Method for realizing interference resistance and multipath restraint of navigation receiver with array antenna

A technology of navigation receiver and array antenna, which is applied in the direction of radio wave measurement system, satellite radio beacon positioning system, measurement device, etc., and can solve problems such as limitation of suppression ability

Active Publication Date: 2015-08-26
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

The traditional single-antenna multipath suppression technology mainly reduces the impact of multipath on the code tracking loop by shortening the lead-lag code interval in the pseudo-code delay-locked loop, or directly uses the correlation value between the received signal

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  • Method for realizing interference resistance and multipath restraint of navigation receiver with array antenna
  • Method for realizing interference resistance and multipath restraint of navigation receiver with array antenna
  • Method for realizing interference resistance and multipath restraint of navigation receiver with array antenna

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Embodiment Construction

[0060] figure 1 It is a schematic flow diagram of the principle of the technical solution of the present invention, as shown in the figure, comprising the following steps:

[0061] Step S1, using the subspace projection algorithm to achieve interference suppression, the calculation steps are

[0062] The array received data vector in the presence of interference and multipath environment can be expressed as

[0063] x(t)=As(t)+Bj(t)+n(t)

[0064] Data covariance matrix calculation

[0065] R x =E{x(t)x(t) H}

[0066] Noise Subspace Estimation

[0067]

[0068] and

[0069] lambda 1 ≥λ 2 ≥…≥λ K > lambda K+1 =...=λ M

[0070] Therefore, the subspace formed by the eigenvectors corresponding to the large K eigenvalues ​​is defined as the interference subspace U I , the subspace spanned by the eigenvectors corresponding to M-K small eigenvalues ​​is the signal-noise subspace U N . Data projection to noise subspace projection calculation

[0071] y ...

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Abstract

The invention provides a method for realizing interference resistance and multipath restraint of a navigation receiver with an array antenna. According to the method, an interference resistance and multipath restraint two-stage treatment structure adopting a digital correlator as a boundary for division is provided according to the difference of the influence of interference and multipath signals to navigation receiver baseband processing; in the first-stage processing, before de-spreading, a space-time covariance matrix of array receiving data is estimated at first, and the interference resistance is realized by utilizing a subspace projection technique according to the characteristic that the interference signal power is far greater than navigation signal power and noise power; in the second-stage processing, before de-spreading, the spatial smooth de-correlation treatment is carried out at first, then, a generalized sidelobe cancellation technology based on Householder transformation is utilized to carry out beam formation to realize the multipath restraint. Theoretical analyses and simulation results show that the cascade treatment technology can effectively suppress strong interference, and remarkably reduce the influence of the multipath signals to navigation receiver pseudo code measurement.

Description

technical field [0001] The present invention relates to the field of terminal equipment development, specifically a method for improving the anti-interference performance and tracking accuracy of navigation terminal equipment, which can be used in the development of satellite navigation system receiving terminals using array antennas and other equipment. 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 t...

Claims

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Application Information

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IPC IPC(8): G01S19/21G01S19/22G01S19/30
CPCG01S19/21G01S19/22G01S19/30
Inventor 聂俊伟关刚强黄仰博王飞雪王东会吴鹏牟卫华雍玲李蓬蓬
Owner NAT UNIV OF DEFENSE TECH
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