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Navigation receiver STAP algorithm through which subspace projection is performed before beam forming

A navigation receiver and beamforming technology, applied in radio wave measurement system, satellite radio beacon positioning system, measurement device, etc., can solve the problem of low navigation signal power, and achieve the effect of improving stability and tracking accuracy

Active Publication Date: 2015-04-22
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

The MMSE criterion minimizes the mean square error between the array output and the reference signal by adjusting the weights. Since the power of the received navigation signal is generally very low, the MMSE criterion will not achieve a good interference suppression effect under normal circumstances, and the MMSE criterion requires known reference signal

Method used

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  • Navigation receiver STAP algorithm through which subspace projection is performed before beam forming
  • Navigation receiver STAP algorithm through which subspace projection is performed before beam forming
  • Navigation receiver STAP algorithm through which subspace projection is performed before beam forming

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Embodiment Construction

[0045] The present invention provides a specific embodiment of a navigation receiver STAP algorithm that first subspaces projection and then beamsynthesizes. First, SVD decomposition is performed on the received data covariance matrix, and the eigenvectors corresponding to the large eigenvalues ​​form an interference subspace, and the small eigenvalues ​​correspond to The eigenvectors form the noise subspace, project the received data vector to the noise subspace to achieve interference suppression, and then use the local pseudocode of the navigation signal as a reference signal to perform beamforming on the array weights, so that the main beam of the array antenna points to the navigation signal. wave direction. Such as figure 1 shown, including the following steps:

[0046] Step S1, using the subspace projection algorithm to achieve interference suppression, the calculation steps are

[0047] The array receives the data vector as

[0048] x(k)=[x 0 (k) T ,x 1 (k-T 0 )...

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Abstract

The invention discloses a navigation receiver STAP algorithm through which subspace projection is performed before beam forming. Firstly, SVD is performed on a received data covariance matrix, characteristic vectors corresponding to large characteristic values form an interference subspace, characteristic vectors corresponding to small characteristic values form a noise subspace, received data vectors are projected to the noise subspace so that interference suppression can be formed, and then, local pseudo codes of navigation signals are used as reference signals for performing beam forming on array weight so that a main beam of an array antenna can point to the incoming wave direction of the navigation signals. The navigation receiver STAP algorithm through which subspace projection is performed before beam forming has the advantages of increasing the array output signal interference and noise ratio and improving signal tracking precision.

Description

technical field [0001] The invention relates to the field of terminal equipment development, in particular to a method for improving the anti-interference performance and tracking accuracy of navigation terminal equipment, which can be used in receiving terminals of satellite navigation systems using array antennas and the like. Background technique [0002] Array antennas have incomparable advantages over traditional antennas. For example, they can obtain high spatial diversity gain, and more importantly, they can effectively realize spatial filtering, and can greatly increase the amount of spatial information acquisition, providing space signal detection and estimation. Strong support. Digital beamforming technology is to use the antenna array to use the method of digital signal processing to make the best reception of the space signal. It has the ability to align the maximum gain direction of the antenna array beam with the desired signal, zero trapping to the interferenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/24G01S19/21
CPCG01S19/21G01S19/243
Inventor 关刚强陈华明聂俊伟王飞雪李峥嵘孙广福苏映雪庞晶刘增军雍玲
Owner NAT UNIV OF DEFENSE TECH
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