Broadband digital precise control system and implementation method

Abstract

The invention provides a broadband digital precise control system and an implementation method. The implementation method comprises the following steps: a down-conversion unit completes down-conversion processing and three-path power division on an input radio frequency target signal; the data transmission and interface unit completes interaction with internal and external information; the intermediate-frequency signal modulation unit performs acquisition, delay modulation, Doppler modulation, convolution modulation, high-precision amplitude-phase modulation, inter-channel compensation, digital-to-analog conversion and the like on the intermediate-frequency signals, and finally completes target signal echo modulation and amplitude-phase consistency modulation of the three paths of intermediate-frequency signals; the main control unit completes initial configuration, information interaction, data storage and flow control of the equipment; and the up-conversion unit completes up-conversion processing and power control on the three paths of intermediate frequency signals according to the power control word, and finally realizes accurate positioning of a target angular position in the triple. According to the invention, amplitude and phase modulation of three paths of intermediate frequency signals can be completed in a digital domain, and accurate positioning of a target angular position in a triple is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of digital signal modulation, in particular to a wideband digital precision control system and an implementation method. BACKGROUND

[0002] In order to cope with the increasingly complex modern battlefield electromagnetic environment, accurately identify high-value targets, and counter unmanned aerial vehicle swarm target attacks, various new system wideband radar systems are emerging. In order to test the performance of new system wideband radar systems, how to simulate complex scene echo signals, wideband high-resolution target signals in the field, and improve the signal simulation capability of instantaneous large bandwidth are current problems to be solved.

[0003] Currently, the radio frequency guidance semi-physical simulation system usually uses the principle of three-element combination to realize the in-field position simulation and motion of the target signal by controlling the amplitude and phase of the three channels through the precision control equipment. The current traditional precision control equipment mainly controls the amplitude and phase of each branch signal through digital attenuators and digital phase shifters, and has low integration and high complexity. In order to ensure the accuracy of target position simulation, the device needs to have high control accuracy, so imported devices are mostly used, and the equipment cost is high. In terms of frequency band coverage, the current device cannot simulate low frequency band (0.2GHz-2GHz) target signals, and the working frequency band of a single device cannot directly cover the mainstream working frequency band of 0.2GHz-40GHz, so multiple devices with different frequency bands need to be used together, further increasing the complexity and cost of the equipment. In terms of wideband signal simulation, since the digital attenuator and the digital phase shifter can only respond to the control word of one frequency point at the same time, it is difficult to simulate complex wideband signals.

[0004] Through the search of current patents, patent document CN112947119B (application number: 202110250020.4) discloses a radio frequency semi-physical simulation digital array implementation system and method. This patent optimizes the design of the composition structure of the feed channel, modulates the amplitude and phase of the signal in the digital domain, and simulates the position of the radio frequency target. However, this method can only simulate the spatial position of passive targets and cannot simulate the spatial position of active target echo signals, so it cannot effectively test the performance of active detection radars.

[0005] Patent document CN115575909A (application number: 202211053766.7) discloses a radio frequency array instantaneous bandwidth expansion method and system based on digital signal processing. This patent expands the instantaneous bandwidth of the system by adding an instantaneous bandwidth expansion module to the traditional radio frequency simulation system. However, this method is an optimization of the traditional radio frequency simulation system and still cannot solve the problems of narrow frequency band coverage and difficulty in simulating complex wideband signals of traditional precision control equipment. SUMMARY

[0006] Aiming at the defects in the prior art, the present application aims to provide a wideband digital fine control system and an implementation method.

[0007] The wideband digital fine control system implementation method provided by the present application comprises the following steps:

[0008] Step S1: receiving a radio frequency input signal through a radio frequency unit, down-converting the received radio frequency input signal to an intermediate frequency signal, and performing power adjustment on the intermediate frequency signal, and power dividing into three paths and respectively connecting to three intermediate frequency signal modulation units;

[0009] Step S2: after receiving the intermediate frequency signal through each intermediate frequency signal modulation unit, respectively performing AD acquisition, and converting the analog signal into a digital signal; performing time domain modulation and frequency domain modulation on the intermediate frequency digital signal in the digital domain to obtain the modulated intermediate frequency signal;

[0010] Step S3: converting the modulated intermediate frequency signal into an analog signal through the intermediate frequency signal modulation unit, and transmitting it to the radio frequency unit;

[0011] Step S4: performing up-conversion and power adjustment processing on the modulated intermediate frequency signal through the radio frequency unit, and outputting the processed radio frequency signal to a coarse control device to complete the spatial simulation of the target echo signal.

[0012] Preferably, the step S1 comprises: performing power adjustment on the intermediate frequency signal to 0dBm.

[0013] Preferably, the step S2 comprises: performing the processing including extraction filtering, time domain amplitude and phase modulation, frequency domain amplitude and phase modulation, interpolation filtering, and channel amplitude and phase compensation in the digital domain.

[0014] Preferably, the step S2 further comprises: performing wideband signal modulation including high-resolution target signal and SAR target signal according to requirements.

[0015] Preferably, the step S4 comprises: controlling the output power of the three signals according to the position information of the target, and finally transmitting to the corresponding three-element antenna on the antenna array surface through the coarse control device and radiating in space to realize the position simulation of the wideband target signal in space.

[0016] The wideband digital fine control system provided by the present application comprises:

[0017] The radio frequency unit is used for receiving a radio frequency input signal, down-converting the received radio frequency input signal to an intermediate frequency signal, and performing power adjustment on the intermediate frequency signal, and power dividing into three paths and respectively connecting to three intermediate frequency signal modulation units; at the same time, it is also used for performing up-conversion and power adjustment processing on the modulated intermediate frequency signal, and outputting the processed radio frequency signal to a coarse control device to complete the spatial simulation of the target echo signal.

[0018] Intermediate Frequency (IF) Signal Modulation Unit: After receiving the IF signal, it performs AD acquisition and converts the analog signal into a digital signal; it performs time-domain modulation and frequency-domain modulation on the IF digital signal in the digital domain to obtain the modulated IF signal; the modulated IF signal is then converted into an analog signal and transmitted to the radio frequency (RF) unit.

[0019] Preferably, the power adjustment of the intermediate frequency signal includes: adjusting the power of the intermediate frequency signal to 0dBm.

[0020] Preferably, the step of performing time-domain modulation and frequency-domain modulation on the intermediate frequency digital signal in the digital domain includes: performing decimation filtering, time-domain amplitude-phase modulation, frequency-domain amplitude-phase modulation, interpolation filtering, and channel amplitude-phase compensation processing on the intermediate frequency digital signal in the digital domain.

[0021] Preferably, the intermediate frequency signal modulation unit further includes: performing broadband signal modulation, including high-resolution target signals and SAR target signals, as required.

[0022] Preferably, the radio frequency unit includes: controlling the output power of three signals according to the target's position information, and finally transmitting them to the triplet antenna corresponding to the antenna array through a coarse control device and radiating the value space, thereby realizing the position simulation of the broadband target signal in space.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. This invention enables high-precision simulation of broadband targets by performing high-precision amplitude and phase modulation on three intermediate frequency signals in the digital domain; it can also perform target characteristic modulation such as delay, Doppler, and amplitude in the baseband, and has the ability to simulate complex broadband target signals such as high-resolution targets and SAR target signals; at the same time, it eliminates the numerically controlled phase shifter and numerically controlled attenuator in traditional precision control equipment, reducing construction costs and avoiding the risks caused by relying on imported components;

[0025] 2. All modulations in this invention are completed in the intermediate frequency digital domain, which avoids the shortcomings of traditional precision control equipment that can only accurately control one frequency point, and also has the function of radar echo simulation source.

[0026] 3. This invention upconverts the modulated intermediate frequency signal to the operating frequency point through the radio frequency unit. The operating frequency band can cover the current mainstream operating frequency band of 0.2GHz to 40GHz, and has the ability to be expanded to higher frequency bands.

[0027] 4、The application utilizes the principle of digital signal modulation, completes target modulation and amplitude and phase consistency modulation of three-way signals, realizes wideband target simulation, has radar target echo simulation and three-way signal amplitude and phase precision control ability, improves target simulation ability of the radio frequency guidance semi-physical simulation system, reduces construction and maintenance cost of the semi-physical simulation system, and avoids risks caused by dependence on imported devices. BRIEF DESCRIPTION OF DRAWINGS

[0028] Other features, objects, and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments, when read in conjunction with the accompanying drawings:

[0029] Figure 1 It is a wideband digital precision control device system composition schematic diagram.

[0030] Figure 2 It is a wideband digital precision control device working principle diagram.

[0031] Figure 3 It is a SAR target one-dimensional frequency domain echo calculation flow chart.

[0032] Figure 4 It is a frequency domain modulation schematic diagram.

[0033] Figures 5a to 5b It is a compensation amplitude and phase curve schematic diagram. DETAILED DESCRIPTION

[0034] The application will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the application, but do not limit the application in any form. It should be pointed out that, for those skilled in the art, without departing from the concept of the application, a number of changes and improvements can be made. These all belong to the protection scope of the application.

[0035] Example 1

[0036] The application provides a wideband digital fine control system, i.e. a wideband digital fine control device for high-precision amplitude and phase modulation of a radio frequency signal by digital modulation, which mainly comprises three intermediate frequency signal modulation units, one data transmission and interface unit, one main control unit and one radio frequency unit. Specifically, an external radio frequency input signal is directly transmitted to the radio frequency unit, subjected to down-conversion processing by the radio frequency unit, and subjected to power adjustment to 0dBm after being converted to an intermediate frequency. The signal is divided into three paths and connected to the three intermediate frequency signal modulation units. After receiving the intermediate frequency analog signal, each intermediate frequency signal modulation unit performs AD acquisition, converts the analog signal into a digital signal, and performs all modulation processes such as extraction filtering, time domain amplitude and phase modulation, frequency domain amplitude and phase modulation, interpolation filtering, channel amplitude and phase compensation on the intermediate frequency digital signal in the digital domain. Meanwhile, the modulation of complex wideband signals such as high-resolution target signals and SAR target signals can be performed according to requirements, and the modulated digital signal is output to a DA chip, converted into an analog signal, and then output to the radio frequency unit. Finally, the three intermediate frequency analog signals are subjected to up-conversion and power adjustment by the radio frequency unit, and the processed radio frequency signal is output to the corresponding A, B and C antenna links of the coarse control device through the cabinet interface, so as to realize the position simulation of the wideband target signal in space. The system composition block diagram is shown in Figure 1 .

[0037] Specifically, as shown in Figure 2 , the intermediate frequency signal modulation unit comprises an acquisition module, an output module and a modulation module.

[0038] The acquisition module is used for acquiring an analog signal and converting it into a digital signal.

[0039] The output module is responsible for converting a digital signal into an analog signal.

[0040] The modulation module performs all modulation processes such as extraction filtering, time domain amplitude and phase modulation, frequency domain amplitude and phase modulation, interpolation filtering and channel amplitude and phase compensation on the intermediate frequency digital signal. The convolution modulation method is also used to realize the simulation of high-resolution target signals and SAR target signals according to requirements.

[0041] The wideband digital fine control system further comprises a data transmission and interface unit, which is used for data transmission and interaction between boards, receives external synchronization triggers, frequency codes and other information, performs preprocessing such as deburring, and distributes the information to each intermediate frequency signal modulation unit.

[0042] The wideband digital fine control system further comprises a main control unit, which is responsible for the initialization configuration of the device and the control of the running process, interacts with an external main control device through a network, downloads compensation files, stores and manages the compensation files, interacts with an embedded device, and downloads initialization parameters and compensation files to the embedded hardware.

[0043] The radio frequency unit comprises one down-conversion unit, three up-conversion units, one clock unit and one local oscillator unit.

[0044] The local oscillator unit is configured to generate local oscillator signals required by the multiple up-down conversion units.

[0045] The down-conversion unit is configured to convert the input target signal to an intermediate frequency.

[0046] The up-conversion unit is configured to up-convert the intermediate frequency signal output by the intermediate frequency unit and output to three antenna links of the coarse control device.

[0047] The clock unit is configured to generate direct clocks with corresponding AD and DA sampling rates for the intermediate frequency signal modulation unit, so as to improve signal channel consistency and signal phase noise and other indicators, avoid clock differences generated by the on-board clock chip, and affect inter-board phase consistency.

[0048] According to the wideband digital precision control system implementation method, the following operations are performed by using the wideband digital precision control system, comprising:

[0049] Step 1: After the wideband digital precision control system is started, the main control unit starts to work, and initializes, configures, self-checks and controls the running process of each unit of the device.

[0050] Step 2: After the main control unit is initialized, the data transmission and interface unit receives external synchronization triggers, frequency codes and other information in real time through the reflection memory and other related data transmission board cards, and distributes the related information to the main control unit and each intermediate frequency signal modulation unit.

[0051] Step 3: The main control unit interacts with the external main control device through the network, downloads compensation files according to the received frequency point number, target position and other information, stores and manages the compensation files, and downloads the initialization parameters and compensation files to the embedded hardware of the intermediate frequency signal modulation unit.

[0052] Step 4: The radio frequency unit input port receives external radio frequency excitation signals.

[0053] Step 5: The clock unit generates direct clocks with corresponding AD and DA sampling rates for the intermediate frequency signal modulation unit.

[0054] Step 6: The down-conversion unit down-converts the external input radio frequency excitation signal to an intermediate frequency, adjusts the power of the converted intermediate frequency signal to 0dBm, and then divides the power into three paths and connects to three intermediate frequency signal modulation units.

[0055] Step 7: The acquisition frequency conversion modulation module in the intermediate frequency signal modulation unit performs AD sampling conversion on the received intermediate frequency analog signal into a digital intermediate frequency signal, and transmits to the FPGA module;

[0056] Step 8: The intermediate frequency signal modulation unit filters and extracts the digital intermediate frequency signal in the FPGA module, and extracts the basic information such as signal envelope and frequency of the filtered baseband signal to obtain the baseband excitation signal, and then performs delay modulation, Doppler modulation, convolution modulation, high-precision amplitude and phase modulation, wideband amplitude and phase modulation and other digital modulation on the baseband excitation signal in the time-frequency domain according to the instruction of the main control unit, and finally obtains the baseband data after amplitude and phase modulation is completed.

[0057] Step 9: The DSP module of the intermediate frequency signal modulation unit receives the frequency point number, target position, inter-channel amplitude and phase difference value and other information transmitted from the main control unit and the data interface unit, extracts and analyzes the amplitude and phase control parameters and frequency domain coefficients to obtain the corresponding waveform compensation coefficient, and transmits the related control word to the FPGA module.

[0058] Step 10: The FPGA module in the intermediate frequency signal modulation unit reads the related control word transmitted by the DSP module, and performs high-precision inter-channel pulse phase error compensation on the baseband data after amplitude and phase modulation according to the control word, and finally obtains three-way baseband excitation signals with consistent amplitude and phase.

[0059] Step 11: The three-way baseband excitation signals with consistent amplitude and phase are converted into intermediate frequency analog signals by the frequency conversion output module (DA), and are transmitted to three up-conversion units respectively.

[0060] Step 12: The external main control device calculates the power intensity of each channel of the triad according to the target position to be simulated, and transmits it to the main control unit, which controls the 3-way up-conversion unit to output three-way signals with corresponding power to the coarse control device. Finally, the signal is radiated to the space through the corresponding triad antenna, completing the spatial simulation of the target echo signal.

[0061] Embodiment 2

[0062] Embodiment 2 is a preferred example of Embodiment 1

[0063] According to the application, a kind of

[0064] Step 1: Develop external host computer main control software, which can calculate the relative position of the target according to the kinematic model, and calculate the triad power control value according to the triad control principle combined with the target position power information, and interact with the main control unit and interface unit of digital precision control equipment through optical fiber, network and the like;

[0065] Step two: design the acquisition module (AD) in the intermediate frequency signal modulation unit to have the ability of wideband intermediate frequency analog signal acquisition and conversion, and convert into digital signal;

[0066] Step three: design the output module (DA) in the intermediate frequency signal modulation unit to have the ability of wideband intermediate frequency digital signal conversion and transmission, which can convert the intermediate frequency wideband digital signal into intermediate frequency wideband analog signal and output to the next unit;

[0067] Step four: design the FPGA module in the intermediate frequency signal modulation unit to have the ability of intermediate frequency wideband digital signal modulation, which can receive the control word from the DSP module and perform high-precision amplitude and phase modulation on the digital signal according to the control word, can simulate high-resolution targets and SAR target echo signals, and can realize output of three intermediate frequency signals with the same amplitude and phase;

[0068] Step five: design the DSP module in the intermediate frequency signal modulation unit to have the ability of comprehensive information processing, which can receive information from the main control unit, calculate the phase, amplitude and scene information between channels according to the received information, and transmit the calculated control word to the FPGA module;

[0069] Step six: design the data transmission and interface unit to have the ability of data transmission and interaction between boards, which can transmit and interact with external boards, receive external synchronous trigger, frequency code and other information, and complete deburring preprocessing;

[0070] Step seven: design the main control unit to have the ability of scheduling and controlling the whole device process, which can initialize and configure the device and control the running process, interact with external main control devices through network, store and manage compensation files, and interact with the embedded device in the intermediate frequency modulation unit and download initialization parameters and compensation files to the embedded hardware;

[0071] Step eight: design the local oscillator unit to generate local oscillator signals required by the up-conversion and down-conversion units;

[0072] Step nine: design the down-conversion unit to convert the input target signal to intermediate frequency signal and have the power control function, which can obtain 0dBm intermediate frequency analog signal;

[0073] Step ten: design the up-conversion unit to convert the intermediate frequency signal output by the intermediate frequency signal modulation unit, which can receive three-element power control value and echo power control value, and control the echo power output by the three channels according to the control word;

[0074] Step eleven: design a clock unit for generating a direct clock corresponding to the AD and DA sampling rate for the intermediate frequency signal modulation unit;

[0075] Step twelve: use optical fiber and radio frequency cable to connect each module, input the radio frequency signal output by the three up-conversion units into the corresponding coarse control device, and finally transmit to the corresponding antenna, each antenna radiates signals simultaneously, simulating the echo signal of the target position in space.

[0076] Embodiment 3

[0077] Embodiment 3 is a preferred embodiment of embodiment 1

[0078] According to the wideband digital precision control system implementation method provided by the application, the method comprises the steps of:

[0079] Suppose that the SAR target echo with a bandwidth of 500MHz needs to be simulated in the radio frequency guidance semi-physical simulation system, since the amplitude and phase consistency of the traditional precision control device is realized by adjusting the control word of the digital attenuator and the digital phase shifter according to the corresponding frequency point, and the digital attenuator and the digital phase shifter can only respond to the control word of one frequency point at the same time, and cannot compensate for the phase distortion of the remaining frequency points in the band, and the signal cannot be positionally synthesized in space after being radiated by the triad antenna, therefore, the traditional radio frequency guidance semi-physical simulation system based on the digital attenuator and the digital phase shifter is difficult to simulate the wideband signal.

[0080] If the SAR target echo with a bandwidth of 500MHz needs to be simulated in the traditional radio frequency guidance semi-physical simulation system, a SAR target echo source and a set of radio frequency array instantaneous bandwidth expansion device need to be connected, the whole system is more complex, and the cost is higher.

[0081] In order to meet the ability of simulating the wideband target signal, the ADC device with a center frequency of 1.1GHz, an instantaneous bandwidth of 2GHz and a sampling rate of 6GHz is selected, the wideband signal with a bandwidth of 2GHz can be collected and simulated, and the low frequency band target signal below 2GHz can be directly sampled to the intermediate frequency signal modulation unit for processing, so that the simulation of the low frequency band target signal below 2GHz is realized; for the SAR target echo simulation with a bandwidth of 500MHz, the input radio frequency excitation signal is down-converted to an intermediate frequency (1.1GHz), the "Stop and go" model is used at the intermediate frequency, and the influence factors such as motion error, antenna modulation and spatial attenuation are added, the SAR target echo is regarded as being composed of a large number of point target echoes in the scene, and the SAR target echo signal model is:

[0082]

[0083] In the formula, L is the number of point targets in the scene, A kis the amplitude factor of the kth target echo, R k is the distance from the kth target to the antenna phase center; N represents the number of pulses, a represents a rectangular window function, t represents time, c represents a beam, λ represents the wavelength of the electromagnetic wave emitted by the radar, φ represents a delay phase function, n represents the nth pulse, T prt represents a pulse period;

[0084] To meet the requirement of simulation real-time, a one-dimensional frequency domain echo simulation algorithm is used to perform convolution calculation on the radar transmitted pulse s(t) and the target echo system function (impulse response sequence) h(t), and finally obtain the intermediate frequency SAR target echo signal s r (t).

[0085]

[0086] The calculation process of the one-dimensional frequency domain echo simulation algorithm is shown in Figure 3 .

[0087] After completing the intermediate frequency modulation of the SAR target echo, high-precision amplitude and phase modulation is performed on the intermediate frequency signal in the time domain and the frequency domain. In the time domain, high-precision amplitude and phase modulation is completed by performing complex multiplication processing on the digital signal; in the frequency domain, the wideband signal is directly modulated by establishing a FIR filter to correct the in-band flatness and phase error, as shown in Figure 4 .

[0088] After completing the high-precision amplitude and phase modulation in the channel, the inter-channel amplitude and phase compensation file is obtained through channel error extraction, system error calibration, etc. According to the frequency point information, scene information, etc. input by the data transmission interface unit and the main control unit, the corresponding amplitude and phase compensation file is read, and after digital amplitude and phase modulation, compensation for the consistency of the channel amplitude and phase is completed, and finally the three-channel intermediate frequency signals with consistent amplitude and phase are obtained; as shown in Figures 5a to 5b .

[0089] The final three-channel intermediate frequency signals are up-converted to the working frequency point and output to the A, B and C three-channel feeding links corresponding to the coarse control device, and are radiated to the space through the three-element antenna corresponding to the antenna array unit, to complete the in-field simulation of the SAR echo signal.

[0090] Those skilled in the art know that, in addition to implementing the system, device and each module thereof provided by the present application in the form of pure computer readable program code, the same program can also be implemented in the form of logic gate, switch, special integrated circuit, programmable logic controller and embedded microcontroller, etc. by logically programming the method steps. Therefore, the system, device and each module thereof provided by the present application can be considered as a hardware component, and the modules included therein for implementing various programs can also be considered as structures in the hardware component; the modules for implementing various functions can also be considered as both software programs for implementing methods and structures in the hardware component.

[0091] The specific embodiments of the present application are described above. It needs to be understood that the present application is not limited to the specific embodiments described above, and various changes or modifications can be made by those skilled in the art within the scope of the claims, which does not affect the essential content of the present application. The embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily without conflict.

Claims

1. A method for implementing a wideband digital precision control system, characterized in that, The method comprises the following steps: Step S1: receiving a radio frequency input signal through a radio frequency unit, down-converting the received radio frequency input signal to an intermediate frequency signal, and power regulating the intermediate frequency signal, and dividing the power into three paths and connecting the three paths to three intermediate frequency signal modulation units respectively; Step S2: after receiving the intermediate frequency signal through each intermediate frequency signal modulation unit, AD acquisition is performed respectively, and the analog signal is converted into a digital signal; the intermediate frequency digital signal is modulated in the time domain and the frequency domain in the digital domain to obtain a modulated intermediate frequency signal; Step S3: the modulated intermediate frequency signal is converted into an analog signal through the intermediate frequency signal modulation unit and transmitted to the radio frequency unit; Step S4: the modulated intermediate frequency signal is up-converted and power regulated through the radio frequency unit, and the processed radio frequency signal is output to a coarse control device to complete the spatial simulation of the target echo signal.

2. The wideband digital agile control system implementation method of claim 1, wherein, The step S1 comprises: power regulating the intermediate frequency signal to 0dBm.

3. The method of claim 1, wherein, The step S2 comprises: performing extraction filtering, time domain amplitude and phase modulation, frequency domain amplitude and phase modulation, interpolation filtering processing and channel amplitude and phase compensation processing on the intermediate frequency digital signal in the digital domain.

4. The method of claim 1, wherein, The step S2 further comprises: performing wideband signal modulation of high-resolution target signals and SAR target signals according to requirements.

5. The method of claim 1, wherein, The step S4 comprises: controlling the output power of the three signals according to the position information of the target, and finally transmitting the three signals to the corresponding three-element antenna on the antenna array surface through the coarse control device and radiating in space to realize the position simulation of the wideband target signal in space.

6. A wideband digital precision control system characterized by, The method comprises the following steps: A radio frequency unit is configured to receive a radio frequency input signal, down-convert the received radio frequency input signal to an intermediate frequency signal, and power regulate the intermediate frequency signal, divide the power into three paths, and connect the three paths to three intermediate frequency signal modulation units respectively; the radio frequency unit is also configured to up-convert and power regulate the modulated intermediate frequency signal, and output the processed radio frequency signal to a coarse control device to complete the spatial simulation of the target echo signal; An intermediate frequency signal modulation unit is configured to receive an intermediate frequency signal, perform AD acquisition respectively, and convert an analog signal into a digital signal; the intermediate frequency digital signal is modulated in the time domain and the frequency domain in the digital domain to obtain a modulated intermediate frequency signal; the modulated intermediate frequency signal is converted into an analog signal through the intermediate frequency signal modulation unit and transmitted to the radio frequency unit.

7. The wideband digital agile control system of claim 6, wherein, The power regulation of the intermediate frequency signal comprises: regulating the power of the intermediate frequency signal to 0dBm.

8. The wideband digital agile control system of claim 6, wherein, The time domain modulation and the frequency domain modulation of the intermediate frequency digital signal in the digital domain comprise: performing extraction filtering, time domain amplitude and phase modulation, frequency domain amplitude and phase modulation, interpolation filtering processing and channel amplitude and phase compensation processing on the intermediate frequency digital signal in the digital domain.

9. The wideband digital agile control system of claim 6, wherein, The intermediate frequency signal modulation unit further comprises: performing wideband signal modulation of high-resolution target signals and SAR target signals according to requirements.

10. The wideband digital agile control system of claim 6, wherein, The radio frequency unit comprises: controlling the output power of the three signals according to the position information of the target, and finally transmitting the three signals to the corresponding three-element antenna on the antenna array surface through the coarse control device and radiating in space to realize the position simulation of the wideband target signal in space.

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