A system and method for electromagnetic space perception and construction based on radio frequency forwarding

Abstract

The present invention relates to an electromagnetic space perception and construction method based on radio frequency forwarding, comprising the following steps: constructing a wireless transmission network, including a management center and multiple terminal devices; the management center deploys perception tasks and construction tasks to the terminal devices; the terminal devices performing the perception tasks detect in the first frequency band, and divide the signals emitted by the non-cooperative radiation source detected into a first target signal and a second target signal; the terminal devices performing the perception tasks convert the second target signal into amplified signals and send them through the second frequency band, and at the same time, perform preliminary analysis on the first target signal, and send specific data in the analysis results to the management center for centralized fusion processing; the terminal devices performing the electromagnetic space construction tasks obtain the second target signal and construct a virtual electromagnetic space. The present invention can continuously perceive the electromagnetic space and construct the virtual electromagnetic space in real time.

Description

Technical Field

[0001] The present invention relates to the technical field of communication perception integration, and in particular to an electromagnetic space perception and construction system and method based on radio frequency forwarding. Background Art

[0002] With the development of electronic information, mobile Internet and other technologies, the demand for the use of electromagnetic spectrum has exploded. Spectrum resources are open. On the one hand, based on a series of electronic information technologies, electromagnetic waves can realize the functions of transmitting information and sensing targets by utilizing this openness. On the other hand, electromagnetic waves can also be used to detect, construct radiated electromagnetic waves, or even forge electromagnetic waves, affecting the normal operation of electromagnetic systems, such as pseudo base stations, radars and radar jammers in urban areas. Therefore, it is of great significance to the extensive development and utilization of electromagnetic spectrum, and the premise of its development is to have a good perception of electromagnetic space and to be able to properly reconstruct the external electromagnetic space.

[0003] The essence of electromagnetic space perception and electromagnetic space construction is the detection and radiation of electromagnetic waves. When two functions are integrated into one device, two modes can be selected for time division multiplexing or full-duplex technology can be used to implement the two functional modules at the same time. If the two working modes are switched in time, the parallel of full system perception and space construction must be achieved through a distributed multi-node approach. If full-duplex technology is used, the problem of self-interference suppression must be solved on miniaturized mobile devices. From the perspective of engineering implementation, by deploying a distributed multi-node system and deploying different working modes for different nodes, the above functions can be realized more conveniently and with better mobility.

[0004] For nodes working in spectrum sensing mode, the entire frequency band is used for signal monitoring. Due to the limitation of local computing power, the sensing data generally needs to be transmitted back to the task management center (fusion center) for collaborative processing and storage. After obtaining all the situations at the task management center, the working mode or strategy of the distributed nodes is dynamically adjusted through the wireless communication link. This method is suitable for a relatively stable spectrum environment due to the long transmission loop. For situations with strong spectrum dynamics or electromagnetic construction, such as interference signals or other electromagnetic spectrum construction tasks with higher real-time requirements, the response ability of the entire system is affected due to the large delay. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an electromagnetic space perception and construction system and method based on radio frequency forwarding, which can continuously perceive the electromagnetic space and construct a dynamic virtual electromagnetic target group in real time.

[0006] The technical solution adopted by the present invention to solve its technical problem is: to provide an electromagnetic space perception and construction system based on radio frequency forwarding, including a management center and multiple terminal devices that communicate with each other, characterized in that the management center deploys perception tasks and construction tasks to the terminal devices, and collects data from the terminal devices that perform perception tasks for fusion perception, and the terminal devices include a first radio frequency module, a second radio frequency module, a reconnaissance and direction finding module, a signal processing module and a wireless communication module; when the terminal device performs the perception task, the first radio frequency module performs detection in the first frequency band, and divides the signal emitted by the non-cooperative radiation source received into a first target signal and a second target signal, after the reconnaissance and direction finding module performs information analysis on the first target signal, extracts specific data from the analysis result and sends it to the management center through the wireless communication module, and the second radio frequency module performs frequency conversion and amplification on the second target signal and then forwards it in the second frequency band; when the terminal device performs the construction task, the second radio frequency module detects the second target signal in the second frequency band, and the signal processing module generates multiple false target signals near the target position based on the received second target signal to form a virtual electromagnetic space.

[0007] Furthermore, the terminal device that performs the construction task obtains the fused perception data of the management center through the wireless communication module, reconstructs the digital domain RF signal of the second target signal based on the fused perception data through the signal processing module, coherently generates multiple false target signals, and sends the false target signal through the first RF module to form a virtual electromagnetic space.

[0008] Furthermore, the electromagnetic signal pattern of the virtual electromagnetic space is:

[0009]

[0010] Wherein, L is the number of the construction nodes, N is the number of false target signals generated by each construction node at time t, and A ij (t) is the amplitude of the jth false target signal generated by the i-th construction node, S(t) is the second target signal, R dif (t) is the adjustment distance difference, c is the propagation speed of electromagnetic waves in the air, ω ij is the Doppler frequency shift, τ ij To adjust the time delay, so as to adjust the distance between the false target signal and the target position.

[0011] The technical solution adopted by the present invention to solve the technical problem is: to provide an electromagnetic space perception and construction method based on radio frequency forwarding, comprising the following steps:

[0012] Constructing a wireless transmission network, wherein the wireless transmission network includes a management center and a plurality of terminal devices that communicate with each other;

[0013] The management center deploys the sensing task and the construction task to the terminal device, and the terminal device is divided into a sensing node and a construction node according to different deployment tasks;

[0014] The sensing node detects in the first frequency band, and divides the detected signal emitted by the non-cooperative radiation source into a first target signal and a second target signal;

[0015] The sensing node converts and amplifies the second target signal and sends it through a second frequency band, and analyzes the first target signal at the same time, and sends specific data in the analysis result to the management center;

[0016] The construction node acquires the second target signal and constructs a virtual electromagnetic space, wherein the virtual electromagnetic space includes a plurality of false target signals distributed near a target position.

[0017] Furthermore, the method also includes a step in which the management center performs fusion perception based on the received data to obtain the location information and receiving time slot of the non-cooperative radiation source.

[0018] Furthermore, the construction node constructs the virtual electromagnetic space by the following method:

[0019] Obtaining location information of the non-cooperative radiation source, target location, sensing node and construction node;

[0020] According to the location information of the non-cooperative radiation source, the target location, the construction node and the sensing node, the adjusted distance difference is calculated.

[0021]

[0022] Among them, R Tar is the distance from the target location to the non-cooperative radiation source, r1 is the distance from the non-cooperative radiation source to the sensing node, r2 is the distance from the sensing node to the construction node, and r3 is the distance from the construction node to the non-cooperative radiation source;

[0023] Based on the adjustment distance difference R dif The delay parameter of the digital domain radio frequency signal reconstruction of the second target signal is adjusted to generate a plurality of false target signals near the target position to form the virtual electromagnetic space.

[0024] Furthermore, the signal pattern of the virtual electromagnetic space is:

[0025]

[0026] Wherein, L is the number of the construction nodes, N is the number of false target signals generated by each construction node at time t, and A ij (t) is the amplitude of the jth false target signal generated by the i-th construction node, S(t) is the second target signal, R dif (t) is the adjustment distance difference, c is the propagation speed of electromagnetic waves in the air, ω ij is the Doppler frequency shift, τ ij To adjust the time delay, so as to adjust the distance between the false target signal and the target position.

[0027] Further, when the absolute value of the adjusted time delay is smaller than the receiving time slot of the non-cooperative radiation source, the virtual electromagnetic space forms interference coverage for the target location.

[0028] Furthermore, the location information of the target location and the construction node is acquired through a satellite navigation system or the management center.

[0029] Furthermore, when the location information of the target location cannot be obtained within the preset time, the distance R from the target location to the non-cooperative radiation source is predicted by the following method: Tar :

[0030] Based on historical data, calculate the location information update delay T of the target location delay and the moving speed V of the target position relative to the non-cooperative radiation source radar ;

[0031] According to the distance R between the target position and the non-cooperative radiation source at the last moment Tar_old , the distance between the target position and the non-cooperative radiation source at the current moment is calculated to be R Tar =R Tar_old +V radar ×T delay .

[0032] Furthermore, the sensing node divides the received signal into the first target signal and the second target signal through power allocation.

[0033] Furthermore, when the sensing node forwards the second target signal, it sends it in a directional or omnidirectional mode.

[0034] Beneficial Effects

[0035] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0036] (1) The present invention adopts a system structure of a management center and multiple terminal nodes. The nodes communicate in a self-organizing form, and tasks that need to be processed in real time are processed locally and shared, which shortens the data transmission and processing loop, reduces the delay of information sharing, increases the real-time performance of task processing, and thus improves the responsiveness of the entire system;

[0037] (2) The terminal node of the present invention adopts a radio frequency multi-channel and multi-functional integrated design, which can process the detection and transmission tasks of the signal in parallel, so that the system can continuously monitor the non-cooperative emission source while being able to communicate with other terminal nodes and the management center in real time, and has good mobility;

[0038] (3) The present invention deploys two different working modes, namely, sensing and constructing, for the terminal nodes. The sensing node responsible for detection continuously performs full-spectrum detection in its working frequency band, and at the same time, it converts and amplifies the detected signal and sends it to the construction node. The construction node generates a virtual electromagnetic space, thus avoiding the problem of self-interference suppression.

[0039] (4) The present invention calculates the adjusted distance difference based on the location information of the node, as well as the location information of the non-cooperative radiation source and the target location, and adjusts the delay parameter of the digital domain RF signal reconstruction of the second target signal based on the adjusted distance difference, so that a plurality of false target signals are generated near the target location to form a virtual electromagnetic space, and by adjusting the delay parameter, the false target signal and the echo signal of the target location can be injected into the same receiving time window of the non-cooperative radiation source, thereby forming interference coverage of the target location. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a system schematic diagram of a first embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of data flow between nodes in the first embodiment of the present invention;

[0042] Figure 3 is a structural diagram of a terminal device in a first embodiment of the present invention;

[0043] Figure 4 is a schematic diagram of a flow chart of a second embodiment of the present invention;

[0044] Figure 5 is a schematic diagram of the positions of the nodes in the second embodiment of the present invention;

[0045] Figure 6 It is a scene schematic diagram of a specific example in the second embodiment of the present invention. DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0047] The first embodiment of the present invention relates to an electromagnetic space sensing and construction system based on radio frequency forwarding, such as Figure 1 As shown in the figure, it consists of a task management center and M distributed wireless sensor terminals. The sensor terminals can be mounted on mobile platforms such as drones and vehicles. The task management center is connected to the base station through optical fiber, and broadband interconnection and information exchange are carried out with the distributed wireless sensor terminals through the base station; the task management center has data processing functions, which can store the sensor information and other control information sent back by the sensor terminal, and perform data fusion and processing; the task management center is the human-computer interaction interface of the system, and the staff can observe the visual data through the visual interface and perform real-time command control on the sensor terminal, such as movement trajectory, working hours and strategies.

[0048] The wireless sensor terminal adopts RF multi-channel and multi-functional integrated design, with the functions of radio signal detection and radiation, self-organizing communication between terminals, data processing of intermediate frequency data signals, storage of small batch data, etc. The terminal function panel is as follows: Figure 3 As shown, it includes a radio frequency processing module, a frequency conversion module, a data storage module, a reconnaissance and direction finding module, a signal processing module and a wireless communication module. Other necessary functions of the device (such as main control, clock exchange, power supply control, etc.) are not related to the present invention and are not marked in the figure.

[0049] In this implementation, the task management center deploys work for the above-mentioned wireless terminals, divides the terminal devices into perception nodes and construction nodes according to different tasks, and collects relevant data from the terminal nodes for fusion perception to obtain the location information and receiving time slots of non-cooperative radiation sources.

[0050] like Figure 2 As shown, the sensing node detects in the first frequency band through the radio frequency processing module, and divides the signal emitted by the non-cooperative radiation source into a first target signal and a second target signal. After the reconnaissance and direction finding module performs information analysis on the first target signal, the analysis result is stored in the data storage unit, and specific data in the analysis result is extracted and sent to the task management center through the wireless communication module. The frequency conversion module converts the frequency of the second target signal and amplifies it and then forwards it in the second frequency band.

[0051] The construction node detects the second target signal in the second frequency band through the frequency conversion module, obtains relevant information data of the non-cooperative radiation source from the task management center through the wireless communication module, and the signal processing module configures the parameters of the digital domain radio frequency signal reconstruction of the second target signal based on the received data, coherently generates multiple false target signals, and sends the generated false target signals through the radio frequency processing module to form a virtual electromagnetic space.

[0052] The second embodiment of the present invention relates to an electromagnetic space sensing and construction method based on radio frequency forwarding, such as Figure 4 As shown, including:

[0053] A1. Build a wireless transmission network, including a management center and multiple terminal devices that communicate with each other;

[0054] A2. The management center deploys the perception tasks and construction tasks to the terminal devices, and divides the terminal devices into perception nodes and construction nodes according to different execution tasks;

[0055] A3. The sensing node performs full-spectrum detection in its working frequency band, and splits the signal power of a specific frequency band emitted by a non-cooperative radiation source into two paths. The second target signal is converted and amplified to other frequency bands for directional or omnidirectional transmission through a frequency converter, and the first target signal is processed locally through a data processing module.

[0056] A4. The sensing node analyzes the first target signal on its own and stores it locally, while transmitting specific parameters back to the management center through the communication link. After the mission is completed, the information stored on the local machine can be loaded into the ground system for offline analysis;

[0057] A4. The management center performs fusion perception based on the received data and generates strategy information based on the results of fusion perception, including the location information and receiving time slot of the non-cooperative radiation source;

[0058] A5. After the construction node obtains the second target signal and strategy information, it performs corresponding signal processing locally and modulates a coherent false target signal in the working frequency band of the non-cooperative radiation source. The generated false target signal forms a virtual electromagnetic space with the target position as the center.

[0059] After completing the relay transformation of the terminal wireless sensor equipment through the above method, each terminal node in the network shares sensor information through a wireless self-organizing network, achieving sensor information sharing with lower latency without affecting device perception, electromagnetic signal transmission and communication control.

[0060] Next, the construction method of the virtual electromagnetic space in this embodiment is specifically described. The ground management center can obtain the location information and receiving time slot of the non-cooperative radiation source through fusion perception. Therefore, the node in the working construction mode can construct a virtual electromagnetic space for a specific non-cooperative radiation source, thereby achieving the effect of constructing a virtual electromagnetic space in a specific target or area.

[0061] according to Figure 5 The position of each node is shown in , and the construction method of the virtual electromagnetic space is as follows:

[0062] B1. Construct node initialization to store the local location information and radiation source location information. The local location information is obtained through satellite navigation systems such as GPS, or through the management center. The management center can obtain the location information of non-cooperative radiation sources through related methods of distributed active positioning, or obtain the location information of non-cooperative radiation sources through other systems directly providing intelligence;

[0063] B2. The location information of the target location A can be obtained from satellite navigation information or from the management center. A can be mobile or fixed;

[0064] B3. Set the prediction timer and update cycle T of position A. When the location information of node A is successfully obtained within the set time of the prediction timer, check whether the prediction timer is turned on. If it is already started, turn off the old prediction timer and start a new prediction timer. Otherwise, continuously predict the current information based on the previous information of node A, execute the coordinate conversion algorithm, and calculate the adjusted distance difference.

[0065] The coordinate transformation algorithm is as follows:

[0066] By predicting the historical data of the timer, the target location information update delay T can be calculated. delay ;

[0067] Through the historical data of each node position, the moving speed V of the target position relative to the non-cooperative radiation source can be fitted. radar ;

[0068] According to the distance R between the target position and the non-cooperative radiation source at the last moment Tar_old , the distance between the current target position and the non-cooperative radiation source is calculated to be R Tar =R Tar_old +V radar ×T delay .

[0069] The distance difference is calculated as follows:

[0070] From the non-cooperative radiation source to the sensing node to the construction node (ignoring the node processing delay), the total air interface time delay is If it is necessary to form an electromagnetic false target group at a distance R from the radiation source, the overall time delay needs to be adjusted to Therefore, the adjustment distance difference can be deduced

[0071] B4. Configure the parameters of the digital domain RF signal reconstruction of the second target signal according to the adjusted distance difference, so that the generated false target signal covers the area around node A. The construction style is expressed as follows:

[0072]

[0073] in,

[0074] L represents the number of nodes, which can be a single node or multiple nodes;

[0075] N represents the number of false target signals generated by a single node at a certain moment, which is related to the equivalent radiation power of the node. The greater the equivalent radiation power, the more false target signals with the same power can be generated by power division.

[0076] S(t) is the frequency conversion signal received by the node, which is stored locally after the node receives it;

[0077] A ij (t) is the amplitude of the jth false target signal generated by the ith node. The amplitude is related to the interference cross-sectional area and distance of the non-cooperative radiation source, and is also related to the fluctuations caused by the power amplifier efficiency, interference waveform mismatch, multi-target superposition loss, and antenna pointing error.

[0078] ω ij For the additional Doppler frequency shift, a random offset is added to the frequency deviation caused by the velocity of node A after considering the frequency measurement error, motion jitter compensation, etc.;

[0079] τ ij To adjust the delay, it can be positive or negative. By adjusting this parameter, multiple false target signals that arrive successively can be formed within a time window, thereby simulating the distance between the false target signal and the target position.

[0080] R(t) is the adjustment distance difference;

[0081] c is the propagation speed of electromagnetic waves in air.

[0082] By adjusting τ ij , the virtual electromagnetic space can be superimposed around the target position, ensuring that the false target signal and the echo of the target position are injected in the same time window, forming interference coverage of the target position.

[0083] Take a typical target shielding scenario for radar as an example. In this scenario, the center of the false target area A is a specific shielding target, and A is moving. When there is no specific shielding target in the area, a false target group in a specific area can also be generated according to the radar's receiving time window. Figure 6 As shown in the figure, assuming that a radar works in the L1 frequency band, three integrated sensing terminals are deployed in its detection area to monitor and interfere with its working mode respectively. For example, terminal #1 works in spectrum sensing mode and conducts full-spectrum reconnaissance and collection of radar pulse signals. Terminals #2 and #3 both work in interference state. Set the high-speed frequency conversion information sharing to the L2 frequency band, and use the UHF frequency band for communication backhaul. Before the task is executed, each terminal has established reliable wireless communication with the base station and the task processing center, which can maintain the node parking position, network topology, task information transmission and other functions. When performing the spectrum sensing task, #1 continuously listens in the L1 frequency band and divides the received signal into two paths in the RF power. One path is frequency converted to the L2 band and amplified and forwarded, and the other path is sampled and stored locally. #2 and #3 receive the L2 band data forwarded by #1, sample it, and after the corresponding data processing, perform a series of processes such as interference pattern loading, amplification, and transmission.

[0084] From the perspective of latency, the use of RF frequency conversion amplification and forwarding reduces the local processing latency (milliseconds), and the total latency is composed of hardware latency and air interface latency, which is microseconds. If the self-organizing transmission method is used to broadcast and distribute the processed information, the latency required for a single hop is about 10ms. For this scenario, the interference of the detected pulse signal through this fast frequency conversion support method can effectively achieve the effect of target cover.

[0085] From the energy perspective, the frequency conversion gain requirement of #1 is selected. The antenna gain is 6dBi, the receiving level of #2 and #3 needs to be -80dBm, the link attenuation of the L1 frequency band is about 133dB, and the engineering margin is set to 2dB to achieve the transmission requirement of 20km in line of sight. The forwarding power of #1 is calculated as follows:

[0086] Forwarding power = receiving level + transmission attenuation + engineering margin - transceiver antenna gain = -80 + 133 + 2-12 = 43dBm

[0087] In this scenario, the energy of the radar signal reaching #1 is -80dBm. Then:

[0088] Forwarding gain = 43-(-80)-6 = 117dB

[0089] It should be noted that in order to perform full-time domain monitoring and interference, from the perspective of co-frequency suppression, the radar wave signal received by #1 must always be more than 20dB stronger than the signals received from other nodes. Therefore, in this scenario, directional antennas can be given priority for nodes #2 and #3.

[0090] As can be seen from the above, the present invention solves the problem of discontinuous perception when nodes switch between different working modes by designing multi-channel RF frequency sharing, and can continuously perceive and reconstruct the electromagnetic space in real time. The system can be applied to the field of spectrum perception and reconstruction based on electromagnetic waves, such as urban pseudo base station detection and interference, malicious electromagnetic interference detection, radar detection and countermeasure systems, etc., and has broad application prospects in both military and civilian scenarios.

Claims

1. An electromagnetic space perception and construction system based on radio frequency forwarding, comprising a management center and multiple terminal devices communicating with each other, characterized in that: The management center deploys the perception task and the construction task to the terminal device, and collects data from the terminal device performing the perception task for fusion perception. The terminal device includes a first radio frequency module, a second radio frequency module, a reconnaissance and direction finding module, a signal processing module and a wireless communication module. When the terminal device performs the perception task, the first radio frequency module performs detection in the first frequency band, and divides the signal emitted by the non-cooperative radiation source detected into a first target signal and a second target signal. After the reconnaissance and direction finding module performs information analysis on the first target signal, specific data in the analysis result is extracted and sent to the management center through the wireless communication module. The specific data is used to obtain the location information and receiving time slot of the non-cooperative radiation source after fusion perception. The second radio frequency module converts the second target signal into amplified signal and then transmits it to the management center in the first The second radio frequency module detects the second target signal in the second frequency band when the terminal device performs the construction task, and the signal processing module generates multiple false target signals near the target position based on the received second target signal to form a virtual electromagnetic space, and the target position is the position where the cover target is located; the terminal device performing the construction task obtains the fused perception data of the management center through the wireless communication module, reconstructs the digital domain radio frequency signal of the second target signal based on the fused perception data through the signal processing module, generates multiple false target signals by coherence, and sends the false target signal through the first radio frequency module to form a virtual electromagnetic space; the terminal devices performing the construction task and the perception task are respectively recorded as construction nodes and perception nodes, and the pattern of the virtual electromagnetic space is: Wherein, L is the number of the construction nodes, N is the number of the false target signals generated by each construction node at time t, and A ij (t) is the amplitude of the jth false target signal generated by the i-th construction node, S(t) is the second target signal, R dif (t) is the adjustment distance difference, c is the propagation speed of electromagnetic waves in the air, ω ij is the Doppler shift, τ ij To adjust the delay, the adjustment delay can be positive or negative. By adjusting this parameter, multiple false target signals that arrive successively are formed within a time window, thereby adjusting the distance between the false target signal and the target position; The adjustment distance difference R dif According to the non-cooperative radiation source, the target location, the location information of the construction node and the location information of the sensing node, the following is calculated: Among them, R Tar is the distance from the target position to the non-cooperative radiation source, r1 is the distance from the non-cooperative radiation source to the sensing node, r2 is the distance from the sensing node to the construction node, and r3 is the distance from the construction node to the non-cooperative radiation source.

2. A method for sensing and constructing electromagnetic space based on radio frequency forwarding, characterized in that: The following steps are involved: Constructing a wireless transmission network, wherein the wireless transmission network includes a management center and a plurality of terminal devices that communicate with each other; The management center deploys the sensing task and the construction task to the terminal device, and the terminal device is divided into a sensing node and a construction node according to different deployment tasks; The sensing node detects in the first frequency band, and divides the detected signal emitted by the non-cooperative radiation source into a first target signal and a second target signal; The sensing node converts and amplifies the second target signal and sends it through the second frequency band, and analyzes the first target signal at the same time, and sends specific data in the analysis result to the management center, wherein the specific data is used to obtain the location information and receiving time slot of the non-cooperative radiation source after fusion sensing; The construction node acquires the second target signal and constructs a virtual electromagnetic space, wherein the virtual electromagnetic space includes a plurality of false target signals distributed near a target position, and the target position is a position where a cover target is located; The construction node constructs the virtual electromagnetic space by the following method: Acquire the non-cooperative radiation source, the target location, the location information of the sensing node and the location information of the construction node; The adjusted distance difference is calculated based on the non-cooperative radiation source, the target location, the location information of the construction node and the location information of the sensing node. Among them, R Tar is the distance from the target location to the non-cooperative radiation source, r1 is the distance from the non-cooperative radiation source to the sensing node, r2 is the distance from the sensing node to the construction node, and r3 is the distance from the construction node to the non-cooperative radiation source; Based on the adjustment distance difference R dif The delay parameter of the digital domain radio frequency signal reconstruction of the second target signal is adjusted, and a plurality of false target signals are generated near the target position to form the virtual electromagnetic space; the construction style of the virtual electromagnetic space is: Wherein, L is the number of the construction nodes, N is the number of the false target signals generated by each construction node at time t, and A ij (t) is the amplitude of the jth false target signal generated by the i-th construction node, S(t) is the second target signal, R dif (t) is the adjustment distance difference, c is the propagation speed of electromagnetic waves in the air, ω ij is the Doppler shift, τ ij To adjust the delay, the adjustment delay can be positive or negative. By adjusting this parameter, multiple false target signals that arrive successively are formed within a time window, thereby adjusting the distance between the false target signal and the target position.

3. The method according to claim 2, characterized in that The step also includes the management center performing fusion perception based on the received data to obtain the location information and receiving time slot of the non-cooperative radiation source.

4. The method according to claim 2, characterized in that: When the absolute value of the adjusted time delay is smaller than the receiving time slot of the non-cooperative radiation source, the virtual electromagnetic space forms interference coverage for the target location.

5. The method according to claim 2, characterized in that: The location information of the target location and the construction node is obtained through a satellite navigation system or the management center.

6. The method according to claim 5, characterized in that When the location information of the target location cannot be obtained within the preset time, the distance R from the target location to the non-cooperative radiation source is predicted by the following method: Tar : Based on historical data, calculate the location information update delay T of the target location delay and the moving speed V of the target position relative to the non-cooperative radiation source radar ; According to the distance R between the target position and the non-cooperative radiation source at the last moment Tar_old , the distance between the target position and the non-cooperative radiation source at the current moment is calculated to be R Tar =R Tar_old +V radar ×T delay .

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