Control method and system of L-band amplitude limiter

Abstract

The invention discloses a control method and system for an L-band amplitude limiter, and relates to the technical field of control methods, a plurality of amplitude limiting characteristics are determined based on the identification of multi-modal data, and the amplitude limiting mode of the L-band amplitude limiter is determined according to the plurality of amplitude limiting characteristics and the model and use scene of the L-band amplitude limiter. And the accuracy of the amplitude limiting mode of the L-band amplitude limiter is improved. Therefore, the amplitude limiting range of the L-band amplitude limiter is determined based on the current working data of each electronic component and the current working data of the L-band amplitude limiter, and a main amplitude limiting path and a secondary amplitude limiting path are determined according to the amplitude limiting range, the amplitude limiting mode and the corresponding working path of the L-band amplitude limiter; the working efficiency of the L-band amplitude limiter is determined based on the current working data of the L-band amplitude limiter, and the amplitude limiting control level of the L-band amplitude limiter is determined according to the working efficiency of the L-band amplitude limiter, the main amplitude limiting path and the secondary amplitude limiting path, so that the accuracy of the amplitude limiting control level of the L-band amplitude limiter is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of control methods, and particularly relates to a control method and system of an L-band limiter. BACKGROUND

[0002] With the development of science and technology, the L-band limiter is a radio frequency protection device working in the L-band (usually referring to the frequency range of 1-2 GHz), mainly used for limiting signal amplitude to prevent excessive input power from damaging sensitive components such as low-noise amplifiers and analog-to-digital converters in the back end. As an electronic component of the circuit distribution diagram, in the prior art, multiple working data of the L-band limiter are collected, and a limiting mode is determined according to the multiple working data of the L-band limiter, and the limiting mode cannot be autonomously controlled, which affects the further control of the main limiting path and the secondary limiting path, resulting in low precision of the limiting control level of the L-band limiter. SUMMARY

[0003] The present application aims to overcome the shortcomings of the prior art, and provides a control method and system of an L-band limiter.

[0004] The embodiment of the present application provides a control method of an L-band limiter, which comprises the following steps: determining a working path of the L-band limiter according to the position of the L-band limiter and a corresponding circuit distribution diagram; determining multiple limiting nodes according to the identification of the working path of the L-band limiter, and determining multiple modal data of the L-band limiter in a working stage according to limiting data and node positions of the multiple limiting nodes; determining multiple limiting features based on the identification of the multiple modal data, determining a limiting mode of the L-band limiter according to the multiple limiting features, a model of the L-band limiter and a use scenario, and triggering autonomous control of the limiting mode of the L-band limiter along with the state adjustment of electronic components in the circuit distribution diagram; in the circuit distribution diagram, determining a limiting range of the L-band limiter based on current working data of each electronic component and current working data of the L-band limiter, and determining a main limiting path and a secondary limiting path according to the limiting range of the L-band limiter, the limiting mode and the corresponding working path; determining a working efficiency of the L-band limiter based on the current working data of the L-band limiter, and determining a limiting control level of the L-band limiter according to the working efficiency of the L-band limiter, the main limiting path and the secondary limiting path.

[0005] The embodiment of the present application provides a control system of an L-band limiter, which is applied to the control method of the L-band limiter described above, and comprises:

[0006] A working path module is configured to determine a working path of the L-band limiter according to the position of the L-band limiter and a corresponding circuit distribution diagram.

[0007] The multimodal data module is used to identify multiple limiting nodes based on the identification of the working path of the L-band limiter, and to determine the multimodal data of the L-band limiter during the working phase based on the limiting data and node positions of the multiple limiting nodes.

[0008] The autonomous control module is used to identify multiple limiting features based on the recognition of the multimodal data, determine the limiting mode of the L-band limiter according to the multiple limiting features, the model of the L-band limiter and the usage scenario, and trigger the autonomous control of the limiting mode of the L-band limiter as the state of the electronic components in the circuit diagram is adjusted.

[0009] The limiting path module is used to determine the limiting range of the L-band limiter based on the current operating data of each electronic component and the current operating data of the L-band limiter in the circuit diagram, and to determine the main limiting path and the secondary limiting path according to the limiting range, limiting mode and corresponding operating path of the L-band limiter.

[0010] The limiting control level module is used to determine the working efficiency of the L-band limiter based on its current working data, and to determine the limiting control level of the L-band limiter based on its working efficiency, the primary limiting path, and the secondary limiting path.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] In this embodiment of the invention, multiple limiting features are determined based on the identification of multimodal data using the method described herein. The limiting mode of the L-band limiter is determined according to the multiple limiting features, the model of the L-band limiter, and the usage scenario. The autonomous control of the limiting mode of the L-band limiter is triggered by the adjustment of the state of the electronic components in the circuit diagram. This introduces multimodal data of the L-band limiter during its working phase, and takes into account multiple limiting features, the model of the L-band limiter, and the overall usage scenario. This improves the accuracy of the limiting mode of the L-band limiter and enables autonomous control of the limiting mode of the L-band limiter.

[0013] Therefore, in this circuit diagram, the limiting range of the L-band limiter is determined based on the current operating data of each electronic component and the current operating data of the L-band limiter. The primary and secondary limiting paths are determined according to the limiting range, limiting mode, and corresponding operating path of the L-band limiter. The operating efficiency of the L-band limiter is determined based on its current operating data, and the limiting control level of the L-band limiter is determined based on its operating efficiency, primary and secondary limiting paths. The introduction of primary and secondary limiting paths enhances the further control of the L-band limiter, achieving a holistic consideration of its operating efficiency, primary and secondary limiting paths, and improving the accuracy of the limiting control level. Attached Figure Description

[0014] Figure 1 This is a flowchart illustrating the control method of the L-band limiter in an embodiment of the present invention;

[0015] Figure 2 This is a flowchart illustrating step S11 in the control method of the L-band limiter in an embodiment of the present invention.

[0016] Figure 3 This is a flowchart illustrating step S12 in the control method of the L-band limiter in an embodiment of the present invention.

[0017] Figure 4 This is a flowchart illustrating step S13 in the control method of the L-band limiter in an embodiment of the present invention.

[0018] Figure 5 This is a flowchart illustrating step S14 in the control method of the L-band limiter in an embodiment of the present invention.

[0019] Figure 6 This is a flowchart illustrating step S15 in the control method of the L-band limiter in an embodiment of the present invention.

[0020] Figure 7 This is a schematic diagram of the structural composition of the control system of the L-band limiter in an embodiment of the present invention. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0022] Please see Figures 1 to 7 A control method for an L-band limiter, applied to control scenarios of L-band limiters; the control method for the L-band limiter includes:

[0023] Step S11: Determine the working path of the L-band limiter based on its location and corresponding circuit diagram;

[0024] Step S12: Based on the identification of the working path of the L-band limiter, determine multiple limiting nodes, and determine the multi-mode data of the L-band limiter during the working phase based on the limiting data and node positions of the multiple limiting nodes.

[0025] Step S13: Based on the identification of the multimodal data, determine multiple limiting features, determine the limiting mode of the L-band limiter according to the multiple limiting features, the model of the L-band limiter and the usage scenario, and trigger the autonomous control of the limiting mode of the L-band limiter as the state of the electronic components in the circuit diagram is adjusted.

[0026] Step S14: In the circuit diagram, the limiting range of the L-band limiter is determined based on the current operating data of each electronic component and the current operating data of the L-band limiter. The main limiting path and the secondary limiting path are determined according to the limiting range, limiting mode and corresponding operating path of the L-band limiter.

[0027] Step S15: Determine the working efficiency of the L-band limiter based on its current working data, and determine the limiting control level of the L-band limiter according to its working efficiency, the primary limiting path, and the secondary limiting path.

[0028] refer to Figure 2 In step S11, the specific steps are as follows:

[0029] S111: Collect the location of the L-band limiter, match the corresponding circuit diagram according to the location and model of the L-band limiter, and determine the multiple working areas of the L-band limiter in the circuit diagram based on the circuit diagram and the location of the L-band limiter.

[0030] S112: Based on the identification of multiple working areas, determine multiple sub-working paths. Based on the multiple sub-working paths, the position of the L-band limiter, and the working content of the L-band limiter in the circuit distribution diagram, determine the path synthesis method, and trigger the synthesis of multiple sub-working paths along the path synthesis method to output the working path of the L-band limiter.

[0031] In the embodiments of this application, the physical coordinates of the limiter are obtained through CAD design files or actual PCB layout, and the specific position of the limiter on the circuit board, including X and Y coordinates and layer information, is recorded to determine the positional relationship of the limiter relative to other key components (such as input / output ports, couplers, etc.). The datasheet of the device is consulted according to the model of the limiter (such as MA4P604-131, CLA4607-000, etc.), and the pin definitions in the datasheet are matched with the actual PCB layout to determine the electrical connection relationship of the limiter in the circuit diagram.

[0032] Simultaneously, the signal flow and power distribution in the circuit diagram were analyzed. Based on the function and power handling capacity of each part of the limiter, the working areas were divided, and the boundaries of these areas were determined considering heat dissipation paths and electrical characteristics. Specifically, the MA4P604-131 was confirmed as the first-stage limiting diode. Its pin definitions and electrical parameters were determined by consulting its datasheet and matching them with the PCB layout. The signal first enters the coupling and detection area. A 16dB coupler couples part of the signal to the detection diode, which generates a DC voltage, triggering the MA4P604-131 diode in the first-stage limiting area to conduct. The first-stage diode reflects most of the power, and the remaining signal enters the subsequent limiting area. The CLA series three-stage diodes attenuate the signal step by step, ensuring that the output power in the signal transmission area is ≤20dBm. Throughout the process, the heat dissipation paths in each area ensure that the devices are not overheated and burned out.

[0033] Region 1: Coupled Detection Region: Location Range: X-coordinate 10-20mm, Y-coordinate 20-30mm; Components Included: 16dB coupler, detector diode; Functional Characteristics: Coupling 16dB, Insertion Loss ≤0.2dB, VSWR ≤1.5; Power Characteristics: When the input pulse power is 100W, the power coupled to the detector diode is approximately 0.4W (peak); Circuit Characteristics: The main line and branch line of the coupler are coupled through a microstrip line, and the detector diode is connected to the coupling branch line through a DC blocking capacitor;

[0034] Region 2: First-level limiting region: Location range: X coordinate 30-40mm, Y coordinate 20-30mm; Components included: Two MA4P604-131 PIN diodes in parallel; Functional characteristics: Withstand voltage 1000V, on-resistance 1Ω; Heat dissipation characteristics: The negative terminals of the diodes are sintered on the cavity for direct heat dissipation; Power characteristics: Withstands most of the input power, and reflects approximately 15dB of power at a 100W input; Circuit characteristics: The negative terminals of the two diodes are connected in parallel to ground, and the positive terminals are connected to the microstrip line through a gold strip;

[0035] Region 3: Post-Stage Limiting Region: Location Range: X-coordinate 45-85mm, Y-coordinate 20-30mm; Components Included: CLA4607-000, CLA4604-000, CLA4601-000 three-stage diodes; Assembly Method: Pair assembly, bonded to the printed circuit board with high-power conductive adhesive; Functional Characteristics: Gradually attenuates the remaining signal to ensure output power ≤20dBm; Power Characteristics: Each stage withstands decreasing power; after the first stage reflection, the power entering this region is significantly reduced; Circuit Features: Each stage of diodes is connected by a 50Ω microstrip line, the length of which is optimized according to frequency characteristics;

[0036] Area 4: Signal Transmission Area: Location Range: Covers the entire limiter circuit, X-coordinate 5-95mm, Y-coordinate 20-30mm; Includes Components: Microstrip lines connecting each area, matching network, DC blocking capacitors, etc.; Functional Characteristics: Ensures low-loss signal transmission between areas and maintains good impedance matching; Electrical Characteristics: Microstrip line characteristic impedance 50Ω, total insertion loss ≤0.4dB, VSWR ≤1.5; Circuit Characteristics: According to... Figure 7 Transmission line networks optimized using link simulation models.

[0037] Furthermore, based on the four operating regions (coupled detection region, first-stage limiting region, subsequent limiting region, and signal transmission region) determined in S111, the signal flow direction and power transfer relationship between each region are analyzed, the main signal path and control path in each region are identified, and the different path activation situations under normal operating conditions and limiting conditions are considered. At the same time, the interrelationships and dependencies between each sub-path are analyzed, the path activation priority under different operating conditions is determined, the logical rules and triggering conditions for path synthesis are designed, and the influence of the limiter position on path synthesis is considered.

[0038] The synthesis of multiple sub-working paths is triggered along this path synthesis method to output the working path of the L-band limiter. The triggering mechanism and timing control of path synthesis are designed, the switching conditions and transition process between different synthesis methods are determined, the special processing requirements of pulse signals are considered, and the final output and monitoring of the working path are realized.

[0039] refer to Figure 3 In step S12, the specific steps are as follows:

[0040] S121: Collect the working path of the L-band limiter, determine multiple limiting intervals based on the identification of the working path of the L-band limiter, and determine the corresponding limiting nodes based on the location of the multiple limiting intervals and the multiple working areas of the L-band limiter, so as to collect multiple limiting nodes;

[0041] S122: Monitor the operation of multiple limiting nodes in real time and collect the limiting data of multiple limiting nodes. Based on the filtering of the limiting data of multiple limiting nodes, identify abnormal limiting nodes and remove them. Then, determine the multi-mode data of the L-band limiter during the working stage by using the limiting data and node positions of the remaining multiple limiting nodes. At this time, the multi-mode data contains the limiting data of each limiting node and matches the corresponding working status and the corresponding node position.

[0042] In the embodiments of this application, based on the working path determined in step S112, complete path information is obtained, key location points and electrical parameters on the path are recorded, the functional characteristics and working conditions of each segment on the path are determined, key inflection points of power change on the working path are analyzed, different limiting intervals are divided according to the degree of power attenuation, and the working characteristics and limiting effect of each interval are considered. Simultaneously, key monitoring points are determined as limiting nodes within each limiting interval, and nodes are set considering the boundaries and functional characteristics of the working area to ensure that the nodes can effectively reflect the limiting state of that interval. Furthermore, a node data acquisition system is designed, including sensors and data acquisition circuits, the acquisition frequency and accuracy requirements are determined, and a data association and time synchronization mechanism between nodes is established.

[0043] Specifically, the system obtains the precise location of the limiter on the PCB through CAD files, confirms the main signal flow path from the input port (5,25) to the output port (95,25), identifies the detection control path from the coupler branch to the bias terminals of each PIN diode, and determines the heat dissipation path from each diode to the external environment.

[0044] The system analyzes the power attenuation curve and identifies five key limiting ranges: Input coupling range: 100W → 99.6W, almost unlimited limiting effect; First-level limiting range: 99.6W → 31.6W, the main limiting range; Second-level limiting range: 31.6W → 3.16W, medium limiting effect; Third-level limiting range: 3.16W → 0.316W, fine limiting effect; Fourth-level limiting range: 0.316W → 0.1W, final limiting control; Simultaneously, a switch is set within each limiting range. Key monitoring nodes: Node 1 (10,25): Monitors input power and frequency characteristics; Node 2 (20,25): Monitors coupler performance and coupling degree; Node 3 (35,25): Monitors the status and temperature of the first-stage diode; Node 4 (50,25): Monitors the conduction status of the second-stage diode; Node 5 (65,25): Monitors the conduction status of the third-stage diode; Node 6 (80,25): Monitors the output control of the fourth-stage diode; Node 7 (90,25): Monitors the final output power and quality.

[0045] The power monitoring system collects power data from nodes 1, 2, and 7 at a frequency of 1MHz; the diode status acquisition system collects the conduction status of nodes 3-6 at a frequency of 100kHz; the temperature monitoring system collects temperature data from node 3 at a frequency of 10kHz; and the electrical characteristic acquisition system collects the VSWR and impedance of all nodes at a frequency of 10kHz. Through this detailed acquisition process of the limiting nodes, the L-band limiter can achieve comprehensive monitoring of its operating status, providing basic data support for subsequent multimodal data analysis and intelligent control. This acquisition method is particularly suitable for the semi-active limiter structure described in the technical briefing, and can effectively monitor the operating status of the MA4P604-131 first-stage diode and the CLA series subsequent-stage diodes, ensuring stable operation under conditions of 100W pulse, 100µs pulse width, and 10% duty cycle.

[0046] Furthermore, a real-time node monitoring system is established to continuously track the status of each node. A monitoring interface and data visualization scheme are designed to realize a real-time alarm mechanism for abnormal states. At the same time, a data acquisition protocol and storage format are designed to ensure the synchronization and accuracy of data timestamps and to establish a data quality control mechanism.

[0047] An anomaly detection algorithm and threshold judgment mechanism are introduced, considering the statistical characteristics and temporal correlation of the data. A multi-parameter joint judgment anomaly detection method is established, and an anomaly node removal algorithm and data replacement strategy are designed. Considering the integrity and continuity of the removed data, a recovery mechanism for removed nodes is established. The amplitude-limiting data and node positions of the remaining multiple amplitude-limiting nodes are used to determine multimodal data. A multimodal data fusion algorithm and storage structure are designed to ensure the spatiotemporal consistency and correlation of the data, and an indexing and querying mechanism for multimodal data is established. A data matching algorithm is designed to associate amplitude-limiting data with working status, establish a spatial index relationship between node positions and data, and realize comprehensive query and analysis functions for multimodal data.

[0048] Specifically, an L-band limiter operating at 1.5 GHz is introduced, with an input signal of 100W pulse, 100µs pulse width, and 10% duty cycle. The system collects real-time data from seven limiting nodes. Node 1 (input monitoring node) detects a 100W pulse signal, Node 2 (coupler output node) detects a 99.6W signal, Node 3 (first-stage limiting node) detects the conduction of the MA4P604-131 diode, with the temperature rising to 80℃, Nodes 4-6 (subsequent-stage limiting nodes) detect the successive conduction of CLA series diodes, and Node 7 (output monitoring node) detects an output power of 18dBm. The system detects an abnormal temperature change rate (15℃ / s) at Node 3, marking it as an abnormal node. A temporary rejection strategy is adopted, replacing the current temperature data with historical normal data. Data from other nodes is normal and is retained for multimodal data analysis.

[0049] Multimodal data construction includes: spatiotemporal correlation data (recording data changes of each node during a 100µs pulse), power flow data (constructing a power attenuation map from 100W input to 18dBm output), thermal characteristic data (recording the temperature change curve of the first-stage diode), and electrical characteristic data (recording the VSWR and impedance changes of each node). The system identifies a high-power state, locates the hotspot region (first-stage limiting region) based on a coordinate system, aligns the data changes of each node during the pulse, and analyzes the correlation between power, temperature, and electrical parameters. Through this detailed acquisition of limiting nodes, anomaly handling, and multimodal data construction, the L-band limiter can achieve precise monitoring and intelligent control of its operating status, ensuring stable and reliable limiting performance under various operating conditions.

[0050] refer to Figure 4 In step S13, the specific steps are as follows:

[0051] S131: Collect the multimodal data, identify the multi-layer working combination of the L-band limiter based on the identification of the multimodal data, and determine the corresponding multiple limiting features based on the identification of the multi-layer working combination of the L-band limiter.

[0052] S132: Collect the model and usage scenario of the L-band limiter, determine the first mode coefficient based on multiple limiting features and the model of the L-band limiter, determine the second mode coefficient based on multiple limiting features and the usage scenario of the L-band limiter, and determine the limiting mode of the L-band limiter based on the mapping relationship between the first mode coefficient, the second mode coefficient and the limiting mode;

[0053] S133: Based on the traversal of the circuit diagram, determine the electronic components in the circuit diagram and mark the state of each electronic component. Determine the target working content of the L-band limiter according to the state of each electronic component, and trigger the autonomous control of the limiting mode of the L-band limiter according to the target working content.

[0054] In the embodiments of this application, the constructed multimodal data, including spatiotemporal correlation data, power flow data, thermal characteristic data, and electrical characteristic data, is acquired from S122. The data format is ensured to be uniform, timestamps synchronized, and high precision (microsecond level). The data should cover different power states (low, medium, and high power) and different operating conditions (such as temperature changes, frequency shifts, etc.). The acquired multimodal data is processed in layers to identify different dimensions of operating combinations. Each layer represents different operating characteristics, such as power, temperature, electrical, and control characteristics, and there should be clear correlations and dependencies between layers. Key feature parameters are extracted from each operating combination. These features should reflect the operating state and performance of the limiter, and the features should have clear physical meaning and engineering value.

[0055] Specifically, spatiotemporal correlation data acquisition: Data content: Time series data of each node during a 100us pulse; Acquisition format: Timestamp + Node ID + Parameter value + Coordinate position; Specific data: Node 1 (10,25): Time = 0us, Power = 100W; Node 2 (20,25): Time = 1us, Power = 99.6W; Node 3 (35,25): Time = 2us, Power = 31.6W, Temperature = 80℃; Node 4 (50,25): Time = 3us, Power = 3.16W; Node 5 (65,25): Time = 4us, Power = 0.316W; Node 6 (80,25): Time = 5us, Power = 0.1W; Node 7 (90,25): Time = 6us, Power = 18dBm.

[0056] Power Flow Data Acquisition: Data Content: Power attenuation diagram from input to output; Acquisition Format: Node Location + Input Power + Output Power + Attenuation; Specific Data: Input Node (5,25): Input Power = 100W; Coupler Node (15,25): Output Power = 99.6W, Attenuation = 0.2dB; First-Stage Limiting Node (35,25): Output Power = 31.6W, Attenuation = 15dB; Second-Stage Limiting Node (50,25): Output Power = 3.16W, Attenuation = 10dB; Third-Stage Limiting Node (65,25): Output Power = 0.316W, Attenuation = 10dB; Fourth-Stage Limiting Node (80,25): Output Power = 0.1W, Attenuation = 5dB; Output Node (95,25): Output Power = 18dBm, Total Attenuation = 82dB;

[0057] Thermal characteristic data acquisition: Data content: Temperature change curves of diodes at each stage; Acquisition format: Timestamp + Node ID + Temperature value + Temperature change rate; Specific data: Node 3 (35,25): Time = 0us, Temperature = 25℃, Change rate = 0℃ / s; Node 3 (35,25): Time = 50us, Temperature = 60℃, Change rate = 10℃ / s; Node 3 (35,25): Time = 100us, Temperature = 80℃, Change rate = 15℃ / s; Node 4 (50,25): Time = 100us, Temperature = 40℃, Change rate = 5℃ / s; Node 5 (65,25): Time = 100us, Temperature = 30℃, Change rate = 3℃ / s; Node 6 (80,25): Time = 100us, Temperature = 25℃, Change rate = 1℃ / s;

[0058] Electrical characteristic data acquisition: Data content: VSWR, impedance, and other parameters for each node; Acquisition format: Timestamp + Node ID + VSWR + Impedance + Phase; Specific data: Node 1 (10,25): VSWR = 1.2, Impedance = 50Ω, Phase = 0°; Node 2 (20,25): VSWR = 1.3, Impedance = 48Ω, Phase = 5°; Node 3 (35,25): VSWR = 1.4, Impedance = 45Ω, phase = 10°; Node 4 (50, 25): VSWR = 1.4, impedance = 48Ω, phase = 15°; Node 5 (65, 25): VSWR = 1.5, impedance = 50Ω, phase = 20°; Node 6 (80, 25): VSWR = 1.5, impedance = 50Ω, phase = 25°; Node 7 (90, 25): VSWR = 1.5, impedance = 50Ω, phase = 30°.

[0059] Based on the collected multimodal data, the following multi-layer operating combinations can be identified: Power Layer Operating Combination: Layer Definition: Based on power transmission and attenuation characteristics; Combination Content: Input Power Sublayer: 100W pulse power; Coupled Power Sublayer: 99.6W (coupling loss 0.2dB); First-level Limiting Sublayer: 31.6W (attenuation 15dB); Second-level Limiting Sublayer: 3.16W (attenuation 10dB); Third-level Limiting Sublayer: 0.316W (attenuation 10dB); Fourth-level Limiting Sublayer: 0.1W (attenuation 5dB); Output Power Sublayer: 18dBm (total attenuation 82dB); Layer Characteristics: Power attenuates progressively at each level, with different attenuation amounts at each level;

[0060] Temperature Layer Working Combination: Layer Definition: Based on heat conduction and temperature distribution; Combination Content: First-level temperature sublayer: 80℃ (highest temperature point); Second-level temperature sublayer: 40℃ (medium temperature); Third-level temperature sublayer: 30℃ (lower temperature); Fourth-level temperature sublayer: 25℃ (close to ambient temperature); Temperature Gradient Sublayer: Temperature distribution from 80℃ to 25℃; Layer Characteristics: Temperature decreases gradually, with the first level being the main heat source;

[0061] Electrical layer working combination: Impedance matching sublayer: 50Ω→48Ω→45Ω→48Ω→50Ω;

[0062] Standing wave ratio sublayer: 1.2→1.3→1.4→1.4→1.5→1.5→1.5;

[0063] Phase change sublayer: 0°→5°→10°→15°→20°→25°→30°;

[0064] Reflection coefficient sublayer: .1→0.15→0.2→0.2→0.25→0.25→0.25;

[0065] Hierarchical characteristics: Electrical parameters change step by step, reflecting signal transmission quality; Control layer working combination: Hierarchical definition: based on control signals and response characteristics; Combination content: Detection control sub-layer: 5V DC control voltage; Diode conduction sub-layer: MA4P604-131 on-resistance 1Ω; Sub-stage control sub-layer: CLA series diode on-resistance 2-4Ω; Response time sub-layer: fast response <1μs; Recovery time sub-layer: fast recovery <10μs; Hierarchical characteristics: Fast response of control signals to achieve precise amplitude limiting.

[0066] Based on the above multi-layer working combination, the following limiting characteristics can be determined: Power characteristics: Characteristic 1: Input power characteristic value = 100W (pulse peak power); Characteristic 2: Output power characteristic value = 18dBm (power after limiting); Characteristic 3: Total attenuation characteristic value = 82dB (from 100W to 18dBm); Characteristic 4: First stage attenuation characteristic value = 15dB (main attenuation stage); Characteristic 5: Subsequent stage attenuation characteristic value = 25dB (fine attenuation stage); Characteristic 6: Power control accuracy = ±2dB (output power stability); Temperature characteristics: Characteristic 1: Maximum temperature characteristic value = 80℃ (first stage diode); Characteristic 2: Temperature gradient characteristic value = 55℃ / cm (from first stage to output); Characteristic 3: Temperature change rate characteristic value = 15℃ / s (during pulse); Characteristic 4: Thermal equilibrium time characteristic value = 1ms (reaching thermal equilibrium); Characteristic 5: Heat dissipation efficiency characteristic value = 85% (heat dissipation ratio).

[0067] Electrical Characteristics: Characteristic 1: Input VSWR characteristic value = 1.2 (input matching quality); Characteristic 2: Output VSWR characteristic value = 1.5 (output matching quality); Characteristic 3: Maximum reflection coefficient characteristic value = 0.25 (reflected power ratio); Characteristic 4: Impedance variation range characteristic value = 45-50Ω (impedance stability); Characteristic 5: Phase linearity characteristic value = ±5° (phase distortion); Control Characteristics: Characteristic 1: Detector voltage characteristic value = 5V (control voltage); Characteristic 2: Response time characteristic value = <1μs (limiting start time); Characteristic 3: Recovery time characteristic value = <10μs (Limiting recovery time); Feature 4: On-resistance characteristic value = 1-4Ω (diode conduction characteristic); Feature 5: Control accuracy characteristic value = ±0.5dB (limiting accuracy); Time characteristics: Feature 1: Pulse processing capability characteristic value = 100us (processable pulse width); Feature 2: Duty cycle adaptability characteristic value = 10% (adaptable duty cycle); Feature 3: Continuous working time characteristic value = >10000 hours (reliability); Feature 4: Frequency response characteristic value = 1-2GHz (operating bandwidth); Feature 5: Temperature adaptability characteristic value = -40℃~+85℃ (operating temperature range).

[0068] Furthermore, the model and usage scenario of the L-band limiter are collected. Based on multiple limiting features and the model of the L-band limiter, the first mode coefficient is determined. Based on multiple limiting features and the usage scenario of the L-band limiter, the second mode coefficient is determined. Based on the mapping relationship between the first mode coefficient, the second mode coefficient and the limiting mode, the limiting mode of the L-band limiter is determined. This approach takes into account the overall consideration of the mapping relationship between the first mode coefficient, the second mode coefficient and the limiting mode, ensuring the accuracy of the limiting mode of the L-band limiter.

[0069] At this point, the model and usage scenario of the L-band limiter should be collected. The model information should include the model, parameters, and performance indicators of key components, while the usage scenario information should include the application field, working environment, signal characteristics, and reliability requirements.

[0070] The first mode coefficient is determined based on multiple limiting characteristics and the model of the L-band limiter. Based on the limiting characteristics (power characteristics, temperature characteristics, electrical characteristics, control characteristics, and time characteristics) determined in S131, and combined with the technical parameters and performance indicators of the limiter model, a weighted calculation algorithm is designed to match each characteristic value with the model parameters and calculate the first mode coefficient. The first mode coefficient reflects the performance adaptability of the limiter based on the model.

[0071] Specifically, the model information is as follows: First-stage limiting diode model: MACOM MA4P604-131; Key parameters: 1000V withstand voltage, 1Ω on-resistance, sintered negative package; Performance indicators: High power handling capability, good heat dissipation; Subsequent-stage limiting diode models: CLA4607-000 / CLA4604-000 / CLA4601-000; Key parameters: On-resistance 2Ω / 3Ω / 4Ω respectively, paired assembly; Performance indicators: Step-by-step fine limiting, ensuring output power ≤20dBm; Coupler model: 16dB directional coupler; Key parameters: Coupling degree 16dB, insertion loss ≤0.2dB, VSWR ≤1.5; Performance indicators: High-precision coupling, low-loss transmission; Detector diode model: Schottky detector diode; Key parameters: Detection sensitivity 0.5mV / μW, response time <1ns; Performance indicators: Fast response, high-sensitivity detection.

[0072] Usage Scenario: Application Area: Radar receiver front-end protection; System Type: Pulse radar system; Operating Frequency Band: L-band (1-2GHz); Protected Objects: Low-noise amplifiers and other receiving components; Operating Environment: Temperature Range: -40℃~+85℃; Humidity Range: 5%~95% relative humidity; Vibration Conditions: 10-500Hz, 2.5g acceleration; Signal Characteristics: Signal Type: Pulse modulated signal; Pulse Power: 100W (peak); Pulse Width: 100μs; Duty Cycle: 10%; Repetition Frequency: 1kHz; Reliability Requirements: MTBF (Mean Time Between Failures): >10000 hours; Lifespan Requirement: >15 years; Maintenance Cycle: >5 years.

[0073] For the aforementioned 1.5GHz L-band limiter, the power characteristic matching is as follows: the input power characteristic value (100W) matches the MA4P604-131 withstand voltage value (1000V) with a matching degree of 0.95; the output power characteristic value (18dBm) matches the CLA4601-000 limiting capability with a matching degree of 0.90; the total attenuation characteristic value (82dB) matches the multi-stage limiting structure with a matching degree of 0.85; and the power control accuracy characteristic value (±2dB) matches the detection circuit accuracy with a matching degree of 0.80.

[0074] Temperature characteristic matching: The matching degree between the highest temperature characteristic value (80℃) and the heat dissipation performance of MA4P604-131 is 0.90; the matching degree between the temperature gradient characteristic value (55℃ / cm) and the sintered heat dissipation structure is 0.85; the matching degree between the temperature change rate characteristic value (15℃ / s) and the heat capacity is 0.80; the matching degree between the heat dissipation efficiency characteristic value (85%) and the cavity heat dissipation design is 0.90.

[0075] Electrical characteristic matching: Input VSWR characteristic value (1.2) matching degree with input matching network: 0.95; Output VSWR characteristic value (1.5) matching degree with output matching network: 0.90; Impedance variation range characteristic value (45-50Ω) matching degree with microstrip line design: 0.85; Phase linearity characteristic value (±5°) matching degree with transmission line design: 0.80.

[0076] Control characteristic matching: Matching degree between the detector voltage characteristic value (5V) and the Schottky diode characteristic: 0.95; Matching degree between the response time characteristic value (<1μs) and the PIN diode response speed: 0.90; Matching degree between the on-resistance characteristic value (1-4Ω) and the diode parameters: 0.95; Matching degree between the control accuracy characteristic value (±0.5dB) and the control circuit accuracy: 0.85.

[0077] Time characteristic matching: Pulse processing capability characteristic (100μs) matching degree with diode recovery time: 0.90; Duty cycle adaptability characteristic (10%) matching degree with heat dissipation design: 0.85; Frequency response characteristic (1-2GHz) matching degree with coupler bandwidth: 0.95; Temperature adaptability characteristic (-40℃~+85℃) matching degree with device operating temperature: 0.90.

[0078] First Mode Coefficient Calculation: Weighted Coefficient Design: Power Feature Weight: 0.3 (most important performance indicator); Temperature Feature Weight: 0.25 (critical safety indicator); Electrical Feature Weight: 0.2 (signal quality indicator); Control Feature Weight: 0.15 (control accuracy indicator); Time Feature Weight: 0.1 (adaptability indicator); Weighted Calculation Process: Power Feature Weighted Value = (0.95 + 0.90 + 0.85 + 0.80) / 4 × 0.3 = 0.2625; Temperature Feature Weighted Value = (0.90 + 0.85 + 0.80 + 0.90) / 4 × 0.25 = 0.21 56; Electrical characteristic weighted value = (0.95+0.90+0.85+0.80) / 4×0.2 = 0.1750; Control characteristic weighted value = (0.95+0.90+0.95+0.85) / 4×0.15 = 0.1406; Time characteristic weighted value = (0.90+0.85+0.95+0.90) / 4×0.1 = 0.0900; First mode coefficient = 0.2625+0.2156+0.1750+0.1406+0.0900 = 0.883; Normalization: First mode coefficient = 0.88 (rounded to two decimal places).

[0079] The second mode coefficient is determined based on multiple limiting features and the usage scenarios of the L-band limiter. Based on the same set of limiting features, and combined with the application requirements and environmental conditions of the usage scenarios, a scenario adaptability evaluation algorithm is designed to match feature values ​​with scenario requirements and calculate the second mode coefficient. The second mode coefficient reflects the degree of adaptability of the limiter to the usage scenarios.

[0080] Specifically, the matching of limiting characteristics with usage scenarios is as follows: Matching with radar application scenarios: Power characteristic value (100W input, 18dBm output) matches radar protection requirements: 0.95; Response time characteristic value (<1μs) matches radar fast protection requirements: 0.90; Pulse processing capability characteristic value (100μs) matches radar pulse characteristics: 0.95; Frequency response characteristic value (1-2GHz) matches radar operating frequency band: 0.95; Matching with environmental conditions: Temperature adaptability characteristic value (-40℃~+85℃) matches operating temperature range: 0.90; Temperature characteristic value (maximum 80℃) matches high-temperature environment adaptability: 0.85; Heat dissipation efficiency characteristic value (85%) matches high-temperature environment heat dissipation requirements: 0.80; Vibration condition adaptability characteristic value (2.5g) matches mechanical environment: 0.85.

[0081] Matching with signal characteristics: Pulse processing capability characteristic (100μs) and pulse width matching degree: 0.95; Duty cycle adaptability characteristic (10%) and duty cycle requirement matching degree: 0.90; Power control accuracy characteristic (±0.5dB) and signal fidelity requirement matching degree: 0.85; Recovery time characteristic (<10μs) and pulse interval matching degree: 0.90; Matching with reliability requirements: Continuous operating time characteristic (>10000 hours) and MTBF requirement matching degree: 0.95; Temperature stability characteristic (±2℃) and long-term stability requirement matching degree: 0.90; Electrical characteristic stability characteristic (±5%) and parameter drift requirement matching degree: 0.85; Anti-aging characteristic (>15 years) and lifespan requirement matching degree: 0.80.

[0082] Second mode coefficient calculation: Scenario weight design: Radar application weight: 0.4 (core application scenario); Environmental condition weight: 0.25 (working environment adaptability); Signal characteristic weight: 0.25 (signal processing capability); Reliability requirement weight: 0.1 (long-term stability); Weighted calculation process: Radar application weighted value = (0.95 + 0.90 + 0.95 + 0.95) / 4 × 0.4 = 0.3750; Environmental condition weighted value = (0.90 + 0.85 + 0.80 + 0.85) / 4 × 0.25 = 0.2125;

[0083] The signal characteristic weighting value = (0.95 + 0.90 + 0.85 + 0.90) / 4 × 0.25 = 0.2250;

[0084] Reliability requirement weighted value = (0.95 + 0.90 + 0.85 + 0.80) / 4 × 0.1 = 0.0875; Second mode coefficient = 0.3750 + 0.2125 + 0.2250 + 0.0875 = 0.9000; Normalization: Second mode coefficient = 0.90 (rounded to two decimal places).

[0085] The limiting mode of the L-band limiter is determined based on the mapping relationship between the first mode coefficient, the second mode coefficient, and the limiting mode. A limiting mode mapping table is introduced to establish the correspondence between the combination of mode coefficients and the limiting mode. The weights and thresholds of the two mode coefficients are considered to determine the final limiting mode. The limiting mode should reflect the working strategy and control method of the limiter. The mode determination should consider dynamic adjustment and adaptive capability.

[0086] Specifically, a clipping mode mapping table is collected, as shown in Table 1:

[0087] Table 1: Limiting Mode Mapping Table

[0088]

[0089] Mode selection logic: If both coefficients are ≥0.9, select the precise adaptive limiting mode; if both coefficients are between 0.8 and 0.9, select the high-power precise limiting mode; if both coefficients are between 0.7 and 0.8, select the medium-power balanced limiting mode; if both coefficients are between 0.6 and 0.7, select the low-power fast limiting mode; if either coefficient is <0.6, select the basic limiting mode; if the two coefficients are not in the same range, select the mode corresponding to the lower coefficient.

[0090] First mode coefficient = 0.88; Second mode coefficient = 0.90; Mode mapping query: First mode coefficient 0.88 falls in the 0.8-0.9 range; Second mode coefficient 0.90 falls in the 0.9-1.0 range; The two coefficients are not in the same range, select the mode corresponding to the lower coefficient; According to the mapping relationship, select "High Power Precise Limiting Mode", mode characteristics: high power processing capability, precise limiting control, good reliability.

[0091] High-power precision limiting mode parameters: Operating power range: 10W-100W; Limiting accuracy: ±0.5dB; Response time: <1μs; Recovery time: <10μs; Temperature control range: -40℃~+85℃; Reliability level: High reliability (MTBF>10000 hours).

[0092] Control Strategy: Detector Circuit Gain: High Gain Mode (ensuring 5V drive voltage); First-Stage Diode Bias: Optimized Bias (for best limiting effect); Subsequent-Stage Diode Control: Dynamic Adjustment (for precise output control); Temperature Protection: Active Heat Dissipation (temperature monitoring and protection). Performance Specifications: Insertion Loss: ≤0.4dB; VSWR: ≤1.5; Limiting Level: ≤20dBm; Power Tolerance: 100W pulse, 100µs pulse width, 10% duty cycle.

[0093] Therefore, based on the traversal of the circuit diagram, the electronic components in the circuit diagram are determined, and the state of each electronic component is marked. The target operating content of the L-band limiter is determined according to the state of each electronic component, and the autonomous control of the limiting mode of the L-band limiter is triggered according to the target operating content. This method is compatible with the overall consideration of the circuit diagram traversal, ensuring the accuracy of the electronic components in the circuit diagram. At the same time, it introduces multi-modal data of the L-band limiter during the operating phase, and is compatible with the overall consideration of multiple limiting features, L-band limiter models and usage scenarios. This improves the accuracy of the limiting mode of the L-band limiter and realizes the autonomous control of the limiting mode of the L-band limiter.

[0094] At this point, a complete circuit layout diagram is obtained from the CAD design file or PCB layout diagram. A graph traversal algorithm (such as depth-first search (DFS) or breadth-first search (BFS)) is used to traverse the entire circuit, identify and record all electronic components, including active devices (such as diodes and transistors) and passive devices (such as resistors, capacitors, and inductors), and record key information such as the model, parameters, location, and connection relationship of each component.

[0095] Specifically, the circuit diagram is as follows: Input terminal: 16dB directional coupler; Model: XC0900A-16S; Parameters: Coupling degree 16dB, insertion loss 0.2dB, VSWR 1.5; Location: at the input port; Connection relationship: the input signal is split into the main path and the coupling path through the coupler;

[0096] Main circuit: First-stage limiting diode; Model: MACOM MA4P604-131; Parameters: withstand voltage 1000V, on-resistance 1, package type is sintered negative terminal; Location: main output terminal of coupler; Connection relationship: receives the main signal of the coupler and outputs it to the subsequent limiting circuit;

[0097] Coupler circuit: Detector circuit; Detector diode: Schottky detector diode; Model: HSCH-9161; Parameters: Detection sensitivity 0.5mV / W, response time <1ns; Location: Coupler output terminal; Connection relationship: Receives the coupled signal from the coupler and outputs the detected voltage;

[0098] Post-stage limiting circuit: Three-stage diode limiting; First stage: CLA4607-000; Parameters: On-resistance 2, transistor assembly; Location: After the first-stage limiting diode; Connection: Receives the signal from the previous stage and performs initial limiting; Second stage: CLA4604-000; Parameters: On-resistance 3, transistor assembly; Location: After CLA4607-000; Connection: Receives the signal from the previous stage and performs further limiting; Third stage: CLA4601-000; Parameters: On-resistance 4, transistor assembly; Location: After CLA4604-000; Connection: Receives the signal from the previous stage and performs fine limiting; Output: Signal transmission area; Location: After CLA4601-000; Connection: Receives the limited signal and outputs it to the post-stage circuit.

[0099] Component status indicators: 16dB directional coupler: Normal operation; Status parameters: Coupling 16.1dB, Insertion loss 0.22dB, VSWR 1.52; Status indicator: Green (Normal); First-stage limiting diode MA4P604-131: Normal operation; Status parameters: Temperature 78°C, On-resistance 1.1mA, Leakage current 0.1mA; Status indicator: Green (Normal); Detector diode HSCH-9161: Normal operation; Status parameters: Detection voltage 2.5V, Response time 0.8ns; Status indicator: Green (Normal); First-stage subsequent limiting diode CLA460 7-000: Normal operation; Status parameters: Temperature 65°C, On-resistance 2.1Ω; Status indicator: Green (Normal); Second stage limiting diode CLA4604-000: Normal operation; Status parameters: Temperature 62°C, On-resistance 3.2Ω; Status indicator: Green (Normal); Third stage limiting diode CLA4601-000: Normal operation; Status parameters: Temperature 60°C, On-resistance 4.1Ω; Status indicator: Green (Normal); Signal transmission area: Normal operation; Status parameters: Output power 18dBm, VSWR 1.48; Status indicator: Green (Normal).

[0100] Based on the fact that all components are in normal condition, the system determines the target operating conditions as follows: maintain the current operating state, continue to execute the high-power precision limiting mode, ensure that the output power is stable at 18dBm, monitor the temperature of all components to prevent overheating, maintain low-loss transmission with insertion loss <0.5dB, maintain good port matching, and VSWR <1.5.

[0101] Based on the target operating conditions, the system automatically triggers the following control actions: maintaining the bias voltage of the MA4P604-131 at its optimal operating point; adjusting the threshold of the detector circuit to ensure accurate input power detection; optimizing the operating status of the CLA series diodes to achieve three levels of precise limiting; monitoring temperature changes in real time and activating heat dissipation control when necessary; continuously monitoring output power and dynamically adjusting the limiting depth; and recording operating parameters to provide data support for subsequent optimization. Simultaneously, with an input 100W pulse signal, the output power stabilizes at 18dBm, the insertion loss remains at 0.4dB (meeting the <0.5dB requirement), the VSWR is maintained at 1.48 (meeting the <1.5 requirement), all diode temperatures are controlled within a safe range, the system response time is <1s (meeting rapid protection requirements), and stable limiting performance is maintained within a 100µs pulse width. Through this detailed circuit traversal, component status marking, target operating condition determination, and autonomous control triggering process, the L-band limiter achieves intelligent operating status management and precise limiting control. This method is particularly suitable for the semi-active limiter structure described in the technical briefing, and can effectively cope with the harsh operating conditions of 100W pulse, 100µs pulse width, and 10% duty cycle, providing reliable protection for the radar receiving system.

[0102] refer to Figure 5 In step S14, the specific steps are as follows:

[0103] S141: Collect the current operating data of each electronic component, determine the overall state corresponding to the circuit diagram based on the current operating data of each electronic component, and determine the limiting range of the L-band limiter according to the overall state corresponding to the circuit diagram and the current operating data of the L-band limiter.

[0104] S142: Collect the limiting mode and corresponding working path of the L-band limiter, determine the limiting distribution gradient map based on the limiting range and limiting mode of the L-band limiter, and determine multiple branch paths based on the limiting distribution gradient map and the working path of the L-band limiter.

[0105] S143: Based on the current working data corresponding to multiple branch paths and the L-band limiter, the primary and secondary limiting paths are determined. At this time, the limiting efficiency of the L-band limiter in the primary limiting path is better than that of the L-band limiter in the primary limiting path.

[0106] In the embodiments of this application, real-time data acquisition is performed on all key electronic components in the circuit diagram, including but not limited to: A4P604-131 PIN diode: forward current, reverse voltage, junction temperature; detector diode: detector output voltage, response time; coupler: coupling degree, isolation degree, input / output power; resistor / capacitor: resistance / capacitance value, temperature, power consumption; control circuit: drive voltage, control signal timing; data acquisition needs to have high time accuracy (such as microsecond level) to ensure that instantaneous changes can be captured under pulse working conditions.

[0107] The collected data from each component is integrated into an "overall circuit distribution diagram status." A status assessment model is established, which can employ: a weighted scoring method (assigning weights to each parameter and calculating a comprehensive score); or machine learning models such as SVM and random forests for classifying status (normal / warning / abnormal). Status classification criteria: Normal state: all parameters are within allowable ranges; Warning state: some parameters are close to critical values; Abnormal state: some parameters exceed thresholds, requiring intervention or protection. Key performance indicators (KPIs) for reference: temperature exceeding 85℃; VSWR greater than 1.5; loss greater than 1dB; limiting response greater than 1μs.

[0108] The limiting range is determined based on the overall status and current operating data. The limiting range refers to the input power interval within which the limiter can effectively operate, including: minimum limiting power (e.g., 0dBm); maximum limiting power (e.g., 100W pulse); limiting depth (e.g., 20dBm); response time (e.g., ≤1μs); and recovery time (e.g., ≤10μs). Based on the current status assessment, the limiting range is dynamically adjusted: if the system is in a normal state, full-range limiting is used; if in a warning state, the limiting range is reduced, and the protection level is increased; if in an abnormal state, protection mode is activated, and the limiter is turned off or bypassed. The limiting range is output in interval representation, such as [0dBm, 100W], with a response time ≤1μs and a limiting depth of 20dBm; a status flag is also output for subsequent control logic.

[0109] Specifically, temperature weight: 30% (75℃ → score 90); VSWR weight: 20% (1.3 → score 95); loss weight: 20% (0.6dB → score 90); response time weight: 30% (0.8μs → score 95); overall score = 90×0.3 + 95×0.2 + 90×0.2 + 95×0.3 = 92.5; score > 90 → normal state.

[0110] Under normal conditions, the limiter can operate in the full range: minimum limiting power: 0dBm; maximum limiting power: 100W (pulse); limiting depth: 20dBm; response time: ≤1μs; recovery time: ≤10μs; output representation: limiting range: [0dBm, 100W]; status flag: NORMAL.

[0111] Furthermore, the limiting modes and corresponding operating paths of the L-band limiter are collected. The limiting mode refers to the control strategy of the limiter under different operating conditions, including: fast response mode: used for sudden high-power signals, emphasizing rapid start-up limiting; low noise mode: used for small signal protection, minimizing insertion loss; high power mode: used for continuous high power input, emphasizing thermal management; adaptive mode: dynamically adjusts the limiting intensity according to the input power. The acquisition methods include: querying the control register or configuration file; reading the mode flag preset by the user or automatically selected by the system; and recording the mode switching conditions (such as power threshold, temperature threshold, etc.).

[0112] The working path refers to the physical / logical path that a signal takes within the limiter, including: main path: the main limiting unit link through which the signal passes; bypass path: the signal bypasses certain units in low power or protection mode; branch path: the signal splitting and combining paths that exist in complex structures; acquisition methods include: reading the circuit topology diagram or the path selection switch status; tracking the signal flow (e.g., through RF probes or coupling monitoring points); and recording path switching events and timestamps.

[0113] The limiting distribution gradient map is determined based on the limiting range and limiting mode. The limiting distribution gradient map is defined as follows: This map describes the spatial distribution of the limiter response intensity at different power levels within the limiting range; Horizontal axis: input power (dBm / W); Vertical axis: limiting depth (dB) or response time (μs); The map may contain multiple curves, each corresponding to a different limiting mode.

[0114] Construction Method: A lookup table (LUT) or mathematical model (such as polynomial fitting) is used; the input is the clipping range (e.g., 0dBm to 100W) and the current clipping mode; the output is the clipping depth, response time, insertion loss, etc., corresponding to each power point; the gradient plot can be calibrated using simulation or measured data. Example Gradient Plot Characteristics: Fast Response Mode: Clipping starts at low power, with a large depth and fast response; Low Noise Mode: Clipping only starts at high power, with a small depth and low insertion loss; High Power Mode: Clipping depth increases slowly with power, emphasizing stability.

[0115] In the gradient graph, different power ranges correspond to different signal processing paths; each branch path represents a combination of signal flows with different limiting characteristics; branch paths include: straight-through paths (no processing); single-stage limiting paths; multi-stage cascaded paths; and composite paths with temperature compensation. Path matching method: Matching is performed between the current working path (e.g., the main path) and the power ranges in the gradient graph; each power range corresponds to one or more candidate branch paths; path selection criteria include: limiting efficiency (depth / speed); thermal safety; insertion loss; and system stability. Output structure: Each branch path includes: path ID (e.g., Path_A, Path_B); applicable power range; limiting depth; response time; and control signal sequence (e.g., switch state).

[0116] Specifically, the L-band limiter operates at a frequency of 1.5 GHz; has a limiting range of 0 dBm to 100 W (pulse); uses a current limiting mode of fast response; and operates on the main path (the signal passes sequentially through the input coupler → MA4P604-131 → CLA4603 → output).

[0117] Limiting Mode: Mode ID: FAST_RESPONSE; Trigger Condition: Input power > 10dBm; Characteristics: Fast start-up, limiting depth ≥ 20dB. Operating Path: Path ID: MAIN_PATH; Path Description: Input → Coupler → MA4P604-131 → CLA4603 → Output; Control Signal Sequence: SW1 = ON, SW2 = OFF.

[0118] A limiting distribution gradient map is constructed, as shown in Table 2:

[0119] Table 2. Amplitude Limitation Distribution Gradient Map

[0120]

[0121]

[0122] The gradient graph curve shows that the system rapidly starts up above 10dBm, consistent with the characteristics of a fast response mode. Based on the gradient graph and the main path, the following branch paths are identified, illustrated in Table 3:

[0123] Table 3 shows the branch path.

[0124]

[0125] The current input power is 25dBm, and the matching branch path is Path_B; the system outputs a set of branch paths: {Path_A,Path_B,Path_C}, for subsequent primary / secondary path selection.

[0126] Therefore, the primary and secondary limiting paths are determined based on the current working data corresponding to multiple branch paths and the L-band limiter. In this case, the limiting efficiency of the L-band limiter in the primary limiting path is better than that of the L-band limiter in the primary limiting path. This approach takes into account the overall consideration of multiple branch paths and the current working data corresponding to the L-band limiter, ensuring the accuracy of the primary and secondary limiting paths.

[0127] At this point, the main limiting path and the secondary limiting path are determined based on multiple branch paths and current working data. Multiple branch paths and their attributes are obtained from S142, including: path ID (such as PathA, PathB, PathC); applicable power range; limiting depth; response time; control signal sequence. Current working data is obtained from S141, including: current input power; temperature, voltage, and current of each electronic component; current limiting mode; and overall circuit status (such as NORMAL, WARNING, OVERLOAD).

[0128] Based on the current input power, suitable branch paths are selected. Each suitable path is comprehensively evaluated, with evaluation metrics including: limiting efficiency (the ratio of limiting depth to response time, the higher the better); thermal safety (whether the temperature of components in the path exceeds a safe threshold); power margin (the difference between the maximum power the path can withstand and the current power); and mode matching (whether the path characteristics are consistent with the current limiting mode). A comprehensive score is calculated for each path, using a weighted scoring method. Primary and secondary paths are determined: the path with the highest comprehensive score is designated as the primary limiting path; the path with the second highest score is designated as the secondary limiting path; ensuring that the limiting efficiency (score) of the primary path is strictly superior to that of the secondary path; if scores are the same, the path with the faster response time is prioritized.

[0129] Limiting efficiency = Limiting depth (dB) / Response time (s); the larger this value, the better the limiting effect achieved per unit time; the definition can be adjusted according to actual needs, such as adding factors like insertion loss and thermal stability. Calculate the limiting efficiency of all candidate paths; after sorting, ensure that the efficiency of the primary path > the efficiency of the secondary path; if not, adjust the evaluation weights or reselect the path. Dynamic adjustment mechanism: When operating conditions change (e.g., sudden power increase, temperature rise): re-evaluate all paths; switch primary and secondary paths if necessary; ensure the switching process is smooth and does not affect signal transmission.

[0130] Specifically, path selection: Current input power 25dBm, applicable paths: PathB, PathC. Calculate clipping efficiency: PathB efficiency = 20dB / 1s = 20dB / s; PathC efficiency = 30dB / 0.8s = 37.5dB / s. Comprehensive evaluation (assuming weights: efficiency 50%, temperature 30%, pattern matching 20%):

[0131] PathB: Efficiency score: 20 / 37.5*50=26.7; Temperature score: 45℃<60℃ threshold, full score 30; Pattern matching: fast response pattern matching, full score 20; Total score: 26.7+30+20=76.7.

[0132] PathC: Efficiency score: 37.5 / 37.5*50=50; Temperature score: 45℃<60℃ threshold, full score 30; Pattern matching: Fast response pattern matching, full score 20; Total score: 50+30+20=100.

[0133] Primary and secondary paths determined: PathC total score 100 > PathB total score 76.7; Primary limiting path: PathC; Secondary limiting path: PathB; Verification efficiency: PathC (37.5dB / s) > PathB (20dB / s), meeting the requirements. Primary path: PathC (SW1OFF, SW2ON); Secondary path: PathB (SW1ON, SW2ON); Switching condition: If temperature > 60℃ or power > 30dBm, switch to PathB.

[0134] refer to Figure 6 In step S15, the specific steps are as follows:

[0135] S151: Collect the current working data of the L-band limiter, determine multiple working combinations of the L-band limiter based on the current working data of the L-band limiter, determine the corresponding sub-working efficiency based on the identification of multiple working combinations of the L-band limiter, and determine the working efficiency of the L-band limiter based on multiple sub-working efficiencies and the model of the L-band limiter.

[0136] S152: Collect the main limiting path and secondary limiting path of the L-band limiter, and determine the first control coefficient based on the working efficiency of the L-band limiter and the matching of the main limiting path of the L-band limiter;

[0137] S153: The second control coefficient is determined based on the working efficiency of the L-band limiter and the matching of the secondary limiting path of the L-band limiter. The limiting control level of the L-band limiter is determined based on the mapping relationship between the first control coefficient, the second control coefficient and the limiting control level.

[0138] In the embodiments of this application, real-time operating data of the L-band limiter is obtained from S141, including: input power, output power, insertion loss; temperature, voltage, and current of each electronic component; current limiting mode (fast response / low noise / high power); and primary / secondary limiting path identifiers. The current operating data is combined according to different dimensions to form multiple operating combinations, such as: power combinations: low power (<10dBm), medium power (10-30dBm), high power (>30dBm); temperature combinations: normal temperature (<40℃), medium temperature (40-60℃), high temperature (>60℃); mode combinations: fast response mode, low noise mode, high power mode; each operating combination represents a specific operating state.

[0139] Determine the sub-operating efficiency: For each operating combination, calculate its sub-operating efficiency using the formula: Sub-operating efficiency = (Output power / Input power) × (1 - Insertion loss) × Temperature correction factor; the temperature correction factor is determined based on the current temperature: room temperature: 1.0; medium temperature: 0.9; high temperature: 0.8. Take a weighted average of all sub-operating efficiencies, with weights determined based on the frequency of each combination; adjust the calculation results by considering the model parameters of the L-band limiter (e.g., the typical efficiency curve of MA4P604-131); finally, obtain the overall operating efficiency of the L-band limiter.

[0140] Specifically, the current operating data is as follows: Input power: 25dBm; Output power: 20dBm; Insertion loss: 2dB; Temperature: 50℃; Limiting mode: Fast response mode. Operating combination classification: Power combination: Medium power (10-30dBm); Temperature combination: Medium temperature (40-60℃); Mode combination: Fast response mode. Sub-operating efficiency calculation: Output / input power ratio: 20 / 25 = 0.8; Insertion loss effect: 1 - 10^(-2 / 10) = 1 - 0.63 = 0.37; Temperature correction factor: 0.9; Sub-operating efficiency = 0.8 × 0.37 × 0.9 = 0.2664 (26.64%).

[0141] Assuming the sub-efficiencies of other combinations are as follows: low power at room temperature: 0.35; high power at high temperature: 0.15; weighted average (assuming a frequency of 33.3%): (0.2664+0.35+0.15) / 3=0.2555 (25.55%); based on the parameters of model MA4P604-131, the typical efficiency curve shows that the efficiency at medium power should be 27%, correction factor = 27 / 25.55=1.057; final operating efficiency = 25.55%×1.057=27% (after correction).

[0142] Furthermore, the primary and secondary limiting paths of the L-band limiter are collected, and the first control coefficient is determined based on the working efficiency of the L-band limiter and the matching of the primary limiting path of the L-band limiter. This takes into account both the working efficiency of the L-band limiter and the matching of the primary limiting path of the L-band limiter, ensuring the accuracy of the first control coefficient.

[0143] At this point, the main limiting path is acquired: the main limiting path is the signal processing path that is currently used first, and it usually has the best limiting efficiency; the acquired content includes: path identifier (such as PathA, PathB, etc.); path configuration parameters (switching status, diode bias voltage, etc.); path characteristic parameters (insertion loss, response time, limiting depth, etc.); path applicable conditions (power range, temperature range, etc.).

[0144] Secondary limiting path acquisition: The secondary limiting path is a backup path, activated when the primary path cannot meet the requirements. The acquisition content is similar to that of the primary path, but focuses on: differences from the primary path; switching conditions (such as temperature thresholds, power thresholds, etc.); and switching delay time. Acquisition methods: Reading the current path configuration via a digital interface; monitoring path status parameters via sensors; and recording path switching history via control logic.

[0145] The first control coefficient is determined based on the working efficiency and the matching of the main limiting path. The current working efficiency (η) is obtained from step S151. The working efficiency range is usually from -100% to 100%, and a negative value indicates unsatisfactory performance. Matching degree evaluation indicators: power matching degree: whether the current input power is within the optimal operating range of the main path; temperature matching degree: whether the current temperature is within the recommended operating range of the main path; mode matching degree: whether the current limiting mode is consistent with the main path design mode; performance matching degree: whether the actual performance of the main path meets the design expectations.

[0146] Specifically, current operating efficiency (η): 45% (obtained from S151); main limiting path: PathA; characteristics: optimal power range: 10-30dBm; optimal temperature range: 20-50℃; design mode: fast response mode; expected insertion loss: <1.5dB; actual operating parameters: input power: 25dBm; operating temperature: 45℃; current mode: fast response mode; actual insertion loss: 1.2dB; power matching: 25dBm within the 10-30dBm range → score 1.0; temperature matching: 45℃ within the 20-50℃ range → score 1.0; mode matching: current mode matches design mode → score Score 1.0; Performance matching degree: Actual loss 1.2dB < expected 1.5dB → Score 1.0; Matching degree calculation: M=(1.0×0.4)+(1.0×0.3)+(1.0×0.2)+(1.0×0.1); M=0.4+0.3+0.2+0.1=1.0; First control coefficient determination: K1=η×M×base coefficient; K1=45%×1.0×1.0=0.45; The first control coefficient is 0.45, indicating: excellent main path matching degree (1.0); good operating efficiency (45%); the overall control coefficient is positive, indicating that the current working status is good; this coefficient will be used for subsequent amplitude limiting control level determination.

[0147] Therefore, a second control coefficient is determined based on the working efficiency of the L-band limiter and the matching of its secondary limiting path. The limiting control level of the L-band limiter is determined based on the mapping relationship between the first control coefficient, the second control coefficient, and the limiting control level. This approach takes into account the overall consideration of the mapping relationship between the first control coefficient, the second control coefficient, and the limiting control level, ensuring the accuracy of the limiting control level of the L-band limiter. At the same time, the introduction of the primary limiting path and the secondary limiting path improves the further control of the L-band limiter. This approach achieves an overall consideration of the working efficiency of the L-band limiter, the primary limiting path, and the secondary limiting path, thereby improving the accuracy of the limiting control level of the L-band limiter.

[0148] At this point, the second control coefficient is determined based on the working efficiency and the matching of the secondary limiting path. The secondary limiting path is a backup path when the primary path fails, and its matching degree with the current working state needs to be evaluated. The evaluation dimensions include: power matching degree: whether the current input power is within the optimal operating range of the secondary path; temperature matching degree: whether the current operating temperature is within the stable operating temperature range of the secondary path; mode matching degree: whether the current operating mode is consistent with the design mode of the secondary path; performance matching degree: whether the actual performance of the secondary path is close to its design performance. The matching degree calculation method is based on a weighted evaluation. The weighting of each dimension is as follows: power matching degree: 40% (0.4); temperature matching degree: 30% (0.3); mode matching degree: 20% (0.2); performance matching degree: 10% (0.1); the matching degree score range for each dimension is 0-1 (1 represents a perfect match, 0 represents a complete mismatch); the formula for calculating the second control coefficient is: K2 = η × M × base coefficient; η: current working efficiency (-100% to 100%); M: secondary path matching degree (0-1); base coefficient: the system's preset adjustment parameter (usually 1.0).

[0149] The limiting control level is determined based on the mapping relationship between the first control coefficient, the second control coefficient, and the limiting control level. The first control coefficient K1 is obtained; the second control coefficient K2 is obtained, and the comprehensive control coefficient is calculated: Kcomprehensive = α × K1 + β × K2; where α and β are weighting coefficients, typically α = 0.7 and β = 0.3 (the main path has a higher weight). A preset mapping relationship table typically contains 5 levels: Level 1 (Emergency Limiting): Kcomprehensive < -0.6; Level 2 (Strong Limiting): -0.6 ≤ Kcomprehensive < -0.2; Level 3 (Regular Limiting): -0.2 ≤ Kcomprehensive < 0.2; Level 4 (Mild Limiting): 0.2 ≤ Kcomprehensive < 0.6; Level 5 (Monitoring Mode): Kcomprehensive ≥ 0.6. Based on the calculated Kcomprehensive value, the mapping relationship table is queried; the corresponding limiting control level is determined; and control commands are output to adjust the limiter's operating status.

[0150] Specifically, Kcomprehensive = 0.7 × K1 + 0.3 × K2; Kcomprehensive = 0.7 × 0.45 + 0.3 × 0.4455; Kcomprehensive = 0.315 + 0.13365 = 0.44865; Kcomprehensive = 0.44865; falls within the range of 0.2 ≤ Kcomprehensive < 0.6; corresponding control level: Level 4 (mild limiting); limiting control level: Level 4; control action: keep the main path PathA working; reduce the limiting depth to -15dB; extend the response time to 50ns; reduce the monitoring frequency to 1kHz; system status assessment: main path matching is good (K1 = 0.45); secondary path matching is excellent (K2 = 0.4455); overall status is good (Kcomprehensive = 0.44865); control strategy: adopt mild limiting mode (Level 4); optimize signal transmission quality while ensuring protection effect; maintain continuous monitoring of secondary paths in case of need to switch.

[0151] Please see Figure 7 , Figure 7 This is a schematic diagram of the structural composition of the control system of the L-band limiter in an embodiment of the present invention; the control system of the L-band limiter includes:

[0152] Working path module 21 is used to determine the working path of the L-band limiter based on the location of the L-band limiter and the corresponding circuit diagram;

[0153] The multimodal data module 22 is used to determine multiple limiting nodes based on the identification of the working path of the L-band limiter, and to determine the multimodal data of the L-band limiter during the working phase based on the limiting data and node positions of the multiple limiting nodes.

[0154] The autonomous control module 23 is used to determine multiple limiting features based on the recognition of the multimodal data, determine the limiting mode of the L-band limiter according to the multiple limiting features, the model of the L-band limiter and the usage scenario, and trigger the autonomous control of the limiting mode of the L-band limiter as the state of the electronic components in the circuit diagram is adjusted.

[0155] The limiting path module 24 is used to determine the limiting range of the L-band limiter based on the current operating data of each electronic component and the current operating data of the L-band limiter in the circuit distribution diagram, and to determine the main limiting path and the secondary limiting path according to the limiting range, limiting mode and corresponding operating path of the L-band limiter.

[0156] The limiting control level module 25 is used to determine the working efficiency of the L-band limiter based on the current working data of the L-band limiter, and to determine the limiting control level of the L-band limiter according to the working efficiency of the L-band limiter, the primary limiting path and the secondary limiting path.

[0157] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A control method of an L-band limiter, characterized by, include: The working path of the L-band limiter is determined based on its location and corresponding circuit diagram. Multiple limiting nodes are identified based on the working path of the L-band limiter, and the multimodal data of the L-band limiter during the working phase is determined based on the limiting data and node positions of the multiple limiting nodes. Based on the identification of this multimodal data, multiple limiting features are determined. The limiting mode of the L-band limiter is determined according to the multiple limiting features, the model of the L-band limiter and the usage scenario. The autonomous control of the limiting mode of the L-band limiter is triggered as the state of the electronic components in the circuit diagram is adjusted. In this circuit diagram, the limiting range of the L-band limiter is determined based on the current operating data of each electronic component and the current operating data of the L-band limiter. The main limiting path and the secondary limiting path are determined according to the limiting range, limiting mode and corresponding operating path of the L-band limiter. The operating efficiency of the L-band limiter is determined based on its current operating data, and the limiting control level of the L-band limiter is determined based on its operating efficiency, the primary limiting path, and the secondary limiting path.

2. The control method of an L-band limiter according to claim 1, wherein The step of determining the operating path of the L-band limiter based on its location and corresponding circuit diagram includes: The location of the L-band limiter is collected, and the corresponding circuit diagram is matched according to the location and model of the L-band limiter. Based on the circuit diagram and the location of the L-band limiter, multiple working areas of the L-band limiter in the circuit diagram are determined. Multiple sub-working paths are determined based on the identification of multiple working areas. The path synthesis method is determined based on the multiple sub-working paths, the location of the L-band limiter, and the working content of the L-band limiter in the circuit distribution diagram. The synthesis of multiple sub-working paths is triggered along the path synthesis method to output the working path of the L-band limiter.

3. The control method of an L-band limiter according to claim 1, wherein The process of identifying multiple limiting nodes based on the operating path of the L-band limiter, and determining the multimodal data of the L-band limiter during its operating phase based on the limiting data and node positions of these multiple limiting nodes, includes: The working path of the L-band limiter is collected, multiple limiting intervals are determined based on the identification of the working path of the L-band limiter, and corresponding limiting nodes are determined based on the location of the multiple limiting intervals and the multiple working areas of the L-band limiter, so as to collect multiple limiting nodes. The system monitors the operation of multiple limiting nodes in real time and collects their limiting data. Based on the filtering of the limiting data from multiple limiting nodes, abnormal limiting nodes are identified and removed. The remaining limiting data and node positions are used to determine the multimodal data of the L-band limiter during its operation. At this point, the multimodal data contains the limiting data of each limiting node and matches the corresponding operating status and node position.

4. The control method of an L-band limiter according to claim 1, wherein The recognition of the multi-modal data determines a plurality of limiting features, the limiting mode of the L-band limiter is determined according to the plurality of limiting features, the model and the use scene of the L-band limiter, and the autonomous control of the limiting mode of the L-band limiter is triggered along with the state adjustment of the electronic elements in the circuit distribution diagram, including: The multi-modal data is collected, and the recognition of the multi-modal data determines a plurality of limiting features, the limiting mode of the L-band limiter is determined according to the plurality of limiting features, the model and the use scene of the L-band limiter, and the autonomous control of the limiting mode of the L-band limiter is triggered along with the state adjustment of the electronic elements in the circuit distribution diagram, including: The model and the use scene of the L-band limiter are collected, the first mode coefficient is determined according to the plurality of limiting features and the model of the L-band limiter, the second mode coefficient is determined according to the plurality of limiting features and the use scene of the L-band limiter, and the limiting mode of the L-band limiter is determined based on the first mode coefficient, the second mode coefficient and the limiting mode mapping relationship.

5. The control method of an L-band limiter according to claim 4, wherein The recognition of the multi-modal data determines a plurality of limiting features, the limiting mode of the L-band limiter is determined according to the plurality of limiting features, the model and the use scene of the L-band limiter, and the autonomous control of the limiting mode of the L-band limiter is triggered along with the state adjustment of the electronic elements in the circuit distribution diagram, including: Based on the traversal of the circuit distribution diagram, the electronic elements in the circuit distribution diagram are determined, and the state of each electronic element is marked, the target work content of the L-band limiter is determined according to the state of each electronic element, and the autonomous control of the limiting mode of the L-band limiter is triggered according to the target work content.

6. The control method of an L-band limiter according to claim 1, wherein In the circuit distribution diagram, the limiting range of the L-band limiter is determined based on the current work data of each electronic element and the current work data of the L-band limiter, and the main limiting path and the secondary limiting path are determined according to the limiting range of the L-band limiter, the limiting mode and the corresponding work path, including: The current work data of each electronic element is collected, the overall state corresponding to the circuit distribution diagram is determined based on the current work data of each electronic element, and the limiting range of the L-band limiter is determined according to the overall state corresponding to the circuit distribution diagram and the current work data of the L-band limiter.

7. The control method of an L-band limiter according to claim 6, wherein In the circuit distribution diagram, the limiting range of the L-band limiter is determined based on the current work data of each electronic element and the current work data of the L-band limiter, and the main limiting path and the secondary limiting path are determined according to the limiting range of the L-band limiter, the limiting mode and the corresponding work path, including: The limiting mode and the corresponding work path of the L-band limiter are collected, the limiting distribution gradient diagram is determined based on the limiting range of the L-band limiter and the limiting mode of the L-band limiter, and a plurality of branch paths are determined based on the limiting distribution gradient diagram and the work path of the L-band limiter; The main limiting path and the secondary limiting path are determined based on the plurality of branch paths and the current work data corresponding to the L-band limiter, and at this time, the limiting efficiency of the L-band limiter in the main limiting path is better than the limiting efficiency of the L-band limiter in the main limiting path.

8. The control method of an L-band limiter according to claim 1, wherein The current working data of the L-band limiter is used to determine the working efficiency of the L-band limiter, and the working efficiency of the L-band limiter is used to determine the limiter control level of the L-band limiter according to the main limiting path and the secondary limiting path, comprising: The current working data of the L-band limiter is collected, the working efficiency of the L-band limiter is determined based on the current working data of the L-band limiter, and the working efficiency of the L-band limiter is determined according to the identification of the multiple working combinations of the L-band limiter.

9. The control method of the L-band limiter according to claim 8, wherein The current working data of the L-band limiter is used to determine the working efficiency of the L-band limiter, and the working efficiency of the L-band limiter is used to determine the limiter control level of the L-band limiter according to the main limiting path and the secondary limiting path, further comprising: The main limiting path and the secondary limiting path of the L-band limiter are collected, and the first control coefficient is determined based on the matching of the working efficiency of the L-band limiter and the main limiting path of the L-band limiter; The second control coefficient is determined based on the matching of the working efficiency of the L-band limiter and the secondary limiting path of the L-band limiter, and the limiter control level of the L-band limiter is determined based on the first control coefficient, the second control coefficient and the mapping relationship of the limiter control level.

10. A control system for an L-band limiter, characterized by The control system of the L-band limiter is applied to the control method of the L-band limiter as claimed in any one of claims 1-9, and the control system of the L-band limiter comprises: The working path module is used to determine the working path of the L-band limiter according to the position of the L-band limiter and the corresponding circuit distribution diagram; The abnormal image module is used to determine multiple limiting nodes according to the identification of the working path of the L-band limiter, and to determine the multi-modal data of the L-band limiter in the working stage according to the limiting data and node position of the multiple limiting nodes; The autonomous control module is used to determine multiple limiting features based on the identification of the multi-modal data, to determine the limiting mode of the L-band limiter according to the multiple limiting features, the model of the L-band limiter and the use scene, and to trigger the autonomous control of the limiting mode of the L-band limiter along with the state adjustment of the electronic elements in the circuit distribution diagram; The limiting path module is used to determine the limiting range of the L-band limiter based on the current working data of each electronic element and the current working data of the L-band limiter in the circuit distribution diagram, and to determine the main limiting path and the secondary limiting path according to the limiting range of the L-band limiter, the limiting mode and the corresponding working path; The limiter control level module is used to determine the working efficiency of the L-band limiter based on the current working data of the L-band limiter, and to determine the limiter control level of the L-band limiter according to the working efficiency of the L-band limiter, the main limiting path and the secondary limiting path.

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