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Navigation anti-interference method based on sum-difference beam

A differential beam, navigation satellite technology, applied in the field of anti-jamming, can solve the problem of satellite signals affecting the normal navigation work of the system, etc., to achieve the effects of increasing power, improving signal-to-noise ratio, and improving the level of signal-to-noise ratio of output signals

Active Publication Date: 2016-02-03
成都电科慧安科技有限公司
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Problems solved by technology

[0005] The technical scheme adopted by the present invention to solve the above-mentioned technical problems is to provide a method to enhance the useful signal strength and improve the output signal-to-noise ratio in view of the problem that the normal navigation operation of the system is affected due to the extremely weak satellite signal in the existing anti-interference method. navigation anti-jamming method

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  • Navigation anti-interference method based on sum-difference beam
  • Navigation anti-interference method based on sum-difference beam
  • Navigation anti-interference method based on sum-difference beam

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Embodiment Construction

[0013] In the present invention, the navigation satellite is exactly the target satellite that needs to point to. The form of the front-end array antenna of the navigation anti-jamming system can be arbitrary, such as uniform circular array, linear array, etc. The embodiment takes a four-element antenna array as an example. For four array elements, the degree of freedom in the space domain of the anti-jamming system is 3. At the same time, the anti-jamming algorithm adopts space-time two-dimensional joint processing, which can suppress interference signals in the frequency domain and the air domain. , so the system can suppress interference signals from three directions at most, and the interference signal form can be single-frequency interference or broadband interference.

[0014] The differential beam navigation anti-jamming method of the anti-jamming system is as follows:

[0015] a. Solve the steering vector according to the position information of the navigation satelli...

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Abstract

The invention provides a navigation anti-interference method based on a sum-difference beam. The position information of a navigation satellite is used to construct an orientation vector. The orientation vector is used to carry out sum-difference processing on an array antenna receiving signal, so that an array direction pattern points at a satellite signal direction. Signals synthesized by the beam come into a DLMS algorithm module for space-time two-dimensional self-adaptive filtering. Due to the fact that an array antenna points at the position of a navigation satellite signal, a useful satellite signal is not lost. Without the loss of the useful signal, an interference signal is suppressed. The signal to noise ratio level of an output signal after self-adaptive filtering can be significantly improved.

Description

technical field [0001] The invention relates to anti-jamming technology, in particular to satellite navigation anti-jamming technology. Background technique [0002] In the existing navigation system, navigation signals are easily interfered by external signals, whether it is intentional interference or environmental noise interference, the existence of interference signals will reduce the effect of the original high-precision and stable navigation signals, and even Complete failure, which is a fatal blow to some equipment that is very necessary for navigation information, such as aircraft, so the anti-jamming of navigation signals has been widely used in military and civilian fields. In the military, it can resist the enemy's artificial signal interference and play an important role in precision guidance; in the civilian field, it can be used to stabilize satellite communications for passenger aircraft. [0003] The simple and classic solution to anti-interference is adapt...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 李朝海王雨张臣勇黄长富
Owner 成都电科慧安科技有限公司