CN113608183A - Hypersonic broadband radio frequency target simulation system - Google Patents
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- CN113608183A CN113608183A CN202110884941.6A CN202110884941A CN113608183A CN 113608183 A CN113608183 A CN 113608183A CN 202110884941 A CN202110884941 A CN 202110884941A CN 113608183 A CN113608183 A CN 113608183A
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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
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Abstract
The invention discloses a hypersonic broadband radio frequency target simulation system, which comprises: the device comprises a radar signal receiving frequency conversion module, a target time delay digital frequency storage module, a Doppler signal generation module, an instantaneous frequency measurement module, a signal amplitude and broadband power amplification module, a broadband local oscillator module and a control module. By adopting the technical scheme of the invention, the hypersonic radio frequency simulation target can be generated by accurately controlling the distance change, Doppler frequency shift and amplitude change characteristics of the radio frequency simulation target, so that the hypersonic radio frequency simulation target is consistent with a real hypersonic moving target.
Description
Technical Field
The invention belongs to the technical field of radar target simulation, particularly relates to a hypersonic-speed broadband radio-frequency target simulation system, particularly relates to a ship-borne radar hypersonic-speed broadband radio-frequency target simulation generation device, and can solve the problem that a ship-borne radar lacks hypersonic-speed target matching in training.
Background
At present, with the development of hypersonic weapons, the military strong countries such as the United states and Russia successively publish the development plans of hypersonic missiles and hypersonic unmanned aerial vehicles, and the target flight speed can reach more than 6 Mach. The high-overspeed movement of the target can cause the change of the radial distance change rate of the target to have higher power, so that the radar is difficult to record and track the target, and the defense difficulty is very high. Many radar target simulation devices are currently being developed. The functions of the devices are mainly to generate a conventional target signal through simulation, mainly aiming at the simulation of a conventional common motion speed target, and no method and device for specially generating a hypersonic speed target signal exist.
Disclosure of Invention
The invention aims to provide a hypersonic-speed broadband radio frequency target simulation system, which can provide a radio frequency simulation target with the maximum speed reaching 13 Mach for a radar and is used for detecting the detection performance and evaluating the efficiency of the radar on the hypersonic-speed target.
In order to achieve the purpose, the invention adopts the following technical scheme:
a hypersonic broadband radio frequency target simulation system comprises: the system comprises a radar signal receiving frequency conversion module, a target time delay digital frequency storage module, a Doppler signal generation module, an instantaneous frequency measurement module, a signal amplitude and broadband power amplification module, a broadband local oscillator module and a control module; wherein the content of the first and second substances,
after filtering and low-noise linear amplification are carried out on the received radar signals through a radar signal receiving and frequency converting module, mixing is carried out on the radar signals and local oscillation signals generated by a broadband local oscillation module to obtain intermediate frequency signals, the intermediate frequency signals are output to a target delay digital frequency storage module, and time delay values of targets are read in a control module to realize distance change simulation of hypersonic moving targets; then Doppler signal generation module adds Doppler frequency shift modulation information, and the Doppler frequency shift value is also read from control module, so as to realize velocity simulation of hypersonic radio frequency target; finally, the control module calculates the attenuation value under the current distance of the target in real time, and the accurate simulation of the amplitude of the target signal is realized through the signal amplitude and the broadband power amplifier module; the instantaneous frequency measurement module accurately measures the frequency of the radar signal in real time, and provides accurate tested radar radiation signal frequency for the target delay digital frequency storage module and the Doppler signal generation module through the control module, so that the simulation of the hypersonic radio frequency target signal is coherent with the tested radar signal.
Preferably, the radar signal receiving and frequency converting module is configured to receive a radiation signal of a radar, perform amplitude adjustment and low-noise amplification on the received radar radiation signal, mix the radar radiation signal with a local oscillator signal of the broadband local oscillator module to a frequency band required by digital frequency storage, and output the frequency band to the target delay digital frequency storage module.
Preferably, the target time-delay digital frequency storage module is used for carrying out distance delay on the target and simulating the occurrence distance of the moving target under different antenna scanning periods of the radar; according to the position of the simulated target, the control module calculates a time delay value of the simulated target echo signal relative to the emission pulse of the tested radar; under the synchronization of the detected radar emission signal detection pulse, the control module reads corresponding intermediate frequency pulse signals stored in the digital radio frequency memory according to the time delay value and simulates target echoes corresponding to different distances.
Preferably, the doppler signal generating module is configured to perform doppler modulation on the target echo information; the control module calculates the required Doppler signal frequency according to the target speed and the tested radar signal carrier frequency, and controls the direct digital frequency synthesizer to generate two orthogonal Doppler signals; the intermediate frequency digital signal output by the target time delay digital frequency storage module and subjected to distance modulation forms an orthogonal signal through an I/Q orthogonal extractor; and carrying out orthogonal frequency mixing on the I/Q two paths of intermediate frequency digital signals and orthogonal two paths of Doppler signals generated by a direct digital frequency synthesizer, and finally outputting the echo intermediate frequency signals which are modulated by Doppler frequency.
Preferably, the instantaneous frequency measurement module is used for accurately measuring the signal frequency output by the radar signal receiving and frequency conversion module; the control module calculates the current tested radar radiation signal frequency according to the frequency of the broadband local oscillation module and the output of the instantaneous frequency measurement module so as to calculate the Doppler frequency of the simulation target.
Preferably, the signal amplitude and broadband power amplification module is used for modulating the amplitude of a target signal, restoring a simulated target intermediate frequency signal output by distance delay and Doppler modulation to the original signal frequency of the tested radar, amplifying the simulated target signal to a required power level, transmitting the amplified simulated target signal to generate a hypersonic radio frequency target signal, and receiving the hypersonic radio frequency target signal by the radar; and the control module calculates the attenuation value of the target at the current distance in real time according to the initial distance and the initial attenuation of the simulated target, controls the programmable attenuator and realizes the accurate simulation of the target signal amplitude.
Preferably, the broadband local oscillator module is configured to generate, according to an operating frequency of the radar signal under test, a mixing local oscillator signal required by the receive down-conversion circuit and the transmit up-conversion circuit.
Preferably, the control module generates a current time delay value of the simulation target in real time according to the tested radar and the simulation target parameter and transmits the current time delay value to the target time delay digital frequency storage module to realize the distance modulation of the simulation target; calculating the frequency of the tested radar signal according to the frequency of the broadband local oscillation module and the output of the instantaneous frequency measurement module, generating Doppler frequency shift of a simulation target in real time and transmitting the Doppler frequency shift to a Doppler signal generation module, and realizing Doppler modulation on the simulation target signal; the control parameters for generating signal amplitude modulation are transmitted to a signal amplitude and broadband power amplification module, so that the accurate simulation of the target signal amplitude is realized; and the corresponding module is controlled in real time.
Preferably, the signal amplitude and broadband power amplifier module modulates the target signal amplitude by the high-speed radio frequency program-controlled attenuator.
Preferably, the doppler modulation is controlled by the signal processing circuit, and the doppler frequency modulation signal output by the signal processing circuit is up-converted to 1.5GHz central frequency as the signal amplitude and local oscillation signal of the broadband power amplification module.
The hypersonic radio frequency simulation target signal generated by the invention has obvious characteristics and is easy to be received and measured by a radar; a broadband system design is adopted, and the frequency coverage range of 2-18GHz is achieved; the target with the maximum relative radial velocity reaching mach 13 can be simulated and generated, and the method can be used for detecting the detection performance and evaluating the efficiency of the radar on the hypersonic target.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a hypersonic target radio frequency simulation system according to the present invention;
FIG. 2 is a schematic diagram of simulated target delay;
FIG. 3 is a diagram illustrating an implementation of digital Doppler modulation techniques;
fig. 4 is a diagram illustrating doppler shift synthesis.
Detailed Description
The present invention will be described in detail with reference to the following embodiments, wherein like or similar elements are designated by like reference numerals throughout the several views, and wherein the shape, thickness or height of the various elements may be expanded or reduced in practice. The examples are given solely for the purpose of illustration and are not intended to limit the scope of the invention. Any obvious modifications or variations can be made to the present invention without departing from the spirit or scope of the present invention.
As shown in fig. 1, the present invention provides a hypersonic broadband radio frequency target simulation system, which includes: the device comprises a radar signal receiving frequency conversion module, a target time delay digital frequency storage module, a Doppler signal generation module, an instantaneous frequency measurement module, a signal amplitude and broadband power amplification module, a broadband local oscillator module and a control module. The method can accurately control the distance change, Doppler frequency shift and amplitude change characteristics of the radio frequency simulation target to generate the hypersonic radio frequency simulation target, and the hypersonic radio frequency simulation target is consistent with a real hypersonic moving target. The implementation functions of each module are as follows:
and the radar signal receiving frequency conversion module is used for receiving the radiation signal of the radar, carrying out amplitude adjustment and low-noise amplification on the received radar radiation signal, mixing the radar radiation signal with the local oscillator signal of the broadband local oscillator module to a frequency band required by digital frequency storage, and outputting the frequency band to the target time-delay digital frequency storage module.
And the target time delay digital frequency storage module is used for carrying out distance delay on the target, and the time delay aims at simulating the occurrence distance of the moving target under different antenna scanning periods of the radar. And the control module calculates the next appearance distance of the simulated target according to the movement speed and the time difference of the target and converts the next appearance distance into delay time. In the system of the present invention, the range of the simulated rf target echo on the radar screen must be strictly controlled to allow acquisition and tracking by the radar. For this reason, it is necessary to perform high-precision distance delay on the distance of the simulation target. In order to realize the time delay (distance) simulation of the analog echo signal of the broadband frequency agile radar, a broadband digital frequency storage circuit is adopted for realizing the time delay (distance) simulation. According to the position of the simulated target, the control module calculates a time delay value of the simulated target echo signal relative to the emission pulse of the tested radar; under the synchronization of the detected radar emission signal detection pulse, the control module reads the corresponding intermediate frequency pulse signal stored in the digital radio frequency memory according to the time delay value, and accurately simulates target echoes corresponding to different distances (time delay values), as shown in fig. 2.
And the Doppler signal generating module is used for carrying out Doppler modulation on the target echo information. The Doppler signal generation module utilizes a digital algorithm to realize frequency modulation of radar signals, and replaces the traditional microwave devices such as a mixer, a filter and the like to realize frequency modulation of analog signals. The specific implementation method is shown in fig. 3: the control module calculates the required Doppler signal frequency according to the target speed and the tested radar signal carrier frequency, and controls the direct digital frequency synthesizer to generate two orthogonal Doppler signals; the intermediate frequency digital signal output by the target time delay digital frequency storage module and subjected to distance modulation forms an orthogonal signal through an I/Q orthogonal extractor; and carrying out orthogonal frequency mixing on the I/Q two paths of intermediate frequency digital signals and orthogonal two paths of Doppler signals generated by a direct digital frequency synthesizer, and finally outputting the echo intermediate frequency signals which are modulated by Doppler frequency.
The accuracy of the simulation of the doppler frequency depends on the accuracy of the selection of the radar signal frequency. In order to realize the hypersonic target simulation of the frequency agile radar, the invention adds a transient frequency measurement module to accurately measure the signal frequency output by the radar signal receiving and frequency conversion module. The control module calculates the current radiation signal frequency of the tested radar according to the frequency of the broadband local oscillation module and the output of the instantaneous frequency measurement module, and accordingly the Doppler frequency of the simulation target can be accurately calculated.
And the instantaneous frequency measurement module is used for accurately measuring an output signal (intermediate frequency signal) of the radar signal receiving and frequency conversion module, accurately measuring frequency and phase information of the signal and transmitting the information to the control module.
The signal amplitude and broadband power amplification module is used for modulating the amplitude of a target signal by a broadband high-speed radio frequency programmable attenuator with a large dynamic range, restoring a simulated target intermediate frequency signal output by distance delay and Doppler modulation to the original signal frequency of a tested radar, amplifying the simulated target signal to a required power level, transmitting the amplified simulated target signal, generating a hypersonic radio frequency target signal, and receiving the hypersonic radio frequency target signal by the radar. And the control module calculates the attenuation value of the target at the current distance in real time according to the initial distance and the initial attenuation of the simulated target, controls the programmable attenuator and realizes the accurate simulation of the target signal amplitude.
And the broadband local oscillator module is used for generating a mixing local oscillator signal required by the receiving down-conversion circuit and the transmitting up-conversion circuit according to the working frequency of the tested radar signal.
The control module is used for generating a current time delay value of a simulation target in real time according to the tested radar and the simulation target parameter and transmitting the current time delay value to the target time delay digital frequency storage module so as to realize the distance modulation of the simulation target; calculating the frequency of the tested radar signal according to the frequency of the broadband local oscillation module and the output of the instantaneous frequency measurement module, generating Doppler frequency shift of a simulation target in real time and transmitting the Doppler frequency shift to a Doppler signal generation module, and realizing Doppler modulation on the simulation target signal; the control parameters for generating signal amplitude modulation are transmitted to a signal amplitude and broadband power amplification module, so that the accurate simulation of the target signal amplitude is realized; and the corresponding module is controlled in real time.
According to the hypersonic-speed broadband radio-frequency target simulation system, after a radar signal receiving and frequency converting module is used for filtering and low-noise linear amplification of a received radar signal, the received radar signal is mixed with a local oscillator signal generated by a broadband local oscillator module to obtain an intermediate-frequency signal, the intermediate-frequency signal is output to a target delay digital frequency storage module, and a time delay value of a target is read in a control module, so that distance change simulation of a hypersonic-speed moving target is realized; then Doppler signal generation module adds Doppler frequency shift modulation information, and the Doppler frequency shift value is also read from control module, so as to realize velocity simulation of hypersonic radio frequency target; finally, the control module calculates the attenuation value under the current distance of the target in real time, and the accurate simulation of the amplitude of the target signal is realized through the signal amplitude and the broadband power amplifier module; the instantaneous frequency measurement module accurately measures the frequency of the radar signal in real time, and provides accurate tested radar radiation signal frequency for the target delay digital frequency storage module and the Doppler signal generation module through the control module, so that the simulation of the hypersonic radio frequency target signal is coherent with the tested radar signal.
The key point of the method for simulating and generating the hypersonic radio frequency simulation target signal lies in accurately controlling three aspects of delay distance change, Doppler frequency shift quantity and signal amplitude change characteristic of the radio frequency simulation target signal. The purpose of the change of the delay distance is to simulate the change of the displacement of a moving target, the purpose of adding Doppler frequency shift (the change of phase and frequency) into a simulated radio frequency signal is to simulate the Doppler effect of a real high-speed moving target, and the purpose of the change of the amplitude of the signal is to simulate the change of the energy of the signal received by a radar when the target is at different distances.
(1) Target distance simulation
In the system of the invention, the range of the simulated radar echo on the radar screen must be strictly controlled to provide truth data for the radar. For this reason, a high-precision distance delay must be performed for the distance of the target, and the delay of the distance may be equivalent to a delay of time in the present system. The realization method comprises the following steps: the radar signal receiving and frequency converting module aims to output an intermediate frequency signal (which is an analog signal), and the purpose of reducing the frequency-mixed radar signal to be tested into the intermediate frequency signal is to facilitate subsequent processing. The target time-delay digital frequency storage module performs digital sampling on the intermediate frequency signal and then converts the intermediate frequency signal into a digital signal (the purpose of converting the digital signal into the digital signal is to accurately control the time delay time), after the analog signal is converted into the digital signal, the digital signal is sent into a time delay circuit to perform envelope extraction on the radar pulse signal, a rising edge signal is used as a detection pulse reference pulse, and under the synchronization of the detection pulse of the emission signal of the tested radar, the target time-delay digital frequency storage module reads the intermediate frequency emission pulse stored in the digital radio frequency memory according to the time delay value tau n of the analog target calculated by the control module, and accurately simulates target echoes corresponding to different time delay values. And the control module calculates the next appearance distance of the simulation target according to the movement speed and the time difference of the simulation target and converts the next appearance distance into the delay time tau n.
(2) Target doppler shift simulation
In addition to the distance delay of the target, the doppler modulation of the echo information of the target is also needed, and the doppler shift is added in real time at a high speed, so that the velocity simulation of the hypersonic velocity can be realized. The realization method comprises the following steps: the output signal of the target time delay digital frequency storage module is an intermediate frequency digital signal added with a time delay value (distance modulation), and a Doppler signal generation module firstly carries out I/Q orthogonal extraction on the intermediate frequency digital signal to form an I intermediate frequency digital signal and a Q intermediate frequency digital signal; as shown in fig. 3, the control module calculates the required doppler signal frequency according to the set simulated target speed and the tested radar signal carrier frequency, generates a frequency control word, and controls the direct digital frequency synthesizer to generate orthogonal I doppler signal and Q doppler signal; the Doppler signal generation module carries out orthogonal frequency mixing on the I intermediate frequency digital signal and the Q intermediate frequency digital signal, the I Doppler signal and the Q Doppler signal, and finally the output is the echo intermediate frequency signal after Doppler frequency modulation.
The Doppler modulation circuit is controlled by the signal processing circuit, and the Doppler frequency modulation signal output by the signal processing circuit is up-converted to 1.5GHz central frequency to be used as a local oscillation signal of the signal amplitude and broadband power amplification module. The range of Doppler shift is-0.5 MHz, corresponding to the moving target with the relative radial velocity reaching 13 Mach when the radar working frequency is 18GHz, and the schematic block diagram is shown in FIG. 4. In the two frequency conversion processes of the Doppler modulation circuit, a filter circuit design is added after the two frequency conversion processes, so that the stray is ensured to be less than-50 dBc.
(3) Target intensity simulation
In order to simulate the strength of the target echo signal, according to the technical parameters of the tested radar, the radar cross section of the simulated target, the distance from the target to the radar, the fluctuation characteristic of the target amplitude and other factors influencing the strength of the simulated radio frequency target signal, the pulse signal strength of the target echo is calculated, the attenuation value required by controlling the amplitude of the output signal is calculated according to the strength of the output signal of the radio frequency channel and the maximum effective radiation power of the system, and the attenuator in the radio frequency channel is controlled, so that the strength of the echo signal reaching the receiving antenna of the tested radar is equal to the calculated value. The radio frequency target signal simulation mode can realistically simulate coherent and non-coherent target echo signals of pulse compression, frequency agility and pulse Doppler radar.
The simulated target intermediate frequency signal output by the Doppler signal generation module is subjected to distance modulation and Doppler modulation, the signal amplitude and broadband power amplification module mixes the intermediate frequency signal with a local oscillator signal of the broadband local oscillator module to obtain the frequency which is the same as that of a tested radar signal, and then the signal is subjected to power amplification and is transmitted out to generate a hypersonic radio frequency target signal which is received by a radar. The control module calculates the attenuation value of the target at the current distance in real time according to the initial distance and the initial attenuation of the simulated target, and controls the signal amplitude and the programmable attenuator of the broadband power amplification module to realize the accurate simulation of the target signal amplitude.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A hypersonic broadband radio frequency target simulation system is characterized by comprising: the system comprises a radar signal receiving frequency conversion module, a target time delay digital frequency storage module, a Doppler signal generation module, an instantaneous frequency measurement module, a signal amplitude and broadband power amplification module, a broadband local oscillator module and a control module; wherein the content of the first and second substances,
after filtering and low-noise linear amplification are carried out on the received radar signals through a radar signal receiving and frequency converting module, mixing is carried out on the radar signals and local oscillation signals generated by a broadband local oscillation module to obtain intermediate frequency signals, the intermediate frequency signals are output to a target delay digital frequency storage module, and time delay values of targets are read in a control module to realize distance change simulation of hypersonic moving targets; then Doppler signal generation module adds Doppler frequency shift modulation information, and the Doppler frequency shift value is also read from control module, so as to realize velocity simulation of hypersonic radio frequency target; finally, the control module calculates the attenuation value under the current distance of the target in real time, and the accurate simulation of the amplitude of the target signal is realized through the signal amplitude and the broadband power amplifier module; the instantaneous frequency measurement module accurately measures the frequency of the radar signal in real time, and provides accurate tested radar radiation signal frequency for the target delay digital frequency storage module and the Doppler signal generation module through the control module, so that the simulation of the hypersonic radio frequency target signal is coherent with the tested radar signal.
2. The hypersonic broadband radio frequency target simulation system of claim 1, wherein the radar signal receiving and frequency converting module is used for receiving radiation signals of a radar, performing amplitude adjustment and low noise amplification on the received radar radiation signals, mixing the radar radiation signals with local oscillation signals of the broadband local oscillation module to a frequency band required by digital frequency storage, and outputting the frequency band to the target delay digital frequency storage module.
3. The hypersonic broadband radio frequency target simulation system of claim 1, wherein the target delay digital frequency storage module is used for carrying out distance delay on the target and simulating the occurrence distance of the moving target under different antenna scanning periods of the radar; according to the position of the simulated target, the control module calculates a time delay value of the simulated target echo signal relative to the emission pulse of the tested radar; under the synchronization of the detected radar emission signal detection pulse, the control module reads corresponding intermediate frequency pulse signals stored in the digital radio frequency memory according to the time delay value and simulates target echoes corresponding to different distances.
4. The hypersonic broadband radio frequency target simulation system of claim 1, wherein the doppler signal generating module is used for doppler modulating target echo information; the control module calculates the required Doppler signal frequency according to the target speed and the tested radar signal carrier frequency, and controls the direct digital frequency synthesizer to generate two orthogonal Doppler signals; the intermediate frequency digital signal output by the target time delay digital frequency storage module and subjected to distance modulation forms an orthogonal signal through an I/Q orthogonal extractor; and carrying out orthogonal frequency mixing on the I/Q two paths of intermediate frequency digital signals and orthogonal two paths of Doppler signals generated by a direct digital frequency synthesizer, and finally outputting the echo intermediate frequency signals which are modulated by Doppler frequency.
5. The hypersonic broadband radio frequency target simulation system of claim 1, wherein the instantaneous frequency measurement module is used for accurately measuring the frequency of the signal output by the radar signal receiving and receiving frequency conversion module; the control module calculates the current tested radar radiation signal frequency according to the frequency of the broadband local oscillation module and the output of the instantaneous frequency measurement module so as to calculate the Doppler frequency of the simulation target.
6. The hypersonic-speed broadband radio-frequency target simulation system according to claim 1, wherein the signal amplitude and broadband power amplifier module is used for modulating the amplitude of a target signal, restoring a simulated target intermediate-frequency signal output by distance delay and Doppler modulation to the original signal frequency of a tested radar, amplifying the simulated target signal to a required power level, transmitting the amplified simulated target signal to generate a hypersonic-speed radio-frequency target signal, and receiving the hypersonic-speed radio-frequency target signal by the radar; and the control module calculates the attenuation value of the target at the current distance in real time according to the initial distance and the initial attenuation of the simulated target, controls the programmable attenuator and realizes the accurate simulation of the target signal amplitude.
7. The hypersonic broadband radio frequency target simulation system of claim 1, wherein the broadband local oscillator module is configured to generate the mixing local oscillator signals required by the receive down-conversion circuit and the transmit up-conversion circuit according to an operating frequency of the radar signal under test.
8. The hypersonic-speed broadband radio-frequency target simulation system as claimed in claim 1, wherein the control module is used for generating a current time delay value of a simulation target in real time according to the tested radar and the simulation target parameters and transmitting the current time delay value to the target time delay digital frequency storage module to realize the distance modulation of the simulation target; calculating the frequency of the tested radar signal according to the frequency of the broadband local oscillation module and the output of the instantaneous frequency measurement module, generating Doppler frequency shift of a simulation target in real time and transmitting the Doppler frequency shift to a Doppler signal generation module, and realizing Doppler modulation on the simulation target signal; the control parameters for generating signal amplitude modulation are transmitted to a signal amplitude and broadband power amplification module, so that the accurate simulation of the target signal amplitude is realized; and the corresponding module is controlled in real time.
9. The hypersonic broadband radio frequency target simulation system of claim 1, wherein the signal amplitude and broadband power amplifier module is implemented by a high-speed radio frequency programmable attenuator to modulate the amplitude of the target signal.
10. The hypersonic broadband radio frequency target simulation system of claim 3, wherein the Doppler modulation is controlled by the signal processing circuit, and the Doppler frequency modulation signal output by the signal processing circuit is up-converted to 1.5GHz center frequency as a local oscillation signal of the signal amplitude and broadband power amplification module.
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| CN116800357A (en) * | 2023-05-11 | 2023-09-22 | 北京扬铭科技发展有限责任公司 | Target movement attribute appraising device |
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