Angular flicker radio frequency semi-physical simulation system based on multi-scattering-point signal amplitude and phase control

Abstract

An angular flicker radio frequency semi-physical simulation system based on multi-scattering-point signal amplitude-phase control relates to an angular flicker radio frequency semi-physical simulation technology, and comprises a conversion control board, a scattering point amplitude-phase control module, a precise control module group and a plurality of combiners, the conversion control board converts received information into signals which can be received by an FPGA (Field Programmable Gate Array) through an interface module; the FPGA converts the received signal into TTL interface voltage through the code word conversion board, and controls the amplitude and phase of the scattering point amplitude and phase control module and the precise control module group; the scattering point amplitude and phase control module is composed of a plurality of branches, each branch comprises a programmable phase shifter A and a programmable attenuator A which are connected in sequence, and the branches are used for completing control over the amplitudes and phases of different scattering points; the method is reasonable in design, effectively reduces the construction cost and the system hardware scale when simulating a plurality of scattering points, and improves the stability and reliability of the system.

Description

Technical Field

[0001] The invention relates to an angular scintillation radio frequency semi-physical simulation technology, in particular to an angular scintillation radio frequency semi-physical simulation system based on multi-scattering point signal amplitude and phase control. Background Art

[0002] It is well known that angular glint is the main error source of the active radar seeker in the terminal guidance stage and is one of the important factors affecting the attack accuracy of the active radar seeker. Any extended target whose target size is comparable to the wavelength and has two or more equivalent scattering centers will produce angular glint effect. In order to reduce the influence of angular glint, the active radar seeker can effectively suppress the influence of angular glint by emitting broadband signals and performing corresponding processing, so as to improve the attack hit rate.

[0003] The RF semi-physical simulation system is a type of semi-physical simulation system. The corresponding physical objects are included in its simulation loop. By connecting some mathematical models, some physical models and actual equipment together for operation, a simulation system is formed, and simulation tests are carried out in the system. The active radar seeker has a complex composition and its performance index is difficult to evaluate. The RF semi-physical simulation system has the advantages of high simulation accuracy, flexible environment construction, and good repeatability. Therefore, it has been widely used in the performance evaluation of active radar seekers. Using the RF semi-physical simulation system to carry out performance evaluation tests of active radar seekers is an important means to test the indicators of active radar seekers. During the test, the RF semi-physical simulation system constructs a realistic electromagnetic environment, including a radar target environment, based on the active radar seeker evaluation indicators. Angular glint is one of the characteristics of radar targets. In the attack accuracy test of active radar seekers, it is a radar target scattering feature that needs to be simulated.

[0004] Therefore, in order to accurately evaluate the ability of active radar seekers to suppress angular glints and their attack accuracy, the angular glint simulation implementation technology should be given priority consideration in the construction of RF semi-physical simulation systems. At present, the method for implementing angular glints in RF semi-physical simulation systems is mainly to construct multiple antenna array RF feeding channels, and use each RF feeding channel to simulate a scattering point, thereby simulating the angular glint phenomenon. Since this method uses a complete RF feeding channel including a precision control unit and a switch matrix to simulate a single scattering point, and one precision control unit corresponds to a set of switch matrices, it is more suitable for situations with smaller array sizes such as linear arrays, and its application is limited, and it cannot meet the needs of semi-physical simulation tests of active radar seekers. Summary of the invention

[0005] In order to overcome the deficiencies in the background technology, the present invention discloses an angular scintillation radio frequency semi-physical simulation system based on multi-scattering point signal amplitude and phase control.

[0006] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme: An angular scintillation radio frequency semi-physical simulation system based on multi-scattering point signal amplitude and phase control includes a conversion control board, a scattering point amplitude and phase control module, a precision control module group and multiple combiners. The conversion control board converts the received information into a signal that can be received by FPGA through an interface module. The FPGA converts the received signal into a TTL interface voltage through a codeword conversion board, and controls the amplitude and phase of the scattering point amplitude and phase control module and the precision control module group. The scattering point amplitude and phase control module is composed of multiple branches, each of which includes a programmable phase shifter A and a programmable attenuator A connected in sequence, which are used to complete the control of the amplitude and phase of different scattering points; The precision control module group includes multiple power dividers, multiple precision control units and three combiners, each precision control unit corresponds to a scattering point, the input interfaces of the multiple power dividers are respectively connected to the output interfaces of multiple programmable attenuators A in multiple branches, the output interface of each power divider is respectively connected to the input end of the three precision control units, the output ends of the three precision control units are respectively connected to the input ports of the three combiners, and after the combiner completes signal combining, the output signal is fed back to the switch matrix of each branch for the selection of the triplet antenna; each precision control unit is composed of three branches, and each branch includes a programmable phase shifter B, an isolator and a programmable attenuator B connected in sequence.

[0007] Furthermore, the conversion control board adopts a standard LVDS control interface receiving circuit to receive the control signal sent by the radio frequency semi-physical simulation system through the LVDS control interface.

[0008] Furthermore, the information received by the conversion control board is: the signal amplitude, phase, azimuth, elevation angle of each scattering point in the active radar seeker antenna coordinate system, as well as the scattering point number and frequency information; the signals that the FPGA can receive are: signal amplitude, phase information as well as azimuth and elevation angle information, and the control words of the programmable attenuator A, programmable phase shifter A, programmable attenuator B, and programmable phase shifter B are generated through the codeword conversion board, and the control words are latched. The control words sent by the FPGA are converted by the output interface module and become TTL interface voltage, thereby controlling the programmable attenuator A, programmable phase shifter A, programmable attenuator B, and programmable phase shifter B for amplitude and phase control.

[0009] Furthermore, the attenuation of the programmable attenuator A and the programmable attenuator B is not less than 50 dB, the amplitude control accuracy is better than 0.1 dB, and the phase control accuracy of the programmable phase shifter A and the programmable phase shifter B is better than 1°.

[0010] Due to the adoption of the above technical solution, the present invention has the following beneficial effects: The angular scintillation radio frequency semi-physical simulation system based on amplitude and phase control of multiple scattering point signals described in the present invention simulates the real angular scintillation phenomenon based on the angular scintillation generation mechanism through the designed precise control unit, thereby simulating the multi-scattering point echo signals of the radar target without increasing the system construction cost and complexity, and realizing the real reproduction of the angular scintillation effect of the radar target; the present invention can use a single channel to realize accurate simulation of the amplitude, phase and position of multiple scattering points without increasing the switch matrix, and can truly reproduce the spatial field distribution of the echo signal of a complex radar target without increasing the equipment hardware amount, so as to accurately evaluate the suppression capability of the seeker to angular scintillation; the present invention is reasonably designed, and when simulating multiple scattering points, it effectively reduces the construction cost and reduces the system hardware scale, thereby improving the stability and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural composition block diagram of the present invention. DETAILED DESCRIPTION

[0012] The present invention can be explained in detail by the following examples, and the purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0013] Combined with Figure 1 The angular scintillation radio frequency semi-physical simulation system based on multi-scattering point signal amplitude and phase control includes a conversion control board, a scattering point amplitude and phase control module, a precision control module group and a plurality of combiners. The conversion control board converts the received information into a signal that can be received by the FPGA through the interface module. The FPGA converts the received signal into a TTL interface voltage through the conversion of the codeword conversion board, and controls the amplitude and phase of the scattering point amplitude and phase control module and the precision control module group. In specific implementation, the more sets of scattering point amplitude and phase control modules and precision control module groups there are, the more scattering points can be simulated, and the more realistic the simulated target angular flicker characteristics are; however, the required hardware cost is higher, and the system complexity is high, and the construction difficulty increases. The present invention preferably uses 4 to 6 scattering points to simulate the target's angular flicker characteristics.

[0014] The scattering point amplitude and phase control module is composed of multiple branches, each of which includes a programmable phase shifter A and a programmable attenuator A connected in sequence, which are used to complete the control of the amplitude and phase of different scattering points; since the amplitude and phase of the scattering point are one of the important factors affecting the angular scintillation effect, it is required that the attenuation of the programmable attenuator A is not less than 50dB, the amplitude control accuracy is better than 0.1dB, and the phase control accuracy of the programmable phase shifter A is better than 1° The precision control module group includes multiple power dividers, multiple precision control units and three combiners, each precision control unit corresponds to a scattering point, the input interfaces of the multiple power dividers are respectively connected to the output interfaces of multiple programmable attenuators A in multiple branches, the output interfaces of each power divider are respectively connected to the input ends of the three precision control units, and the output ends of the three precision control units are respectively connected to the input ports of the three combiners. After the combiner completes the signal combination, the output signal is fed back to the switch matrix of each branch for the selection of the triple antenna; each precision control unit is composed of three branches, each branch includes a programmable phase shifter B, an isolator and a programmable attenuator B connected in sequence, and the output interfaces of every three programmable attenuators B are respectively connected to the input ports of the three combiners; the attenuation of the programmable attenuator A and the programmable attenuator B is not less than 50dB, the amplitude control accuracy is better than 0.1dB, and the phase control accuracy of the programmable phase shifter A and the programmable phase shifter B is better than 1°; Furthermore, the number of input ports of each combiner is the same as the number of precision control units.

[0015] Furthermore, the conversion control board adopts a standard LVDS control interface receiving circuit to receive the control signal sent by the radio frequency semi-physical simulation system through the LVDS control interface; Specifically, the RF semi-physical simulation system calculates the signal amplitude, phase, azimuth and elevation angles of each scattering point in the active radar seeker antenna coordinate system in real time according to the target scattering characteristics and the spatial position relationship of the scattering points, and packages the above information together with the scattering point number and frequency, and sends it to the conversion control board of the RF simulation antenna array.

[0016] Furthermore, the information received by the conversion control board is: the signal amplitude, phase, azimuth, elevation angle of each scattering point in the active radar seeker antenna coordinate system, as well as the scattering point number and frequency information; the signal that the FPGA can receive is: signal amplitude, phase information, azimuth, and elevation information, and the control words of the programmable attenuator A, programmable phase shifter A, programmable attenuator B, and programmable phase shifter B are generated through the codeword conversion board, and the control words are latched. The control words sent by the FPGA are converted by the output interface module and become TTL interface voltages, thereby controlling the programmable attenuator A, programmable phase shifter A, programmable attenuator B, and programmable phase shifter B to perform amplitude and phase control; In the specific implementation process, the phases of the three branches of each precision control unit are adjusted to be consistent, and the simulation of the angular position of the signal within the triplet is achieved by controlling the amplitude of the triplet. Therefore, the simulated position of the scattering point is limited. In order to expand the simulated angle range of the scattering point, the phase of the precision control unit can be adjusted to make the synthetic signal deviate from the inside of the triplet, thereby further improving the simulation range of the scattering point position; when simulating multiple scattering points, only the precision control unit is added, and the switch matrix is ​​not added, which can effectively reduce the construction cost and the system hardware scale, and improve the stability and reliability of the system; The scattering point simulation is simulated by a scattering point simulator. Since a radar target requires multiple scattering points, multiple scattering point simulators need to be set up at the same time. The scattering point simulator is also called a radar target echo simulator, which is a prior art. Multiple scattering point simulators simulate corresponding multiple scattering point amplitude and phase control modules; the radio frequency semi-physical simulation system, radio frequency simulation antenna array, and switch matrix are all known technologies and will not be described in detail. The application of the present invention can improve the fidelity of complex target angular glint simulation and improve the assessment ability of the anti-angular glint effect of the active radar seeker.

[0017] Parts of the present invention not described in detail are prior art.

[0018] The embodiments selected herein for the purpose of disclosing the invention are currently considered to be suitable, but it should be understood that the invention is intended to include all changes and modifications of the embodiments that fall within the scope of the concept and invention.

Claims

1. An angular scintillation radio frequency semi-physical simulation system based on multi-scattering point signal amplitude and phase control, comprising a conversion control board, a scattering point amplitude and phase control module, a precision control module group and multiple combiners, characterized in that: The conversion control board converts the received information into a signal that can be received by the FPGA through the interface module. The FPGA converts the received signal into a TTL interface voltage through the conversion of the codeword conversion board to control the amplitude and phase of the scattering point amplitude and phase control module and the precision control module group; The scattering point amplitude and phase control module is composed of multiple branches, each of which includes a programmable phase shifter A and a programmable attenuator A connected in sequence, which are used to complete the control of the amplitude and phase of different scattering points; The precision control module group includes multiple power dividers, multiple precision control units and three combiners, each precision control unit corresponds to a scattering point, the input interfaces of the multiple power dividers are respectively connected to the output interfaces of multiple programmable attenuators A in multiple branches, the output interface of each power divider is respectively connected to the input end of the three precision control units, the output ends of the three precision control units are respectively connected to the input ports of the three combiners, and after the combiner completes signal combining, the output signal is fed back to the switch matrix of each branch for the selection of the triplet antenna; each precision control unit is composed of three branches, and each branch includes a programmable phase shifter B, an isolator and a programmable attenuator B connected in sequence.

2. The angular scintillation radio frequency semi-physical simulation system based on multi-scattering point signal amplitude and phase control according to claim 1 is characterized in that: The conversion control board adopts a standard LVDS control interface receiving circuit to receive the control signal sent by the radio frequency semi-physical simulation system through the LVDS control interface.

3. The angular scintillation radio frequency semi-physical simulation system based on multi-scattering point signal amplitude and phase control according to claim 1 is characterized in that: The information received by the conversion control board is: the signal amplitude, phase, azimuth, elevation angle of each scattering point in the active radar seeker antenna coordinate system, as well as the scattering point number and frequency information; the signals that the FPGA can receive are: signal amplitude, phase information as well as azimuth and elevation angle information. The control words of the programmable attenuator A, programmable phase shifter A, programmable attenuator B and programmable phase shifter B are generated through the codeword conversion board and the control words are latched. The control words sent by the FPGA are converted by the output interface module and become TTL interface voltage, thereby controlling the programmable attenuator A, programmable phase shifter A, programmable attenuator B and programmable phase shifter B for amplitude and phase control.

4. The angular scintillation radio frequency semi-physical simulation system based on multi-scattering point signal amplitude and phase control according to claim 1 is characterized in that: The attenuation of the programmable attenuator A and the programmable attenuator B is not less than 50dB, the amplitude control accuracy is better than 0.1dB, and the phase control accuracy of the programmable phase shifter A and the programmable phase shifter B is better than 1°.

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