CN116819430A - Direction finding method for same-frequency signal under strong radiation source background - Google Patents
Direction finding method for same-frequency signal under strong radiation source background 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
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
- G01S3/14—Systems for determining direction or deviation from predetermined direction
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Abstract
The invention relates to a direction finding method of co-frequency signals under a strong radiation source background, and belongs to the technical field of radio direction finding. The invention uses the signal received by the antenna with the largest signal power as the template to process the correlation, and matches the correlation vector at the peak position of the synthesized correlation sequence with each direction vector in the direction vector set, and determines the direction corresponding to the maximum value in the matched value set as the interference source direction finding result at the peak position of the synthesized correlation sequence, thereby realizing the purpose of direction finding of the interference source under the co-location condition of the direction finding equipment and the strong radiation source.
Description
Technical Field
The invention belongs to the technical field of radio direction finding, and particularly relates to a direction finding method of co-frequency signals under a strong radiation source background.
Background
The radio spectrum has huge economic value, social value and national defense and military value, and as the role of radio serving as a carrier of equipment such as broadcasting, communication, radar and the like in the aspects of information transmission, target monitoring and the like is increasingly important, the situation of intentional or unintentional radio interference is also more and more encountered, and the threat formed by various radio interference sources on the equipment such as radio communication, radar and the like is also more and more serious.
At present, there are many methods for detecting signals and determining the direction of incoming waves of signals, including interferometer direction finding, conventional beam forming direction finding, adaptive beam forming direction finding, high-resolution spatial spectrum direction finding and the like. However, in the case where the direction-finding device and the strong radiation source are co-located, that is, when the direction-finding device operates near the strong radiation source, the direction-finding device that detects the signal radiated by the interference source and determines the incoming wave direction of the signal radiated by the interference source generally only operates in a time domain and a frequency domain different from those of the co-located strong radiation source. When the direction-finding equipment works in the same time domain and frequency domain with the co-located strong radiation source, the signal amplitude of the remote interference source radiation received by the direction-finding equipment is far smaller than the signal amplitude of the close-range co-located strong radiation received by the direction-finding equipment due to the influence of the far-near effect, so that detection signals of the interferometer, the conventional beam forming and other methods for determining the signal incoming wave direction can only detect the signals of the co-located strong radiation source and determine the signal incoming wave direction of the co-located strong radiation source, and the detection signals of the interference source radiation and the signal incoming wave direction determination of the interference source radiation are difficult to detect, and the capability of the direction-finding equipment for detecting the signals and determining the signal incoming wave direction is limited. Therefore, the problem of direction finding of the interference source when the direction finding device and the strong radiation source work in the same time domain and frequency domain under the condition of co-locating the direction finding device and the strong radiation source is needed to be solved, so that the requirements of effectively dealing with the threat of the interference source in real time and timely taking corresponding countermeasures are met.
Disclosure of Invention
First, the technical problem to be solved
The invention aims to solve the technical problem of how to provide a direction finding method of the same-frequency signal under the background of a strong radiation source so as to solve the problems that an interference source is difficult to detect and difficult to find due to the fact that the signal of the strong radiation source is far stronger than the interference signal under the co-location condition of direction finding equipment and the strong radiation source.
(II) technical scheme
In order to solve the technical problems, the invention provides a direction finding method of common-frequency signals under the background of a strong radiation source, which comprises the following steps:
s1, setting the number of horn antennas, the number of searched directions and the number of searched directions, wherein the number of the horn antennas, the number of the searched directions and the number of the direction vectors are set, the number of samples of signals and the number of peak position sets are acquired according to a sampling period, wherein the number of the horn antennas, the number of the searched directions and the number of the searched directions are set, and the direction vectors correspond to the searched direction sets one by one;
s2, under the condition that the direction-finding equipment and the strong radiation source are co-located, collecting signals received by all antennas of the direction-finding equipment, and determining the signal power received by each antenna, thereby determining the signal received by the antenna with the largest signal power;
s3, determining signal correlation sequences received by all antennas by taking signals received by the antenna with the largest signal power as a template, further determining a synthesized correlation sequence, and determining the top K highest peak positions except the highest peak of the synthesized correlation sequence;
s4, determining corresponding correlation vectors according to peak positions of the synthesized correlation sequences, matching the correlation vectors with each direction vector in a direction vector set, determining matching values at the peak positions of the synthesized correlation sequences, wherein the direction corresponding to the maximum value in the matching value set is an interference source direction finding result at the peak positions of the synthesized correlation sequences, and further determining the interference source direction finding result under the condition that the direction finding equipment and the strong radiation source are co-located.
(III) beneficial effects
The invention provides a direction finding method of the same-frequency signal under the background of a strong radiation source, which has the beneficial effects that: the direction-finding method for the same-frequency signal under the background of the strong radiation source provided by the invention has the advantages that the direction-finding equipment circular array formed by the horn antennas is used for receiving the signal, so that the influence of the strong radiation source signal on the signal received by the horn antennas which enter from non-main lobes can be inhibited under the condition that the strong radiation source signal suppresses the pulse signal radiated by the interference source, and the detection performance of the interference source is improved; and carrying out correlation processing by taking a signal received by the horn antenna with the maximum signal power as a template, and matching a correlation vector at the peak position of the synthesized correlation sequence with each direction vector in the direction vector set to obtain the signal-to-noise ratio gain of passive matched filtering processing and improve the direction finding performance of an interference source. Therefore, the invention can be used for the direction finding of the interference source when the direction finding device and the strong radiation source work in the same time domain and frequency domain under the co-location condition of the direction finding device and the strong radiation source, and provides the detection and direction finding information of the interference source for effectively dealing with the threat of the interference source in real time and timely taking corresponding countermeasures.
Detailed Description
To make the objects, contents and advantages of the present invention more apparent, the following detailed description of the present invention will be given with reference to examples.
The invention aims at the problems that the interference source is difficult to detect and difficult to detect because the strong radiation source signal is far stronger than the interference signal under the co-location condition of the direction-finding equipment and the strong radiation source, the signal is received by a circular array of the direction-finding equipment formed by horn antennas, the signal received by the antenna with the largest signal power is used as a template for carrying out correlation processing, the correlation vector at the peak position of the synthesized correlation sequence is matched with each direction vector in the direction vector set, and the direction corresponding to the maximum value in the matched value set is determined as the interference source direction-finding result at the peak position of the synthesized correlation sequence, thereby realizing the purpose of direction-finding the interference source under the co-location condition of the direction-finding equipment and the strong radiation source.
The technical scheme of the invention is as follows:
a method for direction finding of co-frequency signals in a strong radiation source background, the method comprising:
s1, setting the number of horn antennas, the number of searched directions and the number of searched directions, wherein the number of the horn antennas, the number of the searched directions and the number of the direction vectors are set, the number of samples of signals and the number of peak position sets are acquired according to a sampling period, wherein the number of the horn antennas, the number of the searched directions and the number of the searched directions are set, and the direction vectors correspond to the searched direction sets one by one;
s2, under the condition that the direction-finding equipment and the strong radiation source are co-located, collecting signals received by all antennas of the direction-finding equipment, and determining the signal power received by each antenna, thereby determining the signal received by the antenna with the largest signal power;
s3, determining signal correlation sequences received by all antennas by taking signals received by the antenna with the largest signal power as a template, further determining a synthesized correlation sequence, and determining the top K highest peak positions except the highest peak of the synthesized correlation sequence;
s4, determining corresponding correlation vectors according to peak positions of the synthesized correlation sequences, matching the correlation vectors with each direction vector in a direction vector set, determining matching values at the peak positions of the synthesized correlation sequences, wherein the direction corresponding to the maximum value in the matching value set is an interference source direction finding result at the peak positions of the synthesized correlation sequences, and further determining the interference source direction finding result under the condition that the direction finding equipment and the strong radiation source are co-located.
The method specifically comprises the following steps:
s1, setting the number M of horn antennas forming a circular array of direction finding equipment, the number N of searched directions and a set { theta } of searched directions 1 ,θ 2 ,…,θ N A set of direction vectors corresponding to the searched direction set one by one is { a (θ) 1 ),a(θ 2 ),……,a(θ N ) Collecting the number K of peak position sets according to the number L of samples of the signal in a sampling period;
s2, under the condition that the direction-finding equipment and the strong radiation source are co-located, signals received by all antennas of the direction-finding equipment are collected, the signals are M multiplied by L order matrix X, and the power of the signals received by the M th antenna is determined:
p(m)＝||X(m,1:L)||
wherein X (M, 1:L) is the M-th row vector of matrix X, i is the norm of the vector, m=1, 2, …, M; thereby determining the signal received by the antenna with the largest signal power asWherein the method comprises the steps of
An antenna number indicating the maximum power of the received signal;
s3, receiving signals by the antenna with the largest signal powerAs a template, determining a correlation sequence of a signal received by an mth antenna, which is:
wherein the FFT and IFFT are fast Fourier transform and inverse fast Fourier transform, () * For conjugation, as would be the case if the corresponding elements were multiplied by one another, m=1, 2, …, M; further determining the synthesis related sequence as
And determining the top K highest peak positions t of the synthesized correlation sequence h (1:L) except for the highest peak 1 ,t 2 ,…,t K ；
S4, synthesizing a peak value position t of the correlation sequence k K=1, 2, …, K, and the corresponding correlation vector is determined to be q (1:m, t k ) And each direction vector a (θ n ) N=1, 2, …, N, and determining the peak position t of the synthesized correlation sequence k The matching value at is
g(θ n ,t k )＝|q(1:M,t k )a(θ n )|
Wherein || is an absolute value;
match value set { g m (θ 1 ,t k ),g(θ 2 ,t k ),…,g(θ N ,t k ) The direction corresponding to the maximum value in the sequence is the peak value position t of the synthesized correlation sequence k The direction finding result at the position is recorded asFurther determining that the interference source direction finding result under the condition that the direction finding device and the strong radiation source are co-located is +.>
Example 1:
the utility of the present invention is analyzed in connection with the following examples.
Examples: in this example, the number m=8 of horns forming the circular array of the direction-finding device, the number n=360 of directions searched, and the sets {0,1, …,359} degrees of directions searched, and the sets formed by direction vectors corresponding to the sets of directions searched in one-to-one correspondence are set as { a (0), a (1), … …, a (359) }, the number l=256 of samples of the signal is collected according to the sampling period, and the number k=2 of peak position sets are set; under the co-location condition of the direction-finding equipment and the strong radiation source, the incoming wave direction of the strong radiation source signal is 180 degrees and the signal-to-noise ratio is 26dB relative to the direction-finding equipment; the incoming wave direction of the pulse signal radiated by the interference source is 90 degrees, and the signal-to-noise ratio is 0dB; it can be seen that when the signal reaches the direction-finding device, the strong radiation source signal is 26dB stronger than the pulsed signal power radiated by the interference source. The strong radiation source signal is a linear frequency modulation signal, the bandwidth is 5MHz, and the pulse width is 10us; the pulse signal radiated by the interference source is also a linear frequency modulation signal, the bandwidth is 5MHz, and the pulse width is 10us; the pulse signal radiated by the interference source is completely overlapped with the strong radiation source signal in the frequency domain and is overlapped with the strong radiation source signal by 1/4 in the time domain.
Under the co-location condition of the direction-finding equipment and the strong radiation source, signals received by all antennas of the direction-finding equipment are collected and are 8 multiplied by 256-order matrixes, detection signals such as interferometer direction finding, conventional beam forming direction finding, self-adaptive beam forming direction finding, high-resolution spatial spectrum direction finding and the like are utilized, the method for determining the signal incoming wave direction can only detect the co-location strong radiation source signals, the co-location strong radiation signal incoming wave direction is determined to be 180 degrees, signals radiated by an interference source are difficult to detect, and the signal incoming wave direction radiated by the interference source is determined; by adopting the method, the signal radiated by the interference source can be detected, the incoming wave direction of the signal radiated by the interference source is 90 degrees, and the purpose of direction finding of the interference source under the co-location condition of the direction finding equipment and the strong radiation source is realized.
The beneficial effects of the invention are as follows: the direction-finding method for the same-frequency signal under the background of the strong radiation source provided by the invention has the advantages that the direction-finding equipment circular array formed by the horn antennas is used for receiving the signal, so that the influence of the strong radiation source signal on the signal received by the horn antennas which enter from non-main lobes can be inhibited under the condition that the strong radiation source signal suppresses the pulse signal radiated by the interference source, and the detection performance of the interference source is improved; and carrying out correlation processing by taking a signal received by the horn antenna with the maximum signal power as a template, and matching a correlation vector at the peak position of the synthesized correlation sequence with each direction vector in the direction vector set to obtain the signal-to-noise ratio gain of passive matched filtering processing and improve the direction finding performance of an interference source. Therefore, the invention can be used for the direction finding of the interference source when the direction finding device and the strong radiation source work in the same time domain and frequency domain under the co-location condition of the direction finding device and the strong radiation source, and provides the detection and direction finding information of the interference source for effectively dealing with the threat of the interference source in real time and timely taking corresponding countermeasures.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (10)
1. A method for direction finding of co-frequency signals in a strong radiation source background, the method comprising the steps of:
s1, setting the number of horn antennas, the number of searched directions and the number of searched directions, wherein the number of the horn antennas, the number of the searched directions and the number of the direction vectors are set, the number of samples of signals and the number of peak position sets are acquired according to a sampling period, wherein the number of the horn antennas, the number of the searched directions and the number of the searched directions are set, and the direction vectors correspond to the searched direction sets one by one;
s2, under the condition that the direction-finding equipment and the strong radiation source are co-located, collecting signals received by all antennas of the direction-finding equipment, and determining the signal power received by each antenna, thereby determining the signal received by the antenna with the largest signal power;
s3, determining signal correlation sequences received by all antennas by taking signals received by the antenna with the largest signal power as a template, further determining a synthesized correlation sequence, and determining the top K highest peak positions except the highest peak of the synthesized correlation sequence;
s4, determining corresponding correlation vectors according to peak positions of the synthesized correlation sequences, matching the correlation vectors with each direction vector in a direction vector set, determining matching values at the peak positions of the synthesized correlation sequences, wherein the direction corresponding to the maximum value in the matching value set is an interference source direction finding result at the peak positions of the synthesized correlation sequences, and further determining the interference source direction finding result under the condition that the direction finding equipment and the strong radiation source are co-located.
2. The method for direction finding of co-frequency signals in the background of a strong radiation source according to claim 1, wherein said step S1 specifically comprises: setting the number M of horn antennas forming a circular array of the direction finding equipment, the number N of searched directions and the set { theta ] of the searched directions 1 ,θ 2 ,…,θ N A set of direction vectors corresponding to the searched direction set one by one is { a (θ) 1 ),a(θ 2 ),……,a(θ N ) And acquiring the number K of peak position sets according to the number L of samples of the signal in the sampling period.
3. The method for direction finding of co-frequency signals in the context of a strong radiation source according to claim 2, wherein the number of horn antennas constituting the circular array of direction finding devices M = 8.
4. The method for direction finding of co-frequency signals in a strong radiation source background according to claim 2, wherein the number of directions searched is n=360, and the set of directions searched is {0,1, …,359} degrees.
5. The method of claim 4, wherein the set of directional vectors corresponding to the set of directions searched for is { a (0), a (1), … …, a (359) }.
6. The method for direction finding of co-frequency signals in a strong radiation source background according to claim 2, wherein the number of samples of the signal L = 256 is acquired according to a sampling period.
7. The method for direction finding of co-frequency signals in a strong radiation source background according to claim 2, wherein the number of peak position sets K = 2.
8. The method for direction finding of co-frequency signals in the context of a strong radiation source according to any one of claims 1 to 7, wherein said step S2 comprises:
under the condition that the direction-finding equipment and the strong radiation source are co-located, signals received by all antennas of the direction-finding equipment are collected, the signals are M multiplied by L order matrix X, and the power of the signals received by the mth antenna is determined:
p(m)＝||X(m,1:L)||
wherein X (M, 1:L) is the M-th row vector of matrix X, i is the norm of the vector, m=1, 2, …, M; thereby determining the signal received by the antenna with the largest signal power asWherein the method comprises the steps of
The antenna number indicating the maximum power of the received signal.
9. The method for direction finding of co-frequency signals in the background of strong radiation source according to claim 8, wherein said step S3 specifically comprises:
signals received by antennas with maximum signal powerAs a template, determining a correlation sequence of a signal received by an mth antenna, which is:
wherein the FFT and IFFT are fast Fourier transform and inverse fast Fourier transform, () * For conjugation, as would be the case if the corresponding elements were multiplied by one another, m=1, 2, …, M; further determining the synthesis related sequence as
And determining the top K highest peak positions t of the synthesized correlation sequence h (1:L) except for the highest peak 1 ,t 2 ,…,t K 。
10. The method for direction finding of co-frequency signals in the background of strong radiation source according to claim 9, wherein said step S4 specifically comprises:
from the peak position t of the synthesized correlation sequence k K=1, 2, …, K, and the corresponding correlation vector is determined to be q (1:m, t k ) And each direction vector a (θ n ) N=1, 2, …, N, and determining the peak position t of the synthesized correlation sequence k The matching value at is
g(θ n ,t k )＝|q(1:M,t k )a(θ n )|
Wherein || is an absolute value;
matching value set { g (θ) 1 ,t k ),g(θ 2 ,t k ),…,g(θ N ,t k ) The direction corresponding to the maximum value in the sequence is the peak value position t of the synthesized correlation sequence k The direction finding result at the position is recorded asFurther determining that the interference source direction finding result under the condition that the direction finding device and the strong radiation source are co-located is +.>
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