CN113759327A - Interference method and system for linear frequency modulation continuous wave radar and electronic equipment - Google Patents
Interference method and system for linear frequency modulation continuous wave radar and electronic equipment Download PDFInfo
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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
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
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- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
- G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
- G01S13/34—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal
Abstract
The invention relates to the technical field of radar signal interference, and provides an interference method, a system and electronic equipment for a linear frequency modulation continuous wave radar, wherein the signal frequency modulation bandwidth of the linear frequency modulation continuous wave radar to be interfered is obtained, and the range resolution is obtained; calculating a first frequency modulation amount corresponding to the maximum distance and a second frequency modulation amount corresponding to the minimum distance according to the range of the preset false background, and generating a modulation frequency offline sequence according to the number of samples, the first frequency modulation amount and the second frequency modulation amount according to the maximum distance and the minimum distance; generating a target scattering modulation sequence according to the number of samples and a preset background template parameter; generating an interference signal function according to the center frequency, the off-line sequence of the modulation frequency and the target scattering modulation sequence; the interference machine is controlled to transmit the interference signal corresponding to the interference signal function, so that the linear frequency modulation continuous wave radar can be effectively interfered, and the detection capability of the linear frequency modulation continuous wave radar on a moving target is reduced.
Description
Technical Field
The invention relates to the technical field of radar signal interference, in particular to a method and a system for interfering linear frequency modulation continuous wave radar and electronic equipment.
Background
At present, frequency modulation continuous wave radars at home and abroad mostly adopt an all-coherent and all-solid-state system, and the main operational mission of the system is to provide battlefield situation information for a command system and assist a commander in making decisions of tactical guidelines and strategic plans; provide early warning and the target instruction information of threat targets such as armed individual soldier, armoured vehicle, tank and low latitude sudden strain prevention armed helicopter to the operation platform to guide the operation platform to intercept, trail the target, finally use firepower system to destroy the threat target. The chirp Continuous Wave radar has the advantages of low peak power and high ranging accuracy, and currently, ground reconnaissance radars of a chirp Frequency Modulation Continuous Wave (LFMCW) system are adopted in many countries internationally. The entire radar is usually transported, moved, installed and worked on by one or two people. The ground battlefield radar can acquire the dynamics of a battlefield in real time, reconnaissance important targets such as typical armed individual soldiers, armed vehicles, tanks and the like in real time, and provide important information for battlefield commanders to make battlefield decisions. However, the conventional interference method for the pulse radar cannot be applied to the continuous wave radar, mainly because as an interference machine, when the signal of the continuous wave radar exists all the time, the pulse arrival time as the pulse radar cannot be obtained, and in addition, the time strategy for interference cannot be the same as that of the pulse radar.
Disclosure of Invention
The invention provides a method and a system for interfering a linear frequency modulation continuous wave radar and electronic equipment, aiming at the defects of the prior art.
The technical scheme of the interference method for the linear frequency modulation continuous wave radar is as follows:
acquiring the central frequency and the modulation frequency of a linear frequency modulation continuous wave radar to be interfered; acquiring the signal frequency modulation bandwidth of the to-be-interfered linear frequency modulation continuous wave radar according to the central frequency and the frequency modulation frequency, and acquiring the range resolution of the to-be-interfered linear frequency modulation continuous wave radar according to the signal frequency modulation bandwidth of the to-be-interfered linear frequency modulation continuous wave radar;
calculating to obtain a maximum distance and a minimum distance between the chirp continuous wave radar to be interfered and an interference machine according to a range of a preset false background, calculating a first frequency modulation amount corresponding to the maximum distance, calculating a second frequency modulation amount corresponding to the minimum distance, and calculating the number of samples of pulses for interference according to the maximum distance and the minimum distance;
generating a modulation frequency offline sequence according to the sample number, the first frequency modulation amount and the second frequency modulation amount;
generating a target scattering modulation sequence according to the number of the samples and a preset background template parameter;
generating an interference signal function according to the center frequency, the modulation frequency off-line sequence and the target scattering modulation sequence;
and controlling the interference machine to transmit the interference signal corresponding to the interference signal function.
The interference method for the linear frequency modulation continuous wave radar has the following beneficial effects:
can realize treating the interference range of interference linear frequency modulation continuous wave radar promptly to the target radar and carry out accurate control, the background template parameter is predetermine promptly to the stack background template parameter that has set up in advance simultaneously, make interfering signal's amplitude, phase place and Doppler frequency pass through comprehensive modulation, show that the inhomogeneous clutter background that predesigns is good is false background, can seriously interfere the permanent false alarm detection background of linear frequency modulation continuous wave radar, thereby reduce the detectability of linear frequency modulation continuous wave radar to the moving target, and based on actual linear frequency modulation continuous wave radar's echo data has verified the validity of this application.
On the basis of the scheme, the interference method for the linear frequency modulation continuous wave radar can be further improved as follows.
Further, the calculating a first frequency modulation amount corresponding to the maximum distance and calculating a second frequency modulation amount corresponding to the minimum distance includes:
calculating a first frequency modulation amount omega corresponding to the maximum distance according to a first formulamaxCalculating a second frequency modulation amount omega corresponding to the minimum distance according to a second formulaminThe first formula is:
the second formula is
Wherein B represents the signal frequency modulation bandwidth of the to-be-interfered linear frequency modulation continuous wave radar, c represents the light speed, and T representssRepresenting the sweep period of the chirped continuous wave radar to be interfered, dmaxRepresents said maximum distance, dminRepresenting the minimum distance.
Further, the obtaining of the range resolution of the chirped continuous wave radar to be interfered includes:
calculating the range resolution rho of the to-be-interfered linear frequency modulation continuous wave radar according to a third formula, wherein the third formula is as follows:
further, the calculating the number of samples of the pulse for interference according to the maximum distance and the minimum distance includes:
calculating the number of samples N of the pulse for interference using a fourth formula:
wherein the content of the first and second substances,
express and
the nearest integer.
Further, the generating a modulation frequency offline sequence according to the number of samples, the first frequency modulation amount, and the second frequency modulation amount includes:
obtaining and generating the modulation frequency offline sequence omega according to a fifth formula, wherein the fifth formula is as follows:
further, the generating a target scattering modulation sequence according to the number of samples and a preset background template parameter includes:
according to the sixth formulaGenerating the target scatter modulation sequence JJ(N)The sixth formula is:
wherein the content of the first and second substances,
k＝1,2,...,N，Akrepresents the scattering coefficient corresponding to the k-th pulse, akRepresenting the amplitude of the scattering coefficient corresponding to the k-th pulse,
representing the phase of scattering coefficient corresponding to the kth pulse, j representing the imaginary part mark, and the preset background template parameter including Ak、akAnd
further, generating an interference signal function according to the center frequency, the off-line sequence of modulation frequencies and the target scattering modulation sequence, including:
generating an interference signal function S according to a seventh formulaJ(N)The seventh formula is:
The technical scheme of the interference system for the linear frequency modulation continuous wave radar is as follows:
the device comprises a first calculation module, a second calculation module, a first generation module, a second generation module, a third generation module and a control module;
the first computing module is to: acquiring the central frequency and the frequency modulation frequency of a to-be-interfered linear frequency modulation continuous wave radar, acquiring the signal frequency modulation bandwidth of the to-be-interfered linear frequency modulation continuous wave radar according to the central frequency and the frequency modulation frequency, and acquiring the range resolution of the to-be-interfered linear frequency modulation continuous wave radar according to the signal frequency modulation bandwidth of the to-be-interfered linear frequency modulation continuous wave radar;
the second calculation module is configured to: calculating to obtain a maximum distance and a minimum distance between the chirp continuous wave radar to be interfered and an interference machine according to a range of a preset false background, calculating a first frequency modulation amount corresponding to the maximum distance, calculating a second frequency modulation amount corresponding to the minimum distance, and calculating the number of samples of pulses for interference according to the maximum distance and the minimum distance;
the first generation module is used for generating a modulation frequency offline sequence according to the sample number, the first frequency modulation amount and the second frequency modulation amount;
the second generation module is used for generating a target scattering modulation sequence according to the sample number and a preset background template parameter;
the third generation module is used for generating an interference signal function according to the center frequency, the off-line modulation frequency sequence and the target scattering modulation sequence;
the control module is used for controlling the interference machine to transmit the interference signal corresponding to the interference signal function.
The interference system for the linear frequency modulation continuous wave radar has the following beneficial effects:
can realize treating the interference range of interference linear frequency modulation continuous wave radar promptly to the target radar and carry out accurate control, the background template parameter is predetermine promptly to the stack background template parameter that has set up in advance simultaneously, make interfering signal's amplitude, phase place and Doppler frequency pass through comprehensive modulation, show that the inhomogeneous clutter background that predesigns is good is false background, can seriously interfere the permanent false alarm detection background of linear frequency modulation continuous wave radar, thereby reduce the detectability of linear frequency modulation continuous wave radar to the moving target, and based on actual linear frequency modulation continuous wave radar's echo data has verified the validity of this application.
On the basis of the scheme, the interference system of the linear frequency modulation continuous wave radar can be further improved as follows.
The process of calculating the first frequency modulation amount corresponding to the maximum distance and the second frequency modulation amount corresponding to the minimum distance by the second calculation module includes:
calculating a first frequency modulation amount omega corresponding to the maximum distance according to a first formulamaxCalculating a second frequency modulation amount omega corresponding to the minimum distance according to a second formulaminThe first formula is:
the second formula is
Wherein B represents the signal frequency modulation bandwidth of the to-be-interfered linear frequency modulation continuous wave radar, c represents the light speed, and T representssRepresenting the sweep period of the chirped continuous wave radar to be interfered, dmaxRepresents said maximum distance, dminRepresenting the minimum distance.
The process of calculating the range resolution of the chirp continuous wave radar to be interfered by the first calculation module comprises the following steps:
calculating the range resolution rho of the to-be-interfered linear frequency modulation continuous wave radar according to a third formula, wherein the third formula is as follows:
the process of the second calculation module calculating the number of samples of pulses for interference, comprising:
calculating the number of samples N of the pulse for interference using a fourth formula:
wherein the content of the first and second substances,
express and
the nearest integer.
Further, the first generating module is specifically configured to:
obtaining and generating the modulation frequency offline sequence omega according to a fifth formula, wherein the fifth formula is as follows:
further, the second generation module is specifically configured to:
generating the target scattering modulation sequence J according to a sixth formulaJ(N)The sixth formula is:
wherein the content of the first and second substances,
k＝1,2,...,N，Akrepresents the scattering coefficient corresponding to the k-th pulse, akRepresenting the amplitude of the scattering coefficient corresponding to the k-th pulse,
representing the phase of scattering coefficient corresponding to the kth pulse, j representing the imaginary part mark, and the preset background template parameter including Ak、akAnd
further, the third generating module is specifically configured to:
generating an interference signal function S according to a seventh formulaJ(N)The seventh formula is:
The technical scheme of the electronic equipment is as follows:
comprising a memory, a processor and a program stored on the memory and executed on the processor, the processor when executing the program implementing the steps of a method of jamming a chirped continuous wave radar according to any one of the preceding claims.
Drawings
Fig. 1 is a schematic flow chart of a method for interfering with a chirped continuous wave radar according to an embodiment of the present invention;
fig. 2 is a schematic diagram of LFMCW echo signals of a sawtooth wave.
FIG. 3 is a functional block diagram of a background spoofing interference implementation;
FIG. 4 is a radar MTD processing three-dimensional image;
FIG. 5 is a graph of radar MTD processing brightness;
FIG. 6 is a three-dimensional image of radar background deception jamming MTD processing;
FIG. 7 is a graph of radar background spoofing interference MTD processing brightness;
FIG. 8 is a schematic structural diagram of an interference system for a chirp continuous wave radar in accordance with an embodiment of the present invention;
Detailed Description
As shown in fig. 1, a method for interfering a chirped continuous wave radar according to an embodiment of the present invention includes the following steps:
s1, acquiring signal bandwidth and range resolution, specifically:
acquiring the central frequency and the modulation frequency of a linear frequency modulation continuous wave radar to be interfered; acquiring the signal frequency modulation bandwidth of the to-be-interfered linear frequency modulation continuous wave radar according to the central frequency and the frequency modulation frequency, and acquiring the range resolution of the to-be-interfered linear frequency modulation continuous wave radar according to the signal frequency modulation bandwidth of the to-be-interfered linear frequency modulation continuous wave radar;
s2, calculating the first frequency modulation amount, the second frequency modulation amount and the number of samples of the pulse for interference, specifically:
calculating to obtain a maximum distance and a minimum distance between the chirp continuous wave radar to be interfered and an interference machine according to a range of a preset false background, calculating a first frequency modulation amount corresponding to the maximum distance, calculating a second frequency modulation amount corresponding to the minimum distance, and calculating the number of samples of pulses for interference according to the maximum distance and the minimum distance;
s3, generating an offline modulation frequency sequence, specifically: generating a modulation frequency offline sequence according to the sample number, the first frequency modulation amount and the second frequency modulation amount;
s4, generating a target scattering modulation sequence, specifically: generating a target scattering modulation sequence according to the number of the samples and a preset background template parameter;
s5, generating a function for generating interference signals, specifically: generating an interference signal function according to the center frequency, the modulation frequency off-line sequence and the target scattering modulation sequence;
s6, performing interference, specifically: and controlling the interference machine to transmit the interference signal corresponding to the interference signal function.
Can realize treating the interference range of interference linear frequency modulation continuous wave radar promptly to the target radar and carry out accurate control, the background template parameter is predetermine promptly to the stack background template parameter that has set up in advance simultaneously, make interfering signal's amplitude, phase place and Doppler frequency pass through comprehensive modulation, show that the inhomogeneous clutter background that predesigns is good is false background, can seriously interfere the permanent false alarm detection background of linear frequency modulation continuous wave radar, thereby reduce the detectability of linear frequency modulation continuous wave radar to the moving target, and based on actual linear frequency modulation continuous wave radar's echo data has verified the validity of this application.
Preferably, in the above technical solution, in S2, the calculating a first frequency modulation amount corresponding to the maximum distance and calculating a second frequency modulation amount corresponding to the minimum distance includes:
s20, calculating the maximum distance according to a first formulaCorresponding first frequency modulation amount omegamaxCalculating a second frequency modulation amount omega corresponding to the minimum distance according to a second formulaminThe first formula is:
the second formula is
Wherein B represents the signal frequency modulation bandwidth of the to-be-interfered linear frequency modulation continuous wave radar, c represents the light speed, and T representssRepresenting the sweep period of the chirped continuous wave radar to be interfered, dmaxRepresents said maximum distance, dminRepresenting the minimum distance.
Preferably, in the above technical solution, in S1, the obtaining the range resolution of the chirped continuous wave radar to be interfered includes:
s10, calculating the range resolution rho of the chirp continuous wave radar to be interfered according to a third formula, wherein the third formula is as follows:
preferably, in the above technical solution, in S2, the calculating the number of samples of the pulse for performing interference according to the maximum distance and the minimum distance includes:
calculating the number of samples N of the pulse for interference using a fourth formula:
wherein the content of the first and second substances,
express and
the nearest integer.
Preferably, in the above technical solution, in S3, the generating a modulation frequency offline sequence according to the number of samples, the first frequency modulation amount, and the second frequency modulation amount includes:
s30, obtaining and generating the modulation frequency offline sequence omega according to a fifth formula, wherein the fifth formula is as follows:
preferably, in the above technical solution, in S4, the generating a target scattering modulation sequence according to the number of samples and a preset background template parameter includes:
s40, generating the target scattering modulation sequence J according to a sixth formulaJ(N)The sixth formula is:
wherein the content of the first and second substances,
k＝1,2,...,N，Akrepresents the scattering coefficient corresponding to the k-th pulse, akRepresenting the amplitude of the scattering coefficient corresponding to the k-th pulse,
representing the phase of scattering coefficient corresponding to the kth pulse, j representing the imaginary part mark, and the preset background template parameter including Ak、akAnd
preferably, in the above technical solution, in S5, generating an interference signal function according to the center frequency, the off-line sequence of modulation frequencies, and the target scattering modulation sequence includes:
s50, generating interference signal function S according to seventh formulaJ(N)The seventh formula is:
The interference to the chirp continuous wave radar can be realized by the following reasons:
the principle of the chirp continuous wave radar is as follows: the local oscillation transmitting signal of the system and the target echo signal are mixed to obtain a beat signal, and the beat signal is subjected to intermediate frequency amplification and then is sent to a digital signal processing system through AD sampling to complete detection of a moving target. Next, a model of the LFMCW radar signal of the sawtooth wave is described, and a schematic diagram of the LFMCW radar transmission signal and the received echo signal of the sawtooth wave is shown in fig. 2.
Setting the origin of the time coordinate at the starting point of the n-th positive frequency sweep transmitting signal interval, the LFMCW frequency sweep transmitting signal in the n-th signal repeating period can be expressed by the following formula
A0For the amplitude of the transmitted signal, μ is B/T, μ is the chirp rate, B is the tone bandwidth, and T is the chirp bandwidth. If the target distance is RnThe corresponding echo signal is
τ＝2RnC, c is the speed of light, the echo signal and the transmitting signal are mixed, the mixing process is completed in the analog part, the radar echo after mixing is processed by a low-pass filter, and the difference frequency signal is sn(Δ)＝A0 sin((2γτt+τω0-γτ2))；
It can be seen that the echoes of a stationary target are single frequency signals with a frequency of 2 γ τ, which is related to the distance of the signal. For the frequency modulation continuous wave signals, different distances correspond to different frequency points, and therefore distance distinguishing of targets is achieved.
Generally for a typical mixer, hypothetical mixing without loss of generalityThe characteristic curve of the device satisfies the square law, i.e.
Assuming that the interfering signal is in the form of
ω0For the center frequency, j (t) is a modulated signal, and the interference signal after being mixed with the local oscillator by the mixer can be expressed as m (t) ═ β (u) for examplej(t)+s(t))2
For the signal m (t) after the interference and the local array signal are mixed, the frequency of the signal m (t) is filtered by a filter and is 2 omega0The remaining signals may enter the subsequent radar signal processing circuit as follows: j is a function of2(t)/2 and
reasonable design J (t) can make interference signal enter into signal processor of radar after difference frequency processing, if necessary, generate frequency omeganThe modulation signal J (t) in the interference signal can be designed as
Then correspond to j2The signal of (t)/2 has a frequency of omeganSo that a predetermined interference frequency signal can be achieved, the interference signal function S is obtained by the present applicationJ(N)The corresponding interference signal, the process is shown in fig. 1 and fig. 3, and the interference to the chirped continuous wave radar can be realized.
Actual measurement echo data of a real LFCW ground reconnaissance radar is taken as a target, and the radar is a ground placing type radar and is mainly used for reconnaissance of a ground slow target. The radar works in a Ku frequency band, the distance detection precision is 10 meters, the sweep frequency period is about 1000Hz, and the sweep frequency accumulation number of single MTD processing is 64. A section of measured data with the distance range of 1000-10000 m is taken for analysis, and the processing result of Moving Target Detection (MTD) of actual radar echo without interference is shown in figures 4 and 5.
It can be seen from fig. 5 that there are 3 moving targets between 5000 meters and 8500 meters, the radar is erected on the mountaintop of about 300 meters, and 1000 meters to 3500 meters are the construction site and the urban area where a large number of moving targets exist, and it is still difficult to eliminate clutter interference after the MTD processing.
By adopting the method, the city clutter with the complex background is modulated to the more uniform range gate echo, and the short-distance clutter background echo of the radar is transmitted to the normal detection range area of the sub-radar through the storage, so that the target detection capability of the target radar is reduced, and the interference simulation result is shown in the figure 6 and the figure 7.
As can be seen from fig. 6 and 7, after the complex background echo is used to forward the interference pollution sample, the characteristics of the radar echo other than the original better empty and wide zero clutter channel are destroyed, the moving target capability of the radar is obviously reduced, and it can be seen from fig. 7 that 3 moving targets are covered by the forwarded background clutter between 5000 meters and 8500, and target detection cannot be normally performed. Meanwhile, due to the fact that the background deception is transmitted by the actual complex background clutter, intentional interference cannot be directly distinguished in the radar signal processing part, and interference hiding capacity is improved.
In the above embodiments, although the steps are numbered as S1, S2, etc., but only the specific embodiments are given in this application, and those skilled in the art may adjust the execution sequence of S1, S2, etc. according to the actual situation, which is also within the protection scope of the present invention, it is understood that some embodiments may include some or all of the above embodiments.
As shown in fig. 8, an interference system 200 for a chirped continuous wave radar according to an embodiment of the present invention includes a first calculating module 210, a second calculating module 220, a first generating module 230, a second generating module 240, a third generating module 250, and a control module 260;
the first calculation module 210 is configured to: acquiring the central frequency and the frequency modulation frequency of a to-be-interfered linear frequency modulation continuous wave radar, acquiring the signal frequency modulation bandwidth of the to-be-interfered linear frequency modulation continuous wave radar according to the central frequency and the frequency modulation frequency, and acquiring the range resolution of the to-be-interfered linear frequency modulation continuous wave radar according to the signal frequency modulation bandwidth of the to-be-interfered linear frequency modulation continuous wave radar;
the second calculation module 220 is configured to: calculating to obtain a maximum distance and a minimum distance between the chirp continuous wave radar to be interfered and an interference machine according to a range of a preset false background, calculating a first frequency modulation amount corresponding to the maximum distance, calculating a second frequency modulation amount corresponding to the minimum distance, and calculating the number of samples of pulses for interference according to the maximum distance and the minimum distance;
the first generating module 230 is configured to generate an offline modulation frequency sequence according to the number of samples, the first frequency modulation amount, and the second frequency modulation amount;
the second generating module 240 is configured to generate a target scattering modulation sequence according to the number of samples and a preset background template parameter;
the third generating module 250 is configured to generate an interference signal function according to the center frequency, the off-line sequence of modulation frequencies, and the target scattering modulation sequence;
the control module 260 is configured to control the jammer to transmit the interference signal corresponding to the interference signal function.
Can realize treating the interference range of interference linear frequency modulation continuous wave radar promptly to the target radar and carry out accurate control, the background template parameter is predetermine promptly to the stack background template parameter that has set up in advance simultaneously, make interfering signal's amplitude, phase place and Doppler frequency pass through comprehensive modulation, show that the inhomogeneous clutter background that predesigns is good is false background, can seriously interfere the permanent false alarm detection background of linear frequency modulation continuous wave radar, thereby reduce the detectability of linear frequency modulation continuous wave radar to the moving target, and based on actual linear frequency modulation continuous wave radar's echo data has verified the validity of this application.
Preferably, in the above technical solution, the process of calculating the first frequency modulation amount corresponding to the maximum distance and the second frequency modulation amount corresponding to the minimum distance by the second calculating module 220 includes:
calculating a first frequency modulation amount omega corresponding to the maximum distance according to a first formulamaxCalculating a second frequency modulation amount omega corresponding to the minimum distance according to a second formulaminThe first formula is:
the second formula is
Wherein B represents the signal frequency modulation bandwidth of the to-be-interfered linear frequency modulation continuous wave radar, c represents the light speed, and T representssRepresenting the sweep period of the chirped continuous wave radar to be interfered, dmaxRepresents said maximum distance, dminRepresenting the minimum distance.
Preferably, in the above technical solution, the process of calculating the range resolution of the chirped continuous wave radar to be interfered by the first calculating module 210 includes:
calculating the range resolution rho of the to-be-interfered linear frequency modulation continuous wave radar according to a third formula, wherein the third formula is as follows:
preferably, in the above technical solution, the process of calculating the number of samples of the pulse for interference by the second calculating module 220 includes:
calculating the number of samples N of the pulse for interference using a fourth formula:
wherein the content of the first and second substances,
express and
the nearest integer.
Preferably, in the above technical solution, the first generating module is specifically configured to:
obtaining and generating the modulation frequency offline sequence omega according to a fifth formula, wherein the fifth formula is as follows:
preferably, in the above technical solution, the second generating module 240 is specifically configured to:
generating the target scattering modulation sequence J according to a sixth formulaJ(N)The sixth formula is:
wherein the content of the first and second substances,
k＝1,2,...,N，Akrepresents the scattering coefficient corresponding to the k-th pulse, akRepresenting the amplitude of the scattering coefficient corresponding to the k-th pulse,
representing the phase of scattering coefficient corresponding to the kth pulse, j representing the imaginary part mark, and the preset background template parameter including Ak、akAnd
preferably, in the above technical solution, the third generating module 250 is specifically configured to:
generating an interference signal function S according to a seventh formulaJ(N)The seventh formula is:
The above steps for implementing corresponding functions for each parameter and each unit module in the interference system 200 for the chirped continuous wave radar according to the present invention may refer to each parameter and step in the above embodiments for an interference method for the chirped continuous wave radar, which are not described herein again.
An electronic device according to an embodiment of the present invention includes a memory, a processor, and a program stored in the memory and running on the processor, and when the processor executes the program, the processor implements any of the above-described steps of the method for interfering with a chirped continuous wave radar.
The electronic device may be a computer, a mobile phone, or the like, and correspondingly, the program is computer software or a mobile phone APP, and the parameters and the steps in the electronic device of the present invention may refer to the parameters and the steps in the above embodiment of the method for interfering a chirped continuous wave radar, which is not described herein again.
As will be appreciated by one skilled in the art, the present invention may be embodied as a system, method or computer program product.
Accordingly, the present disclosure may be embodied in the form of: may be embodied entirely in hardware, entirely in software (including firmware, resident software, micro-code, etc.) or in a combination of hardware and software, and may be referred to herein generally as a "circuit," module "or" system. Furthermore, in some embodiments, the invention may also be embodied in the form of a computer program product in one or more computer-readable media having computer-readable program code embodied in the medium.
Any combination of one or more computer-readable media may be employed. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. A method of jamming a chirped continuous wave radar, comprising:
acquiring the central frequency and the frequency modulation frequency of a to-be-interfered linear frequency modulation continuous wave radar, acquiring the signal frequency modulation bandwidth of the to-be-interfered linear frequency modulation continuous wave radar according to the central frequency and the frequency modulation frequency, and acquiring the range resolution of the to-be-interfered linear frequency modulation continuous wave radar according to the signal frequency modulation bandwidth of the to-be-interfered linear frequency modulation continuous wave radar;
calculating to obtain a maximum distance and a minimum distance between the chirp continuous wave radar to be interfered and an interference machine according to a range of a preset false background, calculating a first frequency modulation amount corresponding to the maximum distance, calculating a second frequency modulation amount corresponding to the minimum distance, and calculating the number of samples of pulses for interference according to the maximum distance and the minimum distance;
generating a modulation frequency offline sequence according to the sample number, the first frequency modulation amount and the second frequency modulation amount;
generating a target scattering modulation sequence according to the number of the samples and a preset background template parameter;
generating an interference signal function according to the center frequency, the modulation frequency off-line sequence and the target scattering modulation sequence;
and controlling the interference machine to transmit the interference signal corresponding to the interference signal function.
2. The method of claim 1, wherein the calculating a first amount of frequency modulation corresponding to the maximum distance and a second amount of frequency modulation corresponding to the minimum distance comprises:
calculating a first frequency modulation amount omega corresponding to the maximum distance according to a first formulamaxCalculating a second frequency modulation amount omega corresponding to the minimum distance according to a second formulaminThe first formula is:
the second formula is
Wherein B represents the signal frequency modulation bandwidth of the to-be-interfered linear frequency modulation continuous wave radar, c represents the light speed, and T representssRepresenting the sweep period of the chirped continuous wave radar to be interfered, dmaxRepresents said maximum distance, dminRepresenting the minimum distance.
3. The method of claim 2, wherein the obtaining the range resolution of the chirped continuous wave radar to be interfered comprises:
calculating the distance of the to-be-interfered linear frequency modulation continuous wave radar according to a third formulaThe resolution ρ, and the third formula is:
4. a method of jamming on a chirped continuous wave radar according to claim 3, wherein said calculating a number of samples of a pulse for jamming based on said maximum distance and said minimum distance comprises:
calculating the number of samples N of the pulse for interference using a fourth formula:
wherein the content of the first and second substances,
express and
the nearest integer.
5. The method of claim 4, wherein the generating an offline sequence of modulation frequencies from the number of samples, the first amount of frequency modulation, and the second amount of frequency modulation comprises:
obtaining and generating the modulation frequency offline sequence omega according to a fifth formula, wherein the fifth formula is as follows:
6. the method of claim 5, wherein the generating the target scattering modulation sequence according to the number of samples and the preset background template parameter comprises:
generating the target scattering modulation sequence J according to a sixth formulaJ(N)The sixth formula is:
wherein the content of the first and second substances,
k＝1,2,...,N，Akrepresents the scattering coefficient corresponding to the k-th pulse, akRepresenting the amplitude of the scattering coefficient corresponding to the k-th pulse,
representing the phase of scattering coefficient corresponding to the kth pulse, j representing the imaginary part mark, and the preset background template parameter including Ak、akAnd
7. a method of jamming on a chirped continuous wave radar according to claim 6, wherein generating a jamming signal function from the centre frequency, the off-line sequence of modulation frequencies and the target scattering modulation sequence comprises:
generating an interference signal function S according to a seventh formulaJ(N)The seventh formula is:
8. An interference system for a linear frequency modulation continuous wave radar is characterized by comprising a first calculation module, a second calculation module, a first generation module, a second generation module, a third generation module and a control module;
the first computing module is to: acquiring the central frequency and the frequency modulation frequency of a to-be-interfered linear frequency modulation continuous wave radar, acquiring the signal frequency modulation bandwidth of the to-be-interfered linear frequency modulation continuous wave radar according to the central frequency and the frequency modulation frequency, and acquiring the range resolution of the to-be-interfered linear frequency modulation continuous wave radar according to the signal frequency modulation bandwidth of the to-be-interfered linear frequency modulation continuous wave radar;
the second calculation module is configured to: calculating to obtain a maximum distance and a minimum distance between the chirp continuous wave radar to be interfered and an interference machine according to a range of a preset false background, calculating a first frequency modulation amount corresponding to the maximum distance, calculating a second frequency modulation amount corresponding to the minimum distance, and calculating the number of samples of pulses for interference according to the maximum distance and the minimum distance;
the first generation module is used for generating a modulation frequency offline sequence according to the sample number, the first frequency modulation amount and the second frequency modulation amount;
the second generation module is used for generating a target scattering modulation sequence according to the sample number and a preset background template parameter;
the third generation module is used for generating an interference signal function according to the center frequency, the off-line modulation frequency sequence and the target scattering modulation sequence;
the control module is used for controlling the interference machine to transmit the interference signal corresponding to the interference signal function.
9. An electronic device comprising a memory, a processor and a program stored on the memory and executed on the processor, wherein the processor when executing the program performs the steps of a method of jamming a chirped continuous wave radar according to any one of claims 1 to 7.
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