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Digital multi-beam forming method based on multi-domain combination

A digital multi-beam and beam technology, applied in the field of signal processing, can solve problems such as inability to locate useful signals and limited anti-interference ability, and achieve the effect of reducing hardware operation requirements, avoiding division operations, and avoiding implementation complexity.

Pending Publication Date: 2022-05-13
CHENGDUSCEON TECH
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AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the main lobe of the antenna pattern cannot be aligned with the direction of the satellite signal, the useful signal cannot be positioned, and the anti-interference ability is limited. The purpose is to provide a digital multi-domain The beamforming method uses the space-time two-dimensional domain for joint anti-jamming, forms nulls in the direction of interference, and at the same time forms protection upwards for useful signals, so as to achieve the purpose of suppressing interference and improving the signal-to-noise ratio of useful signals

Method used

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  • Digital multi-beam forming method based on multi-domain combination
  • Digital multi-beam forming method based on multi-domain combination
  • Digital multi-beam forming method based on multi-domain combination

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Embodiment 1

[0051] Such as figure 1As shown, this embodiment provides a multi-domain joint-based digital multi-beamforming method, which is characterized in that it includes the following steps:

[0052] S1. Obtain a sampled signal, perform an orthogonal transformation on the sampled signal, perform broadband correction on the sampled signal after the orthogonal transformation, and perform space-time conversion on the sampled signal after the broadband correction to obtain a space-time signal;

[0053] S2. Calculating the sampling covariance matrix of the space-time signal;

[0054] S3. Calculate the airspace steering vector according to the direction information of the signal, and perform time domain delay on the airspace steering vector to obtain the space-time constraint vector;

[0055] S4. Calculate the weight of the optimal beamformer according to the result of calculating the sampling covariance matrix of the space-time signal and the space-time constraint vector;

[0056] S5. Fi...

Embodiment 2

[0079] Such as figure 2 As shown, set the frequency of the transmitted signal as the center frequency of the incident signal, and open the signal modulation mode. You can choose the modulation mode such as BPSK or QPSK, and the bandwidth parameter is consistent with the bandwidth parameter of the useful signal. Set the transmitting antenna and the receiving antenna on the same straight line, that is, q=0°, at this time, the distance from the transmitting signal to each array element is the same.

[0080] M array antennas have M channels of AD sampling signals, and the sampling signals are all intermediate frequency samples. Therefore, it is necessary to perform orthogonal transformation on the AD sampling signals to obtain I and Q signals with phase and amplitude information.

[0081] Such as image 3 As shown, broadband correction is performed on the sampling signal, and the AD sampling data of a certain array element is used as a reference signal, and the matrix inversion ...

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Abstract

The invention discloses a digital multi-beam forming method based on multi-domain combination, and the method comprises the steps: carrying out the combined anti-interference through employing a multi-domain combination digital multi-beam technology, carrying out the combined anti-interference through a space-time two-dimensional domain, forming a constraint vector pointing to a satellite according to the coming direction information of the satellite and array popularity, enabling a beam formed after the anti-interference to be aligned with the coming direction of the satellite, and achieving the anti-interference of the satellite. According to the invention, null is formed in an interference direction, protection can be formed in a useful signal coming direction, signal processing gain brought by an antenna array can be utilized while interference suppression is achieved, so that the signal-to-noise ratio of a satellite signal is improved, time domain compensation is carried out by adopting a broadband correction technology, in-band amplitude-phase inconsistency brought by hardware is corrected, and the signal-to-noise ratio of the satellite signal is improved. Therefore, the influence of carrier phase difference between different beams caused by the adoption of a time domain in a space-time multi-beam technology is avoided, the anti-interference performance is improved, the positioning precision of signals after multiple beams is ensured, the requirement for in-band consistency of hardware is reduced, and a space-time multi-beam algorithm is simple and feasible in engineering application.

Description

technical field [0001] The present invention relates to the technical field of signal processing, in particular to a multi-domain joint-based digital multi-beam forming method. Background technique [0002] With the increasing demand for anti-jamming antennas in the navigation field, the currently commonly used antennas for satellite navigation receivers are adaptive controllable pattern antennas, also known as adaptive zeroing antennas. At the same time as all navigation signals, it also receives all interference signals in the covered frequency band, and then uses space-time joint array anti-interference technology to suppress interference. The commonly used power inversion algorithm in engineering. The advantage of this method is that it can achieve the purpose of suppressing interference without knowing the direction information of satellite signals and the array popularity. It belongs to a blind adaptive beamforming method, which is simple to implement and has good comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 王晓洪李富生唐明徐小东佟力王璟王成赵霞
Owner CHENGDUSCEON TECH
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