Broadband digital active radio frequency decoy projectile, interference method and method for increasing instantaneous bandwidth and frequency band

Abstract

The invention provides a broadband digital active radio frequency decoy projectile, an interference method and a method for increasing instantaneous bandwidth and frequency band, and the decoy projectile comprises a thermal battery which is located behind the decoy projectile and is used for providing an energy source for the decoy projectile; the high-isolation transmitting-receiving antenna is located at the front end of the decoy bullet and comprises a receiving antenna and a transmitting antenna, and the polarization directions of the receiving antenna and the transmitting antenna are opposite; the main control system is located in the middle of the bait bullet, the main control system comprises a radio frequency board, a data processing board and a secondary power supply board, the radio frequency board is used for processing external signals obtained by the receiving antenna, and the data processing board is used for processing signal data received from the radio frequency board. The bait missile provided by the invention is compact in overall structure, the airspace coverage range can be effectively enlarged, and large-bandwidth signal processing can be realized in a small volume.

Description

Technical Field

[0001] The invention relates to the technical field of electronic countermeasures, and in particular to a broadband digital active radio frequency decoy bomb and an interference method and a method for increasing instantaneous bandwidth and frequency band. Background Art

[0002] In the electronic information warfare of modern warfare, the mutual attack, defense, interference and confrontation between the enemy and our radar guidance systems and aircraft platforms have become the key to seize air superiority, and even determine the battlefield situation to a certain extent. Active RF decoys play a very important role in this, through reconnaissance, suppression, deception and other methods, combined with various use strategies and application scenarios such as platform self-defense, auxiliary attack or electronic camouflage, to interfere with enemy radar guidance or seeker tracking, consume enemy attack resources and protect the aircraft platform.

[0003] Compared with traditional decoys, broadband digital active RF decoys represent the development direction of modern electronic warfare equipment, achieving higher frequency coverage, intelligent operation and dynamic jamming capabilities. With the continuous upgrading of war technology and radar systems, broadband digital active RF decoys have become key equipment to enhance combat effectiveness and ensure the survivability of the army, gradually replacing the role of traditional decoys in many modern combat scenarios.

[0004] The development of broadband digital active RF decoys not only improves the self-protection capability of carrier aircraft, but also promotes the progress of related technologies such as digital RF memory and miniaturized electronic devices, which has a profound impact on the field of modern military electronics. However, broadband digital active RF decoys in existing technologies have the problems of small airspace coverage and small bandwidth. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention provides a broadband digital active radio frequency decoy bomb and interference method and a method for increasing instantaneous bandwidth and frequency band.

[0006] The present invention provides a broadband digital active radio frequency decoy bomb, comprising: a thermal battery located at the rear of the decoy bomb, used to provide an energy source for the decoy bomb; a high-isolation transceiver antenna located at the front end of the decoy bomb, the high-isolation transceiver antenna comprising a receiving antenna and a transmitting antenna, the receiving antenna and the transmitting antenna having opposite polarization directions; a main control system located in the middle of the decoy bomb, the main control system comprising a radio frequency board, a data processing board and a secondary power supply board, the radio frequency board being used to process external signals acquired by the receiving antenna, and the data processing board being used to process signal data received from the radio frequency board.

[0007] Optionally, the RF board includes a receiving unit and a transmitting unit; wherein the receiving unit includes a broadband low-noise amplifier and a down converter, the broadband low-noise amplifier is used to amplify the signal obtained from the receiving antenna, and the down converter is used to convert the amplified signal into a baseband signal, and the baseband signal is high-speed serial data; the transmitting unit includes an up converter, and the up converter is used to convert the baseband signal into a signal of the original RF frequency.

[0008] Optionally, the data processing board includes: a digital-to-analog conversion unit, a data storage unit, and a control unit; wherein the digital-to-analog conversion unit includes a digital-to-analog converter and an analog-to-digital converter; the data storage unit includes a data distributor and a memory, the data distributor is used to convert the high-speed serial data obtained from the down-converter into low-speed parallel data matching the write time of the memory and store it to a specified memory address, and the memory is used to store processed waveform data; the control unit includes a controller for controlling the reading and writing of signal data in the memory.

[0009] Optionally, the data distributor is further used to perform secondary modulation on at least one of the amplitude, phase and Doppler frequency deviation parameters of the waveform stored in the memory.

[0010] Optionally, the broadband digital active RF decoy bomb also includes: a plurality of folding wings, each two folding wings are arranged in a group on one side of the thermal battery, wherein the first end of each folding wing is connected to the thermal battery, and the second ends of the two folding wings on the same side of the thermal battery are connected to each other, and after the broadband digital active RF decoy is launched, the second end of the folding wing moves away from the other folding wing.

[0011] Optionally, the broadband digital active radio frequency decoy bomb also includes: an interference source, which is used to transmit an interference signal to an external target.

[0012] Optionally, a polarization isolation device is provided at the rear end of the receiving antenna and the front end of the transmitting antenna, and the polarization isolation device includes an orthogonal mode converter.

[0013] Optionally, the broadband digital active radio frequency decoy bomb also includes: an infrared simulation source for simulating the infrared characteristics of the target through thermal radiation.

[0014] The present invention also provides an interference method using a broadband digital active radio frequency decoy, comprising the following steps: providing an aircraft provided with a broadband digital active radio frequency decoy, launching the decoy through a foil strip or an infrared decoy projector on the aircraft to obtain a radar signal of an external target, wherein the radar signal has an original radio frequency frequency; the radar signal is connected to the decoy through a receiving antenna in a high-isolation transceiver antenna; amplifying and converting the radar signal into a baseband signal through a broadband low-noise amplifier and a down-converter in sequence, wherein the baseband signal is a first analog signal; converting the first analog signal into a first digital signal through a digital-to-analog converter, wherein the first digital signal is high-speed serial data; and converting the first digital signal into a digital signal that is consistent with a memory write time by using a data distributor. A matching second digital signal is obtained and stored in a specified memory address, wherein the second digital signal is low-speed parallel data; the signal data stored in the memory is subjected to secondary modulation of amplitude, phase, and Doppler frequency deviation parameters by the data distributor to obtain a third digital signal, wherein the third digital signal is low-speed parallel data; the third digital signal is read out by a controller in the decoy bomb; the third digital signal is converted into a fourth digital signal by the data distributor, and the fourth digital signal is high-speed serial data; the fourth digital signal is converted into a second analog signal by an analog-to-digital converter; the second analog signal is converted into a signal with an original radio frequency frequency by an up-converter; and the signal with the original radio frequency frequency is sent to an external target by a transmitting antenna.

[0015] The present invention also provides a method for increasing the instantaneous bandwidth of a broadband digital active radio frequency decoy flare, comprising the following steps: the broadband digital active radio frequency decoy flare receives an external radio frequency signal, the center frequency of the radio frequency signal is f MHz, and the bandwidth is B MHz; the external radio frequency signal is divided into two paths by a power divider in the broadband digital active radio frequency decoy flare: a first sub-signal and a second sub-signal, wherein the frequency of the first sub-signal is f1, and the frequency of the second sub-signal is f2; the local oscillator is controlled by a first frequency code to generate a frequency of f1=fB / 2MHz, and the local oscillator is controlled by a second frequency code to generate a frequency of f2=f+B / 2MHz, and after processing, the input frequency ranges of the first sub-signal and the second sub-signal are [-B / 2, 0] and [0, B / 2] respectively; and the first sub-signal and the second sub-signal are mixed into intermediate frequency signals with the same B / 2MHz bandwidth.

[0016] The present invention also provides a method for increasing the frequency band of a broadband digital active radio frequency decoy bomb, comprising the following steps: when a signal is input, a receiving antenna introduces a received broadband bandwidth signal into a 90° bridge, and divides the received broadband bandwidth signal into two bandwidth radio frequency signals according to power, wherein the two bandwidth radio frequency signals include a first low-frequency signal and a first high-frequency signal; the first low-frequency signal and the first high-frequency signal are mixed into intermediate frequency signals of the same bandwidth and stored; when a signal is output, the signal to be output includes a first intermediate frequency signal to be output as a low-frequency signal and a second intermediate frequency signal to be output as a high-frequency signal, wherein the first intermediate frequency signal is a signal that can be directly processed by an analog-to-digital converter, and the first intermediate frequency signal is converted from a digital signal to an analog signal by the analog-to-digital converter to obtain a second low-frequency signal; the second intermediate frequency signal is up-converted by the local oscillator of the decoy bomb, and the second intermediate frequency signal is modulated into a second high-frequency signal with an original radio frequency frequency; the second low-frequency signal and the second high-frequency signal are mixed by a 90° bridge; and the mixed signal is output by a transmitting antenna.

[0017] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0018] The invention provides a broadband digital active radio frequency decoy and jamming method, which has a compact overall structure through sequentially arranged thermal batteries, a main control system, and forward and backward high isolation transceiver antennas, and can effectively increase the airspace coverage. At the same time, the invention also provides a method for increasing the instantaneous bandwidth and frequency band of the broadband digital active radio frequency decoy, by dividing the broadband bandwidth signal into two-way broadband radio frequency signals, and then mixing them into the same bandwidth intermediate frequency signal, to achieve signal folding and combining, thereby achieving large bandwidth signal processing in a small volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic structural diagram of a broadband digital active radio frequency decoy bomb according to an embodiment of the present disclosure;

[0021] Figure 2 This is a schematic diagram of the internal structure of a broadband digital active radio frequency decoy bomb according to an embodiment of the present disclosure;

[0022] Figure 3 It is a structural schematic diagram of the connection relationship between the thermal battery and the folding wing in the closed state of an embodiment of the present disclosure;

[0023] Figure 4This is a structural schematic diagram of the connection relationship between the thermal battery and the folding wing in the working state of an embodiment of the present disclosure;

[0024] Figure 5 It is a structural schematic diagram of a polarization isolation device according to an embodiment of the present disclosure;

[0025] Figure 6 A schematic diagram of the working principle of using a vector network analyzer to improve the transmit-receive isolation of a broadband digital active radio frequency decoy bomb according to an embodiment of the present disclosure;

[0026] Figure 7 It is a schematic structural diagram of a broadband digital active radio frequency decoy bomb according to another embodiment of the present disclosure;

[0027] Figure 8 A schematic diagram of the working principle of a method for increasing the instantaneous bandwidth of a broadband digital active radio frequency decoy bomb according to an embodiment of the present disclosure;

[0028] Fig. 9 The present invention is a schematic diagram of the working principle of a method for increasing the frequency band of a broadband digital active radio frequency decoy according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0030] In the present invention, unless otherwise specified, the directional words used, such as "upper and lower", generally refer to the upper and lower parts of the device in normal use, and "inside and outside" refer to the outline of the device. In addition, the terms "first, second, third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first, second, third" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In the present invention, it is an electrical device, so connection and interconnection both refer to conductive interconnection. Since the accompanying drawings are descriptions of the same device, the same numbers in the drawings represent the same components.

[0031] In order to provide a further understanding of the purpose, structure, features and functions of the present invention, specific examples of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0032] The present invention provides a broadband digital active radio frequency decoy bomb, comprising: a thermal battery located at the rear of the decoy bomb, used to provide an energy source for the decoy bomb; a high-isolation transceiver antenna located at the front end of the decoy bomb, the high-isolation transceiver antenna comprising a receiving antenna and a transmitting antenna, the receiving antenna and the transmitting antenna having opposite polarization directions; a main control system located in the middle of the decoy bomb, the main control system comprising a radio frequency board, a data processing board and a secondary power supply board, the radio frequency board being used to process external signals acquired by the receiving antenna, and the data processing board being used to process signal data received from the radio frequency board.

[0033] Figure 1 and Figure 2 The schematic diagram of the structure of the broadband digital active radio frequency decoy bomb in the embodiment of the present disclosure is shown. As shown in the figure, the broadband digital active radio frequency decoy bomb includes a thermal battery 10, a high isolation transceiver antenna 20 and a main control system 30.

[0034] The thermal battery 10 is used to provide an energy source for the entire decoy. Since the broadband digital active RF decoy needs to run for a long time in the airspace and consumes a lot of electricity, the thermal battery can ensure that the decoy works autonomously without an external power source, which is suitable for high-intensity environments. In some embodiments, the thermal battery can provide instantaneous and stable current output to meet the device's demand for high instantaneous power.

[0035] The high isolation transceiver antenna is used to achieve efficient transmission and reception of radio frequency signals, and has the characteristics of high isolation in the front and back directions to avoid mutual interference between the received and transmitted signals. The high isolation transceiver antenna design adopts a high isolation structure to ensure that there is no mutual interference in the transmission and reception frequency bands, so that the device can work simultaneously in multiple directions and multiple frequency bands, enhancing its coverage in the airspace.

[0036] Specifically, in the embodiment of the present disclosure, the high isolation transceiver antenna 20 includes a receiving antenna 210 and a transmitting antenna 220. The polarization directions of the receiving antenna 210 and the transmitting antenna 220 are opposite. For example, in one embodiment, the receiving antenna uses vertical polarization, and the transmitting antenna uses horizontal polarization; in another embodiment, the receiving antenna can use left-hand circular polarization, and the transmitting antenna can use right-hand circular polarization, or vice versa, which is not limited in the embodiment of the present disclosure.

[0037] The main control system 30 includes a radio frequency board 310, a data processing board 320 and a secondary power supply board 330. The radio frequency board 310 is used to generate and process radio frequency signals, mainly to generate broadband signals and send them out after modulation. At the same time, it can receive radio frequency signals from external devices to achieve signal interaction with the outside world. It is the core functional part of the broadband digital active radio frequency decoy bomb. Specifically, the radio frequency board 310 includes a receiving unit and a transmitting unit, such as Figure 2 As shown, the receiving unit includes a broadband low-noise amplifier and a down-converter, the broadband low-noise amplifier obtains a signal from a receiving antenna and amplifies it, and the down-converter converts the amplified signal into a baseband signal; the transmitting unit includes an up-converter, and the up-converter is used to convert the baseband signal into a second RF signal of the original RF frequency. In the embodiment of the present disclosure, when the receiving antenna receives a first RF signal from the outside world, the broadband low-noise amplifier amplifies the received first RF signal; then, the down-converter converts the first RF signal into a baseband signal.

[0038] Reference Figure 2 The data processing board 320 includes a digital-to-analog conversion unit, a data storage unit and a control unit, which are responsible for processing the data received from the radio frequency board 310, performing necessary data demodulation and processing, and controlling the transmission of the radio frequency signal. The digital-to-analog conversion unit includes a digital-to-analog converter and an analog-to-digital converter, and the data storage unit includes a data distributor and a memory. The data distributor is used to convert the high-speed serial data obtained from the downconverter into low-speed parallel data that matches the write time of the memory and stores it in a specified memory address. The memory is used to store the processed waveform data; the control unit includes a controller for controlling the reading and writing of signal data in the memory. The data processing board 320 can quickly process a large amount of data, ensure the real-time nature of signal processing, and thus achieve efficient data flow and control.

[0039] In the embodiment of the present disclosure, the main control system 30 also includes a secondary power supply board 330, which provides a stable power supply for the main control system 30 to ensure the normal operation of the main control system 30. The secondary power supply board 330 can further stabilize the power provided by the thermal battery 10 and provide different voltages and currents required by different units.

[0040] In some embodiments, the data distributor is further used to perform secondary modulation of amplitude, phase and Doppler frequency deviation parameters on the waveform stored in the memory.

[0041] For example, in a specific embodiment, the broadband digital active radio frequency decoy flare is very small in size and is launched through the foil strips or infrared decoy flare projector of the aircraft. After launching, the broadband digital active radio frequency decoy flare starts to work within 1 second. The enemy radar signal enters the decoy flare through the receiving antenna in the high isolation transceiver antenna, and the input radar signal passes through the broadband low noise amplifier and down converter to the baseband, and is converted into digital form through the digital-to-analog converter. Then, the high-speed serial data is converted into low-speed parallel data that matches the write time of the memory through the data distributor and stored in the specified memory address. At the same time, the data distributor performs secondary modulation of additional parameters such as amplitude, phase, Doppler frequency deviation, etc. on the stored waveform according to the designed interference strategy, thereby realizing multiple functions such as RCS simulation, relative position simulation, and speed simulation. The broadband digital active radio frequency decoy flare can accurately replicate the characteristics of the enemy radar signal, including carrier frequency, pulse repetition frequency, pulse width, etc., so as to form a false target similar to the real target on the enemy radar. Once launched, the broadband digital active RF decoy can work autonomously without the need for continuous manual control, which reduces the reliance of the decoy on the carrier aircraft and improves combat efficiency. After simulating the false target, the controller selects the correct storage address, reads the signal data in the memory and converts the low-speed parallel data into high-speed serial data through the data selector, and then converts the digital signal into analog form through the analog-to-digital converter, and then up-converts it to the original RF frequency using the same local oscillator used in the down-conversion, and then transmits the signal to the enemy through the transmitting antenna. This completes the processing of the original signal. Various working mode selections can be realized through the controller to meet various different application requirements.

[0042] In the disclosed embodiment, the broadband digital active radio frequency decoy bomb further includes a plurality of folding wings 40, such as Figure 3 As shown, each two folding wings 40 form a group and are arranged on one side of the thermal battery 10, wherein the first end of each folding wing 40 is connected to the thermal battery 10, and the second ends of the two folding wings 40 located on the same side of the thermal battery are connected to each other. After the broadband digital active radio frequency decoy bomb is launched, Figure 4 , the second end of the folding wing 40 moves in a direction away from the other folding wing. The miniaturization and lightweight design of the broadband digital active RF decoy flares allow them to be carried and launched by a variety of platforms, including fighters, bombers, and drones. At the same time, compared with traditional systems, the broadband digital active RF decoy flares are generally of lower cost, which allows them to be deployed on a large scale while providing effective protection for the carrier aircraft.

[0043] In some embodiments, further, the RCS values ​​of different aircraft types and angles can be simulated according to the relationship between the decoy bomb, the carrier aircraft equipped with the decoy bomb and the direction of the enemy radar wave; further, a time delay can be added to simulate the different relative positions of the false target in the real aircraft; further, a speed correction can be performed to compensate for the speed lost by the decoy after being ejected; further, interference can be added to increase the accuracy of the incoming missile in obtaining accurate echoes.

[0044] In a specific embodiment, the RCS signal power Pr received by the enemy radar is: For a given enemy radar system, the target echo signal power received by the radar varies only with the target's radar cross section (RCS) and the distance R between the target and the radar. The RCS of the decoy is much smaller than that of the carrier aircraft. In order to simulate the actual RCS reflected signal power of the carrier aircraft, the forward gain needs to be calculated after measuring the actual power. At the same time, the random variable σ of the radar cross section of a typical flying object is χ 2 The probability density function is When k = 1, the fluctuation characteristics are slow fluctuations, and the pulses are correlated in one scan. Typical targets such as small jet aircraft observed forward can be represented by this model. The formula is: When K = N, its fluctuation characteristics are fast fluctuations, and the pulses in one scan are uncorrelated. Typical targets such as jet aircraft and large civil airliners can be represented by this model. The formula is The device can calculate the relative coefficient of RCS according to the relative relationship between the carrier aircraft, the decoy and the incoming missile, multiply it by the calculated RCS gain value, and launch it to guide the incoming missile to track the decoy and protect the carrier aircraft. The 3D characteristics of the carrier aircraft RCS can also be actually measured and pre-stored in the memory of the decoy, and the relative coefficient of RCS can be interpolated and calculated according to the relative relationship between the carrier aircraft, the decoy and the incoming missile when used.

[0045] In some embodiments, the head of the decoy is a large sphere, that is, a nearly flat head, with a large drag coefficient. In order to maintain attitude stability, the drag coefficient of the arc-shaped tail is even greater, which results in a large speed difference between the decoy and the carrier aircraft immediately after release, making it easy to be identified by the enemy's PD radar. Therefore, the trajectory of the decoy after it is ejected is calculated, and after being leveled, it is usually a horizontal free-fall trajectory. The time-related speed attenuation value is pre-stored in the decoy. After launch, the Doppler frequency deviation is calculated based on the pre-stored speed attenuation, and the launch frequency is continuously corrected to achieve a speed radar reflection signal characteristic equivalent to that of the carrier aircraft within the working time.

[0046] In the disclosed embodiment, the broadband digital active RF decoy bomb also includes an interference source, which is used to transmit interference signals to external radars. In the application of broadband digital active RF decoy bombs in electronic countermeasures, it receives enemy radar signals and releases interference to counter the tracking of enemy missile radar seekers, and transmits a large number of interference signals similar to environmental noise to enemy radars in a direction, thereby reducing the signal-to-noise ratio of enemy radars, suppressing the effective detection distance of enemy radars, and interfering with the normal reconnaissance and identification of our aircraft platforms by enemy detection radars, covering the penetration of our aircraft or missiles, and achieving the purpose of electronic camouflage of real aircraft and avoiding precise interference or attack by the enemy.

[0047] In some embodiments, the interference signal emitted by the interference source must meet the following conditions in terms of frequency domain characteristics: first, it is easy to obtain sufficiently large power; second, the interference spectrum is wide. Usually, the broadband digital active RF decoy bomb targets the enemy's PD radar seeker, mainly the tracking system of the seeker, and these tracking systems are mostly narrowband systems. Therefore, when the broadband digital active RF decoy bomb is in working state, the interference source can judge the frequency and bandwidth of the signal and emit a targeted suppression signal.

[0048] In some embodiments, in addition to the basic decoy function, the broadband digital active RF decoy can also perform detection, suppression and other electronic warfare tasks, allowing a single platform to perform multiple combat missions. For example, the broadband digital active RF decoy can dynamically adjust its own interference strategy according to the changes in the mode and type of external threats to adapt to the ever-changing battlefield environment. In the interception phase, suppressive interference can be implemented at an appropriate time to reduce the target interception capability of the enemy radar seeker and destroy the seeker from interception to tracking; in the tracking phase, deceptive interference is implemented to ensure that sufficient interference energy is injected into the seeker receiver, and transfer interference is implemented to the enemy radar seeker, resulting in an increase in the "miss rate" of the missile.

[0049] In some embodiments, polarization isolation devices are provided at the rear end of the receiving antenna and the front end of the transmitting antenna to improve the transmit and receive isolation of the active decoy bomb. Figure 5 In the orthogonal mode converter shown, the received and transmitted signals are transmitted along a common waveguide, and power signal distribution is performed via a T-junction. One signal passes through an H-plane waveguide turn, and the other signal passes through an E-plane turn. After passing through the E-plane turn or the H-plane turn and the E-plane turn, the phases of the electromagnetic wave signals in the two symmetrical branch waveguides are inverted, achieving the effect of polarization separation.

[0050] In some embodiments, the transmit-receive isolation of active decoy bombs can also be improved through software processing. Specifically, the coupling amount and delay of each frequency band can be measured in advance. Since the transmission time, frequency and transmission power are known, the residual self-interference signal in the received RF signal can be calculated, so as to estimate the residual self-interference signal in the time domain, and then subtract it from the received signal to achieve the purpose of increasing isolation. Figure 6 As shown, a vector network analyzer is used between test point A and test point B to measure S21 of the full frequency band, and the measurement data is pre-stored in a data memory. During actual operation, the frequency of the received signal is measured, and the test data is corrected according to the frequency.

[0051] The modular design of the broadband digital active RF decoy allows for rapid replacement of payloads to accommodate different missions and threats. In some embodiments, Figure 7 As shown, the broadband digital active RF decoy bomb also includes an infrared simulation source 50, which is used to simulate the infrared characteristics of the target through thermal radiation, so as to achieve the combination of infrared and radar decoys. The combination of the two can simultaneously present a "false target" in the electromagnetic and infrared spectra to enhance the overall decoy effect. This modularity and reconfigurability can enhance the flexibility and adaptability of the broadband digital active RF decoy system.

[0052] In some embodiments, the broadband digital active RF decoy bomb also includes a multi-directional distributed information networking. Specifically, a variety of decoy bombs with different frequency bands, different powers, and different interference systems can be used to carry out full-band coordinated detection of the target. And combined with information sharing group decision-making, the best interference strategy is specified. The miniaturization and coordination trend of decoy bombs can also take into account their own concealment while improving the interference effect, making active decoy bombs more difficult to be discovered and cleared. At the same time, the user is allowed to edit the internal program of the decoy bomb, so that different external threats can be identified and responded to, and threats that may be encountered in a specific task or in a specific area can be dealt with more specifically. Through networked collaboration, the broadband digital active RF decoy bomb can achieve multi-bomb coordinated interference and improve the effectiveness of confrontation. The broadband digital active RF decoy bomb can quickly adapt to different threat environments and change its signal characteristics through software programming to counter various types of radar and missile systems.

[0053] The disclosed embodiment provides a broadband digital active radio frequency decoy bomb. When working, the power supply is started to enable the thermal battery to provide power for the entire decoy bomb, and the secondary power supply board stabilizes the voltage and distributes power to the main control system and the high isolation transceiver antenna; the radio frequency board receives the external radio frequency signal and sends the received signal to the data processing board for demodulation and processing to generate the required broadband signal. The data processing board modulates it into a specific signal form according to the received data, and makes necessary feedback adjustments to ensure the real-time and accuracy of the broadband signal, and then transmits the broadband signal to the airspace through the front-end antenna. This compact structural design effectively realizes the instantaneous large bandwidth demand in a small volume, so that the decoy bomb can cover a larger airspace range. Through the design of the high isolation transceiver antenna, the broadband digital active radio frequency decoy bomb can maintain efficient signal transmission and reception performance in a complex electromagnetic environment. At the same time, compared with traditional systems, the broadband digital active radio frequency decoy bombs are generally of lower cost, which allows them to be deployed on a large scale, provide effective protection for carrier aircraft, and counter modern radar-guided weapons with complex guidance and anti-interference capabilities, thereby increasing the survival probability of carrier aircraft in high-threat environments.

[0054] The embodiment of the present disclosure also provides an interference method using the broadband digital active radio frequency decoy, comprising the steps of:

[0055] S1: An aircraft is provided with a broadband digital active radio frequency decoy flare, and the decoy flare is launched through a foil strip or an infrared decoy flare launcher on the aircraft to obtain a radar signal of an external target, wherein the radar signal has an original radio frequency frequency.

[0056] S2: The radar signal is connected to the decoy bomb through the receiving antenna in the high isolation transceiver antenna.

[0057] S3: Amplify the radar signal and convert it into a baseband signal through a broadband low-noise amplifier and a down-converter in sequence, where the baseband signal is a first analog signal.

[0058] S4: Convert the first analog signal into a first digital signal through a digital-to-analog converter, where the first digital signal is high-speed serial data.

[0059] S5: using a data distributor to convert the first digital signal into a second digital signal that matches the memory write time, and store it in a designated memory address, wherein the second digital signal is low-speed parallel data.

[0060] S6: performing secondary modulation of amplitude, phase, and Doppler frequency deviation parameters on the signal data stored in the memory through the data distributor to obtain a third digital signal, wherein the third digital signal is low-speed parallel data.

[0061] S7: The third digital signal is read out by the controller in the decoy bomb.

[0062] S8: Utilize the data distributor to convert the third digital signal into a fourth digital signal, wherein the fourth digital signal is high-speed serial data.

[0063] S9: Convert the fourth digital signal into a second analog signal through an analog-to-digital converter.

[0064] S10: Convert the second analog signal into a signal with an original radio frequency through an up-converter.

[0065] S11: Send the signal with the original radio frequency to an external target through a transmitting antenna.

[0066] The disclosed embodiment also provides a method for increasing the instantaneous bandwidth of a broadband digital active RF decoy, comprising the steps of: the broadband digital active RF decoy receives an external RF signal, the center frequency of the RF signal is fMHz, and the bandwidth is B MHz; the external RF signal is divided into two paths by a power divider in the broadband digital active RF decoy: a first sub-signal and a second sub-signal, wherein the frequency of the first sub-signal is f1, and the frequency of the second sub-signal is f2; the local oscillator is controlled by a first frequency code to generate a frequency of f1=fB / 2MHz, and the local oscillator is controlled by a second frequency code to generate a frequency of f2=f+B / 2MHz, and after processing, the input frequency ranges of the first sub-signal and the second sub-signal are [-B / 2, 0] and [0, B / 2] respectively; the first sub-signal and the second sub-signal are mixed to the same intermediate frequency signal with a bandwidth of B / 2MHz. The method reduces the sampling rate requirement, and the sampling rate only needs to be greater than B / 2. The back end processes the two signals separately, and all information of the external RF signal can be retained.

[0067] Reference Figure 8, the center frequency of the external RF signal is f MHz, and the bandwidth is B MHz. After being transmitted to the decoy bomb, the external RF signal is divided into two signals through the power divider in the decoy bomb: a first sub-signal and a second sub-signal, wherein the frequency of the first sub-signal is f1, and the frequency of the second sub-signal is f2, and the first sub-signal and the second sub-signal are used for different signal processing modules. Then, the decoy bomb controls the frequency of the local oscillator through the frequency code to achieve the separation and coverage of the sub-band signals; specifically, the local oscillator is controlled by the first frequency code to generate a frequency of f1=fB / 2MHz, and the local oscillator is controlled by the second frequency code to generate a frequency of f2=f+B / 2MHz. After down-conversion processing, the input frequency ranges of the first sub-signal and the second sub-signal are [-B / 2, 0] and [0, B / 2] respectively. Afterwards, the first sub-signal and the second sub-signal are respectively processed by the control system after A / D conversion. In this way, the first sub-signal and the second sub-signal are mixed into the same intermediate frequency signal with a bandwidth of B / 2 MHz, and then combined and processed to cover the frequency band [-B / 2, B / 2] of the entire signal.

[0068] The method for increasing the instantaneous bandwidth of a broadband digital active RF decoy provided in the embodiment of the present disclosure performs frequency conversion on the input signal to achieve coverage processing of the broadband signal. After the external RF signal is segmented, the input frequency range of each processed signal is [0, B / 2], which is reduced compared to the original frequency band. According to the sampling theorem, the sampling rate needs to be greater than twice the signal bandwidth. The sampling rate required for the original RF signal processing is fc>B, while after segmented processing, each sub-signal only needs to meet fc>B / 2, which significantly reduces the sampling rate requirement, overcomes the high bandwidth requirement of direct sampling of broadband signals, reduces the complexity of data processing, and improves the processing efficiency and flexibility of the decoy.

[0069] The disclosed embodiment also provides a method for increasing the frequency band of a broadband digital active RF decoy bomb, comprising: when a signal is input, a receiving antenna introduces a received broadband bandwidth signal into a 90° bridge, and divides the received broadband bandwidth signal into two bandwidth RF signals according to power, wherein the two bandwidth RF signals include a first low-frequency signal and a first high-frequency signal; the first low-frequency signal and the first high-frequency signal are mixed into intermediate frequency signals of the same bandwidth and stored; when a signal is output, the signal to be output includes a first intermediate frequency signal to be output as a low-frequency signal and a second intermediate frequency signal to be output as a high-frequency signal, wherein the first intermediate frequency signal is a signal that can be directly processed by an analog-to-digital converter, and the first intermediate frequency signal is converted from a digital signal to an analog signal by the analog-to-digital converter to obtain a second low-frequency signal; the second intermediate frequency signal is up-converted by the local oscillator of the decoy bomb, and the second intermediate frequency signal is modulated into a second high-frequency signal with the original RF frequency; the second low-frequency signal and the second high-frequency signal are mixed by a 90° bridge; and the mixed signal is output by a transmitting antenna.

[0070] Specifically, in the embodiments of the present disclosure, Figure 8 As shown, the receiving antenna introduces the received broadband bandwidth signal into the 90° bridge through a high-isolation RF device, and divides the broadband bandwidth signal into two RF signals according to power, and the two RF signals include a first low-frequency signal and a first high-frequency signal; for the first low-frequency signal, it enters the second channel (RX2) of the digital-to-analog (A / D) chip for direct processing without any frequency conversion operation, and obtains a first digital signal. For the first high-frequency signal, the local oscillator provided by the broadband digital active RF decoy bomb is used for down-conversion signal processing, and the first high-frequency signal is modulated to a low frequency that can be processed by the A / D chip, and enters the first channel (RX1) of the A / D chip for processing to obtain a second digital signal; after completing the digital-to-analog conversion, the first digital signal and the second digital signal are combined and stored, that is, the digital mode of the first low-frequency signal and the digital mode of the first high-frequency signal are mixed to the intermediate frequency signal of the same bandwidth and stored, so as to achieve the purpose of processing broadband signals.

[0071] Similarly, when the signal is output, the signal to be output includes a first intermediate frequency signal to be output as a low-frequency signal and a second intermediate frequency signal to be output as a high-frequency signal, wherein the frequency of the first intermediate frequency signal to be output as a low-frequency signal belongs to the frequency range that can be processed by the analog-to-digital (D / A) chip, and the first intermediate frequency signal is directly output through the first channel (TX1) of the D / A chip, and the first intermediate frequency signal is converted from a digital signal to an analog signal to obtain a second low-frequency signal. In the case where a high-frequency signal needs to be output, the second intermediate frequency signal with frequency shift processing is first output through the second channel (TX2) of the D / A chip, and then the local oscillator provided by the decoy bomb is used to perform up-conversion signal processing, and the second intermediate frequency signal is modulated into a second high-frequency signal with the original radio frequency.

[0072] Afterwards, the second high-frequency signal and the directly output second low-frequency signal are mixed through a 90° bridge, and then radiated through a transmitting antenna after passing through a high-isolation radio frequency device.

[0073] The method for increasing the frequency band of a broadband digital active radio frequency decoy provided by the embodiment of the present disclosure can better adapt to the interference requirements of different frequencies and expand the countermeasure range of the decoy. In practical applications, this broadband processing technology makes the decoy more flexible and practical when facing a complex electromagnetic environment.

[0074] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structural or equivalent process transformations made using the contents of the specification and drawings of the present application, such as the mutual combination of technical features between the embodiments, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A broadband digital active radio frequency decoy, characterized in that: include: A thermal battery located behind the decoy bomb, used to provide an energy source for the decoy bomb; A high-isolation transceiver antenna located at the front end of the decoy bomb, the high-isolation transceiver antenna comprising a receiving antenna and a transmitting antenna, the receiving antenna and the transmitting antenna having opposite polarization directions; The main control system is located in the middle of the decoy bomb, and the main control system includes a radio frequency board, a data processing board and a secondary power supply board. The radio frequency board is used to process the external signal obtained by the receiving antenna, and the data processing board is used to process the signal data received from the radio frequency board.

2. The broadband digital active radio frequency decoy bomb as claimed in claim 1, characterized in that: The radio frequency board includes a receiving unit and a transmitting unit; wherein, The receiving unit includes a broadband low noise amplifier and a down converter, wherein the broadband low noise amplifier is used to amplify the signal obtained from the receiving antenna, and the down converter is used to convert the amplified signal into a baseband signal, wherein the baseband signal is high-speed serial data; The transmitting unit comprises an up-converter, which is used for converting a baseband signal into a signal of an original radio frequency frequency.

3. The broadband digital active radio frequency decoy bomb as claimed in claim 2, characterized in that: The data processing board comprises: a digital-to-analog conversion unit, a data storage unit, and a control unit; wherein the digital-to-analog conversion unit comprises a digital-to-analog converter and an analog-to-digital converter; The data storage unit includes a data distributor and a memory, wherein the data distributor is used to convert the high-speed serial data obtained from the down-converter into low-speed parallel data matching the write time of the memory and store the data in a specified memory address, and the memory is used to store the processed waveform data; The control unit includes a controller for controlling the reading and writing of signal data in the memory.

4. The broadband digital active radio frequency decoy bomb as claimed in claim 3, characterized in that: The data distributor is also used to perform secondary modulation on at least one of the amplitude, phase and Doppler frequency deviation parameters of the waveform stored in the memory.

5. The broadband digital active radio frequency decoy bomb as claimed in claim 1, characterized in that: Also includes: A plurality of folding wings, each two folding wings forming a group, are arranged on one side of the thermal battery, wherein the first end of each folding wing is connected to the thermal battery, the second ends of the two folding wings located on the same side of the thermal battery are connected to each other, and after the broadband digital active radio frequency decoy is launched, the second end of the folding wing moves away from the other folding wing.

6. The broadband digital active radio frequency decoy bomb as claimed in claim 1, characterized in that: Also includes: An interference source is used to transmit an interference signal to an external target.

7. The broadband digital active radio frequency decoy bomb as claimed in claim 1, characterized in that: The rear end of the receiving antenna and the front end of the transmitting antenna are provided with polarization isolation components, and the polarization isolation components include an orthogonal mode converter.

8. The broadband digital active radio frequency decoy bomb as claimed in claim 1, characterized in that: Also includes: Infrared simulation source, used to simulate the target infrared characteristics through thermal radiation.

9. A jamming method using the broadband digital active radio frequency decoy bomb as claimed in any one of claims 1 to 8, characterized in that: Includes steps: An aircraft is provided with a broadband digital active radio frequency decoy flare, and the decoy flare is launched by a foil strip or an infrared decoy flare launcher on the aircraft to obtain a radar signal of an external target, wherein the radar signal has an original radio frequency frequency; The radar signal is connected to the decoy bomb through a receiving antenna in a high-isolation transceiver antenna; Amplifying the radar signal and converting it into a baseband signal through a broadband low-noise amplifier and a down-converter in sequence, wherein the baseband signal is a first analog signal; Converting the first analog signal into a first digital signal by a digital-to-analog converter, wherein the first digital signal is high-speed serial data; Using a data distributor to convert the first digital signal into a second digital signal matching the memory write time, and storing the second digital signal in a designated memory address, wherein the second digital signal is low-speed parallel data; The signal data stored in the memory is subjected to secondary modulation of amplitude, phase and Doppler frequency deviation parameters by the data distributor to obtain a third digital signal, wherein the third digital signal is low-speed parallel data; The third digital signal is read out by a controller in the decoy bomb; Using the data distributor to convert the third digital signal into a fourth digital signal, wherein the fourth digital signal is high-speed serial data; Converting the fourth digital signal into a second analog signal through an analog-to-digital converter; The second analog signal is converted into a signal with an original radio frequency through an up-converter; and the signal with the original radio frequency is sent to an external target through a transmitting antenna.

10. A method for increasing the instantaneous bandwidth of a broadband digital active radio frequency decoy according to any one of claims 1 to 8, characterized in that: Includes steps: The broadband digital active radio frequency decoy bomb receives an external radio frequency signal, the center frequency of the radio frequency signal is f MHz, and the bandwidth is B MHz; The external radio frequency signal is divided into two paths by a power divider in the broadband digital active radio frequency decoy: a first sub-signal and a second sub-signal, wherein the frequency of the first sub-signal is f1 and the frequency of the second sub-signal is f2; The local oscillator is controlled by the first frequency code to generate a frequency of f1=fB / 2MHz, and the local oscillator is controlled by the second frequency code to generate a frequency of f2=f+B / 2MHz. After processing, the input frequency ranges of the first sub-signal and the second sub-signal are [-B / 2, 0] and [0, B / 2] respectively; The first sub-signal and the second sub-signal are mixed into the same intermediate frequency signal with a bandwidth of B / 2 MHz.

11. A method for increasing the frequency band of a broadband digital active radio frequency decoy according to any one of claims 1 to 8, characterized in that: Includes steps: When the signal is input, the receiving antenna guides the received broadband bandwidth signal into the 90° bridge and divides it into two broadband radio frequency signals according to power, wherein the two broadband radio frequency signals include a first low frequency signal and a first high frequency signal; Mixing the first low-frequency signal and the first high-frequency signal into intermediate frequency signals with the same bandwidth and storing the signals; When the signal is output, the signal to be output includes a first intermediate frequency signal to be output as a low-frequency signal and a second intermediate frequency signal to be output as a high-frequency signal, the first intermediate frequency signal is a signal that can be directly processed by the analog-to-digital converter, and the first intermediate frequency signal is converted from a digital signal to an analog signal by the analog-to-digital converter to obtain the second low-frequency signal; Performing up-conversion signal processing on the second intermediate frequency signal through the local oscillator of the decoy bomb, modulating the second intermediate frequency signal into a second high frequency signal with the original radio frequency; Mixing the second low-frequency signal and the second high-frequency signal through a 90° bridge; The mixed signal is output through the transmitting antenna.

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