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Anti-interference normal null widening method for dynamic GNSS receiver

A zero trap widening and receiver technology, applied to instruments, measuring devices, satellite radio beacon positioning systems, etc., can solve problems such as inability to ensure correct capture of satellite signals, slow update speed of adaptive weights, and data mismatch

Inactive Publication Date: 2014-12-03
WUHAN UNIV
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Problems solved by technology

However, due to the relatively slow update speed of the adaptive weights, the convergence speed of the algorithm cannot keep up with the change speed of the interference direction of arrival (DOA), making the interference easily move out of the direction pointed by the antenna null and cannot be suppressed, resulting in a certain The phenomenon of data mismatch cannot guarantee the correct capture of satellite signals by the GNSS receiver, which makes conventional airspace and spacetime domain interference suppression methods completely ineffective

Method used

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  • Anti-interference normal null widening method for dynamic GNSS receiver
  • Anti-interference normal null widening method for dynamic GNSS receiver
  • Anti-interference normal null widening method for dynamic GNSS receiver

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Embodiment

[0053] One, at first introduce two models involved in the present invention, wherein,

[0054] 1. The conventional output power minimum constraint model is as follows:

[0055] Assuming that the model is composed of M array elements, using a linear array signal model, the signal waveform it receives corresponds to M output signal vectors X(t), expressed as

[0056] X(t)=S(t)+N(t), (0≤t≤T) (1)

[0057] S(t) is recorded as the interference signal component in the received signal vector, and N(t) is recorded as the noise component. After formula (1) is discretized, the correlation matrix of the input signal is defined as

[0058] R xx = E { X ( n ) X H ( n ) } = AR ss A H + ...

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Abstract

The invention belongs to the technical field of GNSS engineering safety, and relates to an anti-interference normal null widening method for a dynamic GNSS receiver. On the basis of a normal-distribution probability model, a null widening model of the dynamic GNSS receiver is provided. The model is linearized on the situation of small angle changing, and frequency spectrum gains formed before and after widening are compared by means of a Matlab simulation tool. By means of a power insertion algorithm, the relationship of an output SNR and an input INR is analyzed before and after widening, and ultimately engineering realizability of an algorithm is put forward through FPGA and DSP platform verification. As is shown by a result, widening null formed through the widening algorithm can effectively counteract interference sources changing within a certain range, the aim of preventing dynamic interferences is achieved and robustness of a self-adaptation algorithm is improved.

Description

technical field [0001] The invention belongs to the technical field of GNSS engineering safety, is an interference suppression technology, belongs to the array antenna anti-interference technology, and specifically relates to an anti-interference normal null widening method of a dynamic GNSS receiver. The widening null formed by the widening algorithm can effectively offset the changing interference sources within a certain range, achieve the purpose of resisting dynamic interference, and improve the robustness of the adaptive algorithm. Background technique [0002] At present, the anti-jamming technology of navigation receivers is generally divided into three categories: adaptive filtering technology, array antenna anti-jamming technology and receiver signal processing technology. The present invention mainly relates to the array antenna anti-jamming technology. [0003] The zeroing technology in the array antenna anti-interference technology utilizes the characteristics o...

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Application Information

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IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 陈鲤文郑建生周琪景晗居益林徐鑫刚
Owner WUHAN UNIV
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