Primary and secondary channel collaborative direction finding method based on reflector antenna

Abstract

The embodiment of the invention provides a main and auxiliary channel cooperative direction finding method based on a reflector antenna, and relates to the technical field of direction finding, and the method comprises the steps: determining the aperture of a main reflector antenna according to a detection target, a coverage area requirement and a detection gain requirement; according to the aperture of the main reflector antenna, performing interception processing on a radar signal and a communication signal of a target in a main channel corresponding to the main reflector antenna, and measuring parameters of the radar signal and the communication signal; and an auxiliary channel corresponding to the auxiliary reflector antenna performs phase frequency point detection based on the parameters based on the radar signal and the communication signal, and performs phase difference measurement, direction finding and defuzzification processing based on a detection result. According to the technical scheme of the invention, cooperative work between the large aperture antenna and the small aperture antenna can be realized, and effective target detection and receiving and high-precision target direction finding are satisfied.

Description

Technical Field

[0001] The present application relates to the technical field of direction finding, and in particular to a primary and secondary channel collaborative direction finding method based on a reflector antenna. Background Art

[0002] When the space platform discovers and perceives these targets, when the target has the characteristics of wide bandwidth, ultra-low sidelobe, and low interception, the traditional interferometer direction finding requires a larger caliber antenna to form the interferometer baseline. Since the interferometer antenna is installed on the space platform, it is limited by the layout space, and a more practical asymmetric interferometer system is often used, such as "Asymmetric Interferometer Technology and Engineering Implementation" [J] Aerospace Electronic Countermeasures, 2019, 35(4): 16-19. After receiving the target through antennas with different antenna unit calibers, the phase measurement is achieved by accumulation.

[0003] In the asymmetric interferometer system, the large-aperture antenna and the small-aperture antenna have different coverage areas, different detected signal powers, and different signal-to-noise ratios. How to design large and small aperture antennas to work together, coverage area design, and large and small aperture antenna detection strategies are key considerations in the design. Summary of the invention

[0004] The embodiments of the present application provide a primary and secondary channel collaborative direction finding method based on a reflector antenna to solve the problems existing in the prior art.

[0005] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0006] According to a first aspect of an embodiment of the present application, a primary-secondary channel collaborative direction finding method based on a reflector antenna is provided, wherein the reflector antenna comprises a primary reflector antenna and a secondary reflector antenna, and is characterized in that it comprises:

[0007] Determine the aperture of the main reflector antenna based on the detection target, coverage area requirements and detection gain requirements;

[0008] According to the aperture of the main reflector antenna, the target's radar signal and communication signal are intercepted and processed in the main channel corresponding to the main reflector antenna, and the parameters of the radar signal and communication signal are measured;

[0009] The sub-channel corresponding to the sub-reflector antenna performs phase frequency point detection based on the parameters based on the radar signal and the communication signal, and performs phase difference measurement, direction finding and deambiguation processing based on the detection result.

[0010] In some embodiments of the present application, based on the above-mentioned solution, determining a suitable main reflector antenna aperture according to the detection target, coverage area requirement and detection gain requirement includes:

[0011] Determine the reasonable main reflector antenna based on the transmitting antenna radiation pattern, EIRP and detection distance of the detected target, and then design the aperture of the main reflector antenna based on the coverage area requirements and detection gain requirements.

[0012] In some embodiments of the present application, based on the above scheme, the radar signal of the target is intercepted and processed, including:

[0013] The radar signal is processed by channelization, discrete Fourier transform, signal detection, intra-pulse identification and coarse lateral processing.

[0014] In some embodiments of the present application, based on the above solution, measuring the parameters of the radar signal includes:

[0015] Measures the signal frequency, pulse width and arrival time of radar signals.

[0016] In some embodiments of the present application, based on the aforementioned solution, phase frequency point detection is performed based on the parameters of the radar signal, and phase difference measurement, direction finding and ambiguity resolution are performed based on the detection results, including:

[0017] According to the signal frequency and pulse width of a radar signal detected by the main channel, at the frequency point position of the signal frequency, the main-sub-channel phase difference and the sub-sub-channel phase difference of the frequency points corresponding to the main-sub-channel are detected;

[0018] Classifying pulse trains according to the phase difference between the main and sub-channels and the phase difference between the sub-sub-channels, and accumulating pulses according to the classified pulse groups;

[0019] The amplitude ratio coarse direction finding result of the main channel is used to calculate and deambiguate the direction finding result of the secondary channel.

[0020] In some embodiments of the present application, based on the above scheme, the communication signal of the target is intercepted and processed, including:

[0021] The communication signal is subjected to channelization processing, discrete Fourier transform processing, signal detection processing, modulation recognition processing and coarse lateral processing.

[0022] In some embodiments of the present application, based on the above solution, measuring the parameters of the communication signal includes:

[0023] Measures signal frequency, bandwidth, and bit rate of communication signals.

[0024] In some embodiments of the present application, based on the above scheme, phase frequency point detection is performed based on the parameters of the communication signal, and phase difference measurement, direction finding and ambiguity resolution are performed based on the detection results, including:

[0025] According to the signal frequency and bandwidth of a communication signal detected by the main channel, at the frequency point position of the communication signal, the main-sub-channel phase difference and the sub-sub-channel phase difference of the frequency points corresponding to the main-sub-channel are detected;

[0026] Direction finding processing is performed based on the phase difference of the secondary and secondary channels;

[0027] The amplitude ratio coarse direction finding result of the main channel is used to calculate and deambiguate the direction finding result of the secondary channel.

[0028] In some embodiments of the present application, based on the above solution, it also includes:

[0029] Design the coverage area position of the main reflector antenna.

[0030] In some embodiments of the present application, based on the above solution, it also includes:

[0031] The coverage area wave position of the sub-reflector antenna is designed, and the multi-beam coverage area formed by the sub-reflector antenna is greater than or equal to the multi-beam coverage area formed by the main reflector antenna.

[0032] The technical solution of the present application, under the strong constraints of volume, weight and power consumption, utilizes the main reflector antenna for intercepting signals to meet the effective detection of low interception or weak targets, designs reasonable main reflector antenna and sub-reflector antenna collaborative processing, beam coverage, and beam switching strategies, utilizes the coarse direction finding results of the main reflector antenna for signal interception, and guides the asymmetric interferometer sub-reflector antenna to achieve high-precision direction finding of low interception or weak targets.

[0033] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0035] Figure 1 A schematic flow chart of a method for collaborative direction finding of a primary and secondary channel based on a reflector antenna according to an embodiment of the present application is shown;

[0036] Figure 2 A schematic diagram of a typical main antenna multi-beam coverage method according to an embodiment of the present application is shown;

[0037] Figure 3A schematic diagram of primary and secondary reflector antenna coverage according to an embodiment of the present application is shown;

[0038] Figure 4 A schematic diagram of the beam coverage of the main reflector antenna 31 in a coverage area according to an embodiment of the present application is shown;

[0039] Figure 5 A schematic diagram of beam coverage of a sub-reflector antenna 4 in a coverage area according to an embodiment of the present application is shown;

[0040] Figure 6 A schematic diagram of cooperative reconnaissance coverage of primary and secondary reflector antennas within a coverage area according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0041] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0042] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0043] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0044] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0045] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Some embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0047] In order to meet the requirements of effective target detection and high-precision direction finding of the target, under the strong constraints of platform installation, an embodiment of the present application provides a main-sub-channel collaborative direction finding method based on reflector antennas. The method uses a main reflector antenna to detect the target, measure parameters and perform coarse direction finding on the target, and then guides the sub-reflector antenna of the two-dimensional / multi-dimensional interferometer baseline to perform precise direction finding on the target.

[0048] See also Figure 1 , shows a flow chart of a method for collaborative direction finding of primary and secondary channels based on a reflector antenna according to an embodiment of the present application.

[0049] like Figure 1 As shown, a method for collaborative direction finding of primary and secondary channels based on a reflector antenna is presented, which specifically includes steps S100 to S300.

[0050] It should be noted that the reflector antenna includes a main reflector antenna and a sub-reflector antenna.

[0051] Step S100, determining the aperture of the main reflector antenna according to the detection target, coverage area requirement and detection gain requirement.

[0052] In some feasible embodiments, based on the above solution, step S100 specifically includes:

[0053] Based on the actual application, according to the transmitting antenna radiation pattern, EIRP and detection distance of the detection target, first select a reasonable main reflector antenna, then consider the coverage area and detection gain requirements, and design a reasonable main reflector antenna aperture.

[0054] Continue to refer Figure 1 , step S200, according to the aperture of the main reflector antenna, the radar signal and the communication signal of the target are intercepted and processed in the main channel corresponding to the main reflector antenna, and the parameters of the radar signal and the communication signal are measured.

[0055] In some feasible embodiments, based on the above scheme, in order to realize instantaneous narrowband signal processing, real-time signal interception and high-precision parameter measurement, the radar signal of the target is intercepted and processed, including:

[0056] The radar signal is processed by channelization, discrete Fourier transform, signal detection, intra-pulse identification and coarse lateral processing.

[0057] In some feasible embodiments, based on the above solution, measuring the parameters of the radar signal includes:

[0058] Measures the signal frequency, pulse width and arrival time of radar signals.

[0059] In some feasible embodiments, based on the above scheme, in order to realize instantaneous narrowband signal processing, real-time signal interception and high-precision parameter measurement, the communication signal of the target is intercepted and processed, including:

[0060] The communication signal is subjected to channelization processing, discrete Fourier transform processing, signal detection, modulation recognition processing and coarse lateral processing.

[0061] In some feasible embodiments, based on the above solution, measuring the parameters of the communication signal includes:

[0062] Measures signal frequency, bandwidth, and bit rate of communication signals.

[0063] Continue to refer Figure 1 , step S300, the sub-channel corresponding to the sub-reflector antenna performs phase frequency point detection based on the parameters based on the radar signal and the communication signal, and performs phase difference measurement, direction finding and deambiguation processing based on the detection result.

[0064] In some feasible embodiments, based on the above scheme, for radar signals, phase frequency point detection is performed based on the parameters of the radar signals, and phase difference measurement, direction finding and deambiguation processing are performed based on the detection results, including:

[0065] According to the signal frequency and pulse width of a radar signal detected by the main channel, at the frequency point position of the signal frequency, the main-sub-channel phase difference and the sub-sub-channel phase difference of the frequency points corresponding to the main-sub-channel are detected;

[0066] Classifying pulse trains according to the phase difference between the main and sub-channels and the phase difference between the sub-sub-channels, and accumulating pulses according to the classified pulse groups;

[0067] The amplitude ratio coarse direction finding result of the main channel is used to calculate and deambiguate the direction finding result of the secondary channel.

[0068] It can be understood that pulse accumulation according to the classified pulse groups can improve the phase measurement accuracy.

[0069] In some feasible embodiments, based on the above scheme, for a communication signal, phase frequency point detection is performed based on the parameters of the communication signal, and phase difference measurement, direction finding and deambiguation processing are performed based on the detection results, including:

[0070] According to the signal frequency and bandwidth of a communication signal detected by the main channel, at the frequency point position of the communication signal, the main-sub-channel phase difference and the sub-sub-channel phase difference of the frequency points corresponding to the main-sub-channel are detected;

[0071] Direction finding processing is performed based on the phase difference of the secondary and secondary channels;

[0072] The amplitude ratio coarse direction finding result of the main channel is used to calculate and deambiguate the direction finding result of the secondary channel.

[0073] In some feasible embodiments, based on the above solution, the method further includes:

[0074] Design the coverage area position of the main reflector antenna.

[0075] It is understandable that within the required coverage area, if a beam is to be formed to cover the entire coverage area, there will be a large number of beams, which will require a large amount of volume, weight and power consumption resources in specific engineering implementation. According to actual needs, the main reflector antenna forms N coverage beams within the coverage area, where N is a positive integer greater than or equal to 1.

[0076] For example, according to the traditional reflector antenna feed element layout method, assuming that the beam arrangement method is as follows Figure 2 In the entire coverage area, a total of 19 beams are formed to cover the required coverage area at the same time, and the beams are compared with each other to achieve rough direction finding of the target.

[0077] In some feasible embodiments, based on the above solution, the method further includes:

[0078] The coverage area wave position of the sub-reflector antenna is designed, and the multi-beam coverage area formed by the sub-reflector antenna is greater than or equal to the multi-beam coverage area formed by the main reflector antenna.

[0079] It is understandable that the secondary reflector antenna has a smaller aperture than the primary reflector antenna and a larger coverage area. Therefore, in order to achieve coordinated processing of primary and secondary channel guidance, the beam coverage area formed by the secondary reflector antenna needs to be larger than the multi-beam coverage area formed by the primary reflector or the beam coverage areas of the two are equivalent.

[0080] Exemplarily, the corresponding relationship between the coverage area of ​​the secondary reflector antenna and the coverage area of ​​the primary reflector antenna is as follows: Figure 3 In the sub-channel corresponding to the sub-reflector antenna, the coarse direction finding result of the target is used to guide the interferometer sub-channel to achieve the target precise direction finding.

[0081] Below, an example is provided.

[0082] In a certain project, the above design is used to meet the installation requirements of the space platform, and the interferometer direction finding and direction finding amplitude resolution meet the requirements. For the frequency of 2000MHz, the coverage area is required to be ±30° in azimuth and elevation. The designed main reflector antenna consists of 31 feed elements, forming 31 beams that instantly cover azimuth and elevation ±30°, such as Figure 4 The sub-reflector antenna consists of 4 feed elements, covering the azimuth and elevation of ±30° instantaneously, as shown in Figure 5 The main reflector antenna cooperative reconnaissance coverage diagram is shown in Figure 6 shown.

[0083] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. It should be understood that the present application is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A method for coordinated direction finding of main and sub-channels based on a reflector antenna, wherein the reflector antenna comprises a main reflector antenna and a sub-reflector antenna, characterized in that: include: Determine the aperture of the main reflector antenna based on the detection target, coverage area requirements and detection gain requirements; According to the aperture of the main reflector antenna, the target's radar signal and communication signal are intercepted and processed in the main channel corresponding to the main reflector antenna, and the parameters of the radar signal and communication signal are measured; The sub-channel corresponding to the sub-reflector antenna performs phase frequency point detection based on the parameters based on the radar signal and the communication signal, and performs phase difference measurement, direction finding and deambiguation processing based on the detection result.

2. The method according to claim 1, characterized in that Determining the appropriate main reflector antenna aperture according to the detection target, coverage area requirements and detection gain requirements includes: Determine the reasonable main reflector antenna based on the transmitting antenna radiation pattern, EIRP and detection distance of the detected target, and then design the aperture of the main reflector antenna based on the coverage area requirements and detection gain requirements.

3. The method according to claim 1, characterized in that Intercept and process the target's radar signal, including: The radar signal is processed by channelization, discrete Fourier transform, signal detection, intra-pulse recognition and coarse lateral processing.

4. The method according to claim 3, characterized in that Measures parameters of radar signals, including: Measures the signal frequency, pulse width and arrival time of radar signals.

5. The method according to claim 4, characterized in that Phase frequency point detection is performed based on the parameters of the radar signal, and phase difference measurement, direction finding and ambiguity resolution are performed based on the detection results, including: According to the signal frequency and pulse width of a radar signal detected by the main channel, at the frequency point position of the signal frequency, the main-sub-channel phase difference and the sub-sub-channel phase difference of the frequency points corresponding to the main-sub-channel are detected; Classifying pulse trains according to the phase difference between the main and sub-channels and the phase difference between the sub-sub-channels, and accumulating pulses according to the classified pulse groups; The amplitude ratio coarse direction finding result of the main channel is used to calculate and deambiguate the direction finding result of the secondary channel.

6. The method according to claim 1, characterized in that Intercept and process the target's communication signals, including: The communication signal is subjected to channelization processing, discrete Fourier transform processing, signal detection processing, modulation recognition processing and coarse lateral processing.

7. The method according to claim 6, characterized in that Measures parameters of communication signals, including: Measures signal frequency, bandwidth, and bit rate of communication signals.

8. The method according to claim 7, characterized in that Phase frequency point detection is performed based on the parameters of the communication signal, and phase difference measurement, direction finding and ambiguity resolution are performed based on the detection results, including: According to the signal frequency and bandwidth of a communication signal detected by the main channel, at the frequency point position of the communication signal, the main-sub-channel phase difference and the sub-sub-channel phase difference of the frequency points corresponding to the main-sub-channel are detected; Direction finding processing is performed based on the phase difference of the secondary and secondary channels; The amplitude ratio coarse direction finding result of the main channel is used to calculate and deambiguate the direction finding result of the secondary channel.

9. The method according to any one of claims 1 to 8, characterized in that: Also includes: Design the coverage area position of the main reflector antenna.

10. The method according to claim 9, characterized in that Also includes: The coverage area wave position of the sub-reflector antenna is designed, and the multi-beam coverage area formed by the sub-reflector antenna is greater than or equal to the multi-beam coverage area formed by the main reflector antenna.

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