CN110109069B - Method for forming time-dependent-free frequency control array point-like interference wave beam - Google Patents

Method for forming time-dependent-free frequency control array point-like interference wave beam Download PDF

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CN110109069B
CN110109069B CN201910398597.2A CN201910398597A CN110109069B CN 110109069 B CN110109069 B CN 110109069B CN 201910398597 A CN201910398597 A CN 201910398597A CN 110109069 B CN110109069 B CN 110109069B
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interference
array
frequency control
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frequency
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CN110109069A (en
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廖可非
龚梓健
欧阳缮
李晶晶
廖桂生
蒋俊正
谢跃雷
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Guilin University of Electronic Technology
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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
    • 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
    • G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention discloses a method for forming a time-dependency-removed frequency control array point-like interference wave beam, which leads a transmitting wave beam to carry out energy convergence only at a specified target through a controllable wave beam forming method, thereby reducing the interference radiation energy suffered by peripheral targets, and specifically comprises the following steps: step 1: initializing frequency control array parameters; step 2: establishing an interference signal model; and step 3: receiving a target echo signal and determining the position of an interference target; and 4, step 4: designing a de-time-dependent frequency offset; and 5: introducing a random variable into the random frequency offset with time dependency removed; step 6: establishing a time-dependent frequency control array lattice-shaped interference signal removing model; and 7: beam pattern phase weighting; and 8: fixed point interference is realized. The invention can more accurately carry out fixed point interference on the target, continuously converge the energy of the frequency control array wave beam at the target and reduce the influence on the surrounding environment by changing the original S-shaped wave beam into the point wave beam.

Description

Method for forming time-dependent-free frequency control array point-like interference wave beam
Technical Field
The invention relates to the technical field of array signal processing, in particular to a method for removing time-dependent frequency control array lattice interference wave beam formation.
Background
In recent years, benefiting from the rapid and wide diffusion of unmanned aerial vehicle technology, various types of unmanned aerial vehicles are continuously released on the market, and due to the fact that the unmanned aerial vehicles are various in types and comprehensive in functions, convenience is brought to life of people, work efficiency can be improved, but accidents related to the unmanned aerial vehicles also frequently occur, and great challenges are formed on security and security management of the society.
In order to maintain social security and concealment in some special places, various research institutions and manufacturers at home and abroad also research various interference means, such as a set of unmanned aerial vehicle rapid capture and failure system of the American Atk system company; the system comprises an anti-unmanned aerial vehicle defense system (AUDS) developed by Blatt corporation in the UK, an ADS2000 system which is an attractive civil anti-unmanned aerial vehicle system and is introduced by Beidou laboratories in China, and the like. Although these devices or systems can effectively interfere with the drone, their interfering beams cover all objects in the coverage area, which also causes unnecessary interference to peripheral civilian devices (e.g., routers, bluetooth headsets, etc.).
Disclosure of Invention
Aiming at the defects of the prior art, the technical problem solved by the invention is how to overcome the defects that the energy of the frequency control array cannot be continuously converged at a target and how to reduce the beam energy convergence area so as to reduce the influence of an interference beam on the surrounding environment.
In order to solve the technical problems, the technical scheme adopted by the invention is a time-dependent frequency control array point-like interference beam forming method, energy of a transmitting beam is only converged at a specified target through a controllable beam forming method, so that interference radiation energy to peripheral targets is reduced, and the method specifically comprises the following steps:
step 1: initializing frequency control array parameters, and specifically comprising the following steps:
setting the number of elements of a radar array as M and the carrier frequency of a transmitted signal as f c The frequency bias between array elements is Deltaf, the light speed is c, and the wavelength is
Figure GDA0003567690330000021
Array element spacing of
Figure GDA0003567690330000022
The transmission signal bandwidth of each array element is B, and the initial interference distance is R 0 And a coverage angle of α;
step 2: establishing an interference signal model, which comprises the following specific processes:
performing full-band coverage interference by using a linear frequency modulation frequency control array LFM-FDA, wherein the initial transmission frequency of the m-th array element transmission signal of the frequency control array is as follows:
f m ＝f c +mΔf m＝0,1，...,M-1
wherein f is c Is much greater than Δ f; the signal transmitted by the mth array element is:
Figure GDA0003567690330000023
where q (T) is a gate signal and T is the pulse duration; the emission beam pattern obtained by accumulating the emission signals of each array element and performing linear frequency modulation is as follows:
Figure GDA0003567690330000024
and step 3: receiving a target echo signal, and determining the position of an interference target, wherein the specific process comprises the following steps:
multiplying the received target echo signal by carriers with the same frequency and phase of M frequency control array transmitting signals respectively for coherent demodulation to obtain M baseband signals, and realizing target positioning by adopting a frequency control array target positioning algorithm to obtain an interference target distance r and an angle theta;
and 4, step 4: designing the time-dependent frequency offset, which comprises the following specific steps:
introducing an interfering target position target (r, theta) into a frequency control array, wherein the array factor is as follows:
Figure GDA0003567690330000025
where Δ f (t) is the time-dependent frequency offset, the condition that the phase at which the array factor is maximized needs to satisfy can be found:
Figure GDA0003567690330000031
then Δ f (t) can be expressed as:
Figure GDA0003567690330000032
then the m-th array element time-dependent frequency offset in the frequency control array is:
Figure GDA0003567690330000033
and 5: introducing a random variable into the time-dependent random frequency offset, wherein the specific process is as follows:
to obtain a spot beam, direction Δ f m (t) adding a random variable to obtain a time-dependent random frequency offset:
Figure GDA0003567690330000034
wherein tau is a frequency offset control parameter, and the offset of the wave beam phase of the frequency control array can be controlled through the parameter; n is m Is a random variable, and can be expressed as:
n m ＝rand(m)
wherein rand is a random value symbol;
step 6: establishing a time-dependent frequency control array lattice interference signal removing model, which comprises the following specific processes:
the m-th array element initial carrier frequency of the time-dependent frequency control array is as follows:
f m ＝f c +n m Δf m＝0,1,.....,M-1
the interference signal transmitted by the m-th array element is:
Figure GDA0003567690330000035
the interference wave beam directional diagram formed after the signals of the array elements are accumulated is as follows:
Figure GDA0003567690330000041
and 7: the beam pattern phase weighting process includes the following specific steps:
carrying out phase weighting on the beam directional diagram to enable the peak value of the interference beam to be aligned to the target position, wherein the weighted beam directional diagram is as follows:
Figure GDA0003567690330000042
wherein
Figure GDA0003567690330000043
For phase weighting, it is expressed as:
Figure GDA0003567690330000044
wherein tau is a frequency offset control parameter; the beam phase is shifted due to the introduction of a random variable, and the beam offset can be controlled through the parameter; the TD-LFM-RFDA interference beam pattern is:
Figure GDA0003567690330000045
and 8: fixed point interference is realized, and the specific process is as follows:
and (4) transmitting the interference beam formed in the step (7) at a transmitting end with a large power, and blocking the target signal so as to form interference.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
by utilizing the distance and the azimuth dependence of the frequency control array beam pattern, the target can be interfered more accurately, and compared with the traditional means, the beam can be adjusted more flexibly to realize fixed-point interference.
The energy of the frequency control array beam can be continuously converged at a target, and meanwhile, the influence on the surrounding environment is reduced by changing the original S-shaped beam into the spot beam.
Drawings
FIG. 1 is a flow chart of removing time-dependent lattice-shaped beam interference of a frequency control lattice;
FIG. 2 is a diagram of a frequency control array interference signal emission model;
FIG. 3 is a schematic diagram of removing time-dependent lattice-shaped beam interference of a frequency control lattice;
fig. 4 is a graph of the time-independent frequency control lattice point-shaped beam energy convergence effect when t is 0 ms;
fig. 5 is a graph of the time-independent frequency control array lattice beam energy convergence effect when t is 0.25 ms;
fig. 6 is a diagram of the effect of removing the time-dependent frequency control lattice point-like beam energy convergence when t is 0.5 ms.
Detailed Description
The following description will be made with reference to the accompanying drawings and examples, but the present invention is not limited thereto.
Example (b):
firstly initializing frequency control array parameters, secondly establishing an interference signal model and positioning a target in a space, then designing a time-dependent frequency offset by combining target position information, adding a random variable into the frequency offset to destroy the linear distribution of the frequency offset so as to form a punctiform wave beam, then establishing a time-dependent frequency control array punctiform interference signal model by using the frequency offset, and finally weighting a wave beam pattern of the model so that the wave beam is aligned to the interference target and is transmitted with a larger power so as to realize interference. The specific implementation steps are shown in figure 1:
step 1: initializing frequency control array parameters, and specifically comprising the following steps:
because the working frequency band of the remote control signal of the unmanned aerial vehicle jumps within the range of 2.4GHz-2.483GHz, the parameters of the frequency control array are set, as shown in the following table:
number of array elements M 30
Carrier frequency f of transmitted signal c 2.4GHz
Duration of pulse T 0.1ms
Signal bandwidth B 1MHz
Wavelength lambda 0.125m
Initial interference distance R 0 120Km
Initial disturbance angle alpha 0°
Array element spacing d 0.0625m
Duration of observation t 0.5ms
Step 2: establishing an interference signal model, which comprises the following specific processes:
performing full-band coverage interference by using a linear frequency modulation frequency control array LFM-FDA; the initial transmitting frequency of the m-th array element transmitting signal of the frequency control array is as follows:
f m ＝f c +mΔf m＝0，1，...，M-1
wherein f is c Is much greater than Δ f; the signal transmitted by the mth array element is:
Figure GDA0003567690330000061
where q (T) is the gate signal and T is the pulse duration, the model is shown in FIG. 2; the emission beam directional diagram obtained by accumulating emission signals of each array element and performing linear frequency modulation is as follows:
Figure GDA0003567690330000062
and step 3: receiving a target echo signal, and determining the position of an interference target, wherein the specific process comprises the following steps:
multiplying the received target echo signals by 30 carriers with the same frequency and phase of frequency control array transmitting signals respectively to carry out coherent demodulation to obtain 30 baseband signals, and realizing target positioning by adopting a frequency control array target positioning algorithm (such as MUSIC algorithm, reference documents: Kunkang, Ouyang maintenance, Liangjingjinghua, Liuwei, Shanghai. frequency diversity array radar target positioning method [ J ] based on the MUSIC algorithm, proceedings of Guilin electronics science and technology university, 2017, 37 (02): 87-91) to obtain an interference target distance r and an angle theta; setting the detected target position to be interfered as (40Km, 30 degrees);
and 4, step 4: designing the time-dependent frequency offset removal, which comprises the following specific steps:
introducing an interfering target position target (r, theta) into a frequency control array, wherein the array factor is as follows:
Figure GDA0003567690330000071
where Δ f (t) is the time-dependent frequency offset, the condition that the phase at which the array factor is maximized needs to satisfy can be found:
Figure GDA0003567690330000072
if k is 1, Δ f (t) can be expressed as:
Figure GDA0003567690330000073
then the m-th array element time-dependent frequency offset in the frequency control array is:
Figure GDA0003567690330000074
and 5: introducing a random variable into time-dependent random frequency offset, wherein the specific process is as follows:
to obtain a spot beam, direction Δ f m (t) adding a random variable to obtain a time-dependent random frequency offset:
Figure GDA0003567690330000075
wherein tau is a frequency offset control parameter, and the offset of the wave beam phase of the frequency control array can be controlled through the parameter; n is m Is a random variable, and can be expressed as:
n m ＝rand(30)
wherein rand is a random value symbol, then n m Is any integer within 30;
step 6: establishing a time-dependent frequency control array lattice interference signal removing model, which comprises the following specific processes:
the m-th array element initial carrier frequency of the time-dependent frequency control array is as follows:
f m ＝f c +n m Δf m＝0,1,.....,M-1
the interference signal transmitted by the m-th array element is:
Figure GDA0003567690330000081
the model is shown in figure 3; the interference wave beam directional diagram formed after the signals of the array elements are accumulated is as follows:
Figure GDA0003567690330000082
and 7: the beam pattern phase weighting process includes the following specific steps:
and carrying out phase weighting on the beam directional diagram to enable the peak value of the beam to be aligned to the target position, wherein the weighted beam directional diagram is as follows:
Figure GDA0003567690330000083
wherein
Figure GDA0003567690330000084
For phase weighting, it is expressed as:
Figure GDA0003567690330000085
setting a frequency offset control parameter tau to be 0.5; the TD-LFM-RFDA beam pattern is:
Figure GDA0003567690330000086
and 8: fixed point interference is realized, and the specific process is as follows:
transmitting the interference wave beam formed in the step 7 at a transmitting end with a large power, and blocking a target signal so as to form interference; the energy convergence conditions of the wave beam at different moments in the observation time are shown in the attached figures 4, 5 and 6, and it can be seen from the figures that the energy of the frequency control array interference wave beam can be continuously converged at a target, and meanwhile, the energy convergence area is in a point shape, so that the influence on the surrounding environment is greatly reduced.
Compared with the prior art, the invention has the beneficial effects that:
by utilizing the distance and the azimuth dependence of the frequency control array beam pattern, the target can be interfered more accurately, and compared with the traditional means, the beam can be adjusted more flexibly to realize fixed-point interference.
The energy of the frequency control array beam can be continuously converged at a target, and meanwhile, the influence on the surrounding environment is reduced by changing the original S-shaped beam into the spot beam.
The embodiments of the present invention have been described in detail with reference to the drawings and examples, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention.

Claims (2)

1. A method for forming a time-dependent frequency control array point-like interference wave beam is characterized in that a controllable wave beam forming method is adopted, so that energy convergence is carried out on a transmitting wave beam only at a specified target, and interference radiation energy received by peripheral targets is reduced, and the method specifically comprises the following steps:
step 1: initializing frequency control array parameters, and specifically comprising the following steps:
setting the number of elements of a radar array as M and the carrier frequency of a transmitted signal as f c The frequency bias between array elements is Deltaf, the light speed is c, and the wavelength is
Figure FDA0003733209790000011
Array element spacing of
Figure FDA0003733209790000012
The transmission signal bandwidth of each array element is B, and the initial interference distance is R 0 And the interference angle is alpha;
step 2: establishing an interference signal model, which comprises the following specific processes:
and performing full-band coverage interference by adopting a linear frequency modulation frequency control array LFM-FDA, wherein the initial transmitting frequency of the m-th array element transmitting signal of the frequency control array is as follows:
f m ＝f c +mΔf m＝0,1，...,M-1
wherein f is c Is much greater than Δ f; the signal transmitted by the mth array element is:
Figure FDA0003733209790000013
where q (T) is a gate signal and T is the pulse duration; the emission beam pattern obtained by accumulating the emission signals of each array element and performing linear frequency modulation is as follows:
Figure FDA0003733209790000014
and step 3: receiving a target echo signal, and determining the position of an interference target, wherein the specific process comprises the following steps:
multiplying the received target echo signal by carriers with the same frequency and phase of M frequency control array transmission signals respectively to carry out coherent demodulation to obtain M baseband signals, and realizing target positioning by adopting a frequency control array target positioning algorithm to obtain an interference target distance r and an angle theta;
and 4, step 4: designing the time-dependent frequency offset, which comprises the following specific steps:
introducing an interfering target position target (r, theta) into a frequency control array, wherein the array factor is as follows:
Figure FDA0003733209790000021
where Δ f (t) is the time-dependent frequency offset, the condition that the phase at which the array factor is maximized needs to satisfy can be found:
Figure FDA0003733209790000022
then Δ f (t) can be expressed as:
Figure FDA0003733209790000023
then the m-th array element time-dependent frequency offset in the frequency control array is:
Figure FDA0003733209790000024
and 5: introducing a random variable into the time-dependent random frequency offset, wherein the specific process is as follows:
to obtain a spot beam, direction Δ f m (t) adding a random variable to obtain a time-dependent random frequency offset:
Figure FDA0003733209790000025
wherein tau is a frequency offset control parameter, and the offset of the wave beam phase of the frequency control array can be controlled through the parameter; n is m Is a random variable, and can be expressed as:
n m ＝rand(m)
wherein rand is a random value symbol;
step 6: establishing a time-dependent frequency control array lattice interference signal removing model, which comprises the following specific processes:
the m-th array element initial carrier frequency of the time-dependent frequency control array is as follows:
f m ＝f c +n m Δf m＝0,1,.....,M-1
the interference signal transmitted by the m-th array element is:
Figure FDA0003733209790000031
the interference wave beam directional diagram formed after the signals of the array elements are accumulated is as follows:
Figure FDA0003733209790000032
and 7: beam pattern phase weighting;
and 8: fixed point interference is realized, and the specific process is as follows:
and (4) transmitting the interference beam formed in the step (7) at a transmitting end with a large power, and blocking the target signal so as to form interference.
2. The method according to claim 1, wherein the specific process of step 7 is as follows:
and carrying out phase weighting on the beam directional diagram to enable the peak value of the interference beam to be aligned to the target position, wherein the weighted beam directional diagram is as follows:
Figure FDA0003733209790000033
wherein
Figure FDA0003733209790000034
For phase weighting, it is expressed as:
Figure FDA0003733209790000035
wherein tau is a frequency offset control parameter; the beam phase is shifted due to the introduction of a random variable, and the beam offset can be controlled through the parameter; the interference beam pattern is then:
Figure FDA0003733209790000036
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