CN112180331A - Adaptive radio frequency shielding pulse frequency point strategy scheduling method - Google Patents
Adaptive radio frequency shielding pulse frequency point strategy scheduling method Download PDFInfo
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- CN112180331A CN112180331A CN202011048261.2A CN202011048261A CN112180331A CN 112180331 A CN112180331 A CN 112180331A CN 202011048261 A CN202011048261 A CN 202011048261A CN 112180331 A CN112180331 A CN 112180331A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000003044 adaptive effect Effects 0.000 title description 7
- 238000001514 detection method Methods 0.000 claims abstract description 35
- 238000012545 processing Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 abstract description 4
- 238000011156 evaluation Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000010223 real-time analysis Methods 0.000 description 1
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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
Abstract
The invention discloses a strategy scheduling method for self-adaptive radio frequency shielding pulse frequency points, which can realize on-line evaluation of radio frequency shielding effect and self-adaptive selection of detection and shielding frequency points. The invention comprises the following steps: the radar realizes interference frequency point statistics based on the broadband reconnaissance channel; selecting a radar detection signal frequency point and a shield frequency point according to the statistical result; the radar transmits detection and shielding pulses in a time-sharing manner, and simultaneously sets a central frequency point of a broadband reconnaissance receiving channel; and resetting the detection and radio frequency shielding frequency points according to the detection result of each channel interference signal. The invention can effectively improve the automation level of the radar for actively resisting interference during radio frequency shield, improve the success probability of radio frequency shield and enhance the steady target detection capability of the radar in a complex electromagnetic environment.
Description
Technical Field
The invention relates to the technical field of radar anti-interference.
Background
The radio frequency shield is used as an anti-interference means for fully showing the advantages of active behaviors of the radar, has the outstanding characteristics of simple engineering realization, excellent anti-interference performance and the like, and is one of important means for active waveform anti-interference diversity. The electronic warfare equipment needs timely and correct reconnaissance guidance aiming at effective interference of radars of various systems, and the reconnaissance guidance depends on the characteristic of correctly intercepting radar working signals. Therefore, the radar consciously deals with the complex threat signal environment, causing the loss and error of reconnaissance guidance, and is an effective active anti-interference means.
In order to improve interference efficiency, modern electronic warfare equipment usually adopts a forward type interference pattern based on a radio frequency memory, aiming at the defects that the interference channel resources of the electronic warfare equipment are limited and no manual intervention exists in missile-borne and part of airborne interference equipment, a radar transmits false decoy pulses to shield a real detection signal, the decoy pulses can obviously improve the pulse intensity and the signal staggering degree intercepted by an electronic warfare reconnaissance receiver, so that the PDW extraction difficulty and the pulse parameter measurement error of the electronic warfare equipment are caused, the interference frequency and the waveform are guided to lock the shield signal, the real detection signal of the radar is protected from being interfered or is prevented from being interfered as little as possible, and the purpose of effective interference countermeasure is achieved.
With the rapid development of electronic warfare technology, active interference to radar is more and more diversified and adaptive, while most of the existing radio frequency shielding technology adopts a certain fixed shielding strategy and signal parameters, when the strategy and environment of an interfering party are changed, if the shielding strategy and the shielding parameters cannot be timely and reasonably adjusted, the anti-interference effect of radio frequency shielding is sharply reduced, and the active anti-interference performance of the radar is seriously reduced. For the radar with the independent broadband reconnaissance array surface, the parameters of the radio frequency shield system can be automatically adjusted based on the real-time analysis of the interference environment and the current working state of the radar equipment, so that the flexible self-adaption to the interference environment is realized.
Disclosure of Invention
The invention provides a self-adaptive radio frequency shielding pulse frequency point strategy scheduling method, aiming at overcoming the problem that the radio frequency shielding pulse frequency point is difficult to optimize on line in the process of confronting a radar with electronic warfare equipment, and realizing radio frequency shielding effect evaluation through an electromagnetic spectrum sensing result based on a broadband reconnaissance channel and detection results of interference of the detection and radio frequency shielding frequency point.
The invention is realized as follows:
s1: interference frequency point statistics based on broadband reconnaissance channels: carrying out segmented Fourier transform processing on the data received by the broadband reconnaissance channel, and counting the interference intensity of each working frequency point of the radar;
s2: selecting a radar detection signal frequency point and a radio frequency shielding frequency point: setting a frequency point with the maximum interference intensity as a radio frequency shielding frequency point, setting a frequency point with the minimum interference intensity as a detection frequency point, and transmitting time-sharing shielding and detection pulses;
s3: emitting detection and shielding signals and setting a central frequency point of a broadband reconnaissance receiving channel: carrying out channelization processing on the broadband reconnaissance receiving channel, wherein the number of the channels is the same as that of the transmitting frequency points, and the frequency point values are respectively set as detection and radio frequency shielding frequency points;
s4: and judging whether the radio frequency shielding is successfully carried out according to the processing of the receiving channel: counting the number of interference pulses and the interference duty ratio of the received signals of each channel to judge whether the received signals are subjected to the forwarding interference, if the shielding frequency point channel is subjected to the interference and the detection frequency point channel is not subjected to the interference, indicating that the shielding is successful, and turning to the step S5; if not, go to step S1;
s5: maintaining current probing and shielding frequency points: if the radio frequency shield is successful, the currently set detection frequency point value and the radio frequency shield frequency point value are maintained, and the process goes to step S3.
According to the adaptive radio frequency shielding pulse frequency point strategy scheduling method provided by the invention, the automation level of radio frequency shielding active anti-interference of the radar is effectively improved through the adaptive frequency point scheduling method for on-line estimation of the shielding effect, the success probability of radio frequency shielding is improved, and the target steady detection capability of the radar in a complex electromagnetic environment is enhanced.
Drawings
FIG. 1 is a schematic diagram of a time-sharing RF shield pulse. Wherein f is1To shield the frequency points of the pulses, f2For detecting frequency points of pulses, and f1And f2Differing by more than 1 probe bandwidth.
Fig. 2 is a flowchart of a method for scheduling an adaptive rf shield pulse frequency point strategy. Wherein: the S1-S5 in the figure correspond to the S1-S5 processes, respectively, as described in the summary of the invention.
Detailed Description
The implementation process of the adaptive radio frequency shield pulse frequency point strategy scheduling method provided by the invention is shown in fig. 2 and specifically described as the following process:
s1 interference frequency point statistics based on the broadband reconnaissance channel: and carrying out segmented Fourier transform processing on the data received by the broadband reconnaissance channel, and counting the interference intensity of each working frequency point of the radar.
Assuming that the total L points of the broadband reconnaissance beam data in one echo receiving period are L points, N-point non-overlapping segmented Fourier transform is carried out, and the received data is divided into
Segment, let the mth segment of N point data be marked as xm(n), taking the Fourier transform result as the modulus
Averaging the M N-point Fourier transform modulus values, i.e.
Let the central frequency point of the broadband reconnaissance channel be f0And a sampling rate of fsThen the working frequency point of the radar can be obtained
The interference intensity of (a) is z (k), k is 1, 2.
S2, selecting a radar detection signal frequency point and a radio frequency shielding frequency point: setting the frequency point with the maximum interference intensity as a radio frequency shielding frequency point, setting the frequency point with the minimum interference intensity as a detection frequency point, and transmitting time-sharing shielding and detection pulses.
According to the interference intensity z (k) of each working frequency point obtained in the step S1, the frequency point corresponding to the maximum value z (k) is recorded as f1And set as a masking pulse frequency point, the frequency point corresponding to the minimum value of z (k) is f2And set as the frequency point of the detection signal, transmit the time-sharing shielding and detection pulse.
S3, emitting detection and shield signals and setting the center frequency point of the broadband reconnaissance receiving channel: channelizing the broadband reconnaissance receiving channel, setting the number of the channels to be the same as that of the transmitting frequency points, and setting the frequency point values to be radio frequency shielding frequency points f1And a probing frequency f2The channel bandwidth is the detection pulse bandwidth and the shielding pulse respectivelyBandwidth.
S4, judging whether the radio frequency shield is successfully carried out according to the received channel processing: counting the number of interference pulses and the interference duty ratio of the received signals of each channel to judge whether the received signals are subjected to the forwarding interference, if the shielding frequency point channel is subjected to the interference and the detection frequency point channel is not subjected to the interference, indicating that the shielding is successful, and turning to the step S5; if not, go to step S1.
Let the received data of each channel be s (N), N be 1, …, N, and the radar nominal noise power be P, and perform envelope detection on the data module value sequence | s (N) | to obtain a flag bit sequence:
wherein T is1Is the noise threshold factor. Counting the number of the mark bit sequence f (n) with the median value of 1 as Q, and calculating the interference duty ratio as
The number of glitch pulses is counted based on the detected number of rising edges of the pulses, and when f (n-1) is 0, f (n +1) is 1, and f (n +2) is 1, the number is counted as the rising edge of the glitch pulse y. The value of the interfered flag psi of the channel can be obtained as
Wherein T is2Is the duty cycle threshold and T3For the number threshold of interference pulses, the statistical result of the channel interference duty ratio of the shield frequency point is recorded as psi1And the statistical result of the channel interference duty ratio of the sounding frequency point is psi2If t is11 and Ψ2If the result is 0, the process goes to step S5, otherwise, the process goes to step S1.
S5 maintains the current probing and shielding frequency points: if the radio frequency shield is successful, the currently set detection frequency point value and the radio frequency shield frequency point value are maintained, and the process goes to step S3.
Claims (1)
1. A self-adaptive radio frequency shielding pulse frequency point strategy scheduling method is characterized in that:
s1: interference frequency point statistics based on broadband reconnaissance channels: carrying out segmented Fourier transform processing on the data received by the broadband reconnaissance channel, and counting the interference intensity of each working frequency point of the radar;
s2: selecting a radar detection signal frequency point and a radio frequency shielding frequency point: setting a frequency point with the maximum interference intensity as a radio frequency shielding frequency point, setting a frequency point with the minimum interference intensity as a detection frequency point, and transmitting time-sharing shielding and detection pulses;
s3: emitting detection and shielding signals and setting a central frequency point of a broadband reconnaissance receiving channel: carrying out channelization processing on the broadband reconnaissance receiving channel, wherein the number of the channels is the same as that of the transmitting frequency points, and the frequency point values are respectively set as detection and radio frequency shielding frequency points;
s4: and judging whether the radio frequency shielding is successfully carried out according to the processing of the receiving channel: counting the number of interference pulses and the interference duty ratio of the received signals of each channel to judge whether the received signals are subjected to the forwarding interference, if the shielding frequency point channel is subjected to the interference and the detection frequency point channel is not subjected to the interference, indicating that the shielding is successful, and turning to the step S5; if not, go to step S1;
s5: maintaining current probing and shielding frequency points: if the radio frequency shield is successful, the currently set detection frequency point value and the radio frequency shield frequency point value are maintained, and the process goes to step S3.
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| CN113395129A (en) * | 2021-05-19 | 2021-09-14 | 桂林理工大学 | Decoy-assisted hidden anti-interference method, device and storage medium |
| CN115639526A (en) * | 2021-07-19 | 2023-01-24 | 湖南迈克森伟电子科技有限公司 | Radio anti-interference method and system for detection radar |
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| CN115639526A (en) * | 2021-07-19 | 2023-01-24 | 湖南迈克森伟电子科技有限公司 | Radio anti-interference method and system for detection radar |
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