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GNSS receiver multi-beam pointing anti-interference method based on subspace tracking

A receiver and subspace technology, applied in the field of satellite navigation signal anti-jamming, can solve the problems of ignoring the influence of satellite signals and only focusing on the ability to suppress interference signals

Active Publication Date: 2019-10-22
HOHAI UNIV
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Problems solved by technology

However, the existing space-time adaptive anti-jamming methods mostly focus on how to design and generate deep nulls in the direction of the jamming, and only focus on the suppression ability of the jamming signal, while ignoring the impact of the anti-jamming process on the satellite signal

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  • GNSS receiver multi-beam pointing anti-interference method based on subspace tracking
  • GNSS receiver multi-beam pointing anti-interference method based on subspace tracking
  • GNSS receiver multi-beam pointing anti-interference method based on subspace tracking

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Embodiment Construction

[0079] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0080] In this embodiment, the method of the present invention is applied to the GNSS system, such as figure 1 As shown, the specific steps are as follows:

[0081] S1: Let the number of antenna array elements of the satellite navigation receiver be M, M is a natural number greater than 1, and the baseband signal received by the antenna array of the satellite navigation receiver at time n is denoted as x(n), then we have

[0082]

[0083] Among them, T s is the sampling interval; L is the number of satellite signal sources; for the lth satellite, s l (n),c l and τ l (n) are their corresponding satellite effective signals, C / A codes and signal delays respectively; a(θ l ) is the steering vector of the lth satellite, θ l is its direction of arrival angle parameter; K is the number of interference sources; J k (n) is the interference sig...

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Abstract

The invention discloses a GNSS receiver multi-beam pointing anti-interference method based on subspace tracking. The noise subspace tracking technique is applied to eliminate the high interference signal, and then the correlation between the multi-channel periodically delayed signal and the satellite navigation signal is applied and the DOA estimation method based on the Clean idea is applied to estimate the steering vector of each satellite navigation signal. Finally, the steering vector is utilized to construct the beamforming weight vector matrix for each satellite to enhance the directionof satellite signal. Thee transmitted navigation symbol and the satellite orientation do not need to be known and the method is a blind adaptive algorithm which can effectively improve the signal-to-interference-noise ratio of the navigation signal while suppressing the complex interference signal and can improve the receiving ability of the system to the satellite navigation signal under the complex environment to a certain extent.

Description

technical field [0001] The invention belongs to the field of anti-jamming of satellite navigation signals, and relates to technical content of self-adaptive blind beam forming anti-jamming for satellite navigation receivers, in particular to a multi-beam pointing anti-jamming method for GNSS receivers based on subspace tracking. Background technique [0002] Navigation satellites generally work tens of thousands of kilometers above the ground, and the signal received by the ground receiver is quite weak, usually submerged in the thermal noise of the receiver. Therefore, when the receiver is affected by various unintentional and intentional radio frequency interference, the satellite signal cannot be extracted from the noise, which eventually leads to a decrease in positioning accuracy or a loss of lock in the tracking loop, and sometimes even fails to work properly. The power of satellite navigation signal is very weak, and it is extremely susceptible to interference, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 高文昀殷兴辉王新君沈明威李娜沈磊
Owner HOHAI UNIV
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