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Robust beam forming method based on constraint of direction of arrival of satellite signal

A satellite signal and angle of arrival technology, applied in satellite radio beacon positioning systems, radio wave measurement systems, measurement devices and other directions, can solve the problems of inaccurate subspace, constraints of desired signals, and easy distortion of reception of desired signals, and achieve simplification The effect of the algorithm

Active Publication Date: 2014-12-10
HARBIN ENG UNIV
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Problems solved by technology

When the signal-to-noise ratio is relatively low, such methods are prone to signal subspace exchange, and the obtained subspace orthogonal to the interference signal is not accurate enough
The existing robust methods are all developed on the basis of the above two types of methods, but the above methods mainly consider the suppression of the interference signal, without constraining the desired signal, so the desired signal is easily distorted and received

Method used

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  • Robust beam forming method based on constraint of direction of arrival of satellite signal
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  • Robust beam forming method based on constraint of direction of arrival of satellite signal

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Embodiment Construction

[0026] Such as figure 1 As shown, the robust beamforming method based on satellite signal angle of arrival constraint of the present invention comprises the following steps:

[0027] Step 1: Establish an array antenna receiving signal model, and calculate the steering vectors of satellite signals and interference signals;

[0028] 1) The array antenna receives satellite signals, interference signals and space white noise, and establishes the array antenna receiving signal model

[0029] Suppose there are M antenna array elements, and the interval between adjacent array elements is λ / 2, where λ is the wavelength of the GPS signal. Assume that the arrival angles of the desired signal and the interference signal are θ 0 and θ k (k=1, 2,...P), then the received signal of the array antenna can be expressed as

[0030] x ( t ) = a ( θ 0 ...

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Abstract

The invention relates to a robust beam forming method based on the constraint of the direction of arrival of a satellite signal. The method includes the steps of 1, establishing an array antenna signal-receiving model and calculating steering vectors of the satellite signal and an interfering signal; 2, determining array antenna amplitude response constraint conditions according to a range of the direction of arrival of the satellite signal; 3, converting non-convex optimization constraint conditions obtained in step 2 into convex optimization constraint conditions; 4, according to noise power, determining a diagonal loading factor Nu of a covariance matrix of a signal received by an array antenna; and 5, establishing a beam forming cost function based on angle constraint, and solving and calculating an array antenna optimal weight by a convex optimization tool to obtain a directional beam of the satellite signal and a directional null of the interfering signal.

Description

technical field [0001] The invention relates to a robust beamforming method based on the constraint of the angle of arrival of satellite signals. Background technique [0002] Because GPS signals are transmitted on well-known frequencies with well-known modulation characteristics and low signal-to-noise ratios, they are easily jammed or spoofed. The GPS signal can obtain 43dB processing gain by relying on its spread spectrum system. However, with the improvement of man-made jamming technology, satellite signals can no longer meet the needs of users only by relying on its spread spectrum system for anti-jamming. [0003] At present, because the beamforming technology based on the array antenna can suppress the interference very well in the airspace, this technology has attracted the attention of many scholars. After receiving the signal, the antenna array can flexibly control the direction of the main beam of the antenna array by introducing an adjustable weight coefficient ...

Claims

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Application Information

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IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 徐定杰李强李伟东王伟王咸鹏贺瑞刘明凯范岳张金丽迟晓彤
Owner HARBIN ENG UNIV
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