CN116413663A - Improved dense decoy spoofing interference generation method, device and storage medium - Google Patents
Improved dense decoy spoofing interference generation method, device and storage medium Download PDFInfo
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Abstract
The invention discloses an improved generation method, a device and a storage medium of intensive decoy spoofing interference, wherein the method comprises the following steps: according to the sampling wave gate and the dense false target parameters, obtaining a delay signal and a Doppler frequency offset signal through calculation; reading the stored corresponding radar signals according to the delay signals and taking the radar signals as forwarding signals; the Doppler frequency offset signal is used as a local oscillation signal required by digital up-conversion and is superposed on a forwarding signal, and then the forwarding signal subjected to superposition processing is modulated; determining a false target forwarding condition, and sending out a modulated forwarding signal according to the false target forwarding condition; and converting the modulated forwarding signal into an analog signal, wherein the analog signal is a false target signal. The secret false generation mechanism provided by the invention has the advantages that the distance interval between adjacent targets can be randomly changed, the interference difficulty of radar identification is increased, and the secret false generation mechanism can be suitable for pulse compression system radars with various complex signal waveforms.
Description
Technical Field
The invention relates to the field of radio electronic countermeasure, in particular to an improved dense decoy spoofing interference generation method, device and storage medium.
Background
Electronic countermeasure is a special combat means in modern wars, and is the fight of both parties to the use of control rights of space electromagnetic spectrum. The radar electronic battle (radar countermeasure) is an important component of the electronic battle, takes a system formed by a radar and the radar as a battle target, takes a radar jammer, a radar reconnaissance machine and the like as main battle equipment, utilizes the forms of electromagnetic wave emission, absorption, reflection, transmission, reception, processing and the like to develop work, and is a battle behavior for reconnaissance and suppressing the use right of the electromagnetic spectrum of the enemy and enhancing the use effectiveness of the electromagnetic spectrum of the me.
With the advancement of digital technology, the development of high performance devices has resulted in the formation of Digital Radio Frequency Memory (DRFM) based interference techniques. The method can perform undistorted sampling and coherent storage on the intercepted radar pulse signals, then perform accurate copying and reproduction, and then forward the intercepted radar pulse signals after delay and modulation, so that interference signals which are the same as the actual target can be generated, and effective interference can be performed on the radar. There are many ways in which radar can interfere, a dense decoy being one of the more common and easy ways to implement. The generation of dense decoys can be summarized as 4 classes: the method comprises the steps of time delay superposition of multiple decoys, convolution of the multiple decoys, intermittent sampling forwarding of the multiple decoys and interception of part of pulse forwarding of the multiple decoys, wherein interception of part of pulse forwarding of the multiple decoys is a method which is more commonly used in engineering.
With the rapid development of advanced technologies such as microelectronics technologies, some new system radars are widely applied, for example, pulse compression radars, synthetic aperture radars, and the like. Most of the new system radars comprehensively adopt signal processing technologies such as coherent receiving processing, matched filtering and the like, and particularly adopt signal waveforms of intra-pulse coherence and inter-pulse coherence, so that when an interference signal which is not matched with a radar radio frequency signal waveform is received, the interference signal cannot obtain ideal processing gain at a radar receiving end, and the radar interference cannot achieve good suppressing effect or deception effect. Meanwhile, the radar increases the difficulty of sorting and identifying the jammers through complex modulation, frequency agility, period jitter, pulse shielding and the like of waveform parameters, and realizes low interception of waveform emission.
The above conventional method for intercepting part pulse forwarding dense decoys has the following defects:
1. the interference of the traditional interception part pulse forwarding dense false target on the complex-waveform-parameter modulation radar is poor, the distance interval of the traditional interception part pulse forwarding dense false target is fixed and cannot change along with the change of pulse width, if the distance interval is arranged closer, the problem that the signal forwarding is incomplete when the pulse width is larger is solved, the false target interference is not easy to form, and the interference effect is reduced.
2. The distance interval between all adjacent two targets of the traditional intercepting part pulse forwarding dense false target is unchanged, the regularity is strong, the current interference type is easy to be analyzed by a radar, and the interference is eliminated by adopting a corresponding anti-interference technology;
3. the traditional intercepting part pulse forwarding dense decoys usually have the advantages that targets cannot move, the existing radar basically has the moving target detection function, and if the targets do not move, the radar can easily kick off the decoys.
Disclosure of Invention
The technical purpose is that: aiming at the technical problems, the invention provides an improved dense false target deception jamming generation method, device and storage medium, wherein the dense false target deception jamming generation mechanism provided by the invention can randomly change the distance interval between adjacent targets, increases the difficulty of radar recognition jamming, and can be suitable for various pulse compression system radars with complex signal waveforms.
The technical scheme is as follows: in order to achieve the technical purpose, the invention adopts the following technical scheme:
an improved generation method of intensive decoy spoofing interference is characterized by comprising the following steps:
receiving a sampling wave gate and a matching wave gate, and storing radar signals according to the sampling wave gate;
receiving a control message required by the generation of the dense false target;
analyzing the control message to obtain dense false target parameters including initial position, end position, speed, acceleration, set distance interval and forwarding pulse number;
according to the sampling wave gate and the dense false target parameters, a delay signal and a Doppler frequency offset signal are obtained through calculation;
reading the stored corresponding radar signals according to the delay signals and taking the radar signals as forwarding signals;
generating local oscillation signals required by digital up-conversion according to Doppler frequency offset signals, and superposing the local oscillation signals on a transmitting signal;
modulating the amplitude, frequency or noise of the superimposed forwarding signal;
determining a false target forwarding condition according to the pulse width, the frequency, the sampling wave gate and the matching wave gate of the radar signal, and sending out a modulated forwarding signal according to the false target forwarding condition;
and converting the modulated forwarding signal into an analog signal, wherein the analog signal is a false target signal.
Preferably, according to the sampling wave gate and the matching wave gate, determining an interference wave gate for forwarding the false target, starting timing when the upper edge of the sampling wave gate is detected, starting forwarding the first false target signal when the timing value is equal to the delay value, forwarding the false target signal every other forwarding distance interval until the forwarding quantity reaches the forwarding pulse number in the control message, and stopping forwarding;
if the measured pulse width and frequency are in the set numerical range, a matched wave gate with preset duration is given, and the interference wave gate starts to be pulled up at the rising edge of the matched wave gate with preset duration until a new sampling wave gate rising edge is detected, and the interference wave gate is pulled down.
Preferably, if the false target has speed and acceleration, the distance of the false target closest to the sampling wave gate is calculated in real time, the initial distance is updated by the calculated distance, and the delay value, the forwarded distance interval and the Doppler frequency offset signal are re-calculated.
Preferably, the delay signal includes a delay value and a delay distance interval of the forwarding signal, and the dense decoy parameter further includes: distance interval jitter range and dwell time;
the delay value is determined according to an initial position in the dense false target parameter, a preset distance interval, a distance interval jitter range and the number of forwarding pulses;
the forwarded distance interval is obtained according to the preset distance interval, the distance interval jitter range and the random number in the dense false target parameters, and is calculated according to the formula (1):
D1＝D×[1+(2r-1)*T] (1)
wherein D1 represents a delay distance interval, D represents a preset distance interval, r represents a random number in a range of 0-1, T represents a distance interval jitter range, and the value of T is 0-50%.
Preferably, the delay signal includes a delay value and a delay distance interval of the forwarding signal, and the dense decoy parameter further includes: adaptive pulse width and adaptive ratio;
the delay value is determined according to the initial position, the sampling gate length, the self-adaptive proportion and the number of the forwarding pulses;
the distance interval of the forwarding is determined according to the sampling wave gate and the self-adaptive proportion.
Preferably, the radar signal is generated by intercepting an external radar signal and performing analog-to-digital processing;
the dense decoy parameters further include: whether the output power, power type, power heave type, distance interval type, distance speed are related.
The utility model provides an intensive decoy spoofing jamming generating device of improved generation which characterized in that includes FPGA unit and memory chip, the FPGA unit includes:
the receiving module is used for receiving the sampling wave gate and the matching wave gate and storing radar signals according to the sampling wave gate;
the SPI module is used for receiving the control message required by the generation of the dense false target;
the analysis module analyzes the control message to obtain dense false target parameters including initial position, termination position, speed, acceleration, set distance interval and forwarding pulse number;
the pulse width measurement module is used for judging whether the condition of sending out the dense false target is met or not according to the pulse information of the received radar signal after the analog-to-digital conversion;
the resolving module is used for resolving to obtain a delay signal and a Doppler frequency offset signal according to the sampling wave gate and the dense false target parameters;
the data storage and reading control module is used for acquiring a delay signal of data and a power attenuation value of the amplitude of the control signal, and reading a stored corresponding radar signal according to the delay signal and taking the radar signal as a forwarding signal;
the forwarding module is used for determining false target forwarding conditions according to the pulse width, the frequency, the sampling wave gate and the matching wave gate of the radar signal and sending out a modulated forwarding signal according to the false target forwarding conditions;
the processing module comprises a DDS_CORE module for generating local oscillation signals required by digital up-conversion according to Doppler frequency offset signals, a mixing module for superposing the local oscillation signals on the forwarding signals, a modulation module for modulating the amplitude, frequency or noise of the superposed forwarding signals, and an analog-to-digital conversion module for converting the modulated forwarding signals into analog signals, wherein the analog signals are false target signals.
Preferably, the device further comprises a control unit for intercepting an external radar signal, performing analog-to-digital conversion on the intercepted radar signal, generating a control message required by dense false target generation according to the radar signal after analog-to-digital conversion, and sending a sampling wave gate, a matching wave gate and the control message to the FPGA unit;
the control unit is used for calculating a matched wave gate meeting the time length requirement in real time according to the pulse information of the radar signal, determining according to the speed and the acceleration of the target, calculating the distance of a false target closest to the current sampling wave gate in real time, updating the initial distance by the calculated distance, and sending the initial distance to the FPGA unit.
Preferably, the device further comprises a microwave frequency conversion assembly and an attenuator, and the power attenuation value is used for controlling the attenuator at the rear end of the microwave frequency conversion assembly.
A storage medium for storing a computer program; wherein the computer program when executed by a processor implements the method.
The beneficial effects are that: due to the adoption of the technical scheme, the invention has the following beneficial effects:
(1) Compared with the traditional dense false targets, the radar has the advantages that the target distance interval is fixed, the target distance interval can be changed along with the change of pulse width, and the interference resistance difficulty of the radar is increased;
(2) The distance interval between adjacent targets can be randomly changed, so that the radar identification interference difficulty is increased, and the radar anti-interference difficulty is improved;
(3) The radar can adapt to various pulse compression system radars with complex signal waveforms;
(4) The requirements on the reconnaissance and sorting capability of the jammer are low, and the engineering implementation is simple;
(5) According to the measured pulse width and frequency, whether the current radar signal is interfered can be rapidly determined through controlling the matched wave gate;
(6) The repeated signals are superimposed with noise, and the suppression effect of aiming frequency noise can be realized without frequency measurement.
Drawings
FIG. 1 is a flow chart of an improved dense decoy fraud generation method according to an embodiment;
FIG. 2 is a block diagram of an improved dense decoy fraud generation apparatus according to a second embodiment;
FIG. 3 is a timing diagram first of a specific generation of distance interval random dense decoys;
FIG. 4 is a parametric solution simulation diagram of a distance interval random dense decoy mechanism;
FIG. 5 is a second timing diagram of the specific generation of adaptive pulse width dense decoys;
fig. 6 is a parametric solution simulation of an adaptive pulse width random dense decoy mechanism.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
As shown in fig. 1, the present embodiment proposes an improved generation method of dense decoy spoofing interference, which includes the steps of:
receiving a sampling wave gate and a matching wave gate, and storing radar signals according to the sampling wave gate;
receiving a control message required by the generation of the dense false target;
analyzing the control message to obtain dense false target parameters including initial position, end position, speed, acceleration, set distance interval and forwarding pulse number;
according to the sampling wave gate and the dense false target parameters, a delay signal and a Doppler frequency offset signal are obtained through calculation;
reading the stored corresponding radar signals according to the delay signals and taking the radar signals as forwarding signals;
generating local oscillation signals required by digital up-conversion according to Doppler frequency offset signals, and superposing the local oscillation signals on a transmitting signal;
modulating the amplitude, frequency or noise of the superimposed forwarding signal;
determining a false target forwarding condition according to the pulse width, the frequency, the sampling wave gate and the matching wave gate of the radar signal, and sending out a false target signal according to the false target forwarding condition;
and converting the modulated forwarding signal into an analog signal, wherein the analog signal is a false target signal.
The motion track of the dense false target signal moves from an initial position to a final position, and the distance interval between the initial position and the final position is determined by a delay signal.
The radar signal after analog-to-digital conversion is generated by intercepting an external radar signal and performing analog-to-digital processing; the control message is generated according to the radar signal after analog-to-digital conversion.
Determining an interference wave gate for forwarding the false target according to the sampling wave gate and the matching wave gate, starting timing when the upper edge of the sampling wave gate is detected, starting forwarding the first false target signal when the timing value is equal to the delay value, forwarding the false target signal every other forwarding distance interval until the forwarding quantity reaches the forwarding pulse number in the control message, and stopping forwarding;
if the pulse width and the frequency of the measured radar signal are in the set numerical range, a matched wave gate with preset duration is given, and the interference wave gate starts to be pulled up at the rising edge of the matched wave gate with preset duration until a new sampling wave gate rising edge is detected, and the interference wave gate is pulled down.
If the false target has speed and acceleration, the distance of the false target closest to the sampling wave gate is calculated in real time, the initial distance is updated by the calculated distance, and the delay value, the forwarded distance interval and the Doppler frequency offset signal are re-calculated.
Example two
The embodiment provides an improved dense decoy spoofing interference generating device, which can be used for the method in the first embodiment, and the device comprises an FPGA unit and a memory chip.
The FPGA unit includes:
the receiving module is used for receiving the sampling wave gate and the matching wave gate and storing radar signals according to the sampling wave gate;
the SPI module is used for receiving the control message required by the generation of the dense false target;
the analysis module analyzes the control message to obtain dense false target parameters including initial position, termination position, speed, acceleration, set distance interval and forwarding pulse number;
the pulse width measurement module is used for judging whether the condition of sending out the dense false target is met or not according to the pulse information of the received radar signal after the analog-to-digital conversion;
the resolving module is used for resolving to obtain a delay signal and a Doppler frequency offset signal according to the sampling wave gate and the dense false target parameters;
the data storage and reading control module is used for acquiring a delay signal of data and a power attenuation value of the amplitude of the control signal, and reading a stored corresponding radar signal according to the delay signal and taking the radar signal as a forwarding signal;
the forwarding module is used for determining false target forwarding conditions according to the pulse width, the frequency, the sampling wave gate and the matching wave gate of the radar signal and sending out a modulated forwarding signal according to the false target forwarding conditions;
the processing module comprises a DDS_CORE module for generating local oscillation signals required by digital up-conversion according to Doppler frequency offset signals, a mixing module for superposing the local oscillation signals on the forwarding signals, a modulation module for modulating the amplitude, frequency or noise of the superposed forwarding signals, and an analog-to-digital conversion module for converting the modulated forwarding signals into analog signals, wherein the analog signals are false target signals.
Specifically, the device also comprises a control unit, a digital-to-analog conversion chip, an analog-to-digital conversion chip and a clock fan-out chip.
The control unit is used for intercepting an external radar signal, carrying out analog-to-digital conversion on the intercepted radar signal, generating a control message required by the generation of a dense false target according to the radar signal after the analog-to-digital conversion, and sending a sampling wave gate, a matching wave gate and the control message to the FPGA unit; and the method is also used for calculating the matched wave gate meeting the time length requirement in real time according to the pulse information of the radar signal, determining according to the speed and the acceleration of the target, calculating the distance of the false target closest to the sampling wave gate in real time, updating the initial distance by using the calculated distance, and sending the initial distance to the FPGA unit.
The parameters of the dense false target mainly comprise parameters such as sampling wave gate, matching wave gate, output power, power type, power fluctuation type, initial position, end position, set distance interval, target speed, target acceleration, forwarding pulse number, distance interval type, distance interval jitter range, residence time, whether the distance speed is relevant, target Doppler frequency shift, self-adaptive pulse width, self-adaptive ratio and the like. These parameters are usually preset by human beings, and some parameters are selected for use according to the type of the password.
The embodiment can realize 3 generation mechanisms, which are respectively: conventional secret-false, self-adaptive pulse width secret-false and distance interval random secret-false. The latter two mechanisms are described in detail below as examples.
The general block diagram of this embodiment is shown in fig. 2. The specific implementation flow is as follows: the FPGA stores the external radar signals after AD conversion into a memory chip through a sampling wave gate given by a GPIO receiving control unit; receiving signals in real time through SPI to generate a required control message; after receiving the control message, analyzing the control message to obtain parameters required by the generation of the dense false target signal, then carrying out correlation calculation on various parameters to obtain Doppler (FD) signals required by the generation of the dense false signal, and storing delay signals of read data and power attenuation values of the amplitude of the control signal in the chip.
The FD signal controls the DDS_CORE module to generate a digital FD signal as a local oscillation signal required by digital up-conversion, realizes superposition of the FD signal on a transfer signal, and the delay signal is used for controlling a memory chip to read out an analog-digital converted radar signal and then carries out modulation processing on the signal such as amplitude, frequency, noise and the like; and finally, sending the modulated signal to a digital-to-analog conversion module, controlling the digital-to-analog conversion chip to convert the digital signal into an analog signal, and controlling an attenuator at the rear end of the microwave frequency conversion assembly by using the power attenuation value, thereby realizing the control of the power of the signal.
As shown in fig. 2, the present embodiment also has a channelized receiving module, a digital frequency measuring module, a PDW (Pulse DescriptionWrod, pulse description word) module, etc. for realizing the functions of channelized frequency measurement, system key component status monitoring, and PDW information uploading to the control unit through the SPI.
1. Distance interval random dense decoy generation mechanism
The FPGA detects a sampling wave gate signal given by the control unit, stores the radar signal according to the sampling wave gate, calculates a delay value of a transfer signal according to an initial position, a set distance interval, a distance interval random range and a transfer pulse number, and calculates the transfer distance interval according to the set distance interval and the distance interval random range, wherein the calculation formula is as follows:
d1 =d× [1+ (2 r-1) T ] formula 1
Wherein: d1—distance interval of forwarding; d—the distance interval set is a preset value, and is generally set to be greater than 150m; r-0-1 random number T-random range 0-50%.
When the upper edge of the sampling wave gate is detected, starting to count time, when the count time value is equal to the delay value converted by the initial distance, starting to forward the first signal, and forwarding once every distance interval until the number of forwarding pulses is equal to the set value, and stopping forwarding the signal. The same random number is used for the dwell time, and after the expiration, the timer is re-timed and a new random number is used.
The system simulates a plurality of false targets, and the speed and the acceleration are preset self characteristics of the false targets. If the speed and the acceleration exist in the target (i.e. the forwarded false target), the control unit calculates the distance of the current nearest target (i.e. the target closest to the sampling wave gate) in real time, and sends the calculated Doppler frequency offset according to the speed to the FPGA as a new initial distance for re-calculation, and the Doppler frequency offset is superimposed on the forwarded signal, wherein the target movement range is between an initial position and a final position, and the initial position is moved to the final position. The termination position is a preset value. "present" means that the velocity is not equal to 0, can be positive or negative, and the acceleration is greater than 0. If the false target does not move, the target delay forwarded each time is fixed.
Whether the signal is forwarded or not is determined by the control unit according to the measured pulse width and the measured frequency of the radar signal, if the measured pulse width and the measured frequency are in a set numerical range, the control unit gives a matched wave gate with a certain duration, and when the FPGA detects the rising edge of the matched wave gate, the interference wave gate starts to be pulled up until a new sampling wave gate rising edge interference wave gate is detected to be pulled down. The specific generation timing of the distance interval random dense decoys is shown in fig. 3.
In fig. 3: t1: sampling delay, t2: sampling duration, t3: matching delay, t4: interference duration, t5: delay calculated from termination distance, t6: time delay calculated from the solved distance interval, t7: and a delay calculated from the starting distance.
Fig. 4 is a simulation diagram of a distance interval random dense false target parameter calculation, in which distance_interval_tpye is a distance interval type selection signal, and when the distance interval is 1, the distance interval is randomly changed, and when the distance interval is 0, the distance interval is a fixed value. The change_ratio is a random range, the distance_interval_duration is a residence time of a random number used when the distance interval is calculated randomly, the interval_origin_distance is a set initial distance, if the target is moving, the parameter is calculated in real time by the control unit and sent to the FPGA through a message, the interval_distance_interval is a set distance interval, the interval_counter_freq is a Doppler frequency offset value calculated according to the target speed, the interval_pulse_num is a number of forwarded pulses, namely, the number of forwarded targets, and the radius_syn_in is a sampling wave gate, the target_syn_del is a control signal for reading data of the memory chip, the target_strobe is a data synchronous detection signal read from the memory chip, the signal is 1 and indicates that the data is valid, the target_pa_code is an attenuation code of the signal and is used for controlling an attenuator of the microwave frequency conversion component so as to control the amplitude of the signal, the target_syn_dop is a local oscillation signal required for controlling the DDS_CORE module to generate digital up-conversion, the target_doppler_out is a frequency control word of the DDS_COR module, and the data is valid when the target_syn_dop is 1.
2. Adaptive pulse width dense decoy generation mechanism
The FPGA detects a sampling wave gate signal given by the control unit, stores the radar signal according to the sampling wave gate, measures the length of the sampling wave gate, calculates the delay value of the forwarding signal according to the initial position, the length of the sampling wave gate, the self-adaptive proportion and the forwarding pulse number, the forwarding distance interval is the product of the sampling wave gate and the self-adaptive proportion, starts timing when the upper edge of the sampling wave gate is detected, starts forwarding the first signal when the timing value is equal to the delay value calculated by the initial distance conversion, and forwards the first signal once every other forwarding distance interval until the forwarding pulse number is equal to the set value, and stops forwarding the signal.
If the speed and the acceleration exist in the target, the control unit calculates the distance of the current nearest target in real time, and sends the distance to the FPGA as a new initial distance for re-calculation, and meanwhile, doppler frequency offset calculated according to the speed is given and is superimposed on the forwarded signal, the target movement range is between an initial position and a final position, and the target movement range is moved from the initial position to the final position.
Whether the signal is forwarded or not is determined by the control unit according to the measured pulse width and the frequency, if the measured pulse width and the frequency are in a set numerical range, the control unit gives a matched wave gate with a certain duration, and when the FPGA detects the rising edge of the matched wave gate, the interference wave gate starts to be pulled up until a new sampling wave gate rising edge interference wave gate is detected to be pulled down. The specific generation timing of the adaptive pulse width dense decoys is shown in fig. 4.
In the self-adaptive pulse width dense false target generation mechanism, the self-adaptation is reflected in that the forwarded distance interval is calculated according to the actually measured pulse width, the pulse width is changed, and the forwarded distance interval is changed along with the pulse width. The principle is that the detection and sampling wave gate phase of the actual radar signal takes a smaller value, the pulse width measuring module measures the value in a counting mode, and then a new value is obtained by multiplying a certain proportion coefficient, and the value is multiplied by 150 to obtain the parameter distance interval. The adaptive scale is typically set manually, according to the number of decoys to be generated. For the radar waveform with variable pulse width, more false targets can be formed when the pulse width is small, the forwarded false target pulse width is also increased when the pulse width is large, and the number of targets is reduced, but the radar is more easily considered as the false targets, and the number of the false targets can be increased in a delay superposition mode.
The adaptive pulse width dense decoy generation mechanism generates the timing shown in fig. 5.
In fig. 5: t1: sampling delay, t2: sampling duration, t3: matching delay, t4: interference duration, t5: time delay calculated from the starting distance, t6: time delay calculated from distance interval, t7: and the delays calculated by the termination distances are all delay signals, and t5, t6 and t7 are used for judging with t 5.
Fig. 6 is a simulation diagram of adaptive pulse width random dense false target parameter calculation, in which distance_interval_tpye is a distance interval type selection signal, and when the distance interval is 1, the distance interval is randomly changed, and when the distance interval is 0, the distance interval is a fixed value. The change_ratio is a random range, the distance_interval_duration is a residence time of a random number used when the distance interval is calculated randomly, the interval_origin_distance is a set initial distance, if the target is moving, the parameter is calculated in real time by the control unit and sent to the FPGA through a message, the interval_distance_interval is a distance interval parameter, it can be seen from fig. 6 that when the sampling wave gate signal radar_syn_in is changed, the parameter is changed accordingly, the interval_counter_freq is a doppler frequency offset value calculated according to the target speed, the interval_pulse_number is a forwarding pulse number, namely, the number of the targets to be forwarded is the sampling wave gate, the target_syn_del is a control signal for reading the data of the memory chip, the target_strobe is a data synchronous detection signal read from the memory chip, the signal is 1 and indicates that the data is valid, the target_pa_code is an attenuation code of the signal and is used for controlling an attenuator of the microwave frequency conversion assembly, so that the control of the signal amplitude is realized, the target_syn_dop is a local oscillation signal required for controlling the DDS_CORE module to generate digital up-conversion, and the target_doppler_out is a frequency control word of the DDS_COR module, and when the target_syn_dop is 1, the data is valid.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (10)
1. An improved generation method of intensive decoy spoofing interference is characterized by comprising the following steps:
receiving a sampling wave gate and a matching wave gate, and storing radar signals according to the sampling wave gate;
receiving a control message required by the generation of the dense false target;
analyzing the control message to obtain dense false target parameters including initial position, end position, speed, acceleration, set distance interval and forwarding pulse number;
according to the sampling wave gate and the dense false target parameters, a delay signal and a Doppler frequency offset signal are obtained through calculation;
reading the stored corresponding radar signals according to the delay signals and taking the radar signals as forwarding signals;
generating local oscillation signals required by digital up-conversion according to Doppler frequency offset signals, and superposing the local oscillation signals on a transmitting signal;
modulating the amplitude, frequency or noise of the superimposed forwarding signal;
determining a false target forwarding condition according to the pulse width, the frequency, the sampling wave gate and the matching wave gate of the radar signal, and sending out a modulated forwarding signal according to the false target forwarding condition;
and converting the modulated forwarding signal into an analog signal, wherein the analog signal is a false target signal.
2. The improved dense decoy spoofing interference generating method of claim 1 wherein the decoy forwarding conditions are determined by:
determining an interference wave gate for forwarding the false target according to the sampling wave gate and the matching wave gate, starting timing when the upper edge of the sampling wave gate is detected, starting forwarding the first false target signal when the timing value is equal to the delay value, forwarding the false target signal every other forwarding distance interval until the forwarding quantity reaches the forwarding pulse number in the control message, and stopping forwarding;
if the measured pulse width and frequency are in the set numerical range, a matched wave gate with preset duration is given, and the interference wave gate starts to be pulled up at the rising edge of the matched wave gate with preset duration until a new sampling wave gate rising edge is detected, and the interference wave gate is pulled down.
3. An improved dense decoy fraud prevention method according to claim 1, characterized by:
if the false target has speed and acceleration, the distance of the false target closest to the sampling wave gate is calculated in real time, the initial distance is updated by the calculated distance, and the delay value, the forwarded distance interval and the Doppler frequency offset signal are re-calculated.
4. An improved dense decoy fraud prevention method according to claim 1, characterized by: the delay signal comprises a delay value and a delay distance interval of the forwarding signal, and the dense decoy parameter further comprises: distance interval jitter range and dwell time;
the delay value is determined according to an initial position in the dense false target parameter, a preset distance interval, a distance interval jitter range and the number of forwarding pulses;
the forwarded distance interval is obtained according to the preset distance interval, the distance interval jitter range and the random number in the dense false target parameters, and is calculated according to the formula (1):
D1＝D×[1+(2r-1)*T] (1)
wherein D1 represents a delay distance interval, D represents a preset distance interval, r represents a random number in a range of 0-1, T represents a distance interval jitter range, and the value of T is 0-50%.
5. An improved dense decoy fraud prevention method according to claim 1, characterized by: the delay signal comprises a delay value and a delay distance interval of the forwarding signal, and the dense decoy parameters further comprise: adaptive pulse width and adaptive ratio;
the delay value is determined according to the initial position, the sampling gate length, the self-adaptive proportion and the number of the forwarding pulses;
the distance interval of the forwarding is determined according to the sampling wave gate and the self-adaptive proportion.
6. An improved dense decoy fraud prevention method according to claim 1, characterized by:
the radar signal is generated by intercepting an external radar signal and performing analog-to-digital processing;
the dense decoy parameters further include: whether the output power, power type, power heave type, distance interval type, distance speed are related.
7. The utility model provides an intensive decoy spoofing jamming generating device of improved generation which characterized in that includes FPGA unit and memory chip, the FPGA unit includes:
the receiving module is used for receiving the sampling wave gate and the matching wave gate and storing radar signals according to the sampling wave gate;
the SPI module is used for receiving the control message required by the generation of the dense false target;
the analysis module analyzes the control message to obtain dense false target parameters including initial position, termination position, speed, acceleration, set distance interval and forwarding pulse number;
the pulse width measurement module is used for judging whether the condition of sending out the dense false target is met or not according to the pulse information of the received radar signal after the analog-to-digital conversion;
the resolving module is used for resolving to obtain a delay signal and a Doppler frequency offset signal according to the sampling wave gate and the dense false target parameters;
the data storage and reading control module is used for acquiring a delay signal of data and a power attenuation value of the amplitude of the control signal, and reading a stored corresponding radar signal according to the delay signal and taking the radar signal as a forwarding signal;
the forwarding module is used for determining false target forwarding conditions according to the pulse width, the frequency, the sampling wave gate and the matching wave gate of the radar signal and sending out a modulated forwarding signal according to the false target forwarding conditions;
the processing module comprises a DDS_CORE module for generating local oscillation signals required by digital up-conversion according to Doppler frequency offset signals, a mixing module for superposing the local oscillation signals on the forwarding signals, a modulation module for modulating the amplitude, frequency or noise of the superposed forwarding signals, and an analog-to-digital conversion module for converting the modulated forwarding signals into analog signals, wherein the analog signals are false target signals.
8. The improved dense decoy fraud generating apparatus of claim 7, wherein: the device also comprises a control unit, a sampling gate, a matching gate and a control message, wherein the control unit is used for intercepting an external radar signal, performing analog-to-digital conversion on the intercepted radar signal, generating a control message required by the generation of a dense false target according to the radar signal after the analog-to-digital conversion, and sending the sampling gate, the matching gate and the control message to the FPGA unit;
the control unit is used for calculating a matching wave gate meeting the time length requirement in real time according to the pulse information of the radar signal, determining according to the speed and the acceleration of the false target, calculating the distance of the false target closest to the sampling wave gate in real time, updating the initial distance by the calculated distance, and sending the initial distance to the FPGA unit.
9. The improved dense decoy fraud generating apparatus of claim 8, wherein: the device also comprises a microwave frequency conversion assembly and an attenuator, wherein the power attenuation value is used for controlling the attenuator at the rear end of the microwave frequency conversion assembly.
10. A storage medium for storing a computer program; wherein the computer program when executed by a processor implements the method according to any of claims 1 to 6.
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