinates of the moving target and the spherical center coordinates of the secondary radar in the spherical coordinate system;
s2.3, establishing a second space rectangular coordinate system with the direction identical to that of the first space rectangular coordinate system by taking the position of the center of the array antenna as an origin, solving a second rectangular coordinate of the moving object in the second space rectangular coordinate system based on the spherical center coordinate of the moving object, and then converting the second rectangular coordinate of the moving object into a second polar coordinate in the polar coordinate system of the array antenna with the position of the center of the array antenna as a pole, wherein the second polar coordinate is real-time position information of the moving object relative to the array antenna.
5. The method for resisting interference in civil aviation very high frequency ground-air communication by integrating secondary radar information according to claim 4, wherein the first rectangular coordinates of the moving target in the first space rectangular coordinate system with the secondary radar as the originThe specific formula is as follows:
；
wherein the first polar coordinate of the moving object is，/>，hRepresenting the vertical distance of the moving object to the ground in a spherical coordinate system, +.>The first curvature radius of a mortise unitary circle at the point of the secondary radar; />Is the first eccentricity of the earth's ellipse,ais the major axis radius of the earth,bis the minor axis radius of the earth>For secondary radar latitude>Representing the polar angle of the moving object in the first polar coordinate system, < >>Representing the pole of a moving object in a first polar coordinate systemAnd (3) diameter.
6. The civil aviation very high frequency ground-air communication anti-interference method integrating secondary radar information according to claim 5, wherein the specific formula of the spherical center coordinates of the moving target is:
；
wherein ,for the spherical center coordinates of the moving object, < > for>As the coordinates of the sphere center of the secondary radar,a first rectangular coordinate of the moving target in a first space rectangular coordinate system with the secondary radar as an origin, a represents the moving target, and P represents the secondary radar.
7. The civil aviation very high frequency ground-air communication anti-interference method integrating secondary radar information according to claim 6, wherein the second rectangular coordinates of the moving object of the second space rectangular coordinate system using the center of the array antenna as the origin are expressed as:
；
wherein ,for the spherical center coordinates of the moving object, < > for>For the centre of sphere coordinates of the centre point of the array antenna,/->Represents the center point of the array antenna, < >>，；/>Representing a second radius of curvature of a unitary circle at a center point of the array antenna, ++>Is thatQLatitude of point->Is the first eccentricity of the earth's ellipse,ais the major axis radius of the earth,bis the minor axis radius of the earth>For the polar diameter of the moving target in the polar coordinate system of the array antenna, < >>And a polar angle of the moving target in the polar coordinate system of the array antenna is obtained.
8. The civil aviation very high frequency ground-air communication anti-interference method integrating secondary radar information according to claim 7, wherein the polar diameter of the moving target in the polar coordinate system of the array antenna is as followsThe specific expression of (2) is:
。
9. the method for anti-interference of civil aviation very high frequency ground-air communication integrated with secondary radar information according to claim 8, wherein the polar angle of the moving target in the polar coordinate system of the array antenna is as followsThe expression of (2) is:
。
10. the civil aviation very high frequency ground-air communication anti-interference method integrating secondary radar information according to claim 1, wherein in S4, arithmetic average calculation is performed on the coordinates corresponding to the target position information and corresponding to the second polar coordinates corresponding to the real-time position information, and the calculated average coordinates are final coordinates corresponding to the array antenna, namely the final position information of the moving target.
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