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Terrestrial magnetism diurnal variation correction method based on terrestrial magnetism matching

A geomagnetic matching and geomagnetic technology, which is applied in directions such as ground navigation to eliminate the diurnal effect of geomagnetism, reduce matching errors, and improve positioning accuracy.

Inactive Publication Date: 2014-12-10
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] ①Most studies have only briefly discussed the influence of diurnal geomagnetic variation;
Midnight average method takes the midnight average as the baseline value, but the selection of the baseline value has a large human influence factor, which is likely to bring new error sources to the matching positioning

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Embodiment Construction

[0047] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0048] This embodiment is carried out based on observation data of geomagnetic stations, FMI method and multi-dimensional feature quantity matching. Simulation of the minute values ​​of geomagnetic observation data of three geomagnetic stations (Guangzhou GZH, Lanzhou LZH and Beijing Ming Tombs BMT) distributed in different latitudes in the year of high solar activity (2005) and year of low solar activity (2009) Geomagnetic field data. The geographical locations of the three stations are shown in the table below:

[0049] Geomagnetic station

Latitude (°)

Longitude (°)

Altitude (m)

Guangzhou

23.093N

113.343E

11

Lanzhou

36.087N

103.845E

1560

Beijing Ming Tombs

40.3N

116.2E

183

[0050] Preprocessing of the measured data: The data of the selected geomagnetic statio...

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Abstract

The invention discloses a terrestrial magnetism diurnal variation correction method based on terrestrial magnetism matching. Aiming at a terrestrial magnetism diurnal variation effect in terrestrial magnetism matched navigation and positioning, the invention provides a method for correcting the terrestrial magnetism diurnal variation effect based on an FMI (Finish Meteorological Institute) method and multi-dimensional characteristic quantity matching. The method comprises the following steps of: (1) selecting terrestrial magnetism matching characteristic quantities; (2) extracting a diurnal variation of each terrestrial magnetism matching characteristic quantity from actually-measured data of the terrestrial magnetism matching characteristic quantities based on the FMI method; (3) subtracting the corresponding diurnal variations by the actually-measured data of the terrestrial magnetism matching characteristic quantities and establishing a terrestrial magnetism real-time pattern; (4) matching the terrestrial magnetism real-time pattern with a terrestrial magnetism standard pattern based on the multi-dimensional characteristic quantity matching; and (5) outputting a matching result. According to the terrestrial magnetism diurnal variation correction method based on the terrestrial magnetism matching, the terrestrial magnetism diurnal variation effect in the terrestrial magnetism matched navigation and positioning can be effectively eliminated and the terrestrial magnetism matched navigation and positioning precision can be obviously improved.

Description

technical field [0001] The invention relates to a geomagnetic diurnal variation correction method based on geomagnetic matching, and belongs to the key technical field of high-precision geomagnetic matching navigation. Background technique [0002] Geomagnetic navigation is a major research hotspot in the current international navigation field. It has many advantages such as high autonomy, concealment, no radiation, and low energy consumption. The source navigation system is easy to be detected and interfered, and has become an important means of passive navigation for concealed moving carriers. It is widely used in the fields of submarine, missile and spacecraft auxiliary navigation, showing great military value and application prospects. However, the low precision of geomagnetic matching navigation and positioning seriously restricts its engineering application in related fields. [0003] The diurnal variation of geomagnetic field is one of the important factors affecting...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C21/08
Inventor 黄朝艳邓翠婷赵华田海冬张华龙
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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