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Method for computing flicker indexes on basis of Beidou navigation

A technology of scintillation index and calculation method, which is applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve problems such as poor anti-interference ability, poor equipment reliability, and unsatisfactory use, and achieve scientific architecture design and satisfy use Precision, algorithm advanced effect

Inactive Publication Date: 2018-05-04
JIANGSU PROVINCE SURVEYING & MAPPING ENG INST +1
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Problems solved by technology

[0004] At present, the existing ionospheric scintillation monitoring equipment adopts temperature compensated crystal oscillator (TCXO), which often produces noise that cannot be filtered out by the low-pass filter. This kind of ionospheric scintillation monitoring equipment has poor anti-interference ability, and most of them are the simplest circuit design
In the process of use, it is mainly to obtain data, the reliability of the equipment is poor, the network communication cannot be guaranteed, the equipment cannot be remotely debugged, and it cannot meet the use in complex environments

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  • Method for computing flicker indexes on basis of Beidou navigation
  • Method for computing flicker indexes on basis of Beidou navigation
  • Method for computing flicker indexes on basis of Beidou navigation

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Embodiment Construction

[0066] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0067] Such as figure 1 As shown, in ionospheric scintillation monitoring, according to formula (1) through the amplitude scintillation index S4 T and the phase scintillation index σφ characterize the ionospheric scintillation index,

[0068] r(t)=A 0 ·δA·C(t-τ)D(t-τ)cos(ωt+φ 0 +δφ)+n(t) (1)

[0069] Among them, A 0 is the signal amplitude, C(t) is the spreading code, D(t) is the message sequence, ω is the carrier frequency, φ 0 is the initial phase, n(t) is the noise, δA and δφ are the amplitude and phase fluctuations caused by ionospheric scintillation, respectively. The calculation method of amplitude scintillation index S4 is as follows:

[0070] The amplitude scintillation index (S4 index) is usually calculated as a value per minute and is defined as the standard deviation of the signal strength normalized to the mean of t...

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Abstract

The invention discloses a method for computing flicker indexes on the basis of Beidou navigation. The flicker indexes are measured by amplitude flicker indexes S4T and phase flicker indexes sigma phiduring ionized layer flicker monitoring after trend of the amplitude flicker indexes S4T and trend of the phase flicker indexes sigma phi are eliminated by means of filtering. A process for computingthe amplitude flicker indexes S4T after the trend of the amplitude flicker indexes S4T is eliminated by means of filtering includes steps of A-1), computing signal strength SI; A-2), filtering the signal strength SI to obtain signal strength SI'; A-3), eliminating the tread by means of filtering to obtain the amplitude flicker indexes S4T. A process for computing the phase flicker indexes sigma phi after the trend of the phase flicker indexes sigma phi is eliminated by means of filtering includes steps of B-1), computing carrier phases phi after the trend is eliminated by means of filtering; B-2), acquiring the phase flicker indexes sigma phi. The method has the advantages that information of the signal strength SI and the carrier phases phi of satellite signals can be directly outputted,ionized layer flicker conditions can be computed by the aid of the information, and the method is convenient, simple, stable and reliable as compared with original equipment.

Description

technical field [0001] The invention belongs to the technical field of Beidou satellite monitoring and ionospheric monitoring, in particular to a method for calculating scintillation index based on Beidou navigation. Background technique [0002] When radio signals transmitted by satellites pass through the ionosphere, the irregular structure of the ionosphere will cause rapid and random fluctuations in signal strength and phase. This phenomenon is called ionospheric scintillation. Ionospheric scintillation often causes bit errors and signal distortions in signals received by ground receivers, thus affecting the reliability and accuracy of navigation and communication systems. Therefore, the observation and study of ionospheric scintillation is not only an important means to study the irregular structure and changing characteristics of the global ionosphere, but also becomes a problem that people pay attention to as the global navigation and communication systems rely more a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 徐地保王勇柯福阳王新志薛峥王明明
Owner JIANGSU PROVINCE SURVEYING & MAPPING ENG INST
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