CN111505589A - Inter-pulse coherent false target interference method and device and computer equipment - Google Patents

Inter-pulse coherent false target interference method and device and computer equipment Download PDF

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CN111505589A
CN111505589A CN202010315516.0A CN202010315516A CN111505589A CN 111505589 A CN111505589 A CN 111505589A CN 202010315516 A CN202010315516 A CN 202010315516A CN 111505589 A CN111505589 A CN 111505589A
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signal
doppler
modulation
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frequency
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CN111505589B (en
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徐先武
教亚飞
柴进
彭攀
唐石画
彭超
刘伟林
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Hunan Cyber Electronic Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/38—Jamming means, e.g. producing false echoes

Abstract

The application relates to a pulse coherent false target interference method, a pulse coherent false target interference device and computer equipment. The method comprises the following steps: generating a digital IQ local oscillator signal according to a preset digital center frequency, obtaining an intermediate frequency real signal of a radar to be interfered according to a current local oscillator signal and a radio frequency input signal, carrying out IQ demodulation on the intermediate frequency real signal according to the digital IQ local oscillator signal to obtain an IQ demodulation signal, obtaining a radar frequency of the radar to be interfered according to the intermediate frequency real signal, calculating a Doppler signal corresponding to a false target and a distance delay of the false target according to a preset false target initial distance, an initial speed and the radar frequency, then obtaining a Doppler IQ modulation signal through Doppler modulation, phase correction and IQ modulation in sequence, and obtaining a radio frequency output signal corresponding to the false target according to the Doppler IQ modulation signal and the current local oscillator signal. By adopting the method, the radio frequency signal for accurately simulating the false target can be generated.

Description

Inter-pulse coherent false target interference method and device and computer equipment
Technical Field
The application relates to the technical field of radar interference, in particular to a method and a device for inter-pulse coherent false target interference and computer equipment.
Background
By means of the scattering and the transmission of the radiation electromagnetic wave in the space, the radar can acquire interested target information all weather and all the time under various meteorological conditions, and is widely applied to the fields of air/sea report monitoring, weapon guidance, firepower command and control and the like. The attainment of modern military operations and the exertion of military strength rely to a large extent on radar as the "eye".
In order to weaken the effect of radar, radar interference occurs, and generally, radar interference can be divided into two main categories, namely passive interference and active interference. Wherein, a plurality of interference energy is derived from backscattering of radar radiation signals by non-interested targets, and is called passive interference, such as foil strips, corner reflectors and the like; if the interference energy is generated by other radiation sources than the radar radiation signal, it is called active interference. The active interference is characterized in that the active interference is used for searching, intercepting, measuring and analyzing radar signals in the reconnaissance airspace by means of a reconnaissance receiver, has the advantages of multiple interference patterns, flexible and changeable interference modes and the like, and is the mainstream development direction of radar interference.
Most of the current radar active interference is based on a Digital Radio Frequency Memory (DRFM) principle, the radar active interference firstly scootes and receives signals transmitted by enemy radar, stores signal data, analyzes basic parameters, and then carries out interference modulation and forwarding on the signal data. However, for a plurality of PRIs, the phase relationship between the moving false target pulses does not necessarily conform to the doppler phase relationship, and the details may cause the delay variation law of the false target not to match the slow time doppler relationship, which finally results in the false target being removed by the anti-interference algorithm and losing the effect of deception interference.
Disclosure of Invention
Therefore, in order to solve the above technical problem, it is necessary to provide a method, an apparatus and a computer device for inter-pulse coherent decoy interference, which can solve the problem that the delay variation law of the decoy is not matched with the slow time doppler relationship during interference.
A method of inter-pulse coherent decoy jamming, the method comprising:
generating a digital IQ local oscillator signal according to a preset digital center frequency;
obtaining an intermediate frequency real signal of the radar to be interfered according to the current local oscillation signal and the radio frequency input signal;
performing IQ demodulation on the intermediate-frequency real signal according to the digital IQ local oscillator signal to obtain an IQ demodulation signal;
obtaining the radar frequency of the radar to be interfered according to the intermediate-frequency real signal, and calculating to obtain a Doppler signal corresponding to a false target and the distance delay of the false target according to the preset false target initial distance, initial speed and the radar frequency;
according to the Doppler signal, performing Doppler modulation on the IQ demodulation signal to obtain a Doppler modulation signal representing the initial phase change and Doppler frequency offset between false target pulses;
correcting the Doppler modulation signal according to the distance delay to obtain a corrected Doppler modulation signal;
carrying out IQ modulation according to the digital IQ local oscillator signal and the corrected Doppler modulation signal to obtain a Doppler IQ modulation signal;
and obtaining a radio frequency output signal corresponding to the false target according to the Doppler IQ modulation signal and the current local oscillation signal.
In one embodiment, the method further comprises the following steps: according to the preset digital center frequency, generating a digital IQ local oscillator signal as follows:
Ir＝cos(2πfrt)
Qr＝-sin(2πfrt)
wherein, IrI-way signal, Q, representing digital IQ local oscillator signalrQ-way signal, f, representing a digital IQ local oscillator signalrRepresenting the digital center frequency.
In one embodiment, the method further comprises the following steps: performing IQ dot multiplication on the intermediate frequency real signal according to the digital IQ local oscillator signal to obtain an IQ dot multiplied signal:
Im＝Ir*Iin
Qm＝Qr*Iin
wherein, ImRepresenting the I-path signal, Q, in an IQ dot product signalmRepresenting the Q-path signal, I, in an IQ dot product signalinRepresenting real signals of intermediate frequency, pair ImFiltering the signal to obtain an I-path signal I of an IQ demodulation signalmfTo Q, pairmQ-path signal Q of IQ demodulation signal obtained by filtering signalmf。
In one embodiment, the method further comprises the following steps: according to the intermediate frequency real signal, obtaining the radar frequency of the radar to be interfered as follows:
fradar＝fc+f0
wherein f isradarRepresenting radar frequency, fcIndicating the frequency, f, corresponding to the current local oscillator signal0Representing the frequency corresponding to the intermediate frequency real signal;
according to the preset false target initial distance, initial speed and the radar frequency, calculating to obtain a Doppler value corresponding to a false target as follows:
Figure BDA0002459424280000031
wherein f isdRepresents the doppler value, c represents the speed of light, v represents the initial speed;
and generating the doppler signal as:
Figure BDA0002459424280000032
Figure BDA0002459424280000033
wherein, IdI-path signal, Q, representing a Doppler signaldQ-path signals representing Doppler signals, lambda represents the wavelength corresponding to the Doppler value, and t represents continuous time;
according to the preset initial distance and initial speed of the false target, calculating the current distance delay of the false target as follows:
Figure BDA0002459424280000034
wherein R represents an initial distance.
In one embodiment, the method further comprises the following steps: according to the Doppler signal, Doppler modulation is carried out on the IQ demodulation signal, and the Doppler modulation signal which represents the initial phase change and Doppler frequency offset between false target pulses is obtained as follows:
Id1＝Imf*Id+Qmf*Qd
Qd1＝Qmf*Id-Imf*Qd
wherein, ImfRepresenting the filtered signal of the I-path signal in the IQ demodulated signal, QmfRepresents a signal obtained by filtering a Q-path signal in an IQ demodulated signal, Id1I-path signal, Q, representing a Doppler modulated signald1Representing the Q-path signal to the doppler modulated signal.
In one embodiment, the method further comprises the following steps: and according to the distance delay, obtaining a correction signal as follows:
Ijz＝cos(2π(fc+fr)τn)
Qjz＝-sin(2π(fc+fr)τn)
wherein, IjzI-way signal, Q, representing correction signaljzA Q-path signal representing a correction signal;
according to the correction signal, correcting the Doppler modulation signal to obtain a corrected Doppler modulation signal:
Id2＝Id1*Ijz+Qd1*Qjz
Qd2＝Qd1*Ijz-Id1*Qjz
wherein, Id2I-path signal, Q, representing a modified Doppler modulated signald2A Q-path signal representing the modified doppler modulated signal.
In one embodiment, the method further comprises the following steps: according to the digital IQ local oscillator signal, constructing a time delay digital IQ local oscillator signal as follows:
Ir2＝cos(2πfrt-2πfrτ1)
Qr2＝-sin(2πfrt-2πfrτ1)
wherein, tau1Representing the current range delay of the decoy, Ir2I-path signal, Q, representing a time-delayed digital IQ local oscillator signalr2A Q-path signal representing a time delay digital IQ local oscillator signal;
according to the time delay digital IQ local oscillator signal, carrying out IQ modulation on the corrected Doppler modulation signal to obtain a Doppler IQ modulation signal, wherein the IQ modulation signal is as follows:
Iout＝Id2*Ir2+Qd2*Qr2
wherein, IoutRepresenting a doppler IQ modulated signal.
In one embodiment, the method further comprises the following steps: according to the current local oscillator signal, constructing a delay IQ local oscillator signal as follows:
Figure BDA0002459424280000041
wherein S isc2Representing a time-delay IQ local oscillator signal;
obtaining a radio frequency output signal corresponding to a false target according to the delay IQ local oscillator signal and the Doppler IQ modulation signal as follows:
Sout＝Iout*Sc2
wherein S isoutRepresenting the radio frequency output signal.
An inter-pulse coherent decoy jamming device, the device comprising:
the demodulation input module is used for generating a digital IQ local oscillator signal according to a preset digital center frequency; obtaining an intermediate frequency real signal of the radar to be interfered according to the current local oscillation signal and the radio frequency input signal; performing IQ demodulation on the intermediate-frequency real signal according to the digital IQ local oscillator signal to obtain an IQ demodulation signal;
the Doppler modulation module is used for obtaining the radar frequency of the radar to be interfered according to the intermediate-frequency real signal, and calculating the Doppler signal corresponding to the false target and the distance delay of the false target according to the preset false target initial distance, initial speed and the radar frequency; according to the Doppler signal, performing Doppler modulation on the IQ demodulation signal to obtain a Doppler modulation signal representing the initial phase change and Doppler frequency offset between false target pulses; correcting the Doppler modulation signal according to the distance delay to obtain a corrected Doppler modulation signal;
the modulation output module is used for carrying out IQ modulation according to the digital IQ local oscillator signal and the corrected Doppler modulation signal to obtain a Doppler IQ modulation signal; and obtaining a radio frequency output signal corresponding to the false target according to the Doppler IQ modulation signal and the current local oscillation signal.
A computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
generating a digital IQ local oscillator signal according to a preset digital center frequency;
obtaining an intermediate frequency real signal of the radar to be interfered according to the current local oscillation signal and the radio frequency input signal;
performing IQ demodulation on the intermediate-frequency real signal according to the digital IQ local oscillator signal to obtain an IQ demodulation signal;
obtaining the radar frequency of the radar to be interfered according to the intermediate-frequency real signal, and calculating to obtain a Doppler signal corresponding to a false target and the distance delay of the false target according to the preset false target initial distance, initial speed and the radar frequency;
according to the Doppler signal, performing Doppler modulation on the IQ demodulation signal to obtain a Doppler modulation signal representing the initial phase change and Doppler frequency offset between false target pulses;
correcting the Doppler modulation signal according to the distance delay to obtain a corrected Doppler modulation signal;
carrying out IQ modulation according to the digital IQ local oscillator signal and the corrected Doppler modulation signal to obtain a Doppler IQ modulation signal;
and obtaining a radio frequency output signal corresponding to the false target according to the Doppler IQ modulation signal and the current local oscillation signal.
The inter-pulse coherent false target interference method, the device and the computer equipment generate a digital IQ local oscillator signal according to the preset digital center frequency, obtain an intermediate frequency real signal of a radar to be interfered according to a current local oscillator signal and a radio frequency input signal, perform IQ demodulation on the intermediate frequency real signal according to the digital IQ local oscillator signal to obtain an IQ demodulation signal, obtain the radar frequency of the radar to be interfered according to the intermediate frequency real signal, calculate the distance delay of a Doppler signal corresponding to a false target and the false target according to the preset false target initial distance, initial speed and the radar frequency, perform Doppler modulation on the IQ demodulation signal according to the Doppler signal to obtain a Doppler modulation signal representing the initial phase change and Doppler frequency offset between the false targets, thereby realizing the relation between the delay change rule and the slow time Doppler in the signal, and correcting the Doppler modulation signal according to the distance delay to obtain a corrected Doppler modulation signal, performing IQ modulation according to the digital IQ local oscillation signal and the corrected Doppler modulation signal to obtain a Doppler IQ modulation signal, and obtaining a radio frequency output signal corresponding to the false target according to the Doppler IQ modulation signal and the current local oscillation signal. The embodiment of the invention can improve the effect of false target interference.
Drawings
FIG. 1 is a flow chart illustrating a method for inter-pulse coherent decoy interference according to an embodiment;
FIG. 2 is a block diagram of signal processing by an interfering device in one embodiment;
FIG. 3 is a block diagram of an exemplary inter-pulse coherent decoy jamming device;
FIG. 4 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, a method for inter-pulse coherent decoy interference is provided, which includes the following steps:
and 102, generating a digital IQ local oscillator signal according to a preset digital center frequency.
The digital center frequency is an inherent property of the interference device, and the digital center frequency is designed correspondingly when the device is manufactured, so that a corresponding digital IQ local oscillator signal can be generated according to the digital center frequency.
And 104, obtaining an intermediate frequency real signal of the radar to be interfered according to the current local oscillation signal and the radio frequency input signal.
The interference refers to interference on radar signals, generally speaking, a deception effect on the radar is achieved through a simulation target, namely a false target, and interference equipment can receive the radar signals according to current local oscillation signals and radio frequency input signals, so that intermediate frequency real signals of the radar to be interfered are obtained.
And 106, performing IQ demodulation on the intermediate frequency real signal according to the digital IQ local oscillation signal to obtain an IQ demodulation signal.
In this step, digital IQ local oscillator signals are used to perform IQ demodulation on the intermediate frequency real signals, so that IQ demodulated signals corresponding to the intermediate frequency real signals can be obtained.
And 108, obtaining the radar frequency of the radar to be interfered according to the intermediate-frequency real signal, and calculating to obtain the Doppler signal corresponding to the false target and the distance delay of the false target according to the preset false target initial distance, initial speed and the radar frequency.
When the false target is set, the initial distance and the initial speed of the false target can be set according to self setting of a user, the setting of the initial distance and the initial speed can be set according to actual task requirements, and the setting is not limited here.
And step 110, performing Doppler modulation on the IQ demodulation signal according to the Doppler signal to obtain a Doppler modulation signal representing the initial phase change and Doppler frequency offset between the false target pulses.
Through modulation, the IQ demodulation signal can be added with the initial phase change and the Doppler frequency offset between the false target pulses, so that the Doppler modulation signal is used for representing the initial phase change and the Doppler frequency offset between the false target pulses.
And step 112, correcting the Doppler modulation signal according to the distance delay to obtain a corrected Doppler modulation signal.
If the decoy is stationary or the coherent phase relationship between the pulses is not considered, no phase correction is required; on the contrary, due to the variation of the distance delay, the inter-pulse phase is affected by the up-down frequency conversion local oscillator signal and the digital IQ local oscillator signal, and needs to be corrected.
And step 114, performing IQ modulation according to the digital IQ local oscillator signal and the corrected Doppler modulation signal to obtain a Doppler IQ modulation signal.
The IQ modulation refers to modulating a Doppler IQ modulation signal of a baseband to an intermediate frequency, the IQ modulation and the IQ demodulation are opposite processes, and the two processes share the same digital IQ local oscillator which changes along with time.
And step 116, obtaining a radio frequency output signal corresponding to the false target according to the Doppler IQ modulation signal and the current local oscillation signal, wherein the frequency down-conversion and the frequency up-conversion are opposite processes, and the two processes share one analog local oscillation signal which changes along with time.
And the input and the output are considered to share the local oscillator, so that the frequency difference of the up-down frequency conversion can be compensated, namely, the current local oscillator signals are adopted for frequency conversion output.
The inter-pulse coherent false target interference method comprises the steps of generating a digital IQ local oscillator signal according to a preset digital center frequency, obtaining an intermediate frequency real signal of a radar to be interfered according to a current local oscillator signal and a radio frequency input signal, carrying out IQ demodulation on the intermediate frequency real signal according to the digital IQ local oscillator signal to obtain an IQ demodulation signal, obtaining a radar frequency of the radar to be interfered according to the intermediate frequency real signal, calculating the distance delay between a Doppler signal corresponding to a false target and the false target according to a preset false target initial distance, initial speed and the radar frequency, carrying out Doppler modulation on the IQ demodulation signal according to the Doppler signal to obtain a Doppler modulation signal representing the initial phase change and Doppler frequency offset between false targets, thereby realizing the relation between a delay change rule and slow time Doppler in the signal and according to the distance delay, and correcting the Doppler modulation signal to obtain a corrected Doppler modulation signal, carrying out IQ modulation according to the digital IQ local oscillation signal and the corrected Doppler modulation signal to obtain a Doppler IQ modulation signal, and obtaining a radio frequency output signal corresponding to the false target according to the Doppler IQ modulation signal and the current local oscillation signal. The embodiment of the invention has clear steps and stronger engineering property, can improve the effect of false target interference and is convenient to expand to the realization of the false targets with uniform acceleration and variable speed.
With respect to step 102, in one embodiment, the step of generating the digital IQ local oscillator signal may be: according to the preset digital center frequency, generating a digital IQ local oscillator signal as follows:
Ir＝cos(2πfrt)
Qr＝-sin(2πfrt)
wherein, IrI-way signal, Q, representing digital IQ local oscillator signalrQ-way signal, f, representing a digital IQ local oscillator signalrRepresenting the digital center frequency.
For step 104, in one embodiment, the RF signal is used as
Figure BDA0002459424280000091
The current local oscillator signal is
Figure BDA0002459424280000092
Then after frequency mixing and low pass filter, real signal in radar intermediate frequency can be obtained
Figure BDA0002459424280000093
For step 106, in one embodiment, the step of obtaining the IQ demodulated signal comprises: IQ dot multiplication is carried out on the intermediate frequency real signal according to the digital IQ local oscillator signal as follows, and finally IQ demodulation signal I is obtained through filteringmf,Qmf：
Im＝Ir*Iin
Qm＝Qr*Iin
Wherein, ImRepresenting the I-path signal, Q, in an IQ dot product signalmRepresenting the Q-path signal, I, in an IQ dot product signalinRepresenting the intermediate real signal.
Specifically, taking the above specific parameters as an example, the IQ dot product signal is obtained as:
Figure BDA0002459424280000094
Figure BDA0002459424280000095
filtering the IQ dot product signal, wherein the signal after filtering processing is as follows:
Figure BDA0002459424280000096
Figure BDA0002459424280000097
for step 108, according to the intermediate frequency real signal, obtaining a radar frequency of the radar to be interfered as follows:
fradar＝fc+f0
wherein f isradarRepresenting radar frequency, fcIndicating the frequency, f, corresponding to the current local oscillator signal0Representing the frequency corresponding to the real signal of the intermediate frequency. According to the preset initial distance, initial speed and radar frequency of the false target, calculating to obtain the Doppler value corresponding to the false target as follows:
Figure BDA0002459424280000101
wherein f isdRepresents the doppler value, c represents the speed of light, v represents the initial speed; and generating the doppler signal as:
Figure BDA0002459424280000102
Figure BDA0002459424280000103
wherein, IdI-path signal, Q, representing a Doppler signaldQ-path signals representing Doppler signals, lambda represents the wavelength corresponding to the Doppler value, and t represents continuous time;
according to the preset initial distance and initial speed of the false target, calculating the current distance delay of the false target as follows:
Figure BDA0002459424280000104
wherein R represents an initial distance.
For step 110, in one embodiment, the step of obtaining the doppler modulation signal comprises: according to the Doppler signal, Doppler modulation is carried out on the IQ demodulation signal, and the Doppler modulation signal which reflects the initial phase change and Doppler frequency offset between false target pulses is obtained as follows:
Id1＝Imf*Id+Qmf*Qd
Qd1＝Qmf*Id-Imf*Qd
wherein, Id1I-path signal, Q, representing a Doppler modulated signald1Representing the Q-path signal to the doppler modulated signal.
For step 112, in one embodiment, the step of obtaining the modified doppler modulation signal comprises: according to the distance delay, the obtained correction signal is:
Ijz＝cos(2π(fc+fr)τn)
Qjz＝-sin(2π(fc+fr)τn)
wherein, IjzI-way signal, Q, representing correction signaljzA Q-path signal representing a correction signal;
according to the correction signal, correcting the Doppler modulation signal to obtain a corrected Doppler modulation signal:
Id2＝Id1*Ijz+Qd1*Qjz
Qd2＝Qd1*Ijz-Id1*Qjz
wherein, Id2I-path signal, Q, representing a modified Doppler modulated signald2A Q-path signal representing the modified doppler modulated signal.
Specifically, when performing IQ demodulation, the signal I can be obtained by capturing AD data according to detection level triggeringinMeanwhile, timing is started according to the rising edge of the pulse, then IQ demodulation signals obtained through demodulation need to be stored, and during storage, a timing variable T can be setcIf T isc≥τnThen τ isn＝TcAnd immediately proceeding to the next step; if T isc＜τnThen wait for Tc＝τnProceed to the next step. Through the above processing, a storage waiting mechanism can be formed, which facilitates correction of data.
For step 114, in one embodiment, obtaining the doppler IQ modulated signal comprises: according to the digital IQ local oscillator signal, acquiring the current digital IQ local oscillator signal:
Ir2＝cos(2πfrt-2πfrτ1)
Qr2＝-sin(2πfrt-2πfrτ1)
wherein, tau1Representing the current range delay of the decoy, Ir2I-path signal, Q, representing a time-delayed digital IQ local oscillator signalr2A Q-path signal representing a time delay digital IQ local oscillator signal;
according to the time delay digital IQ local oscillator signal, carrying out IQ modulation on the corrected Doppler modulation signal to obtain a Doppler IQ modulation signal:
Iout＝Id2*Ir2+Qd2*Qr2
wherein, IoutRepresenting a doppler IQ modulated signal.
Specifically, taking the above specific parameters as an example to perform calculation, the following results are obtained:
Figure BDA0002459424280000111
for step 116, in one embodiment, the step of obtaining the rf output signal corresponding to the decoy includes: according to the current local oscillation signal, obtaining:
Figure BDA0002459424280000112
wherein S isc2A local oscillator signal representing a current time;
according to the local oscillator signal and the Doppler IQ modulation signal at the current moment, the radio frequency output signal corresponding to the false target obtained after point multiplication filtering is as follows:
Sout＝Iout*Sc2
wherein S isoutRepresenting the radio frequency output signal.
When the parameters are specifically calculated, the following are obtained:
Figure BDA0002459424280000121
after the high-pass filtering is carried out on the result, the following results are obtained:
Figure BDA0002459424280000122
it is worth noting that the above process is based on a single pulse signal, 2 π f for the case of multiple pulse signalsct+2πfot of the t component is the same for each pulse signal and is the same for the Doppler component
Figure BDA0002459424280000123
T of (a) is a function of absolute time, and thus the last time can be written as:
Figure BDA0002459424280000124
comparison SoutAnd SinThe signals can be known as follows: increase the Doppler frequency in a fast time
Figure BDA0002459424280000125
At slow time increase
Figure BDA0002459424280000126
At the initial phase, the processed signal completely conforms to the signal characteristics of the real target.
For the above technical process, as shown in fig. 2, a signal processing block diagram of an interference device in an embodiment is provided, in fig. 2, a radio frequency input signal is received, a down-conversion is performed on the radio frequency input signal, a level detection is performed on the radio frequency input signal to perform a level trigger, then an IQ local oscillator signal is used to perform IQ demodulation on an intermediate frequency real signal obtained by the down-conversion during the level trigger, and then doppler modulation, phase correction, IQ modulation, and frequency up-conversion are sequentially performed until the radio frequency output.
It should be understood that, although the steps in the flowchart of fig. 1 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 1 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 3, there is provided an inter-pulse coherent decoy interference apparatus, including: a demodulation input module 302, a doppler modulation module 304, and a modulation output module 306, wherein:
a demodulation input module 302, configured to generate a digital IQ local oscillator signal according to a preset digital center frequency; obtaining an intermediate frequency real signal of the radar to be interfered according to the current local oscillation signal and the radio frequency input signal; and carrying out IQ demodulation on the intermediate frequency real signal according to the digital IQ local oscillator signal to obtain an IQ demodulation signal.
The doppler modulation module 304 is configured to obtain a radar frequency of a radar to be interfered according to the intermediate-frequency real signal, and calculate a doppler signal corresponding to a false target and a distance delay of the false target according to a preset false target initial distance, an initial speed, and the radar frequency; according to the Doppler signal, performing Doppler modulation on the IQ demodulation signal to obtain a Doppler modulation signal representing the initial phase change and Doppler frequency offset between false target pulses; and correcting the Doppler modulation signal according to the distance delay to obtain a corrected Doppler modulation signal.
A modulation output module 306, configured to perform IQ modulation according to the digital IQ local oscillator signal and the modified doppler modulation signal to obtain a doppler IQ modulation signal; and obtaining a radio frequency output signal corresponding to the false target according to the Doppler IQ modulation signal and the current local oscillation signal.
In one embodiment, the demodulation input module 302 is further configured to generate a digital IQ local oscillator signal according to a preset digital center frequency, where the digital IQ local oscillator signal is:
Ir＝cos(2πfrt)
Qr＝-sin(2πfrt)
wherein, IrI-way signal, Q, representing digital IQ local oscillator signalrQ-way signal, f, representing a digital IQ local oscillator signalrRepresenting the digital center frequency.
In one embodiment, the demodulation input module 302 is further configured to perform IQ dot-multiplication on the intermediate frequency real signal according to the digital IQ local oscillator signal, and obtain an IQ dot-multiplied signal as:
Im＝Ir*Iin
Qm＝Qr*Iin
wherein, ImRepresenting the I-path signal, Q, in an IQ dot product signalmRepresenting the Q-path signal, I, in an IQ dot product signalinRepresenting real signals of intermediate frequency, pair ImFiltering the signal to obtain an I-path signal I of an IQ demodulation signalmfTo Q, pairmQ-path signal Q of IQ demodulation signal obtained by filtering signalmf。
In one embodiment, the doppler modulation module 304 is further configured to obtain, according to the intermediate frequency real signal, a radar frequency of the radar to be interfered as:
fradar＝fc+f0
wherein f isradarRepresenting radar frequency, fcIndicating the frequency, f, corresponding to the current local oscillator signal0Representing the frequency corresponding to the intermediate frequency real signal; calculating to obtain false according to preset false target initial distance, initial speed and radar frequencyThe target corresponds to a doppler value of:
Figure BDA0002459424280000141
wherein f isdRepresents the doppler value, c represents the speed of light, v represents the initial speed; and generating the doppler signal as:
Figure BDA0002459424280000142
Figure BDA0002459424280000143
wherein, IdI-path signal, Q, representing a Doppler signaldQ-path signals representing Doppler signals, lambda represents the wavelength corresponding to the Doppler value, and t represents continuous time; according to the preset initial distance and initial speed of the false target, calculating the current distance delay of the false target as follows:
Figure BDA0002459424280000144
wherein R represents an initial distance.
In one embodiment, the doppler modulation module 304 is further configured to perform doppler modulation on the IQ demodulated signal according to the doppler signal, and obtain a doppler modulation signal representing an initial phase change and a doppler frequency offset between false target pulses as follows:
Id1＝Imf*Id+Qmf*Qd
Qd1＝Qmf*Id-Imf*Qd
wherein, ImfRepresenting the filtered signal of the I-path signal in the IQ demodulated signal, QmfRepresents a signal obtained by filtering a Q-path signal in an IQ demodulated signal, Id1I-path signal, Q, representing a Doppler modulated signald1Representing the Q-path signal to the doppler modulated signal.
In one embodiment, the doppler modulation module 304 is further configured to obtain, according to the distance delay, a correction signal as:
Ijz＝cos(2π(fc+fr)τn)
Qjz＝-sin(2π(fc+fr)τn)
wherein, IjzI-way signal, Q, representing correction signaljzA Q-path signal representing a correction signal; according to the correction signal, correcting the Doppler modulation signal to obtain a corrected Doppler modulation signal:
Id2＝Id1*Ijz+Qd1*Qjz
Qd2＝Qd1*Ijz-Id1*Qjz
wherein, Id2I-path signal, Q, representing a modified Doppler modulated signald2A Q-path signal representing the modified doppler modulated signal.
In one embodiment, the modulation output module 306 is further configured to, according to the digital IQ local oscillator signal, acquire the current digital IQ local oscillator signal as:
Ir2＝cos(2πfrt-2πfrτ1)
Qr2＝-sin(2πfrt-2πfrτ1)
wherein, tau1Representing the current range delay of the decoy, Ir2I-path signal, Q, representing a time-delayed digital IQ local oscillator signalr2A Q-path signal representing a time delay digital IQ local oscillator signal; according to the time delay digital IQ local oscillator signal, carrying out IQ modulation on the corrected Doppler modulation signal to obtain a Doppler IQ modulation signal, wherein the IQ modulation signal is as follows:
Iout＝Id2*Ir2+Qd2*Qr2
wherein, IoutRepresenting a doppler IQ modulated signal.
In one embodiment, the modulation output module 306 is further configured to obtain, according to the current local oscillation signal:
Figure BDA0002459424280000151
wherein S isc2Representing a time-delay IQ local oscillator signal; obtaining a radio frequency output signal corresponding to a false target according to the delay IQ local oscillator signal and the Doppler IQ modulation signal as follows:
Sout＝Iout*Sc2
wherein S isoutRepresenting the radio frequency output signal.
For the specific definition of the inter-pulse coherent decoy interference apparatus, reference may be made to the above definition of the inter-pulse coherent decoy interference method, which is not described herein again. The modules in the inter-pulse coherent decoy jamming device can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 4. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein, the processor of the computer device is used for providing calculation and control capability, and specifically, the processor can be an FPGA, a DSP, and the like. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method for inter-pulse coherent decoy interference. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 4 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In an embodiment, a computer device is provided, comprising a memory storing a computer program and a processor implementing the steps of the method in the above embodiments when the processor executes the computer program.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method in the above-mentioned embodiments.
It will be understood by those of ordinary skill in the art that all or a portion of the processes of the methods of the embodiments described above may be implemented by a computer program that may be stored on a non-volatile computer-readable storage medium, which when executed, may include the processes of the embodiments of the methods described above, wherein any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A method of inter-pulse coherent decoy jamming, the method comprising:
generating a digital IQ local oscillator signal according to a preset digital center frequency;
obtaining an intermediate frequency real signal of the radar to be interfered according to the current local oscillation signal and the radio frequency input signal;
performing IQ demodulation on the intermediate-frequency real signal according to the digital IQ local oscillator signal to obtain an IQ demodulation signal;
obtaining the radar frequency of the radar to be interfered according to the intermediate-frequency real signal, and calculating to obtain a Doppler signal corresponding to a false target and the distance delay of the false target according to the preset false target initial distance, initial speed and the radar frequency;
according to the Doppler signal, Doppler modulation is carried out on the IQ demodulation signal to obtain a Doppler modulation signal representing the initial phase change and Doppler frequency offset of a false target;
correcting the Doppler modulation signal according to the distance delay to obtain a corrected Doppler modulation signal;
carrying out IQ modulation according to the digital IQ local oscillator signal and the corrected Doppler modulation signal to obtain a Doppler IQ modulation signal;
and obtaining a radio frequency output signal corresponding to the false target according to the Doppler IQ modulation signal and the current local oscillation signal.
2. The method according to claim 1, wherein said generating a digital IQ local oscillator signal according to a preset digital center frequency comprises:
according to the preset digital center frequency, generating a digital IQ local oscillator signal as follows:
Ir＝cos(2πfrt)
Qr＝-sin(2πfrt)
wherein, IrI-way signal, Q, representing digital IQ local oscillator signalrQ-way signal, f, representing a digital IQ local oscillator signalrRepresenting the digital center frequency.
3. The method of claim 1, wherein performing IQ demodulation on the intermediate frequency real signal according to the digital IQ local oscillator signal to obtain an IQ demodulated signal, comprises:
performing IQ point multiplication on the intermediate frequency real signal according to the digital IQ local oscillator signal to obtain a point multiplication signal:
Im＝Ir*Iin
Qm＝Qr*Iin
wherein, ImRepresenting the I-path signal, Q, in an IQ dot product signalmRepresenting the Q-path signal, I, in an IQ dot product signalinRepresenting real signals of intermediate frequency, pair ImFiltering the signal to obtain an I-path signal I of an IQ demodulation signalmfTo Q, pairmQ-path signal Q of IQ demodulation signal obtained by filtering signalmf。
4. The method of claim 1, wherein obtaining a radar frequency of a radar to be interfered according to the intermediate-frequency real signal, and calculating a doppler signal corresponding to a false target and a current range delay of the false target according to a preset false target initial distance, an initial speed and the radar frequency comprises:
according to the intermediate frequency real signal, obtaining the radar frequency of the radar to be interfered as follows:
fradar＝fc+f0
wherein f isradarRepresenting radar frequency, fcIndicating the frequency, f, corresponding to the current local oscillator signal0Representing the frequency corresponding to the intermediate frequency real signal;
according to the preset false target initial distance, initial speed and the radar frequency, calculating to obtain a Doppler value corresponding to a false target as follows:
Figure FDA0002459424270000021
wherein f isdRepresents the doppler value, c represents the speed of light, v represents the initial speed;
and generating the doppler signal as:
Figure FDA0002459424270000022
Figure FDA0002459424270000023
wherein, IdI-path signal, Q, representing a Doppler signaldQ-path signals representing Doppler signals, lambda represents the wavelength corresponding to the Doppler value, and t represents continuous time;
according to the preset initial distance and initial speed of the false target, calculating the current distance delay of the false target as follows:
Figure FDA0002459424270000024
wherein R represents an initial distance.
5. The method according to any one of claims 1 to 4, wherein performing Doppler modulation on the IQ demodulated signal according to the Doppler signal to obtain a Doppler modulated signal representing false target initial phase change and Doppler frequency offset, comprises:
according to the Doppler signal, Doppler modulation is carried out on the IQ demodulation signal, and the Doppler modulation signal which represents the initial phase change and Doppler frequency offset between false target pulses is obtained as follows:
Id1＝Imf*Id+Qmf*Qd
Qd1＝Qmf*Id-Imf*Qd
wherein, Id1I-path signal, Q, representing a Doppler modulated signald1Representing the Q-path signal to the doppler modulated signal.
6. The method of claim 5, wherein modifying the Doppler modulation signal according to the range delay to obtain a modified Doppler modulation signal comprises:
and according to the distance delay, obtaining a correction signal as follows:
Ijz＝cos(2π(fc+fr)τn)
Qjz＝-sin(2π(fc+fr)τn)
wherein, IjzI-way signal, Q, representing correction signaljzA Q-path signal representing a correction signal;
according to the correction signal, correcting the Doppler modulation signal to obtain a corrected Doppler modulation signal:
Id2＝Id1*Ijz+Qd1*Qjz
Qd2＝Qd1*Ijz-Id1*Qjz
wherein, Id2I-path signal, Q, representing a modified Doppler modulated signald2Q-channel signal representing modified doppler modulated signalNumber (n).
7. The method according to any one of claims 1 to 4, wherein performing IQ modulation according to the digital IQ local oscillator signal and the modified Doppler modulation signal to obtain a Doppler IQ modulation signal, comprises:
according to the digital IQ local oscillator signal, acquiring a current digital IQ local oscillator signal:
Ir2＝cos(2πfrt-2πfrτ1)
Qr2＝-sin(2πfrt-2πfrτ1)
wherein, tau1Representing the current range delay of the decoy, Ir2I-path signal, Q, representing a time-delayed digital IQ local oscillator signalr2A Q-path signal representing a time delay digital IQ local oscillator signal;
according to the time delay digital IQ local oscillator signal, carrying out IQ modulation on the corrected Doppler modulation signal to obtain a Doppler IQ modulation signal, wherein the IQ modulation signal is as follows:
Iout＝Id2*Ir2+Qd2*Qr2
wherein, IoutRepresenting a doppler IQ modulated signal.
8. The method according to any one of claims 1 to 4, wherein obtaining a radio frequency output signal corresponding to a decoy according to the Doppler IQ modulation signal and the current local oscillation signal comprises:
according to the current local oscillation signal, obtaining:
Figure FDA0002459424270000041
wherein S isc2A local oscillator signal representing a current time;
according to the local oscillator signal at the current moment and the Doppler IQ modulation signal, obtaining a radio frequency output signal corresponding to a false target after point multiplication filtering, wherein the radio frequency output signal is as follows:
Sout＝Iout*Sc2
wherein S isoutRepresenting the radio frequency output signal.
9. An inter-pulse coherent decoy jamming device, comprising:
the demodulation input module is used for generating a digital IQ local oscillator signal according to a preset digital center frequency; obtaining an intermediate frequency real signal of the radar to be interfered according to the current local oscillation signal and the radio frequency input signal; performing IQ demodulation on the intermediate-frequency real signal according to the digital IQ local oscillator signal to obtain an IQ demodulation signal;
the Doppler modulation module is used for obtaining the radar frequency of the radar to be interfered according to the intermediate-frequency real signal, and calculating the Doppler signal corresponding to the false target and the distance delay of the false target according to the preset false target initial distance, initial speed and the radar frequency; according to the Doppler signal, performing Doppler modulation on the IQ demodulation signal to obtain a Doppler modulation signal representing the initial phase change and Doppler frequency offset between false target pulses; correcting the Doppler modulation signal according to the distance delay to obtain a corrected Doppler modulation signal;
the modulation output module is used for carrying out IQ modulation according to the digital IQ local oscillator signal and the corrected Doppler modulation signal to obtain a Doppler IQ modulation signal; and obtaining a radio frequency output signal corresponding to the false target according to the Doppler IQ modulation signal and the current local oscillation signal.
10. A computer device comprising a memory and a processor, the memory storing a computer program, wherein the processor implements the steps of the method of any one of claims 1 to 7 when executing the computer program.
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