Digital channelization filtering electromagnetic compatibility management and control method

Abstract

The invention belongs to the technical field of electronic system engineering, and discloses a digital channelized filtering electromagnetic compatibility management and control method. The invention provides a digital channelized filtering electromagnetic compatibility management and control method aiming at the situation that the interception probability of reconnaissance equipment is reduced by electromagnetic time domain management and control of a multi-sensor integrated system. According to the method, digital channelization filtering of a reconnaissance broadband receiver is used for filtering signals of transmitting frequency points of electromagnetic transmitting equipment in real time or limiting the frequency points of the electromagnetic transmitting equipment according to a channel where a high-value radiation source target is located, so that receiving / transmitting influences between equipment in a system are reduced; and the signal interception probability of the reconnaissance equipment in the multi-sensor integrated system is improved.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of electronic system engineering, and in particular to a digital channelized filtering electromagnetic compatibility control method. Background Art

[0002] With the rapid development of surface ships, the types, quantity and radiation power of shipborne electronic equipment are also increasing. Under the premise of the trend of antenna aperture integration, the number of antennas is still large, and it is becoming increasingly difficult to achieve spatial isolation. The performance of electromagnetic compatibility control directly affects the combat effectiveness of ships and even determines the outcome of a naval battle. In particular, the control issues between radar and weapon systems and between radar and electronic reconnaissance systems.

[0003] At present, the electromagnetic compatibility control measures taken by surface ships are mainly from four aspects: airspace, energy domain, time domain and frequency domain. Airspace control is mainly aimed at continuous wave or high repetition frequency co-frequency interference, and the working frequency band of the interfered equipment is too narrow to implement frequency domain management and time domain management. Airspace control can guide the antenna distribution design and the structural design of the island of the ship during the design stage of surface ships. Energy domain control is aimed at equipment with controllable radiation power, mainly to ensure the safety of shipborne weapons. When the power is reduced, the performance of the equipment also decreases, such as the detection distance of radar and communication. Frequency domain control refers to the control method of staggering the working carrier frequency of mutually interfering equipment according to the controlled characteristics of electromagnetic receiving / transmitting equipment, so that the mutual interference of equipment disappears or weakens. The essence of time domain control is to separate the transmission signals of each device (or the receiving signals of the receiver) in the time domain, so as to achieve the purpose of suppressing mutual interference. For example, when the warning radar is transmitting, the "stealth signal" is used to prevent the co-frequency reconnaissance equipment from receiving external radiation signals or adopting a low-sensitivity working mode. For reconnaissance equipment, frequent "stealth signals" with a large duty cycle will shorten the effective working time of the reconnaissance equipment and greatly reduce the probability of reconnaissance and interception of the equipment.

[0004] Channelization is a method of dividing the receiver bandwidth into several sub-channels and detecting and analyzing the output of each sub-channel to determine whether the signal exists and measure parameters. Channelized receivers have large instantaneous bandwidth and good spectrum resolution, and play an important role in the design of radar reconnaissance receivers. Digital channelization can be regarded as a digital filter bank, which has greater processing flexibility. Summary of the invention

[0005] In view of the situation that the electromagnetic time-domain control of the multi-sensor integrated system reduces the interception probability of the reconnaissance equipment, a digital channelized filtering electromagnetic compatibility control method is proposed. This method uses the digital channelized filtering of the reconnaissance wideband receiver to filter the signals of the emission frequency points of the electromagnetic emission equipment in real time or limit the frequency points of the electromagnetic emission equipment according to the channels where the high-value radiation source targets are located, so as to reduce the receive / transmit influence between the devices in the system and improve the signal interception probability of the reconnaissance equipment in the multi-sensor integrated system.

[0006] To achieve the above object, the present invention provides a digital channelized filtering electromagnetic compatibility control method, including the following steps: Step 1: Use a filtering electromagnetic compatibility control system, which includes an electromagnetic control module, an electromagnetic emission module, and a reconnaissance module. There is an instruction transmission channel between the electromagnetic control module and the electromagnetic emission module and the reconnaissance module; Step 2: The electromagnetic emission module and the reconnaissance module report their working states to the electromagnetic control module, and the electromagnetic control module determines whether control is required; Step 3: If no control is required, the electromagnetic control module issues a control cancellation instruction to the electromagnetic emission module and the reconnaissance module. After receiving the control cancellation instruction, the reconnaissance module turns on the sub-channel; After receiving the control cancellation instruction, the electromagnetic emission module stops frequency avoidance; Step 4: If control is required, the electromagnetic control module generates a control instruction according to the reported working state and the pre-set control logic, and issues it to the electromagnetic emission module and the reconnaissance module; Step 5: When the electromagnetic emission module performs frequency avoidance, after receiving the control instruction, the electromagnetic emission module avoids the corresponding sub-channel or stops transmitting according to the working frequency point of the control instruction; When the reconnaissance module performs frequency avoidance, after receiving the control instruction, the reconnaissance module closes the corresponding sub-channel according to the working frequency point of the control instruction.

[0007] Further, it also includes Step 6: Detect and analyze the PDW and EDW after closing the corresponding sub-channel.

[0008] Further, it also includes Step 7: The reconnaissance module sends the PDW and EDW obtained from the detection and analysis after closing the corresponding sub-channel to the display device for display.

[0009] Further, the working states reported in Step 2 include the working mode and the working frequency band, and the working mode includes active detection and passive reconnaissance.

[0010] Further, Step 2 also includes reporting the working frequency point in real time through the real-time transmission channel and the transmit / receive timing, and the transmit / receive timing includes the transmit control timing pulse and the receive control timing pulse.

[0011] Further, the situation that does not require control in step 3 includes that after the working states reported by the electromagnetic emission module and the reconnaissance module change, the electromagnetic control module determines to cancel the control of the reconnaissance module and the electromagnetic emission module.

[0012] Further, in step 3, after receiving the control cancellation instruction, the reconnaissance module turns on the sub-channels that have been closed; After receiving the control cancellation instruction, the electromagnetic emission module stops the frequency avoidance control frequency range.

[0013] Further, in step 4, the control instruction includes the controlled module, the control frequency range and the control timing sequence.

[0014] Further, in step 5, when the electromagnetic emission module performs frequency avoidance, after receiving the control instruction, the electromagnetic emission module avoids the corresponding sub-channels according to the working frequency point of the control instruction or stops transmitting; When the reconnaissance module performs frequency avoidance, after receiving the control instruction, according to the control frequency range in the control instruction it calculates the sub-channels that need to be closed by digital channelized filtering, that is, when is satisfied, filter channels need to be closed. Wherein represents the minimum in-band frequency of the th sub-channel, represents the maximum in-band frequency of the th sub-channel.

[0015] Beneficial effects: The present invention provides a digital channelized filtering electromagnetic compatibility control method. In the past, the "shadow signal" method was usually used to perform electromagnetic control on reconnaissance equipment. When the electromagnetic emission equipment is in a continuous wave or high pulse repetition frequency working mode, the effective working time of the reconnaissance equipment is compressed, and the signal interception probability is greatly reduced. Moreover, because the working time is "sliced" by the emission timing sequence of the electromagnetic emission equipment, the signal reception is incomplete, resulting in missed detections and misdetections during detection and analysis, which is not conducive to accurately grasping the air situation.

[0016] In contrast, through status reporting and instruction control of electromagnetic control equipment (or software), the present invention transmits the controlled frequency points and time sequences in real time to the reconnaissance equipment and electromagnetic emission equipment. The reconnaissance equipment selects to close the corresponding digital channelized filter channels according to the control command, so that the signals of the electromagnetic emission equipment will not enter the detection and analysis stage, thereby ensuring the integrity and continuity of the effective working time of the reconnaissance equipment and improving the signal interception probability of the reconnaissance equipment for signals in other frequency bands. At the same time, for high-value radiation source targets, the electromagnetic emission equipment can avoid the frequency bands of the channels where the high-value targets are located in real time, ensuring the stable reconnaissance of high-value radiation source targets and enhancing the compatible working ability of multi-sensor integrated equipment. The present invention is applicable to electromagnetic emission equipment with high pulse repetition frequency and frequency agility and reconnaissance equipment adopting digital channelized filtering working mode, and is of great significance for improving the signal interception probability and sorting correctness of reconnaissance equipment under electromagnetic control conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic block diagram of the digital channelized filtering electromagnetic compatibility control technology according to an embodiment of the present invention; Figure 2 is a schematic diagram of digital channelization according to an embodiment of the present invention; Figure 3 is a flowchart of the digital channelized filtering electromagnetic compatibility control method according to an embodiment of the present invention; Figure 4 is a list diagram of radiation source information of a reconnaissance equipment without electromagnetic control measures according to an embodiment of the present invention; Figure 5 is a list diagram of radiation source information of a reconnaissance equipment adopting multi-digital channelized filtering electromagnetic compatibility control measures according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following further describes the preferred mechanisms and implementation methods of the present invention in conjunction with the drawings and specific embodiments.

[0019] As Figures 1 - 5 shown, the present invention discloses a digital channelized filtering electromagnetic compatibility control method. Embodiment 1

[0020] Figure 1 is a schematic block diagram of the digital channelized filtering electromagnetic compatibility control technology according to an embodiment of the present invention; Figure 2 is a schematic diagram of digital channelization according to an embodiment of the present invention; Figure 3 is a flowchart of the digital channelized filtering electromagnetic compatibility control method according to an embodiment of the present invention.

[0021] The core of the present invention lies in that the reconnaissance equipment adopts a digital signal filtering working mode, and there is an instruction transmission channel between the electromagnetic control module (or software) inside the multi-sensor integrated equipment and each module, which can collect states, generate control logics, and issue control commands. The specific technical solutions are as follows: (1) Each device in the multi-sensor integrated system reports its working state to the electromagnetic control device. The reported working state includes the working mode (such as active detection, passive reconnaissance, etc.), working frequency band, and at the same time, the working frequency points are reported in real time through a high-speed transmission channel , transmission / reception timing (such as transmission control timing pulse, reception control timing pulse), etc.; (2) The electromagnetic control device (or software) generates control instructions based on the reported device working state and the pre-set control logic, and issues them to the specified device. The content of the control instructions includes the controlled device, the controlled frequency point range , control timing, etc.; (3) According to the control logic, when the reconnaissance equipment performs frequency avoidance, after receiving the control instruction, the reconnaissance equipment calculates the sub-channels that need to be closed for digital channelized filtering based on the controlled frequency point range in the control instruction, that is, when satisfying , the corresponding filter channels need to be closed. represents the minimum in-band frequency of the th sub-channel, represents the maximum in-band frequency of the th sub-channel; when the electromagnetic emission equipment performs avoidance, after receiving the control instruction, the electromagnetic emission equipment avoids the corresponding sub-channels according to the working frequency point in the control instruction ; (4) The reconnaissance equipment sends the PDW and EDW obtained by detection and analysis after closing the corresponding filtering sub-channels to the display device for display; (5) After the working mode or working frequency point of each device in the multi-sensor integrated system changes, after the electromagnetic control device (or software) determines to cancel (or update) the control of the reconnaissance equipment, it issues a control cancellation (or update instruction) command to the reconnaissance equipment and the electromagnetic emission equipment; (6) After receiving the control cancellation command, the reconnaissance equipment releases the closed filter sub-channels (or updates the controlled filter sub-channels); after receiving the control cancellation instruction, the electromagnetic emission equipment stops avoiding (or updates the frequency point limit range). Embodiment 2

[0022] Taking the control between a certain marine reconnaissance equipment and a navigation radar as an example, the specific embodiments are as follows: (1) The operating frequency point of the navigation radar is 9.410 GHz, and the receiving frequency range of the reconnaissance equipment covers the operating range of the navigation radar; (2) When the electromagnetic control measures are not enabled, there are signals of the navigation radar in the EDW sorted by the reconnaissance equipment, as Figure 4 shown; (3) After control, the electromagnetic control equipment sends control instructions and timing to the reconnaissance equipment, and the control frequency range is 9.410 ± 0.03 GHz; (4) After receiving the control command, the reconnaissance equipment accurately closes two sub-channels corresponding to the center frequencies of 9.36 GHz and 9.42 GHz according to the timing, and the broadband of each filter sub-channel is 60 MHz; (5) After enabling the electromagnetic control measures for digital channelization, there are no signals of the navigation radar in the sorting results of the reconnaissance equipment, as Figure 5 shown; The embodiments prove that the control method proposed by the present invention is effective.

[0023] Through status reporting and instruction control of the electromagnetic control equipment (or software), the present invention sends the controlled frequency points and timing to the reconnaissance equipment and the electromagnetic emission equipment in real time. The reconnaissance equipment selects to close the corresponding digital channelized filter channels according to the control command, so that the signals of the electromagnetic emission equipment will not enter the detection and analysis stage, thus ensuring the integrity and continuity of the effective working time of the reconnaissance equipment and improving the signal interception probability of the reconnaissance equipment for signals in other frequency bands. At the same time, for high-value radiation source targets, the electromagnetic emission equipment can avoid the frequency band of the channel where the high-value target is located in real time, ensure the stable reconnaissance of high-value radiation source targets, and improve the compatible working ability of multi-sensor integrated equipment. The present invention is applicable to electromagnetic emission equipment with high pulse repetition frequency and frequency agility and reconnaissance equipment adopting digital channelized filtering working mode, and is of great significance for improving the signal interception probability and sorting accuracy of the reconnaissance equipment under electromagnetic control.

[0024] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A digital channelized filtering electromagnetic compatibility control method, characterized in that: The following steps are involved: Step 1: Use a filtering electromagnetic compatibility control system, the system includes an electromagnetic control module, an electromagnetic transmitting module, and a reconnaissance module. There is a real-time transmission channel between the electromagnetic control module and the electromagnetic transmitting module and the reconnaissance module for transmitting instructions and reporting status in real time; Step 2: The electromagnetic transmitting module and the reconnaissance module report their working status to the electromagnetic control module, and the electromagnetic control module determines whether control is required; Step 3: If no control is required, the electromagnetic control module sends a control cancellation instruction to the electromagnetic transmission module and the reconnaissance module. After receiving the control cancellation instruction, the reconnaissance module opens the sub-channel; After receiving the control cancellation command, the electromagnetic transmission module stops frequency avoidance; Step 4: If control is required, the electromagnetic control module generates control instructions based on the reported working status and the pre-set control logic, and sends them to the electromagnetic launch module and the reconnaissance module; Step 5: When the electromagnetic transmitting module performs frequency avoidance, after receiving the control instruction, the electromagnetic transmitting module avoids the corresponding sub-channel or stops transmitting according to the working frequency point of the control instruction; When the reconnaissance module performs frequency avoidance, after receiving the control instruction, the reconnaissance module closes the corresponding sub-channel according to the working frequency of the control instruction.

2. The digital channelized filtering electromagnetic compatibility control method according to claim 1, characterized in that: The method further includes step 6: detecting and analyzing the PDW and EDW after the corresponding sub-channel is closed.

3. The digital channelized filtering electromagnetic compatibility control method according to claim 2, characterized in that: The method also includes step 7: the reconnaissance module sends the PDW and EDW obtained through detection and analysis after closing the corresponding sub-channel to a display device for display.

4. The digital channelized filtering electromagnetic compatibility control method according to claim 1, characterized in that: The working status reported in step 2 includes working mode and working frequency band. The working mode includes active detection and passive reconnaissance.

5. The digital channelized filtering electromagnetic compatibility control method according to claim 4, characterized in that: Step 2 also includes reporting the working frequency in real time through the real-time transmission channel , transmit / receive timing, the transmit / receive timing includes transmit control timing pulse and receive control timing pulse.

6. The digital channelized filtering electromagnetic compatibility control method according to claim 1, characterized in that: The situation in step 3 where no control is required includes that after the working states reported by the electromagnetic transmitting module and the reconnaissance module change, the electromagnetic control module determines to cancel the control of the reconnaissance module and the electromagnetic transmitting module.

7. The digital channelized filtering electromagnetic compatibility control method according to claim 6, characterized in that: In step 3, after receiving the control cancellation instruction, the reconnaissance module opens the closed sub-channel; After receiving the control cancellation command, the electromagnetic transmitting module stops the frequency to avoid the controlled frequency range.

8. The digital channelized filtering electromagnetic compatibility control method according to claim 1, characterized in that: The control instructions in step 4 include the controlled module and the control frequency range. , control timing.

9. The digital channelized filtering electromagnetic compatibility control method according to claim 8, characterized in that: In step 5, when the electromagnetic transmitting module performs frequency avoidance, after receiving the control instruction, the electromagnetic transmitting module avoids the working frequency according to the control instruction. The corresponding sub-channel may stop transmitting; When the reconnaissance module performs frequency avoidance, after receiving the control command, the reconnaissance module will Calculate the subchannels that need to be closed for digital channelization filtering, that is, when of filter channels need to be turned off. Indicates The minimum frequency in the band of the sub-channels, Indicates The maximum frequency within a subchannel band.

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