Anti-transfer deceptive jamming method based on Relax algorithm

A deceptive jamming and forwarding technology, applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., to solve problems such as single, inability to solve results, and rejection of signals

Inactive Publication Date: 2015-04-22
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that when aggregated interference and distributed interference coexist, when the residual of RAIM solution is used for anti-interference calculation, when the interference occupies the main body, the correct result cannot be calculated, and the real one may be rejected. In the signal and multi-antenna technology, a single interference source is mainly aimed at. When there are multiple interference sources, only the largest one can be detected and suppressed. An anti-repeat deception interference method based on the Relax algorithm is proposed.

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  • Anti-transfer deceptive jamming method based on Relax algorithm
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  • Anti-transfer deceptive jamming method based on Relax algorithm

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specific Embodiment approach 1

[0029] Specific embodiment one: a kind of anti-transfer deception interference method based on the Relax algorithm of the present embodiment is specifically prepared according to the following steps: Step 1, according to the iterative formula of the Relax algorithm, calculate the DOA and the amplitude of N GPS signals value where n=1,2...N; is the amplitude value of the detected nth GPS signal K at the moment; is the DOA estimate of the nth signal detected;

[0030] Step 2. According to the object we observe, it is the amplitude value of the signal detected by the Relax algorithm Calculate the threshold V of the GPS signal T , and sets the absolute threshold V ab , the setting of the absolute threshold is to solve the situation that the detected GPS signals are all interference signals;

[0031] Step 3, obtained according to Step 1 Calculate the amplitude observation z of the GPS signal n :

[0032] z n = ...

specific Embodiment approach 2

[0046] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in step one, according to the iterative formula of Relax algorithm, calculate the DOA and the amplitude value of N GPS signals The specific process is:

[0047] A, setting N is the number of the GPS signal detected by the Relax algorithm, M is the number of elements of the array antenna receiving the GPS signal, K is the instant number of snapshots, and x (k) represents the receiving matrix of the GPS signal at k moments, then The receiving matrix of GPS signals at K moments is X=[x(1)x(2)...x(K)], and the iterative formula of the established Relax algorithm is as follows:

[0048] x n ( k ) = x ( k ) - Σ i = 1 , i ...

specific Embodiment approach 3

[0057] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in step two, the object we observe is the amplitude value of the signal detected by the Relax algorithm Calculate the threshold V of the GPS signal T The specific process is:

[0058] The distribution of the amplitude value of the signal detected by the Relax algorithm is generally considered to be a Rayleigh distribution; now we make two assumptions H 0 : The detected signal is a real GPS signal; H 1 : The detected signal is a deceptive interference signal, then the false alarm probability is:

[0059] P f = ∫ V T ∞ u σ s 2 e - u 2 / ...

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Abstract

The invention discloses an anti-transfer deceptive jamming method based on a Relax algorithm and relates to an anti-transfer deceptive jamming method. In order to solve the problems that a true signal is possibly refused because an accurate result cannot be resolved when polymerized jamming and distributed jamming coexist, anti-jamming resolution is carried out by virtue of an RAIM resolving remnant and jamming occupies a main body, and a multi-antenna technology mainly aims at a single jamming source, so that only the maximum jamming can be detected and inhibited when a plurality of jamming sources are provided, the invention provides the anti-transfer deceptive jamming method based on the Relax algorithm. The method is realized through the following steps of 1, obtaining N GPS signals; 2, calculating the thresholds VT and absolute thresholds Vab of the GPS signals; 3, calculating the amplitude observed values and average power observed values of the GPS signals; 4, carrying out jamming detection; and 5, obtaining non-jamming signals. The anti-transfer deceptive jamming method is applied to the field of anti-transfer deceptive jamming.

Description

technical field [0001] The invention relates to an anti-repeat deception interference method, in particular to an anti-repeat deception interference method based on a Relax algorithm. Background technique [0002] Satellite navigation and positioning system is widely used by virtue of its high-precision positioning, timing technical advantages and all-weather, real-time, continuous and passive navigation and positioning working characteristics. Due to the low power of satellite signals, the satellite navigation system is susceptible to various forms of intentional or unintentional interference, resulting in a decline in the receiver's navigation and positioning performance, or even malfunctioning. There are two main interference mechanisms for satellite navigation system receivers: suppressive interference and deceptive interference. The strong signal suppressing interference is easy to be detected by the enemy and suppressed by the adaptive zeroing antenna, and the interfe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 韩帅张宇孟维晓
Owner HARBIN INST OF TECH
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