CN114326433A - Single-channel digital group target realization method and system - Google Patents
Single-channel digital group target realization method and system Download PDFInfo
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Abstract
The invention discloses a method and a system for realizing a single-channel digital group target, wherein the system comprises the following steps: the microwave anechoic chamber radiation system comprises a three-channel target simulator, a coarse position control unit, a spherical array structure, a radiation unit, a connecting cable and an integrated simulation control system, wherein the spherical array structure is installed and fixed on a special foundation in a microwave anechoic chamber, the radiation unit is installed on the spherical array structure, the radiation unit is sequentially connected with the coarse position control unit and the three-channel target simulator through the connecting cable, and the integrated simulation control system is used for controlling the three-channel target simulator and the coarse position control unit to work cooperatively. The invention adopts a digital scheme to realize the angle expansion of the group targets in a single channel, the scheme has the advantages of high cost performance, less equipment quantity, simple test configuration, high test efficiency and the like, can provide a reliable test means for the development and performance parameter evaluation of high-resolution radio guidance equipment, and can greatly promote the development of the domestic radio frequency simulation test technology.
Description
Technical Field
The invention relates to a method and a system for realizing a single-channel digital group target, belonging to the technical field of radio frequency semi-physical simulation of electronic information engineering.
Background
Multiple tests are needed in the development and identification process of the aircraft radio system, problems can be found as early as possible through the tests, and the design of the system is optimized continuously. The radio frequency semi-physical simulation technology is a technical scheme with high economic benefit, repeatability, strong adaptability and high confidence coefficient in various test schemes, and is more and more widely applied to the field of military at home and abroad.
With the rapid development of the radio guidance technology of the aircraft, the resolving power and function of the radio guidance device are continuously improved, the size of the group target is much larger than that of the radio guidance device resolving unit, and the radio guidance device needs to acquire not only the position information and the speed information of the group target, but also the shape, the motion state and other information of the group target. At this point, the group target can no longer be treated as a simple point target, but rather as a target with multiple scattering centers or an extended target with geometric properties. The radio frequency semi-physical simulation system is used as an important means for simulation test and test of radio guidance equipment, and needs to complete simulation of a multi-scattering center target or an extended target in order to ensure the fidelity of electromagnetic environment simulation and group target characteristic simulation.
At present, the built and started radio frequency semi-physical simulation test system in China realizes the simulation of a multi-scattering center target or an extended target by the following two schemes:
1. for a radial expansion group target of radio guidance equipment, a one-dimensional range profile expansion target echo simulation mode is generally adopted for realization, and the realization scheme is mature; however, the disadvantage of this method is that only the radial expansion group target can be realized, and the angle expansion group target cannot be realized;
2. aiming at the angle expansion group target of the radio guidance equipment, the method is generally realized by adopting a multi-channel combination mode, namely, each independent channel realizes the simulation of one scattering point, and a plurality of independent channels complete the simulation of a plurality of scattering points by cooperative work; the disadvantage of this approach is that the number of independent scattering points implemented by this solution is limited to the number of independent channels, and only a few scattering points can be simulated, and if the simulation of a group target or an extended target with more scattering centers is desired, the required equipment amount and construction cost will be greatly increased, and therefore, this implementation solution has gradually failed to meet the simulation test requirement of the high-resolution radio guidance equipment.
According to the scheme, the existing angle expansion group target implementation method has technical defects, is large in equipment quantity and high in cost, cannot meet the requirement of a high cost performance simulation test of high-resolution radio guidance equipment in a laboratory environment, and seriously restricts the development of a radio frequency simulation technology and the simulation test of the high-resolution radio guidance equipment.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a method and a system for realizing a single-channel digital group target, wherein a digital scheme is adopted in a single channel to realize the angle expansion of the group target, the scheme has the advantages of high cost performance, less equipment quantity, simple test configuration, high test efficiency and the like, can provide a reliable test means for the development and performance parameter evaluation of high-resolution radio guidance equipment, and can greatly promote the development of a domestic radio frequency simulation test technology.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
in a first aspect, the present invention provides a single-channel digital group object realization system, including: the microwave anechoic chamber radiation system comprises a three-channel target simulator, a coarse position control unit, a spherical array structure, a radiation unit, a connecting cable and an integrated simulation control system, wherein the spherical array structure is installed and fixed on a special foundation in a microwave anechoic chamber, the radiation unit is installed on the spherical array structure, the radiation unit is sequentially connected with the coarse position control unit and the three-channel target simulator through the connecting cable, and the integrated simulation control system is used for controlling the three-channel target simulator and the coarse position control unit to work cooperatively.
Furthermore, the connection cable comprises a radio frequency cable, a power line and a control line, and is used for completing interconnection and intercommunication of transmission signals among the devices.
Furthermore, the spherical array structure comprises a spherical screen, a supporting structure of the spherical screen and a maintenance platform, and the spherical screen is provided with a radiation antenna to form the radiation unit.
Furthermore, the spherical array structure is a spherical crown area array, and three groups of radiation antennas are installed in a triple combination mode.
Furthermore, the rear parts of the three groups of radiation antennas are connected with radio frequency cables, and are sequentially connected with the coarse control unit and the three-channel target simulator through the radio frequency cables.
Further, the method also comprises the following steps: and the power supply equipment is respectively connected with the three-channel target simulator and the coarse control unit through power lines.
Furthermore, the integrated simulation control system is respectively connected with the three-channel target simulator and the coarse position control unit through control lines, and is used for realizing cooperative control over the three-channel target simulator, the coarse position control unit and other equipment according to scene setting conditions.
Furthermore, the three-channel target simulator comprises a signal modulation unit and a digital precise control unit, and is used for signal modulation and digital precise control.
In a second aspect, the present invention provides a method for implementing a single-channel digitized group target, in which a three-channel target simulator implements digital control of fine bits and modulation of target echoes, the three-channel target simulator includes a signal modulation unit and a digital fine bit control unit, and is configured to perform signal modulation and digital fine bit control, and the method includes:
the method comprises the steps that an input signal enters an FPGA after microwave down-conversion and AD conversion, target echo modulation is carried out in the FPGA, and three groups of accurate bits are modulated and controlled in a digital domain in the FPGA to obtain three paths of modulated target echo signals and interference signals;
respectively carrying out digital up-conversion and DA conversion on the target echo signal and the interference signal, and carrying out microwave up-conversion to obtain three paths of modulated radio frequency output signals;
and inputting the three paths of radio frequency output signals into a coarse control unit, and realizing the simulation requirement of group target angle expansion under a single channel through the cooperative work of the digital fine control unit and the coarse control unit.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a method and a system for realizing a single-channel digital group target, which realize the angle expansion of the group target by adopting a digital scheme in a single channel, wherein the scheme has the advantages of high cost performance, less equipment quantity, simple test configuration, high test efficiency and the like, can provide a reliable test means for the development and performance parameter evaluation of high-resolution radio guidance equipment, and can greatly promote the development of a domestic radio frequency simulation test technology.
Drawings
Fig. 1 is a system composition and operation schematic diagram of a single-channel digital group object implementation system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the operation of a three-channel target simulator connection provided by an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
Example 1
As shown in fig. 1, this embodiment introduces a single-channel digital group object implementation system, which includes:
the system comprises a three-channel target simulator, a coarse control unit, a power supply device, a spherical array structure, a radiation unit, an integrated simulation control system, connecting cables (a radio frequency cable, a power line and a control line) and the like, as shown in figure 1. The spherical array structure is installed and fixed on a special foundation in the microwave darkroom. The spherical screen is provided with a radiation antenna, the rear part of the radiation antenna is connected with a radio frequency cable, the radio frequency cable is sequentially connected with a coarse position control unit and a three-channel target simulator, an integrated simulation control system is respectively connected with the three-channel target simulator and the coarse position control unit through control lines, and power supply equipment respectively provides required power for electric equipment such as the three-channel target simulator and the coarse position control unit through power lines.
The three-channel simulator realizes signal modulation, digital precise control and the like; the coarse control unit realizes analog coarse control; the power supply equipment provides power for equipment such as a three-channel target simulator, a coarse control unit and the like; the spherical array structure is used for providing mounting carriers for the radiation unit, the coarse control unit, the connecting cable and the like; the radiation unit is used for modulating the radiation of the signal; the integrated simulation control system realizes cooperative control of the three-channel target simulator, the coarse control unit and other equipment according to the scene setting condition; the connecting cable is used for completing interconnection and intercommunication of transmission signals among all the devices.
The system provided by the invention is different from the traditional radio frequency simulation system in the greatest way and is innovative in that an original simulation precise control unit is abandoned, precise control and an original single-channel target simulator are integrally designed (called as a three-channel target simulator), precise modulation required by triple target synthesis is realized in a digital domain of the three-channel target simulator, and therefore, the simulation requirement of group targets under a single channel can be efficiently and conveniently realized. Meanwhile, in order to adapt to the design change, the original control system is improved, and the new control system can realize the integrated control of target simulation, digital fine bit and coarse bit.
Example 2
As shown in fig. 2, this embodiment provides a method for implementing a single-channel digitized group target, in which a three-channel target simulator implements digital control of fine bits and modulation of target echoes, the three-channel target simulator includes a signal modulation unit and a digital fine bit control unit, and is configured to perform signal modulation and digital fine bit control, and the method includes:
the method comprises the steps that an input signal enters an FPGA after microwave down-conversion and AD conversion, target echo modulation is carried out in the FPGA, and three groups of accurate bits are modulated and controlled in a digital domain in the FPGA to obtain three paths of modulated target echo signals and interference signals;
respectively carrying out digital up-conversion and DA conversion on the target echo signal and the interference signal, and carrying out microwave up-conversion to obtain three paths of modulated radio frequency output signals;
and inputting the three paths of radio frequency output signals into a coarse control unit, and realizing the simulation requirement of group target angle expansion under a single channel through the cooperative work of the digital fine control unit and the coarse control unit.
The application process of the single-channel digital group target implementation method provided by the embodiment specifically relates to the following steps:
step one, adopting a three-channel target simulator to input an input signal (such as a signal transmitted by tested equipment) into an FPGA after microwave down-conversion and AD conversion;
secondly, performing target echo modulation in the FPGA, and simultaneously performing modulation control on the ternary precision bits in a digital domain in the FPGA; obtaining three paths of modulated target echo signals and interference signals;
and step three, after digital up-conversion and DA conversion are respectively carried out on the three paths of target echoes and the three paths of interference signals, three paths of modulated radio frequency output signals are obtained through microwave up-conversion. At the moment, each target simulator corresponds to one input signal and three modulated output signals;
and step four, directly inputting the output signals of three branches of the three-channel target simulator into a coarse control unit. Under the control of the integrated simulation control system, the digital precise control unit and the coarse control unit of the three-channel target simulator work together, so that the simulation requirement of group target angle expansion under a single channel can be met.
The main system parameters are as follows:
1) the working frequency range is as follows: 2 GHz-18 GHz;
2) field angle (relative turntable center): typically 45 ° × 45 ° (azimuth × pitch), flexibly customisable as required;
3) antenna array form: spherical crown area array, the target adopts triple synthesis mode;
4) adaptation of signal instantaneous bandwidth: not less than 600 MHz;
5) number of single-channel analog group targets: not less than 20;
6) group target expansion angle: not less than 5.
As shown in fig. 1 and fig. 2, in this embodiment, to implement angle expansion simulation of a group target signal, while implementing target echo modulation in an FPGA, control precise bits required for triplet target synthesis is implemented in a digital domain, a simulation precise bit control unit in the prior art is abandoned, and precise bit control is digitized, so that a three-channel target simulator is obtained by performing integrated design with a single-channel target simulator, and under the control of an integrated simulation control system, the three-channel target simulator and a coarse bit control unit work cooperatively, so that a simulation requirement of group target angle expansion under a single channel can be implemented.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A single channel digital group goal implementation system, comprising: the microwave anechoic chamber radiation system comprises a three-channel target simulator, a coarse position control unit, a spherical array structure, a radiation unit, a connecting cable and an integrated simulation control system, wherein the spherical array structure is installed and fixed on a special foundation in a microwave anechoic chamber, the radiation unit is installed on the spherical array structure, the radiation unit is sequentially connected with the coarse position control unit and the three-channel target simulator through the connecting cable, and the integrated simulation control system is used for controlling the three-channel target simulator and the coarse position control unit to work cooperatively.
2. The single-channel digitized group-goal implementation system of claim 1 wherein: the connecting cable comprises a radio frequency cable, a power line and a control line and is used for completing interconnection and intercommunication of transmission signals among all devices.
3. The single-channel digitized group-goal implementation system of claim 2 wherein: the spherical array structure comprises a spherical screen, a supporting structure of the spherical screen and a maintenance platform, wherein the spherical screen is provided with a radiation antenna to form the radiation unit.
4. The single-channel digitized group-goal implementation system of claim 3 wherein: the spherical array structure is a spherical crown area array, and three groups of radiation antennas are installed in a triple combination mode.
5. The single-channel digitized group-goal implementation system of claim 4 wherein: the rear parts of the three groups of radiation antennas are connected with radio frequency cables, and are sequentially connected with the coarse control unit and the three-channel target simulator through the radio frequency cables.
6. The single-channel digitized group-goal implementation system of claim 1 wherein: further comprising: and the power supply equipment is respectively connected with the three-channel target simulator and the coarse control unit through power lines.
7. The single-channel digitized group-goal implementation system of claim 1 wherein: the integrated simulation control system is respectively connected with the three-channel target simulator and the coarse position control unit through control lines and is used for realizing cooperative control over the three-channel target simulator, the coarse position control unit and other equipment according to scene setting conditions.
8. The single channel digitization group goal implementation system of claim 7, wherein: the three-channel target simulator comprises a signal modulation unit and a digital precise bit control unit, and is used for signal modulation and digital precise bit control.
9. A single-channel digital group target realization method is characterized in that a three-channel target simulator realizes the digital control of precise bits and the modulation of target echoes, the three-channel target simulator comprises a signal modulation unit and a digital precise bit control unit, and the signal modulation and digital precise bit control are carried out by the three-channel target simulator, and the method comprises the following steps:
the method comprises the steps that an input signal enters an FPGA after microwave down-conversion and AD conversion, target echo modulation is carried out in the FPGA, and three groups of accurate bits are modulated and controlled in a digital domain in the FPGA to obtain three paths of modulated target echo signals and interference signals;
respectively carrying out digital up-conversion and DA conversion on the target echo signal and the interference signal, and carrying out microwave up-conversion to obtain three paths of modulated radio frequency output signals;
and inputting the three paths of radio frequency output signals into a coarse control unit, and realizing the simulation requirement of group target angle expansion under a single channel through the cooperative work of the digital fine control unit and the coarse control unit.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117177280A (en) * | 2023-11-03 | 2023-12-05 | 北京理工雷科电子信息技术有限公司 | Volume target triplet simulation system based on digital modulation |
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