Anti-mutual interference method for multiple self-defense jammers

Abstract

The invention discloses an anti-mutual-interference method for multiple self-defense jammers, and the method comprises the steps: carrying out the channel polling scanning stage of an interfered independent channel, fixing the channel after receiving an intercepted signal, and improving a threat signal sign; then, selecting a corresponding jammer to carry out a detection stage according to the intercepted signal, and sending a suppression signal; and after the threat signal disappears, quitting from the detection stage, and sending a suppression release signal to each interference extension set to enable each extension set to enter the channel polling scanning stage again, so that one-time mutual interference time sequence output is completed, the system complexity is low, and under the condition of dense multiple targets, the reaction time is shortened, and the real-time performance of interference is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic countermeasures, and in particular to an anti-mutual interference method for multiple self-defense jammers. Background Art

[0002] To achieve 360-degree airspace coverage, multiple jammers must be deployed at the site. However, these jammers operate with consistent parameters, so an incoming target could trigger two or more jammers. During the jamming process, another jammer could trigger another jammer, causing interference chaos. Traditional friend-or-foe identification systems consist of an interrogator and a transponder. They obtain identification information through a question-and-answer process. When the radar detects a target, the interrogator sends an interrogation signal. If the target is friendly, the interrogator decodes the interrogation signal and responds. If the target is enemy, the interrogator fails to receive the response, effectively distinguishing friend from foe. However, these systems require independent interrogators and transponders, as well as data encoding and decoding. In densely populated environments with multiple targets, response times are long, resulting in poor real-time jamming. Summary of the Invention

[0003] The main purpose of the present invention is to provide an anti-mutual interference method for multiple self-defense jammers, aiming to solve the problems of long reaction time and poor interference real-time performance of traditional friend-or-foe identification systems in the case of dense multi-targets.

[0004] In order to achieve the above object, the present invention proposes a method for anti-interference of multiple self-defense jammers, the anti-interference method of multiple self-defense jammers comprising: Receive intercepted signals during the channel polling scan phase; Selecting a corresponding jammer according to the intercepted signal to enter the detection phase and send a suppression signal; After the detection is completed, the detection phase is exited, and the suppression release signal is sent, and the channel polling scanning phase is re-entered.

[0005] In one embodiment, the specific steps of selecting a corresponding jammer according to the intercepted signal to enter the reconnaissance phase are: Remaining when determining that the channel receiving the intercepted signal is a non-suppressed channel; The amplitude values of the intercepted signals are compared to obtain the intercepted signal with the maximum amplitude value, and the jammer that receives the intercepted signal with the maximum amplitude value is selected to enter the detection and interference phase.

[0006] In one embodiment, the specific steps of comparing the amplitude values of the intercepted signals are: If the resident extension is an interfering host, the resident extension receives amplitude signals from multiple interfering extensions, compares the amplitude signals, and sends the amplitude comparison result back to the corresponding interfering extension; If the resident extension is not the interfering host, the resident extension sends an amplitude signal to the interfering host and receives an amplitude comparison result sent back by the interfering host.

[0007] In one embodiment, the anti-mutual interference method of multiple self-defense jammers further includes: setting a delay for the suppression signal.

[0008] In one embodiment, the anti-mutual interference method of multiple self-defense jammers further includes: in the reconnaissance phase, the priority interference window sends the interference signal, and the reconnaissance window responds in order.

[0009] In one embodiment, the specific steps of the reconnaissance windows responding in sequence are: First confirm whether the interfering extension is within the interference window. If so, continue to send the interference signal; Then confirm whether the interfering extension is in the reconnaissance window. If so, continue receiving in this reconnaissance window.

[0010] The technical solution of the present invention first performs a channel polling scanning phase on the independent channel of interference. When an intercepted signal is received, the channel is fixed and the threat signal flag is increased. Then, the corresponding jammer is selected according to the intercepted signal to perform a detection phase and a suppression signal is sent. Until the threat signal disappears, the detection phase is exited and a suppression release signal is sent to each interference extension, so that each extension re-enters the channel polling scanning phase, thereby completing the output of a mutual interference timing sequence. The system has low complexity, shortens the reaction time in the case of dense multi-targets, and improves the real-time performance of interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of the flow of the anti-interference method of the multi-self-defense jammer of the present invention; Figure 2 It is a logic flow chart of the anti-interference method of the multi-self-defense jammer of the present invention; Figure 3 This is a small signal mutual interference timing analysis diagram of the anti-interference method of the multi-self-defense jammer of the present invention; Figure 4 This is a timing analysis diagram of large signal mutual interference of the anti-interference method of the multi-self-defense jammer of the present invention; Figure 5 This is a bus suppression signal diagram of the anti-interference method of the multi-self-defense jammer of the present invention; Figure 6 It is a multi-signal suppression timing diagram of the anti-interference method of the multi-self-defense jammer of the present invention; Figure 7 This is a mutual interference timing simulation diagram of the anti-mutual interference method of the multiple self-defense jammers of the present invention. DETAILED DESCRIPTION

[0012] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the embodiments of the present invention. It should be understood that the described embodiments are only a portion of the embodiments of the present invention, not all of them. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

[0013] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0014] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0015] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0016] Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0017] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, terms such as "disposed" and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also mean internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0018] The traditional friend-or-foe identification system consists of two parts: an interrogator and a transponder. It obtains identification information through a question-and-answer method. That is, when the radar detects a target, the interrogator will send a set of interrogation signals to the target. If the target is friendly, the interrogator will decode the interrogation information and respond. If the target is enemy, the interrogator will not receive the response information, thereby clearly distinguishing friend from foe. Since independent interrogators and transponders are required, and data encoding and decoding are required, the response time is long in the case of dense multi-targets, resulting in poor real-time interference.

[0019] In order to solve the above problems, the present invention proposes an anti-mutual interference method for multiple self-defense jammers. The specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0020] like Figure 1-7 As shown, the anti-interference methods of multiple self-defense jammers include: Receive intercepted signals during the channel polling scan phase; Selecting a corresponding jammer according to the intercepted signal to enter the detection phase and send a suppression signal; After the detection is completed, the detection phase is exited, and the suppression release signal is sent, and the channel polling scanning phase is re-entered.

[0021] In one embodiment, the specific steps of selecting a corresponding jammer according to the intercepted signal to enter the reconnaissance phase are: Remaining when determining that the channel receiving the intercepted signal is a non-suppressed channel; The amplitude values of the intercepted signals are compared to obtain the intercepted signal with the maximum amplitude value, and the jammer that receives the intercepted signal with the maximum amplitude value is selected to enter the detection and interference phase.

[0022] In one embodiment, the specific steps of comparing the amplitude values of the intercepted signals are: If the resident extension is an interfering host, the resident extension receives amplitude signals from multiple interfering extensions, compares the amplitude signals, and sends the amplitude comparison result back to the corresponding interfering extension; If the resident extension is not the interfering host, the resident extension sends an amplitude signal to the interfering host and receives an amplitude comparison result sent back by the interfering host.

[0023] The anti-mutual interference method of the multi-self-defense jammer of the present invention first performs a channel polling scanning stage on the independent channel of interference. When an intercepted signal is received, the channel is fixed and the threat signal flag is increased. Then, the corresponding jammer is selected according to the intercepted signal to perform a detection stage and send a suppression signal. Until the threat signal disappears, the detection stage is exited, and a suppression release signal is sent to each interference extension, so that each extension re-enters the channel polling scanning stage, thereby completing the output of a mutual interference time sequence. The system has low complexity, shortens the reaction time in the case of dense multi-targets, and improves the real-time performance of the interference.

[0024] This embodiment establishes a synchronous communication mechanism in two or more interfering extensions so that the alarm interference status between the interfering extensions can be communicated to prevent mutual interference; that is, when two interfering extensions work at the same time, one interfering extension cannot alarm or interfere with the interference signal of another interfering extension; the conventional reconnaissance and interference functions of the two interfering extensions cannot be affected or the impact can be ignored; a single interfering extension can realize all functions normally, and there is no problem in the indicator test.

[0025] Specifically, first, after the synchronous suppression is triggered, the other interfering extension cannot receive the transmission signal of the interfering extension. In the case of interference window suppression, it is sufficient to ensure that the other interfering extension must be suppressed in the time slot when each interfering signal is emitted; then, the amplitude is corrected after the suppression execution operation. With the interference host as the core, the intercept-first-interference method is adopted. After the interference is established, a special mechanism is designed to perform amplitude comparison in the reconnaissance window of the current signal to confirm that this signal belongs to the interfering extension; finally, the suppression cancellation operation, that is, combined with the above-mentioned suppression execution operation, when the suppression cancellation instruction is received, ad_valid is pulled high. Attention should be paid to other high and low situations of ad_valid to avoid conflicts.

[0026] Among them, the two interfering extensions cannot maintain synchronization during the scanning phase, and there will inevitably be problems with receiving in sequence: Small signal mutual interference is as follows Figure 3 As shown, only the alarm extension sends out interference, no dual target is established, and the other extension does not alarm or interfere; in the case of small signals, the alarm extension without signal is always in the polling scan state, and the interference signal of the extension with signal must be accompanied by the interference window suppression signal, that is, it will not alarm or interfere with the interference signal; in the reconnaissance window, the suppression signal is converted into amplitude comparison start and amplitude comparison end instructions. At this time, there is an amplitude comparison requirement in the window, and a special amplitude comparison operation needs to be entered. Since the small signal is not enough to make extension II alarm, the returned amplitude comparison data must be smaller than the interference extension, and the logical flow is normal.

[0027] Large signal mutual interference is as follows Figure 4As shown, only the extension with large amplitude sends interference, no dual target is established, and the other extension does not alarm or interfere; in the case of large signal, since the scanning logic of the two extensions is not synchronized, there is a time difference in intercepting the signal between the extensions, and the sending logic of the code level suppression signal of the two extensions is consistent, that is, the sending suppression is suppressed before the interference window, and the sending suppression is cancelled after the interference window. Assume that extension I is the interference host and it is the core of mutual interference control. Consider the case where extension I receives the signal first: 1. Simultaneous interception (or almost simultaneous interception), the first interference window suppression sending moment is aligned with the interference or reconnaissance window of the other extension: in this case In this case, without additional mechanisms, the master and slave devices will send suppression signals to each other during the interference window. If the transmit and receive logic are absolutely aligned, they will not receive interference signals from the other extension, but will send a comparison request signal during the reconnaissance period. In the case of low-signal signals, this comparison request should be an independent insertion process, making it difficult for the extension performing the comparison to properly track the interference process. If the transmit and receive timings are staggered, the interference window will align with the reconnaissance window of the other extension, disrupting the working status of both extensions. This is unacceptable and should be avoided in logic design. Second, if the interception time difference is greater than approximately 2ms, the first interference window suppression is sent during the direction selection and dwell phase of the other extension. In this case, after the interference window suppression takes effect, the RF_CODE must be the same. The suppressed extension will only receive N-times periodic signals during the reconnaissance window during the direction selection phase, resulting in a signal-free exit during the dwell phase. Avoid suppression interactions during the bus establishment phase.

[0028] In summary, when the signal is a large target, regardless of the size of the interception time difference or the order of the extensions, it is not enough to only use the interference window suppression method. This may easily affect the bus establishment phase of a certain extension, or cause mutual suppression of the same signal by two extensions. In this embodiment, a synchronization instruction is added at the time of bus establishment completion to inform the other extension that the bus establishment of this target has been completed. At this time, the extension that receives the instruction needs to interrupt the resident (bus) process and exit to the polling scan phase.

[0029] In one embodiment, the anti-mutual interference method of multiple self-defense jammers further includes: setting a delay for the suppression signal.

[0030] In this embodiment, by sending a suppression signal to other interfering extensions, the residence phase is extended at the start moment for intercepting the signal. After confirming the signal, it first checks whether the bus is in a suppressed state. If it is not suppressed, a suppression signal is sent to the other interfering extension, the residence process continues, and the interference is normally transferred. If it is suppressed, the residence process is jumped out, the bus data is cleared, and the channel polling scanning phase is exited until the first interference window suppression signal is received, and the bus suppression state is unlocked. In order to avoid the situation where the bus establishment is completely synchronized and the two interfering extensions send at the same time, the bus suppression signal of the interfering extension should be slightly increased by a certain delay. According to the scanning logic, for the same signal, the time difference of establishing the bus is discrete. When in the same channel window, the two interfering extensions are almost simultaneous. When in different channel windows, the difference is always a multiple of the length of the single channel window, that is, n*150us. Therefore, the delay is set at the order of 10~20us to ensure that the interfering host in the same channel window has priority, and different channel windows are first come first served. On this basis, the interfering host needs to add protection. After it sends the bus suppression status itself, it will not execute the bus suppression operation from the interfering extension before sending the interference window suppression, to ensure that the interfering host takes priority in the event of a conflict.

[0031] In one embodiment, the anti-mutual interference method of multiple self-defense jammers further includes: in the reconnaissance phase, the priority interference window sends the interference signal, and the reconnaissance window responds in order.

[0032] In one embodiment, the specific steps of the reconnaissance windows responding in sequence are: First confirm whether the interfering extension is within the interference window. If so, continue to send the interference signal; Then confirm whether the interfering extension is in the reconnaissance window. If so, continue receiving in this reconnaissance window.

[0033] In one embodiment, the anti-interference method of multiple self-defense jammers further includes: During the reconnaissance window comparison, if it is the time to interfere, then the current comparison will be skipped and the interference phase will begin. If it is the time to be reconnaissanced, the current comparison will be skipped, the reconnaissance window comparison will be sent and the reconnaissance will be completed.

[0034] In this embodiment, after the single-target interference is established and stabilized, the equipment operating status is: the interfering extension continues to receive and transmit interference and sends interference window suppression signals and amplitude comparison signals, the non-interfering extension is in a polling scanning state, and when receiving the amplitude comparison signal, the amplitude comparison process is inserted and replied, and no signal of stable interference will be received throughout the process; different multiple interfering extensions alarm interference on the signal on their respective sides, and finally execute multiple different single targets.

[0035] Figure 6This is a timing analysis diagram of multi-signal suppression under low-signal conditions. After receiving the signal, Extension II initiates bus suppression. Extension I then executes the bus suppression process for the single-target interference state, entering the dual-extension single-target interference state. After amplitude comparison, no handover occurs. Under high-signal conditions, the same distinction is made between the interfering extension and the non-interfering extension. Both Extensions I and II receive the signal and determine whether to handover after amplitude comparison.

[0036] After entering the dual-extension single-target interference, the two extensions send interference window suppression and reconnaissance window amplitude ratio to each other. The analysis is as follows: Interference window suppression overlaps with reconnaissance window amplitude ratio: the reconnaissance window amplitude ratio response needs to switch to the corresponding channel for reception, so the interference will be interrupted; when the interference window is suppressed, the interference is being sent. For signals of different frequencies, if the reconnaissance window performs suppression operations, the query channels are different, ad_valid will not be pulled down, and its normal reconnaissance will not be affected. For signals of the same frequency, no signal can be received after ad_valid is pulled down, or an incomplete signal is received. After this reconnaissance cycle is skipped, it will continue to Continue to press the bus reconnaissance button until the signal is received and then re-enter the transmit and receive sequence. In this case, the reconnaissance window amplitude comparison cannot respond, but the interference window suppression can respond; reconnaissance window amplitude comparison overlap: in different frequency states, the reconnaissance window amplitude comparison will require the other party to switch to the frequency band of its own signal for amplitude measurement. If it is executed normally, its own signal in this cycle will be lost; in the same frequency state, the amplitude comparison data will be disturbed to the larger one in the same frequency signal. The ideal situation is that both extensions do not execute amplitude comparison and each completes the reconnaissance window reception, or one extension conducts reconnaissance and executes sending amplitude comparison, while the other extension executes amplitude comparison and abandons reconnaissance.

[0037] In summary, the principle for suppressing the overlap of signals from two interfering extensions at the interpulse level is as follows: the interference window always takes priority. That is, no matter what the circumstances, upon receiving the interference window suppression signal, the ad_valid signal is always pulled down after the comparison channel. No matter what the circumstances, upon reaching the time when interference should be transmitted, the interference window suppression signal is always transmitted and interference is initiated. The response of the reconnaissance window should be based on a sequential order. Upon receiving the reconnaissance window amplitude comparison, the first step is to confirm whether the system is within the interference transmission period. If so, the reconnaissance window amplitude comparison is not executed and interference continues. The second step is to confirm whether the system is within the reconnaissance window. If so, the amplitude comparison is not executed and the reconnaissance window is completed normally. During the reconnaissance window amplitude comparison, if the time for interference has arrived, the amplitude comparison is skipped and interference is directly initiated. If the time for reconnaissance has arrived, the amplitude comparison is skipped and the reconnaissance window amplitude comparison is sent to complete the reconnaissance.

[0038] The anti-mutual interference method of multiple self-defense jammers in the present invention first scans the independent channels of each jammer. When a signal is received, the channel is fixed, the threat signal flag iMenace_signal_valid is raised, and then the respective signal amplitude values are sent to each other. After the comparison is completed, the interfering extension is determined. The interfering extension with a small amplitude automatically exits the interference process and closes the AD receiving channel; at the same time, the interfering extension with a large amplitude enters the detection stage and initiates a suppression signal until the threat signal disappears, and then sends a suppression release signal to the interfering extension. When the interfering extension receives the suppression release signal, it switches to the normal channel scanning mode, completing the output of the mutual interference timing sequence.

[0039] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for preventing mutual interference of multiple self-defense jammers, characterized in that: The anti-mutual interference method of the multiple self-defense jammers includes: Receive intercepted signals during the channel polling scan phase; Selecting a corresponding jammer according to the intercepted signal to enter the detection phase and send a suppression signal; After the detection is completed, the detection phase is exited, and the suppression release signal is sent, and the channel polling scanning phase is re-entered.

2. The anti-interference method of multiple self-defense jammers according to claim 1 is characterized in that: The specific steps of selecting the corresponding jammer according to the intercepted signal to enter the detection phase are: Remaining when determining that the channel receiving the intercepted signal is a non-suppressed channel; The amplitude values of the intercepted signals are compared to obtain the intercepted signal with the maximum amplitude value, and the jammer that receives the intercepted signal with the maximum amplitude value is selected to enter the detection and interference phase.

3. The anti-interference method of multiple self-defense jammers according to claim 2 is characterized in that: The specific steps of comparing the amplitude values of the intercepted signals are: If the resident extension is an interfering host, the resident extension receives amplitude signals from multiple interfering extensions, compares the amplitude signals, and sends the amplitude comparison result back to the corresponding interfering extension; If the resident extension is not the interfering host, the resident extension sends an amplitude signal to the interfering host and receives an amplitude comparison result sent back by the interfering host.

4. The anti-interference method of multiple self-defense jammers according to claim 1, characterized in that: The anti-mutual interference method of multiple self-defense jammers also includes: setting a delay for the suppression signal.

5. The anti-interference method of multiple self-defense jammers according to claim 1 is characterized in that: The anti-mutual interference method of the multiple self-defense jammers further includes: in the reconnaissance phase, the priority interference window sends the interference signal, and the reconnaissance window responds in order.

6. The anti-interference method of multiple self-defense jammers according to claim 5, characterized in that: The specific steps of the reconnaissance window responding in sequence are: First confirm whether the interfering extension is within the interference window. If so, continue to send the interference signal; Then confirm whether the interfering extension is in the reconnaissance window. If so, continue receiving in this reconnaissance window.

7. The anti-interference method of multiple self-defense jammers according to claim 6 is characterized in that: The anti-interference method of the multiple self-defense jammers also includes: During the reconnaissance window comparison, if it is the time to interfere, then the current comparison will be skipped and the interference phase will begin. If it is the time to be reconnaissanced, the current comparison will be skipped, the reconnaissance window comparison will be sent and the reconnaissance will be completed.

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