A distributed jammer closed-loop coherent control method based on synthetic effect feedback
By introducing closed-loop control with feedback of synthesis effect into the distributed jammer system and establishing a phase difference-coherent synthesis efficiency mapping database, real-time compensation for hardware errors and adaptation to environmental changes are realized. This solves the problems of unpredictable hardware errors and high costs in existing technologies, and improves the robustness and stability of the system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- XIDIAN UNIV HANGZHOU RES INST
- Filing Date
- 2026-04-24
- Publication Date
- 2026-07-03
AI Technical Summary
Existing distributed jammer coherent synthesis methods based on high-precision open-loop pre-compensation suffer from problems in practical engineering, such as difficulty in predicting and compensating for hardware errors, lack of online self-optimization capabilities, and high hardware costs.
A closed-loop control method based on synthesis effect feedback is adopted. By establishing a phase difference-coherent synthesis efficiency mapping relationship database, the transmit phase of the jammer is monitored and dynamically adjusted in real time to achieve coherent synthesis.
It improves the robustness and engineering practicality of the system, reduces hardware costs and power consumption, has dynamic self-correction capabilities, and can maintain a long-term stable and efficient interference effect in dynamic environments.
Smart Images
Figure CN122085228B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of electronic countermeasures technology, specifically relating to a closed-loop coherent control method for a distributed jammer based on synthetic effect feedback. Background Technology
[0002] In the field of electronic warfare, the use of distributed multi-jammer cooperative operations to overcome the limitations of single-platform jammers in terms of power and spatial dimensions has become an important development direction. Its core idea is to coordinate multiple spatially separated jammers to coherently combine their transmitted signals at the target radar receiver, thereby achieving significant jamming gain. This coherent combining can greatly increase the equivalent radiated power of the jamming signal, forming effective concentrated energy suppression jamming, or, by precisely controlling the wavefront of the synthesized signal, generate dense false targets with specific angle and range information to implement advanced deception jamming.
[0003] Currently, commonly used coherent signal combining methods mainly rely on high-precision open-loop pre-compensation strategies. This requires constructing an accurate model, which presupposes obtaining precise global information, including the precise geometric relationships between each jammer and the radar, and a highly synchronized spatiotemporal reference among the nodes. Based on this, the precise timing advance, initial carrier phase, and amplitude parameters required for each jammer's signal transmission are calculated using an ideal channel model, and commands are issued to each jammer to execute according to these preset parameters. Essentially, this method relies on an open-loop control logic of "measurement-calculation-execution." Its design goal is to compensate for path differences and hardware differences through precise pre-measurement and calculation, ultimately achieving in-phase superposition of signals at the target point.
[0004] However, existing high-precision open-loop pre-compensation methods tend to over-idealize real-world engineering problems, leading to a sharp decline in performance under real-world conditions. This results in poor robustness of the open-loop mechanism, specifically in the following aspects: First, this method places extremely stringent demands on modeling accuracy and hardware infrastructure. Any errors not included in the model, such as the inherent amplitude-phase inconsistencies in the RF front-ends of each jammer that drift with temperature and operating time, cannot be compensated, directly disrupting coherent synthesis conditions. Second, this method is essentially a "one-off" open-loop control, lacking the ability to perceive and adjust the final synthesis effect within a closed loop. If environmental changes, such as platform movement, atmospheric disturbances, or changes in device state, cause a degradation in synthesis performance, it cannot detect this and make online adjustments, making it difficult to maintain stable interference effects. Finally, to achieve high-precision time synchronization and position awareness, it is necessary to rely on high-precision clock sources, such as atomic clocks or disciplined clocks, and high-precision positioning, significantly increasing the cost, size, and power consumption of individual nodes, contradicting the initial goal of low cost and high redundancy in distributed systems.
[0005] In summary, existing high-precision open-loop pre-compensation methods suffer from several drawbacks, including difficulty in predicting and compensating for actual hardware errors, a lack of online self-optimization capabilities, and a surge in hardware costs due to time synchronization requirements. Therefore, there is an urgent need to develop a closed-loop coherent control method for a distributed interference machine based on synthetic effect feedback to effectively address these issues. Summary of the Invention
[0006] The purpose of this invention is to provide a closed-loop coherent control method for distributed jammers based on synthesis effect feedback. This method fundamentally eliminates the reliance on absolute accuracy and ideal models. By introducing direct measurement of the actual synthesis effect in space as a feedback signal, and employing a closed-loop control approach, coherent synthesis is achieved through an effect feedback-closed-loop control mechanism. This solves the problem of enabling multiple distributed jammers to achieve and stably maintain coherent synthesis of transmitted signals at the target receiver under actual engineering conditions with unpredictable hardware errors.
[0007] This invention is achieved through the following technical solution:
[0008] A closed-loop coherent control method for a distributed interference machine based on synthetic effect feedback includes the following steps:
[0009] A. Modeling the coherent synthesis efficiency of signals, obtaining the coherent synthesis efficiency of jammer A and jammer B under different phase differences in error-free conditions, and establishing a reference database of phase difference-coherent synthesis efficiency mapping relationship;
[0010] B. Phase correction of AB jammer:
[0011] Calculate the actual coherent combining efficiency of jammer A and jammer B, and determine whether the coherent combining efficiency stably exceeds 90%. If yes, the AB phase correction is complete. If not, retrieve the phase correction factor, i.e., the phase difference, from the reference database. Monitor the pulse signals transmitted by jammer A and jammer B received by the receiver, obtain the corrected phase required for jammer B, and apply the corresponding phase compensation until the coherent combining efficiency of jammer AB continuously reaches or exceeds the 90% threshold, i.e., the jammer AB correction is complete.
[0012] C. Jammer AC correction:
[0013] First, calculate the coherent combining efficiency of jammer A and jammer C, and determine whether the coherent combining efficiency stably exceeds 90%. If so, AC phase correction is completed, and jammer A, jammer B, and jammer C have completed coherent correction. If not, retrieve the phase correction factor from the database. Monitor the pulse signals transmitted by jammer A and jammer C received by the receiver to obtain the coherent combining efficiency of the signals between jammer A and jammer C. Obtain the corrected phase required for jammer C and apply corresponding phase compensation to it until the coherent combining efficiency of the AC source continuously reaches the 90% threshold, that is, the coherent combining phase correction of jammer A, jammer B, and jammer C is completed.
[0014] Further, step A specifically involves: jammer A and jammer B transmitting the same pulse signal, and monitoring the received signal by the receiver; under ideal error-free conditions, constructing the relationship between the phase shift of jammer B relative to jammer A and the coherent synthesis efficiency, and establishing a reference database of the mapping relationship curve between the phase difference between jammer B and jammer A and the corresponding coherent synthesis efficiency.
[0015] Furthermore, the signal coherent synthesis efficiency is obtained by calculating the superposition energy of the synthesized signals from jammer A and jammer B received by the receiver;
[0016] Suppose that the discrete signals received by the receiver from jammer A and jammer B are respectively:
[0017] ;
[0018] ;
[0019] in, Assuming the amplitude is equal for both paths, For frequency, Let B be the phase difference relative to A, i.e., the variable to be mapped; calculate... To determine the coherent combining efficiency of two signals within the 0-359° range, we first calculate the energy of the combined signal:
[0020] ;
[0021] ;
[0022] in, This represents the nth discrete sample value of the synthesized signal from two jammers. This represents the combined energy of the two jammers. Indicates modulo;
[0023] By obtaining the coherent combining efficiency under different phase differences, a database of mapping relationships between the two is established. The formula for the signal coherent combining efficiency is:
[0024] .
[0025] Furthermore, step B specifically includes the following steps:
[0026] B1. Match and compare the actual coherent synthesis efficiency with the curves in the established reference database to determine whether the actual coherent synthesis efficiency meets the preset coherence judgment conditions.
[0027] B2. Calculate the compensation amount required to correct the phase difference to zero, i.e., complete in-phase, and perform dynamic closed-loop correction on the emission phase of radiation source B accordingly.
[0028] B3. Lock the phase relationship between jammer A and jammer B, and obtain the final phase correction factor, which will not change. This gives the phase correction factor of jammer B.
[0029] Furthermore, step B1 specifically includes the following steps:
[0030] B11. Determine whether the actual coherent synthesis efficiency of jammer A and jammer B consistently reaches or exceeds the 90% threshold; if the actual coherent synthesis efficiency of jammer A and jammer B does not exceed the 90% threshold, then perform a coherent synthesis efficiency similarity comparison.
[0031] B12. Load the reference database of phase error and coherent synthesis efficiency, search the reference database for the coherent synthesis efficiency value that is most similar to the measured value, and perform reverse retrieval, that is, deduce the most likely actual phase difference; perform similarity comparison on the database, and the phase difference corresponding to the closest coherent synthesis efficiency is the phase difference to be corrected.
[0032] Furthermore, in step B11, if the condition is met for two consecutive measurement cycles, it is considered that the two have achieved stable and efficient phase synchronization, and then the jammer AB phase correction is performed.
[0033] Furthermore, the formula for calculating the coherent synthesis efficiency is:
[0034] (1)
[0035] (2)
[0036] (3)
[0037] In the formula, Indicates the coherent synthesis efficiency. , and These represent the radiated signals from the three jammers at the receiver. This represents the actual combined power. Indicates the coherent combined power;
[0038] Phase correction factor: The phase shift corresponding to the actual coherent combining efficiency is obtained through similarity comparison. The similarity comparison formula is as follows:
[0039] (4)
[0040] In the formula, This represents the coherent combining efficiency under different phase shifts in the absence of interference noise. This represents the actual coherent synthesis efficiency. Indicates similarity; The phase offset of the corresponding index is the calculated phase offset, which is then compensated to obtain the phase correction factor.
[0041] Compared with the prior art, the beneficial effects of the present invention are:
[0042] 1. This method significantly improves robustness and engineering applicability: Existing technologies heavily rely on accurate global models and high-precision devices; any model mismatch or unmodeled hardware drift will lead to synthesis failure. This invention, however, actively compensates for errors from all sources through real-time feedback and dynamic adjustment, including inherent hardware errors, temperature drift, and position measurement errors. It does not depend on or pursue absolutely ideal model and device accuracy, thus enabling stable and reliable operation in real, non-ideal dynamic environments, and has strong engineering applicability.
[0043] 2. Effectively reduces cost, power consumption, and complexity: Existing technologies, in order to achieve nanosecond-level time synchronization and centimeter-level positioning, must rely on high-precision clock sources, such as atomic clocks and high-performance positioning systems, resulting in high costs per node. This invention, guided by the principle of "synthetic effect," relaxes the stringent requirements for the absolute spatiotemporal accuracy of individual nodes, allowing the use of lower-cost, lower-precision, common commercial-grade devices for construction. It also simplifies the complexity of initial calibration and setup, thereby significantly reducing the hardware cost, power consumption, and deployment and maintenance difficulty of the entire distributed approach.
[0044] 3. It endows the invention with dynamic self-correction and long-term stability capabilities: Existing open-loop methods are "blindly transmitted" after initialization, unable to cope with performance degradation caused by environmental changes. The closed-loop characteristic of this invention makes it an intelligent "adaptive" mechanism, capable of continuously monitoring performance and fine-tuning in real time, automatically maintaining the optimal coherent synthesis state. This not only ensures the long-term stability of the interference effect within the mission time, but also enables the method to adapt to dynamic scenarios such as platform movement and channel changes—a key advantage that traditional open-loop methods completely lack. Attached Figure Description
[0045] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0046] Figure 1 This is a schematic diagram of the coherent correction process;
[0047] Figure 2 Flowchart of phase correction for AB jammer;
[0048] Figure 3 This represents the coherent synthesis efficiency corresponding to the phase error offset.
[0049] Figure 4 To improve the coherent synthesis efficiency under closed-loop coherent control of a distributed interference machine that utilizes feedback from the synthesis effect;
[0050] Figure 5 The average coherent synthesis efficiency under closed-loop coherent control of a distributed interference machine with 50 synthesis effect feedbacks.
[0051] Figure 6 This is a flowchart illustrating the steps of a closed-loop coherent control method for a distributed interference machine based on synthetic effect feedback. Detailed Implementation
[0052] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.
[0053] Existing collaborative methods based on ideal geometric models and fixed parameters for open-loop pre-calculation cannot compensate for random and time-varying amplitude and phase errors introduced by various jammer transmission channels, such as power amplifiers, filters, and mixers. These errors render carefully calculated synchronization parameters ineffective after actual execution, resulting in ineffective coherent signal synthesis in space and making it difficult to predict and compensate for actual hardware errors. Meanwhile, traditional synchronization mechanisms lack real-time perception and feedback of the synthesis effect after initialization. When synthesis performance degrades due to device temperature drift, platform movement, or environmental changes, they cannot autonomously adjust and compensate, thus failing to maintain a long-term, stable, high-performance jamming state in dynamic environments and lacking online self-optimization capabilities. Furthermore, existing methods generally pursue unattainable intermediate indicators such as "time synchronization accuracy" to achieve coherent synthesis, forcing the use of expensive hardware such as high-precision clock sources, leading to a surge in costs. However, even if these intermediate indicators are precisely controlled at a high cost, it cannot be guaranteed that the final synthesis effect at the target receiver will be optimal after the signal has passed through a non-ideal transmission link and spatial propagation, resulting in a mismatch between resource investment and final performance, and causing a surge in hardware costs due to time synchronization requirements.
[0054] To address this, this invention constructs a closed-loop collaborative control system that is independent of ideal models and absolute spatiotemporal references and is guided by the final synthesis effect. By introducing a closed-loop control mechanism based on synthesis effect feedback, it fundamentally solves the vulnerability of high-precision open-loop pre-compensation methods in engineering practice. In the coherent synthesis process of distributed jammers, precise phase synchronization of the transmitted signals from each jammer is a crucial prerequisite for achieving high-gain synthesis and precise wavefront control of the jamming signals at the radar receiver.
[0055] Specifically, this invention provides a closed-loop coherent control method for a distributed interference machine based on synthesis effect feedback, such as... Figure 6 As shown, it includes the following steps:
[0056] 1. Model the coherent synthesis efficiency of the signal, obtain the coherent synthesis efficiency of jammer A and jammer B under different phase differences in the error-free case, and establish a reference database of phase difference-coherent synthesis efficiency mapping relationship.
[0057] Specifically, jammer A and jammer B transmit the same pulse signal, and the receiver monitors the received signal. Under ideal, error-free conditions, the relationship between the phase shift of jammer B relative to jammer A and the coherent combining efficiency is constructed. A reference database, i.e., a pre-stored database, is established through theoretical calculations or pre-calibration to create a mapping relationship curve between the "phase difference between jammer B and jammer A" and the "corresponding coherent combining efficiency." The curves are as follows: Figure 3 As shown.
[0058] The signal coherent synthesis efficiency is obtained by calculating the superposition energy of the synthesized signals from jammer A and jammer B received by the receiver.
[0059] Suppose that the discrete signals received by the receiver from jammer A and jammer B are respectively:
[0060] ;
[0061] ;
[0062] in, The amplitude (assuming the two paths are equal). For frequency, Let B be the phase difference relative to A (i.e., the variable to be mapped). The following calculations are performed. To determine the coherent combining efficiency of two signals within the 0-359° range, we first calculate the energy of the combined signal:
[0063] ;
[0064] ;
[0065] in, This represents the nth discrete sample value of the synthesized signal from two jammers. This represents the combined energy of the two jammers. This indicates taking the modulus.
[0066] By obtaining the coherent combining efficiency under different phase differences, a database of mapping relationships between the two is established. The formula for the signal coherent combining efficiency is:
[0067] .
[0068] 2. AB Jammer Phase Correction: Calculate the actual coherent combining efficiency of jammers A and B, and determine if the coherent combining efficiency stably exceeds 90%. If yes, AB phase correction is complete; otherwise, retrieve the phase correction factor (phase difference) from the reference database to coherently combine the signals from different jammers. The monitoring receiver receives the pulse signals emitted by jammers A and B. Through energy monitoring and algorithm calculation, the required corrected phase for jammer B is obtained, and corresponding phase compensation is applied until the coherent combining efficiency of jammers A and B continuously reaches or exceeds the 90% threshold, indicating that jammer AB correction is complete.
[0069] 21. Match and compare the actual coherent synthesis efficiency with the curves in the established reference database to determine whether the actual coherent synthesis efficiency meets the preset coherence judgment conditions.
[0070] 211. Determine whether the actual coherent combining efficiency of jammer A and jammer B consistently reaches or exceeds the 90% threshold. For example, if this condition is met for two consecutive measurement cycles, it is considered that the two have achieved stable and efficient phase synchronization, and phase correction of jammers A and B is performed. If the actual coherent combining efficiency of jammer A and jammer B does not exceed the 90% threshold, a coherent combining efficiency similarity comparison is performed.
[0071] 212. Load a reference database of phase error and coherent synthesis efficiency. Search the database for the coherent synthesis efficiency value most similar to the measured value, and perform a reverse search to retrieve the most likely actual phase difference. Compare the database for similarity; the phase difference corresponding to the closest coherent synthesis efficiency is the phase difference to be corrected.
[0072] 22. Calculate the amount of compensation required to correct the phase difference to zero, i.e., to achieve complete in-phase, and then perform dynamic closed-loop correction of the emission phase of radiation source B accordingly.
[0073] 23. Lock the phase relationship between jammer A and jammer B, and obtain the final phase correction factor, which will not change. This gives the phase correction factor of jammer B.
[0074] 3. Jammer AC Correction: Similar to step 2, first calculate the coherent combining efficiency of jammers A and C, and determine whether the coherent combining efficiency stably exceeds 90%. If yes, AC phase correction is complete, and jammers A, B, and C have completed coherent correction. If not, retrieve the phase correction factor from the database. Monitor the pulse signals transmitted by jammers A and C using the receiver to obtain the coherent combining efficiency between jammers A and C. Then, through energy monitoring and algorithm calculation, obtain the required correction phase for jammer C and apply corresponding phase compensation until the AC coherent combining efficiency of the radiation source continuously reaches the 90% threshold, meaning the coherent combining phase correction of jammers A, B, and C is complete.
[0075] In this invention, the formula for calculating the coherent synthesis efficiency is:
[0076] (1)
[0077] (2)
[0078] (3)
[0079] In the formula, Indicates the coherent synthesis efficiency. , and These represent the radiated signals from the three jammers at the receiver. This represents the actual combined power. This represents the coherent combined power.
[0080] Phase correction factor: The phase shift corresponding to the actual coherent combining efficiency is obtained through similarity comparison. The similarity comparison formula is as follows:
[0081] (4)
[0082] In the formula, This represents the coherent combining efficiency under different phase shifts in the absence of interference noise. This represents the actual coherent synthesis efficiency. Indicates similarity. The phase offset of the corresponding index is the calculated phase offset, which is then compensated to obtain the phase correction factor.
[0083] The innovation of this method lies in:
[0084] 1. This invention proposes a closed-loop control logic based on spatial synthesis effect feedback. It abandons the control of intermediate variables such as "time synchronization error" and instead uses the signal synthesis efficiency actually measured at the target spatial point or monitoring point, such as synthesis power and correlation function peak value, as the only and most direct feedback quantity to dynamically adjust the transmission phase of each jammer.
[0085] 2. This invention employs a sequential chain-like collaborative calibration as an efficient architecture for achieving closed-loop control. Specifically, a progressive, chain-like calibration sequence is adopted. First, the second node is calibrated using the first node as a reference. After the two nodes achieve coherence, the "synthetic source" formed by the first two nodes is used as a new reference to calibrate the third node, and so on, until all nodes are incorporated into a coherent whole.
[0086] 3. This invention employs a phase inversion algorithm based on pre-stored database matching to achieve fast and accurate phase compensation. By pre-stored or online calculated reference databases of the "phase difference-synthesis efficiency" mapping relationship curves, and matching and retrieving the real-time measured synthesis efficiency with the database, the current actual phase difference is inverted, and then the accurate compensation amount is calculated. This method avoids the real-time online solution of complex channel models.
[0087] Example 1
[0088] This embodiment provides a sequential chain-like closed-loop phase calibration method for three distributed jammers, namely jammer A, jammer B, and jammer C, applicable to electronic warfare scenarios where the jammers and the target receiver are in a non-cooperative relationship. This method deploys an auxiliary monitoring receiver, using the actual measured synthetic signal performance in space as a unified feedback benchmark, to sequentially complete phase alignment and locking between each jammer, guiding the entire distributed approach to achieve and maintain a highly efficient coherent synthesis state, such as... Figure 1 As shown.
[0089] 1. First, coherent combining between jammer A and jammer B is initiated. In this stage, the phase of jammer A is used as the reference. To address the lack of phase feedback caused by non-cooperation between the transmitter and receiver, a monitoring receiver is deployed in the far-field direction of the transmit array, i.e., within the main lobe region of the signal combining. This receiver synchronously receives signals from both jammer A and jammer B and evaluates the current coherent combining efficiency by calculating the superposition energy of the combined signals.
[0090] Based on the actual synthesis efficiency value fed back from the monitoring receiver, a phase inversion algorithm based on matching a pre-stored database is executed. Specifically, firstly, under ideal error-free conditions, a reference database is established through theoretical calculation or pre-calibration to map the mapping relationship between the "phase difference between jammer B and jammer A" and the "corresponding coherent synthesis efficiency". During the calculation, the real-time measured synthesis efficiency value is matched and compared with the curve in the reference database. By searching for the efficiency value most similar to the measured value, the most likely actual phase difference is retrieved (inverted). Subsequently, the compensation amount required to correct this phase difference to zero (i.e., complete in-phase) is calculated, and the transmit phase of jammer B is dynamically corrected using this method in a closed-loop manner.
[0091] This adjustment process will continue until a preset synchronization condition is met. This condition is set as follows: when the coherent combining efficiency of jammer A and jammer B consistently reaches or exceeds a threshold of 90% (e.g., this condition is met for two consecutive measurement cycles), they are considered to have achieved stable and efficient phase synchronization. After this stage is completed, the phase relationship between jammer A and jammer B will be locked, and they will be considered as a synchronized combining unit. The specific process is as follows: Figure 2 As shown.
[0092] Subsequently, the second stage begins, involving the correction of jammer A to jammer C. The monitoring and correction process described above is repeated: the monitoring receiver begins evaluating the coherent combining efficiency of the signals between jammer A and jammer C. Similarly, through energy monitoring and algorithm calculation, the required corrected phase for radiation source C is obtained, and corresponding phase compensation is applied. This continues until the coherent combining efficiency of jammers A and C consistently reaches 90%, signifying successful completion of the coherent combining phase correction for all three radiation sources, and the system enters full-power combining operation.
[0093] The pre-stored database construction steps in this embodiment are as follows:
[0094] First, under error-free conditions, the relationship between the phase shift of jammer B relative to jammer A and the coherent combining efficiency is constructed. The simulation results are as follows: Figure 3 As shown.
[0095] The formula for calculating coherent combining efficiency is:
[0096] (1)
[0097] (2)
[0098] (3)
[0099] In the formula, , and These represent the radiation signals from the three radiation sources at the receiver. This represents the actual combined power. This represents the coherent combined power.
[0100] Phase correction factor: The phase shift corresponding to the actual coherent combining efficiency is obtained through similarity comparison. The similarity comparison formula is as follows:
[0101] (4)
[0102] In the formula, This represents the coherent combining efficiency under different phase shifts in the absence of interference noise. This represents the actual coherent synthesis efficiency. The phase offset of the corresponding index is the calculated phase offset, which is then compensated to obtain the phase correction factor.
[0103] To verify the effectiveness of the method proposed in this invention, a simulation experiment was conducted using the MATLAB platform, and the results were compared with traditional open-loop methods. The key parameter settings for the simulation environment are shown in Table 1. These parameters collectively define a typical distributed interference scenario:
[0104] Table 1:
[0105] parameter Setting value Number of jammers 3 units Interference mechanism type equilateral triangle jammer distance 3.8km jammer speed (258,100,0)m / s Synchronous determination threshold Coherent combining efficiency ≥90% for two consecutive pulses Phase error [0, 360°] Random value signal type Linear frequency modulation signal signal carrier frequency 3GHz Jammer forwarding amplitude error No more than 3dB Jammer forwarding frequency error No more than 5KHz
[0106] The distributed jammer is set to emit 15 pulse cycles. The simulation results of the coherent synthesis efficiency obtained by using the closed-loop coherent control of the distributed jammer with feedback from the synthesis effect are as follows: Figure 4 As shown.
[0107] First, jammers A and B transmit correction pulse signals. During the second and third pulse transmission cycles, the coherent combining efficiency of both jammers A and B exceeds 90%, indicating successful correction. Jammer B's phase correction factor is locked, and jammers A and B cease correction. Jammers A and C begin correction during the fourth pulse cycle. During the fifth and sixth pulse cycles, the coherent combining efficiency of both jammers A and C reaches over 90%, and jammer C's phase correction factor is locked. At this point, correction is complete, and the 3-node distributed collaborative coherent combining efficiency stabilizes above 98%.
[0108] This embodiment uses a distributed jammer closed-loop coherent control method based on synthesis effect feedback and a traditional open-loop pre-compensation method to perform 50 coherent synthesizations and calculate the average coherent synthesis efficiency simulation results, such as... Figure 5 As shown, in a typical scenario with initial hardware errors, this method only requires about 10 pulse cycles of correction to achieve rapid convergence and maintain a stable high level of over 90% in coherent synthesis efficiency, demonstrating excellent fast convergence characteristics and stable maintenance capabilities. In contrast, the traditional open-loop pre-compensation method fails to achieve effective coherent synthesis throughout the entire 15 pulse cycles, with its synthesis rate fluctuating only around 40% and exhibiting unstable jitter characteristics. The comparative results clearly reveal the fundamental limitation of the open-loop method in practical engineering applications: its stringent dependence on modeling accuracy and hardware consistency means that even a small unmodeled error can lead to collaborative failure. The closed-loop feedback mechanism in this embodiment, by monitoring the synthesis effect in real time and dynamically adjusting the transmission parameters, successfully overcomes the influence of inherent hardware errors, thereby achieving robust coherent synthesis of the distributed jammer.
[0109] This invention actively compensates for phase mismatch caused by any source, such as hardware errors, positional errors, and environmental changes, by monitoring the synthesis effect in real time and dynamically adjusting the transmission parameters of each node accordingly. It establishes a collaborative mechanism that does not rely on a high-precision absolute spatiotemporal reference and is oriented towards the final effect, reducing the dependence on single-point precision components and effectively improving engineering feasibility and economy. This invention can endow the method with the ability to self-correct online and maintain the optimal interference state in a long-term stable manner, significantly improving the robustness and practicality of distributed collaborative interference in real dynamic environments.
[0110] It will be understood by those skilled in the art that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims
1. A distributed jammer closed-loop coherent control method based on synthetic effect feedback, characterized in that, Includes the following steps: A. Modeling the coherent synthesis efficiency of signals, obtaining the coherent synthesis efficiency of jammer A and jammer B under different phase differences in error-free conditions, and establishing a reference database of phase difference-coherent synthesis efficiency mapping relationship; B. Phase correction of AB jammer: Calculate the actual coherent combining efficiency of jammer A and jammer B, and determine whether the coherent combining efficiency stably exceeds 90%. If yes, the AB phase correction is complete. If not, retrieve the phase correction factor, i.e., the phase difference, from the reference database. Monitor the pulse signals transmitted by jammer A and jammer B received by the receiver, obtain the corrected phase required for jammer B, and apply the corresponding phase compensation until the coherent combining efficiency of jammer AB continuously reaches or exceeds the 90% threshold, i.e., the jammer AB correction is complete. C. Jammer AC correction: First, calculate the coherent combining efficiency of jammer A and jammer C, and determine whether the coherent combining efficiency is stably above 90%; if so, AC phase correction is completed, and jammer A, jammer B, and jammer C complete coherent correction. If not, then the phase correction factor is retrieved from the database; the pulse signals transmitted by jammers A and C are monitored by the receiver to obtain the coherent synthesis efficiency between jammers A and C; the required correction phase for jammer C is obtained, and corresponding phase compensation is applied to it until the coherent synthesis efficiency of radiation source AC continuously reaches the threshold of 90%, that is, the coherent synthesis phase correction of jammers A, B and C is completed.
2. The closed-loop coherent control method for a distributed interference machine based on synthetic effect feedback as described in claim 1, characterized in that, Step A specifically involves: jammer A and jammer B transmitting the same pulse signal, and monitoring the received signal by the receiver; under ideal error-free conditions, constructing the relationship between the phase shift of jammer B relative to jammer A and the coherent synthesis efficiency, and establishing a reference database of the mapping relationship curves between the phase difference between jammer B and jammer A and the corresponding coherent synthesis efficiency.
3. The closed-loop coherent control method for a distributed interference machine based on synthetic effect feedback as described in claim 2, characterized in that: The signal coherent combining efficiency is obtained by calculating the superposition energy of the combined signals from jammer A and jammer B received by the receiver; Suppose that the discrete signals received by the receiver from jammer A and jammer B are respectively: ； ； in, Assuming the amplitude is equal for both paths, For frequency, Let B be the phase difference relative to A, i.e., the variable to be mapped; calculate... To determine the coherent combining efficiency of two signals within the 0-359° range, we first calculate the energy of the combined signal: ； ； in, This represents the nth discrete sample value of the synthesized signal from two jammers. This represents the combined energy of the two jammers. Indicates modulo; By obtaining the coherent combining efficiency under different phase differences, a database of mapping relationships between the two is established. The formula for the signal coherent combining efficiency is: 。 4. The closed-loop coherent control method for a distributed interference machine based on synthetic effect feedback as described in claim 1, characterized in that, Step B specifically includes the following steps: B1. Match and compare the actual coherent synthesis efficiency with the curves in the established reference database to determine whether the actual coherent synthesis efficiency meets the preset coherence judgment conditions. B2. Calculate the compensation amount required to correct the phase difference to zero, i.e., complete in-phase, and perform dynamic closed-loop correction on the emission phase of radiation source B accordingly. B3. Lock the phase relationship between jammer A and jammer B, and obtain the final phase correction factor, which will not change. This gives the phase correction factor of jammer B.
5. The closed-loop coherent control method for a distributed interference machine based on synthetic effect feedback according to claim 4, characterized in that, Step B1 specifically includes the following steps: B11. Determine whether the actual coherent synthesis efficiency of jammer A and jammer B consistently reaches or exceeds the 90% threshold; if the actual coherent synthesis efficiency of jammer A and jammer B does not exceed the 90% threshold, then perform a coherent synthesis efficiency similarity comparison. B12. Load the reference database of phase error and coherent synthesis efficiency, search the reference database for the coherent synthesis efficiency value that is most similar to the measured value, and perform reverse retrieval, that is, deduce the most likely actual phase difference; perform similarity comparison on the database, and the phase difference corresponding to the closest coherent synthesis efficiency is the phase difference to be corrected.
6. The closed-loop coherent control method for a distributed interference machine based on synthetic effect feedback as described in claim 5, characterized in that: Step B11: If the condition is met for two consecutive measurement cycles, it is considered that the two have achieved stable and efficient phase synchronization, and then the jammer AB phase correction is performed.
7. The closed-loop coherent control method for a distributed interference machine based on synthetic effect feedback according to claim 1, characterized in that, The formula for calculating coherent combining efficiency is: （1） （2） （3） In the formula, Indicates the coherent synthesis efficiency. , and These represent the radiated signals from the three jammers at the receiver. This represents the actual combined power. Indicates the coherent combined power; Phase correction factor: The phase shift corresponding to the actual coherent combining efficiency is obtained through similarity comparison. The similarity comparison formula is as follows: （4） In the formula, This represents the coherent combining efficiency under different phase shifts in the absence of interference noise. This represents the actual coherent synthesis efficiency. Indicates similarity; The phase offset of the corresponding index is the calculated phase offset, which is then compensated to obtain the phase correction factor.