CN111562553A - Method for improving radio frequency semi-physical simulation broadband signal angle simulation precision - Google Patents
Method for improving radio frequency semi-physical simulation broadband signal angle simulation precision Download PDFInfo
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- G—PHYSICS
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
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- G01S7/4082—Means for monitoring or calibrating by simulation of echoes using externally generated reference signals, e.g. via remote reflector or transponder
Abstract
The invention relates to the technical field of simulation systems, and discloses a method for improving the angular simulation precision of radio frequency semi-physical simulation broadband signals, which adopts a system of angular simulation precision and comprises the following steps: the antenna array comprises a signal simulation unit, an antenna array feed channel unit and a measurement unit, wherein the signal simulation unit consists of a signal resolving module, an intermediate frequency generation module and a radio frequency generation module, is used for simulating and generating a broadband radio frequency signal for simulation, and can control the amplitude phase of the signal as required; the antenna array feed channel consists of a power amplifier, a switch matrix, a radio frequency cable and the like and is used for transmitting the broadband signals generated by the signal simulation unit to different radiation positions of the antenna array; the invention realizes the digital amplitude phase calibration of the radar signal under the broadband condition by optimizing the radio frequency link structure of the traditional radio frequency simulation system, has good operability and high efficiency, and can obviously improve the simulation precision of the radio frequency semi-physical simulation broadband signal angle.
Description
Technical Field
The invention relates to the technical field of simulation systems, in particular to a method for improving simulation precision of a radio frequency semi-physical simulation broadband signal angle.
Background
In a radio frequency semi-physical simulation system, radar target simulation is mainly completed by a triple antenna array. The radio frequency semi-physical simulation system comprises: the simulation system is formed by connecting the mathematical model, the physical effect model and the actual system and is used for carrying out simulation tests or carrying out related research. Antenna array: the antenna mainly comprises a radio frequency feed channel, a control computer and a spherical antenna array, wherein when the antenna works, the radio frequency feed channel feeds radio frequency signals to each radiation unit of the antenna array according to certain amplitude and phase under the control of the control computer, and the continuous motion of targets such as radars and the like in azimuth angles and pitch angles is simulated. Triplet: the target signal simulated by the simulation system is represented by a composite signal of three adjacent units on the antenna array, wherein the three units are arranged according to an equilateral triangle to form a subarray, which is called a triad.
The radio frequency target simulation by utilizing the antenna array has the advantage of being convenient for simulating complex targets and environments, and is a simulation method generally adopted at home and abroad at present. The method utilizes the amplitude gravity center principle provided by Boeing company to realize the accurate simulation of the radar target position on the antenna array by controlling the amplitude and the phase of the triple group. During radio frequency semi-physical simulation, one path of radar signals generated by the signal simulator is divided into three paths by the power divider, an antenna array triple in which the radar signals are located is calculated according to the target position, the three paths of signals are switched to the radiation units corresponding to the top points of the triple through the radio frequency switch network, and the amplitude phase of each radiation unit of the triple is respectively controlled through attenuators and phase shifters on the three branches, so that the target can move at any position in the triple.
However, in the conventional method, single frequency point control words are used for realizing the amplitude-phase control of signals through narrow-band radio frequency devices such as an attenuator and a phase shifter, so that the angular analog precision of the narrow-band signals is still guaranteed, but the amplitude-phase modulation of the wide-band signals in the bandwidth is difficult to realize, and the requirement of the amplitude-gravity principle on the amplitude-phase control of the wide-band signals cannot be met.
At present, radio frequency semi-physical simulation generally controls the amplitude and phase of a signal through narrow-band radio frequency devices such as an attenuator, a phase shifter and the like, so that the angle simulation precision of a narrow-band signal can be ensured, and an effective method for realizing high-precision angle position simulation of a wide-band signal is not available.
The consistency of the amplitude-frequency characteristic and the phase-frequency characteristic of each feed channel radio frequency device is strictly controlled by customizing the devices such as an attenuator, a phase shifter and the like in an antenna array feed channel and debugging and screening in the production process, so that the angle simulation precision of broadband signals can be improved.
Disclosure of Invention
In order to improve the simulation precision of the radio frequency simulation broadband signal angle, the invention provides a method for improving the simulation precision of the radio frequency semi-physical simulation broadband signal angle.
In order to achieve the purpose, the invention adopts the technical scheme that:
a system for improving radio frequency semi-physical simulation broadband signal angle simulation precision comprises: the antenna array comprises a signal simulation unit, an antenna array feed channel unit and a measurement unit, wherein the signal simulation unit consists of a signal resolving module, an intermediate frequency generation module and a radio frequency generation module, is used for simulating and generating a broadband radio frequency signal for simulation, and can control the amplitude phase of the signal as required; the antenna array feed channel consists of a power amplifier, a switch matrix, a radio frequency cable and the like and is used for transmitting the broadband signals generated by the signal simulation unit to different radiation positions of the antenna array; the measurement unit is used for measuring parameters of a radio frequency link jointly formed by the signal simulation unit and the antenna array feed channel unit, wherein the measurement unit is used for measuring amplitude-frequency characteristics and phase-frequency characteristics and providing reference data for amplitude-phase calibration of broadband signals.
A system for improving the simulation precision of radio frequency semi-physical simulation broadband signal angles is characterized in that a signal simulation unit consists of a signal resolving module, an intermediate frequency generation module and a radio frequency generation module, is used for simulating and generating a broadband radio frequency signal for simulation, and can control the amplitude phase of the signal according to the requirement;
the signal resolving module is a commercial computing workstation, wherein a central processing unit is not lower than an Intel core i7 and is used for calculating pulse description words including frequency, pulse width and repetition frequency of signals according to radio frequency simulation requirements, and sending the pulse description words to the intermediate frequency generating module through a PCIe bus, and the intermediate frequency generating module is inserted into a PCIe slot of the computing workstation in a board card mode;
the intermediate frequency generation module consists of a high-speed DAC, a programmable logic device (FPGA), a high-speed data memory device (PROM) and a low-pass filter (LPF), and is used for retrieving corresponding complete-period sine wave data stored in the PROM according to the pulse description word, generating a digital signal through frequency synthesis and inputting the digital signal into the DAC, outputting an analog signal by the DAC, and obtaining an intermediate frequency signal with pure frequency spectrum through the LPF;
the radio frequency generation module consists of a crystal oscillator, a frequency mixer and a filter and is used for carrying out frequency conversion, filtering and amplification processing on the intermediate frequency signal to generate a radio frequency signal, and the generated radio frequency signal is sent to the antenna array feed channel unit;
the signal simulation unit has three signal channels, and provides three paths of signals for the antenna array triad respectively, and the programmable design architecture is adopted by the signal simulation unit, so that the intermediate frequency signal frequency synthesis has higher programmability, and the possibility of flexibly modulating the amplitude and the phase of the signal within a certain bandwidth is provided.
A system for improving the simulation precision of a radio frequency semi-physical simulation broadband signal angle is disclosed, wherein an antenna array feed channel unit consists of a power amplifier and a switch matrix, and a first power amplifier is connected with a second power amplifier through the switch matrix; the power amplifier is used for compensating power loss in the signal transmission process; the switch matrix is composed of a plurality of radio frequency electronic switches and used for switching signal transmission paths so that signals are radiated from the specified radiation units of the antenna array.
A system for improving the simulation precision of radio frequency semi-physical simulation broadband signal angles is characterized in that a measuring unit consists of a receiving antenna and a vector network analyzer, wherein the vector network analyzer receives a reference signal and a radio frequency signal radiated by an antenna array, measures the amplitude and phase of the signal in a bandwidth, so that the amplitude-frequency and phase-frequency characteristics of a triple transmission link are obtained, and data recording is carried out according to the measurement of the amplitude-frequency and phase-frequency of the broadband signal; broadband signal amplitude-frequency and phase-frequency measurement data:
number 1, center frequency (GHz) f0Amplitude (dBm) E0Phase (°) phi0；
……………………………………………………………
Number n, center frequency (GHz) fnAmplitude (dBm) EnPhase (°) phin；
f0For the starting frequency, f, of the broadband signalnFor the termination frequency of the wideband signal, the bandwidth B ═ fn–f0Amplitude and phase measurements are taken in steps of Δ f over the bandwidth (Δ f is taken to be 50 MHz);
a system for improving the simulation precision of a radio frequency semi-physical simulation broadband signal angle is characterized in that a signal simulation unit, an antenna array feed channel unit and a measurement unit are provided with connection interfaces, and the connection interfaces comprise an interface between units and an interface inside the unit;
interface between the units:
(1) the interface between the signal simulation unit and the antenna array feed channel unit adopts a standard SMA interface;
(2) the interface between the measuring unit and the signal simulation unit adopts a standard SMA interface;
unit internal interface:
(1) the signal resolving module and the intermediate frequency generating module adopt a standard PCIe interface, and the intermediate frequency generating module and the radio frequency generating module adopt a standard SMA interface;
(2) the antenna array feed channel unit internal interface adopts a standard SMA interface among radio frequency devices such as power amplifiers, electronic switches and the like in the antenna array feed channel unit;
a method for improving radio frequency semi-physical simulation broadband signal angle simulation precision specifically comprises the following implementation steps of calibrating a system:
(1) the measurement unit is used for measuring the amplitude-frequency characteristic and the phase-frequency characteristic of each radio frequency channel of the antenna array feed channel unit, the bandwidth range is selected according to the actual use requirement,
carrying out data recording according to the measurement of the amplitude frequency and the phase frequency of the broadband signal;
broadband signal amplitude-frequency and phase-frequency measurement data:
number 1, center frequency (GHz) f0Amplitude (dBm) E0Phase (°) phi0；
……………………………………………………………
Number n, center frequency (GHz) fnAmplitude (dBm) EnPhase (°) of)Φn；
f0For the starting frequency, f, of the broadband signalnFor the termination frequency of the wideband signal, the bandwidth B ═ fn–f0Amplitude and phase measurements are taken in steps of Δ f over the bandwidth (Δ f is taken to be 50 MHz);
(2) taking the minimum value of the amplitude of each frequency point as the reference amplitude EstdTaking 10 degrees as a reference phase phistdCalculating the amplitude and phase calibration value of each frequency point according to the following formula, and carrying out data recording according to the amplitude frequency and phase frequency calibration of the broadband signal;
ΔE0＝E0-Estd
ΔΦ0＝Φ0-Φstd
the amplitude-frequency and phase-frequency calibration relation of the broadband signal is as follows:
number 1 center frequency (GHz) f0Amplitude calibration value (dB) Δ E0Phase calibration value (°) Δ Φ0；
………………………………………………………………………………………
N-order center frequency (GHz) fnAmplitude calibration value (dB) Δ EnPhase calibration value (°) Δ Φn；
(3) An amplitude-phase calibration table is manufactured according to data of the amplitude-frequency and phase-frequency calibration relation of the broadband signal and loaded into a high-speed data memory of a signal simulation unit, and when the broadband signal is generated through simulation, the signal simulation unit carries out pre-distortion modulation on the amplitude and the phase of each frequency point in a signal bandwidth according to the amplitude-phase calibration data;
(4) the signal simulation unit sends the modulated broadband signal to the antenna array feed channel unit, and after the signal passes through the complete feed link, the broadband signal with improved amplitude-frequency characteristics and phase-frequency characteristics is obtained at the triple radiation unit, so that the angular simulation precision of the broadband signal is improved.
Due to the adoption of the technical scheme, the invention has the following advantages:
a method for improving the simulation precision of a radio frequency semi-physical simulation broadband signal angle is a novel broadband signal simulation method, and the method realizes the digital amplitude phase calibration of radar signals under the broadband condition by optimizing the radio frequency link structure of the traditional radio frequency simulation system, has good operability and high efficiency, and can obviously improve the simulation precision of the radio frequency semi-physical simulation broadband signal angle. The antenna array triple angular position simulation method breaks through the traditional 'one-to-three' antenna array triple angular position simulation method, three independent signal simulation channels are adopted, the traditional analog signal modulation mode is replaced by a digital modulation mode, the amplitude-frequency characteristic and the phase-frequency characteristic of a triple signal are flexibly controlled in a certain bandwidth range, the amplitude-phase consistency of the triple signal is improved, special requirements for the consistency of radio frequency devices are not needed, the amplitude-frequency characteristic and the phase-frequency characteristic of each channel are measured only through measuring equipment, and the signal amplitude and the phase in the bandwidth are modulated by a digitization method in a broadband signal generation stage according to the measurement result, so that the broadband signal angular position simulation precision of radio frequency semi-physical simulation can be effectively improved, and the simulation test requirements of broadband equipment are met. The method can improve the simulation precision of the broadband signal angle in radio frequency simulation, and can also be popularized and applied to other broadband radio frequency systems.
Drawings
FIG. 1 is a schematic diagram of a system for improving the simulation precision of a radio frequency semi-physical simulation broadband signal angle.
Fig. 2 is a schematic diagram of the antenna array feed channel unit.
Detailed Description
In order to better understand the technical solution of the present invention, the following description will further describe the embodiments of the present invention with reference to the accompanying drawings.
As shown in fig. 1 and 2, the structure of the feed channel of the conventional antenna array is optimized, no special requirement is required for consistency of radio frequency devices, only the amplitude-frequency characteristic and the phase-frequency characteristic of each channel are measured by measuring equipment, and the amplitude and the phase of a signal in a bandwidth are modulated by a digitization method at a broadband signal generation stage according to a measurement result, so that the angular simulation precision of a broadband signal can be effectively improved.
The system for improving the simulation precision of the radio frequency semi-physical simulation broadband signal angle mainly comprises a signal simulation unit, an antenna array feed channel unit, a measurement unit and the like. The signal simulation unit is composed of a signal resolving module, an intermediate frequency generation module, a radio frequency generation module and the like, is mainly used for simulating and generating broadband radio frequency signals for simulation, and can control the amplitude phase of the signals according to the requirement; the antenna array feed channel consists of a power amplifier, a switch matrix, a radio frequency cable and the like and is mainly used for transmitting the broadband signals generated by the signal simulation unit to different radiation positions of the antenna array; the measurement unit is mainly used for performing parameter measurement on a radio frequency link jointly formed by the signal simulation unit and the antenna array feed channel unit, wherein the parameter measurement includes amplitude-frequency characteristic measurement and phase-frequency characteristic measurement, and provides reference data for amplitude-phase calibration of broadband signals. The system structure composition is shown in figure 1.
Signal simulating unit
The signal simulation unit is the core part of the invention and mainly comprises a signal resolving module, an intermediate frequency generation module and a radio frequency generation module. The signal resolving module is mainly a commercial computing workstation, a central processing unit is not lower than an Intel core i7, and is mainly used for computing pulse description words of signals according to radio frequency simulation requirements, wherein the pulse description words comprise frequency, pulse width, repetition frequency and the like, and the pulse description words are sent to the intermediate frequency generating module through a PCIe bus, and the intermediate frequency generating module is inserted into a PCIe slot of the computing workstation in a board card mode; the intermediate frequency generation module mainly comprises a high-speed DAC (digital-to-analog converter), a programmable logic device (FPGA), a high-speed data memory device (PROM), a low-pass filter (LPF) and the like, and is mainly used for retrieving corresponding complete-period sine wave data stored in the PROM according to a pulse description word, generating a digital signal through frequency synthesis and inputting the digital signal into the DAC, outputting an analog signal by the DAC, and obtaining an intermediate frequency signal with pure frequency spectrum through the LPF; the radio frequency generation module mainly comprises a crystal oscillator, a mixer, a filter and the like, and is mainly used for carrying out frequency conversion, filtering, amplification and other processing on the intermediate frequency signal to generate a radio frequency signal, and the generated radio frequency signal is sent to the antenna array feed channel unit.
The signal simulation unit has three signal channels in total and provides three signals for the antenna array triad respectively. Because the signal simulation unit adopts a programmable design framework, the intermediate frequency signal frequency synthesis has higher programmability, and the possibility of flexibly modulating the amplitude and the phase of the signal within a certain bandwidth is provided.
Antenna array feed channel unit
The antenna array feed channel unit comprises a power amplifier, a switch matrix and the like. The power amplifier is mainly used for compensating power loss in the signal transmission process; the switch matrix is composed of a plurality of radio frequency electronic switches and is mainly used for switching signal transmission paths so that signals are radiated from the specified radiation units of the antenna array. The schematic diagram of the antenna array feed channel unit is shown in fig. 2:
(III) measurement Unit
The measuring unit mainly comprises a receiving antenna, a vector network analyzer and the like, the signal simulation unit is used for generating a radio frequency signal and coupling out a path of signal to be used as a reference signal to be sent to the vector network analyzer, the vector network analyzer is used for receiving the reference signal and the radio frequency signal radiated by the antenna array and measuring the amplitude and the phase of the signal in a specified bandwidth, so that the amplitude-frequency and phase-frequency characteristics of the triple transmission link are obtained, and data recording is carried out according to the format shown in the table 1. In table f0For the starting frequency, f, of the broadband signalnFor the termination frequency of the wideband signal, the bandwidth B ═ fn–f0Amplitude and phase measurements are taken in steps of Δ f over the bandwidth (Δ f taken to be 50 MHz).
TABLE 1 broadband signal amplitude-frequency and phase-frequency measuring meter
Interface scheme
Inter-cell interface
(1) Interface between signal simulation unit and antenna array feed channel unit
A standard SMA interface is used.
(2) Interface between measuring unit and signal simulation unit
A standard SMA interface is used.
Unit internal interface
(1) Internal interface of signal simulation unit
A standard PCIe interface is adopted between the signal resolving module and the intermediate frequency generating module, and a standard SMA interface is adopted between the intermediate frequency generating module and the radio frequency generating module.
(2) Internal interface of antenna array feed channel unit
And standard SMA interfaces are adopted among the radio frequency devices such as power amplifiers, electronic switches and the like in the antenna array feed channel unit.
Detailed description of the invention
The system was calibrated as follows:
(1) and measuring the amplitude-frequency characteristic and the phase-frequency characteristic of each radio frequency channel of the antenna array feed channel unit by using the measuring unit, selecting a bandwidth range according to actual use requirements, measuring according to the content required by the table 1 and recording data.
(2) Taking the minimum value of the amplitude of each frequency point as the reference amplitude EstdTaking 10 degrees as a reference phase phistdAnd calculating the amplitude and phase calibration value of each frequency point according to the following formula, and recording data according to the format shown in the table 2.
ΔE0＝E0-Estd
ΔΦ0＝Φ0-Φstd
TABLE 2 broadband signal amplitude-frequency and phase-frequency calibration table
(3) And (3) making an amplitude and phase calibration table according to the data in the table 2, and loading the amplitude and phase calibration table into a high-speed data memory of the signal simulation unit, wherein the signal simulation unit performs predistortion modulation on the amplitude and phase of each frequency point in the signal bandwidth according to the amplitude and phase calibration data when a broadband signal is generated through simulation.
(4) The signal simulation unit sends the modulated broadband signal to the antenna array feed channel unit, and after the signal passes through the complete feed link, the broadband signal with improved amplitude-frequency characteristics and phase-frequency characteristics is obtained at the triple radiation unit, so that the angular simulation precision of the broadband signal is improved.
The invention relates to a broadband signal angle simulation precision improving method based on a digital signal amplitude-phase pre-modulation technology, which is used for improving the radio frequency link amplitude-frequency characteristic and phase-frequency characteristic calibration of the broadband signal angle simulation precision. The system constructed for improving the simulation precision of the radio frequency simulation broadband signal angle is short in development period.
Claims (6)
1. A system for improving radio frequency semi-physical simulation broadband signal angle simulation precision is characterized in that: the method comprises the following steps: the antenna array comprises a signal simulation unit, an antenna array feed channel unit and a measurement unit, wherein the signal simulation unit consists of a signal resolving module, an intermediate frequency generation module and a radio frequency generation module, is used for simulating and generating a broadband radio frequency signal for simulation, and can control the amplitude phase of the signal as required; the antenna array feed channel consists of a power amplifier, a switch matrix, a radio frequency cable and the like and is used for transmitting the broadband signals generated by the signal simulation unit to different radiation positions of the antenna array; the measurement unit is used for measuring parameters of a radio frequency link jointly formed by the signal simulation unit and the antenna array feed channel unit, wherein the measurement unit is used for measuring amplitude-frequency characteristics and phase-frequency characteristics and providing reference data for amplitude-phase calibration of broadband signals.
2. The system for improving the simulation precision of the radio frequency semi-physical simulation broadband signal angle according to claim 1, wherein the signal simulation unit is composed of a signal resolving module, an intermediate frequency generating module and a radio frequency generating module, is used for simulating and generating a broadband radio frequency signal for simulation, and can control the amplitude phase of the signal as required;
the signal resolving module is a commercial computing workstation, wherein a central processing unit is not lower than an Intel core i7 and is used for calculating pulse description words including frequency, pulse width and repetition frequency of signals according to radio frequency simulation requirements, and sending the pulse description words to the intermediate frequency generating module through a PCIe bus, and the intermediate frequency generating module is inserted into a PCIe slot of the computing workstation in a board card mode;
the intermediate frequency generation module consists of a high-speed DAC, a programmable logic device (FPGA), a high-speed data memory device (PROM) and a low-pass filter (LPF), and is used for retrieving corresponding complete-period sine wave data stored in the PROM according to the pulse description word, generating a digital signal through frequency synthesis and inputting the digital signal into the DAC, outputting an analog signal by the DAC, and obtaining an intermediate frequency signal with pure frequency spectrum through the LPF;
the radio frequency generation module consists of a crystal oscillator, a frequency mixer and a filter and is used for carrying out frequency conversion, filtering and amplification processing on the intermediate frequency signal to generate a radio frequency signal, and the generated radio frequency signal is sent to the antenna array feed channel unit;
the signal simulation unit has three signal channels, and provides three paths of signals for the antenna array triad respectively, and the programmable design architecture is adopted by the signal simulation unit, so that the intermediate frequency signal frequency synthesis has higher programmability, and the possibility of flexibly modulating the amplitude and the phase of the signal within a certain bandwidth is provided.
3. The system according to claim 1, wherein the antenna array feeder channel unit comprises a power amplifier and a switch matrix, and the first power amplifier is connected to the second power amplifier via the switch matrix; the power amplifier is used for compensating power loss in the signal transmission process; the switch matrix is composed of a plurality of radio frequency electronic switches and used for switching signal transmission paths so that signals are radiated from the specified radiation units of the antenna array.
4. The system for improving the simulation precision of the radio frequency semi-physical simulation broadband signal angle according to claim 1, wherein the measuring unit comprises a receiving antenna and a vector network analyzer, the vector network analyzer receives a reference signal and a radio frequency signal radiated by an antenna array, measures the amplitude and the phase of the signal in the bandwidth, so as to obtain the amplitude-frequency and phase-frequency characteristics of a triple transmission link, and performs data recording according to the measurement of the amplitude-frequency and the phase-frequency of the broadband signal; broadband signal amplitude-frequency and phase-frequency measurement data:
number 1, center frequency (GHz) f0Amplitude (dBm) E0Phase (°) phi0；
Number 2, center frequency (GHz) f0+ Δ f, amplitude (dBm) E1Phase (°) phi2；
Number 3, center frequency (GHz) f0+2 Δ f, amplitude (dBm) E2Phase (°) phi2；
……………………………………………………………
Number n, center frequency (GHz) fnAmplitude (dBm) EnPhase (°) phin；
f0For the starting frequency, f, of the broadband signalnFor the termination frequency of the wideband signal, the bandwidth B ═ fn–f0Amplitude and phase measurements are taken in steps of Δ f over the bandwidth (Δ f taken to be 50 MHz).
5. The system for improving the simulation precision of the radio frequency semi-physical simulation broadband signal angle according to claim 1, wherein the signal simulation unit, the antenna array feed channel unit and the measurement unit are provided with connection interfaces, including an inter-unit interface and an intra-unit interface;
interface between the units:
(1) the interface between the signal simulation unit and the antenna array feed channel unit adopts a standard SMA interface;
(2) the interface between the measuring unit and the signal simulation unit adopts a standard SMA interface;
unit internal interface:
(1) the signal resolving module and the intermediate frequency generating module adopt a standard PCIe interface, and the intermediate frequency generating module and the radio frequency generating module adopt a standard SMA interface;
(2) and standard SMA interfaces are adopted among the radio frequency devices such as power amplifiers, electronic switches and the like in the antenna array feed channel unit.
6. The method for improving the simulation accuracy of the radio frequency semi-physical simulation broadband signal angle according to claim 1, specifically comprising the following implementation steps of calibrating the system:
(1) the measurement unit is used for measuring the amplitude-frequency characteristic and the phase-frequency characteristic of each radio frequency channel of the antenna array feed channel unit, the bandwidth range is selected according to the actual use requirement,
carrying out data recording according to the measurement of the amplitude frequency and the phase frequency of the broadband signal;
broadband signal amplitude-frequency and phase-frequency measurement data:
number 1, center frequency (GHz) f0Amplitude (dBm) E0Phase (°) phi0；
Number 2, center frequency (GHz) f0+ Δ f, amplitude (dBm) E1Phase (°) phi2；
Number 3, center frequency (GHz) f0+2 Δ f, amplitude (dBm) E2Phase (°) phi2；
……………………………………………………………
Number n, center frequency (GHz) fnAmplitude (dBm) EnPhase (°) phin；
f0For the starting frequency, f, of the broadband signalnFor the termination frequency of the wideband signal, the bandwidth B ═ fn–f0Amplitude and phase measurements are taken in steps of Δ f over the bandwidth (Δ f is taken to be 50 MHz);
(2) taking the minimum value of the amplitude of each frequency point as the reference amplitude EstdTaking 10 degrees as a reference phase phistdCalculating the amplitude and phase calibration value of each frequency point according to the following formula, and carrying out data recording according to the amplitude frequency and phase frequency calibration of the broadband signal;
ΔE0＝E0-Estd
ΔΦ0＝Φ0-Φstd
the amplitude-frequency and phase-frequency calibration relation of the broadband signal is as follows:
number 1 center frequency (GHz) f0Amplitude calibration value (dB) Δ E0Phase calibration value (°) Δ Φ0；
Number 2 center frequency (GHz) f0+ Δ f, amplitude calibration value (dB) Δ E1Phase calibration value (°) Δ Φ2；
Sequence 3 center frequency (GHz) f0+2 Δ f, amplitude calibration value (dB) Δ E2Phase calibration value (°) Δ Φ2；
………………………………………………………………………………………
N-order center frequency (GHz) fnAmplitude calibration value (dB) Δ EnPhase calibration value (°) Δ Φn；
(3) An amplitude-phase calibration table is manufactured according to data of the amplitude-frequency and phase-frequency calibration relation of the broadband signal and loaded into a high-speed data memory of a signal simulation unit, and when the broadband signal is generated through simulation, the signal simulation unit carries out pre-distortion modulation on the amplitude and the phase of each frequency point in a signal bandwidth according to the amplitude-phase calibration data;
(4) the signal simulation unit sends the modulated broadband signal to the antenna array feed channel unit, and after the signal passes through the complete feed link, the broadband signal with improved amplitude-frequency characteristics and phase-frequency characteristics is obtained at the triple radiation unit, so that the angular simulation precision of the broadband signal is improved.
Priority Applications (1)
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| CN112152730A (en) * | 2020-08-26 | 2020-12-29 | 南京长峰航天电子科技有限公司 | Three-channel-based body target implementation system and method |
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| CN114844515A (en) * | 2022-03-25 | 2022-08-02 | 中国电子科技集团公司第二十九研究所 | Device and method for improving high-power output signal frequency spectrum quality of broadband electronic equipment |
| CN114844515B (en) * | 2022-03-25 | 2023-08-29 | 中国电子科技集团公司第二十九研究所 | Device and method for improving high-power output signal spectrum quality of broadband electronic equipment |
| CN117452442A (en) * | 2023-12-21 | 2024-01-26 | 中国人民解放军国防科技大学 | High-precision satellite navigation anti-interference method based on space-frequency self-adaptive processing |
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