CN111965606B - DRFM (digital radio frequency modulation) technology-based adaptive deception suppression composite interference method - Google Patents

DRFM (digital radio frequency modulation) technology-based adaptive deception suppression composite interference method Download PDF

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CN111965606B
CN111965606B CN202010827172.1A CN202010827172A CN111965606B CN 111965606 B CN111965606 B CN 111965606B CN 202010827172 A CN202010827172 A CN 202010827172A CN 111965606 B CN111965606 B CN 111965606B
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frequency shift
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CN111965606A (en
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徐磊
赵宪涛
丁佐诚
俞成龙
栾铸徵
史厚宝
陈旭
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Yangzhou Institute Of Marine Electronic Instruments No723 Institute Of China Shipbuilding Industry Corp
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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
    • G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
    • 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
    • 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

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

The invention discloses a DRFM technology-based self-adaptive deception suppression composite interference method, which comprises the following steps: intercepting a received radar signal, performing frequency shift modulation on the intercepted signal, and performing secondary modulation on the frequency shift quantity in a pulse by utilizing a window function characteristic curve to generate distance dragging self-adaptive deception jamming; performing frequency shift modulation on the intercepted signal and simultaneously performing frequency shift slope modulation on the intercepted signal to generate stripe-type suppression interference with a settable width by taking a shielding target as a center; and carrying out weighted modulation on the suppression interference and the deception interference to generate composite interference. The invention reduces the recognition and countering probability of radar to interference, thereby achieving better interference effect and protecting the shielded target.

Description

DRFM (digital radio frequency modulation) technology-based adaptive deception suppression composite interference method
Technical Field
The invention belongs to radar interference and anti-interference technology, and particularly relates to a self-adaptive deception suppression composite interference method based on a DRFM technology.
Background
Under the development of digital frequency storage technology (DRFM), radar interference technology is rapidly developed, traditional analog interference is changed into digital interference, and a forwarded signal has high coherence with an original signal. The distance Doppler coupling characteristic of the LFM signal enables the frequency shift forwarding interference to have better interference performance. Conventional frequency shift deception jamming based on DRFM technology is easy to identify by radar, and the radar cannot realize jamming effect after adopting anti-jamming means. The existing suppression interference often suppresses the radar in a full distance section, so that the power utilization rate is low, and power waste is caused. Conventional spoofing and jamming is typically performed in a time-sharing implementation. With the continuous improvement of the anti-interference capability of the radar, the conventional interference measure strategy cannot achieve the expected combat effectiveness.
Disclosure of Invention
The invention aims to provide a self-adaptive deception jamming composite interference method based on a DRFM technology, which is used for generating strip type deception jamming with a settable width and distance dragging type deception jamming with a preset initial jamming position by taking a shielding target as a center, and simultaneously implementing deception jamming so as to reduce the recognition and countering probability of radar on the jamming, thereby achieving a better jamming effect and protecting the shielded target.
The technical solution for realizing the purpose of the invention is as follows: an adaptive spoofing suppressing composite interference method based on a DRFM technology comprises the following steps:
intercepting a received radar signal, performing frequency shift modulation on the intercepted signal, and performing secondary modulation on the frequency shift quantity in a pulse by utilizing a window function characteristic curve to generate distance dragging self-adaptive deception jamming;
performing frequency shift modulation on the intercepted signal and simultaneously performing frequency shift slope modulation on the intercepted signal to generate stripe-type suppression interference with a settable width by taking a shielding target as a center;
and carrying out weighted modulation on the suppression interference and the deception interference to generate composite interference.
Preferably, the specific steps are as follows:
intercepting radar signals and analyzing the radar signals to obtain the time width and the bandwidth width of the linear frequency modulation signals of the intercepted section;
calculating the frequency modulation slope of the intercepted radar signal;
the intercepted signals are subjected to frequency shift modulation and frequency change slope modulation at the same time, so that stripe-type suppression interference with the width being set is generated by taking a shielding target as the center; generating front drag or rear drag self-adaptive deception jamming which starts from a specified distance from a protected target by performing frequency shift modulation on the intercepted signal and performing secondary frequency shift modulation according to a drag strategy and a window function;
and carrying out weighted modulation on the suppression interference and the deception interference to generate composite interference.
Preferably, the specific method for generating the distance dragging self-adaptive spoofing interference is as follows:
setting a stripe type suppression interference suppression range taking a shielding target as a center;
calculating the frequency modulation slope after the frequency modulation slope modulation in the pressing range;
calculating the frequency shift quantity for modulating the stripe-shaped suppression interference center to the shield target position;
and generating stripe-type suppression interference with the interference center coincident with the position of the shielded target according to the frequency shift quantity.
Preferably, the frequency modulation slope after the variable frequency modulation slope modulation in the pressing range is calculated, and the specific formula is as follows:
Figure BDA0002636639640000021
wherein a is the frequency modulation slope change coefficient, C is the light speed, K is the frequency modulation slope of the original signal, J 1 R is the suppression range, T1 is the time width of the intercepted signal.
Preferably, the specific formula for calculating the frequency shift amount for modulating the stripe-shaped suppression interference center to the shield target position is as follows:
Figure BDA0002636639640000022
where a is a frequency modulation slope change coefficient, K is the frequency modulation slope of the original signal, and T1 is the time width of the intercepted signal.
Preferably, the specific method for generating the front-drag or rear-drag adaptive deception jamming which is initiated at a specified distance from the protected target is as follows:
setting an initial interference distance;
calculating an initial frequency shift amount of the first forwarding pulse according to the initial interference distance;
setting a deception jamming strategy as follows: selecting inter-pulse distance dragging interference, namely taking the initial interference distance as a starting point, dragging backwards or forwards, if the backward dragging frequency quantity is reduced pulse by pulse, and if the forward dragging frequency quantity is increased pulse by pulse;
calculating the secondary frequency shift quantity of the ith pulse;
generating front-drag or back-drag self-adaptive deception jamming which starts from a specified distance from a protected target according to the secondary frequency shift quantity.
Preferably, the set initial interference distance satisfies:
Figure BDA0002636639640000031
wherein J is 2 R 0 For initial interference distance, B is radar signal bandwidth estimation value, K is primary signal frequency modulation slope, T1 is time width of intercepted signal, T 0 For the forwarding delay time of the jammer, B1 is the bandwidth width.
Preferably, the specific formula for calculating the initial frequency shift amount of the first forwarded pulse is:
Figure BDA0002636639640000032
preferably, the maximum value of the forward interference secondary frequency shift quantity is
Figure BDA0002636639640000033
The minimum value of the secondary frequency shift quantity of the backward dragging interference is +.>
Figure BDA0002636639640000034
Preferably, if the N pulse time interference is performed on the radar and the window function with the number of 2N is w, the i-th frequency shift increment of the forward-dragging interference is f Δψmax Xw (i), the i-th shift increment of the backward interference is f Δψmin ×w(i)。
Compared with the prior art, the invention has the remarkable advantages that:
(1) The invention takes the shielding target as the center to form the strip type suppression interference with the settable width, and forms the distance dragging type self-adaptive deception interference with the designated position from the shielding target as the beginning, and the suppression and deception interference can be implemented simultaneously;
(2) According to the invention, interference parameters such as frequency shift quantity and the like of each interference pulse are automatically generated through a preset deception interference distance and a drag strategy;
(3) According to the method, the preset suppression interference range is used for automatically generating the interference parameters such as the frequency shift quantity, the variable tone slope quantity and the like of each interference pulse, so that the recognition and the countermeasures of the radar to the interference are reduced, a good interference effect is achieved, and the protected target is protected.
The present invention will be described in further detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a flow chart of the present invention.
Fig. 2 is a graph comparing pulse pressure results before and after the initial pulse is disturbed.
Fig. 3 is a graph comparing pulse pressure results of multiple pulses before and after disturbance.
Fig. 4 is a comparative top view of the multipulse pulse pressure results before and after disturbance.
Fig. 5 is a graph showing the pulse pressure results of multiple pulses under conventional frequency shifting interference.
Detailed Description
As shown in fig. 1, in the adaptive spoofing suppressing composite interference method based on the DRFM technology, the received radar signal is subjected to pattern interception, the intercepted signal is subjected to frequency shift modulation, and the frequency shift quantity is subjected to secondary modulation in a pulse by utilizing a window function characteristic curve, so that adaptive distance dragging spoofing interference is generated.
Specifically, the frequency shift amount of deception jamming is automatically calculated according to the time width and the bandwidth of the intercepted radar signal and the preset interference position, and the secondary frequency shift amount is generated according to the dragging strategy and the selected window function.
The band-type suppression interference with the shielding target as the center and the settable width is formed by performing frequency shift modulation and frequency modulation slope modulation on the intercepted signal.
Specifically, the frequency shift quantity of suppressing interference is calculated according to the time width and bandwidth of the intercepted radar signal and the position of the shielding target, and the frequency modulation slope modulation quantity is automatically calculated according to the set suppression range.
Further, the method comprises the following specific steps:
step 1: intercepting radar signals and analyzing the radar signals to obtain a wide width T1 and a wide width B1 of the linear frequency modulation signals of the intercepted section;
step 2: calculating the frequency modulation slope K of the intercepted radar signal and giving the forwarding delay time t of the jammer 0 ；
Step 3: the intercepted signals are subjected to frequency shift modulation and frequency change slope modulation at the same time, so that stripe-type suppression interference with the width being set is generated by taking a shielding target as the center; generating front drag or rear drag self-adaptive deception jamming which starts from a specified distance from a protected target by performing frequency shift modulation on the intercepted signal and performing secondary frequency shift modulation according to a drag strategy and a window function;
in a further embodiment, the specific steps of generating the stripe-shaped suppression interference with the shielding target as the center to form the configurable width are as follows:
setting a stripe type suppression interference suppression range J centering on a shield target 1 R。
Calculating the frequency modulation slope k after the modulation of the frequency modulation slope under the pressing range 1 The specific formula is as follows:
Figure BDA0002636639640000041
wherein a is the frequency modulation slope change coefficient, C is the light speed, K is the frequency modulation slope of the original signal, J 1 R is the suppression range, T1 is the time width of the intercepted signal.
Calculating shift frequency of modulating band-type suppression interference center to shield target position
Figure BDA0002636639640000051
The specific formula is as follows:
Figure BDA0002636639640000052
generating a stripe suppression interference J with an interference center coincident with the position of the shielded target according to the frequency shift 1 。
In a further embodiment, the specific method for generating the front-drag or rear-drag adaptive deception jamming with the designated distance from the protected target as the start is as follows:
setting an initial interference distance J 2 R 0 Namely, after radar matching and filtering, the distance from the first interference pulse to the shielded target is positive, the lagged shielded target is negative, the leading target is negative, and the set initial interference distance meets the following conditions:
Figure BDA0002636639640000053
calculating the initial frequency shift of the first forward pulse
Figure BDA0002636639640000054
The specific formula is as follows:
Figure BDA0002636639640000055
wherein the frequency shift range is [ -B1, B ].
And setting a deception jamming strategy, and selecting inter-pulse distance dragging jamming to drag or drag forwards by taking the initial jamming distance as a starting point, wherein if the backward dragging frequency quantity is reduced by pulse, the forward dragging frequency quantity is increased by pulse.
Calculating the secondary frequency shift of the ith pulse
Figure BDA0002636639640000056
The maximum value of the secondary frequency shift quantity of the forward interference is
Figure BDA0002636639640000057
The minimum value of the secondary frequency shift quantity of the backward dragging interference is
Figure BDA0002636639640000058
Let N pulse time interference to radar, window function with number of 2N be w, i-th shift increment of forward-pulling interference be f Δψmax Xw (i), the i-th shift increment of the backward interference is f Δψmin ×w(i)。
Generating front drag or back drag self-adaptive deception jamming J starting from specified distance of shielded target according to secondary frequency shift quantity 2 。
Step 4: and carrying out weighted modulation on the suppression interference and the deception interference to generate composite interference.
Specifically, the generated composite interference is specifically:
Figure BDA0002636639640000061
where n is the number of targets, n E (1, 2, …, K), and α, β is the weight of suppression interference and spoofing interference.
Example 1
Simulation conditions:
parameter design: radar signal bandwidth b=50 MHz, time width t=50us, repetition period prt=250us, sampling rate fs=100 MHz, background noise power p1= -10dB, signal power p2=0 dB, digital frequency storage interception time width t1=25us, waiting for forwarding time T 0 Interference machine and shield target distance radar distance r=15 km, suppressing interference coverage J 1 R=950 m, suppressing the disturbance amplitude modulation α=60 dB, deception disturbance initial distance J from shield target 2 R 0 The rogue amplitude modulation β=30db is found by pulling backward and the frequency-shifting modulation window function w selects the hamming window. The conventional frequency shifting interference frequency shifting quantity is-8.233 MHz.
Simulation results:
fig. 2 shows comparison of pulse pressure results before and after the initial pulse of the radar is interfered, the radar can normally detect the target before being interfered, and after being interfered in a self-adaptive manner, the radar generates a stripe-type suppression interference effect by taking the shielded target as the center, and a deception interference effect is generated at a position 5km away from the shielded target. Fig. 3 and fig. 4 show pulse pressure results of multiple pulses before and after interference, compared with simulated three-dimensional diagrams and top views, targets can be normally detected by a radar before interference, and after self-adaptive interference, a strip type suppression interference effect continuously exists in 32 pulse duration time by taking a shielded target as a center, and deceptive interference generated at a position 5km away from the shielded target is dragged backwards pulse by pulse. Fig. 5 shows the result of pulse pressure of multiple pulses under conventional frequency-shifting interference, which is easily recognized by a radar, and the effect of spoofing interference is generated at a distance of 5km from a shield target.

Claims (8)

1. The adaptive spoofing suppressing composite interference method based on the DRFM technology is characterized by comprising the following steps of:
intercepting a received radar signal, performing frequency shift modulation on the intercepted signal, performing secondary modulation on a frequency shift quantity in a pulse by utilizing a window function characteristic curve, and generating distance dragging self-adaptive deception jamming, wherein the specific method for generating the distance dragging self-adaptive deception jamming comprises the following steps of:
setting a stripe type suppression interference suppression range taking a shielding target as a center;
the frequency modulation slope after the modulation of the down-conversion frequency modulation slope in the pressing range is calculated, and the specific formula is as follows:
Figure FDA0004212321030000011
wherein a is the frequency modulation slope change coefficient, C is the light speed, K is the frequency modulation slope of the original signal, J 1 R is a pressing range, and T1 is the time width of intercepting signals;
calculating the frequency shift quantity for modulating the stripe-shaped suppression interference center to the shield target position;
generating a stripe suppression interference with an interference center coincident with the position of the shielded target according to the frequency shift quantity;
performing frequency shift modulation on the intercepted signal and simultaneously performing frequency shift slope modulation on the intercepted signal to generate stripe-type suppression interference with a settable width by taking a shielding target as a center;
and carrying out weighted modulation on the suppression interference and the deception interference to generate composite interference.
2. The adaptive spoofing suppressing composite interference method based on the DRFM technique according to claim 1, wherein the specific steps are as follows:
intercepting radar signals and analyzing the radar signals to obtain the time width and the bandwidth width of the linear frequency modulation signals of the intercepted section;
calculating the frequency modulation slope of the intercepted radar signal;
the intercepted signals are subjected to frequency shift modulation and frequency change slope modulation at the same time, so that stripe-type suppression interference with the width being set is generated by taking a shielding target as the center; generating front drag or rear drag self-adaptive deception jamming which starts from a specified distance from a protected target by performing frequency shift modulation on the intercepted signal and performing secondary frequency shift modulation according to a drag strategy and a window function;
and carrying out weighted modulation on the suppression interference and the deception interference to generate composite interference.
3. The adaptive spoofing-suppressing composite interference method based on the DRFM technique of claim 1, wherein the specific formula for calculating the shift amount for modulating the stripe-shaped suppressed interference center to the shield target position is:
Figure FDA0004212321030000012
wherein a is a frequency modulation slope change coefficient, K is the frequency modulation slope of the original signal, T1 is the time width of the intercepted signal, T 0 And forwarding delay time for the jammer.
4. The adaptive spoofing suppressing composite interference method based on the DRFM technique of claim 1, wherein the specific method of generating the front-drag or rear-drag adaptive spoofing interference starting at a specified distance from the protected target is:
setting an initial interference distance;
calculating an initial frequency shift amount of the first forwarding pulse according to the initial interference distance;
setting a deception jamming strategy as follows: selecting inter-pulse distance dragging interference, namely taking the initial interference distance as a starting point, dragging backwards or forwards, if the backward dragging frequency quantity is reduced pulse by pulse, and if the forward dragging frequency quantity is increased pulse by pulse;
calculating the secondary frequency shift quantity of the ith pulse;
generating front-drag or back-drag self-adaptive deception jamming which starts from a specified distance from a protected target according to the secondary frequency shift quantity.
5. The adaptive spoofing-suppressing composite interference method based on the DRFM technique of claim 4, wherein the set initial interference distance satisfies:
Figure FDA0004212321030000021
wherein J is 2 R 0 For initial interference distance, B is radar signal bandwidth estimation value, K is primary signal frequency modulation slope, T1 is time width of intercepted signal, T 0 For the forwarding delay time of the jammer, B1 is the bandwidth width.
6. The adaptive spoofing-suppressing composite interference method based on the DRFM technique of claim 4 wherein the specific formula for calculating the initial frequency shift amount of the first forwarded pulse is:
Figure FDA0004212321030000022
t 0 for the forwarding delay time of the jammer, T1 is the time width of the intercepted signal, J 2 R 0 For the initial interference distance, K is the frequency modulation slope of the original signal.
7. According to claim 4The adaptive deception suppression composite interference method based on the DRFM technology is characterized in that the maximum value of the forward-dragging interference secondary frequency shift quantity is
Figure FDA0004212321030000023
The minimum value of the secondary frequency shift quantity of the backward dragging interference is
Figure FDA0004212321030000024
B is radar signal bandwidth estimation value, +.>
Figure FDA0004212321030000025
For the initial amount of frequency shift of the first forwarded pulse, B1 is the bandwidth width.
8. The adaptive spoofing suppressing composite interference method based on DRFM technology as defined in claim 7, wherein if the window function with the number of 2N is w, the i-th shift increment of the forward pulling interference is f Δψmax Xw (i), the i-th shift increment of the backward interference is f Δψmin ×w(i)。
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