A method and apparatus for interference source direction finding

Abstract

The application discloses a method and device for directing an interference source. First, a first scanning path is planned according to the spatial range of an antenna, and then it is determined whether multiple antenna orientations in the scanning path satisfy a symmetry condition. If yes, a next scanning path is planned according to the multiple antenna orientations, and if no, a next scanning path is planned according to the antenna orientation of the maximum signal strength in the first scanning path. After the path scanning, it is continuously determined whether multiple antenna orientations satisfy the symmetry condition. In the case that the antenna orientations satisfy a scanning search convergence condition, the antenna orientation is taken as the direction of the interference source. By using the feature that the spherical center projection center of a parabolic antenna directional diagram is symmetrical, the scanning path is planned, sparse scanning in a specified spatial range is realized, the direction of the strongest interference signal amplitude is quickly converged, and the direction of the interference source is determined in a short time.

Description

Technical Field

[0001] This application relates to the field of interference sensing, and more specifically, to a method and apparatus for locating interference sources. Background Technology

[0002] In wireless telemetry and communication systems, signal receiving equipment faces both intentional and unintentional interference. Intentional interference includes repeater-type interference and deliberate interference, while unintentional interference includes co-channel interference and natural electromagnetic interference. Co-channel interference includes interference from 4G / 5G base stations, low-Earth orbit satellites, and high-Earth orbit satellites. Natural electromagnetic interference includes interference from industrial equipment and lightning. If interference in the environment reaches a certain intensity, it will affect the normal operation of the system. Therefore, interference source localization can effectively eliminate and identify the causes of performance degradation during system operation, and can also select the system's operating frequency band and examine the security of key airspaces. In addition, interference source localization can also understand the interference sources around the system deployment location, providing effective support for the system's task execution and anti-interference capabilities.

[0003] Interference source direction finding techniques are mainly divided into amplitude comparison methods and phase comparison methods. Amplitude comparison methods can be further divided into maximum signal method, minimum signal method, amplitude comparison method, and comprehensive method, etc. Phase comparison methods can be divided into interferometer direction finding system, correlation interferometer direction finding system, time difference of arrival direction finding system, and spatial spectrum estimation direction finding system, etc. The specific direction finding techniques are selected according to the characteristics of the actual system.

[0004] Facilities such as satellite communication ground stations and aerospace telemetry and control ground stations, due to long-distance communication, need to ensure EIRP and G / T performance indicators. They typically use large-aperture parabolic antennas for signal transmission and reception to direct interference sources. Large-aperture parabolic antennas have advantages such as narrow main lobe beams, slow rotation speed, and symmetrical radiation patterns projected from the center of the sphere. However, this method presents several problems. For example, firstly, the antenna beam is highly directional, making the maximum signal direction finding method suitable only for single antennas; amplitude comparison, synthesis, and phase comparison methods are not applicable. Secondly, the extremely narrow antenna beam necessitates maneuvering the direction to perform spatial scanning for interference source direction finding. Thirdly, large-area spatial scanning is time-consuming, requiring optimization of the scanning path.

[0005] For large-aperture parabolic antennas to locate interference sources, common mechanical scanning methods include linear scanning, spiral rectangular scanning, spiral scanning, grating rectangular scanning, circular scanning, and Lissajous scanning. However, all of these methods require a full-coverage scan of the entire airspace to locate the interference source when the probability of its spatial distribution is unknown. Given the constraint of directional accuracy, completing the full-airspace coverage scan requires a significant amount of time, which can impact the execution of normal telemetry and communication tasks. Summary of the Invention

[0006] The purpose of this application is to overcome the shortcomings of existing technologies and provide a method and apparatus for directional interference sources. By rationally planning the path scanning, the time for directional interference sources of parabolic antennas can be shortened, efficiency can be improved, and the execution of normal communication or telemetry and control tasks can be avoided.

[0007] The objective of this application is achieved through the following technical solution:

[0008] Firstly, this application proposes an interference source direction finding method applied to a ground station, the ground station including an antenna, comprising:

[0009] The first scan path is planned based on the antenna's airspace range, and the path scan is performed.

[0010] Determine whether there are multiple antennas pointing in the first scan path that satisfy the symmetry condition;

[0011] If so, the path scan is performed to plan the next scan path based on the directions of the multiple antennas;

[0012] If not, find the antenna pointing to the maximum signal strength in the first scan path and plan the next scan path for path scanning;

[0013] Determine if the next scan path has multiple antennas pointing in a direction that satisfies the symmetry condition;

[0014] If the antenna pointing meets the convergence condition of the scan search, the antenna pointing that meets the convergence condition will be taken as the direction of the interference source.

[0015] Optionally, the step of planning the first scan path based on the antenna's spatial range and performing path scanning includes:

[0016] Determine whether the angle from the current pointing and pitch angle of the antenna to the minimum pitch angle of the airspace is greater than the angle from the current pointing and pitch angle of the antenna to the maximum pitch angle of the airspace.

[0017] If it is greater than the minimum pitch angle, then the antenna will perform a path scan from the current pointing pitch angle to the minimum pitch angle;

[0018] If it is not greater than the maximum pitch angle, then the antenna will perform a path scan from the current pointing pitch angle to the maximum pitch angle.

[0019] Optionally, the step of determining whether there are multiple antenna pointing in the first scan path that satisfy the symmetry condition includes:

[0020] Find the signal strength maxima points along the first scan path;

[0021] Determine whether there are fewer than four maximum signal strength points;

[0022] If there are fewer than four, calculate the first difference between the first maximum and the second maximum;

[0023] If the first difference is less than the first threshold, then the antenna pointing corresponding to the first maximum and the second maximum is determined to satisfy the symmetry condition.

[0024] If there are at least four, then simultaneously calculate the second difference between the third and fourth maxima, the third difference between the fifth and sixth maxima, the first pitch-azimuth difference between the third and fifth maxima, and the second pitch-azimuth difference between the fourth and sixth maxima.

[0025] If the second difference and the third difference are less than the second threshold, and the difference between the first elevation azimuth difference and the second elevation azimuth difference is less than the third threshold, then the antenna pointing corresponding to the third maximum, the fourth maximum, the fifth maximum and the sixth maximum are determined to satisfy the symmetry condition.

[0026] Optionally, the step of planning the next scanning path based on the directions of the plurality of antennas and performing path scanning includes:

[0027] Calculate the center direction of multiple antennas;

[0028] The next scan path is planned based on the fact that the middle direction is perpendicular to the previous scan path, and the path scan is performed.

[0029] Optionally, the step of planning the next scanning path based on the antenna pointing according to the maximum signal strength value includes:

[0030] The next scanning path is planned based on the antenna pointing perpendicular to the previous scanning path, according to the maximum signal strength value, and a path scan is performed.

[0031] Optionally, the step of using the antenna direction that satisfies the scan search convergence condition as the direction of the interference source when the antenna direction satisfies the scan search convergence condition includes:

[0032] If the antenna pointing to the maximum signal strength appears twice consecutively in the scanning path, and the difference between the two antenna pointing to the maximum signal strength is less than the fourth threshold, then the antenna pointing to the maximum signal strength is taken as the direction of the interference source.

[0033] Secondly, this application also proposes an interference source directional device for use in a ground station, the ground station including an antenna, the device comprising:

[0034] The path planning module is used to plan the first scan path based on the airspace range of the antenna and perform path scanning.

[0035] The pointing filtering module is used to determine whether there are multiple antenna pointing that satisfy the symmetry condition in the first scanning path;

[0036] The path planning module is also used to plan the next scanning path based on the multiple antenna directions, perform path scanning, and continue to determine whether there are multiple antenna directions that satisfy the symmetry condition.

[0037] The path planning module is also used to find the antenna pointing with the maximum signal strength in the first scanning path, plan the next scanning path based on the antenna pointing with the maximum signal strength, and continue to determine whether there are multiple antenna pointing that satisfy the symmetry condition.

[0038] The convergence decision module is used to identify the direction of the antenna that meets the convergence condition of the scan search as the direction of the interference source.

[0039] The main solution and its various further alternatives described above can be freely combined to form multiple solutions, all of which are solutions that can be adopted and are claimed in this application; furthermore, the (non-conflicting alternatives) can also be freely combined with each other and with other alternatives. Those skilled in the art, after understanding the solution of this application, will realize from the prior art and common general knowledge that there are many combinations, all of which are technical solutions to be protected by this application, and will not be exhaustively listed here.

[0040] This application discloses an interference source localization method and apparatus. First, a first scanning path is planned based on the spatial range of the antenna. Then, it is determined whether there are multiple antenna directions satisfying symmetry conditions within this scanning path. If so, a next scanning path is planned based on these multiple antenna directions. If not, a next scanning path is planned based on the antenna direction with the highest signal strength in the first scanning path. After the path scan, it is further determined whether there are multiple antenna directions satisfying symmetry conditions. If an antenna direction meets the scan search convergence condition, that antenna direction is taken as the direction of the interference source. By utilizing the centrally symmetric feature of the parabolic antenna pattern's projection, sparse scanning within a specified spatial range is achieved, quickly converging to the direction with the strongest interference signal amplitude, thus completing interference source localization in a short time. Attached Figure Description

[0041] Figure 1 A flowchart illustrating an interference source orientation method provided in an embodiment of this application is shown.

[0042] Figure 2 A schematic diagram of the pitch angle direction provided in an embodiment of this application is shown.

[0043] Figure 3 A schematic diagram of the vertical path in the scanning path provided in the embodiments of this application is shown.

[0044] Figure 4 A schematic diagram of the gain peak-valley characteristics provided in an embodiment of this application is shown.

[0045] Figure 5 A schematic diagram of the interference source directional scanning search path provided in an embodiment of this application is shown. Detailed Implementation

[0046] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0047] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] In existing technologies, using large-aperture parabolic antennas for interference source localization presents the following problems: First, the antenna beam is highly directional, making the maximum signal direction finding method suitable only for single antennas; amplitude comparison, synthesis, and phase comparison methods are not applicable. Second, the antenna beam is extremely narrow, requiring manual adjustment of the direction for spatial scanning to locate the interference source. Third, large-area spatial scanning is time-consuming, necessitating optimization of the scanning path. Mechanical scanning methods for interference source localization mainly include linear scanning, spiral rectangular scanning, spiral scanning, grating rectangular scanning, circular scanning, and Lissajous scanning. However, all of these methods require full spatial coverage scanning when the probability of the interference source's spatial distribution is unknown. Under the constraint of localization accuracy, completing full spatial coverage scanning requires a significant amount of time, which impacts the execution of normal telemetry and communication tasks.

[0049] To address the aforementioned issues, this application proposes an interference source orientation method. This method utilizes the central symmetry of the spherical projection of a parabolic antenna pattern to plan the antenna's mechanical scanning path, enabling sparse scanning within a specified spatial range and rapid convergence to the direction of the strongest interference signal amplitude. This allows for interference source orientation in a short time. The interference source orientation method will now be described in detail.

[0050] Please refer to Figure 1 , Figure 1 This illustration shows a flowchart of an interference source direction finding method provided in an embodiment of this application. The interference source direction finding method is applied to a ground station, which can be a large-aperture parabolic antenna ground station or other types of ground station. The ground station includes a large-aperture parabolic antenna. The implementation steps of the interference source direction finding method include:

[0051] Step S110: Plan the first scan path based on the airspace range of the antenna and perform path scanning.

[0052] Before proceeding to step S110, the ground station also needs to determine the frequency range and amplitude reporting period parameters of the interference signal from the directional interference source, and periodically estimate and report the amplitude of the interference signal from the interference source in real time.

[0053] In one possible implementation, the frequency range of the interference signal can be set to [f0 - 0.5 × B, f0 + 0.5 × B], where f0 is the center frequency of the interference signal and B is the 3dB bandwidth of the interference signal. The amplitude values ​​at each frequency point within this range are summed, with the amplitude values ​​uniformly in dB. The amplitude reporting period parameter is the time required to complete one estimation of the interference signal amplitude value. Each report needs to be time-stamped to ensure a one-to-one correspondence between the interference signal amplitude and the antenna direction.

[0054] The search path is planned and the starting direction is determined by sparse scanning. To ensure efficient scanning search within the spatial domain, the first scan path is planned. This process is as follows:

[0055] Determine whether the angle from the current pointing elevation angle of the antenna to the minimum elevation angle in the airspace is greater than the angle from the current pointing elevation angle of the antenna to the maximum elevation angle in the airspace. If it is greater, then perform a path scan of the antenna from the current pointing elevation angle to the minimum elevation angle. If it is not greater, then perform a path scan of the antenna from the current pointing elevation angle to the maximum elevation angle.

[0056] The airspace range can be a specified airspace range or a default airspace range. Within the specified airspace range, it is an external input that limits the possible airspace range of the interference source. If no explicit input is given, the default is an elevation angle of 0° to 90° and an azimuth angle of 0° to 360°.

[0057] In one possible real-time mode, if the pitch angle is between 0° and 90°, and the current pointing pitch angle is between 0° and 45°, it will scan along the direction of the 0° pitch angle. If the current pointing pitch angle is between 45° and 90°, it will scan along the direction of the 90° pitch angle. If it is at 45°, it can scan towards 0° or 90°.

[0058] For a better explanation, please refer to [link / reference]. Figure 2 , Figure 2 A schematic diagram of the pitch angle direction provided in an embodiment of this application is shown. Figure 2 Point O in the diagram represents the current direction the antenna is pointing. <E O A O Point B is the minimum pointing direction of the antenna. <E B A B Point C is the maximum pointing direction of the antenna. <E C A C First, the azimuth angle A of point O must be guaranteed. O Azimuth angles A and B respectively with point B B And the azimuth angle A of point C C Consistency (A) O =A B =A C Then, determine the pitch angles of points O, B, and C. If the pitch angle E of point O... O ≥0.5×(E B +E C If the current pointing elevation angle is closer to the maximum elevation angle within the specified airspace, a path scan is performed from the current pointing elevation angle to the minimum elevation angle. The antenna points from point O along the schematic path OB to point B, where OB is the shortest path from point O to point B on the celestial sphere. If the elevation angle E of point O is... O <0.5×(E) B +E C If the current pointing elevation angle is closer to the minimum elevation angle of the specified airspace range, a path scan is performed from the current pointing elevation angle to the maximum elevation angle. The antenna points from point O along the schematic path OC to point C, where OC is the shortest path from point O to point C on the celestial sphere.

[0059] Step S120: Determine whether there are multiple antennas pointing in the first scan path that satisfy the symmetry condition.

[0060] After performing a path scan according to the first scan path, the ground station will filter each antenna pointing in the first scan path according to the symmetry condition until multiple (at least two) antenna pointings that meet the symmetry condition are selected. If multiple antenna pointings that meet the symmetry condition are not selected in the first scan path, the current pointing elevation angle of the antenna returns to the initial position, and the airspace is scanned from another direction. If multiple antenna pointings that meet the symmetry condition are still not selected, then step S140 will be entered.

[0061] In step S120, to ensure full utilization of the symmetry characteristics of the parabolic antenna pattern, the step of filtering multiple antenna pointing points that satisfy the symmetry condition in the first scanning path is as follows: find all signal strength maxima points in the first scanning path, sort them in descending order of strength, and determine whether the number of signal strength maxima points is less than four. If it is less than four (two or three), calculate the first difference between the first maximum and the second maximum. The first maximum is the point with the largest signal strength, and the second maximum is the point with the second largest signal strength. Subtract the two to obtain the first difference. If the first difference is less than the first threshold, then it is determined that the antenna pointing points corresponding to the first maximum and the second maximum satisfy the symmetry condition.

[0062] If the number of signal strength maxima is not less than four, then the second difference between the third and fourth maxima, the third difference between the fifth and sixth maxima, the first elevation-azimuth difference between the third and fifth maxima, and the second elevation-azimuth difference between the fourth and sixth maxima are calculated simultaneously. If the second and third differences are less than the second threshold, and the difference between the first and second elevation-azimuth differences is less than the third threshold, then the antenna pointing corresponding to the third, fourth, fifth, and sixth maxima is determined to satisfy the symmetry condition.

[0063] It is worth noting that the first threshold, the second threshold, and the third threshold can all be set according to the actual situation. Each threshold may be the same or different.

[0064] In one possible embodiment, if the antenna pointing to a maximum point is...<E1,A1> The antenna pointing at the other maximum point is<E2,A2> Then the elevation azimuth difference between these two maximum points is:

[0065] cos -1 [0.5×(cos(E1-E2)×(cos(A1-A2)+1)+cos(E1+E2)×(cos(A1-A2)-1))].

[0066] Step S130: Plan the next scanning path based on the directions of multiple antennas and perform path scanning.

[0067] First, calculate the center direction of multiple antennas, and then plan the next scanning path based on the fact that the center direction is perpendicular to the previous scanning path, and perform path scanning.

[0068] Step S140: Find the antenna pointing to the maximum signal strength in the first scan path, and plan the next scan path based on the antenna pointing to the maximum signal strength.

[0069] If there are not multiple antennas pointing in the first scan path that meet the symmetry condition, then the next scan path will be planned according to the antenna pointing with the maximum signal strength being perpendicular to the previous scan path, and the path will be scanned.

[0070] The starting point of the scan path is the intersection of the current path with the boundary of the specified airspace, and the direction of the nearest intersection with the end point of the previous scan.

[0071] In one possible embodiment, if there are two antennas that satisfy the symmetry condition, namely...<E1,A1> and<E2,A2> Then the middle direction of these two antennas that satisfy the symmetry condition is <0.5(E1+E2),0.5(A1+A2)>. If there are four antennas that satisfy the symmetry condition, they are respectively...<E1,A1> ,<E2,A2> ,<E3,A3> as well as<E4,A4> Then the center direction of the four antennas that satisfy the symmetry condition is <0.25(E1+E2+E3+E4),0.25(A1+A2+A3+A4)>, and so on. This application embodiment will not elaborate further.

[0072] Please refer to Figure 3 , Figure 3 The diagram illustrates the vertical path in the scanning path provided in this embodiment. If the first or previous scanning path is MN, the direction corresponding to point Q is the center direction. The next scanning path SP is drawn through point Q, perpendicular to the previous scanning path MN. At this time, plane OSQP is perpendicular to plane OMQN. It is worth noting that the planned path is always in the pitch or azimuth direction. Therefore, if the previously planned path is in the pitch direction, the next planned path will be in the azimuth direction, and vice versa.

[0073] Please refer to this again. Figure 3 If the previous scan path was MN and the scan ended at point N, and the next planned path is SP, with intersections with the airspace at points S and P, calculate the elevation azimuth difference β between points N and S. NS The elevation azimuth difference β between points N and P. NP Compare β NS With β NP The size of β NS Greater than β NP If N is closer to P, then P is selected as the nearest intersection point. In the next path planning, SP switches from N to P for path scanning. This method allows the parabolic antenna to turn smoothly and maintain a relatively fast adjustment. In addition, using a spiral motion makes the adjustment path smoother.

[0074] Step S150: Determine whether there are multiple antennas pointing in the scanning path that satisfy the symmetry condition.

[0075] Regardless of whether the scanning path is planned based on multiple antenna directions or the antenna direction with the maximum signal strength, after the path scan is completed, it is determined whether there are multiple antenna directions that satisfy the symmetry condition in this scanning path. If there are, the next scanning path is planned based on the multiple antenna directions. If not, the antenna direction with the maximum signal strength in the first scanning path is found, and the next scanning path is planned based on the antenna direction with the maximum signal strength. This process of planning and searching multiple times continues until the scanning search convergence condition is met.

[0076] Step S160: If the antenna pointing meets the scan search convergence condition, the antenna pointing that meets the scan search convergence condition is taken as the direction of the interference source.

[0077] The convergence condition for the scan search is: the antenna pointing where the maximum signal strength occurs twice consecutively along the scan path, and the difference between the two antenna pointing directions where the maximum signal strength occurs is less than a fourth threshold. If the antenna pointing satisfies this convergence condition, the antenna pointing where the second maximum signal strength occurs is taken as the direction of the interference source.

[0078] The antenna pointing to the location where the signal strength was at its maximum during the previous path scan is denoted as POWER. MAX The next scan path is planned and a path scan is performed. If the antenna with the maximum signal strength is found again in the next path scan, it is denoted as POWER'. MAX , judge|POWER MAX -POWER' MAX Is it less than the fourth threshold POWER? th If it is less than, then convergence is achieved; if it is not less than, then divergence is achieved. MAX The corresponding antenna is pointed in the direction of the interference source.

[0079] To better illustrate the above steps, this application provides a possible implementation method, please refer to... Figure 4 , Figure 4A schematic diagram of the gain peak-valley characteristics provided in an embodiment of this application is shown. As shown, when the interference source is in the spatial domain of the parabolic antenna, due to the symmetry of the parabolic radiation pattern and the gain peak-valley characteristics in the elevation and azimuth directions, the intensity of the received interference signal will change when the parabolic antenna points to different positions on the spatial sphere. The change pattern is the same as that of the parabolic radiation pattern, i.e., the signal intensity ripple peaks in the figure. The first ring of signal intensity peaks is formed by the second sidelobe of the parabolic antenna, the second ring by the third sidelobe, the third ring by the fourth sidelobe, and so on. The interference signal intensity ripple peaks pointing to different positions of the parabolic antenna inherit the symmetry of the radiation pattern and the gain peak-valley characteristics in the elevation and azimuth directions of the parabolic antenna.

[0080] Furthermore, in order to better illustrate the embodiments of this application, the following is based on... Figure 4 Next, the interference source based on sparse scanning of the radiation pattern feature will be directed. Please refer to [the relevant documentation / reference]. Figure 5 , Figure 5 This diagram illustrates a directional scanning search path for interference sources provided in an embodiment of this application. The interference source directional method provided in this embodiment may include the following steps:

[0081] Step S1: Assume the possible spatial range of the external interference source is BCDF, and the initial position of the antenna is in the antenna pointing direction corresponding to point O. Based on the antenna pointing direction corresponding to point O... <E O A O > and the airspace range BCDF, determine the minimum pitch angle and maximum pitch angle as E respectively. G and E H ;

[0082] Step S2: Calculate 0.5 × (E) G +E H If E O ≤0.5×(E G +E H If the current pitch angle is closer to the minimum pitch angle within the specified airspace range, then the current pitch angle is closer to the minimum pitch angle within the specified airspace range.

[0083] Step S3: Scan the antenna pointing direction from the 90° elevation direction to the antenna pointing direction corresponding to point H;

[0084] Step S4: If, during the path scanning process, the maximum interference signal strength points are I, J, K, L, L1, and L2, then the interference strength corresponding to the maximum point is POWER. I POWER J POWER K POWER L POWER L1 POWER L2 ;

[0085] Step S5: Sort the maxima points in descending order of interference intensity as J, K, L, I, L1, L2. At this point, there are 6 maxima points (no less than 4). Take the first four maxima points J, K, L, I.

[0086] Step S6: Determine whether the difference between point J and point K, and the difference between point L and point I, are less than or equal to the threshold. |POWER J -POWER K |≤POWER TH1 With |POWER L -POWER I |≤POWER TH1 Simultaneously calculate the pitch azimuth difference between point J and L (corresponding directions) and the pitch azimuth difference between point K and I (corresponding directions), as follows:

[0087] cos -1 [0.5×(cos(E J -E L )×(cos(A J -A L )+1)+cos(E J +E L )×(cos(A J -A L )-1))] and

[0088] cos -1 [0.5×(cos(E K -E I )×(cos(A K -A I )+1)+cos(E K +E I )×(cos(A K -A I Subtract the two and take the absolute value. If this value is less than or equal to the threshold β, th1 Then, determine whether the four maximum points J, K, L, I satisfy the symmetry condition;

[0089] Step S7: Calculate the midpoint of the maximum points J, K, L, I. This midpoint corresponds to point M in the graph, and the midpoint is <0.25 (E). J +E K +E L +E I ),0.25(A J +A K +A L +A I )>;

[0090] Step S8: Plan the current scan path NP, and draw a path perpendicular to the previous scan path OH through point M;

[0091] Step S9: The end point of the previous scan is H. Calculate the elevation azimuth difference between point N and point H, and the elevation azimuth difference between point P and point H. If the elevation azimuth difference between point P and point H is greater than the elevation azimuth difference between point N and point H, then select point N as the starting position of the next path scan.

[0092] Step S10: Adjust the antenna pointing from point H to point N, and scan the antenna pointing corresponding to point P according to the NP path;

[0093] Step S11: Multiple antennas that satisfy the symmetry condition appear in the scanning path NP. During the scanning process of this path, the maximum value points of the interference signal intensity are Q3, Q2, Q1, Q, R, S, T, U, U1, U2, U3.

[0094] Step S12: Sort the maximum values ​​of the interference signal strength in descending order of interference signal strength as S, T, R, U, Q, Q1, U1, Q2, U2, U3, Q3. At this time, the number of maximum values ​​is no less than 4. Take the first four maximum values ​​as S, T, R, U.

[0095] Step S13: If the difference between point S and point T is greater than the threshold, |POWER S -POWER T |>POWER TH1 Then the pointers corresponding to the four maxima do not satisfy the symmetry condition;

[0096] Step S14: Find the antenna pointing at the POWER where the interference signal strength is the maximum. S Point the antenna corresponding to point S. <E S A S Set as the middle pointer;

[0097] Step S15: Plan the current scan path WV, and draw a line NP perpendicular to the previous scan path through point S;

[0098] Step S16: The end point of the previous scan is P. Calculate the elevation azimuth difference between point W and point P and the elevation azimuth difference between point V and point P. At this time, the elevation azimuth difference between point W and point P is greater than the elevation azimuth difference between point V and point P. Then select point V as the starting position of the next path scan.

[0099] Step S17: Adjust the antenna pointing from point P to point V, and scan the antenna pointing to point W according to the VW path;

[0100] Step S18: The maximum values ​​of the interference signal intensity appearing on the scanning path VW are X3, X2, X1, X, Y, S, Z, B1, B2, B3, B4;

[0101] Step S19: Sort all the maximum points in descending order of interference signal strength as follows: S, Y, Z, X, B1, B2, X1, X2, B3, X3, B4. At this time, the number of maximum points is no less than 4. Take the first four maximum points as S, T, R, U.

[0102] Step S20: If the difference between point S and point T is greater than the threshold, |POWER' S -POWER T |>POWER TH1 If the pointers corresponding to the four maxima do not satisfy the symmetry condition, then the pointers to these four maxima do not satisfy the symmetry condition.

[0103] Step S21: Find the antenna pointing to POWER' where the interference signal strength is the maximum. S ;

[0104] Step S22: The maximum value of the interference signal strength POWER was found in the previous scan search. S , judge|POWER' S -POWER S |<POWER TH2 At this point, the antenna pointing meets the convergence condition for the scan search, and the scan ends;

[0105] Step S23: The antenna pointing at point S that satisfies the convergence condition of the scan search is taken as the direction of the interference source <E>. S A S >.

[0106] Furthermore, in the interference source orientation method provided in this application embodiment, the cumulative angle swept by the path is:

[0107] (E D -E O )+(A B -A D )+(E D -E B )+(A O -A D )+2(E D -E N )+(A B -A V If a full-space coverage scanning method is used, the cumulative angle swept by the path is approximately (A). B -A D )×[(E D -E B ) / θ]+(E D-E B ), where θ is half the 3dB width of the parabolic main lobe. If the average velocity of the antenna scan is the same as the average velocity of the full-coverage scan across the entire airspace, then using the interference source orientation method can shorten the interference source orientation time:

[0108]

[0109] In one possible implementation, assuming the antenna directions corresponding to points B, D, O, N, and V are <0°, 90°>, <90°, 0°>, <20°, 30°>, <45°, 0°>, and <90°, 45°> respectively, if θ is taken as 0.1°, the orientation time of the interference source is shortened to:

[0110]

[0111] Compared with the prior art, the embodiments of this application have the following beneficial effects:

[0112] By utilizing the centrally symmetric feature of the parabolic antenna pattern, a mechanical scanning path is planned to achieve sparse scanning within a specified spatial range, quickly converge to the direction of the strongest interference signal amplitude, and complete the orientation of the interference source in a short time.

[0113] The above describes embodiments of the interference source orientation method of this application. The following embodiments of this application will further describe the interference source orientation device corresponding to the interference source orientation method.

[0114] This application provides an interference source orientation device for use at a ground station. The interference source orientation device includes a path planning module, a pointing filtering module, and a convergence decision module.

[0115] The path planning module is used to plan the first scan path based on the antenna's airspace range for path scanning.

[0116] The pointing filtering module is used to determine whether there are multiple antenna pointing in the first scan path that meet the symmetry condition.

[0117] The path planning module is also used to plan the next scanning path based on the pointing of multiple antennas, and to continue to determine whether there are multiple antenna pointing that meet the symmetry condition.

[0118] The path planning module is also used to find the antenna pointing with the maximum signal strength in the first scan path, and to plan the next scan path based on the antenna pointing with the maximum signal strength, and to continue to determine whether there are multiple antenna pointing that meet the symmetry condition.

[0119] The convergence decision module is used to identify the direction of the antenna that meets the convergence condition of the scan search as the direction of the interference source.

[0120] It is worth noting that this device embodiment corresponds to the method embodiment, and all implementations of the above method embodiment are applicable to this device embodiment, so they will not be repeated here.

[0121] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for locating an interference source, characterized in that, Applied to ground stations, including: The first scan path is planned based on the antenna's airspace range, and the path scan is performed. Determine whether there are multiple antennas pointing in the first scan path that satisfy the symmetry condition; The step of determining whether there are multiple antenna pointing in the first scan path that satisfy the symmetry condition includes: Find the signal strength maxima points along the first scan path; Determine whether there are fewer than four maximum signal strength points; If there are fewer than four, calculate the first difference between the first maximum and the second maximum; If the first difference is less than the first threshold, then the antenna pointing corresponding to the first maximum and the second maximum is determined to satisfy the symmetry condition. If there are at least four, then simultaneously calculate the second difference between the third and fourth maxima, the third difference between the fifth and sixth maxima, the first pitch-azimuth difference between the third and fifth maxima, and the second pitch-azimuth difference between the fourth and sixth maxima. If the second difference and the third difference are less than the second threshold, and the difference between the first elevation azimuth difference and the second elevation azimuth difference is less than the third threshold, then it is determined that the antenna pointing corresponding to the third maximum, the fourth maximum, the fifth maximum and the sixth maximum satisfy the symmetry condition. If so, the path scan is performed to plan the next scan path based on the directions of the multiple antennas; If not, find the antenna pointing to the maximum signal strength in the first scan path and plan the next scan path for path scanning; Determine if the next scan path has multiple antennas pointing in a direction that satisfies the symmetry condition; If the antenna pointing meets the convergence condition of the scan search, the antenna pointing that meets the convergence condition will be taken as the direction of the interference source.

2. The interference source localization method as described in claim 1, characterized in that, The step of planning the first scan path based on the antenna's spatial range and performing path scanning includes: Determine whether the angle from the current pointing and pitch angle of the antenna to the minimum pitch angle of the airspace is greater than the angle from the current pointing and pitch angle of the antenna to the maximum pitch angle of the airspace. If it is greater than the minimum pitch angle, then the antenna will perform a path scan from the current pointing pitch angle to the minimum pitch angle; If it is not greater than the maximum pitch angle, then the antenna will perform a path scan from the current pointing pitch angle to the maximum pitch angle.

3. The interference source localization method as described in claim 1, characterized in that, The step of planning the next scanning path based on the directions of the multiple antennas and performing path scanning includes: Calculate the center direction of multiple antennas; The next scan path is planned based on the fact that the middle direction is perpendicular to the previous scan path, and the path scan is performed.

4. The interference source localization method as described in claim 1, characterized in that, The steps of planning the next scanning path based on the antenna pointing according to the maximum signal strength include: The next scanning path is planned based on the antenna pointing perpendicular to the previous scanning path, according to the maximum signal strength value, and a path scan is performed.

5. The interference source localization method as described in claim 1, characterized in that, The step of using the antenna direction that satisfies the scan search convergence condition as the direction of the interference source when the antenna direction satisfies the scan search convergence condition includes: If the antenna pointing to the maximum signal strength appears twice consecutively in the scanning path, and the difference between the two antenna pointing to the maximum signal strength is less than the fourth threshold, then the antenna pointing to the second maximum signal strength will be taken as the direction of the interference source.

6. An interference source directional device, characterized in that, Applied to ground stations, the device includes: The path planning module is used to plan the first scan path based on the antenna's airspace range and perform path scanning. The pointing filtering module is used to determine whether there are multiple antenna pointing that satisfy the symmetry condition in the first scanning path: to find the signal strength maximum point of the first scanning path; Determine whether there are fewer than four maximum signal strength points; If there are fewer than four, calculate the first difference between the first maximum and the second maximum; If the first difference is less than the first threshold, then the antenna pointing corresponding to the first maximum and the second maximum is determined to satisfy the symmetry condition. If there are at least four, then simultaneously calculate the second difference between the third and fourth maxima, the third difference between the fifth and sixth maxima, the first pitch-azimuth difference between the third and fifth maxima, and the second pitch-azimuth difference between the fourth and sixth maxima. If the second difference and the third difference are less than the second threshold, and the difference between the first elevation azimuth difference and the second elevation azimuth difference is less than the third threshold, then it is determined that the antenna pointing corresponding to the third maximum, the fourth maximum, the fifth maximum and the sixth maximum satisfy the symmetry condition. The path planning module is also used to plan the next scanning path based on the multiple antenna directions, perform path scanning, and continue to determine whether there are multiple antenna directions that satisfy the symmetry condition. The path planning module is also used to find the antenna pointing with the maximum signal strength in the first scan path when there are no multiple antenna pointings that meet the symmetry condition in the first scan path, and to plan the next scan path based on the antenna pointing with the maximum signal strength, and continue to determine whether there are multiple antenna pointings that meet the symmetry condition. The convergence decision module is used to identify the direction of the antenna that meets the convergence condition of the scan search as the direction of the interference source.

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