CN104868946A - Adaptive weighted interference suppression method of subarray level mixed MIMO-phased array system - Google Patents

Adaptive weighted interference suppression method of subarray level mixed MIMO-phased array system Download PDF

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CN104868946A
CN104868946A CN201510324632.8A CN201510324632A CN104868946A CN 104868946 A CN104868946 A CN 104868946A CN 201510324632 A CN201510324632 A CN 201510324632A CN 104868946 A CN104868946 A CN 104868946A
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mimo
interference
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CN104868946B (en
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胡航
宋柯
牟成虎
李绍滨
郭林丽
李毓琦
狄晶莹
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Harbin Institute of Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

An adaptive weighted interference suppression method of a subarray level mixed MIMO-phased array system belongs to the field of the subarray level mixed MIMO-phased array system and is used for solving the problem of adaptive interference suppression of the subarray level mixed MIMO-phased array system. The adaptive weighted interference suppression method of a subarray level mixed MIMO-phased array system of the invention comprises the steps as follows: firstly establishing the subarray level mixed MIMO-phased array system, obtaining an adaptive weight of the subarray level mixed MIMO-phased array system by using a steering vector of a virtual array and an estimated value of an interference and noise covariance matrix outputted by the virtual array, and weighting an interference and noise signal outputted by the virtual array of the subarray level mixed MIMO-phased array system so as to achieve the adaptive interference suppression of the subarray level mixed MIMO-phased array system.

Description

The disturbance restraining method of adaptive weighted Subarray mixing MIMO-phased array system
Technical field
The invention belongs to Subarray mixing MIMO-phased array system field.
Background technology
Subarray mixing MIMO-phased array system is by MIMO (Multiple-Input Multiple-Output, Multiple input-output) system and phased array system carry out the new system of one that combines, and it can overcome some limitations of existing mimo system and phased array system.
MIMO is a kind of emerging system, is study hotspot very active both at home and abroad at present.Its advantage is normally compared with traditional phased array system.Mimo system has greater advantage compared with phased array system, as better detection perform, higher directional resolution and estimated accuracy, and robustness etc. stronger under electronic countermeasures and multi-path environment.
But mimo system also has some limitations compared with phased array system, comprise: 1, each bay launches orthogonal signalling, do not possess the coherent processing gain of phased array system, thus produce beam shape loss, and performance declines to some extent when Target scatter section area declines.2, signal to noise ratio (SNR) loss is produced, affect target detection and Parameter Estimation Precision etc., although this SNR loss of mimo system compensates by increasing accumulated time, but due to limited Coherent processing time and propagation path loss etc. in application, this method has very large limitation.3, contemporary electronic systems often comprises hundreds of to thousands of bay, and as direct using MIMO system, then need much independently transmit and adopt thousands of digital channel at receiving terminal, this all cannot bear in hardware cost and algorithm computing cost; And for obtaining suitable transmitting, need the optimization problem huge to dimension solve.
Subarray mixing MIMO-phased array system overcomes the above-mentioned limitation of mimo system, effectively can reduce hardware cost and computing cost.It, while maintenance mimo system has superiority, also has the ability of the coherent processing gain of phased array system.But Subarray mixing MIMO-phased array system also just begins one's study at present, a lot of problem is had to need to solve, the problem of such as adaptive interference mitigation.
Summary of the invention
The present invention is the problem of the adaptive interference mitigation in order to solve Subarray mixing MIMO-phased array system, now provides the disturbance restraining method of adaptive weighted Subarray mixing MIMO-phased array system.
The disturbance restraining method of adaptive weighted Subarray mixing MIMO-phased array system, the method is:
Set up Subarray mixing MIMO-phased array system, this system comprises launches battle array and receives battle array, and transmitting battle array is identical with the structure receiving battle array, receive battle array and comprise N number of array element, this N number of array element is divided into L submatrix, the distance of adjacent two array elements is half operation wavelength, and the interference plus noise signals of the output of each submatrix all carries out matched filtering by L matched filter, N and L is positive integer;
If the array element level guiding vector receiving battle array is the submatrix transition matrix of array is T, utilizes the submatrix transition matrix T of array and receives the array element level guiding vector of battle array obtain the guiding vector receiving battle array according to the guiding vector receiving battle array obtain the guiding vector of virtual array wherein θ represents the angle of pitch, represent azimuth;
K sampling is carried out to the interference plus noise signals that virtual array exports, if the interference plus noise vector that the virtual array of kth time sampling acquisition exports is y v(k), the interference plus noise utilizing this virtual array to export vector y vk () is estimated the interference-plus-noise covariance matrix that virtual array exports, obtain the valuation of the interference-plus-noise covariance matrix that virtual array exports wherein 1≤k≤K;
Utilize the guiding vector of virtual array with the valuation of the interference-plus-noise covariance matrix that virtual array exports obtain the adaptive weight w of Subarray mixing MIMO-phased array system;
Utilize adaptive weight w to be weighted the interference plus noise signals that the virtual array of Subarray mixing MIMO-phase array exports, and then realize the adaptive interference mitigation of Subarray mixing MIMO-phased array system.
The disturbance restraining method of adaptive weighted Subarray mixing MIMO-phased array system of the present invention, can suppress interference adaptively, and the Signal to Interference plus Noise Ratio that system is exported reaches maximum at the receiving terminal of Subarray mixing MIMO-phase array.
Accompanying drawing explanation
Fig. 1 is the Subarray partition figure of array in Subarray mixing MIMO-phased array system;
Fig. 2 is the structural representation of receiving terminal in Subarray mixing MIMO-phased array system;
Fig. 3 is the flow chart of the preparation method of the adaptive weight of Subarray mixing MIMO-phased array system.
Embodiment
Embodiment one: illustrate present embodiment, the disturbance restraining method of the adaptive weighted Subarray mixing MIMO-phased array system described in present embodiment with reference to Fig. 1, Fig. 2 and Fig. 3, the method is:
Set up Subarray mixing MIMO-phased array system, this system comprises launches battle array and receives battle array, and transmitting battle array is identical with the structure receiving battle array, receive battle array and comprise N number of array element, this N number of array element is divided into L submatrix, the distance of adjacent two array elements is half operation wavelength, and the interference plus noise signals of the output of each submatrix all carries out matched filtering by L matched filter, N and L is positive integer;
If the array element level guiding vector receiving battle array is the submatrix transition matrix of array is T, utilizes the submatrix transition matrix T of array and receives the array element level guiding vector of battle array obtain the guiding vector receiving battle array according to the guiding vector receiving battle array obtain the guiding vector of virtual array wherein θ represents the angle of pitch, represent azimuth;
K sampling is carried out to the interference plus noise signals that virtual array exports, if the interference plus noise vector that the virtual array of kth time sampling acquisition exports is y v(k), the interference plus noise utilizing this virtual array to export vector y vk () is estimated the interference-plus-noise covariance matrix that virtual array exports, obtain the valuation of the interference-plus-noise covariance matrix that virtual array exports wherein 1≤k≤K;
Utilize the guiding vector of virtual array with the valuation of the interference-plus-noise covariance matrix that virtual array exports obtain the adaptive weight w of Subarray mixing MIMO-phased array system;
Utilize adaptive weight w to be weighted the interference plus noise signals that the virtual array of Subarray mixing MIMO-phase array exports, and then realize the adaptive interference mitigation of Subarray mixing MIMO-phased array system.
Array in Subarray mixing MIMO-phased array system in present embodiment adopts planar phased array, receives/send out to share.If array comprises N number of array element, and array element distance is half wavelength lambda/2, array adopts subarray configuration, if array partition is L submatrix, and transmitting battle array has identical subarray configuration with reception battle array, Fig. 1 provides the Subarray partition structure of array in Subarray mixing MIMO-phased array system.In present embodiment, array and submatrix shape are arbitrary, and Fig. 1 is all that rectangle battle array is described for array and submatrix.
In the transmitting battle array of Subarray mixing MIMO-phase array, each submatrix internal emission coherent signal, works in phase array pattern; And between different submatrixs, launch orthogonal signalling, work in MIMO mode.
At the receiving terminal of Subarray mixing MIMO-phase array, apply space domain self-adapted interference mitigation technology, make directional diagram form zero at interference radiating way and fall into, thus suppress interference adaptively.Receive battle array and comprise phase shifter, for controlling beam position.(as Taylor weighting) is weighted for the sidelobe level suppressing receiving pattern to the output signal of each array element.Receive in battle array, adjacent array element forms some submatrixs (submatrix adds up to L) by submatrix comprise network.The output of each submatrix by matched filter banks, to carry out matched filtering.Owing to there being L to transmit (systems radiate end has L submatrix, and each submatrix launches orthogonal signalling), thus each matched filter banks all has L matched filter.Due to the effect of matched filter banks, system receiving terminal defines a virtual array.
For suppressing interference adaptively, the interference plus noise signals that each matched filter exports need be weighted, the interference plus noise signals that described interference plus noise signals and virtual array export, thus need L altogether 2individual adaptive weight.In present embodiment, adaptive weight adopts LCMV (Linearly Constrained Minimum Variance, linear constraint minimal variance) criterion, the Signal to Interference plus Noise Ratio that namely makes system the export ratio of the power of interference plus noise (signal with) is maximum, namely has optimum adaptive interference mitigation performance.
Embodiment two: present embodiment is described further the disturbance restraining method of the adaptive weighted Subarray mixing MIMO-phased array system described in embodiment one, in present embodiment, the array element level guiding vector receiving battle array is preparation method be:
If the 1st array element is positioned at the origin of coordinates, i.e. reference array element in reception battle array, the coordinate of the n-th array element is (xn, yn), wherein n=1 ..., N, order the projection of unit vector in x direction in direction the projection of unit vector in y direction in direction if the phase shift value of the n-th array element for:
In formula, λ is operation wavelength, then the array element level guiding vector receiving battle array is:
The scope of said n is 1≤n≤N.
In present embodiment, receive the array element level guiding vector of battle array be a N dimensional vector, in formula trepresent transposition.
Embodiment three: present embodiment is described further the disturbance restraining method of the adaptive weighted Subarray mixing MIMO-phased array system described in embodiment one, in present embodiment, obtains the guiding vector receiving battle array according to following formula
In present embodiment, the submatrix transition matrix T of array is that N × L ties up matrix, reflects the characteristic of submatrix, is jointly determined by the phase shift of subarray configuration and each array element and amplitude weighting value.Receive the guiding vector of battle array for L dimensional vector.
Embodiment four: present embodiment is described further the disturbance restraining method of the adaptive weighted Subarray mixing MIMO-phased array system described in embodiment one, in present embodiment, obtains the guiding vector of virtual array according to following formula
In formula, q=[1,1 ..., 1] t l × 1be a L dimensional vector, each element value is 1, represent that Kronecker amasss.
In present embodiment, due to q=[1,1 ..., 1] t l × 1be a L dimensional vector, and represent Kronecker long-pending (tensor product), thus a L 2the column vector of dimension.
Embodiment five: present embodiment is described further the disturbance restraining method of the adaptive weighted Subarray mixing MIMO-phased array system described in embodiment one, in present embodiment, the interference plus noise vector that the virtual array of acquisition exports is y vk the method for () is:
If the interference plus noise vector that the interference plus noise that all array element exports is formed is y elek (), utilizes interference plus noise vector y elethe interference plus noise vector that k submatrix that () obtains exports is y (k)=T hy ele(k), wherein (1≤k≤K);
If the unit function res of each matched filter is respectively h 1(k), h 2(k) ..., h lk (), wherein the unit function res of l matched filter is h l(k):
h l ( k ) = f l * ( k 0 - k )
Wherein, 1≤l≤L, f lk () is for launching transmitting of battle array l submatrix, k 0for constant and be positive integer, *represent and get conjugation;
If the output signal of l submatrix is y in reception battle array lk (), then by the output y after l matched filter v_ll(k) be:
y V_ll(k)＝h l(k)οy l(k)
By the interference plus noise vector y of secondary for the kth virtual array output obtained of sampling vk () represents, ο represents convolution algorithm.
The secondary matched filter obtained of sampling of kth exports the signal y of (namely virtual array exports) v_llk () has L 2individual, 1≤l≤L, 1≤l≤L, constitutes the interference plus noise vector y that virtual array exports v(k).
In present embodiment, the output signal of each submatrix is all by a matched filter banks, and as shown in Figure 2, the output signal of matched filter is the output of virtual array, and the output of each submatrix is all by L matched filter.
Due to total N number of array element, therefore y elek () is a N dimensional vector, y (k) is a L dimensional vector.
Above-mentioned interference plus noise vector is y elethe interference plus noise vector that k interference plus noise value that the secondary corresponding array element of sampling of () and kth exports is formed.
Embodiment six: present embodiment is described further the disturbance restraining method of the adaptive weighted Subarray mixing MIMO-phased array system described in embodiment one, in present embodiment, following formula is utilized to obtain the valuation of the interference-plus-noise covariance matrix that virtual array exports
R ^ V = 1 K Σ k = 1 K y V ( k ) y V H ( k ) .
In present embodiment, K sampling is carried out to reception data, utilize the y obtained that samples for each time vk (), estimates the interference-plus-noise covariance matrix that virtual array exports, obtain k is hits, hrepresent conjugate transpose, thus be a L 2× L 2the square formation of dimension.
Embodiment seven: present embodiment is described further the disturbance restraining method of the adaptive weighted Subarray mixing MIMO-phased array system described in embodiment one, in present embodiment, following formula is utilized to obtain the adaptive weight w of Subarray mixing MIMO-phased array system:
Wherein, μ is constant, if the beam position of array is then for virtual array is at the guiding vector at beam position place.
The optimum adaptive weight of Subarray is a L 2the column vector of dimension, it obtains based on LCMV criterion; Virtual array is at the guiding vector at beam position place also be L 2the column vector of dimension.

Claims (7)

1. the disturbance restraining method of adaptive weighted Subarray mixing MIMO-phased array system, it is characterized in that, the method is:
Set up Subarray mixing MIMO-phased array system, this system comprises launches battle array and receives battle array, and transmitting battle array is identical with the structure receiving battle array, receive battle array and comprise N number of array element, this N number of array element is divided into L submatrix, the distance of adjacent two array elements is half operation wavelength, and the interference plus noise signals of the output of each submatrix all carries out matched filtering by L matched filter, N and L is positive integer;
If the array element level guiding vector receiving battle array is the submatrix transition matrix of array is T, utilizes the submatrix transition matrix T of array and receives the array element level guiding vector of battle array obtain the guiding vector receiving battle array according to the guiding vector receiving battle array obtain the guiding vector of virtual array wherein θ represents the angle of pitch, represent azimuth;
K sampling is carried out to the interference plus noise signals that virtual array exports, if the interference plus noise vector that the virtual array of kth time sampling acquisition exports is y v(k), the interference plus noise utilizing this virtual array to export vector y vk () is estimated the interference-plus-noise covariance matrix that virtual array exports, obtain the valuation of the interference-plus-noise covariance matrix that virtual array exports wherein 1≤k≤K;
Utilize the guiding vector of virtual array with the valuation of the interference-plus-noise covariance matrix that virtual array exports obtain the adaptive weight w of Subarray mixing MIMO-phased array system;
Utilize adaptive weight w to be weighted the interference plus noise signals that the virtual array of Subarray mixing MIMO-phase array exports, and then realize the adaptive interference mitigation of Subarray mixing MIMO-phased array system.
2. the disturbance restraining method of adaptive weighted Subarray mixing MIMO-phased array system according to claim 1, is characterized in that, the array element level guiding vector receiving battle array is preparation method be:
If the 1st array element is positioned at the origin of coordinates, i.e. reference array element in reception battle array, the coordinate of the n-th array element is (x n, y n), wherein n=1 ..., N, order the projection of unit vector in x direction in direction the projection of unit vector in y direction in direction if the phase shift value of the n-th array element for:
In formula, λ is operation wavelength, then the array element level guiding vector receiving battle array is:
The scope of said n is 1≤n≤N.
3. the disturbance restraining method of adaptive weighted Subarray mixing MIMO-phased array system according to claim 1, is characterized in that, obtains the guiding vector receiving battle array according to following formula
4. the disturbance restraining method of adaptive weighted Subarray mixing MIMO-phased array system according to claim 1, is characterized in that, obtains the guiding vector of virtual array according to following formula
In formula, q=[1,1 ..., 1] t l × 1be a L dimensional vector, each element value is 1, represent that Kronecker amasss.
5. the disturbance restraining method of adaptive weighted Subarray mixing MIMO-phased array system according to claim 1, is characterized in that, the interference plus noise vector that the virtual array of acquisition exports is y vk the method for () is:
If the interference plus noise vector that the interference plus noise that all array element exports is formed is y elek (), utilizes interference plus noise vector y elethe interference plus noise vector that k submatrix that () obtains exports is y (k)=T hy ele(k), wherein 1≤k≤K;
If the unit function res of each matched filter is respectively h 1(k), h 2(k) ..., h lk (), wherein the unit function res of l matched filter is h l(k):
h l(k)＝f l *(k 0-k)
Wherein, 1≤l≤L, f lk () is for launching transmitting of battle array l submatrix, k 0for constant and be positive integer, *represent and get conjugation;
If the output signal of l submatrix is y in reception battle array lk (), then by the output y after l matched filter v_ll(k) be:
y V_ll(k)＝h l(k)оy l(k)
By the interference plus noise vector y of secondary for the kth virtual array output obtained of sampling vk () represents, o represents convolution algorithm.
6. the disturbance restraining method of adaptive weighted Subarray mixing MIMO-phased array system according to claim 1, is characterized in that, utilizes following formula to obtain the valuation of the interference-plus-noise covariance matrix that virtual array exports
R ^ V = 1 K Σ k = 1 K y V ( k ) y V H ( k )
Wherein, hrepresent conjugate transpose.
7. the disturbance restraining method of adaptive weighted Subarray mixing MIMO-phased array system according to claim 1, is characterized in that, utilizes following formula to obtain the adaptive weight w of Subarray mixing MIMO-phased array system:
Wherein, μ is constant, if the beam position of array is then for virtual array is at the guiding vector at beam position place.
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